Study Of The Wind Lidar Based On Fizeau Interferometer

In order to research the change of climate, predict weather numerically and avoid shearing wind effectively to improve flight safety, reliable and accurate wind data are badly needed. So there is important meaning to measure wind real time.Trational methods of wind measure can not meet current needs and Doppler wind lidar is superior to trational methods in many aspects such as spatial resolution, azimuth,> integration time, flexibility and so on. When it comes to detect low atmosphere , fringe imaging technique which belongs to direct detection method is superior to edge techniques for its less sensitive to the Rayleigh background. Trational fringe imaging technique uses Fabry-Perot etalon and it produces ring fringe which inconveniences measurement. And Fizeau interferometer produces linear fringe which is convenient for using linear detector to detect the change of the center of gravity to determine wind velocity.Surrounding the subject, in this thesis the wind lidar based on Fizeau interferometer is researched. A generalized formulation of the signal on each channel for a wind lidar based on Fizeau interferometer and CCD is derived ;The parameters of Fizeau interferometer are optimized; Various data processing are discussed especially gravity method. The method error of gravity method has been corrected and the formula of measure error is derived correspondingly; The factors which may influence the measure precision of the system are analyzed; The wind detection performance of the system is simulated by Monte-Carlo technique and the result shows that at altitude of 0 to 3 kilometers, by using fringe technique, wind velocity error is below 0.31m/s. This indicates that the measure precision of the system can meet the requirement of wind measurement well.