大动态范围微光相机的辐射定标

李永强; 赵占平; 徐彭梅; 王静怡; 郭永祥

doi:10.3788/IRLA201948.S117002

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大动态范围微光相机的辐射定标

李永强, 赵占平, 徐彭梅, 王静怡, 郭永祥

文章导航 > 红外与激光工程 > 2019 > 48(S1): 78-82

李永强, 赵占平, 徐彭梅, 王静怡, 郭永祥. 大动态范围微光相机的辐射定标[J]. 红外与激光工程, 2019, 48(S1): 78-82. doi: 10.3788/IRLA201948.S117002

引用本文:

李永强, 赵占平, 徐彭梅, 王静怡, 郭永祥. 大动态范围微光相机的辐射定标[J]. 红外与激光工程, 2019, 48(S1): 78-82. doi: 10.3788/IRLA201948.S117002

Li Yongqiang, Zhao Zhanping, Xu Pengmei, Wang Jingyi, Guo Yongxiang. Radiometric calibration of large dynamic range low light level camera[J]. Infrared and Laser Engineering, 2019, 48(S1): 78-82. doi: 10.3788/IRLA201948.S117002

Citation:

Li Yongqiang, Zhao Zhanping, Xu Pengmei, Wang Jingyi, Guo Yongxiang. Radiometric calibration of large dynamic range low light level camera[J]. Infrared and Laser Engineering, 2019, 48(S1): 78-82. doi: 10.3788/IRLA201948.S117002

大动态范围微光相机的辐射定标

doi: 10.3788/IRLA201948.S117002

1.
北京空间机电研究所,北京 100094

基金项目:

国家重大科技专项工程

详细信息

作者简介:
李永强(1979-),男,研究员,硕士,主要从事空间光学遥感系统测试、光谱辐射定标方面的研究。Email:99yongqiang@163.com

中图分类号: V447

Radiometric calibration of large dynamic range low light level camera

1.
Beijing Institute of Space Mechanics & Electricity,Beijing 100094,China

摘要: 微光相机可以获取从白天到夜晚星光照明条件下的大动态范围可见光目标的图像，辐射定标是确定微光相机辐射性能的关键环节，对于微光相机获取的遥感图像的定标化应用有十分重要的意义。对微光相机进行辐射定标的均匀辐射定标源的输出辐亮度范围需要覆盖110-9~310-2 W/（cm2sr）。为了实现在如此大动态范围内对微光相机的高精度辐射定标，设计了在每一个输出辐亮度级次均具有不变光谱分布的均匀辐射定标源。介绍了微光辐射定标光源的设计，采用三积分球级联式的设计方式，解决了在跨越多个数量级的大动态范围情况下，辐射定标源各辐亮度级次仍能保持一致光谱分布的难题。另外，如此大动态范围内保证各个辐亮度级次下光谱辐亮度的测量精度具有很大难度，通过传递测量的方法解决了微光各级次下光谱辐亮度测量的问题，给出了大动态范围微光相机的辐射定标结果，微光相机辐射定标的不确定度达到了18%（k=2）。
- 辐射定标 /
- 微光 /
- 动态范围 /
- 光谱定标
Abstract: The low light level camera (LLLC) can acquire images of Visible/Near Infrared (VIS/NIR) targets in large dynamic range which are from daylight to starlight conditions. Accurate radiometric calibration for the LLLC was a key part of determining the performance of the camera, and it's very important to the quantitive application of images. The output radiance of the uniform light source which is used to calibrate the LLLC should be in the range from 110-9 W/(cm2sr) to 310-2 W/(cm2sr). For realizing high-precision radiometric calibration, a uniform light source which had constant spectrum in each output level was designed. A three-integrating-sphere transfer design was adopted and the difficulty of constant spectrum for each output level of the light source over multiple orders of magnitude was overcame. The design of the uniform low light level source for radiometric calibration was introduced. Furthermore, the accuracy of spectral radiance measurement for such a large dynamic range light source was also a challenge. The spectral radiance of each output level of the light source was obtained by transfer measuring method. The result of radiometric calibration for large dynamic range LLLC was given. The uncertainty of radiometric calibration for the LLLC achieved 18% (k=2).
- radiometric calibration /
- low light level /
- dynamic range /
- spectral calibration

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大动态范围微光相机的辐射定标

doi: 10.3788/IRLA201948.S117002

1. 北京空间机电研究所,北京 100094

作者简介:
李永强(1979-),男,研究员,硕士,主要从事空间光学遥感系统测试、光谱辐射定标方面的研究。Email:99yongqiang@163.com

收稿日期: 2018-11-10
修回日期: 2018-12-20
刊出日期: 2019-04-25

基金项目:

国家重大科技专项工程

中图分类号: V447

关键词:

摘要: 微光相机可以获取从白天到夜晚星光照明条件下的大动态范围可见光目标的图像，辐射定标是确定微光相机辐射性能的关键环节，对于微光相机获取的遥感图像的定标化应用有十分重要的意义。对微光相机进行辐射定标的均匀辐射定标源的输出辐亮度范围需要覆盖110-9~310-2 W/（cm2sr）。为了实现在如此大动态范围内对微光相机的高精度辐射定标，设计了在每一个输出辐亮度级次均具有不变光谱分布的均匀辐射定标源。介绍了微光辐射定标光源的设计，采用三积分球级联式的设计方式，解决了在跨越多个数量级的大动态范围情况下，辐射定标源各辐亮度级次仍能保持一致光谱分布的难题。另外，如此大动态范围内保证各个辐亮度级次下光谱辐亮度的测量精度具有很大难度，通过传递测量的方法解决了微光各级次下光谱辐亮度测量的问题，给出了大动态范围微光相机的辐射定标结果，微光相机辐射定标的不确定度达到了18%（k=2）。

English Abstract

Radiometric calibration of large dynamic range low light level camera

1. Beijing Institute of Space Mechanics & Electricity,Beijing 100094,China

Received Date: 2018-11-10
Rev Recd Date: 2018-12-20
Publish Date: 2019-04-25

Keywords:

Abstract: The low light level camera (LLLC) can acquire images of Visible/Near Infrared (VIS/NIR) targets in large dynamic range which are from daylight to starlight conditions. Accurate radiometric calibration for the LLLC was a key part of determining the performance of the camera, and it's very important to the quantitive application of images. The output radiance of the uniform light source which is used to calibrate the LLLC should be in the range from 110-9 W/(cm2sr) to 310-2 W/(cm2sr). For realizing high-precision radiometric calibration, a uniform light source which had constant spectrum in each output level was designed. A three-integrating-sphere transfer design was adopted and the difficulty of constant spectrum for each output level of the light source over multiple orders of magnitude was overcame. The design of the uniform low light level source for radiometric calibration was introduced. Furthermore, the accuracy of spectral radiance measurement for such a large dynamic range light source was also a challenge. The spectral radiance of each output level of the light source was obtained by transfer measuring method. The result of radiometric calibration for large dynamic range LLLC was given. The uncertainty of radiometric calibration for the LLLC achieved 18% (k=2).