Results 11 to 20 of about 58,854 (258)
Active optics: deformable mirrors with a minimum number of actuators [PDF]
Journal of the European Optical Society-Rapid Publications, 2012 We present two concepts of deformable mirror to compensate for first order optical aberrations. Deformation systems are designed using both elasticity theory and Finite Element Analysis in order to minimize the number of actuators.
Laslandes M., Hugot E., Ferrari M.
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Micromachines, 2023 This paper explores advanced shape control techniques for ultra-lightweight electro-actuated polymers with composite ferroelectric thin films. It begins with an overview of PVDF-TrFE film actuators used in the development of thin-shell composites ...
Kainan Wang +3 more
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Fast High-Resolution Phase Diversity Wavefront Sensing with L-BFGS Algorithm
Sensors, 2023 The presence of manufacture error in large mirrors introduces high-order aberrations, which can severely influence the intensity distribution of point spread function.
Haoyuan Zhang +6 more
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In-Situ Metrology of Large Segmented Detector Based on Modified Optical Truss
IEEE Photonics Journal, 2023 To precisely map cosmic structures and capture time-domain events, future large survey telescopes will be equipped with segmented detectors that greatly expand their field of view. Segment flatness and assembly accuracy will be essential for them to make
Qichang An +6 more
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Active Optics—Advances of Cycloid-like Variable Curvature Mirrors for the VLTI Array
Photonics, 2022 Elasticity theory and active optics led us to the discovery of three geometrical configurations of variable curvature mirrors (VCMs) that are either cycloid-like or tulip-like thickness distributions. Cycloid-like VCMs are generated by a uniform load—air
Gerard Rene Lemaitre +5 more
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Active Support System for the Correction of a 4m SiC Primary Mirror Based on the Bending Mode
Applied Sciences, 2023 Active optics is a key technology in ground-based large-aperture telescopes. The active correction of the surface shape of the primary mirror is used to reduce the surface shape error and improve the imaging quality.
Zhiyuan Yu, Xiaoxia Wu, Fuguo Wang
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Micromachines, 2023 An active optical system with three segmented mirrors was proposed to verify the co-focus and co-phase progress. In this system, a kind of large-stroke and high-precision parallel positioning platform was specially developed to help support the mirrors ...
Zihao Yin +6 more
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Applied Sciences, 2022 Studying how to use the coupling characteristics of net aberration fields induced by different perturbation parameters to realize the wave aberration compensation correction of perturbed telescopes is of great significance for the development of active ...
Jinxin Wang +4 more
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IEEE Access, 2020 In the co-phasing techniques applied to the segmented telescope, a Shack-Hartmann wavefront sensor cannot accurately detect the piston error of the segment. Although the phase diversity (PD) algorithm can detect the piston error of each segment, it fails
Haifeng Cao +4 more
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Coarse Phasing Detection Using Multiwavelength Wavefront
Photonics, 2023 Presently, the segmented mirror is the mainstream development direction of large-aperture telescopes. The key problem affecting the performance of segmented mirror telescopes concerns the co-phase of the segments. The segments’ co-phase includes the fine
Rongjie Qin, Zihao Yin, Yinnian Liu
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