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鉴于数字微镜器件(DMD)良好的空间光调制性能,对其在光电设备中的应用及关键技术进行了深入研究。在分析DMD在数字投影系统中所能实现的最大帧频与系统结构形式、灰度级及DMD类型的关系基础上,给出了多DMD串联实现高灰度级的方案。探讨了利用DMD空间调制特性增强系统性能的具体实现方式,包括高动态范围成像、像素内目标特征检测、探测器像元几何超分辨、压缩感知及成像光谱仪等,并给出了应用过程中涉及的关键技术,如高动态范围成像中各像元曝光时间的确定、DMD微镜与探测器像元之间的几何配准、运动平台条件下探测器和目标之间相对运动以及DMD微镜填充率对系统性能的影响。各微镜角度可灵活控制、存储单元更新频率更高的DMD应用于可编程成像系统将是未来的发展方向。
In view of the good performance of DMD, the applications and key technologies of DMD are studied in detail. Based on the analysis of the relationship between the maximum frame rate (DMD) and the system structure, gray level and DMD type in digital projection system, a scheme of realizing multi-DMD in series with high gray level is given. The realization of system performance using DMD spatial modulation is discussed, including high dynamic range imaging, target feature detection in pixel, geometrical super resolution of detector pixel, compression sensing and imaging spectrometer, etc. Key technologies such as the determination of pixel exposure times in high dynamic range imaging, the geometric registration between DMD micromirrors and detector pixels, the relative motion between the detector and the target under the motion platform conditions, and the DMD micromirror fill The impact of system performance. Each micromirror angle can be flexibly controlled, and a DMD with a higher frequency of memory cell update for a programmable imaging system will be the future direction of development.