Measurements of CO2 Temperature and Concentration in High Temperature Environment Based on Mutable Diode Laser Absorption Spectroscopy

Based on tunable diode laser absorption spectroscopy technique, the measurement method of CO2 temperature and concentration in high temperature environment is studied. The CO2 absorption line near 1996 cm(-1) is selected as the target detection line to measure CO2 temperature and concentration in high temperature environment. The CO2 concentration and temperature of CO2/N-2 mixed gas in the gas absorption cell at different temperatures (873-1273 K) and different CO2 volume fraction (4%-10%) arc measured. The results show that, compared with the setting values, the average deviation and peak deviation of the measured temperature arc 2.07% and 3.49 %, respectively. The average deviation and peak deviation of the measured concentration arc 2.25 % and 4.75 %, respectively. The results indicate that the proposed method is accurate, and it provides references for CO2 detection in the high temperature environment.