光学学报, 2017, 37 (11): 1112003, 网络出版: 2018-09-07   

多角度偏振成像仪杂散光校正方法研究 下载: 1106次

Research on Correction Method of Stray Light in Directional Polarization Camera
张苗苗 1,2,3孟炳寰 1,3,*钱鸿鹄 1,2,3韩琳 3陈怀军 3王羿 1,3洪津 1,3
作者单位
1 中国科学院安徽光学精密机械研究所, 安徽 合肥 230031
2 中国科学技术大学, 安徽 合肥 230026
3 中国科学院通用光学定标与表征技术重点实验室, 安徽 合肥 230031
摘要
多角度偏振成像仪是一种超广角画幅式的偏振成像传感器,杂散光是影响其辐射偏振测量精度的重要因素之一。为了避免杂散光影响高精度定量参数的反演,需要在实验室对其进行专门的分析、测量和校正。根据多角度偏振成像仪的光学系统特点,将影响仪器的杂光分为局部杂光和全局杂光,重点分析了这两种杂光的成因和表现特性,并以此为基础构建了仪器的杂散光模型,提出了通过分区域照明获取杂光系数矩阵并对待校图像进行分块校正的方法。在未饱和及过饱和两种情况下,通过分矩形区域、分视场二维转动扫描成像的方式,建立了目标区辐射量和其他非目标区杂光量的关系,最终获得11×11区域的杂散光系数矩阵。最后根据实测得到的杂散光系数矩阵对图像进行了校正,结果表明,此校正方法可以消除至少90%的杂散光。
Abstract
The directional polarization camera is an ultra-wide-angle polarization imaging sensor, and stray light is one of the important factors that affect the radiation and polarization measurement precision. In order to avoid the influence of stray light on the inversion of high-precision quantitative parameters, special analysis, measurement and correction should be carried out in the laboratory. According to the characteristics of the optical system of the directional polarization camera, the stray light which affects the instrument is divided into local stray light and global stray light. The causes and performance characteristics of these two kinds of stray light are analyzed emphatically. On this basis, the stray light model of the instrument is constructed, and the method of obtaining the stray light coefficient matrix by partition of the illumination for correction the image is proposed. In the cases of unsaturation and supersaturation, by dividing the rectangular area and the two-dimensional rotation scanning imaging of the field of view, the relationship between the amount of radiation in the target area and the amount of scattered light in other non-target areas is established. Finally, the 11×11 regions of the stray light coefficient matrixes are obtained. The image is corrected according to the measured stray light coefficient matrixes. The results show that this correction method can eliminate at least 90% of stray light.

张苗苗, 孟炳寰, 钱鸿鹄, 韩琳, 陈怀军, 王羿, 洪津. 多角度偏振成像仪杂散光校正方法研究[J]. 光学学报, 2017, 37(11): 1112003. Miaomiao Zhang, Binghuan Meng, Honghu Qian, Lin Han, Huaijun Chen, Yi Wang, Jin Hong. Research on Correction Method of Stray Light in Directional Polarization Camera[J]. Acta Optica Sinica, 2017, 37(11): 1112003.

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