水下天空偏振光视频采集实验装置设计与应用

Design and Application of Underwater Sky Polarization Light Video Collection Experimental Device

水下天空偏振信息的获取是水下潜航器实现偏振光导航的重要基础,为此搭建一种水下偏振相机采集天空偏振分布的实验装置,用于采集天空光经过水面折射后的水下偏振分布。实验装置分为防水外壳和偏振光传感器两部分。防水外壳的设计主要从材质、质量和密闭性考虑,偏振光传感器的核心是通过程序实现工控机控制偏振相机拍摄0°、45°、90°、135°的偏振图像和斯托克斯的4个矢量图像。结合计算机技术,利用相关算法计算偏振角、偏振度和偏振方位角。结果表明,偏振度和偏振角在太阳子午线上呈对称分布,太阳附近的偏振度最小,并以环状向外增大。该装置采集的数据能够有效提取太阳的方位信息。

The acquisition of underwater sky polarization information is an important foundation for underwater vehicles to achieve polarized light navigation.An experimental device for collecting sky polarization distribution with an underwater polarization camera is built to collect the underwater polarization distribution of sky light refracted by water surface.The experimental device is divided into two parts:a waterproof shell and a polarized light sensor.The design of the waterproof shell mainly considers material,quality,and airtightness.The core of the polarized light sensor is to control the polarization camera to capture polarization images of 0°,45°,90°,135°,and four vector images of Stokes through programming.Combined with computers,we use relevant algorithms to calculate polarization angle,degree of polarization,and polarization azimuth images.The results show that the polarization degree and polarization angle are symmetrically distributed on the solar meridian,with the polarization degree being the smallest near the sun and increasing outward in a circular region.The data collected by this device can effectively extract the orientation information of the sun.