基于法布里-珀罗标准具四边缘技术的双频率多普勒激光雷达研究  

Research on Dual-Frequency Doppler Lidar Based on Fabry-Perot Etalon Quad-Edge Technique

作　　者：沈法华[1] 夏益祺 於爱爱 刘成林[1] 

机构地区：[1]盐城师范学院物理系,江苏盐城224002

出　　处：《光学学报》2014年第10期8-15,共8页Acta Optica Sinica

基　　金：江苏省自然科学基金青年基金(BK2012246);江苏省高校自然科学研究基金(12KJB170014);江苏省大学生创新创业训练计划项目(201310324049X)

摘　　要：对基于法布里-珀罗(F-P)标准具四边缘技术的双频率多普勒测风激光雷达进行研究。简要分析了F-P标准具四边缘双频率风速测量原理。详细介绍了基于F-P标准具四边缘双频率多普勒激光雷达系统结构。对发射激光双频率间隔、入射光束发散角、标准具有效口径和标准具干涉平板反射率等参数进行了详细的优化设计。根据选取的系统参数,对多普勒激光雷达系统的探测性能进行了仿真。仿真结果表明:晴天天气条件下,在±25m/s的径向风速测量动态范围内,在满足径向风速误差小于2m/s的情况下,当发射激光仰角为60°、距离和时间分辨率分别为60m和1min时,系统在晚间和白天的探测高度分别可达到8km和6.5km。系统在晚间的整体探测性能明显要优于基于F-P标准具双边缘技术的多普勒测风激光雷达系统。同时,系统的探测性能受天空背景噪声的影响较大,系统在白天工作时应采用窄带宽的滤光片以提高系统的探测性能。The dual frequency Doppler wind lidar based on Fabry-Perot （F-P） etalon quad-edge technique is studied. The principle of wind speed measurement by using F-P etalon four edges and two frequencies is analyzed briefly. The system structure of the dual frequency Doppler wind lidar based on F-P etalon quad-edge technique is decribed in detail. Several parameters, such as the two-frequency interval of outgoing laser, the incident beam divergence angle, the effective aperture of the etalon, and the reflectivity of etalon plates are optimized thoroughly. According to the selected system parameters, the detection performance of the Doppler lidar system is simulated. The simulation results show that on sunny weather conditions, within ± 25 m/s radial velocity measurement dynamic range, the system can achieve 8 km height at nighttime and 6.5 km height at daytime when the laser elevation is 60° , the spatial and temporal resolution are 60 m and 1 min, to meet the radial wind velocity measurement error less than 2 m/s. The overall system performance at nighttime is significantly better than that of Doppler wind lidar system based on F-P etalon double-edge technique. Meanwhile, the system＇s detection performance is greatly influenced by the sky background noise. Therefore, the system should be working during the day with a narrow bandwidth filter to improve the detection performance of the system.

关 键 词：大气光学 多普勒激光雷达 FABRY-PEROT标准具 四边缘技术 双频率 

分 类 号：TN958.98[电子电信—信号与信息处理]