应用光学, 2020, 41 (1): 140, 网络出版: 2021-06-18   

星载微光遥感器外场辐射定标光源的研制和检测

Design and test of in-site radiometric calibration reference light source for spaceborne low light level remote sensors
作者单位
1 中国科学院 通用光学定标与表征技术重点实验室,中国科学院 安徽光学精密机械研究所,安徽 合肥 230031
2 中国科学技术大学,安徽 合肥 230026
摘要
LED外场辐射定标积分球光源基于辐射通量等效理论,用于星载微光遥感器的在轨辐射定标。该定标光源采用12组峰值波长670 nm的LED密集阵列发光单元,每组最大电功率300 W,辐亮度输出达到5.2×10?2 W·cm?2·sr?1,通过等效辐射通量面积校正后,能够适用于10?9 W·cm?2·sr?1量级的微光通道在轨定标。光源的参数检测结果表明:定标光源角度均匀性在±30°以内优于99.6%,平面均匀性优于99.7%,1 h内稳定性优于99.9%,具有优良的辐射特性。在敦煌中国遥感卫星辐射校正场对VIIRS微光通道进行了在轨实测试验,在轨响应结果为8.27×10?9 W·cm?2·sr?1(含月光贡献和大气影响),证明了该外场微光定标光源辐射量值设计的合理性。
Abstract
Aiming at on-orbit radiation calibration of spaceborne low-light-level remote sensor, an out-site radiation (LED) light source based on the theory of radiation flux equivalence is designed. The designed calibration light source uses twelve 670 nm pick-wavelength LED modules, with each LED module max power dissipation of 300 W, and the max output radiance over 5.2×10-2 W·cm-2·sr-1. Based on the calibrating area of equivalent radiation flux, it can be applied to the on-orbit calibration of low-light-level channels in the order of 10-9 W·cm-2·sr-1. The test results show that the planar uniformity of the source is better than 99.7% at the exit port, the angular uniformity is better than 99.6% within ±30° to the exit normal, and the stability of source is better than 99.9% within 1 h. In-orbit test of the low-light-level channel of VIIRS was carried out at the radiation correction field of Dunhuang Chinese remote sensing satellite, on-orbit response results was 8.27×10-9 W·cm-2·sr-1. (including moonlight contribution and atmospheric impact). The rationality of the design of the radiation value of the out-site low-light-level calibration light source proposed in this paper is proved.

甘涛, 袁银麟, 翟文超, 郑小兵, 孟凡刚, 吴浩宇. 星载微光遥感器外场辐射定标光源的研制和检测[J]. 应用光学, 2020, 41(1): 140. Tao GAN, Yinlin YUAN, Wenchao ZHAI, Xiaobing ZHENG, Fangang MENG, Haoyu WU. Design and test of in-site radiometric calibration reference light source for spaceborne low light level remote sensors[J]. Journal of Applied Optics, 2020, 41(1): 140.

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