光子学报, 2020, 49 (5): 0501001, 网络出版: 2020-06-04
静止轨道高光谱海洋水色仪光学系统设计
Optical System Design of Geostationary Hyperspectal Ocean Water Color Imager with Wide Coverage
摘要
设计了由超大口径前置望远系统和超大视场光谱仪组成的超大口径高光谱海洋水色仪.前置望远系统采用同轴三反光学系统结构, 口径为4 m, 视场为0.64°, 焦距为21.6 m, 波段范围为 400~1 000 nm.超大视场光谱仪采用改进的Offner结构, 视场为240 mm, 光谱分辨率为10 nm.探测器像元尺寸为15 μm×15 μm, 4片探测器交错拼接实现400 km幅宽.超大视场光谱仪在400~1 000 nm的宽波段内, 点列图半径的均方根值均小于3.9 μm, 静止轨道高光谱海洋水色仪全系统不同波长的MTF在33.3 lp/mm处大于0.52, 各项指标均满足应用要求.
Abstract
An ultra-large-caliber hyperspectral ocean water meter composed of an ultra-large-caliber front telescope system and an ultra-large-field-of-view spectrometer is designed. The front telephoto system uses a coaxial three-reflection optical system structure with a diameter of 4 m, a field of view of 0.64°, a focal length of 21.6 m, and a wavelength range of 400 to 1 000 nm. The large field of view spectrometer uses an improved Offner structure with a field of view of 240 mm and a spectral resolution of 10 nm. The detector pixel size is 15 μm × 15 μm, and four detectors are staggered to achieve a width of 400 km. The ultra-large field-of-view spectrometer is in a wide band of 400 to 1 000 nm, and the root mean square value of the dot chart radius is less than 3.9 μm. The MTF of the entire system of the static orbit hyperspectral ocean water meter is greater than 0.52 at 33.3 lp/mm, and each index meets the application requirements.
薛庆生, 田中天, 杨柏, 纪振华, 栾晓宁, 牟冰, 邱心涛. 静止轨道高光谱海洋水色仪光学系统设计[J]. 光子学报, 2020, 49(5): 0501001. XUE Qing-sheng, TIAN Zhong-tian, YANG Bai, JI Zhen-hua, LUAN Xiao-ning, MU Bing, QIU Xin-tao. Optical System Design of Geostationary Hyperspectal Ocean Water Color Imager with Wide Coverage[J]. ACTA PHOTONICA SINICA, 2020, 49(5): 0501001.