基于DMD的高动态范围望远系统设计

发布时间：2018-01-20 01:16

本文关键词： 光学设计动态范围数字微镜器件望远系统　出处：《光电工程》2014年12期 　论文类型：期刊论文

【摘要】：针对高动态范围目标,本文设计了一种基于数字微镜器件(DMD),能够对高动态目标进行自动区域调光的望远系统,其中DMD为中间像面。首先DMD上所有微反射镜处于开状态,获取一幅目标景象的图像,按照平均灰度和局部动态将该图像划分为若干小区域,并设定各区域的曝光时间等参数。按照确定的参数逐区控制DMD微反射镜的开关状态及时间,并完成探测器的曝光成像,获得具有高动态范围的图像。设计的望远系统焦距为223mm,F数为5,视场为3°,工作波段为480~760 nm,最终系统的动态范围可达140 d B。设计结果表明,在DMD像面上,各视场MTF在Nyquist频率处均大于0.70,畸变接近于0;在探测器像面上,各视场MTF在Nyquist频率处均大于0.55,畸变小于2%。
[Abstract]:For the target with high dynamic range, this paper designs a kind of telescopic system based on the digital micromirror device, which can automatically adjust the region light of the high dynamic target. The DMD is the middle image surface. First, all the micromirrors on DMD are open, and the image of a target scene is obtained. The image is divided into several small regions according to the average gray scale and local dynamics. The switching state and time of the DMD microreflector are controlled according to the determined parameters, and the exposure imaging of the detector is completed. Images with high dynamic range are obtained. The focal length of the system is 223mm F = 5, the field of view is 3 掳, and the working band is 480 nm. The dynamic range of the system is up to 140dB. The design results show that on the DMD image plane, the MTF of each field of view is greater than 0.70 at the Nyquist frequency, and the distortion is close to zero. On the image plane of the detector, the MTF of each field of view is greater than 0.55 at the Nyquist frequency, and the distortion is less than 2.
【作者单位】：中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【基金】：中国与白俄罗斯国际科技合作资助项目(2011DFR10010)
【分类号】：TH751
【正文快照】： 0引言在航天侦查以及观测深空星体、太阳活动、运载火箭的发射等领域,由于真实场景所展现的亮度范围超出了成像系统本身所能显示的动态范围,因此会造成图像传感器的大面积饱和,形成日晕、blooming等现象,使成像设备失灵,不能准确获取指定目标的图像数据。普通光电成像设备(CCD

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