A Secondary Mirror Alignment Method For Segmented Telescopes Using A Wavefront Sensor-less Method

The precise secondary mirror alignment is a key factor to ensure the imaging quality of a segmented telescope with a high resolution demand. In this paper, a two-step alignment method using an improved stochastic parallel gradient descent (SPGD) algorithm called Nadam SPGD algorithm is proposed. Sim...

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Bibliographic Details
Published in:IEEE photonics technology letters Vol. 36; no. 6; p. 1
Main Authors: Li, Min, Liu, Xin, Zhang, Ang, Zhang, Junbo, Xian, Hao
Format: Journal Article
Language:English
Published: New York IEEE 15.03.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Adaptive optics
Algorithms
Alignment
Apertures
Image quality
Image segmentation
large apertures
Mirrors
Optimization
Position errors
Primary mirrors
secondary mirror alignment
Secondary mirrors
segmented telescopes
stochastic parallel gradient descent (SPGD) algorithm
Telescopes
Wave front sensors
Wave fronts
wavefont sensor-less method
ISSN:1041-1135, 1941-0174
Online Access:Get full text
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Summary:The precise secondary mirror alignment is a key factor to ensure the imaging quality of a segmented telescope with a high resolution demand. In this paper, a two-step alignment method using an improved stochastic parallel gradient descent (SPGD) algorithm called Nadam SPGD algorithm is proposed. Simulation results show that our method can distinguish aberrations caused by phase errors of the primary mirror and position errors of the secondary mirror precisely, and align the secondary mirror quickly and accurately. The improved SPGD algorithm can enhance the correction efficiency by more than two times compared with the traditional SPGD algorithm.
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ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2024.3363210