Author:
Chang Zijun,Liu Qingming,Shen Yang
Abstract
Abstract
The measurement of gas temperature and concentration in combustion process has always been an important part of research. Based on the application of tunable diode laser technology in gas detection, the molecular absorption spectroscopy system was established and the concentration and temperature of water vapor were measured. Based on the spectral parameters in the latest HITRAN 2016 database, a group of programs have been compiled, which adopt the form of VOIGT function and consider frequency shift caused by pressure and temperature and . The spectral absorbance of H2O was obtained by the computer program. Based on the scanning range of the laser, the spectral lines of water vapor molecule near 1392 nm were screened to obtain the suitable pairs of spectral lines for measuring temperature and concentration. The pairs of spectral lines were validated as gas temperature measurements at high temperature by numerical simulation. TDLAS system is built independently, and TDLAS technology is used to measure the gas concentration field and temperature field in an experimental way. It is of great significance for TDLAS technology in gas monitoring.
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