基于LCTF与LCVR的偏振高光谱成像系统设计

摘要

A hyperspectral polarimetic imaging system was proposed based on LCTF and LCVR.The system could break the limit of incomplete polarization acquiring by the conventional single LCTF system and acquire the full Stokes parameters of targets.It used the 4 different groups of phase retardance of LCVRs to build a 4×4 inversion algorithm matrix to calculate the original full polarization information.After calibration of the Retardance-Voltage characters of two LCVRs,the inversion algorithm was verified by laser at 633nm.The measured errors of full Stokes parameters,corresponding calculated degree and angel of linear polarization were analyzed,and the inversion algorithm was proved work well.The results indicated that the hyperspectral polarimetric imaging system could provide reliable hyperspectral and polarization information for remote sensing.%提出一种基于液晶可调滤光片(LCTF)与两片液晶可调相位延迟器(LCVR)构成的偏振高光谱成像系统,相对于传统LCTF具有转动部件以及无法获取全部偏振态的特点,本系统能够静态凝视成像并且测量目标完整的Stokes参量.通过对两片LCVR取四组不同延迟组合,构造了一个4×4复原矩阵来获取目标的原始全偏振信息.使用干涉光强法,对两片LCVR分别进行了延迟-电压特性的精确测量;在633 nm下验证了全偏振复原算法,通过对误差分析,得到了较好的反演Stokes参数和相应的DoLP与Orient计算值,验证了复原算法的可靠性,可以为全偏振态高光谱遥感成像提供有效的数据.