基于四象序列的最大熵原则的光轴对准方法  

Method for optical alignment based on principle of maximum entropy of four-quadrant detector sequence

作　　者：魏枫林[1] 母一宁[1] 尚瑞瑞[1] 刘泉[1] 

机构地区：[1]长春理工大学电子信息工程学院,吉林长春130022

出　　处：《红外与激光工程》2013年第7期1902-1906,共5页Infrared and Laser Engineering

基　　金：吉林省科技发展科技创新人才培育计划(20121302)

摘　　要：四象限探测器目前被广泛应用于空间激光通信中的对准过程,但由于大气湍流的不良影响,激光穿越大气在接收系统成像的时候,光斑产生形变以及破碎等不良影响,这严重地限制了四象限器件的对准精度。由于四象限探测自身所能提供的光斑信息较为单一,相较于CCD器件,其处理自由度较小。在分析研究基于CCD的序列光斑检测方法的理论基础之上,提出了一种基于四象限探测器的光轴对准方法。通过统计某一段时间内四象限器件所输出的脱靶量值的范围,并根据其在不同象限的分布概率计算出相应象限的熵作为加权系数,对原有计算公式进行加权计算,利用象限探测器高帧频的优势弥补原本单一的信息,从而完成对大气湍流影响的抑制作用,并搭建实验平台,最终验证该算法可以显著提高四象限器件的探测精度。Four-quadrant detectors is widely used in the align process in the space lase communications.ever, its adverse effects, such as deformation and spot broken, caused by the atmospheric turbulence,appear while the laser beam go through the atmosphere, which severely limits the alignment accuracy ofthe four-quadrant devices. Since four-quadrant detectors provide less message then the CCD, it＇s difficultto suppress the influence generated from the atmosphere. In this paper, a optical axis alignment methodwas proposed based on the four-quadrant detector. The value of the output miss distance of the four-quadrant detector for a certain time was calculated, the original formula was weighted by using theentropy that computing the entropy from the distribution probability of each quadrants. By takingadvantage of the high frame rate of the quadrant detector, insufficient information was made up for tosuppress the effect of the atmospheric turbulence, an experimental platform was set up, and a certaineffect was achieved.

关 键 词：四象限探测器 最大熵原则 大气湍流 

分 类 号：V11[航空宇航科学与技术—人机与环境工程]