中国激光, 2016, 43 (4): 0414004, 网络出版: 2016-03-29   

近红外高光谱分辨率激光雷达光谱滤光器性能分析

Spectrum Filter Performance Analysis on Near-Infrared High-Spectral-Resolution Lidar
作者单位
1 浙江大学光电科学与工程学院现代光学仪器国家重点实验室, 浙江 杭州 310027
2 中国工程物理研究院精密光学工程研究中心, 四川 成都 610041
摘要
近红外高光谱分辨率激光雷达(HSRL)分子散射回波信号具有频谱展宽窄、能量弱等特点,相对于紫外和可见光HSRL 研发难度大大增加。光谱滤光器作为HSRL 的关键器件之一,与HSRL 系统的反演精度密切相关。根据光谱滤光器的信号透射率和光谱分离比与HSRL 系统反演精度的关系,通过分析1064 nm HSRL 散射回波的特点,对两种具有代表性的干涉光谱滤光器进行了建模和仿真分析。结果表明,在光束发散角较小时,Fabry-Perot干涉滤光器具有较好的滤光性能,但对面形精度要求较高,不易于加工和装调;视场展宽Michelson 干涉滤光器(FWMI)对光束的发散角不敏感,集光能力强,且对面形精度的要求相对较低,在实际应用中更适合用于近红外HSRL 系统光谱滤光器。
Abstract
Near- infrared high- spectral- resolution lidar (HSRL) is more difficult to develop as its molecule scattering echo signal has a narrower spectrum width and a weaker energy strength than that of the ultraviolet and visible HSRLs. As one of the key components of HSRL, the spectrum filter has significant influences on the retrieval accuracy of HSRLs. Based on the relationship between the spectral filter′ s signal transmittance and spectral discrimination ratio and the retrieval accuracy of the HSRL, the performances of two typical interference spectrum filters are modeled and simulated by analyzing the characteristics of lidar echo at 1064 nm. Results show that Fabry- Perot interference filter has moderately good performances when the divergence of incident beam is small. While the requirement for surface precision is fairly high and it is not easy to be processed and installed. Field-widened Michelson interferometer (FWMI) is insensitive to the divergence of incident beam and has a stronger ability to gathering the lidar echo. And the requirement for surface precision is relatively low. In practical application, it is more suitable for the application requirement of near-infrared HSRL.

张与鹏, 刘东, 杨甬英, 罗敬, 成中涛, 周雨迪, 白剑, 汪凯巍, 沈亦兵, 杨李茗. 近红外高光谱分辨率激光雷达光谱滤光器性能分析[J]. 中国激光, 2016, 43(4): 0414004. Zhang Yupeng, Liu Dong, Yang Yongying, Luo Jing, Cheng Zhongtao, Zhou Yudi, Bai Jian, Wang Kaiwei, Shen Yibing, Yang Liming. Spectrum Filter Performance Analysis on Near-Infrared High-Spectral-Resolution Lidar[J]. Chinese Journal of Lasers, 2016, 43(4): 0414004.

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