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Littérature scientifique sur le sujet « Measurements and monitoring »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Measurements and monitoring"

Markuze, Yu I., Anh Cuong Le, Thi Thu Nguyen et Hai Nam Dinh. « Monitoring coarse measurement errors and initial data ». Geodesy and Cartography 937, n^o 7 (20 août 2018) : 11–16. http://dx.doi.org/10.22389/0016-7126-2018-937-7-11-16.

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Rough errors are a consequence of the observer’s miscalculations, device malfunctions, their displacements at the time of measurement, incorrect measurement techniques chosen, rapid and sharp deterioration of external conditions and other causes. That is why, one of the problems in the theory of mathematical processing geodetic measurements is culling measurements containing gross errors. In the last two decades received recursion equalization has been widespread. It enables evaluating the unknown while new measurements are added to the network and measurements with gross errors are deleted [3, 4]. In the article, a complementary recurrent equalization is developed. It is original, convenient and recommended for wide application in production.

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P, Tuccimei. « mproving Gas Permeability Measurements for Environmental Monitoring and Management ». Open Access Journal of Waste Management & ; Xenobiotics 2, n^o 2 (2019) : 1–11. http://dx.doi.org/10.23880/oajwx-16000123.

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Intrinsic permeability is a crucial parameter to interpret soil gas data recorded from monitoring stations in different environmental settings. It is also fundamental for environmental management and pollution reme diation. An improved version of a permeameter (PRM3) recently developed for environmental applications is presented and calibrated against a reference instrument (RADON - JOK produced by RADON v.o.s.). The innovations of this prototype are: i) the absence of the flow meter, and ii) a membrane pump in place of a rotary vane device. Proper calculation of the permeability from Darcy’s law is provided, as well as a modified formula for permeability determination in volcanic areas. Actually, soil gas viscosity and permeability are affected by changing gas temperature and composition. The effects of these two parameters on soil gas viscosity and permeability are also displayed. The second part of the paper shows the employ of permeability measurements in environment al monitoring. The aim of these field - works was the study of lateral and vertical variability of soil permeability at a very small scale (step of 0.25 m) and the effect of intrinsic permeability on gas transport through the soil and on gas concentration al ong depth profiles . We chose 2 different test sites: Valle della Caffarella (Roma, Italy) and Solfatara Volcano (Pozzuoli, Italy) areas. A specific protocol, designed to check any interference among permeability measurements carried out at very close dista nces demonstrated that no disturbance is occurring. Intrinsic permeability profiles resulted to be good proxy indicators for the degassing style of the two areas. In both cases, it gave important hints to interpret environmental data and help in the manage ment of the sites.

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Waidson, Mike. « HDTV Measurements and Monitoring ». SMPTE Journal 111, n^o 2 (février 2002) : 71–79. http://dx.doi.org/10.5594/j16390.

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Hujo, Ľ., Z. Tkáč, J. Tulík, J. Kosiba, D. Uhrinová et M. Jánošová. « Monitoring of operation loading of three-point linkage during ploughing ». Research in Agricultural Engineering 62, No. 1 (30 mars 2016) : 24–29. http://dx.doi.org/10.17221/10/2015-rae.

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The research was focused on operational measurements of tractor plough tools and their subsequent utilisation and simulation under laboratory conditions by a hydrostatic simulator. In this field, theoretical and experimental works were focused on tractors, whereby the proposal of laboratory test arose out of the loading characteristics of the three-point linkage of the tractor. These characteristics were obtained from the agricultural tractor’s operation in plough aggregation. Measurements were performed with the following tools: tractor with carrier-mounted four-mouldboard plough PH1-435 and tractor with Kuhn plough manufactured by. The subject of these measurements was to obtain the time courses of forces and pressures in the hydraulic system of the three-point linkage during ploughing with carrier-mounted and semi-mounted ploughs. For objective comparison of the obtained results during experimental measurements, we determined the characteristics of measurement conditions focused on physical and mechanical properties of the soil – bulk density, moisture, penetrometer resistance and slide strength of the soil.

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Menzel, Tobias, et Wolfgang Potthast. « Validation of a Unique Boxing Monitoring System ». Sensors 21, n^o 21 (20 octobre 2021) : 6947. http://dx.doi.org/10.3390/s21216947.

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Much development work and scientific research has been conducted in recent years in the field of detecting human activity and the measurement of biomechanical performance parameters using portable sensor technologies, so-called wearable systems. Despite the fact that boxers participating in one of the most vigorous and complex disciplines of all sports, it is one of the disciplines where no noteworthy, advanced performance analytic tools are used for training or for competition purposes worldwide. This research aimed to develop and validate a comprehensive punch performance sensor system for the measurement and analysis of biomechanical parameters in the sport of boxing. A comprehensive validation study on linear regression was conducted following the development of the sensor system, between the gold standard of a Kistler force plate and Vicon motion capture system, to compare sensor-derived measurements with the gold standard-derived measurements. The developed sensor system demonstrated high accuracies ranging from R2 = 0.97 to R2 = 0.99 for punch force, acceleration, velocity and punch-time data. The validation experiments conducted demonstrated the significant accuracy of the sensor-derived measurements for predicting boxing-specific biomechanical movement parameters while punching in field use. Thus, this paper presents a unique sensor system for comprehensive measurements of biomechanical parameters using the developed mobile measurement system in the field of combat sports

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Kapalo, Peter, Orest Voznyak, Vasyl Zhelykh, Hanna Klymenko et Khrystyna Myroniuk. « AIR QUALITY MONITORING IN A SELECTED CLASSROOM ». Theory and Building Practice 2022, n^o 1 (20 juin 2022) : 71–79. http://dx.doi.org/10.23939/jtbp2022.01.071.

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As part of the research entitled "Experimental determination of the optimal amount of air in a selected room in Ukraine based on measurements of carbon dioxide concentration", an experimental measurement was performed in a selected school room in Ukraine. The aim of the experimental measurement was to determine the course of air temperature, relative humidity and carbon dioxide concentration during the teaching process. From the carbon dioxide concentration curves, it is possible to calculate the required ventilation intensity in the room. This article documents the results of measuring the air temperature and the carbon dioxide concentration in the room, as well as the reactions of people in the room to the air quality.

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Hicks, J. M. « In situ monitoring. » Clinical Chemistry 31, n^o 12 (1 décembre 1985) : 1931–35. http://dx.doi.org/10.1093/clinchem/31.12.1931.

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Abstract In situ monitoring has been increasingly accepted during the past five years. This approach has been applied to measurement of gas tensions such as pO2 and pCO2, to pH and ions, to the assessment of jaundice by measurement of bilirubin, and to analysis for 14CO2 after administration of labeled antipyrine and aminopyrine, for evaluation of hepatic damage. Various techniques have been developed for in situ monitoring: transcutaneous measurements, implantable sensors, ingestible radio-sensitive pills, and breath analysis. Here I review some of these approaches and their limitations. These limitations include the sparsity of circumstances under which the technique can be applied and the probable increase in health-care costs.

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Niranjana, Ms E. « Cough Monitoring with Cardiopulmonary Measurements ». International Journal for Research in Applied Science and Engineering Technology 8, n^o 5 (31 mai 2020) : 117–21. http://dx.doi.org/10.22214/ijraset.2020.5020.

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Brettle, Mike. « Future measurements for climate monitoring ». Weather 70, n^o 10 (octobre 2015) : 301–2. http://dx.doi.org/10.1002/wea.2524.

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Abbasi, Saddam Akber. « Monitoring Analytical Measurements in Presence of Two Component Measurement Error ». Журнал аналитической химии 69, n^o 11 (2014) : 1123–29. http://dx.doi.org/10.7868/s0044450214110127.

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Thèses sur le sujet "Measurements and monitoring"

Kuhlmann, Volker. « Synchronous measurements and power quality monitoring ». Thesis, University of Canterbury. Electrical and Electronic Engineering, 2004. http://hdl.handle.net/10092/6158.

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The task of simultaneous power systems measurements at locations which can be hundreds of kilometres apart carries the problem of precise synchronisation. To introduce this topic, this thesis begins with an overview of time, time stamping and synchronised data acquisition, and reviews its application to power quality monitoring. It then discusses the requirements for such systems and how different application scenarios shift the emphasis between aspects of the requirements. The complexity of a power distribution monitoring system is most dependent on the number of channels and sites which must be analysed, and the required time stamping accuracy. For some applications, samples need to be time stamped with an accuracy of 1µs. A requirements specification template is presented which aids, for example, in purchase decisions to establish needed features. A specific example of such a system, CHART III, has been developed at the University of Canterbury (Christchurch, New Zealand), which uses a hardware time base and sample dock generation, hardware time stamping, and GPS synchronisation to achieve a time stamping accuracy of 0.5 µs. The design of the time base of this system is published in this thesis and described in detail. The CHART III system was used to gain practical experience and to establish its usability and operational limitations, and provided input for the theoretical considerations of an ideal system. Synchronised distributed data acquisition using two and three CHART III instrument was performed on two live power systems, collecting data in the frequency and time domains. A number of enhancements were made as a result, particularly to the control and analysis software in the areas of extending the handling of the GPS receiver and provision of additional system status and error information. Because the emphasis of the work is on the instrumentaton, no further analysis of the collected data is presented in this thesis. The CHART III system was connected to the internet to investigate issues of remote configuration and the consolidation of sample analysis at a single powerful computer. Limits for time domain measurements, which have a higher data rate than the system can handle continuously, were established as being a minimum of 10 seconds. In a data acquisition system, the quantisation error introduced by the ADC sets a lower limit for the noise. The effects of this quantisation noise on the recovery of harmonic magnitudes and phases were examined. Simulations were performed to model the influence of ADC width, fast Fourier transform length, harmonic amplitude and harmonic order. Both magnitude and phase errors are independent of harmonic order, decrease with the number of ADC quantisation levels, and decrease with the square root of the transform length. The magnitude error is independent of the harmonic amplitude for a sufficiently large amplitude to noise ratio. The phase error is inversely proportional to the amplitude. The accuracy of a harmonic analyser can therefore be increased by increasing the ADC width or the transform length. For accuracies likely to be required by typical power quality applications, these simulations indicate that a 12 bit ADC gives sufficiently accurate results. Finally, the effect of current trends in microprocessor technology is discussed. Power quality monitoring systems can now be built much more simply and cheaply then when CHART III was designed. The most important improvement is that a single standard CPU can now handle the data from a number of channels, eliminating the need for specialised digital signal processors and the associated cost of producing software for a second architecture. Processor performance seems to be set to increase steadily, promising future improvements in time stamping accuracy, the number of channels which can be handled by one processor, and the availability of more complex analysis functions.

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Zhou, Ming. « Advanced System Monitoring with Phasor Measurements ». Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/27813.

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Phasor Measurement Units (PMUs) are widely acknowledged as one of the most promising developments in the field of real-time monitoring of power systems. By aligning the time stamps of voltage and current phasor measurements that are consistent with Coordinated Universal Time (UTC), a coherent picture of the power system state can be achieved through either direct measurements or simple linear calculations. With the growing number of PMUs planned for installation in the near future, both utilities and research institutions are looking for the best solutions to the placement of units as well as to the applications that make the most of phasor measurements. This dissertation explores a method for optimal PMU placement as well as two applications of synchronized phasor measurements in state estimation. The pre-processing PMU placement method prepares the system data for placement optimization and reduces the size of the optimization problem. It is adaptive to most of the optimal placement methods and can save a large amount of computational effort. Depth of un-observability is one of the criteria to allow the most benefit out of a staged placement of the units. PMUs installed in the system provide synchronized phasor measurements that are highly beneficial to power system state estimations. Two related applications are proposed in the dissertation. First, a post-processing inclusion of phasor measurements in state estimators is introduced. This method avoids the revision of the existing estimators and is able to realize similar results as mixing phasor data with traditional SCADA with a linear afterwards step. The second application is a method to calibrate instrument transformers remotely using phasor measurements. Several scans of phasor measurements are used to accomplish estimating system states in conjunction with complex instrument transformer correction factors. Numerical simulation results are provided for evaluation of the calibration performance with respect to the number of scans and load conditions. Conducting theoretical and numerical analysis, the methods and algorithms developed in this dissertation are aimed to strategically place PMUs and to incorporate phasor measurements into state estimators effectively and extensively for better system state monitoring. Simulation results show that the proposed placement method facilitates approaching the exact optimal placement while keep the computational effort low. Simulation also shows that the use of phasor measurement with the proposed instrument transformer correction factors and proposed state estimation enhancement largely improves the quality of state estimations.
Ph. D.

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Engelbrecht, André. « Structural integrity monitoring using vibration measurements ». Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-07032006-122342/.

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Al-Haider, Sahailah Ahmed. « Monitoring and modelling direct atmospheric formaldehyde measurements ». Thesis, University of Leeds, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436382.

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Aaltonen, Jaana. « Ground Monitoring using Resistivity Measurements in Glaciated Terrains ». Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3177.

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CAMERINI, MURILO GIRON. « FLEXIBLE RISERS MONITORING TECHNIQUE BASED ON VIBRATION MEASUREMENTS ». PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2012. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=20697@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
Um dos principais mecanismos de falha em risers flexíveis é o rompimento de arames da armadura de tração. A experiência tem mostrado que esta classe de dano tende a surgir primariamente na parte emersa do riser, próximo à sua terminação. A ruptura dos arames ocorre de forma progressiva, podendo ser causada por diferentes processos, tais como corrosão pelo ingresso de fluido no espaço anular entre capa e armadura, desgaste excessivo associado com o contato e atrito entre arames adjacentes ou entre as diferentes camadas metálicas da armadura, ou mesmo a presença de níveis elevados de tensões produzidas pelos carregamentos mecânicos aos quais o riser é submetido durante a operação. O deterioramento progressivo pode dar origem a defeitos localizados que agem como concentradores de tensão e levam o arame à ruptura através de um processo de fadiga. O duto flexível é capaz de manter-se em operação mesmo com alguns dos arames de suas armaduras rompidos, porém uma sequencia de rupturas pode levar à ocorrência de vazamentos ou mesmo a falhas catastróficas. O monitoramento contínuo em tempo real é uma das principais alternativas para evitar que o dano progressivo nas armaduras do riser resulte em acidentes com severas consequências econômicas e ambientais. As técnicas de monitoramento da integridade de risers flexíveis podem ser classificadas como diretas, onde é possível identificar diretamente a existência de um dano/falha, ou indiretas, em que o sistema de sensoriamento registra indicações secundárias, possivelmente consequência da falha. Esta dissertação relata o desenvolvimento de um sistema de monitoramento baseado em vibrações. Trata-se de uma técnica indireta baseada em eventos, onde no momento da ruptura do arame um sinal de vibração, distinto tanto na frequência quanto na amplitude, é detectado por acelerômetros instalados na capa polimérica externa do riser. No trabalho, são apresentados resultados de quatro ensaios em escala real que demonstraram a viabilidade do sistema para um primeiro teste de campo. Estratégias de instrumentação dos dutos e as variações dos sinais detectados são apresentadas e discutidas. Os resultados mostraram que a resposta vibratória do sinal de ruptura apresenta características específicas, garantindo uma boa confiabilidade na detecção. Porém, em se tratando de uma técnica indireta, verifica-se que quando dois sistemas de monitoramento de naturezas complementares são empregados em conjunto, as probabilidades de detecção dos eventos de rupturas aumentam significativamente.
The main failure in flexible risers is the disruption of the wires from the tensile armor layer. Experience has shown that this class of damage occurs primarily near to the top riser connector. The breaking of the wires occurs gradually and may be caused by different processes as corrosion by inflow of fluid in the annular space, excessive wear associated with the contact and friction between adjacent wires or between different riser layers. The progressive deterioration can lead to localized defects that act as stress concentrators and may break the wire from the tensile armor layer through a fatigue process. The flexible pipe is able to remain in operation even with some broken wires, but a sequence of ruptures can conduce to a catastrophic failure. Real time continuous monitoring is one of the main alternatives to prevent progressive wire damage results in an accident with severe economic and environmental consequences. This thesis describes the development of a monitoring system based on vibrations. This is an indirect technique based on events, where in the moment of the wire break, one vibration signal is registered. This signal can be distinguished both in frequency and amplitude and detected by accelerometers installed on the polymeric outer layer of the riser. We present results of four tests in real scale that demonstrated the viability of the system for an initial field test. Instrumentation strategies in riser and the variations of the signals detected are presented and discussed. The results showed that the vibrational signal has specific characteristics ensuring good detection reliability.

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Halén, Axel. « Cloud Monitoring and observation measurements in OpenStack environment ». Thesis, Luleå tekniska universitet, Datavetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70896.

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Gerrard, Carl Andrew. « Remote monitoring of power system conductor voltages ». Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263990.

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Hamilton, Ruth Munro. « Cardiorespiratory measurements using inspired oxygen sinusoids ». Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301515.

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Lindh, Thomas. « Performance monitoring in communication networks ». Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3724.

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Performance monitoring in communication networks, which isthe main topic of this thesis, is an essential part ofperformance and network management. The applications cover anumber of different areas such as daily operations andmaintenance, usage information for billing purposes, customerreports, traffic control, planning, and dimensioning.

The main purpose of the thesis is to develop a single methodfor measurement of the most significant network performanceparameters in IP networks. It is a continuation from a previouslicentiate thesis that focused on performance monitoring incell-based networks.

The development of a measurement method that combines activeand passive approaches using monitoring blocks is the maincontribution of this work. A traffic flow performance meterbased on these principles has been implemented as an extensionto the open source flow meter NeTraMet and tested. Theresolution and precision of the results are determined by thesize of the monitoring block, which is the methods mainparameter. Relevant statistical issues regarding packet lossesand delays are analysed. Finally, the measurement method isdiscussed in the context of applications, as well as networkand service management systems in general.

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Livres sur le sujet "Measurements and monitoring"

Hoover, Coeli M., dir. Field Measurements for Forest Carbon Monitoring. Dordrecht : Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-8506-2.

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Peter, Rolfe, dir. Fetal physiological measurements : Proceedings of the Second International Conference on Fetal and Neonatal Physiological Measurements. London : Butterworths, 1986.

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M, Myers, dir. Physiological measurements with radionuclides in clinical practice. Oxford : Oxford University Press, 1998.

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Committee, International Radio Consultative. Handbook for monitoring stations. Geneva : International Telecommunication Union, 1988.

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Babak, Vitaliy P., Serhii V. Babak, Volodymyr S. Eremenko, Yurii V. Kuts, Mykhailo V. Myslovych, Leonid M. Scherbak et Artur O. Zaporozhets. Models and Measures in Measurements and Monitoring. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70783-5.

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Barnes, Erik R. Stream discharge monitoring in Whatcom County, WA. Bellingham, Wash : Huxley College of Environmental Studies, Western Washington University, 1999.

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Monitoring education : Indicators, quality, and effectiveness. London : Cassell, 1996.

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Schumacher, N. Hydrologic and sediment monitoring of watersheds in India : A field manual. New Delhi : Indo-German Bilateral Project "Watershed Management", 2004.

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Montana Bureau of Mines and Geology et Geological Survey (U.S.), dir. Records of water levels in monitoring wells in the Gallatin Valley, southwestern Montana, 1947-93. Helena, Mont : U.S. Dept. of the Interior, U.S. Geological Survey, 1995.

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Nilsson, Elisabeth. Klimatmätningar vid Jädraås Försökspark 1992-1993, samt miljömätningar 1991-1993 = : Climatic measurements at Jädraås Research Station 1992-1993, and environmental measurements 1991-1993. Uppsala : Sveriges lantbruksuniversitet, Institutionen för ekologi och miljövård, 1994.

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Chapitres de livres sur le sujet "Measurements and monitoring"

Magder, Sheldon. « Basics of Hemodynamic Measurements ». Dans Cardiopulmonary Monitoring, 319–36. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73387-2_22.

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Agostini, Franck, Elisa Franzoni, Kurt Kielsgaard Hansen, Hemming Paroll et Lars-Olof Nilsson. « Monitoring, Remote Measurements ». Dans Methods of Measuring Moisture in Building Materials and Structures, 237–49. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74231-1_26.

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Scardi, Michele, Lorenzo Tancioni et Stefano Cataudella. « Monitoring Methods Based on Fish ». Dans Water Quality Measurements, 135–53. Chichester, UK : John Wiley & Sons, Ltd, 2006. http://dx.doi.org/10.1002/0470863781.ch8.

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Monnet, Xavier, et Jean-Louis Teboul. « Measurements of Fluid Requirements with Cardiovascular Challenges ». Dans Cardiopulmonary Monitoring, 405–17. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73387-2_27.

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Lee, Seung-Bok, Gwi-Nam Bae et Kil-Choo Moon. « Smog Chamber Measurements ». Dans Atmospheric and Biological Environmental Monitoring, 105–36. Dordrecht : Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9674-7_8.

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Benson, Richard C., et Lynn B. Yuhr. « Engineering Measurements and Monitoring ». Dans Site Characterization in Karst and Pseudokarst Terraines, 265–73. Dordrecht : Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-9924-9_20.

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Ancellet, Gérard, et Matthias Beekmann. « Ozone Monitoring and Measurements ». Dans Tropospheric Ozone Research, 207–306. Berlin, Heidelberg : Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-58729-0_8.

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Mensky, Michael B. « The Monitoring of Energy ». Dans Quantum Measurements and Decoherence, 145–60. Dordrecht : Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9566-7_7.

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Leiza, Jose R., et Timothy McKenna. « Calorimetry, Conductivity, Densimetry, and Rheological Measurements ». Dans Monitoring Polymerization Reactions, 135–50. Hoboken, NJ : John Wiley & Sons, 2014. http://dx.doi.org/10.1002/9781118733813.ch7.

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Sandin, Leonard, et Nikolai Friberg. « Biological Monitoring of North European Rivers ». Dans Water Quality Measurements, 277–93. Chichester, UK : John Wiley & Sons, Ltd, 2006. http://dx.doi.org/10.1002/0470863781.ch15.

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Actes de conférences sur le sujet "Measurements and monitoring"

BULL, L. A., K. WORDEN et N. DERVILIS. « Damage Classification Using Labelled and Unlabelled Measurements ». Dans Structural Health Monitoring 2019. Lancaster, PA : DEStech Publications, Inc., 2019. http://dx.doi.org/10.12783/shm2019/32484.

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CHEN, JUSTIN, NEAL WADHWA, ABE DAVIS, FREDO DURAND, WILLIAM FREEMAN et ORAL BUYUKOZTURK. « Long Distance Video Camera Measurements of Structures ». Dans Structural Health Monitoring 2015. Destech Publications, 2015. http://dx.doi.org/10.12783/shm2015/385.

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GRAVES, WILLIAM, et DAVID LATTANZI. « FULL-SCALE DEFORMATION FIELD MEASUREMENTS VIA PHOTOGRAMMETRIC REMOTE SENSING ». Dans Structural Health Monitoring 2021. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/shm2021/36298.

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3D remote sensing technologies have improved dramatically over the past five years and methods such as laser scanning and photogrammetry are now capable of reliably resolving geometric details on the order of one millimeter or less. This has significant impacts for the structural health monitoring community, as it has expanded the range of mechanics-driven problems that these methods can be employed on. In this work, we explore how 3D geometric measurements extracted from photogrammetric point clouds can be leveraged for structural analysis and measurement of structural deformations without physically contacting the target structure. Here we present a non-destructive evaluation technique for extracting and quantifying structural deformations as applied to a load test on a highway bridge in Delaware. The challenging nature of 3D point cloud data means that statistical methods must be employed to adequately evaluate the deformation field of the bridge. Overall, the results show a direct pathway from 3D imaging to fundamental mechanical analysis with measurements that capture the true deformation values typically within one standard deviation. These results are promising given that the mid-span deformation of the bridge for the given load test is on the scale of only a few millimeters. Future work for this method will also investigate using these results for updating finite element models.

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Thomas, Michael E., Marc B. Airola et Jessica K. Makowski. « pectrally resolved infrared sea surface pyrometric measurements ». Dans Ocean Sensing and Monitoring X, sous la direction de Weilin "Will" Hou et Robert A. Arnone. SPIE, 2018. http://dx.doi.org/10.1117/12.2305424.

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Duchnowski, Robert, et Patrycja Wyszkowska. « Point displacements during classical measurements – a practical approach to pseudo epochs between measurements ». Dans 5th Joint International Symposium on Deformation Monitoring. Valencia : Editorial de la Universitat Politècnica de València, 2022. http://dx.doi.org/10.4995/jisdm2022.2022.13678.

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Résumé :

Various measurement techniques and data processing are applied to determine point displacements and deformation of geodetic networks or buildings. Considering classical measurements and analysis of the network deformation, we should realize that the measurements are not “immediate.” The question arises: what happens if a point (or some points) displaces between particular measurements within one epoch. In such a case, the observation set would consist of the observations before and after point displacement, and such hypothetical observation groups can be regarded as related to two (or more) pseudo epochs. The paper's main objective is to examine some estimation methods that would probably deal with such a problem, namely Msplit estimation (in two variants, the squared and the absolute Msplit estimation) and chosen robust methods, namely Huber’s method (example M-estimation) and the Hodges-Lehmann weighted estimation (basic R-estimation). The first approach can provide two (or more) variants of the network point coordinates (here, before and after point movements), providing information about two (or more) states of the network during measurements. In contrast, the robust methods can only decrease the influence of the outliers on the computed network point coordinates. Thus, estimation results would concern only one network state in such a case. The presented empirical analyses show that the better and more realistic results are obtained by applying Msplit estimation. Huber’s method can also provide acceptable results (describing the network state at the epoch beginning) only if the number of observations conducted after the point displacements is not too high.

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FONG, FREDRIC, MASON GHAFGHAZI et FAE AZHARI. « Evaluation of Commercially Available Sensors for Soil Stress Measurements ». Dans Structural Health Monitoring 2019. Lancaster, PA : DEStech Publications, Inc., 2019. http://dx.doi.org/10.12783/shm2019/32236.

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MESNIL, OLIVIER, HAO YAN, MASSIMO RUZZENE, KAMRAN PAYNABAR et JIANJUN SHI. « Guided Wavefield Reconstruction from Sparse Measurements Using Compressed Sensing ». Dans Structural Health Monitoring 2015. Destech Publications, 2015. http://dx.doi.org/10.12783/shm2015/232.

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NYIKAYARAMBA, GIFT, et BORIS MURMANN. « Towards On-Chip Measurement of S-Parameters for Ultrasonic Guided-Wave SHM : Damage Localization in Aluminum Using S-Parameter Measurements ». Dans Structural Health Monitoring 2019. Lancaster, PA : DEStech Publications, Inc., 2019. http://dx.doi.org/10.12783/shm2019/32246.

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Chavarria, J. « Reservoir Monitoring Through DAS Measurements ». Dans 80th EAGE Conference & Exhibition 2018 Workshop Programme. Netherlands : EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201801916.

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« OThX - Measurements and performance monitoring ». Dans 2005 Optical Fiber Communications Conference Technical Digest. IEEE, 2005. http://dx.doi.org/10.1109/ofc.2005.193048.

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Rapports d'organisations sur le sujet "Measurements and monitoring"

Allendorf, S., D. Ottesen, H. Johnson et D. Lambert. Process monitoring and control : Ammonia measurements in off-gases. Office of Scientific and Technical Information (OSTI), mai 1997. http://dx.doi.org/10.2172/552756.

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Morrison, H. F., A. Becker et K. H. Lee. Measurements of electrical conductivity for characterizing and monitoring nuclear waste repositories. Office of Scientific and Technical Information (OSTI), novembre 1986. http://dx.doi.org/10.2172/6691260.

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Lee, Ki Ha, Alex Becker, Hung-Wen Tseng et Youngki Choi. High-Frequency Electromagnetic Impedance Measurements for Characterization, Monitoring and Verification Efforts. Office of Scientific and Technical Information (OSTI), juin 2001. http://dx.doi.org/10.2172/834455.

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Lee, Ki Ha, Alex Becker et Hung-Wen Tseng. High-Frequency Electromagnetic Impedance Measurements for Characterization, Monitoring and Verification Efforts. Office of Scientific and Technical Information (OSTI), novembre 2002. http://dx.doi.org/10.2172/834460.

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Lee, Ki Ha, Alex Becker et William Framgos. High Frequency Electromagnetic Impedance Measurements for Characterization, Monitoring and Verification Efforts. Office of Scientific and Technical Information (OSTI), juin 1999. http://dx.doi.org/10.2172/829932.

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Lee, Ki Ha, et Alex Becker. High-Frequency Electromagnetic Impedance Measurements for Characterization, Monitoring, and Verification Efforts. Office of Scientific and Technical Information (OSTI), juin 2000. http://dx.doi.org/10.2172/829933.

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Lee, Ki Ha, et Alex Becker. High Frequency Electromagnetic Impedance Measurements For Characterization, Monitoring And Verification Efforts. Office of Scientific and Technical Information (OSTI), décembre 2000. http://dx.doi.org/10.2172/829953.

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Crowley, J. W. Monitoring groundwater changes in southern Ontario using GRACE satellite gravity measurements. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2019. http://dx.doi.org/10.4095/313577.

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Phadke, A. G., et J. S. Thorp. Monitoring and simulating real-time electric power system operation with phasor measurements. Office of Scientific and Technical Information (OSTI), janvier 1995. http://dx.doi.org/10.2172/10125609.

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