光学学报, 2019, 39 (9): 0912005, 网络出版: 2019-09-09
星载偏振扫描仪星上偏振定标器 下载: 1068次
Onboard Polarization Calibrators of Spaceborne Particulate Observing Scanning Polarimeter
测量 偏振定标 偏振定标器 偏振扫描仪 偏振测量 气溶胶 measurement polarization calibration polarization calibrator scanning polarimeter polarization measurement aerosols
摘要
为了满足偏振扫描仪的偏振测量精度要求,提出一种利用偏振扫描仪星上偏振定标器精确测量标准偏振态数值的方法。首先介绍了偏振扫描仪的技术特点、测量原理和偏振定标模型;其次结合仪器特性,将地球反照光+线偏振定标器/非偏振定标器作为在轨偏振定标的偏振态标准源;然后分别设计了专用的线偏振定标器和非偏振定标器;最后利用马吕斯定律确定线偏振定标器的偏振态数值,将星下点数据筛选出线偏振度小于0.4的下垫面反射光作为非偏振定标器的有效光源,以获得符合要求的非偏振光。所设计的定标器符合全光路、全孔径、端到端的要求,可保障长期在轨偏振测量精度为0.005。
Abstract
To achieve high polarization measurement accuracy of a particulate observing scanning polarimeter (POSP), onboard polarization calibrators are designed and a novel measurement method for their polarization state value is studied. First, the instrument overview, measurement principle, and polarization calibration model of the POSP are introduced. Second, based on the instrument characteristics, we proposed earthshine combined linear polarization calibrator (LPC) or non-polarization calibrator (NPC), two types of standard polarization state sources, and then design the LPC and NPC in detail. Finally, Marius's law is used to determine the polarization state value of the LPC. Data from observations of the satellite nadir are utilized to choose a underlying surface with a degree of linear polarization less than 0.4 as the effective light source for NPC. The two calibrators meet the requirements of full path, full aperture, and end-to-end calibration, ensuring the long-term polarization measurement accuracy of 0.005.
杨洪春, 洪津, 邹鹏, 宋茂新, 杨本永, 刘振海. 星载偏振扫描仪星上偏振定标器[J]. 光学学报, 2019, 39(9): 0912005. Hongchun Yang, Jin Hong, Peng Zou, Maoxin Song, Benyong Yang, Zhenhai Liu. Onboard Polarization Calibrators of Spaceborne Particulate Observing Scanning Polarimeter[J]. Acta Optica Sinica, 2019, 39(9): 0912005.