Research on dynamic calibration and dynamic compensation of K-type thermocouple

Feng, Hao; Zhao, Chenyang; Xie, Yani; Wang, Wenlian; Zhang, Xia; Zhang, Zhijie

doi:10.1109/i2mtc.2014.6860750

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…With the reference temperature compensated, the main test error is from the dynamic response of the thermocouple. The time constant of the K-type thermocouple was measured to be 20 ± 0.1 ms by a laser whose rising time was nanosecond-level [15]. The temperature to be measured is second-level, so the dynamic characteristic of the thermocouple used is enough for this experiment.…”

Section: Methodsmentioning

confidence: 99%

Study on the thermal initiation of shelled PBXN-109 under laser irradiation

Ding¹,

Zhao²,

Zhang³

et al. 2019

Laser Phys.

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In order to investigate the thermal initiation mechanism of a warhead under laser irradiation, small scale experiments have been carried out with shelled PBXN-109 to obtain the initiation time and critical metal temperature. It was found that, as the laser power increases, the initiation time decreases exponentially; while the critical metal temperature increases linearly due to the effect of thermal conduct resistance. Based on theoretical analysis, a prediction model was built with a good accuracy for engineering application. In order to establish the relationship between the small-scale and the full-scale experiments, the scaling law of the thermal response process was approximated with that of the thermal conduct process, which was deduced through equation analysis to avoid the difficulty brought by the exponential nonlinearity from the equation of the thermal decomposition of the explosive.

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Section: Methodsmentioning

confidence: 99%

Study on the thermal initiation of shelled PBXN-109 under laser irradiation

Ding¹,

Zhao²,

Zhang³

et al. 2019

Laser Phys.

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“…Garinei and Tagliaferri used a high brilliance laser diode heating system to generate both step change and ramp change in temperature so as to measure the dynamic response of the sensor. Hao et al and Feng et al established the transient high surface temperature dynamic calibration system using high power laser and put forward the traceable dynamic calibration process. This method is complicated, and the infrared detector needs to be statically calibrated by means of calibrated thermocouple.…”

Section: Introductionmentioning

confidence: 99%

Dynamic calibration method of temperature sensor based on Quasi‐δ pulse temperature excitation

Zhang

Hao

et al. 2017

Micro & Optical Tech Letters

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Aiming at the existing problems in the dynamic calibration method of temperature sensor, Quasi‐δ pulse temperature dynamic calibration method is proposed. The Quasi‐δ pulse dynamic calibration principle was described, the characteristics of Quasi‐δ pulse function were analyzed, and the relationship among pulse width of Quasi‐δ signal, frequency range that can be calibrated, and calibration precision was obtained. Quasi‐δ pulse temperature dynamic calibration system was built using the laser as the heat source which generates the excitation temperature required for dynamic calibration. In the system, optical focusing system was designed using ellipsoidal mirror which has a better conjugate imaging property. Applying the dynamic calibration system, a K‐type armored thermocouple was calibrated dynamically, and mathematical model of the calibrated thermocouple was established by generalized least squares method based on a special whitening filter. Dynamic characteristics of the thermocouple in time domain and frequency domain were analyzed.

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“…Serio B. and Hao X.J. et al [7][8][9][10][11] used high-power laser to generate a rapid temperature rise on the thermocouple surface and obtained the time constant. In addition, there are other methods for dynamic excitation and calibration of thermocouple [12][13][14][15].In the measurement methods and systems for time constant, how to produce stable temperature field and step excitation is the main research content when the system is established.…”

mentioning

confidence: 99%

A Measurement System for Time Constant of Thermocouple Sensor Based on High Temperature Furnace

Zhang

Hao

et al. 2018

Applied Sciences

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In dynamic temperature measurement, thermocouple sensors are widely used, and their dynamic characteristics directly affect the accuracy of the test results. So before applying thermocouple sensors to dynamic temperature measurement, their dynamic characteristics should be obtained, and their dynamic performance parameters should be analyzed. The time constant is the most important dynamic parameter, which reflects the response speed of a thermocouple sensor. Therefore, it is necessary to measure the time constant. The time constant is closely related to the heat transfer mode, so the heat transfer environment of the time constant measurement system should be similar to the application environment of thermocouple sensor. When using the thermocouple to measure the temperature in various kilns, the heat transfer is mainly through the radiative mode, and existing equipment, such as constant temperature water/oil tank, shock wave tube and other devices, cannot be used to measure the time constant to reflect scenarios in actual measurement applications. Therefore, this paper proposed a new method to measure the time constant of the thermocouple by improved high temperature furnace. In the system, the high temperature furnace was used to generate the stable temperature field, and the fast feed device was used to insert the thermocouple into the high temperature furnace and generates the ramp temperature excitation. The temperature can reach 1500 • C in the furnace, and the temperature error in uniform temperature field is ±1 • C. Finally, the time constant of a K-type thermocouple was measured, and the uncertainty of the measurement result was analyzed.2 of 12 transfer mode. At present, there are many kinds of measurement methods and devices of time constant, such as constant temperature water/oil tank, hot wind tunnel, shock tube, laser, and so on.Stable temperature fields in water flow and airflow environments are generated by constant temperature water/oil tank and hot wind tunnel respectively. The thermocouple is inserted into the stable flow field rapidly, and the thermocouple is excited by step temperature. The time constant is obtained by the thermocouple response. Xiong J. and Wang X.N. [1,2] measured the response time and delay time of the thermocouple by constant temperature water/oil tank, and the dynamic error was corrected. Zhao S.A. [3] developed a hot wind tunnel with the temperature range from 1000 • C to 1700 • C, and the step response of the thermocouple was obtained. Shock tube is used to generate step pressure, which is usually used for dynamic calibration of pressure sensors. After breaking the film, the gas in the high pressure chamber compresses the gas in the low pressure chamber to produce the shock wave. The step pressure is generated on the pressure sensor by the shock wave and used to excite the pressure sensor. At the same time, due to the gas compression, there is also a temperature step behind the shock wave, which can be used to excite the thermocouple. Meng X.F. et al. [4,5] modified ...

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Research on dynamic calibration and dynamic compensation of K-type thermocouple

Cited by 7 publications

References 4 publications

Study on the thermal initiation of shelled PBXN-109 under laser irradiation

Study on the thermal initiation of shelled PBXN-109 under laser irradiation

Dynamic calibration method of temperature sensor based on Quasi‐δ pulse temperature excitation

A Measurement System for Time Constant of Thermocouple Sensor Based on High Temperature Furnace

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