Telescope Alignment Method Using a Modified Stochastic Parallel Gradient Descent Algorithm
To satisfy the demands of high image quality and resolutions, telescope alignment is indispensable. In this paper, a wavefront sensorless method based on a modified stochastic parallel gradient descent algorithm (SPGD) called the adaptive moment estimation SPGD (Adam SPGD) algorithm is proposed. Sim...
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MDPI AG
2024-10-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/11/11/993 |
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| author | Min Li Xin Liu Junbo Zhang Hao Xian |
| author_facet | Min Li Xin Liu Junbo Zhang Hao Xian |
| author_sort | Min Li |
| collection | DOAJ |
| description | To satisfy the demands of high image quality and resolutions, telescope alignment is indispensable. In this paper, a wavefront sensorless method based on a modified stochastic parallel gradient descent algorithm (SPGD) called the adaptive moment estimation SPGD (Adam SPGD) algorithm is proposed. Simulations are carried out using a four-mirror telescope, whose aperture is 6 m and fields of view are Φ2°. Three misalignments are shown as examples. Positions of the secondary mirror and third mirror are employed to compensate aberrations. The results show that merit functions and energy distributions of corrected images match with the designed ones. The mean RMS of residual wavefront errors is smaller than <i>λ</i>/14 (<i>λ</i> = 0.5 μm), indicating that the misalignments are well compensated. The results verify the effectiveness of our method. |
| format | Article |
| id | doaj-art-106d28ea52d3457a88baed8ffe1384f7 |
| institution | OA Journals |
| issn | 2304-6732 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | MDPI AG |
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| series | Photonics |
| spelling | doaj-art-106d28ea52d3457a88baed8ffe1384f72025-08-20T01:53:57ZengMDPI AGPhotonics2304-67322024-10-01111199310.3390/photonics11110993Telescope Alignment Method Using a Modified Stochastic Parallel Gradient Descent AlgorithmMin Li0Xin Liu1Junbo Zhang2Hao Xian3National Laboratory on Adaptive Optics, Chengdu 610209, ChinaInstitute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, ChinaNational Laboratory on Adaptive Optics, Chengdu 610209, ChinaNational Laboratory on Adaptive Optics, Chengdu 610209, ChinaTo satisfy the demands of high image quality and resolutions, telescope alignment is indispensable. In this paper, a wavefront sensorless method based on a modified stochastic parallel gradient descent algorithm (SPGD) called the adaptive moment estimation SPGD (Adam SPGD) algorithm is proposed. Simulations are carried out using a four-mirror telescope, whose aperture is 6 m and fields of view are Φ2°. Three misalignments are shown as examples. Positions of the secondary mirror and third mirror are employed to compensate aberrations. The results show that merit functions and energy distributions of corrected images match with the designed ones. The mean RMS of residual wavefront errors is smaller than <i>λ</i>/14 (<i>λ</i> = 0.5 μm), indicating that the misalignments are well compensated. The results verify the effectiveness of our method.https://www.mdpi.com/2304-6732/11/11/993telescope alignmentwavefront sensorless methodAdam SPGD algorithmmulti-field alignmenthigh precision |
| spellingShingle | Min Li Xin Liu Junbo Zhang Hao Xian Telescope Alignment Method Using a Modified Stochastic Parallel Gradient Descent Algorithm Photonics telescope alignment wavefront sensorless method Adam SPGD algorithm multi-field alignment high precision |
| title | Telescope Alignment Method Using a Modified Stochastic Parallel Gradient Descent Algorithm |
| title_full | Telescope Alignment Method Using a Modified Stochastic Parallel Gradient Descent Algorithm |
| title_fullStr | Telescope Alignment Method Using a Modified Stochastic Parallel Gradient Descent Algorithm |
| title_full_unstemmed | Telescope Alignment Method Using a Modified Stochastic Parallel Gradient Descent Algorithm |
| title_short | Telescope Alignment Method Using a Modified Stochastic Parallel Gradient Descent Algorithm |
| title_sort | telescope alignment method using a modified stochastic parallel gradient descent algorithm |
| topic | telescope alignment wavefront sensorless method Adam SPGD algorithm multi-field alignment high precision |
| url | https://www.mdpi.com/2304-6732/11/11/993 |
| work_keys_str_mv | AT minli telescopealignmentmethodusingamodifiedstochasticparallelgradientdescentalgorithm AT xinliu telescopealignmentmethodusingamodifiedstochasticparallelgradientdescentalgorithm AT junbozhang telescopealignmentmethodusingamodifiedstochasticparallelgradientdescentalgorithm AT haoxian telescopealignmentmethodusingamodifiedstochasticparallelgradientdescentalgorithm |