基于数字微镜阵列光调制的激光防护系统

摘要

提出一种基于数字微镜阵列( DMD)的激光防护系统设计方案,利用DMD的光调制作用减少强激光对光电成像设备的损坏. 详细介绍了系统的工作原理﹑DMD及CCD的选型﹑投影光路和光学转换系统的设计,运用相移莫尔法进行了图像像素的调校. 模拟实验结果显示,该系统可在不同光斑半径和光强的条件下成功识别激光光斑中心点的像素坐标和半径,实现对光斑对应区域的微反射镜控制,激光光强可衰减70%以上.%A design scheme of laser protection system based on digital micro-mirror device ( DMD) was proposed to reduce the damage of intense laser to optoelectronic imaging equipment. The work-ing principle of the system, the model selection of DMD and CCD, the projection optical path and the design of optical conversion system were introduced in detail. The image pixels were tuned by using the phase-shifting Mohr method. The simulation results show that the system can successfully identify pixel coordinates and radiuses of the laser spot center points in different spot radiuses and light intensities, and achieve micro-mirror control of the corresponding regions of spots. The laser light intensity can be attenuated by over 70%.