Relationship Between Dynamic Coefficients of Two Temperature Sensors Under Nonstationary Flow Conditions

Jamróz, P.

doi:10.1109/jsen.2010.2073463

Cited by 9 publications

(4 citation statements)

References 19 publications

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“…Various materials may be used to increase the resistance of the sensor, but this may change other characteristics such as the bandwidth of the measurement system. The analysis of various models of temperature sensors (wires) is presented in [ 15 ].…”

Section: Correlative Methods Of Measuring Flow Velocitymentioning

confidence: 99%

Two Wire Sensor for Measuring the Velocity of Non-Isothermal Flows

Socha

Jamróz

2021

Sensors

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Changes in the temperature of the medium significantly affect the static characteristics of hot-wire anemometry measuring wires, which causes errors in the results of flow velocity measurements. High temperatures of the medium make it necessary to additionally heat the sensor to even higher temperatures, which may lead to its damage due to wire burnout. The article proposes a solution to the problem of measuring the flow velocity in conditions of non-stationary temperatures with the use of the method of cross-correlation of signals from two-wire resistance thermometers. The main assumptions of the method and its experimental verification were presented.

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Section: Correlative Methods Of Measuring Flow Velocitymentioning

confidence: 99%

Two Wire Sensor for Measuring the Velocity of Non-Isothermal Flows

Socha

Jamróz

2021

Sensors

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“…A detailed analysis of the wire's dynamics under various flow conditions suggests its huge changes depending on flow velocity. Studies of dynamics of thermoresistant wire elements are still under way and obtained results allow for development of complex systems for correction of dynamic errors acquired during temperature measurements [12][13][14][15].…”

Section: Dynamic Properties Of the Hot-wire Anemometric Systemsmentioning

confidence: 99%

A Hot-Wire Anemometer with Automatically Adjusted Dynamic Properties for Wind Energy Spectrum Analysis

Ligęza

Jamróz

2022

Energies

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Hot-wire anemometric measurements are often related to the determination of flow parameters in a high frequency range. Such knowledge is particularly important when analyzing the flow phenomena in the vicinity of wind turbines. The reliability of obtained results is determined by the knowledge of the properties of the system used for measurements. It concerns both the static and dynamic characteristics of individual measurement channels. In studies of hot-wire anemometric systems, a problem related to the unstable transmission bands of such systems and their high dependence on measurement conditions and the system configuration itself has been commonly indicated. This paper presents the results of an investigation of a new type of hot-wire anemometer, allowing for automatic adjustment of its dynamic characteristics under real working conditions. The presented system is dedicated to the analysis of the wind energy spectrum in experimental laboratory tests on reduced-scale models and to specialized in situ measurements.

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“…The response of the hot-wire anemometric system concerns not only the reaction of the sensor itself to changing flow conditions, but also the reaction of the entire measurement system. The system's dynamics is related not only to physical properties of measuring wire (Jamróz, 2008(Jamróz, , 2011 and its operational conditions, but also to characteristics of the apparatus itself, such as electronic parameters of measuring channel and the way in which the signals are brought to/from the measurement probe. Therefore it is necessary that the whole signal processing line be subject to dynamic analysis.…”

Section: Dynamic Properties Of Hot-wire Anemometric Measurement Systemsmentioning

confidence: 99%

Dynamic properties of hot-wire anemometric measurement circuits in the aspect of measurements in mine conditions / Właściwości dynamiczne termoanemometrycznych układów pomiarowych w aspekcie pomiarów w warunkach kopalnianych

Jamróz¹,

Ligęza²,

Socha³

2012

Archives of Mining Sciences

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The use of measurement apparatus under conditions which differ significantly from those under which the apparatus was adjusted carries the risk of altering the previously determined measurement characteristics. This is of special concern in the case of apparatus which is sensitive to external measurement conditions. Advanced measurement systems are equipped with algorithms which allow the negative effect of unstable environmental conditions on their static characteristics to be compensated for. Meanwhile, the problem of altered dynamic properties of such systems is often neglected. This paper presents a model study in which the effect of variable operational conditions on dynamic response of hot-wire anemometric measurement system in the case of simulated mine flows was investigated. A mathematical model of measurement system able to compensate the negative effect of changes in flow velocity and configuration of measurement apparatus itself on its dynamic properties was developed and investigated. Based on conducted experiments, we have developed an automatic regulation algorithm enabling the transmission band of measurement apparatus to be optimized for measurement conditions prevailing in mine environment.Keywords: measurements of flow phenomena, transmission band, limiting frequency, hot-wire anemometric measurement systems Stosowanie aparatury pomiarowej w warunkach różnych od warunków, w których aparatura ta była adjustowana niesie ze sobą ryzyko zmian wyznaczonych wcześniej charakterystyk pomiarowych. Dotyczy to w szczególności aparatury wrażliwej na zewnętrzne czynniki pomiarowe. Zaawansowane systemy pomiarowe wyposaża się w algorytmy pozwalające na kompensację negatywnego oddziaływania zmiennych warunków środowiskowych głównie na charakterystyki statyczne. Pomija się często przy tym problem zmian właściwości dynamicznych systemów. W artykule przedstawiono modelowe badania wpływu zmiennych warunków użytkowania na odpowiedź dynamiczną termoanemometrycznego systemu pomiarowego w warunkach pomiarów symulowanych przepływów kopalnianych. Opracowano i przebadano symulacyjnie matematyczny model układu pomiarowego zdolnego do kompensacji negatywnego wpływu zmian prędkości przepływu oraz konfiguracji aparatury pomiarowej na jej właściwości dynamiczne. Na podstawie przeprowadzonych badań stworzono algorytm automatycznej regulacji pozwalający na optymalizację pasma przenoszenia aparatury pomiarowej w warunkach pomiarów w środowisku kopalnianym.Słowa kluczowe: pomiary zjawisk przepływowych, pasmo przenoszenia, częstotliwość graniczna, termoanemometryczne układy pomiarowe

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Relationship Between Dynamic Coefficients of Two Temperature Sensors Under Nonstationary Flow Conditions

Cited by 9 publications

References 19 publications

Two Wire Sensor for Measuring the Velocity of Non-Isothermal Flows

Two Wire Sensor for Measuring the Velocity of Non-Isothermal Flows

A Hot-Wire Anemometer with Automatically Adjusted Dynamic Properties for Wind Energy Spectrum Analysis

Dynamic properties of hot-wire anemometric measurement circuits in the aspect of measurements in mine conditions / Właściwości dynamiczne termoanemometrycznych układów pomiarowych w aspekcie pomiarów w warunkach kopalnianych

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