基于孔径分割与视场分割的通道型成像光谱偏振技术  

Channeled spectropolarimetry based on division of aperture and field of view

作　　者：权乃承[1] 张淳民[1] 穆廷魁[1] 

机构地区：[1]西安交通大学理学院,空间光学研究所,西安710049

出　　处：《物理学报》2016年第8期76-83,共8页Acta Physica Sinica

基　　金：国家高技术研究发展计划(批准号:2012AA121101);国家自然科学基金重点项目(批准号:41530422);国家自然科学基金(批准号:61540018,61275184,61405153);国家科技重大专项(批准号:32-Y30B08-9001-13/15);高等学校博士学科点专项科研基金(批准号:20130201120047)资助的课题~~

摘　　要：本文基于孔径分割、视场分割与通道光谱技术,提出一种成像光谱偏振技术的新方案.本方案在单一面阵探测器上同时获取经过不同强度调制的两对正反相干涉图,四幅干涉图相加获取强度加倍的目标图像,正反相干涉图相减获取纯干涉条纹,纯干涉条纹相加减获取强度加倍的单通道干涉条纹,对单通道干涉条纹进行傅里叶变换获取目标的光谱与偏振信息.文中描述了方案的原理结构,推导出了干涉强度的表达式,并利用计算机仿真验证了方案的可行性.为新型成像光谱偏振仪的设计和工程化应用提供了一种新思路.In order to obtain accurate image, spectrum and polarization state of target by the interferometric channeled spectropolarimeter, the interferogram and the image need to be separated. Although it can be achieved by digital image processing technology, heavy computations with approximation would be introduced. In the application of channeled spectropolarimetry, an inevitable crosstalk will be present between channels of the interferogram formed on the CCD.Spatial filtering in the optical path difference domain will generate a loss of spectral resolution and the distortion of the recovered spectrum. To overcome these drawbacks, a static imaging channeled spectropolarimeter based on division of aperture and field of view is presented. The aperture is divided by a polarization array, which consists of two polarizers with their transmission axes perpendicular to each other. The field of view is divided by a pair of lenses with the same focal lengths. The spectral modulation module is composed of an achromatic quarter wave plate, a retarder and a polarization array. The interference system consists of an achromatic half wave plate, a Wollaston prism, and a Savart polariscope. Two pairs of in-phase and anti-phase interferogram with different intensity modulations can be obtained simultaneously on a single detector array. The pure image of the target is acquired by the summation of the four interferograms. The background intensity is removed by the subtraction of the interferograms with in-phase and antiphase, and the pure interference fringes can be acquired. By the summation and subtraction of the two pure interference fringes, the single channeled interference fringes corresponding to spectrum of intensity and linear polarization state can be obtained. Spectral and polarization information of the target are acquired by Fourier transform of the single channeled interference fringes. Compared with previous instruments, the described model has the significant advantage that the background intensity can be removed from th

关 键 词：偏振成像光谱技术 孔径分割 视场分割 通道光谱技术 

分 类 号：O436.3[机械工程—光学工程]