Research On Atmospheric Rayleigh Spectrum Detection Lidar Based On Fizeau Interferomete

For atmospheric,the Rayleigh-Brillouin spectrum generated by the fluctuation of atmospheric molecules can accurately show the atmospheric temperature and pressure information at a specific altitude.However,the acquisition of atmospheric Rayleigh-Brillouin scattering spectra requires stable laser frequencies and precise sampling techniques to obtain a more complete atmospheric Rayleigh-Brillouin scattering spectrum at a certain altitude level.The main studies are as follows.(1)Firstly,the US76 atmospheric model combined with the Tenti S6 model was used for the architecture of the spectral ortho model,and the simulation results were analyzed.After that,the atmospheric field constructed using the WRF model combined with the Tenti S6 model is used for the architecture of the spectral orthorectification model,and the inversion results are analyzed for multiple comparisons,and finally,it is extended to the use in a multiseasonal environment.A lidar system based on a Fizeau interferometer with a wide free spectral range and a photomultiplier tube array with a multi-channel photocathode plane is designed.A ±1 M frequency drifted 355 nm single wavelength high re-frequency laser is used and the spectrum is captured using a large aperture astronomical telescope as well as a high sampling rate multi-channel acquisition card.The overall design ideas are highlighted in the study,as well as the design points and optimization design of the optoelectronic system regarding the system.(2)The designed atmospheric Rayleigh-Brilliance spectrum lidar system is used to conduct an outfield detection experiment to evaluate the maximum detection distance of the system,and to analyze and compare the analog detection and photon counting detection of the atmospheric RBS profile in the Longwang Mountain area of Pukou District,Nanjing,Jiangsu Province,China,and to describe the error sources and processing processes of the atmospheric RBS spectral signal.The results show that the system is capable of collecting atmospheric echo signals up to3 km,and the multi-channel photomultiplier tube is capable of capturing atmospheric Rayleigh-Brillouin scattering echo spectra up to 1.2 km after imaging by the Fizeau interferometer.Since there are many objective errors in the system,the errors are analyzed and corrected in this paper.