The Study Of 3.5?m Mid-infrared Laser Heterodyne Spectroscopy Technology And System

Due to the rapid development of economy,solid pollutants and greenhouse gases emitted into the atmosphere have been profoundly affected the global climate and human health.The issue of global climate has become the political,economic and diplomatic concerns of governments all over the world.To be better understanding of the facts and laws of atmospheric pollution and climate change,as well as the assessment of the impact of environmental pollution and climate change,urgently need to improve the ability of high performance monitoring instruments to the long-term continuous observation of the multi trap and its interaction in the climate system.Because of the regional characteristics of greenhouse gases,if we only rely on one station observation,we cannot accurately grasp the characteristics of greenhouse gas's space-time evolution.At present,the measurement of the vertical profile of air polluted gas and greenhouse gas mainly depends on Fourier transform spectroscopy.However,due to its high price and complex system,it is difficult to be widely used.Compared with the traditional Fourier transform spectrometer,in recent years,the laser heterodyne absorption spectroscopy(laser heterodyne spectroscopy)developed has attracted wide attention because of its advantages of high spectral resolution,high detection sensitivity,small volume and convenient operation.This paper focuses on the research of infrared laser heterodyne spectroscopy in the atmospheric greenhouse gas,including the development of high precision solar tracker,the development of infrared laser heterodyne and the inversion algorithm of atmospheric greenhouse gas vertical profile.The paper focuses on the research of infrared heterodyne spectroscopy.(1)Based on 3.5?m ICL medium infrared laser,a high resolution infrared laser heterodyne system is established,and the parameter characteristics of each component are analyzed.(2)A software for retrieving vertical profiles of atmospheric greenhouse gases based on forward modeling and inversion models has been developed.(3)By Perot-Fabry etalon to accurately calibrate the wavelength of the laser heterodyne system,the vertical profile distribution of the solar absorption spectrum in the methane of the whole layer at the 3.5?m band is retrieved in combination with the instrument function of the infrared heterodyne system.