组合沃拉斯顿棱镜组的目标偏振检测方法

为了提高静态偏振光谱成像系统光谱分辨率并获得更好的目标识别能力，设计了正交组合沃拉斯顿棱镜组结构，配合静态相位调制技术完成了目标的偏振光谱成像。该技术采用了多级棱镜组合的方法在不扩大原有静态干涉棱镜尺寸的条件下扩大了空间光程差变化范围，从而提升了静态光谱分辨率。通过相位调制与图像周期性匹配的方法完成了二维图像与光谱分离。仿真分析了结构尺寸与调制度对光谱分辨能力的函数关系。实验采用计算模拟验证了二维图像与光谱分离的可行性。在晴天与阴天两种不同状态下，测试了30.0 cm铝板目标的信号对比度，采用偏振光谱成像并完成数据提取的测试结果均值为53.4%和49.3%，而基于强度图像的测试结果均值为24.4%和14.1%。文中设计可以改善目标识别效果，提高光谱分辨精度。

Target polarization detection method of combined Wollaston prism group

In order to improve the spectral resolution of the static polarization spectrum imaging system and obtain better target recognition ability, the orthogonal combined Wollaston prism group structure was designed, and the static phase modulation technology was used to complete the polarization spectrum imaging of the target. This technology used a multi-stage prism combination method to expand the range of spatial optical path difference without expanding the size of the original static interference prism, thereby improving the static spectral resolution. The two-dimensional image and the spectrum were separated by the method of phase modulation and image periodic matching. The function relationship between the structure size and the modulation degree on the spectral resolution was analyzed by simulation. The feasibility of the separation of the two-dimensional image and the spectrum were verified by computational simulation. The signal contrast of the 30.0 cm aluminum plate target was tested under two different conditions: sunny and cloudy. The polarization spectrum imaging was used and data extraction were 53.4% and 49.3%, while the mean of test result based on intensity image was 24.4 % and 14.1%. This design can improve the target recognition effect and increase the spectral resolution accuracy.