Several Key Technologies Of 532nm Rayleigh Doppler Lidar And Gravity Waves Study By Lidar Observation

532nm Rayleigh Doppler lidar plays an important role in detecting the atmospheric density, temperature and wind field in the height range of 30-70 km. The technology development of 532 nm Rayleigh Doppler lidar has great significance to the study of atmospheric dynamics and to ensure the safety of aircraft. In this article,based on the theory of measurement, several critical techniques in the 532 nm Doppler lidar system are analyzed. And the characteristics of atmospheric gravity wave in Beijing area are studied by Rayleigh lidar data.Iodine molecule absorption spectrometer is a key component of 532 nm Rayleigh Doppler lidar system. Iodine absorption spectra lines under different temperature have been measured. The errors of laser frequency stability and wind speed measurements caused by the iodine molecule absorption spectrometer temperature variation have been analyzed. By coordinating the PTZ voltage tuning and laser crystal temperature tuning, a new 532 nm laser frequency stabilization system has been founded. This system use a molecular iodine molecule absorption spectrometer and realizes a long-time stabilization of laser frequency. Based on a molecular iodine molecule absorption spectrometer, a pulse laser monitoring device was completed. This device can monitor the injection state and center frequency of a pulse laser. A laser beam self-aligning device has been developed, which may improve the signal-to-noise ratio of the received signal, and avoid measure errors caused by the difference between laser beams and Receiving telescope field.Temperature and wind measurements have been done by 532 nm Rayleigh Doppler lidar. Comparison of the lidar results with the TIMED/SABER temperature,radiosonde zonal wind, MERRA zonal wind showed good agreement, indicating that the lidar results are reasonable and reliable. A case of quasi monochromatic mountain waves observed by Rayleigh lidar in Beijing has been studied. Combining theRayleigh lidar data with the wind data of National Centers For Environmental Prediction(NCEP) Global Forecast System(GFS), the parameters of this mountain wave, such as propagation direction and propagation speed, have been calculated. The seasonal variations of atmospheric temperature and gravity wave activities from 35 km to 70 km in Beijing area are analyzed using the Rayleigh lidar data.