铠装热电偶动态响应校准过程数值研究

doi:10.3969/j.issn.1000-1158.2022.12.11

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Abstract Time constant is one of the important parameters for temperature sensor`s dynamic response. Because the calibration conditions usually can`t cover the temperature sensors service conditions, the dynamic responses of a sheathed thermocouple under plunge test and loop current step response (LCSR) test were numerically simulated by the finite volume method. Three-dimensional structure models of the thermocouple with protective tube, insulating layer and sensing layer were established. The dynamic responses of the thermocouple with different MgO ratio in the insulating layer were analyzed. The results show that the time constants obtained by fitted and transformed LCSR data with the equation of three poles agree well with the time constants obtained by the plunge test, and the deviations are less than 10%. These provide a new method for the design and calibration of the fast response sheathed thermocouples.

Key words： metrology thermocouple time constant dynamic response calibration numerical simulation

Received: 18 August 2021 Published: 28 December 2022

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TB942

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	Articles by authors
	LIU Bo
	ZHENG Wei
	WANG Zhi-yuan
	LI Xue-jing

Cite this article:

LIU Bo,ZHENG Wei,WANG Zhi-yuan, et al. Numerical Simulation for the Dynamic Response Calibration of the Sheathed Thermocouple[J]. Acta Metrologica Sinica, 2022, 43(12): 1593-1597.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2022.12.11 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2022/V43/I12/1593

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