近红外偏振探测器是近年来一种新的探测器结构, 它将光栅附在了焦平面探测器的表面.为了解决光栅透射率和角度不均匀对线偏振度测量的影响, 采用了一种新的线偏振度求解方法.该方法对光栅透射率和光栅角度进行了校正, 消除了光栅透射率和光栅角度不均匀性对线偏振度测量的影响, 理论上表明了红外偏振成像质量与光栅透射率和光栅角度无关.实验结果显示, 在使用黑体作为标定光源和不考虑偏振像元之间串扰的情况下,采用原有的计算方法得到的结果是真实值的14%~24%, 透射率校正后的结果是真实值的80%~120%, 透射率和角度校正后的结果是真实值的96%~104%.

In this paper, a new NIR polarization detector is presented. It is fabricated out of a wire grid polarizer attaching to the surface of a FPA. A brand new method solving linear polarization is proposed at the same time. The transmittance and the angle of the wire grid are corrected. The effect on the degree of linear polarization (DoLP) measurement is also eliminated in this report. Theoretically, the infrared polarized image quality is independent of the transmittance and angle of wire grid. The experiment uses a blackbody source as the calibration light. The results show that, while ignoring the crosstalk between the polarized pixels, the measured value is about 14%~24% of the true value. After adding the transmittance correction, the data reaches the level of 80%~120% while it becomes 96% to 104% by applying the angle correction.