基于LCVR调谐的全偏振多谱段成像系统  

Design of Full-Polarized and Multi-Spectral Imaging System Based on LCVR

作　　者：张颖[1] 赵慧洁[1] 程宣[1] 熊胜军[1] 

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,精密光机电一体化技术教育部重点实验室,北京100191

出　　处：《光谱学与光谱分析》2011年第5期1375-1378,共4页Spectroscopy and Spectral Analysis

基　　金：国家(863计划)项目(2008AA121102);长江学者和创新团队发展计划(IRT0705)资助

摘　　要：提出一种新型全偏振多谱段成像系统,将液晶相位可变延迟器LCVR应用于全偏振成像技术,在可见-近红外波段上可快速实现光的全偏振态的精确调制。系统由光学镜头、LCVR、偏振片、滤波片和CCD探测器组成。文章首先介绍了系统结构、工作原理和光学设计,并提出了适合本系统的偏振定标方法,建立了偏振定标系统,实现了利用较小面积的偏振源对系统进行高精度偏振定标;再利用该成像系统进行了室外试验,获取了全偏振光谱图像,所获取的图像有较高的空间分辨率和光谱分辨率,最后对图像进行初步的数据处理,得到了被测物的偏振度图像。试验验证了该成像系统的全偏振多谱段数据成像获取能力,成像数据可应用于目标识别、目标分类等方面的分析。A new full-polarized multi-spectral imaging system is described,which uses electronically controlled LCVR（liquid crystal variable retarder） to modulate the full-polarized state of light in the visible to IR range.The system consisted of optical lenses,LCVRs,filters and CCD.Firstly,the system structure,working theory and optical design are introduced in the present paper.A polarization calibration method is provided and the calibration system was set up,which realized high-precision polarization calibration using a small polarized source.Then,a field experiment with the imaging system was carried out.Polarized spectral images with higher spectral and spatial resolution were collected.Finally,the data acquired were rough processed to get polarization degree image of the targets.It is concluded that the experiment has proved that the imaging system is effective in obtaining full-polarized and multi-spectral data.The image captured by the system can be applied to object identification and object classification.

关 键 词：光学系统设计 液晶相位可变延迟器 偏振定标 偏振光谱遥感 

分 类 号：TH74[机械工程—光学工程]