基于偏振激光辅助照明的ICCD探测技术研究

为了验证偏振激光辅助照明ICCD探测目标的可行性,I以偏振成像探测原理为基础,提出一套基于偏振激光辅助照明的ICCD探测系统.该系统采用808 nm人眼不可见偏振激光辅助照明,ICCD对后向散射激光进行检偏和光电信息转换,实现背景中目标的偏振成像探测.通过在野外环境中对该系统的探测能力进行实验测试,结果表明,在0°、45°和90°检偏角下,人造金属涂漆目标对照射偏振激光退偏小于10%;绿色背景对照射偏振激光退偏度约50%;沙土地面退偏度约30%,人造金属涂漆目标相对于自然背景随检偏角增大图像对比度也越大.

Abstract

In order to validate the feasibility that the intensified charge-coupled device(ICCD)detect target by polarization laser assistant illumination,a polarization laser assistant illumination ICCD detection system was manufactured by polarization imaging detection technology.The system adopted an 808 nm semiconductor laser as illumination source to illuminate target,which wasnt detected by human-eye,and the ICCD polarization detection system was used as electric-optic conversion module to detect target,and finally achieved the target detection on background.An experiment was designed to validate the result of the polarization imaging detection in the field environment.The result shows that the man-made-metal-target depolarization is almost 10%,and the green-background-target depolarization is 50%,and the sand-target depolarization is almost 30% 0° at 45°,and 90° polarization angle.The imaging contrast for the man-made target and the natural background is improved as the polarization angle enlarging.

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