Development Of The Stabilized Lidar Receiver For All-day Rayleigh Wind Lidar

Precise wind measurement with high temporal and spatial resolution can conduce to the study of the atmosphere,its dynamics and the improvement of the accurate numerical weather forecast.Rayleigh wind lidar is one of the most important technique for wind measurement.The lidar receiver is the most important part in the Rayleigh wind lidar,and has significant effect on the accuracy of the wind measurement.In this work,discussions start with the development of a Rayleigh wind lidar,and the major part is the development of the stabilized lidar receiver for all-day Rayleigh wind lidar aims to realize the stable system,accurate wind measurement and detection in day time.A method for zero Doppler shift correction is realized to correct the deviation.As the lidar receiver is the most important part in the Rayleigh wind lidar,and has significant effect on the accuracy of the wind measurement.A stabilized lidar receiver is developed for Doppler shift discrimination.This lidar receiver is based on the non-polarized beam splitter cube optically contacted FPI.The stability is tested by experiments and the influence to the wind detection is analyzed.According to the result of the transmissions measured in several days,the stability of the lidar receiver is validated.The error of the wind along with the line of sight is 1.6%.A combination of the interference filter with the F-P etalon filter with narrow band is set up as the ultra-narrow band filer combination for daytime wind measurement to depress the background when the measurement is taken in daytime.This conduces to the ability of the daytime detection of the lidar and the optical receiver.The effect of the ultra-narrow band filer combination on background depressing is shown by measured the atmospheric backscattering.The result shows that the combination can increase the ability of the daytime detection of the Rayleigh wind lidar.The background of the daytime detection is decrease to 4.89%and the altitude of the measurement is improved from~22 km to~33 km altitude.In order to eliminate the zero Doppler frequency deviation,the method for zero Doppler shift correction is proposed.This method is based on the non-polarized beam splitter cube optically contacted to the FPI.The reference laser without Doppler shift is leaded to the edge channels of the lidar receiver.This can eliminate the zero Doppler frequency deviation and increase the accuracy of wind measurement.The performance of the correction was validated in the experiment of the wind measurement.The stability and performance in long time are verified by four field experiments for wind measurements.