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
微光 遥感器 参考光源 辐射定标 均匀性 low light level remote sensor reference light source radiometric calibration uniformity
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.