气压调谐的窄带滤波器研制及其在铁共振荧光激光雷达中的应用  

Development of pressure⁃tuned narrowband filter and its application in iron resonance fluorescence lidar

作　　者：李春伟 邓迁 李乘 吴德成 刘东 王珍珠 LI Chunwei;DENG Qian;LI Cheng;WU Decheng;LIU Dong;WANG Zhenzhu(Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;Advanced Laser Technology Laboratory of Anhui Province,Hefei 230037,China)

机构地区：[1]中国科学院合肥物质科学研究院安徽光学精密机械研究所,中国科学院大气光学重点实验室,安徽合肥230031 [2]中国科学技术大学,安徽合肥230026 [3]先进激光技术安徽省实验室,安徽合肥230037

出　　处：《量子电子学报》2025年第2期196-205,共10页Chinese Journal of Quantum Electronics

基　　金：安徽省重点研究与开发计划项目(2022h11020008);中国科学院青年创新促进会人才项目(Y2021113);中国科学院合肥物质科学研究院院长基金项目(2021YZGH01)。

摘　　要：铁共振荧光激光雷达是探测中间层顶至热层底部区域的温度和风场的重要设备,但在白天时段,由于强天空背景噪声的存在,铁原子共振荧光信号常被淹没,而无法实现中高层大气的温度和风场探测。为了解决该问题,本文研制了气压调谐的窄带滤波器,提出了将两个空气间隙的法布里-珀罗标准具串联并与窄带干涉滤光片组合的滤波新方法,并最终应用于铁共振荧光多普勒激光雷达中,实现了在白天时段对大气中间层顶至热层底部区域的温度和风场探测。首先,通过定义滤波器性能评价函数,对滤波器的滤波性能进行了定量分析,确定了两个标准具的带宽、自由光谱范围等参数;并进一步设计了基于PID算法的控制系统,实现了对标准具腔气压的精确控制;随后,通过模拟仿真测试了滤波器的设计指标;最后,通过外场试验证明了滤波器在铁共振荧光激光雷达中的滤波效果,其信噪比达到136以上,实现了铁层区域的风速和温度探测。Iron resonance fluorescence lidar is an important means of measuring temperature and wind field in the region from the top of the intermediate layer to the bottom of the thermosphere.However,due to the presence of strong sky background noise during the daytime,the resonance fluorescence signals of iron atoms are submerged,making it impossible to detect temperature and wind field in the middle and upper atmosphere.In order to solve this problem,this paper developed a tunable narrowband filter and proposed a new filtering method of connecting two Fabry-Perot etalons with air gap in series and combining them with a narrowband interference filter.Then the filter and the method were applied in iron resonance fluorescence Doppler lidar,achieving temperature and wind field detection in the region from the top of the intermediate layer to the bottom of the thermosphere during daytime.Firstly,by defining a filter performance evaluation function,the filtering performance of the filter was quantitatively analyzed,and parameters such as bandwidth and free spectral range of the two etalons were determined.Furthermore,a control system based on PID algorithm was designed to achieve precise control of the pressure in etalon chamber.Then,the design specifications of the filter were tested through simulation.And finally,field experiments demonstrated the filtering effectiveness of the filter in the iron resonance fluorescence lidar system,achieving a signal-to-noise ratio exceeding 136 and enabling wind speed and temperature detection in the iron layer region.

关 键 词：大气光学 窄带滤波器 法布里-珀罗标准具 铁共振荧光激光雷达 

分 类 号：TN958.98[电子电信—信号与信息处理]