光学学报, 2010, 30 (1): 7, 网络出版: 2010-02-01   

全光纤拉曼测温激光雷达分光系统设计

Design of Spectroscopic Filter of All-Fiber Rotational Raman Lidar for Temperature Profiling
作者单位
1 西安理工大学 机械与精密仪器工程学院,陕西 西安 710048
2 北方民族大学 电气信息工程学院,宁夏 银川 750021
摘要
设计了一个532.25 nm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530.6 nm和528.8 nm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。
Abstract
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.
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毛建东, 华灯鑫, 胡辽林, 王玉峰, 汪丽. 全光纤拉曼测温激光雷达分光系统设计[J]. 光学学报, 2010, 30(1): 7. Mao Jiandong, Hua Dengxin, Hu Liaolin, Wang Yufeng, Wang Li. Design of Spectroscopic Filter of All-Fiber Rotational Raman Lidar for Temperature Profiling[J]. Acta Optica Sinica, 2010, 30(1): 7.

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