一种改进的相机灵敏度测试系统  

An improved testing system for camera sensitivity

作　　者：范新坤[1] 张磊[1] 佟首峰[1] 宋延嵩[1] 江伦[1] 张艺蓝[1] 

机构地区：[1]长春理工大学空地激光通信技术国防重点学科实验室,吉林长春130022

出　　处：《中国测试》2017年第6期65-69,共5页China Measurement & Test

基　　金：国家高新技术研究发展计划"863计划"资助项目(2014AA701178)

摘　　要：空间激光通信系统以激光为载体进行数据传输,由于大气信道干扰、剧烈平台扰动、强烈大气附面层等不利影响,使得捕获探测器接收到的光斑信号非常微弱,影响通信链路的建立,对捕获探测器的灵敏度测量有助于分析和评价捕获链路建立的最远距离。在充分分析捕获链路功率的基础上搭建实验系统,用扫描振镜及CCD相机完成对其灵敏度测试实验。实验表明:当曝光时间为2 ms和0.2 ms时,相机的探测能力分别为-80.83 d Bm和-72.43 d Bm。在极限探测灵敏度下,选用高斯拟合算法进行激光光斑中心的定位计算,结果表明该算法定位精度可达0.01pixel,并且具有良好的稳定性。Space laser communication system uses laser as the carrier for data transmission. Due to adverse effects such as atmospheric channel interference, violent platform disturbance and strong atmospheric boundary layer, the spot signal received by the capture detector is very weak, which affects the establishment of communication link. The sensitivity measurement of the capture detector helps to analyze and evaluate the furthest distance that the capture link is established. Based on the full analysis of the capture link power, the scanning galvanometer and CCD camera for testing system is set up, which can accomplish sensitivity test. The test results show that when the exposure time is 2ms and 0.2ms, detectivity of camera is -80.83 dBm and -72.43 dBm respectively. In the limit detection sensitivity, the Gaussian fitting algorithm is used to locate the center of the laser spot. The results show that the locating precision of the algorithm can reach 0.01 pixel with a good stability.

关 键 词：探测灵敏度 高斯拟合 亚像素定位 激光通信 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]