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Calibration device for thermocouple response time constant based on gas temperature step method
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Ran JIN1, Yuqi HUANG1, 1, Liang ZHU2
Metrology & Measurement Technology | 2025, 45(6) : 86 - 94
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Metrology & Measurement Technology | 2025, 45(6): 86-94
• Sensor Technology •
Calibration device for thermocouple response time constant based on gas temperature step method
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Ran JIN1, Yuqi HUANG1, 1, Liang ZHU2
Affiliations
  • 1Guizhou Aerospace Institute of Measuring and Testing Technology, Guiyang 550000, China
  • 2Guizhou Normal University, Guiyang550000, China
Published: 2025-12-28 doi: 10.11823/j.issn.1674-5795.2025.06.07
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To address the calibration demand for the response time constant of fast⁃response K⁃type thermocouples under gas medium conditions, a calibration device based on the gas temperature step method was developed. Key para⁃meters including heater power, orifice area, and nozzle flow rate were determined via theoretical calculations, and Ansys Fluent software was utilized for simulation to optimize the structure of the step temperature generation module. A calibration method based on synchronous dynamic pressure monitoring was proposed, which takes the pressure step moment as the reference to eliminate non⁃ideal excitation interference and ensure the calculation accuracy of the response time constant. Experimental tests were conducted using the developed device, and the results indicate that the gas temperature step amplitude generated by the device exceeds 200 ℃ with a temperature step excitation time of approximately 2.2 ms. The device can effectively calibrate the response time constant of K⁃type thermocouples with different wire diameters, demonstrating a significant engineering application value.

gas temperature step method  /  thermocouple  /  response time constant  /  calibration device  /  step amplitude  /  excitation time  /  simulation analysis  /  waveform test
Ran JIN, Yuqi HUANG, Liang ZHU. Calibration device for thermocouple response time constant based on gas temperature step method[J]. Metrology & Measurement Technology, 2025 , 45 (6) : 86 -94 . DOI: 10.11823/j.issn.1674-5795.2025.06.07
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Year 2025 volume 45 Issue 6
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Article Info
doi: 10.11823/j.issn.1674-5795.2025.06.07
  • Receive Date：2025-10-14
  • Online Date：2026-04-09
  • Published：2025-12-28
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  • Received：2025-10-14
  • Revised：2025-11-10
Affiliations
    1Guizhou Aerospace Institute of Measuring and Testing Technology, Guiyang 550000, China
    2Guizhou Normal University, Guiyang550000, China
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