Design of high dynamic range imaging optical system based on DMD
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摘要: 为了解决光电成像设备对空间实际场景观测时提出的高动态范围要求，设计了一种新型的像元级光强调制的高动态范围成像系统。系统由成像物镜、折叠反射镜、二次成像转置物镜组成，采用TI公司的数字微镜阵列（DMD）作为光强调制器件，通过光瞳匹配原则使两个系统完美衔接，并利用二次成像系统实现DMD单元与图像传感器的像素一一对应，设计结果显示：在像面的Nyquist频率处，全视场的MTF0.55，弥散圆的直径小于CMOS图像传感器的像素尺寸，并且畸变等像差也校正良好。该方法不仅可以提高图像传感器的可探测动态范围，还能够实时地探测到强弱目标，满足空间目标视景成像的要求。Abstract: In order to solve the high dynamic range requirement for photoelectric imaging device when it was used to observe the actual spatial scene, a newly high dynamic range imaging system whose light intensity was modulated in pixel level was designed. This system consisted of imaging lens, a fold mirror, secondary transpose imaging lens, using a DMD(Digital Micromirror Device) produced by TI Inc. as light intensity modulator, connecting the two systems perfectly through the principle of the pupil matching, and utilizing the secondary imaging system to realize one to one correspondence between DMD units and image sensor pixels. Full field of view of the MTF are higher than 0.55 at the Nyquist frequency of the image plane, and the RMS spot diameter is less than the pixel size of the CMOS image sensor in the focal plane, meanwhile such aberration of distortion is also corrected excellently. This method not only enhances detected dynamic range of the image senor, but also can detect bright and dark target simultaneously, meeting the requirements of spatial visual target imaging.
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