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改进了利用双旋转波片方法进行偏振成像的实验装置,提出了通过一次测量获得目标偏振度和强度编码图像的方法。运用光强法对激光遥感偏振成像装置的光学元件进行调整,通过斯托克斯和穆勒矩阵在偏振光学元件中的应用,给出了相应光学元件的调整原理、方法及过程。分析了激光器中心波长变动、偏振片的角度误差和波片的相位延迟及角度误差对整个系统的影响。结果表明,由偏振片角度和波片角度误差造成的出射光斯托克斯误差较小,不超过0.001,可以忽略;由波片相位延迟不精确造成的误差在0.02左右,所以应采用延迟精度较高的波片;激光器中心波长变化的影响最大,不能忽略,必须加滤光片使接收光的中心波长控制在808nm;镀有铝膜望远镜对接收到的散射光偏振度影响较小,适于激光遥感偏振成像系统的应用。
The experimental setup for polarimetric imaging using the dual-rotating waveplate method is improved. A method of obtaining the target degree of polarization and the intensity-coded image by a single measurement is proposed. The optical element of the laser remote sensing polarization imaging device is adjusted by the light intensity method. The principle, method and process of adjusting the corresponding optical element are given through the application of Stokes and Mueller matrix in the polarization optical element. The influence of laser center wavelength variation, polarizer angle error, wave plate phase delay and angle error on the whole system was analyzed. The results show that Stoke’s error of exit light caused by polarizer angle and wave angle error is small and can not be ignored. The error caused by inaccuracy of wave plate phase delay is about 0.02, so the delay accuracy Higher wave plate; the influence of the wavelength change of the center of the laser is the greatest, which can not be neglected. The center wavelength of the received light must be controlled at 808 nm by adding a filter. The degree of polarization of the scattered light received by the aluminum coated telescope is less affected, Application to Laser Remote Sensing Polarization Imaging System.