Дисертації з теми "Sensor Instrumentation"
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Abhijith, N. "Semi Conducting Metal Oxide Gas Sensors: Development And Related Instrumentation." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/281.
Повний текст джерелаNewman, Jason. "A FIBER SENSOR INTEGRATED MONITOR FOR EMBEDDED INSTRUMENTATION SYSTEMS." International Foundation for Telemetering, 2006. http://hdl.handle.net/10150/604111.
Повний текст джерелаIn this paper we will present a new fiber sensor integrated monitor (FSIM) to be used in an embedded instrumentation system (EIS). The proposed system consists of a super luminescent diode (SLD) as a broadband source, a novel high speed tunable MEMS filter with built in photodetector, and an integrated microprocessor for data aggregation, processing, and transmission. As an example, the system has been calibrated with an array of surface relief fiber Bragg gratings (SR-FBG) for high speed, high temperature monitoring. The entire system was built on a single breadboard less than 50 cm² in area.
Araujo, Maria S., Myron L. Moodie, Greg C. Willden, Ryan J. Thibodeaux, and Ben A. Abbott. "Integrating Wireless Sensor Technologies into Instrumentation and Telemetry Systems." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/605939.
Повний текст джерелаRecent technological advancements in low-power, low-cost, small-footprint embedded processors, sensors, and radios are resulting in the very rapid growth of wireless sensor network deployments. Wireless sensor networks merge the scalability and distributed nature of networked systems with the size and energy constraints of remote embedded systems. With the ever increasing need to develop less intrusive, more scalable solutions for instrumentation systems, wireless sensor technologies present several benefits. They largely eliminate the need for power and network wiring, thus potentially reducing cost, weight, and deployment time; their modularity provides the flexibility to rapidly change instrumentation configurations and the capability to increase the coverage of an instrumentation system. While the benefits are exciting and varied, as with any emerging technology, many challenges need to be overcome before wireless sensor networks can be effectively and successfully deployed in instrumentation applications, including throughput, latency, power management, electromagnetic interference (EMI), and band utilization considerations. This paper describes some approaches to addressing these challenges and achieving a useful system.
Seliskar, Daniel Peter. "Capacitance-based microvolume liquid-level sensor array." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100243.
Повний текст джерелаThe sensor was tested using sodium chloride (NaCl) and ethanol solutions to simulate the range of conductivity and permittivity typical in biological and chemical research. Measured capacitance was a second-order function of liquid volume due to fringe-field effects and was compensated for by adding a hardware-based calibration. Liquid-volume measurement error averaged 0.2% of the 120mul fill volume with a standard deviation of 0.6% (< mul). The maximum absolute error for all liquids was 2.7% (3mul).
Faulstich, Raymond J., Lawrence W. Jr Burke, and William P. D’Amico. "HARDENED SUBMINIATURE TELEMETRY AND SENSOR SYSTEM." International Foundation for Telemetering, 1996. http://hdl.handle.net/10150/607637.
Повний текст джерелаThe Army development and test community must demonstrate the functionality and reliability of gun-launched projectiles and munitions systems, especially newer smart munitions. The best method to satisfy this requirement is to combine existing optical and tracking systems data with internal data measured with on-board instrumentation (i.e. spin, pitch, and yaw measurements for standard items and terminal sensor, signal processor, and guidance/navigation system monitoring for smart munitions). Acquisition of internal data is usually limited by available space, harsh launch environments, and high associated costs. A technology development and demonstration effort is underway to provide a new generation of products for use in this high-g arena. This paper describes the goals, objectives, and progress of the Hardened Subminiature Telemetry and Sensor System (HSTSS) program.
Silva, Diogo Fonte da. "SAW sensor validation and instrumentation for torque and temperature measurement." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22736.
Повний текст джерелаThe work here presented is inserted in the framework of the RTMGear Project, that has the objective of measuring several physical parameters, such as torque and temperature, directly within the rotating parts present in a power reduction gearbox. The urge of this study comes from the aircraft industry demand for systems able to perform real-time monitoring of torque in the most critical components operating inside a gearbox. However, the existing sensing technologies have limitations in terms of accuracy. There are also considerable di culties to its implementation such as space constraints and very harsh conditions which make inappropriate the use of cables and electronic devices inside the gearbox. For this e ect, sensing devices based in SAW(Surface Acoustic Waves) technology were used. This devices are microelectromechanic (MEMS) systems whose characteristics are appropriate to the harsh conditions at hand. In order to proceed with the study two mechanical set- ups have been fabricated, to support the sensors evaluation tests. The rst consisted in a static set- up designed to proceed to the calibration of the strain sensors for torque measurement. The second was a dynamic set- up designed to reach rotation speed as high as 2500 rpm and with the capability of heating the sensors application area above its operating range. This set- up accommodated tests to evaluate the e ect of speed and temperature in the uncertainty of the measurements and nally, an experiment to perform torque measurement with temperature compensation was made. Tests to evaluate the curve dependence of the SAW sensors wrt temperature and the communication link established by two special antennas designated as RF rotary Couplers, used to establish wireless connection in rotative setups were also realized. The results obtained allowed the achievement of several conclusion regarding the work done and future improvements, given that a complete study on the sensors behaviour with respect to the physical quantities being analysed was made and conclusions about the e ect of speed and temperature in the measurements are obtained. However, in order to obtain validation of the technology for gearbox instrumentation, actual torque measurements in a broader range (0 to 250 Nm) with compensation of temperature and vibration, under broader ranges of speed (up to 3000 rpm) and temperature (between -25 oC up to 85o C or more) would have to be accomplished.
O trabalho aqui apresentado está inserido no âmbito do projeto RTMGear, que visa a instrumentação e medição de grandezas físicas tais como binário e temperatura, diretamente a partir dos componentes rotativos da caixa de transmissão de testes, com a nalidade de validar a tecnologia usada para aplicação na indústria aeroespacial. A tecnologia estudada para realizar a monitorização em tempo real de tais grandezas são sensores SAW (sensores de onda acústica super cial) que se tratam de componentes microeletromecânicos (MEMS), com capacidade de medição em ambientes com condições difíceis como o que está a ser estudado. Com o objetivo de proceder ao estudo referido, dois set- ups mecânicos foram construídos e um conjunto de testes para estudar o comportamento dos sensores em tais condições foi efetuado: O primeiro, um set- up estático foi concebido para proceder à calibração dos sensores de binário para medição desta mesma grandeza, obtendo a curva de variação da sua resposta em função da gama de binário aplicada com recurso a uma máquina de testes universal. Foram ainda efetuados dois testes (um por tipo de sensor) com o intuito de obter as curvas de dependência dos sensores relativamente à temperatura. O segundo, um set- up dinâmico com capacidade de atingir rotação até próximo das 2500 rpm e com capacidade de proceder ao aquecimento da área de aplicação dos sensores até temperaturas superiores às compreendidas na sua gama de funcionamento. Neste Set- up testes para avaliar o efeito da aplicação de velocidade de rotação e temperatura no erro de medição e testes nais para apurar o binário medido com compensação do efeito da temperatura, após calibração prévia, foram efetuados. Os resultados obtidos com os procedimentos experimentais descritos permitiram retirar numerosas conclusões sobre o trabalho realizado mas são insu- cientes para validar a aplicação da tecnologia. Para tal, seriam necessários testes de medição de binário numa gama superior, com compensação de temperatura fossem realizados para valores de velocidade de rotação e temperatura signi cativamente superiores ao caso apresentado em que valores de binário foram efetivamente extraídos da realização experiemtal
Reader, Nicole. "Delaware's first long term instrumented bridge a prototypical instrumentation and installation plan /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 156 p, 2007. http://proquest.umi.com/pqdweb?did=1338919141&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Повний текст джерелаChang, Huai-Ning. "Electrostatic Feedback for Mems Sensor : Development of in situ TEM instrumentation." Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11649.
Повний текст джерелаThis thesis work is about further developing an existing capacitive MEMS sensor for in situ TEM nanoindentation developed by Nanofactory Instrument AB. Today, this sensor uses a parallel plate capacitor suspended by springs to measure the applied force. The forces are in the micro Newton range. One major issue using with this measurement technique is that the tip mounted on one of the sensor plates can move out of the TEM image when a force is applied. In order to improve the measurement technique electrostatic feedback has been investigated. The sensor’s electrostatic properties have been evaluated using Capacitance-Voltage measurements and a white light interferometer has been used to directly measure the displacement of the sensor with varying voltage. Investigation of the sensor is described with analytical models with detailed treatment of the capacitive response as function of electrostatic actuation. The model has been tested and refined by using experimental data. The model showed the existence of a serial capacitor in the sensor. Moreover, a feedback loop was tested, by using small beads as load and by manually adjusting the voltage. With the success of controlling the feedback loop manually, it is shown that the idea is feasible, but some modifications and improvements are needed to perform it more smoothly.
Ask, Eric A. (Eric Andrew). "Instrumentation of a sensor for small part inspection using laswer fluorescence." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/37733.
Повний текст джерелаKupferschmidt, Benjamin. "INTEGRATING ENGINEERING UNIT CONVERSIONS AND SENSOR CALIBRATION INTO INSTRUMENTATION SETUP SOFTWARE." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604520.
Повний текст джерелаHistorically, different aspects of the configuration of an airborne instrumentation system were specified in a variety of different software applications. Instrumentation setup software handled the definition of measurements and PCM Formats while separate applications handled pre-flight checkout, calibration and post-flight data analysis. This led to the manual entry of the same data multiple times. Industry standards such as TMATS strive to address this problem by creating a data-interchange format for passing setup information from one application to another. However, a better alternative is to input all of the relevant setup information about the sensor and the measurement when it is initially created in the instrumentation vendor’s software. Furthermore, an additional performance enhancement can be achieved by adding the ability to perform sensor calibration and engineering unit conversions to pre-flight data visualization software that is tightly coupled with the instrumentation setup software. All of the setup information can then be transferred to the ground station for post-flight processing and data reduction. Detailed reports can also be generated for each measurement. This paper describes the flow of data through an integrated airborne instrumentation setup application that allows sensors and measurements to be defined, acquired, calibrated and converted from raw counts to engineering units. The process of performing a sensor calibration, configuring engineering unit conversions, and importing calibration and transducer data sheets will also be discussed.
Freeborn, Scott Stuart. "Pulsed laser photoacoustic instrumentation for the monitoring of crude oil in produced water." Thesis, Heriot-Watt University, 1997. http://hdl.handle.net/10399/1241.
Повний текст джерелаMONK, DAVID JAMES. "DEVELOPMENT OF A REMOTE SPECTROELECTROCHEMICAL SENSOR FOR TECHNETIUM AS PERTECHNETATE." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1052761078.
Повний текст джерелаLiao, FengTing. "Development of xenon level instrumentation for the LZ dark matter detector." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:271ab287-bd35-40b9-ba56-be662f9aad35.
Повний текст джерелаDarr, Timothy, Ronald Fernandes, Michael Graul, John Hamilton, and Charles H. Jones. "Automated Configuration and Validation of Instrumentation Networks." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606234.
Повний текст джерелаThis paper describes the design and implementation of a test instrumentation network configuration and verification system. Given a multivendor instrument part catalog that contains sensor, actuator, transducer and other instrument data; user requirements (including desired measurement functions) and technical specifications; the instrumentation network configurator will select and connect instruments from the catalog that meet the requirements and technical specifications. The instrumentation network configurator will enable the goal of mixing and matching hardware from multiple vendors to develop robust solutions and to reduce the total cost of ownership for creating and maintaining test instrumentation networks.
Delezoide, Camille. "Polymer microring resonators for optofluidic evanescent field sensors." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-00846193.
Повний текст джерелаDon, Michael, and Tom Harkins. "Achieving High Resolution Measurements Within Limited Bandwidth Via Sensor Data Compression." International Foundation for Telemetering, 2012. http://hdl.handle.net/10150/581447.
Повний текст джерелаThe U.S. Army Research Laboratory (ARL) is developing an onboard instrument and telemetry system to obtain measurements of the 30mm MK310 projectile's in-flight dynamics. The small size, high launch acceleration, and extremely high rates of this projectile create many design challenges. Particularly challenging is the high spin rate which can reach 1400 Hz at launch. The bandwidth required to continuously transmit solar data using the current method for such a rate would leave no room for data from other sensors. To solve this problem, a data compression scheme is implemented that retains the resolution of the solar sensor data while providing room in the telemetry frame for other measurements.
Ayranci, Cagri. "Development and testing of a Long Gage Strain (LGS) sensor for concrete structure instrumentation." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/26844.
Повний текст джерелаOh, Ki Dong. "Optical Fiber Fabry-Perot Interferometer based Sensor Instrumentation System for Low Magnetic Field Measurement." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/29687.
Повний текст джерелаPh. D.
JACOBS, JOHN DAVID. "HYPERSPECTRAL PLANNER INSTRUMENTATION FOR PRODUCT GOAL SYNTHESIS IN MATERIAL PROCESS CONTROL." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin995300151.
Повний текст джерелаFerreira, Gonzalez Javier. "Textile-enabled Bioimpedance Instrumentation for Personalised Health Monitoring Applications." Licentiate thesis, KTH, Medicinska sensorer, signaler och system (MSSS), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-120373.
Повний текст джерелаQC 20130405
Pleiman, Brock Joseph. "Calibration of a Flow Angularity Probe with a Real-Time Pressure Sensor." University of Dayton / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1568119292467936.
Повний текст джерелаDavis, Bradford S., and T. Gordon Brown. "COMBINING SENSORS WITH AIRBORNE TELEMETRY INSTRUMENTATION TO MAKE RANGE MEASUREMENTS AND OBTAIN AERODYNAMICS." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/608710.
Повний текст джерелаObtaining a projectile’s free-flight motion profile and its aerodynamic coefficients is typically accomplished at indoor test ranges using photographic techniques synchronized to timing stations. Since these ranges are relatively short, many discrete tests are necessary to compile a complete understanding of the projectile’s behavior. When Time Space Position Information (TSPI) is requested over long-range flights, it has been gathered with expensive video, laser, and radar trackers. These can be inaccurate at times and are limited to locations where the range equipment is able to track the projectile’s entire flight. With the ever-increasing sophistication of ordnance, such as smart and competent munitions that have multi-stage thrusting and maneuvering capability, it is becoming increasingly difficult to make the necessary measurements using current measurement techniques. Microelectromechanical Systems (MEMS) sensors and other electro-optical and magnetic sensors referenced to the sun and earth allow the projectile’s angular rates (spin, pitch, and yaw) and accelerations (axial and radial) to be measured throughout the flight. These sensors have been packaged into miniaturized telemetry instrumentation systems and placed within empty voids of the munition or in place of the fuze or warhead section. By combining this sensor data with a 6-DOF trajectory code, many of the projectiles aerodynamic coefficients including drag, static moment, and damping moment over a large Mach Number range and over multiple flight paths have been obtained. These techniques decrease the number of test shots required, reduce the complexity of the test setup, and reduce the test costs. Test data from instrumented tank, artillery, and rocket flight tests are presented in this report to show the current capability of making inflight measurements using telemetry-based techniques.
Santos, Jesulino Bispo dos. "Sensor de frente de onda para uso oftalmológico." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/82/82131/tde-03122004-124215/.
Повний текст джерелаThis work describes the steps involved in the aberroscope prototype development for ophthalmological use. This instrument injects inside the human eye a low power light beam and sample, by Hartmann method, the wavefronts produced by ocular fundus light scattering. From collected data, the wavefront shape is reconstructed and the eye aberrations that eventually existent are calculated and adjusted by Zernike polynomials. Are discussed the method foundations, some of properties and limitations. Also the functional characterization of the developed prototype is shown, by testing it with optical elements of known properties
Earp, Brian Edward. "Convective Heat Flux Sensor Validation, Qualification and Integration in Test Articles." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/77171.
Повний текст джерелаPh. D.
Meritt, Ryan James. "Skin Friction Sensor Design Methodology and Validation for High-Speed, High-Enthalpy Flow Applications." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/54569.
Повний текст джерелаPh. D.
Shepherd, Richard Stephen. "Thin film sensor techniques for the instrumentation of ceramic/metal interfaces in next generation aero gas turbines." Thesis, University of Salford, 1999. http://usir.salford.ac.uk/14761/.
Повний текст джерелаGriffiths, Alan David, and alan griffiths@anu edu au. "Development and demonstration of a diode laser sensor for a scramjet combustor." The Australian National University. Faculty of Science, 2005. http://thesis.anu.edu.au./public/adt-ANU20051114.132736.
Повний текст джерелаDuarte, Luís Fernando Caparroz 1980. "Sistema automatizado georreferenciado sem fio para irrigação localizada auxiliado por sensor de unidade do solo." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261378.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-16T03:41:59Z (GMT). No. of bitstreams: 1 Duarte_LuisFernandoCaparroz_M.pdf: 22217268 bytes, checksum: 70f7c5dbf0e7a70f46654592aa364159 (MD5) Previous issue date: 2010
Resumo: A preocupação com o futuro dos recursos hídricos e o valor agregado dos produtos da agricultura de precisão leva os produtores agrícolas a procurarem formas mais inteligentes e precisas do manejo da água. Neste trabalho apresenta-se uma proposta de um sistema automatizado georreferenciado de irrigação localizada baseado em leitura de sensor de umidade do solo, que visa baixo custo e é independente de uma rede de comunicações atuante em tempo integral ou de uma central de processamento. Neste trabalho foi desenvolvido um Módulo de Irrigação Localizada Inteligente, que atua de acordo com o processamento das informações obtidas pelo sensor de umidade do solo. Também foram desenvolvidos um Módulo Programador responsável pela entrada dos dados e programação dos módulos de irrigação e um Módulo Acionador para Bombas d'Água, que liga e desliga a bomba d'água de acordo com a programação dos módulos de irrigação. Os módulos, que atuam de forma independente, são programados por comunicação sem fio, baseada no SimpliciTI, um protocolo de comunicação sem fio de código aberto da Texas Instruments.
Abstract: Concerns about the future of the water resources and the value of precision agriculture products takes the farmers to look for more intelligent and precise ways to manage the water. This work presents a proposal of an automated georeferenced localized irrigation system aided by soil moisture sensor, that aims for low cost and is independent of a sensor network or a processing central. In this work it was developed an Intelligent Localized Irrigation Module, that actuates according to the informations acquired by the soil moisture sensor. It was also developed a Programming Module, responsible for the data entry and the irrigation modules programming and a Water Bomb Actuator Module, that turns on and off the water bomb according to the irrigation modules program. The independent working modules are programmed wirelessly, based on SimpliciTI, an open source wireless protocol from Texas Instruments.
Mestrado
Eletrônica, Microeletrônica e Optoeletrônica
Mestre em Engenharia Elétrica
Yusifli, Elmar. "Développement d'une instrumentation embarquée pour le contrôle de dermes équivalents en culture." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD020.
Повний текст джерелаThe skin is an organ which can regenerate and heal. It is the first shield of protection of our body against external physico-chemical aggression. For several decades, researches have been conducted to control the dermis culture for several applications such as grafting large burns. The technological aspect of this area has been the subject of several works. In the 2000s, the team of our laboratory proposed the dermis culture method associated with silicon microsystems. This is the only current method that allows the measurement of isometric forces of the equivalent dermis during its culture.In a first stage of study, in order to produce a miniaturized and low-cost bio-device, we proposed new methods to measure isometric forces in reconstructed skins in culture between two silicon beams. Thus, the optimal dimensions were calculated and new beams were fabricated. The chosen optimization is related to improve the sensitivity of the force measurement. To quantify the deflection of the beams due to the isometric forces applied by the dermis in culture, we opted for the measurement of the displacements of the beams under the influence of the isometric forces by using surface acoustic waves (SAW). This choice is justified by the simplicity of the integration of the interdigital transducers (IDT) that generate the SAW, the possibility of using a wireless interrogation and the physical realization of the cross-correlation of the generated waves.Using simulation, we have identified the frequency deviations caused by wave deformations. Indeed, the dissymmetry of the cross-correlation curve of the signals generated and received by IDT is closely related to the frequency deviation of the received wave. We have evidenced that the beam deflection generates the dissymmetry in the time axis which can be measured more precisely within the limits of sampling. Two demonstrators were designed and manufactured in the clean room to validate the instrumentation and the principle of transducing a chirped signal with a SAW. The obtained results show that the proposed SAW-based force measuring method allows us to measure force, but in a higher intensity range than expected. Subsequently, we studied the method of force measurement by piezoresistors. Considering that the technique is based on the variation of resistivity of the deformed material, we decided to replace the silicon grids provided for the attachment of the dermis in culture by the piezoresistive material implanted on the silicon micro-beams. To improve the low-resolution detection, a series of calculations and simulations of the positions and the dimensions of the piezoresistive material and the micro-beams have been carried out and presented. Another study that we conducted in parallel concerns the development of an on-board instrumentation to monitor the growth of the dermis in culture based on a vision system. Considering of the strict conditions of our specifications that required the portability and autonomy of the final system, we developed an embedded vision system based on a camera module and a FPGA card. The high definition camera mounted on the system of final culture box with a lens allows to take fluorescence images of cells in culture
Canu, Antoine. "Conversion Analogique / Numérique versatile dans un environnement avionique contraint." Thesis, Supélec, 2013. http://www.theses.fr/2013SUPL0004/document.
Повний текст джерелаAvionic embedded systems sense their environment through the use of various sensors. Currently, the electrical signals generated by these sensors are acquired by dedicated interface circuits, which limits the functionalities that can be implemented in the computer and slows down their evolution.Our work aims at replacing these interfacing circuits by a more flexible interface, called versatile interface, which has the ability to acquire different kind of signals. Avionic embedded systems usually operate in a pretty harsh environment, in which important common mode voltages of more than thirty volts can superimpose to useful signals. After a thorough exploration of this environment and its specifities, we propose an architecture of the versatile interface, based on a mixed signal ASIC and a FPGA. The ASIC includes a programmable analog signal conditioning stage which is able to withstand the high voltages present in the harsh avionic environment. The FPGA processes the different signals and extract the useful information from them. We also propose method which allows to correct the analog imprecisions due to mismatch or temperature drifts. This method uses analog and digital processing, and allow our versatile interface to be immune to process or temperature variations. A test circuit has been realized in a high voltage 0.35µm CMOS technology, in order to validate the different principles that we propose in this work
Hart, Alan D. "THE APPLICATION OF HARDENED CRYSTAL REFERENCE OSCILLATORS INTO THE HARDENED SUBMINIATURE TELEMETRY AND SENSOR SYSTEM (HSTSS) PROGRAM." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/608741.
Повний текст джерелаThis paper briefly reports on concepts for hardening (physically toughening) crystal reference oscillators for the highly integrated program known as HSTSS. Within the HSTSS program is the L & S band transmitter development contract. The harshest requirements for this contract are surviving and functioning, to within 20 ppm of its center frequency, 30 ms after sustaining a shock pulse of 100,000 (g) for 0.5 ms on any axis. Additional requirements call for the transmitter to be no larger than 0.2 in3, and to operate within a 20 ppm frequency stability throughout the temperature range of -400 to +850 centigrade and during centrifugal spins of up to 300 Hz or 25,000 (g). Fundamentally the question is, is it feasible for any telemetry system to be capable of withstanding such harsh conditions and, to be practical on all DoD Test Ranges, still adhere to the stability tolerance guidelines set forth by the Range Commanders Council on Telemetry Standards - IRIG 106-96? Under "normal" conditions, stability requirements for "Range" transmitters are easily satisfied through the use of off-the-shelf crystal reference oscillators which provide the reference frequencies required within a transmitter’s phase lock loop circuitry. Unfortunately, the oscillator is also the most vulnerable part of a transmitter to the conditions listed and is the key to this problem. The oscillator’s weak points are in its resonator’s fragile quartz structure (the blank) and support mechanism. The challenge is to invent and adapt this area to these newer harsher conditions and to do it in the smallest space ever required.
Fadriquela, Joshua-Jed Doria. "Design, Fabrication, and Implementation of a Single-Cell Capture Chamber for a Microfluidic Impedance Sensor." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/189.
Повний текст джерелаMahdavifar, Alireza. "Computational and experimental development of ultra-low power and sensitive micro-electro-thermal gas sensor." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54923.
Повний текст джерелаRameh, Hala. "Instrumentation optimale pour le suivi des performances énergétiques d’un procédé industriel." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEM032/document.
Повний текст джерелаEnergy efficiency is becoming an essential research area in the scientific community given its importance in the fight against current and future energy crises. The analysis of the energy performances of the industrial processes requires the determination of the quantities involved in the mass and energy balances. Hence: how to choose the placement of the measurement points in an industrial site to find the values of all the energy indicators, without engendering an excess of unnecessary information due to redundancies (reducing measurements costs) and while respecting an accepted level of accuracy of the results ? The first part presents the formulation of the instrumentation problem which aims to guaranteeing a minimal observability of the system in favor of the key variables. This problem is combinatory. A method of validation of the different sensors combinations has been introduced. It is based on the structural interpretation of the matrix representing the process. The issue of long computing times while addressing medium and large processes was tackled. Sequential methods were developed to find a set of different sensor networks to be used satisfying the observability requirements, in less than 1% of the initial required computation time. The second part deals with the choice of the optimal instrumentation scheme. The difficulty of uncertainty propagation in a problem of variable size was addressed. To automate the evaluation of the uncertainty for all the found sensor networks, the proposed method suggested modeling the process based on binary parameters. Finally, the complete methodology is applied to an industrial case and the results were presented
Fan, Zihao, and Wei Zhao. "Network Coverage Optimization Strategy in Wireless Sensor Networks Based on Particle Swarm Optimization." Thesis, Högskolan i Gävle, Akademin för teknik och miljö, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-9764.
Повний текст джерелаRoux, Julien. "Conception d'un capteur distribué pour la surveillance de l'état hydrique des sols." Thesis, Toulouse, INSA, 2017. http://www.theses.fr/2017ISAT0031/document.
Повний текст джерелаOwing to the development of the smart farming, some new studies need to be lead on a distributed instrumentation to measure soil moisture to control the irrigation.In the project IRRIS context, we realize a smart soil moisture sensor. First, we have to realize the sensing element of this sensor. We choose a capacitive detection to get a reactive sensor despite low cost. The body is a cylinder to be easily buried in the soil. The electrodes are made by electrochemical deposition on the plastic tube. Then, we design the measurement electronic. We compare two solutions, one with discrete components and the other software on embedded microcontroller. We submit those electronics at thermic variations to observe their comportment to create the law of compensation. Next we assemble the sensor according to two ways. The first, the multi sensor, forces the depths of sensing but reduces the costs by pooling the measurement electronic. The second, the mono sensor, frees the choice of depth but multiplies the number of sensors. We create at this step the sensor network thanks a wireless communication placed on 868MHz, an ISM band that we characterize in terms of range depending on the flow rate to optimize this communication. Finally, we observe the results of three measurement campaigns to validate the operating for different soil and cultures.This study ends in the realization of a sensor to measure soil moisture with a reduced cost relative to the industrial sensor on the market. Experiments prove its ease of use as well as its proper functioning
Albino, André Filipe Rendeiro. "Radiação solar: estudo e criação de plataforma de apoio à conceção de um sensor de radiação solar." Master's thesis, Universidade de Évora, 2014. http://hdl.handle.net/10174/12995.
Повний текст джерелаParmar, Biren Jagadish. "Development Of Point-Contact Surface Acoustic Wave Based Sensor System." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/279.
Повний текст джерелаRossi, Anderson Rodrigo 1981. "Uma nova técnica de comunicação e alimentação de transdutores inteligentes utilizando apenas um fio baseada no padrão IEEE 1451." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258976.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: Sabe-se que atualmente, transmissores de loop de corrente, alimentados por um host ou data logger (equipamentos de leitura e/ou armazenamento de dados) são as técnicas mais utilizadas para medição e controle distribuído. Essa transmissão, normalmente, consiste na conexão individual por meio de, no mínimo, um fio, conectando os sensores remotos ao equipamento de leitura de dados. Ressalta-se que, se faz necessária a utilização de um fio terra para o retorno da corrente elétrica juntamente a esse fio de sinal, sendo descrito no texto como "um fio". Consequentemente, com a complexidade envolvida em um processo industrial, tem-se uma grande quantidade de sensores envolvidos, de modo que a ligação de todos os sensores ocasiona uma grande quantidade de fios que convergem para o equipamento de leitura de dados, gerando uma enorme complexidade nas decisões a serem tomadas em relação à instalação e manutenção do sistema. O trabalho tem como objetivo utilizar apenas um fio para a conexão entre vários sensores e atuadores remotos e o equipamento de leitura de dados, a fim de obter, com a diminuição da quantidade de cabeamento, melhoria no controle, precisão nas decisões a serem tomadas, consequentemente, uma maior simplicidade na manutenção e expansão do sistema, além de ser bastante estável às interferências eletromagnéticas, pois o fio recebe a mesma interferência eletromagnética em toda sua extensão e esse efeito se anula permitindo a comunicação entre grandes distâncias. Trata-se de um sistema de interfaceamento de sensores inteligentes a equipamentos de leitura de dados baseado nos padrões IEEE 1451, o qual emprega uma técnica para envio e recebimento de dados e a própria alimentação dos sensores remotos utilizando apenas um fio. O sistema proposto é formado por um NCAP (Network Capable Application Processor), um TII (Transducer Independent Interface), um TIM (Transducers Interface Module), 64 sensores e 64 atuadores caracterizando 128 TransducerChannels. Foi realizado um comparativo com um sistema utilizado pela FEAGRI-UNICAMP (Faculdade de Engenharia Agrícola) para a medição de temperatura no processo de armazenamento com secagem de grãos em silos por aeração forçada para a validação do sistema. Com isso pôde-se verificar as vantagens com relação à rapidez na instalação, facilidade de manutenção, redução de materiais (fios) e confiabilidade no sistema
Abstract: It's known that nowadays, current loop transmitters, fed by a host or a data logger are the most commonly used techniques to distributed measurement and control. Usually this transmission consists of an individual connection through at least a wire pair, connecting the remote sensors to the data logger. It's noted that it's necessary the use of the ground wire to electric current return with this signal wire, it's described at the text as "1 wire". Consequently, with the complexity involved in an industrial process, there is a great amount of involved sensors, in a way that all sensors connection causes a need of a great amount of wires that converge to the data reading equipment, causing a tremendous complexity around the decisions to be taken about the installation and maintenance of the system. This work has as objective using just 1-Wire (a source/communication wire and a common wire) to connect many remote sensors and actuators to the data logger, causing, with the reduction of the cabling amount, a control improvement, accuracy in the decisions to be taken, consequently, a great simplicity in the system maintenance and expansion, besides it's very stable against electromagnetic interference (EMI), because 1-Wire receives the similar EMI and it cancel this effect allowing taking possible to communicate for greater distances. This work discusses the smart sensors interface to data logger based on IEEE1451 standard and it uses a sending/receiving data and sourcing technique using just 1-Wire. The proposed system is formed by a NCAP (Network Capable Application Processor), a TII (Transducer Independent Interface), a TIM (Transducers Interface Module), 64 sensors and 64 actuators, characterizing 128 TransducerChannels. A comparison was made with a system that is used by FEAGRI-UNICAMP (College of Agricultural Engineering - University of Campinas) to measure the temperature at the storage process with grain drying in recipients by forced aeration to validate the system. Thus it can be verified the advantages related to the velocity in the installation, easier maintenance, materials reduction (wires) and reliability on the system
Mestrado
Eletrônica, Microeletrônica e Optoeletrônica
Mestre em Engenharia Elétrica
Leslie, Brian Robert. "Design, Analysis, and Testing of Nanoparticle-Infused Thin Film Sensors for Low Skin Friction Applications." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/19199.
Повний текст джерелаPh. D.
Davis, Joseph P. "Electronic Interface for an Inductive Wear Debris Sensor for Detection of Ferrous and Non-Ferrous Particles." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1380998832.
Повний текст джерелаOliveira, Alex Lopes de. "Instrumentação inteligente via web services." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-13122006-150545/.
Повний текст джерелаIn this work is presented the integration of an established system of intelligent instrumentation with the Web Service?s architecture, in accordance with the IEEE 1451.1 standard. It is suggested the association of a data-communication protocol with the concept of Transducer Electronic Data Sheet (TEDS) to a Web Service for making possible the remote configuration of a data acquisition system. Through a remote supervisor interface, accessible via Internet from any browser, the user can, at the first moment, identify which are the smart sensors connected in a network, using an unique identification associated to its characteristics (type, data formatting, etc.). In the same graphical interface the user can choose which sensors wants to monitor and, after the selection, will have available the monitoring interface that enables data visualization through a graph and allows the user to save the collected data in a text file. In the same monitoring interface the Web Service is also available; it admits modifications on the data collection interval. A group of computers in a local network (Intranet) simulates the smart sensors network. In the same network is connected a server responsible for supplying the remote supervisor interface.
Canata, Tatiana Fernanda. "Sistema de mensuração baseado em tecnologia LiDAR para a estimativa de parâmetros de produção de cana-de-açúcar." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/11/11152/tde-29092017-184829/.
Повний текст джерелаThe economic participation of sugarcane (Saccharum spp.) is significant in Brazilian agribusiness, especially in the state of São Paulo. The yield monitoring for this crop is scarce of solutions consolidated at the research and commercial levels. Such monitoring assists for identification of spatial and temporal variability, as well as providing support to the agricultural management. As an alternative laser sensors, covered by LiDAR (Light Detection and Ranging) technology, have been used by aerial or terrestrial platforms for estimating grain crops yield such as corn and wheat, and for noninvasive forest monitoring. The objective of this study is to investigate the laser sensor applications for sugarcane in the pre-harvest period from development of a measurement system. The measurement system consists of a laser sensor, a Global Navigation Satellite System (GNSS) receiver, an inertial unit and a computer. The laser sensor emits light beams (905 nm) in the form of a single pulse in a 2D plane, from these beams the distance values between sensor and canopy were calculated during the trajectory of the agricultural vehicle. The GNSS receiver with RTK (Real Time Kinematic) signal was synchronized to the laser sensor to obtain the point cloud, which is characterized by the allocation of each point impacted by the light beam in the respective geographical coordinates. The inertial unit provides information related to the data influence of the vibration from oscillation in the transversal (roll), lateral (pitch) and longitudinal (yaw). The equipment were installed in a support of metallic structure in the agricultural tractor and connected to the computer through communication protocols. The development of the measurement system involves evaluation of its accuracy using objects of pre-established dimensions and its application in experimental areas of sugarcane. Two periods are covered by this study, one in 2015 for area I (0.77 ha) and the second in 2016 using areas I and II (0.56 ha). The data acquisition occurred about 10 days before sugarcane harvest and, in parallel, the biometrics measurements were carried out. In 2015 sugarcane yield was estimated by biometry and in 2016 material was weighed for each plot of areas I and II. The results regarding evaluation of the measurement system accuracy showed errors up to 13.0%, which does not compromise its performance. From the data acquisition and processing procedures, it was possible the point cloud generation, data filtering performing and extraction of some measurements as maximum, average and median heights of vegetation. The influence of the vibration on data set was considered more expressive for area I conditions. The correlation between stem diameter and yield estimated by biometry in area I in 2015 was 0.80. Meanwhile, the correlation between stem diameter and vegetation height indicated by the measurement system was moderate (r=-0.53). In 2016, for the same area, the correlation between measurements of average and median heights of vegetation obtained by the system and sugarcane yield was 0.64. For area II conditions no correlations were verified between biometrics measurements and vegetation height. The measurement system using a terrestrial platform presented a satisfactory performance in relation to the capacity of detection of sugarcane plants distribution and consistent with areas conditions for both periods of study, however its application in areas with low spatial variability presented reduced predictive capacity of biomass production of sugarcane.
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.
Повний текст джерелаSvärd, Daniel. "Design and evaluation of a capacitively coupled sensor readout circuit, toward contact-less ECG and EEG." Thesis, Linköping University, Department of Electrical Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-54520.
Повний текст джерелаIn modern medicine, the measurement of electrophysiological signals play a key role in health monitoring and diagnostics. Electrical activity originating from our nerve and muscle cells conveys real-time information about our current health state. The two most common and actively used techniques for measuring such signals are electrocardiography (ECG) and electroencephalography (EEG).
These signals are very weak, reaching from a few millivolts down to tens of microvolts in amplitude, and have the majority of the power located at very low frequencies, from below 1 Hz up to 40 Hz. These characteristics sets very tough requirements on the electrical circuit designs used to measure them. Usually, measurement is performed by attaching electrodes with direct contact to the skin using an adhesive, conductive gel to fixate them. This method requires a clinical environment and is time consuming, tedious and may cause the patient discomfort.
This thesis investigates another method for such measurements; by using a non-contact, capacitively coupled sensor, many of these shortcomings can be overcome. While this method relieves some problems, it also introduces several design difficulties such as: circuit noise, extremely high input impedance and interference. A capacitively coupled sensor was created using the bottom layer of a printed circuit board (PCB) as a capacitor plate and placing it against the signal source, that acts as the opposite capacitor plate. The PCB solder mask layer and any air in between the two acts as the insulator to create a full capacitor. The signal picked up by this sensor was then amplified by 60 dB with a high input impedance amplifier circuit and further conditioned through filtering.
Two measurements were made of the same circuit, but with different input impedances; one with 10 MΩ and one with 10 GΩ input impedance. Additional filtering was designed to combat interference from the main power lines at 50 Hz and 150 Hz that was discovered during initial measurements. The circuits were characterized with their transfer functions, and the ability to amplify a very low-level, low frequency input signal. The results of these measurements show that high input impedance is of critical importance for the functionality of the sensor and that an input impedance of 10 GΩ is sufficient to produce a signal-to-noise ratio (SNR) of 9.7 dB after digital filtering with an input signal of 25 μV at 10 Hz.
Gylfason, Kristinn Björgvin. "Integrated Optical Slot-Waveguide Ring Resonator Sensor Arrays for Lab-on-Chip Applications." Doctoral thesis, KTH, Mikrosystemteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12214.
Повний текст джерелаQc20100715
SABIO
Munoz, Nates Franco Miller. "Contribution à l'analyse biomécanique de l'activité en kayak. Mise en place et validation d'une chaîne de mesure dynamométrique tridimensionnelle." Thesis, Poitiers, 2013. http://www.theses.fr/2013POIT2333/document.
Повний текст джерелаThe modern training methods developed during the last 20 years involve specific equipments named ergometer. These devices allow semi-specific training sessions on a sheltered environment to develop strength during unfavorable periods of in situ practice. They are also more and more used by coaches to evaluate athlete’s skills and aptitudes. Ergometers provide numerical information that cannot be easily measured during in situ sessions. This work is a significant contribution of the following scientific problems; firstly the design of a flat-water kayak ergometer that reproduces accurately on-water conditions, both kinematics and forces generated (dynamic) during the throughout the whole kayaking cycle, secondly, to propose and validate an instrumentation to collect every dynamic interactions between the ergometer and kayaker (hands, seat, feet). In addition, this instrumentation must be design in terms of weight, size and watertightness to be installed in a kayak K1 for in situ measurements. This instrumentation quantifies the basic biomechanics parameters of the kayaking performance such as external forces, endurance, technique, etc. As a result, researchers and coaches will be able to evaluate kayakers’ performance using an unbiased device. This work was conducted as part of a scientific collaboration between the RoBioSS research team, CAIPS and SENSIX compagny
Salido, Monzú David, and Sánchez Oliver Roldán. "Robot Positioning System : Underwater Ultrasonic Measurement." Thesis, Mälardalen University, School of Innovation, Design and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-5817.
Повний текст джерелаThis document provides a description about how the problem of the detection of thecenter of a defined geometry object was solved.This named object has been placed in an experimental environment surrounded bywater to be explored using microwaves under the water, to try to find a possibletumor. The receiver antenna is fixed in the tip of the tool of an ABB robot.Due to this working method, it was necessary to locate the center of this object tomake correctly the microwave scanning turning always around the actual center. Thiswork not only consist in give a hypothetic solution to the people who gave us theresponsibility of solve their problem, it is also to actually develop a system whichcarries out the function explained before.For the task of measuring the distance between the tip of the tool where themicrowave antenna is, ultrasonic sensors has been used, as a complement of acomplete system of communication between the sensor and finally the robot handler,using Matlab as the main controller of the whole system.One of these sensors will work out of water, measuring the zone of the object which isout of the water. In the other hand, as the researching side of the thesis, a completeultrasonic sensor will be developed to work under water, and the results obtained willbe shown as the conclusion of our investigation.The document provides a description about how the hardware and software necessaryto implement the system mentioned and some equipment more which were essentialto the final implementation was developed step by step.
Nguyen, Tien Anh. "Instrumentation électronique et diagnostic de modules de puissance à semi-conducteur." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2013. http://tel.archives-ouvertes.fr/tel-00910357.
Повний текст джерелаTangerino, Giovana Tripoloni. "Sistemas de sensoriamento embarcado para uso em controle de aplicações de insumos agrícolas à taxa variável." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18145/tde-02032010-153816/.
Повний текст джерелаThe development of systems able to join different technological tools is very important in order to provide support for Precision Agriculture and it stimulates the creation of interdisciplinary teams to obtain favorable results to increase agricultural productivity. The main goal of this work is to study applications of embedded sensing systems in agricultural machines, exploring the interface between computer science, mechanical, electrical, and agricultural engineering using concepts and technologies of measurement systems. It was developed two on board sensing systems. The first system collected the data of crop reflectance and plant height in sugar cane growing area. The second one controlled the variable rate fertilizer distribution based on reflectance of maize crop. Were used the sensors Crop Circle (reflectance to monitor the status of the plant), Sonar (plant height) and GPS (Global Positioning System), which were applied to detect some possible error sources during field operation. The systems developed fulfilled the role of integrating knowledge, providing practical observations about the needs, failures and successes in developing embedded systems for use in agricultural production