Multi-beam array stitching method based on scanning Hartmann for imaging quality evaluation of large space telescopes

Abstract To test large-aperture space optical systems in a simple and highly efficient manner, the scanning Hartmann test (SHT) has been used to measure the sub-aperture wavefront slopes of optical systems by scanning with a collimated beam followed by retrieval of the overall wavefront form. Howeve...

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Autores principales:	Haisong Wei, Haixiang Hu, Feng Yan, Xindong Chen, Qiang Cheng, Donglin Xue, Xuejun Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/cf114533246f458d9be19494689c6440
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spelling	oai:doaj.org-article:cf114533246f458d9be19494689c64402021-12-02T16:07:50ZMulti-beam array stitching method based on scanning Hartmann for imaging quality evaluation of large space telescopes10.1038/s41598-018-25632-02045-2322https://doaj.org/article/cf114533246f458d9be19494689c64402018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25632-0https://doaj.org/toc/2045-2322Abstract To test large-aperture space optical systems in a simple and highly efficient manner, the scanning Hartmann test (SHT) has been used to measure the sub-aperture wavefront slopes of optical systems by scanning with a collimated beam followed by retrieval of the overall wavefront form. However, the use of such a method contains a crucial flaw in that pointing errors of the translation stage can severely affect the test accuracy. Therefore, a multi-beam stitching method is proposed to correct pointing errors by stitching together data obtained by successive sub-aperture acquisition. In this paper, a test principle and a data processing method are detailed. Simulation results theoretically verify a high precision for the stitching algorithm. Furthermore, a multi-beam array stitching test system (MASTS) is developed and used to successfully test an actual space optical system of ∅800 mm. The MASTS shows a deviation of 1/50 λ (λ = 632.8 nm) root mean square (RMS) from the interferometric results and a repeatability of 1/80 λ RMS, which demonstrates high precision, high repeatability and low sensitivity to air turbulence compared to interferometric measurement. In future engineering applications, the MASTS has great potential to solve the test problems of space optical systems using ultra-large apertures.Haisong WeiHaixiang HuFeng YanXindong ChenQiang ChengDonglin XueXuejun ZhangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-11 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Haisong Wei Haixiang Hu Feng Yan Xindong Chen Qiang Cheng Donglin Xue Xuejun Zhang Multi-beam array stitching method based on scanning Hartmann for imaging quality evaluation of large space telescopes
description	Abstract To test large-aperture space optical systems in a simple and highly efficient manner, the scanning Hartmann test (SHT) has been used to measure the sub-aperture wavefront slopes of optical systems by scanning with a collimated beam followed by retrieval of the overall wavefront form. However, the use of such a method contains a crucial flaw in that pointing errors of the translation stage can severely affect the test accuracy. Therefore, a multi-beam stitching method is proposed to correct pointing errors by stitching together data obtained by successive sub-aperture acquisition. In this paper, a test principle and a data processing method are detailed. Simulation results theoretically verify a high precision for the stitching algorithm. Furthermore, a multi-beam array stitching test system (MASTS) is developed and used to successfully test an actual space optical system of ∅800 mm. The MASTS shows a deviation of 1/50 λ (λ = 632.8 nm) root mean square (RMS) from the interferometric results and a repeatability of 1/80 λ RMS, which demonstrates high precision, high repeatability and low sensitivity to air turbulence compared to interferometric measurement. In future engineering applications, the MASTS has great potential to solve the test problems of space optical systems using ultra-large apertures.
format	article
author	Haisong Wei Haixiang Hu Feng Yan Xindong Chen Qiang Cheng Donglin Xue Xuejun Zhang
author_facet	Haisong Wei Haixiang Hu Feng Yan Xindong Chen Qiang Cheng Donglin Xue Xuejun Zhang
author_sort	Haisong Wei
title	Multi-beam array stitching method based on scanning Hartmann for imaging quality evaluation of large space telescopes
title_short	Multi-beam array stitching method based on scanning Hartmann for imaging quality evaluation of large space telescopes
title_full	Multi-beam array stitching method based on scanning Hartmann for imaging quality evaluation of large space telescopes
title_fullStr	Multi-beam array stitching method based on scanning Hartmann for imaging quality evaluation of large space telescopes
title_full_unstemmed	Multi-beam array stitching method based on scanning Hartmann for imaging quality evaluation of large space telescopes
title_sort	multi-beam array stitching method based on scanning hartmann for imaging quality evaluation of large space telescopes
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/cf114533246f458d9be19494689c6440
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_version_	1718384746653810688

Multi-beam array stitching method based on scanning Hartmann for imaging quality evaluation of large space telescopes

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