基于PSIM的偏振光谱仪集成实验样机

为了将偏振光谱强度调制(Polarization spectral intensity modulation, PSIM)技术应用于室外目标的偏振遥感测量,在PSIM偏振光谱仪实验室搭台实验基础上,开展了PSIM实验样机一体化集成设计。首先,将由格兰泰勒棱镜和两块高阶石英晶体延迟器构成的调制器按照原理要求集成安装成一个组件,再将该组件安装到光栅光谱仪的光学头部,完成PSIM偏振光谱仪系统的硬件一体化设计。利用交互式数据语言(Interactive data language, IDL)程序设计语言编写程序,将文件读写、数据处理及结果显示等功能集成在统一的用户界面中,实现了PSIM偏振光谱仪系统数据处理算法软件的一体化设计。最后,通过测量解析水平和垂直线偏振光的全Stokes矢量元素谱定性验证了实验样机的测量能力；利用偏振定标系统完成了集成实验样机的偏振定标。实验数据处理结果表明：实验样机能够实现待测光全Stokes矢量元素谱的同步获取;偏振定标盒输出光的全谱段偏振度值,实验样机的测量结果与理论输出结果间的最大误差约为0.003。实现了集成实验样机的设计目标。

Integrated Experimental Prototype of Spectropolarimeter Based on PSIM

In order to apply the polarization spectral intensity modulation (PSIM) technology to the fields of outdoor polarization remote sensing, an integrated PSIM spectropolarimeter experimental prototype is designed based on the laboratory principle model. First, a modulator consisting of a Glan-Taylor prism and two quartz crystal retarders is integrated into a module. Then the module is mounted on the head of the grating spectrometer to realize integrated hardware design of the PSIM spectropolarimeter. Based on interactive data language (IDL), the functions of file accessing , data processing and result displaying are integrated into one unified interface to realize an integrated software design of the PSIM spectropolarimeter. Finally, the measurement capability of the experimental prototype is verified by measuring the whole Stokes vector element spectrum of horizontal and vertical linear polarized light, and the polarization calibration of the experimental prototype is accomplished by using polarization calibration system. Experimental data processing results show that experimental prototype can synchronously achieve the whole Stokes vector element spectrum of the testing light, and the maximum error between the measured results of the experimental prototype and the theoretical output results is about 0.003 for the degree value of polarization in full spectrum of the light from the polarization calibration box. It is indicated that the design goal of integrated experimental prototype is realized.