四通道微光偏振实时成像光学系统设计

为了提高微光成像质量, 实现针对动态目标或变化场景的实时性成像的需求, 基于偏振成像原理, 并结合孔径分割技术设计了微光偏振实时成像光学系统。光学系统采用共口径四通道阵列结构, 将4个待测偏振态分成4个独立的成像通道, 通过子孔径成像镜组对探测器靶面进行四象限分割成像, 每个偏振通道通过放置起偏状态不同的偏振片获取目标不同偏振态的强度图像, 从而实现实时偏振成像。光学系统的设计焦距为100 mm、系统整体F数为1.2、工作波长范围为0.4 μm～0.85 μm、最低工作照度为1×10-3 lx、可输出1 080 pixel全高清图像。系统光学总长为167.5 mm, 单通道镜头的MTF值在40 lp/mm处全视场均高于0.57。

Abstract

In order to improve the quality of low-light-level(LLL) imaging and achieve the requirement for real-time imaging for dynamic targets or changing scenes, a LLL polarization real-time imaging optical system was designed based on the polarization imaging principle and the division of aperture technique. To achieve simultaneously polarization imaging, the optical system uses an array of common-caliber four-channel configuration. This structure divides four polarization states to be measured into four independent imaging channels, and four-quadrant segmentation imaging is performed on the target surface of the detector through a sub-aperture imaging group set. Each polarized channel obtains an intensity image with different polarization states by placing polarizing plates with different polarization states. The focal length of the optical system is 100 mm, the system whole F number is 1.2, the operating wavelength is 0.4 μm～0.85 μm, the minimum working illumination is 1×10-3 lx, and the 1 080 pixel full high-definition (HD image) can be outputted. The total optical length of the system is 167.5 mm, and the modulation transfer function (MTF) value of the single-channel is higher than 0.57 at 40 lp/mm in full field of view.

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贾春辉, 高明, 杨书宁. 四通道微光偏振实时成像光学系统设计[J]. 应用光学, 2019, 40(2): 334. JIA Chunhui, GAO Ming, YANG Shuning. Optical system design of four-channel low light level polarization imaging[J]. Journal of Applied Optics, 2019, 40(2): 334.

四通道微光偏振实时成像光学系统设计

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