空间光通信中高帧频相机动态调光技术研究

Dynamic Light-Adjusting Technology of High Frame Frequency CCD Camera in Space Optical Communication System

为了满足空间光通信精密跟踪的需求,在信标光路中保证光电探测器接收到的激光能量稳定不变,研制了满足大气环境下动态光强稳定装置。对该装置所采用的基于液晶的高帧频相机动态调光技术进行研究。通过与传统机械调光、电子快门调光相比较,验证基于液晶的高帧频相机动态调光技术的可行性。结合空间光通信系统的特点,阐述基于液晶的动态调光原理。介绍了基于液晶的动态光强稳定装置系统组成,给出实验数据和结果。结果表明:采用液晶光束衰减器对高帧频CCD相机进行动态调光,可以实现在无机械运动部件条件下对信标激光能量进行自动控制,从而保证探测器接收到的激光能量稳定。因此在空间光通信中,基于液晶的高帧频相机动态调光技术是可行的,而且有着广阔的应用前景。

In order to satisfy the requirement of space optical communication system,and ensure relative stabilization of beaconing laser spot energy detected by photoelectric detector,an device for dynamic stabilizing laser energy is developed and dynamic light-adjusting technology of high frame frequency CCD camera based on liquid crystal is investigated.Compared with mechanical and electronic shutter,it proves the feasibility of dynamic light-adjusting technology based on liquid crystal.Then combined with the characteristic of space optical communication system,it is discussed the dynamic light-adjusting principle of high frame frequency CCD camera based on liquid crystal in detail.Finally,it presents the principle block diagram of the device,data and result of experiment.Experimental results indicate that the dynamic light-adjusting technology based on liquid crystal spatial light attenuator can achieve energy autocontrol of beaconing laser without moving optics,thereby ensuring relative stabilization of laser spot energy detected by photoelectric detector.It proves the feasibility of dynamic light-adjusting technology based on liquid crystal,at the same time it is pointed that liquid crystal as a new type dynamic optics module with flexible adjusting have wider application foreground in space optical communication system.