激光测距仪的点源透过率  

Point source transmittance of laser range finder

作　　者：张宝东[1] 秦石乔[1] 胡春生[1] 黄宗升[1] 孙可[1] 

机构地区：[1]国防科学技术大学光电科学与工程学院,长沙410073

出　　处：《强激光与粒子束》2008年第7期1063-1066,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(60677041)

摘　　要：通过分析柱形腔结构的激光接收机的点源透过率,论证了视场外利用杂散光干扰激光测距仪的可行性和对干扰光功率的相对需求。按照干扰光入射角度由小到大的顺序,提出了漫反射-镜面反射干扰、二次漫反射干扰和一次漫反射干扰的杂散光干扰机制,推导出了相应的点源透过率公式,并利用Tracepro软件进行了仿真验证。理论分析和仿真结果表明:在典型条件下为了确保在30°内可靠干扰激光测距仪,对干扰光功率的需求相对于视场内干扰时要高出5×106倍,确保80°内可靠干扰则需提高108倍。从提高光电接收系统抗干扰能力的角度指出:降低滤光片镜面反射率并使其远离探测器,可以减小漫反射-镜面反射干扰;降低接收光学系统腔内壁漫反射率,可以减小二次漫反射和一次漫反射干扰。By means of analyzing the point source transmittance of the laser receiver with optical structure of cylindric cavity, the feasibility and relative light power demand to jam laser rangefinder with the stray light is investigated. According to the increasing incident angle of jamming light, three major mechanisms of stray light jamming, i. e. , diffuse reflection-specular reflection jamming, double diffuse reflection jamming and single diffuse reflection jamming are presented. The corresponding PST function is also derived. Furthermore, the digital simulation using Tracepro software is adopted to verify the functions. The results show that under typical condition to jam the laser range finder reliably within 30°, the jamming light power should be 5 ）〈 10^6 times than that of jamming at 0°, and within 80°, it should be 10^8 times. From the aspect of improving the anti-jamming capability of a photoelectric receiving system, it is pointed out that lowering the filter＇s reflection ratio and placing it far away from detector can decrease the diffuse reflection-specular reflection jamming, and lowering the diffuse reflection ratio of the inner surface can decrease both double diffuse reflection jamming and single diffuse reflection jamming.

关 键 词：激光测距 激光有源干扰 杂散光干扰 点源透过率 漫反射 镜面反射 

分 类 号：TN977[电子电信—信号与信息处理]