Gas temperature and concentration parameter measuring method based on laser absorption impedance spectroscopy

The invention provides a gas temperature and concentration measurement method based on laser absorption impedance spectroscopy, belongs to the technical field of laser absorption spectroscopy, and is used for path mean value measurement of gas temperature and molecular concentration. The laser absorption impedance spectrum is a complex impedance spectrum with the laser absorption intensity spectrum as the intensity and the laser absorption phase spectrum as the phase, and compared with a traditional laser absorption intensity spectrum technology, the laser absorption impedance spectrum can obtain the complete complex line type characteristics of transmission light, enrich measurement data and improve the temperature and concentration measurement precision and the anti-noise capability. In the specific measurement process, firstly, an intensity modulation method is adopted to measure the intensity and a phase spectrum at the same time, a frequency mixing mode is adopted to reduce the detection signal frequency