A correction method for steady temperature measurement with dual thermocouples

Luqiang Li; Yujia Song; Peiyong Wang

doi:10.1117/12.3030545

5 June 2024 A correction method for steady temperature measurement with dual thermocouples

Luqiang Li, Yujia Song, Peiyong Wang

Proceedings Volume 13163, Fourth International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2024); 131631R (2024) https://doi.org/10.1117/12.3030545
Event: International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2024), 2024, Xi'an, China

Abstract

When a thermocouple is used to measure the temperature of a gas flow, the reading is the thermocouple bead temperature, but the bead temperature, resulting from the energy balance among the thermocouple, the gas, and the surrounding environment, is not equal to the gas temperature. The energy conservation of the bead can be used to obtain an accurate gas temperature. However, when the gas velocity is unknown, two thermocouples with different sizes must be used to get two different readings, which can be used to obtain the gas velocity and temperature simultaneously. The basic principle of this correction method is stated first, and it is used in the temperature and velocity measurement of a standard Hencken flame with known temperature and velocity. The correction error for the velocity is 36.6%, and that for the temperature is 2%. The sensitivity of the correction accuracy to the uncertainties of the gas composition, bead diameter and thermocouple emissivity is also analyzed. When the gas composition is changed to pure N₂, the velocity and temperature errors are 78.8% and 1.6%, respectively. With a 10% bead diameter uncertainty, the relative errors of the corrected velocity and temperature are 75.9% and -4% at most. The best case with a 10% uncertainty for emissivity is a 1% error in temperature.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Luqiang Li, Yujia Song, and Peiyong Wang "A correction method for steady temperature measurement with dual thermocouples", Proc. SPIE 13163, Fourth International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2024), 131631R (5 June 2024); https://doi.org/10.1117/12.3030545

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