Temperature measurement based on adaptive dual-comb absorption spectral detection

We demonstrate absorption spectroscopy of water vapor for the determination of gas temperature. An adaptive dual-comb detection system is utilized to obtain precise spectroscopic data in a broadband range from 7143 to7240 cm;with a spectral resolution of 0.049 cm;. The measured spectra are in accordance with the simulated results from the HITRAN（high-resolution transmission molecular absorption） database. Several measurements are investigated in the temperature range of 500–1000 K, revealing relative deviations of less than 5% compared to the thermocouple. This broadband and accurate adaptive dual-comb spectral detection method could be a powerful tool for non-invasive combustion diagnosis.