Wide-Field Telescope Alignment Using the Model-Based Method Combined with the Stochastic Parallel Gradient Descent Algorithm

To acquire images with higher accuracy of wide-field telescopes, deformable mirrors with more than 100 actuators are used, making the telescope alignment more complex and time-consuming. Furthermore, the position of the obscuration caused by the secondary mirror in the experiment system is changed w...

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Autores principales:	Min Li, Ang Zhang, Junbo Zhang, Hao Xian
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	wide field of view telescope alignment deformable mirror model-based method SPGD algorithm Applied optics. Photonics TA1501-1820
Acceso en línea:	https://doaj.org/article/34bf20cdade54b74bd87a5dd5f44e16c
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id	oai:doaj.org-article:34bf20cdade54b74bd87a5dd5f44e16c
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spelling	oai:doaj.org-article:34bf20cdade54b74bd87a5dd5f44e16c2021-11-25T18:42:58ZWide-Field Telescope Alignment Using the Model-Based Method Combined with the Stochastic Parallel Gradient Descent Algorithm10.3390/photonics81104632304-6732https://doaj.org/article/34bf20cdade54b74bd87a5dd5f44e16c2021-10-01T00:00:00Zhttps://www.mdpi.com/2304-6732/8/11/463https://doaj.org/toc/2304-6732To acquire images with higher accuracy of wide-field telescopes, deformable mirrors with more than 100 actuators are used, making the telescope alignment more complex and time-consuming. Furthermore, the position of the obscuration caused by the secondary mirror in the experiment system is changed with the difference of fields of view, making the response matrix of the deformable mirror different in various fields of view. To solve this problem, transfer functions corresponding to different fields of view are calculated according to the wavefront edge check and boundary conditions. In this paper, a model-based method combined with the stochastic parallel gradient descent (SPGD) algorithm is used. The experiment results show that our method can correct the aberrations with a high accuracy in both on-axis and off-axis fields, indicating that the effective actuators are well chosen corresponding to different fields of view.Min LiAng ZhangJunbo ZhangHao XianMDPI AGarticlewide field of viewtelescope alignmentdeformable mirrormodel-based methodSPGD algorithmApplied optics. PhotonicsTA1501-1820ENPhotonics, Vol 8, Iss 463, p 463 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	wide field of view telescope alignment deformable mirror model-based method SPGD algorithm Applied optics. Photonics TA1501-1820
spellingShingle	wide field of view telescope alignment deformable mirror model-based method SPGD algorithm Applied optics. Photonics TA1501-1820 Min Li Ang Zhang Junbo Zhang Hao Xian Wide-Field Telescope Alignment Using the Model-Based Method Combined with the Stochastic Parallel Gradient Descent Algorithm
description	To acquire images with higher accuracy of wide-field telescopes, deformable mirrors with more than 100 actuators are used, making the telescope alignment more complex and time-consuming. Furthermore, the position of the obscuration caused by the secondary mirror in the experiment system is changed with the difference of fields of view, making the response matrix of the deformable mirror different in various fields of view. To solve this problem, transfer functions corresponding to different fields of view are calculated according to the wavefront edge check and boundary conditions. In this paper, a model-based method combined with the stochastic parallel gradient descent (SPGD) algorithm is used. The experiment results show that our method can correct the aberrations with a high accuracy in both on-axis and off-axis fields, indicating that the effective actuators are well chosen corresponding to different fields of view.
format	article
author	Min Li Ang Zhang Junbo Zhang Hao Xian
author_facet	Min Li Ang Zhang Junbo Zhang Hao Xian
author_sort	Min Li
title	Wide-Field Telescope Alignment Using the Model-Based Method Combined with the Stochastic Parallel Gradient Descent Algorithm
title_short	Wide-Field Telescope Alignment Using the Model-Based Method Combined with the Stochastic Parallel Gradient Descent Algorithm
title_full	Wide-Field Telescope Alignment Using the Model-Based Method Combined with the Stochastic Parallel Gradient Descent Algorithm
title_fullStr	Wide-Field Telescope Alignment Using the Model-Based Method Combined with the Stochastic Parallel Gradient Descent Algorithm
title_full_unstemmed	Wide-Field Telescope Alignment Using the Model-Based Method Combined with the Stochastic Parallel Gradient Descent Algorithm
title_sort	wide-field telescope alignment using the model-based method combined with the stochastic parallel gradient descent algorithm
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/34bf20cdade54b74bd87a5dd5f44e16c
work_keys_str_mv	AT minli widefieldtelescopealignmentusingthemodelbasedmethodcombinedwiththestochasticparallelgradientdescentalgorithm AT angzhang widefieldtelescopealignmentusingthemodelbasedmethodcombinedwiththestochasticparallelgradientdescentalgorithm AT junbozhang widefieldtelescopealignmentusingthemodelbasedmethodcombinedwiththestochasticparallelgradientdescentalgorithm AT haoxian widefieldtelescopealignmentusingthemodelbasedmethodcombinedwiththestochasticparallelgradientdescentalgorithm
_version_	1718410763459100672

Wide-Field Telescope Alignment Using the Model-Based Method Combined with the Stochastic Parallel Gradient Descent Algorithm

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