偏振相机的光学定标方案研究

Project of Calibration Method for Polarization Camera

偏振相机内部的多个光学表面会改变入射光束的偏振状态,并且改变的程度与入射光束的偏振态、视场角和方位角等因素有关.通过研究偏振光束与光学成像器件的相互作用,推导了考虑光学系统偏振效应的通用辐射模型,并基于辐射模型简要描述了目标偏振信息的反演方法及模型参数分离定标研究,给出了偏振相机的光学定标方案,确立了偏振相机输出与入射光束斯托克斯参量(I,Q,U)的定量关系,消除仪器自身的偏振效应,准确反演目标的偏振信息,为偏振遥感图像的定量化应用研究奠定基础。

The polarization state of the incident light can be changed differently according to the polarization state, viewing and azimuth angles of the incident light when it passes through the optical surfaces of the polarization camera. By analyzing the interaction between the incident light and the polarization camera, the radiometric model including the polarization capability is deduced. Calibration method of the radiometric model parameters and retrieval of the polarization information is introduced, and the general project of calibration for correcting the polarization phenomena of polarization camera is designed. The quantitative relation between output signal of polarization camera and Stokes parameters is given for high-accuracy polarization remote sensing, which can facilitate the quantitative application of polarization remote sensing information.