光学学报, 2011, 31 (s1): s100508, 网络出版: 2011-06-23
基于转动拉曼光谱的多普勒激光雷达灵敏度测量新方法
Novel Method to Measure Sensitivity of Doppler Lidar Using Rotational Raman Spectrum
大气光学 激光雷达 转动拉曼光谱 气溶胶后向散射比 测风灵敏度 atmospheric optics lidar rotational raman spectrum aerosol backscattering ratio wind measurement sensitivity
摘要
提出了一种多普勒激光雷达测风灵敏度实时测量的方法,解决测风时因气溶胶时空变化引入的灵敏度测不准问题。在多普勒测风激光雷达的接收系统中增加两个转动拉曼谱的接收通道,利用分光片和干涉滤光片分离提取大气的弹性散射谱和大气分子的转动拉曼谱,实时获取气溶胶后向散射比以测算灵敏度。系统采用532.25 nm波长的单纵模激光光源,探测出中心波长为531.3 nm和528.7 nm两个转动拉曼谱。对系统进行了数值计算和模拟分析,结果表明在脉冲能量300 mJ,望远镜口径270 mm的条件下,可实时获取低空对流层(5~8 km以下)的气溶胶后向散射比廓线,在线定标,提高了测风的准确度。
Abstract
A new method to measure real-time sensitivity of Doppler lidar is presented, to solve the sensitivity uncertainty problem caused by the spatial and temporal change of aerosol during wind detecting. Two receive channels of rotational Raman spectrum are added, system receives elastic scattering spectrum and rotational Raman spectrum respectively with beam splitters and interference filter so as to acquire the aerosol backscattering ratio for sensitivity calculation. The two rotational Raman spectrums, central wavelength of 531.3 nm and 528.7 nm, are detected with 532.25 nm wavelength single longitudinal mode laser. Data simulation and analysis show that the system is capable of measuring aerosol backscattering ratio profile of low-altitude troposphere (within 5~8 km) under conditions of laser energy of 300 mJ, 270 mm diameter telescope, and the on-line calibration can improve the accuracy of wind measurement.
陈阳, 吴松华, 刘智深. 基于转动拉曼光谱的多普勒激光雷达灵敏度测量新方法[J]. 光学学报, 2011, 31(s1): s100508. Chen Yang, Wu Songhua, Liu Zhishen. Novel Method to Measure Sensitivity of Doppler Lidar Using Rotational Raman Spectrum[J]. Acta Optica Sinica, 2011, 31(s1): s100508.