Temperature and pressure measurement based on tunable diode laser absorption spectroscopy with gas absorption linewidth detection

Yunxia Meng; Tiegen Liu; Kun Liu; Junfeng Jiang; Tao Wang; Ranran Wang

doi:10.1117/12.2073852

17 November 2014 Temperature and pressure measurement based on tunable diode laser absorption spectroscopy with gas absorption linewidth detection

Yunxia Meng, Tiegen Liu, Kun Liu, Junfeng Jiang, Tao Wang, Ranran Wang

Author Affiliations +

Proceedings Volume 9274, Advanced Sensor Systems and Applications VI; 927423 (2014) https://doi.org/10.1117/12.2073852
Event: SPIE/COS Photonics Asia, 2014, Beijing, China

Abstract

A gas temperature and pressure measurement method based on Tunable Diode Laser Absorption Spectroscopy (TDLAS) detecting linewidth of gas absorption line was proposed in this paper. Combined with Lambert-Beer Law and ideal gas law, the relationship between temperature, pressure and gas linewidth with Lorentzian line shape was investigated in theory. Taking carbon monoxide (CO) at 1567.32 nm for example, the linewidths of gas absorption line in different temperatures and pressures were obtained by simulation. The relationship between the linewidth of second harmonic and temperature, pressure with the coefficient 0.025 pm/K and 0.0645 pm/kPa respectively. According to the relationship of simulation results and detected linewidth, the undefined temperature and pressure of CO gas were measured. The gas temperature and pressure measurement based on linewidth detection, avoiding the influence of laser intensity, is an effective temperature and pressure measurement method. This method also has the ability to detect temperature and pressure of other gases with Lorentzian line shape.

Citation Download Citation

Yunxia Meng, Tiegen Liu, Kun Liu, Junfeng Jiang, Tao Wang, and Ranran Wang "Temperature and pressure measurement based on tunable diode laser absorption spectroscopy with gas absorption linewidth detection", Proc. SPIE 9274, Advanced Sensor Systems and Applications VI, 927423 (17 November 2014); https://doi.org/10.1117/12.2073852

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