一种周视激光回波接收光纤光学系统设计

Design of a Panoramic Fiber Optical System for Laser Echo Receiving

提出了一种基于光纤束的激光回波接收光学系统，该系统仅需一个直径为3mm的光电探测器即可实现360。周视探测。系统由前置耦合光学系统、光纤传输束、后置聚焦光学系统三部分组成：8套耦合子系统将各子扇区光线耦合进光纤束中；光纤传输束作为集光装置，将8个矩形视场的入射光线转化为1个圆形视场的出射光线，从而解决非对称视场和圆形探测器的匹配问题；后置聚焦光学系统将光纤束的出射光线会聚在圆形探测器上。模拟计算得到各视场能量接收效率均达80％以上，中心和边缘视场差异不超过8％。结果表明：该系统探测距离长，各方向探测距离一致性好，而且仅需一个红外探测器实现无盲点周视探测，便于后续处理。

A solution of optical system to receive laser echo light based on the configuration and transmission properties of fiber bundle is proposed. This system just needs a detector with diameter of 3 mm for realizing the panoramic detection. The system consists of three parts： front coupling system, fiber bundle and rear focusing optical system. 8 sets of coupling subsystem couple the eight sectors＇ laser echo lights into the fiber bundle. Then, fiber bundle as a device to collect light, converts the 8 rectangular fields of incident light into a circular field of emergent light matching the circular detector. The emergent light from the fiber bundle is converged on the detector by the rear focusing optical system. The energy receiving efficiency is more than 80 % and the difference between each view is less than 8% through simulation. The result indicates that the system＇s detection range is far and consistent in each direction. Due to requiring only one infrared detector to realize no blind spot panoramic detection. It facilitates subsequent processing.