摘要
设计了一个532.25nm波长的转动拉曼激光雷达用新型全光纤分光系统,对强背景噪音下微弱的转动拉曼信号进行高精度提取,以用于探测大气温度。该新型全光纤分光系统由3个光纤布拉格光栅(FBG)及光纤环行器构成,利用FBG的波长选择特性,可高精度剔除大气回波信号中的米氏散射、瑞利散射信号成份,分离出中心波长分别为530.6nm和528.8nm的转动拉曼散射信号,用于反演大气温度。通过对分光系统进行参数优化设计和数值计算,表明基于FBG的分光系统可以对回波信号中的米氏散射、瑞利散射信号进行高达7个数量级以上的抑制,满足转动拉曼测温激光雷达对米氏散射、瑞利散射信号的高精度剔除。
An all-fiber spectroscopic filter of rotational Raman lidar system at a laser wavelength of 532.25 nm for temperature profiling is designed for the first time for filtering the weak rotational Raman signal under condition of intense background noise.The spectroscopic filter is optically constructed with three fiber Bragg gratings（FBG） and three optical circulators,and this configuration can separate two rotational Raman signals at the central wavelength of 530.6 nm and 528.8 nm,respectively,for atmospheric temperature retrieval,and block simultaneously Mie-scattering and Rayleigh-scattering signals with a high rejection rate.The spectroscopic filter parameters are designed and optimized by numerical calculation,and the results show that a rejection rate of larger than 7 orders of magnitude for Mie-and Rayleigh-scattering signals can be achieved,which is needed for rational Raman lidar for temperature profiling.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2010年第1期7-13,共7页
Acta Optica Sinica
基金
国家自然科学基金(60878050
40675015)资助课题
关键词
大气光学
转动拉曼激光雷达
光纤布拉格光栅
大气温度廓线
atmospheric optics rotational Raman lidar fiber Bragg grating atmospheric temperature profile
