The gas temperature compensation research based on TDLAS technology

Tunable diode laser absorption spectroscopy (TDLAS) technology has the characteristics of high sensitivity, selectivity and rapid response.The tunable and narrow linewidth of semiconductor lasers are used in this technique to realize the rapid and accurate online detection of target gas concentration, through the method of selecting the absorption line of the target gas to exclude the interference from other gas.This paper introduces the system and experiment of gas concentration detection based on TDLAS and studies the influence of temperature on gas measurement.Furthermore, a method of temperature measurement to reduce the error of the concentration measurement is presented in this paper, which uses the second harmonic peak ratio of the target line to measure temperature and compensate temperature in the case of unknown concentration.The final experimental results has validated the rationality of the temperature compensation method and further improved the accuracy of the gas concentration detection based on TDLAS technology.