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Analysis and Reduction of Solar Stray Light in the Nighttime Imaging Camera of Luojia-1 Satellite

As one of the experimental payloads on Luojia-1 satellite, the nighttime imaging camera works with a high sensitivity to acquire nighttime light on earth. Solar stray light is a fatal problem for optical satellite works in the polar orbit, even for nighttime scene imaging, resulting in image saturat...

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Autores principales: Zhong, Xing, Su, Zhiqiang, Zhang, Guo, Chen, Zhigang, Meng, Yao, Li, Deren, Liu, Yong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6427462/
https://www.ncbi.nlm.nih.gov/pubmed/30845648
http://dx.doi.org/10.3390/s19051130
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author Zhong, Xing
Su, Zhiqiang
Zhang, Guo
Chen, Zhigang
Meng, Yao
Li, Deren
Liu, Yong
author_facet Zhong, Xing
Su, Zhiqiang
Zhang, Guo
Chen, Zhigang
Meng, Yao
Li, Deren
Liu, Yong
author_sort Zhong, Xing
collection PubMed
description As one of the experimental payloads on Luojia-1 satellite, the nighttime imaging camera works with a high sensitivity to acquire nighttime light on earth. Solar stray light is a fatal problem for optical satellite works in the polar orbit, even for nighttime scene imaging, resulting in image saturation and light signal detection failure. To solve this problem, an analysis of the range of solar incident angles was conducted firstly. Based on the result, a special-shaped baffle was designed to avoid direct sunlight incidence. Moreover, the capability of stray light elimination of the lens was enhanced by an order of magnitude via optimizing the internal structure. An evaluation of secondary scattering stray lights into the camera from surrounding parts was performed based on a real satellite model. The results showed that the stray light elimination reaches a 10(−10) order, meeting design requirements. Utilizing on-orbit images, the ability of satellites in illuminated areas to obtain artificial lights in dawn-dusk area was verified, proving the effectiveness of the stray light elimination design.
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spelling pubmed-64274622019-04-15 Analysis and Reduction of Solar Stray Light in the Nighttime Imaging Camera of Luojia-1 Satellite Zhong, Xing Su, Zhiqiang Zhang, Guo Chen, Zhigang Meng, Yao Li, Deren Liu, Yong Sensors (Basel) Article As one of the experimental payloads on Luojia-1 satellite, the nighttime imaging camera works with a high sensitivity to acquire nighttime light on earth. Solar stray light is a fatal problem for optical satellite works in the polar orbit, even for nighttime scene imaging, resulting in image saturation and light signal detection failure. To solve this problem, an analysis of the range of solar incident angles was conducted firstly. Based on the result, a special-shaped baffle was designed to avoid direct sunlight incidence. Moreover, the capability of stray light elimination of the lens was enhanced by an order of magnitude via optimizing the internal structure. An evaluation of secondary scattering stray lights into the camera from surrounding parts was performed based on a real satellite model. The results showed that the stray light elimination reaches a 10(−10) order, meeting design requirements. Utilizing on-orbit images, the ability of satellites in illuminated areas to obtain artificial lights in dawn-dusk area was verified, proving the effectiveness of the stray light elimination design. MDPI 2019-03-06 /pmc/articles/PMC6427462/ /pubmed/30845648 http://dx.doi.org/10.3390/s19051130 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhong, Xing
Su, Zhiqiang
Zhang, Guo
Chen, Zhigang
Meng, Yao
Li, Deren
Liu, Yong
Analysis and Reduction of Solar Stray Light in the Nighttime Imaging Camera of Luojia-1 Satellite
title Analysis and Reduction of Solar Stray Light in the Nighttime Imaging Camera of Luojia-1 Satellite
title_full Analysis and Reduction of Solar Stray Light in the Nighttime Imaging Camera of Luojia-1 Satellite
title_fullStr Analysis and Reduction of Solar Stray Light in the Nighttime Imaging Camera of Luojia-1 Satellite
title_full_unstemmed Analysis and Reduction of Solar Stray Light in the Nighttime Imaging Camera of Luojia-1 Satellite
title_short Analysis and Reduction of Solar Stray Light in the Nighttime Imaging Camera of Luojia-1 Satellite
title_sort analysis and reduction of solar stray light in the nighttime imaging camera of luojia-1 satellite
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6427462/
https://www.ncbi.nlm.nih.gov/pubmed/30845648
http://dx.doi.org/10.3390/s19051130
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