静态调制的光谱偏振成像系统

Research on Spectral Polarization Imaging System Based on Static Modulation

针对传统光谱偏振成像系统普遍存在的系统结构复杂、需要动态调制、光通量低等问题,提出一种基于静态调制的光谱偏振成像系统,将静态调制偏振探测方法与Savart偏光镜干涉成像原理相结合,可在成像过程中实时获取目标的光谱信息和全部四个Stokes偏振信息。与传统系统相比较,该系统具有无运动部件、无需动态电控调制、没狭缝限制、光通量大等优点。介绍了系统组成和基本原理,搭建了实验装置,实验装置包括二次成像光学系统、偏振调制模块、干涉成像模块、CCD图像采集及数据处理模块等,成像谱段范围为可见光近红外（480~950nm）。利用实验装置对白板、飞机玩具模型进行了成像实验,验证了该系统的光谱偏振成像数据获取能力。对静态调制的偏振测量精度进行了验证,偏振测量统计误差小于5%。实验结果验证了系统原理的正确性和可行性,获取的光谱偏振成像数据在目标识别、目标分类、遥感探测等方面具有较高的应用价值。

The main disadvantages of traditional spectral polarization imaging system are ：complex structure ,with moving parts , low throughput .A novel method of spectral polarization imaging system is discussed ,which is based on static polarization inten‐sity modulation combined with Savart polariscope interference imaging .The imaging system can obtain real‐time information of spectral and four Stokes polarization messages .Compared with the conventional methods ,the advantages of the imaging system are compactness ,low mass and no moving parts ,no electrical control ,no slit and big throughput .The system structure and the basic theory are introduced .The experimental system is established in the laboratory .The experimental system consists of re‐imaging optics ,polarization intensity module ,interference imaging module ,and CCD data collecting and processing module .The spectral range is visible and near‐infrared （480~950 nm） .The white board and the plane toy are imaged by using the experimen‐tal system .The ability of obtaining spectral polarization imaging information is verified .The calibration system of static polariza‐tion modulation is set up .The statistical error of polarization degree detection is less than 5% .The validity and feasibility of the basic principle is proved by the experimental result .The spectral polarization data captured by the system can be applied to object identification ,object classification and remote sensing detection .