近红外偏振探测器的定标及非均匀性校正
投稿时间:2019-05-21  修订日期:2019-11-06  点此下载全文
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尹佳琪 中国科学院上海技术物理研究所中国科学院大学中国科学院红外探测与成像技术重点实验室 yinjiaqi@mail.ustc.edu.cn 
王世勇 中国科学院上海技术物理研究所  
张 瑞 中国科学院上海技术物理研究所  
李范鸣 中国科学院红外探测与成像技术重点实验室
中国科学院上海技术物理研究所 
lfmjws@163.com 
基金项目:国家十三五国防预研项目(Jzz2016-0404/Y72-2);上海市现场物证重点实验室基金资助项目(2017xcwzk08)
中文摘要:近红外偏振探测器将微偏振片阵列集成在焦平面探测器的表面,不仅存在响应非均匀性,同时也存在微偏振片阵列透射率和消光比不均匀以及微偏振片角度误差,严重影响了偏振探测器的偏振探测准确度和偏振图像的均匀性。首先介绍了偏振探测器的结构,建立了探测器的信号响应模型,并基于该响应模型制定了相应的参数定标方案,实现了对入射辐射偏振态的高精度计算和对偏振图像的非均匀性校正。实验数据表明,校正后计算得到的线偏振度是真实值的97.8%~101.5%,满足了偏振探测的精度要求;强度图像和线偏振度图像相对于未校正图像的非均匀性分别降低了93.64%和93.67%,有效提高了图像质量。
中文关键词:近红外  偏振探测器  偏振定标  非均匀性校正
 
Calibration and non-uniformity correction of near-infrared polarization detector
Abstract:Near-infrared polarization detector integrates micro-polarizer array on the surface of focal plane detector, which not only has the non-uniformity of detector response, but also has the non-uniformity of transmittance and extinction ratio of micro-polarizer array and angle error of micro-polarizer, which seriously affects the accuracy of polarization detection and the uniformity of polarization image. The structure of the polarization detector is introduced firstly, the signal response model of the detector is established, and the corresponding parameter calibration scheme is made based on the response model to realize the high-precision calculation of the polarization state of the incident radiation and non-uniformity correction of polarization image. The experimental data show that the calculated linear polarization is 97.8% ~ 101.5% of the true value after calibration, which meets the accuracy requirements of polarization detection; the non-uniformity of intensity image and linear polarization image has been reduced by 93.64% and 93.67% respectively compared with the uncorrected image, which effectively improves the image quality.
keywords:Near infrared  Polarization detector  Polarization calibration  Non-uniformity Correction
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