Abstract: With the advancement of laser absorption spectroscopy technology in applications under complex conditions and the demand for high-precision measurements,supercontinuum laser absorption spectroscopy measurement technology has begun to receive widespread attention.This study conducts research on temperature measurement technology based on supercontinuum laser absorption spectroscopy,developing a supercontinuum spectral feature matching method for simultaneously resolving parameters such as temperature and concentration.Simulation calculations and experimental validations were carried out.Through simulation calculations,absorbance data were obtained for temperature resolution in the range of 300 K to 2 600 K,verifying the feasibility of this method for accurate temperature measurement.A measurement system was also built,and experimental validation was conducted at eight temperature points from 473 K to 1 173 K using the spectral absorption of water molecules in the range of 7 433 cm^-1 to 7 446 cm^-1.By synchronously fitting the baseline correction parameters,time-frequency conversion parameters,and the parameters to be measured,experimental temperature measurements based on the supercontinuum spectral feature matching method were achieved,with a maximum relative error of -1.98% in temperature measurement.The experimental results demonstrate the accuracy of the supercontinuum spectral feature matching method in temperature measurement.

Key words: Spectroscopic temperature measurement, Absorption spectrum, Spectral feature