基于瑞利散射的测风激光雷达研制

Development of wind lidar based on Rayleigh scattering

介绍了全球大气风场观测的重要性,研制了一台基于三通道标准具的车载瑞利多普勒测风激光雷达,用于平流层的风场探测。较为详细地介绍了测风的基本原理、系统的总体结构以及技术参数。利用紫外光在大气分子中的低吸收和高散射特点选取355 nm作为工作波长。描述了三通道标准具的结构以及利用脉冲光对标准具的透过率曲线进行了扫描,结果表明,标准具实测参数与设计参数基本一致,信号通道1和信号通道2峰值透过率分别为68.6%和67.5%。两个边缘通道的间隔为4.6 GHz。利用调试好的系统对合肥地区平流层进行了初步的风场探测,测试结果表明,该激光雷达系统稳定性达到设计指标。

The importance of global wind measurement was presented. A mobile direct detection Rayleigh Doppler lidar based on triple Fabry-Perot etalon was developed to detect wind field in the stratosphere. The principle of wind detection, overall structure of the lidar and the technique parameters were introduced. The wavelength of operation laser was selected 355 nm because of the ultraviolet light advantage that low absorbance and high backscatter when laser transmited in the atmosphere. The structure of triple etalon was presented and the curve of transmission was measured by the pulse laser. The result indicated the measured parameters accorded the design ＂value. The peak transmission of the signal channel 1 and signal channel 2 was 68.6% and 67.5% respectively. The separation of two edge channel was 4.6 GHz. The stratosphere wind field at Hefei was detected using the wind lidar system. Some preliminary wind profiles were shown and the results were discussed. The results show that this lidar system has high stability.