空间紫外遥感光谱仪器偏振特性研究

Polarization Performance in Space Ultraviolet Remote Sensing Spectral Instruments

为提高仪器整机性能及遥感数据反演质量,分析了仪器光学系统膜系对偏振的影响,利用氙灯、准直系统、布儒斯特起偏器和紫外光谱仪构建了一套偏振响应测试系统,测量了仪器在200~320nm紫外波段范围内的P光与S光的偏振响应。测试结果表明,仪器在P偏振光与S偏振光照射下呈现出不同的偏振响应,偏振态由S变化到P,紫外光谱仪响应峰值波长位置由290nm变化到275nm,双片漫透射板相比单片漫透射板,紫外光谱仪能量减少40%~75%;增加单片与双片漫透射板后,紫外光谱仪的偏振响应值均在265nm波长处达到最大,其中双片漫透射板使紫外光谱仪偏振响应更接近单位值1,缩小了不同偏振态光的偏振响应差异,更适用于同步辐射光源定标需求。

To improve the performance of instrument and the inversion of remote sensing data,we analyze the influence of instrument optical system films on polarization.The xenon lamp,collimation system,Brewster polarizer and ultraviolet spectrometer are used to build a set of polarization response testing system.P polarized light and S polarized light polarization response characteristics of the instrument are measured in the range from 200 nm to 320 nm ultraviolet wavelength band.The test result indicates that the instrument shows different polarization responses under P polarized and S polarized light irradiation.When the polarization is changing from S to P,the peak wavelength of ultraviolet spectrometer response changes from 290 nm to 275 nm.Meanwhile,the energy of ultraviolet spectrometer under double pieces diffuser reduces by 40% ~75% in comparison with single piece diffuser;under single piece diffuser and double pieces diffuser,spectrometer polarization response values both get maximum at 265 nm wavelength,while under double pieces diffuser,the polarization response of spectrometer is closer to unit value,and the variation of response to different polarization states is reduced,which is more suitable for the calibration requirement of the synchrotron radiation source.