Measurement method of thermocouple time constant based on fast laser constant temperature zone

HAO Xiaojian; LIU Tingjian

doi:10.7510/jgjs.issn.1001-3806.2019.06.010

LASER TECHNOLOGY > 2019 > 43(6): 784-788. > DOI: 10.7510/jgjs.issn.1001-3806.2019.06.010

HAO Xiaojian, LIU Tingjian. Measurement method of thermocouple time constant based on fast laser constant temperature zone[J]. LASER TECHNOLOGY, 2019, 43(6): 784-788. DOI: 10.7510/jgjs.issn.1001-3806.2019.06.010

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Measurement method of thermocouple time constant based on fast laser constant temperature zone

HAO Xiaojian^1,2,,
LIU Tingjian^1,2

1.
National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, China
2.
Key Laboratory of Instrumentation Science & Dynamic Measurement of Ministry of Education, North University of China, Taiyuan 030051, China

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Received Date: December 28, 2018
Revised Date: February 26, 2019
Published Date: November 24, 2019

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Abstract

Abstract

In order to solve the step temperature problem during test of thermocouple time constant, fuzzy control algorithm was used to feedback control the laser output power, a new parameter adaptive fuzzy proportion-integration-differentiation control algorithm was implemented and the hardware of closed-loop control system was analyzed. The experimental results show that, the time constant data of K-type thermocouple is 421.1ms. The algorithm can effectively shorten the balance time and enhance the anti-interference ability of the temperature control system. This research is helpful for the calibration research of thermocouples, and has certain engineering reference and application value.
- measurement and metrology,
- time constant test,
- fuzzy control,
- thermocouple,
- fuzzy proportion-integration-differentiation,
- closed-loop control

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