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Artykuły w czasopismach na temat "Dynamic pressure sensor"
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Tian, Bian, Yulong Zhao, Zhe Niu i Jiang Zhuangde. "Micro-pressure sensor dynamic performance analysis". Sensor Review 34, nr 4 (26.08.2014): 367–73. http://dx.doi.org/10.1108/sr-11-2013-748.
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Purpose – The purpose of this paper is to report on a piezoresistive pressure sensor for micro-pressure measurement with a cross-beam membrane (CBM) structure. This study analyzes the dynamic characteristics of the proposed device. Design/methodology/approach – This CBM sensor possesses high stiffness and sensitivity, measuring dynamic pressure more effectively in a high-frequency environment compared with other piezoresistive structures. The dynamic characteristics are derived using the finite element method to analyze the dynamic responses of the new structure, including natural frequency and lateral effect performances. The CBM dynamic performances are compared with traditional structures. Findings – The pressure sensor performance was evaluated, and the experimental results indicate that they all exhibit similar dynamic characteristics as the designed model. Compared with traditional structures such as the single island, the CBM proves to be superior in evaluating the dynamic performances of pressure sensors at high frequencies of > 30 kHz. Originality/value – Most studies of this micro pressure sensors attempt to promote the sensitivity or focus on the static performance of pressure sensor with micro gauge. This study is concerned with analyze the dynamic characterism of micro pressure sensor and compared with the traditional structures, that prove the CBM structure has stable dynamic performance and is a better option for measuring dynamic micro pressure in biomedical applications.
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Tsung, Tsing Tshih, Lee Long Han, Liang Chia Chen i Ho Chang. "Performance Characterization of Pressure Sensors Using an Improved Pressure Square Wave Generator". Key Engineering Materials 295-296 (październik 2005): 533–38. http://dx.doi.org/10.4028/www.scientific.net/kem.295-296.533.
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The purpose of this paper is to analyze and compare the dynamic characteristics of various structure pressure sensors using the Improved Pressure Square Wave Generator (IPSWG). The developed IPSWG is a signal generator that creates pressure square waves as an excitation source. The dynamic characteristics of pressure sensor in hydraulic systems can be measured and evaluated effectively due to the high excitation energy. The method is also useful for dynamic testing and characterization for a high frequency range, which cannot be performed by the traditional methods, such as the hammer kit excitation, sweeping frequency pressure wave, and random frequency wave. Result shows that piezoelectric sensors (quartz) have a largest gain margin and overshoot. The strain gauge sensor has a smaller gain margin and overshoot. The piezoelectric sensor is more suitable for measuring dynamic pressure.
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Okojie, Robert S., Roger D. Meredith, Clarence T. Chang i Ender Savrun. "High Temperature Dynamic Pressure Measurements Using Silicon Carbide Pressure Sensors". Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2014, HITEC (1.01.2014): 000047–52. http://dx.doi.org/10.4071/hitec-ta25.
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Un-cooled, MEMS-based silicon carbide (SiC) static pressure sensors were used for the first time to measure pressure perturbations at temperatures as high as 600 °C during laboratory characterization, and subsequently evaluated in a combustor rig operated under various engine conditions to extract the frequencies that are associated with thermoacoustic instabilities. One SiC sensor was placed directly in the flow stream of the combustor rig while a benchmark commercial water-cooled piezoceramic dynamic pressure transducer was co-located axially but kept some distance away from the hot flow stream. In the combustor rig test, the SiC sensor detected thermoacoustic instabilities across a range of engine operating conditions, amplitude magnitude as low as 0.5 psi at 585 °C, in good agreement with the benchmark piezoceramic sensor. The SiC sensor experienced low signal to noise ratio at higher temperature, primarily due to the fact that it was a static sensor with low sensitivity.
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Gao, Rui, Wenjun Zhang, Junmin Jing, Zhiwei Liao, Zhou Zhao, Bin Yao, Huiyu Zhang i in. "Design, Fabrication, and Dynamic Environmental Test of a Piezoresistive Pressure Sensor". Micromachines 13, nr 7 (19.07.2022): 1142. http://dx.doi.org/10.3390/mi13071142.
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Microelectromechanical system (MEMS) pressure sensors have a wide range of applications based on the advantages of mature technology and easy integration. Among them, piezoresistive sensors have attracted great attention with the advantage of simple back-end processing circuits. However, less research has been reported on the performance of piezoresistive pressure sensors in dynamic environments, especially considering the vibrations and shocks frequently encountered during the application of the sensors. To address these issues, this paper proposes a design method for a MEMS piezoresistive pressure sensor, and the fabricated sensor is evaluated in a series of systematic dynamic environmental adaptability tests. After testing, the output sensitivity of the sensor chip was 9.21 mV∙bar−1, while the nonlinearity was 0.069% FSS. The sensor overreacts to rapidly changing pressure environments and can withstand acceleration shocks of up to 20× g. In addition, the sensor is capable of providing normal output over the vibration frequency range of 0–5000 Hz with a temperature coefficient sensitivity of −0.30% FSS °C−1 over the temperature range of 0–80 °C. Our proposed sensor can play a key role in applications with wide pressure ranges, high-frequency vibrations, and high acceleration shocks, as well as guide MEMS-based pressure sensors in high pressure ranges and complex environmental adaptability in their design.
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Cai, Sikang, Guicong Wang, Yingjun Li i Xiaoqi Yang. "Research on material selection of force-sensitive element for high-frequency dynamic piezoelectric pressure sensor". MATEC Web of Conferences 355 (2022): 01026. http://dx.doi.org/10.1051/matecconf/202235501026.
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The high-frequency dynamic piezoelectric pressure sensor has the advantages of simple structure, long service life, high natural frequency, excellent signal-to-noise ratio and great sensitivity. It is appropriate for measuring high dynamic, dynamic or quasi-static pressure changes and pressure fluctuations. And this kind of sensor is widely utilized in the shock wave testing. The force-sensitive element is one of the main factors affecting the static and dynamic performance of piezoelectric pressure sensors. Basing on the piezoelectric equation and coupling effect between mechanics and electricity, in this paper, the finite element model of the high-frequency dynamic piezoelectric pressure sensor is established. The influences of the force-sensing element on the sensitivity of the sensor are analysed. Referential suggestions for choosing force-sensitive element of high-frequency dynamic piezoelectric pressure sensor are provided.
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Geng, Xingguang, Su Liu, Yitao Zhang, Shaolong Zhang, Jiena Hou, Jun Zhang, Muhammad Asif i Hai-Ying Zhang. "Adjacent Channel Interference Modeling of Single Vibration Point on Multichannel Dynamic Pressure Sensors". Journal of Sensors 2020 (12.02.2020): 1–8. http://dx.doi.org/10.1155/2020/1953506.
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Pulse waves of a radial artery under different pressures applied through a cuff play an important role in disease diagnosis, especially in traditional chinese medicine (TCM). Pulse waves could be collected by a pressure sensor array affixed to an inflatable cuff. During a process of collecting pulse waves, one sensor of a sensor array moves up and down when the sensor is shocked by a pulse wave. Movement of the sensor leads to the passive displacement of other nearby sensors because of a connecting structure between them. Then, vibration signals will be generated by the nearby sensors although these sensors do not receive radial artery pulse waves. These vibration signals considered an interference are usually superimposed on real signals obtained from these nearby sensors and degrade signal quality. The problem mentioned above does not only generally exist in a pressure sensor array attached to a wristband but also is easy to ignore. This paper proposes a novel interference suppression algorithm based on Welch’s method for estimating and weakening adjacent sensor channel interference to overcome the problem. At first, a sensor array attached to an inflatable cuff and a vibration generator is proposed to establish an experimental platform for simplifying the pulse wave collection process. Then, the interference suppression algorithm is proposed according to mechanical analysis and Welch’s method based on the proposed sensor array and vibration generator. Next anti-interference abilities of the algorithm based on a simplified process are evaluated by different vibration frequencies and applied pressures. The anti-interference abilities of the algorithm based on pulse waves of the radial artery are evaluated indirectly. The results show that the novel interference suppression algorithm could weaken adjacent sensor channel interference and upgrade the signal quality.
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Szczerba, Zygmunt, Piotr Szczerba, Kamil Szczerba i Krzysztof Pytel. "Acceleration-Insensitive Pressure Sensor for Aerodynamic Analysis". Energies 16, nr 7 (27.03.2023): 3040. http://dx.doi.org/10.3390/en16073040.
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This paper presents a method for preparing a pressure sensor that is insensitive to acceleration along with experimental evidence of its efficacy in aerodynamic analysis. A literature review and preliminary studies revealed the undesirable effect of acceleration on sensors that are located on moving elements, as evidenced by deviations from actual pressure values for piezoresistive pressure sensors that are made using MEMS technology. To address this, the authors developed a double-membrane sensor geometry that eliminated this imperfection; a method of implementing two solo pressure sensors as a new geometry-designed sensor was also proposed. Experimental tests of this suggested solution were conducted; these measurements are presented here. The results indicated that this new sensor concept could be used to measure the dynamic pressures of rotating and moving objects in order to obtain measurement results that are more reliable and closer to the true values that are derived from aerodynamic analyses. The published results confirm the reliability of the proposed device.
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Zhang, Jun Xiang, Kun Shan Ge, Zhan Bao Gao i Shao Peng Dong. "Online Dynamic Compensation of Pressure Sensor". Applied Mechanics and Materials 775 (lipiec 2015): 420–25. http://dx.doi.org/10.4028/www.scientific.net/amm.775.420.
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An online dynamic compensation of the pressure sensor based on simultaneous identification method of model order and parameter is proposed to identify the model of pressure sensor and set digital compensation links for the pressure sensor. While simulating, the compensation links can broaden the frequency band and improve the dynamic process of the pressure sensor. This article describes the realization of the digital dynamic compensation with DSP processor and the process of the experimental verification. The results show that the simultaneous identification method can be used in determination of model and digital compensation links for pressure sensor effectively. And DSP measurement device can complete online dynamic compensation effectively.
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Svete, Andrej, Francisco Javier Hernández Castro i Jože Kutin. "Effect of the Dynamic Response of a Side-Wall Pressure Measurement System on Determining the Pressure Step Signal in a Shock Tube Using a Time-of-Flight Method". Sensors 22, nr 6 (9.03.2022): 2103. http://dx.doi.org/10.3390/s22062103.
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Technological progress demands accurate measurements of rapidly changing pressures. This, in turn, requires the use of dynamically calibrated pressure meters. The shock tube enables the dynamic characterization by applying an almost ideal pressure step change to the pressure sensor under calibration. This paper evaluates the effect of the dynamic response of a side-wall pressure measurement system on the detection of shock wave passage times over the side-wall pressure sensors installed along the shock tube. Furthermore, it evaluates this effect on the reference pressure step signal determined at the end-wall of the driven section using a time-of-flight method. To determine the errors in the detection of the shock front passage times over the centers of the side-wall sensors, a physical model for simulating the dynamic response of the complete measurement chain to the passage of the shock wave was developed. Due to the fact that the use of the physical model requires information about the effective diameter of the pressure sensor, special attention was paid to determining the effective diameter of the side-wall pressure sensors installed along the shock tube. The results show that the relative systematic errors in the pressure step amplitude at the end-wall of the shock tube due to the errors in the detection of the shock front passage times over the side-wall pressure sensors are less than 0.0003%. On the other hand, the systematic errors in the phase lag of the end-wall pressure signal in the calibration frequency range appropriate for high-frequency dynamic pressure applications are up to a few tens of degrees. Since the target phase measurement uncertainty of the pressure sensors used in high-frequency dynamic pressure applications is only a few degrees, the corrections for the systematic errors in the detection of the shock front passage times over the side-wall pressure sensors with the use of the developed physical dynamic model are, therefore, necessary when performing dynamic calibrations of pressure sensors with a shock tube.
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Gobi, K., B. Kannapiran, D. Devaraj i K. Valarmathi. "Design, performance evaluation and analysis of the inlet tube of pressure sensor for chamber pressure measurement". Sensor Review 39, nr 4 (15.07.2019): 612–21. http://dx.doi.org/10.1108/sr-12-2017-0260.
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Purpose In Aerospace applications, the inlet tubes are used to mount strain gauge type pressure sensors on the engine under static test to measure engine chamber pressure. This paper aims to focus on the limitations of the inlet tube and its design aspects to serve better in the static test environment. The different sizes of the inlet tubes are designed to meet the static test and safety requirements. This paper presents the performance evaluation of the designed inlet tubes with calibration results and the selection criteria of the inlet tube to measure combustion chamber pressure with the specified accuracy during static testing of engines. Design/methodology/approach Two sensors, specifically, one cavity type pressure sensor with the inlet tube of range 0-6.89 MPa having natural frequency of the diaphragm 17 KHz and another flush diaphragm type pressure sensor of the same range having −3 dB frequency response, 5 KHz are mounted on the same pressure port of the engine under static test to study the shortcomings of the inlet tube. The limitations of the inlet tube have been analyzed to aid the tube design. The different sizes of inlet tubes are designed, fabricated and tested to study the effect of the inlet tube on the performance of the pressure sensor. The dynamic calibration is used for this purpose. The dynamic parameters of the sensor with the designed tubes are calculated and analyzed to meet the static test requirements. The diaphragm temperature test is conducted on the representative hardware of pressure sensor with and without inlet tube to analyze the effect of the inlet tube against the temperature error. The inlet tube design is validated through the static test to gain confidence on measurement. Findings The cavity type pressure sensor failed to capture the pressure peak, whereas the flush diaphragm type pressure sensor captured the pressure peak of the engine under a static test. From the static test data and dynamic calibration results, the bandwidth of cavity type sensor with tube is much lower than the required bandwidth (five times the bandwidth of the measurand), and hence, the cavity type sensor did not capture the pressure peak data. The dynamic calibration results of the pressure sensor with and without an inlet tube show that the reduction of the bandwidth of the pressure sensor is mainly due to the inlet tube. From the analysis of dynamic calibration results of the sensor with the designed inlet tubes of different sizes, it is shown that the bandwidth of the pressure sensor decreases as the tube length increases. The bandwidth of the pressure sensor with tube increases as the tube inner diameter increases. The tube with a larger diameter leads to a mounting problem. The inlet tube of dimensions 6 × 4 × 50 mm is selected as it helps to overcome the mounting problem with the required bandwidth. From the static test data acquired using the pressure sensor with the selected inlet tube, it is shown that the selected tube aids the sensor to measure the pressure peak accurately. The designed inlet tube limits the diaphragm temperature within the compensated temperature of the sensor for 5.2 s from the firing of the engine. Originality/value Most studies of pressure sensor focus on the design of a sensor to measure static and slow varying pressure, but not on the transient pressure measurement and the design of the inlet tube. This paper presents the limitations of the inlet tube against the bandwidth requirement and recommends dynamic calibration of the sensor to evaluate the bandwidth of the sensor with the inlet tube. In this paper, the design aspects of the inlet tube and its effect on the bandwidth of the pressure sensor and the temperature error of the measured pressure values are presented with experimental results. The calibration results of the inlet tubes with different configurations are analyzed to select the best geometry of the tube and the selected tube is validated in the static test environment.
Rozprawy doktorskie na temat "Dynamic pressure sensor"
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Xu, Juncheng. "High Temperature High Bandwidth Fiber Optic Pressure Sensors". Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/25988.
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Pressure measurements are required in various industrial applications, including extremely harsh environments such as turbine engines, power plants and material-processing systems. Conventional sensors are often difficult to apply due to the high temperatures, highly corrosive agents or electromagnetic interference (EMI) noise that may be present in those environments. Fiber optic pressure sensors have been developed for years and proved themselves successfully in such harsh environments. Especially, diaphragm based fiber optic pressure sensors have been shown to possess advantages of high sensitivity, wide bandwidth, high operation temperature, immunity to EMI, lightweight and long life.
Static and dynamic pressure measurements at various locations of a gas turbine engine are highly desirable to improve its operation and reliability. However, the operating environment, in which temperatures may exceed 600 °C and pressures may reach 100 psi (690 kPa) with about 1 psi (6.9kPa) variation, is a great challenge to currently available sensors. To meet these requirements, a novel type of fiber optic engine pressure sensor has been developed. This pressure sensor functions as a diaphragm based extrinsic Fabry-Pérot interferometric sensor. One of the unique features of this sensor is the all silica structure, allowing a much higher operating temperature to be achieved with an extremely low temperature dependence. In addition, the flexible nature of the sensor design such as wide sensitivity selection, and passive or adaptive temperature compensation, makes the sensor suitable for a variety of applications
An automatically controlled CO2 laser-based sensor fabrication system was developed and implemented. Several novel bonding methods were proposed and investigated to improve the sensor mechanical ruggedness and reduce its temperature dependence.
An engine sensor testing system was designed and instrumented. The system generates known static and dynamic pressures in a temperature-controlled environment, which was used to calibrate the sensor.
Several sensor signal demodulation schemes were used for different testing purposes including a white-light interferometry system, a tunable laser based component test system (CTS), and a self-calibrated interferometric-intensity based (SCIIB) system. All of these sensor systems are immune to light source power fluctuations, which offer high reliability and stability.
The fiber optic pressure sensor was tested in a F-109 turbofan engine. The testing results prove the sensor performance and the packaging ruggedization. Preliminary laboratory and field test results have shown great potential to meet not only the needs for reliable and precise pressure measurement of turbine engines but also for any other pressure measurements especially requiring high bandwidth and high temperature capability.Ph. D.
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Jones, Sarah. "The application of enhanced fluid dynamic gauging as a fouling sensor for pressure driven membrane separations in the food industry". Thesis, University of Bath, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557823.
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The aim of this study was to further understand the fouling and cleaning mechanisms of synthetic membranes used to filter an industrially relevant feed. The main focus of this study was to understand the fouling layer properties during pressure driven filtration. A relatively new technique known as Fluid Dynamic Gauging (FDG) was applied to examine the fouling layer thickness. This work comprised of four main themes with overlapping objectives: (i) the optimisation of Spent Sulphite Liquor fouling and cleaning conditions, (ii) the optimisation of molasses fouling and cleaning conditions, (iii) the investigation of the effect of a simple pre-treatment upon the membrane separation performance, and (iv) the application of the FDG in the study of polymeric membranes. An understanding of the mechanisms involved in fouling and cleaning of microfiltration and ultrafiltration membranes used to filter molasses and SSL has been attained. The variables affecting permeate flux and quality were optimised and mechanistic information concerning the synergistic effects between fouling and cleaning was gathered. The application of a simple NaOH pre-treatment was found to affect both the type of foulant species attaching to the membrane surface, and resulted in an altered separation and cleaning performance. Zeta potential measurements, FTIR and AFM demonstrated that both in-pore and surface fouling was present. The data collected indicated that for both membranes evaluated, different fouling species were found to have attached, depending upon the pre-treatment protocol used. These findings are significant, as they offer support to the recommendations made by some polymeric membrane manufacturers that conditioning protocols should include a NaOH step. However, in the SSL system examined, the effect of NaOH pre-treatment resulted in an improvement in the subsequent performance only over the first two or three complete filtration cycles. It is therefore necessary to study membrane systems over multiple fouling and cleaning cycles before a recommendation can be made. An improved understanding of the interaction between the surface chemistry and surface physics during membrane filtration of complex food based material will benefit both membrane manufactures and food industry based users. The technique of Fluid Dynamic Gauging was incorporated into an existing system and validated to monitor the development of cake layers over time. The FDG was also used to optimise conditions and track the thickness of the cake layer during multiple fouling cycles and its removal rate during cleaning, as an aid to understanding removal mechanisms. It has been shown that operating conditions have to be carefully chosen to minimise the effect of membrane fouling. The results show that FDG is a versatile and powerful technique for characterising the dynamics and mechanical behaviour of fouling layers on membrane surfaces. A particular advantage of the FDG technique is its ability to determine the thickness of fouling layers where other techniques would find difficulty. For example, the layers formed in this study were opaque, and consequently the determination of the development of deposit thickness with time would have been very challenging using conventional optical microscopy techniques.
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Ruhweza, Mugisha Macbeth. "Development of a Mechanical System to Dynamically Calibrate Pressure Sensors using a Vibrating Liquid Column". Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62134.
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This report describes a simple mechanical system developed for producing dynamic pressures of up to 50 kPa from zero-to-peak and over the frequency range 0-58 Hz. The system is constructed for dynamic calibration of pressure sensors and consists of an open tube, 30 cm in height, mounted vertically on the support plate. The support plate is connected to the vibration exciter which is driven by a piston, a connecting rod, disc and axle, and an electric motor. The pressure sensor to be calibrated is mounted vertically at the bottom of the open tube so that the diaphragm of the sensor is in contact with the working liquid in the tube. When the system is started, the motion of the piston provides a sinusoidal movement to the open tube and calibration is achieved. The different parts of the system are designed using NX Siemens. MatLab is used to determine the results and graphs from the equations derived. The analysis shows that the displacement, velocity, and acceleration of the system are highly affected by the distance between the disc centre and the disc pin, and the rotational speed of the system. The length of the connecting rod does not affect the displacement and barely affects the velocity and acceleration of the system. The total force, torque, and power of the system is utilized to select the electric motor and the frequency inverter.Denna rapport beskriver ett enkelt mekaniskt system som utvecklas för att producera dynamiska tryck upp till 50 kPa från noll-till-topp och över frekvensområdet 0-58 Hz. Systemet är konstruerat för dynamisk kalibrering av trycksensor och består av öppet rör 30 cm höjd monteras vertikalt på stödplattan. Stödplattan är ansluten till vibrationsexcite dvs, den yttre cylindern som drivs av en kolv, en vevstake, skiva och axel och en elmotor. Trycksensorn som skall kalibreras är monterad vertikalt vid botten av det öppna röret så att membranet hos sensorn är i kontakt med arbetsvätskan i röret. När systemet startas, ger rörelsen hos kolven som ger vibrationer till det öppna röret och kalibrering uppnås. De olika delarna av systemet är utformade med hjälp av NX Siemens. MatLab används för att bestämma resultaten och diagram härledda från ekvationerna. Analysen visar att den förskjutning, hastighet och acceleration av systemet är i hög grad påverkade av avståndet mellan skivans centrum och skivtappen, och rotationshastigheten hos systemet. Längdn av vevstaken påverkar inte försjutningen och påverkar knappt hastigheten och accelerationen hos systemet. Den totala kraften, vridmomentet och kraften i systemet användes för attvälja de andra komponenterna i systemet dvs, den elektriska motorn och frekvensomvandlaren.
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Mori, Hideo, Tomohide Niimi, Madoka Hirako i Hiroyuki Uenishi. "Pressure Sensitive Paint Suitable to High Knudsen Number Regime". IOP, 2006. http://hdl.handle.net/2237/6960.
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Larson-Robl, Kylie M. "PORE PRESSURE MEASUREMENT INSTRUMENTATION RESPONSE TO BLASTING". UKnowledge, 2016. http://uknowledge.uky.edu/mng_etds/30.
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Coal mine impoundment failures have been well documented to occur due to an increase in excess pore pressure from sustained monotonic loads. Very few failures have ever occurred from dynamic loading events, such as earthquakes, and research has been done regarding the stability of these impoundment structures under such natural seismic loading events. To date no failures or damage have been reported from dynamic loading events caused by near-by production blasting, however little research has been done considering these conditions. Taking into account that current environmental restrictions oblige to increase the capacity of coal impoundments, thus increasing the hazard of such structures, it is necessary to evaluate the effects of near-by blasting on the stability of the impoundment structures. To study the behavior of excess pore pressure under blasting conditions, scaled simulations of blasting events were set inside a controlled sand tank. Simulated blasts were duplicated in both saturated and unsaturated conditions. Explosive charges were detonated within the sand tank at various distances to simulate different scaled distances. Information was collected from geophones for dry and saturated scenarios and additionally from pressure sensors under saturated conditions to assess the behavior of the material under blasting conditions.
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DUVET, LUDOVIC. "Instrumentation pour l'etude in-situ des atmospheres neutres et ionises planetaires et cometaires : idm (ion dynamics monitor) et cops (comet pressure sensor)". Paris 6, 2001. http://www.theses.fr/2001PA066296.
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Le travail realise durant cette these a consiste en le developpement, la realisation et les tests de deux instruments destines a l'etude des environnements neutres et ionises planetaires et cometaires. Le premier instrument, idm (ion dynamics monitor), est un spectrometre a plasma thermique et suprathermique (< 200 ev) developpe initialement lors de la phase de consolidation du projet cometaire europeen rosetta. Une version amelioree a ensuite ete adaptee pour l'etude de l'ionosphere et de la couche limite de mars dans le cadre du projet dynamo. Les deux versions du spectrometre ont ete testees en laboratoire et les resultats, en tres bon accord avec la simulation, ont montre le respect des specifications necessaires a la mesure. Le second instrument est destine a la mesure des parametres dynamiques d'une atmosphere neutre. Une etude detaillee des techniques de mesures actuelles de la dynamique d'un gaz neutre est tout d'abord presentee et montre l'interet de l'utilisation d'un concept instrumental reposant sur des jauges de densite a impact electronique et des chambres d'equilibre. L'instrument cops (comet pressure sensor), premiere realisation de ce concept, sera embarque a bord de la sonde rosetta et permettra l'evaluation de la vitesse d'expansion et de la densite du gaz cometaire. Le developpement de l'instrument a necessite la mise au point de techniques de modelisation de l'interaction d'un gaz et d'un solide en regime moleculaire et a conduit a la realisation de tests sous faisceau moleculaire. Les resultats montrent que les principaux objectifs sont atteints. Une seconde application de ce concept instrumental destinee a l'etude de la haute atmosphere martienne est aussi presentee.
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Thomsen, Maiken. "Perception de l'arôme du fromage à pâte pressée non cuite". Thesis, Dijon, 2012. http://www.theses.fr/2012DIJOS120.
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La perception de la flaveur des aliments dépend de la perception de plusieurs composés en mélange dans des proportions équilibrées. Interactions perceptives entre différents odorants ainsi que la libération dynamique des odorants par la matrice alimentaire sont les principaux facteurs qui influencent la perception globale. L’objectif de cette thèse de doctorat était d’étudier la perception du mélange d’odorants qui constituent l’arôme du fromage à pâte pressée, en prenant en compte les interactions perceptives et la dynamique de libération des composés par la matrice. Une stratégie, comprenant une caractérisation complète des odorants des fromages, suivie d’une recombinaison qualitative et d’une étude détaillée des rôles respectifs des composés clés, et finalement la prise en compte de la dynamique de libération par incorporation des composés dans une matrice fromagère, a été appliquée. Des caractérisations approfondies sensorielles et instrumentales nous ont permis de mettre en évidence des relations entre la perception sensorielle et la composition des composés volatils et proposer des hypothèses. La recombinaison des différents composés a été testée afin d’étudier le rôle de chacun en mélange. Aidés par des apprentis aromaticiens durant la phase des recombinaisons nous avons pu observer particulièrement que 12 composés étaient très importants pour l’odeur du fromage. Par la suite nous avons étudié des interactions entre odeurs en appliquant des techniques de stimulation odorante en phase gazeuse, puis la dynamique de libération des composés en incorporant l’arôme dans une matrice fromagère par des techniques permettant de mesurer la quantité libérée en fonction du tempsPerception of the aroma of food products depends both the chemical composition of food and human neurophysiology. The perception of food flavour, including cheese often relies on the perception of several aroma compounds in mixture in balanced proportions. Perceptual interactions among aroma compounds in mixtures and also the release of aroma compounds from the food product are the main factors that influence the global perceived aroma of food. Hence, the objective of this PhD study was to investigate the mixture of aroma compounds representing the aroma of semi-hard cheese by taking into account perceptual interactions among odorants and the dynamic release of the compounds by the cheese matrix. A strategy involving a complete characterisation of the cheeses followed by a recombination and investigation of the role of the key-aroma compounds and the dynamic release of the aroma compounds from the cheese matrix was taken into account. Comparison of the sensory and instrumental characteristics was made in order to highlight relationships between sensory perception of the aroma and the volatile composition of the cheeses and thus point out the molecular origins of the perceived cheese aroma. Recombination of selected aroma compounds was tested, in order to study the role of each aroma compound within the mixture. Especially 12 compounds seemed important for the semi-hard cheese aroma. To investigate the odour-odour interactions, different odour-stimulation tools were applied and dynamic release of aroma compounds was taken into account by incorporating the aroma compounds into a cheese matrix by different techniques allowing measuring the quantities released as function of time
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Veley, Emma Michelle. "Measurement of Unsteady Characteristics of Endwall Vortices Using Surface-Mounted Hot-Film Sensors". Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1534450563500249.
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Lin, Guan-Chen, i 林冠辰. "STRUCTURE DESIGN, DYNAMIC TESTING AND ANALYSIS ON THE MICRO PIEZOELECTRIC PRESSURE SENSOR". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/73023592567697696681.
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碩士國立中興大學
精密工程學系所
102
In this paper reports a novel full-range vacuum sensing device, capable of exceeding the sensing range of most gauges and reducing the volume by a factor of 10. The device gauges the free decay rate of a micro-cantilever beam which provides uniform in-plane stress across the surface of the beam, and a thick square plate connected to the trapezoid beam deflected using Piezoelectric Thin-Film Pb(Zr,Ti)O3(PZT) used to determine the free decay rate of the sensing beam with respect to deflection force and vacuum pressure. In the beginning,the paddle cantilever vibrated by the piezoelectric actuators, and then the decay rate of the deflected beam in vacuum environment was measured by piezoelectric sensor. We found that the free decay rate of the deflected beam is linearly proportional to the vacuum pressure. This rapid response in pressure ranges demonstrates that the device has high degree of sensitivity. The proposed device represents a considerable advancement in the development of miniature full-range pressure gauges as well as the applicability of micro-electromechanical systems.
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Ferreira, Armando José Barros. "Development of a pressure sensor network system for static and dynamic pressure measurements: application to the limb/prosthesis pressure mapping". Doctoral thesis, 2014. http://hdl.handle.net/1822/35850.
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Tese de doutoramento em Ciências - FísicaThe present work relates to the development of a sensors network for mapping the pressure fields at the externa! prosthesis socket/stump interface, in particular at lower limbs. The project consists on the design and implementation of a sensor array from piezoresistive polymer based materiais to measure quasi-static and dynamic deformations. The sensors were prepared from poly(vinylidene fluoride) - PVDF and epoxy nanocomposites with carbon nanotubes or nanofibres. The development of thin film-based stretchable electrodes was carried out using the GLancing Angle Deposition, GLAD, technique. A specific electronic circuit for signal processing was used with a wireless data acquisition system. Finally, a prototype was designed , constructed and tested in four IO\.ver limb amputees, in laboratory conditions , under different types of solicitations at the Vocational Rehabilitation Center - CRPG (Centro de Reabilitação Profissional de Vila Nova de Gaia). The piezoresistive-based sensors were developed using two different approaches; a) nanocomposites composed of poly(vinylidene~ fluoride) filled with carbon nanotubes (CNT/PVDF); and b) epoxy resins filled with carbon nanotubes or nanofibres (CNT/EPOXY). The PVDF samples were prepared by hot pressing and spray printing with CNT sample concentrations up to loadings of 1 O wt.%. The phase present in the composites CNT/PVDF was the alfa-phase. Due to the fact that externa! limb prostheses must sustain cyclic loading and unloading during normal walking conditions, the correlation between the electrical resisitivity and mechanical solicitations was obtained for differents mechanical solicitations, including variations in deformation , temperature and velocity. ln relation to CNT/EPOXY, the electrical response is linear over a wide strain range and the values of the maximum gauge factor is ~2 . 8 . The stability of the signal over 32 cycles, the time response to deformatoins from 0.1 to 50 mm min- 1 and the stable temperature behaviour up to 60 °C shows the viability of these materiais to be used as piezoresistive sensors. ln the sarne way, the electrical and piezoresistive response of CNT/PVDF composites has been studied. The piezoresistive response, quantitatively analysed by the gauge factor, is maximized at concentrations around the percolation threshold, around 2 wt.% loading, and the maximum value of the gauge factor is ~6.2. The piezoresistive response is stable with the number of cycles and reversible up to temperatures below 100 °C. The linearity of the response over a wide strain range shows the viability of these materiais to be used as piezoresistive sensors. The development of stretchable electrodes was carried out using columnar Ti-Ag thin films with a Ag content of 8 at.% prepared by D.C. magnetron sputtering on CNT/PVDF piezoresistive composites. The Ti-Ag system was chosen to coat the polymers due to some important points related to its characteristics. First of ali, Ti-Ag thin films combine the excellent biocompatibility of Ti with the Ag antimicrobial properties, offering also good thermal, electrical , chemical and mechanical properties, together with good wear and corrosion resistance. Secondly, the addition of Ag was also thought in order to tailor the elasticity of the Ti films, allowing a better response of the coated polymer under any particular deformation or stretching of the composite sensor when in-service. Additionally, the deposition of the films by GLancing Angel Deposition , GLAD, instead of conventional Magnetron Sputtering Deposition , MSD, was also carried to allow and even extend this elasticity resistance. ln fact, by depositing films with some particular architectures , inclined, zigzag, etc., there is a real possibility to deposit thin films with extended capacities to resist to stretching or any common deformation that a polymeric-based sensor induce when in-service. Furthermore, there is also the possibility to improve the electrical response of the system and this, ali together, to improve the response and the adequacy of the ali sensor arrangement in this particular type of applications . By changing the typical columnar growth microstructure, obtained by conventional sputtering, the goal was to tune the mechanical and electrical responses of the materiais. Upon uniaxial stretching of the prepared zigzag thin films, the resistance of the thin film starts increasing smoothly for strains up to 3%. Above 10% strain a sharp increase of the electrical resistance is observed due to film mechanical failure and therefore interruption of the electrical conductivity pathways. The best results were obtained when the polymer was coated with intermediate incident angles (a = 60°). The results show that the electrodes structure has a pronounced influence on the overall sensor response leading to values of the GF up to 85 mainly due to the electromechanical contribution of the thin film, which stability has to be studied for potential use for sensor applications itself. Human study was conducted at the Vocational Rehabilitation Center- CRPG (Centro de Reabilitação Profissional de Vila Nova de Gaia). The subjects transfemoral (TF) and transtibial (TI) amputees , walked for 2 minutes in a crosswalk at a relatively comfortable speed of 0.33 m/s. During this time it was possible to simulate a normal walk of approximately 40 m and the results provided good indications that it is possible to identify areas of criticai pressure. Thus, it is expected that the present method will become helpful for comprehensively evaluating the biomechanical conditions of the residual limb and prosthesis interface. The system developed in this project may allow monitoring of the process of rehabilitation with a new prosthesis and will support clinical decisions in relation to the potential effects of modifications on the socket, when adjustments are required.
O presente trabalho descreve o desenvolvimento de uma matriz de sensores para mapear as pressão exercidas em próteses externas dos membros inferiores, na interface coto/prótese, baseados em materiais piezoresistivos para medir as deformações dinâmicas e quasi-estáticas . Os sensores foram preparados a partir de nanocompósitos de poli(fluoreto de vinilideno) - PVDF e resinas epoxy com nanotubos- CNT ou nanofibras- CNF de carbono. Adicionalmente, foram desenvolvidos elétrodos estiráveis baseados em filmes finos através da técnica de pulverização catódica GLAD, Glancing Angle Deposition. O circuito electrónico usado para o processamento de sinal foi desenvolvido com um sistema de aquisição de dados sem fios. Finalmente, foi construído um protótipo que foi testado em quatro pacientes amputados dos membros inferiores em condições de laboratório, sob diferentes tipos de solicitações no centro de reabilitação vocacional - CRPG (Centro de Reabilitação Profissional de Vila Nova de Gaia). Com base no efeito piezoresistivo , os sensores foram obtidos usando duas diferentes ... abordagens; a) compósitos de poli(fluoreto de vinilideno) com nanotubos de carbono (CNT/PVDF); e b) compósitos de resinas epóxi com nanotubos de carbono ou nanofibras (CNT/epóxi). As amostras de PVDF foram preparadas por prensagem a quente e/ou por spray com concentrações de CNT até 10 % em peso. A fase cristalina presente nos compósitos CNT/PVDF foi a fase alfa-PVDF. Foi obtida a correlação entre a resistividade elétrica e as diferentes solicitações mecânicas, através da deformação , da variação da temperatura, da velocidade e do tempo de resposta do compósito. Em relação aos compósitos de CNT/epóxi, obteve-se uma resposta elétrica linear e os valores de sensibilidade máxima (gauge factor) foram de ~ 2.8. Através das diferentes solicitações mecânicas , a estabilidade do sinal para mais de 32 ciclos, o tempo de resposta para deformações de 0.1 a 50 mm min· 1 e a estabilidade com a temperatura até 60 oc mostram a viabilidade destes materiais para serem utilizados como sensores piezoresistivos. Da mesma forma , a resposta elétrica e piezoresistiva dos compósitos de CNT/PVDF foi estudada. A resposta piezoresisitiva foi quantitativamente analisada pela sensibilidade do material (gauge factor) e verificou-se que é máxima para concentrações em tomo do limiar de percolação, ~2 % de CNT em peso, e o valor máximo obtido foi de ~ 6.2. A resposta piezoresistiva é estável em função do número de ciclos e reversível até temperaturas inferiores a 100 °C. A linearidade da resposta com a deformação mostra a viabilidade destes materiais para serem utilizados como sensores piezoresistivos. O desenvolvimento de elétrodos estiráveis foi realizado usando filmes finos com estrutura colunar de titânio e prata - Ti-Ag com um teor de Ag de 8 at.% preparados por pulverização catódica em compósitos piezoresistivos de CNT/PVDF. O sistema Ti-Ag foi escolhido para revestir os polímeros devido a alguns pontos importantes relacionados com as suas características. Primeiro de tudo , filmes finos de Ti-Ag combinam a excelente biocompatibilidade do titânio com as propriedades anti-microbianas da prata, oferecendo deste modo boas propriedades químicas, mecânicas e elétricas, juntamente com boas propriedades de resistência ao desgaste e corrosão. Segundo, a adição de prata também foi incluída com o objetivo de promover a elasticidade do filme de modo a permitir uma melhor adaptação do filme ao polímero. Por outro lado, o sistema GLAD teve por grande objetivo este mesmo propósito: melhorar a resposta elétrica e a elasticidade do sistema de modo a permitir uma melhor adequação à deposição dos elétrodos em materiais flexíveis. A técnica de GLAD foi usada para alterar a microestrutura típica de crescimento colunar obtida por pulverização catódica convencional , Magnetron Sputtering Deposition, MSD, em diferentes arquiteturas de crescimento , tais como colunas inclinadas e em ziguezague, a fim de ajustar as respostas meéânicas e elétricas dos materiais. Após estiramento uniaxial dos filmes finos em ziguezague, a resistência eléctrica do filme fino começa a aumentar tenuemente para tensões até 3%. Acima de 10% de estiramento dá-se um aumento acentuado da resistência eléctrica que é observado devido à falha mecânica do filme . Os melhores resultados foram obtidos quando o polímero foi revestido com filmes depositados com ângulos incidentes intermédios (a = 60 °). Os resultados mostram que a estrutura dos elétrodos tem uma acentuada influência sobre a resposta global do sensor levando a valores de sensibilidade até 85. Esta contribuição deve-se essencialmente à contribuição eletromecânica do filme fino. O estudo com Pacientes foi realizado no centro de reabilitação profissional- CRPG (Centro de Reabilitação Profissional de Gaia), com amputados transfemoral (TF) e amputados transtibial (TT), que caminharam durante 2 minutos numa passadeira eléctrica com uma velocidade relativamente confortável de 0,33 rn/s. Durante este tempo , foi possível simular uma marcha normal de aproximadamente 40m. Deste modo demonstrou-se que é possível identificar as áreas criticas de pressão. Espera-se que, o presente método, se tome útil para avaliar exaustivamente as interações biomecânicas entre o membro amputado e a prótese. O sistema desenvolvido neste projeto poderá permitir o monitoramento durante o processo de reabilitação e apoiar em decisões clínicas em relação aos potenciais efeitos e modificações do encaixe da prótese no coto .
Fundação para a Ciência e a Tecnologia (FCT) for the financial support (SFRH/BD/69796/2010).
Książki na temat "Dynamic pressure sensor"
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P, Skobelev O., i Rzevski G. 1932-, red. Pressure sensor dynamics. Samara: IBT, 1993.
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United States. Federal Motor Carrier Safety Administration. Office of Bus and Truck Standards and Operations. Commercial motor vehicle tire pressure sensors. Washington, DC: U.S. Dept of Transportation, Federal Motor Carrier Safety Administration, Office of Bus and Truck Standards and Operations, 2005.
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Grigory, Adamovsky, Floyd Bertram i NASA Glenn Research Center, red. Demodulation system for fiber optic Bragg grating dynamic pressure sensing. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.
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- i NASA Glenn Research Center, red. Pressure probe designs for dynamic pressure measurements in a supersonic flow field. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.
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J, Petersen Brian, Scott David D i United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., red. A dynamic response model for pressure sensors in continuum and high Knudsen number flows with large temperature gradients. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1996.
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Skobelev, O. P. Pressure Sensor Dynamics (Sensor Synamics). WIT Press (UK), 2001.
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Skobelev, O. P. Sensor Dynamics Volume 1: Pressure Sensor Dynamics. Wit Pr/Computational Mechanics, 1996.
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Lei, Yuan. Ventilator Monitoring. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780198784975.003.0011.
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‘Ventilator Monitoring’ describes that group of functions that enables us to understand the functional status of a ventilator system and the ventilated patient. This chapter begins by introducing general monitoring concepts, describing the operation of the flow sensors and oxygen sensors that make the measurements, which are displayed as numerical monitoring parameters, waveforms, dynamic loops, and trend curves. The chapter details common monitoring parameters for pressure, flow, volume, time, and oxygen concentration. Examples of normal and abnormal ventilator graphics are shown. Finally, the chapter details each typical monitoring parameter and gives background information about its significance.
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Mee, Sarah, i Zoe Clift. Hand Therapy. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198757689.003.0002.
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Rehabilitation is a multidisciplinary, patient-centred, evidence-based process to promote healing, restore function, and promote independence. The physical and psychological and social consequences of the hand condition or injury have to be considered. Mobilization can be active or passive, supplemented by accessory movements and proprioceptive rehabilitation. Splinting may be static, serial static, static progressive, dynamic. Many materials are available. Oedema may be acute or chronic; it is treated with elevation, active movement, retrograde massage, compression, kinesiotaping, cold therapy, and contrast bathing. Scars may be mature or immature; keloid or hypertrophic. Management is generally empiric: massage, silicone, pressure therapy, steroid injections, and surgery all have roles. Hypersensitivity (allodynia, causalgia, dysaesthesia, hyperpathia, etc.) is treated with desensitization, graded textures, percussion, and mirror visual feedback. Stiffness is managed especially by prevention; movement, splinting, and surgery have a role. Pain is treated with medication, oedema control, acupuncture, TENS, education, psychological measures. Complex Regional Pain Syndrome has sensory, vasomotor, sudomotor, and trophic elements. Treatment includes medication, hand therapy, and occasionally surgery.
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Schmidgen, Henning. Horn, or The Counterside of Media. Tłumacz Nils F. Schott. Duke University Press, 2022. http://dx.doi.org/10.1215/9781478022343.
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We regularly touch and handle media devices. At the same time, media devices such as body scanners, car seat pressure sensors, and smart phones scan and touch us. In Horn, Henning Schmidgen reflects on the bidirectional nature of touch and the ways in which surfaces constitute a site of mediation between interior and exterior. Schmidgen uses the concept of horn—whether manifested as a rhinoceros horn or a musical instrument—to stand for both natural substances and artificial objects as a space of tactility. He enters into creative dialogue with artists, scientists, and philosophers, ranging from Salvador Dalí, William Kentridge, and Rebecca Horn to Sigmund Freud, Walter Benjamin, and Marshall McLuhan, who plumb the complex interplay between tactility and technological and biological surfaces. Whether analyzing how Dalí conceived of images as tactile entities during his “rhinoceros phase” or examining the problem of tactility in Thomas Pynchon’s The Crying of Lot 49, Schmidgen reconfigures understandings of the dynamic phenomena of touch in media.
Części książek na temat "Dynamic pressure sensor"
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Erben, Andreas, Alexander Geist, Immanuel Voigt, Björn Senf, Thomas Mäder, Janine Glänzel, Steffen Ihlenfeldt i Welf-Guntram Drossel. "Smart Pressure Film Sensor for Machine Tool Optimization and Characterization of the Dynamic Pressure Field on Machine Surfaces". W Lecture Notes in Production Engineering, 179–91. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-34486-2_14.
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AbstractKnowledge of thermal interactions with the environment is essential for improving the performance of machine tools. Therefore, it is necessary to detect and quantify the convective heat flows at machine tool surfaces, that occur in the workspace as a result of cutting fluid use or outside the machine due to active air flow. Thin-film sensors made of shape memory alloys with integrated small temperature sensors are suitable for detecting very fine pressure differences and can be used to estimate convective heat transfer. By measuring the pressure differences, the dynamic pressure field at the surface can be determined. Since the pressure field correlates with the flow field, conclusions can be drawn about the flow velocity. This leads to more profound and extended possibilities to match flow fields from CFD simulations with measured data. At the same time, the surface temperature is also recorded by this sensor. Reference measurements of the temperature in the free flow are used to characterize the heat transfer. By knowing the pressures, temperatures and the correlating flow velocity near the wall, the heat transfer coefficient can be determined. Against this background, this paper demonstrates the behavior of shape memory alloys as fluid pressure sensors and addresses the development of such sensors for machine tools. For this purpose, sensor units are to be developed that can be placed as a sensor network (composite of several sensors on one surface) inside and outside the workspace.
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Li, Tao, Ying Wu i Yanxi Yu. "Research on Dynamic Pressure Sensor Based on ZigBee Technology". W Computational and Experimental Simulations in Engineering, 331–38. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-02097-1_24.
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Druţa, Paul Florin, Calin Gozman-Pop, Dorin Simoiu, Ion Crâştiu i Liviu Bereteu. "The Analysis of the Dynamic Behavior of a Tire Pressure Sensor". W New Advances in Mechanisms, Mechanical Transmissions and Robotics, 496–503. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60076-1_45.
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Culliver, Steven, Mark N. Nabarro, Bruce Milthorpe, Alberto Cimmino, William J. Cumming i Klaus Schindhelm. "Developing a Sensor for the Dynamic Measurement of Joint Pressure Distributions". W Clinical Biomechanics and Related Research, 103–12. Tokyo: Springer Japan, 1994. http://dx.doi.org/10.1007/978-4-431-66859-6_11.
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Burkhardt, O., U. G. S. Dinata i W. Nitsche. "Surface Fence with an Integrated, Piezoresistive Pressure Sensor for Measurements of Static and Dynamic Wall Shear Stress". W New Results in Numerical and Experimental Fluid Mechanics III, 411–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-540-45466-3_48.
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Yang, Fan, Chuanrong Zhao, Hongzhen Zhu i Deren Kong. "Study on Mathematical Model and Dynamic Compensation of Oil Down-Hole Pressure Sensor Based on BP Neural Network". W Conference Proceedings of 2022 2nd International Joint Conference on Energy, Electrical and Power Engineering, 374–79. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-4334-0_46.
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Chevallier, G., H. Festjens, F. Renaud i J. L. Dion. "Pressure Measurement Sensor for Jointed Structures". W Special Topics in Structural Dynamics, Volume 6, 383–88. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6546-1_41.
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Lemnitzer, Anne, Lisa Star, Lohrasb Keykhosropour, Antonio Marinucci i Steve Keowen. "Large Diameter Soil Pressure Sensors Employed in Dynamic Shallow Foundation Testing". W Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, 327–35. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0095-0_37.
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Chang, Ho, Mu Jnug Kao, Tsing Tshih Tsung i J. L. Wu. "An Innovative Technology for Measuring The Dynamic Characteristics of Pressure Sensors". W Materials Science Forum, 1057–62. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-990-3.1057.
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Foss, Gary, Jessica Meloy, Mark Valentino i Patrick Walter. "Sensors and their Signal Conditioning for Dynamic Acceleration, Force, Pressure, and Sound Applications". W Handbook of Experimental Structural Dynamics, 45–101. New York, NY: Springer New York, 2022. http://dx.doi.org/10.1007/978-1-4614-4547-0_33.
Pełny tekst źródłaStreszczenia konferencji na temat "Dynamic pressure sensor"
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Wang, Likun, Lei Qin i Li Li. "Piezoelectric dynamic pressure sensor". W 2010 International Conference on Information and Automation (ICIA). IEEE, 2010. http://dx.doi.org/10.1109/icinfa.2010.5512134.
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Ashauer, M., H. Glosch, H. Ashauer, H. Sandmaier i W. Lang. "Liquid Mass Flow Sensor Using Dynamic Pressure Detection". W ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-1279.
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Abstract We are reporting on a new application of state of the art silicon pressure sensors in measurement of volume flows. Due to small sensor dimensions and suitable device passivation, the sensor element can be placed right in the flowing medium and detect the liquid dynamic pressure. First prototypes are being evaluated by various industrial companies.
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Harpin, A. P. R. "Static and Dynamic Pressure Measurements With Temperature Correction Using High Temperature Optical Pressure Sensors". W ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22904.
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We describe our range of high temperature (1100°C) pressure sensors capable of measuring both static pressures of several Bar as required by gas turbine and jet engines, and measuring dynamic pressure fluctuations with a total dynamic range of in excess of 100000. This is achieved by a combination of rugged sensor design and our proprietary optical interrogator. This allows operation in harsh environments, EMI immunity, and simultaneous interrogation of not only static and dynamic pressure, but also the temperature of the sensor. This allows the sensor to maintain high accuracy over a wide range of operating temperatures. To date sensors have not been able to offer operation temperatures this high whilst enabling accurate dynamic pressure readings at the locations required. Also the static pressure cannot be retrieved simultaneously in real time from the same sensor. Also the temperature coefficient of the sensor has to be taken into account by measuring the temperature the sensor is operating at. Oxsensis has addressed these issues and we will present results showing dynamic pressure and temperature and explain how we can measure the temperature of the sensor with our interrogation schemes. We will describe the form of the sensor and the test data confirming its suitability for harsh environments. We will also explain the optical interrogator performance and present simulated results. The interrogator may be realised by a slave cavity or preferably on an integrated optical platform. As these sensors are intended for hostile gas turbine and aerospace environments, we will also present data from real life engine trials that we have performed, and compare the data we obtained with existing measurement techniques. Tests on a combustor rig have tested the sensor up to 1000°C, demonstrating that using our sensors in an engine at these temperatures is a realistic prospect. We believe that the ruggedness and performance of these sensors together with our complimentary interrogators mean that they are of significant interest to instrumentation of gas turbine engines and in the future the development of sophisticated engine feedback and emission control schemes, both in land based and aerospace environments.
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Gan, Jiulin, Haiwen Cai, Jianxin Geng, ZhengQing Pan, Ronghui Qu i Zujie Fang. "Optic fiber-based dynamic pressure sensor". W 2008 1st Asia-Pacific Optical Fiber Sensors Conference (APOS). IEEE, 2008. http://dx.doi.org/10.1109/apos.2008.5226318.
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Kaczmarek, Cezary, Waldemar Wojcik i Muhtar Junisbekov. "Photonic Crystal Fiber Dynamic Pressure Sensor". W 2018 XV International Scientific Conference on Optoelectronic and Electronic Sensors (COE). IEEE, 2018. http://dx.doi.org/10.1109/coe.2018.8435157.
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Ferrara, Giovanni, Lorenzo Ferrari i Gabriele Sonni. "Experimental Characterization of a Remoting System for Dynamic Pressure Sensors". W ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68733.
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Concerning measurements with dynamic pressure sensors, one of the most interesting aspects is the influence of a remoting system interposed between the sensor and the measurement point. This mounting system, once correctly characterized, allows one to use the same sensor for different measurement points, reducing the total number of sensors used. In addition, in all the applications involving high temperatures (e.g. combustion chamber), a remoting system allows the use of cheaper dynamic pressure sensors with lower operating temperature capability. A remoting system for dynamic pressure sensors made up by a remoting duct, between the sensor and the measurement point, followed by a damping duct has been characterized for different tube lengths. Tests were carried out with two kinds of sources: a diaphragm-less shock tube for the first set of tests and an acoustic speaker for the second. Results are here reported and commented.
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Durgut, Yasin, Okhan Ganioglu, Bulent Aydemir, Ahmet Turk, Recep Yilmaz, Abdullah Hamarat i Eyup Bagci. "Improvement of dynamic pressure standard for calibration of dynamic pressure transducers". W 19th International Congress of Metrology (CIM2019), redaktor Sandrine Gazal. Les Ulis, France: EDP Sciences, 2019. http://dx.doi.org/10.1051/metrology/201927009.
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In dynamic pressure measurement phenomena, dynamic pressure calibration of the measurement chain including a pressure sensor, signal conditioning amplifier and data acquisition part is required. A drop mass dynamic calibration machine which is used for the dynamic calibration in hydraulic media was designed and developed. This study presents a research study and measurement results on the dynamic calibration of pressure transducers by using the newly developed machine.
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Kober, Timo, Ingmar Stoehr, S. Sindlinger i Roland Werthschuetzky. "B4.2 - Analyzing Amplitude and Phase Response of a Differential Pressure Sensor Using a Dynamic Pressure Source". W SENSOR+TEST Conferences 2009. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2009. http://dx.doi.org/10.5162/sensor09/v1/b4.2.
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Qiu, Liqiang, Qi Chu, Tianfu Li i Yongkang Dong. "Dynamic distributed Brillouin optical fiber pressure sensor". W First Optics Frontier Conference, redaktorzy Shining Zhu, Tiejun Cui, Xiangang Luo i Long Zhang. SPIE, 2021. http://dx.doi.org/10.1117/12.2599261.
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Wu, David W., i Hwang Choe. "Effects of Sensor Shape on Oscillating Pressure Measurements With Wind-Tunnel Test Confirmation". W ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93942.
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This paper summarizes the effects of the pressure sensor shape on the dynamic oscillating pressure measurements when the pressure wave modulating along the steam/air flow path is to be characterized. In the study presented in the paper, a three-dimensional CFD model of the external flow around the protruding, dome-shaped sensor was developed to evaluate the effects of the sensor shape on the external flow pattern, and the detailed flow patterns were studied with this protruding, dome-shaped sensors and compared with the flow patterns for the flush mounted sensors. Then, a one-dimensional analysis was done to predict that the dynamic pressures measured with the protruding sensor do not require significant correction, and this was later supported by wind tunnel tests. The amplitude of the dynamic pressure measured on the protruding sensor was determined to be ranging from 0 to 8% higher than measured by a flush mounted pressure sensor. The frequency of the pressure wave is not affected by the presence of the protrusion.
Raporty organizacyjne na temat "Dynamic pressure sensor"
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Xiao, Hai, Hai-Lung Tsai i Junhang Dong. Micro-Structured Sapphire Fiber Sensors for Simultaneous Measurements of High-T and Dynamic Gas Pressure in Harsh Environments. Office of Scientific and Technical Information (OSTI), wrzesień 2014. http://dx.doi.org/10.2172/1171318.
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McKinnon, Mark, Craig Weinschenk i Daniel Madrzykowski. Modeling Gas Burner Fires in Ranch and Colonial Style Structures. UL Firefighter Safety Research Institute, czerwiec 2020. http://dx.doi.org/10.54206/102376/mwje4818.
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The test scenarios ranged from fires in the structures with no exterior ventilation to room fires with flow paths that connected the fires with remote intake and exhaust vents. In the ranch, two replicate fires were conducted for each room of origin and each ventilation condition. Rooms of fire origin included the living room, bedroom, and kitchen. In the colonial, the focus was on varying the flow paths to examine the change in fire behavior and the resulting damage. No replicates were conducted in the colonial. After each fire scene was documented, the interior finish and furnishings were replaced in affected areas of the structure. Instrumentation was installed to measure gas temperature, gas pressure, and gas movement within the structures. In addition, oxygen sensors were installed to determine when a sufficient level of oxygen was available for flaming combustion. Standard video and firefighting IR cameras were also installed inside of the structures to capture information about the fire dynamics of the experiments. Video cameras were also positioned outside of the structures to monitor the flow of smoke, flames, and air at the exterior vents. Each of the fires were started from a small flaming source. The fires were allowed to develop until they self-extinguished due to a lack of oxygen or until the fire had transitioned through flashover. The times that fires burned post-flashover varied based on the damage occurring within the structure. The goal was have patterns remaining on the ceiling, walls, and floors post-test. In total, thirteen experiments were conducted in the ranch structure and eight experiments were conducted in the colonial structure. All experiments were conducted at UL's Large Fire Laboratory in Northbrook, IL. Increasing the ventilation available to the fire, in both the ranch and the colonial, resulted in additional burn time, additional fire growth, and a larger area of fire damage within the structures. These changes are consistent with fire dynamics based assessments and were repeatable. Fire patterns within the room of origin led to the area of origin when the ventilation of the structure was considered. Fire patterns generated pre-flashover, persisted post-flashover if the ventilation points were remote from the area of origin.