Results 161 to 170 of about 325,753 (218)
MEMS mirror with tip or piston motion for use in adaptive optics
The Journal of the Acoustical Society of America, 2008 An array of high fill factor mirrors has each mirror be coupled across two deformable spring bars that are deformed using a drive. The two deformable springs are parallel to each other, and coupled together, e.g., by a cross bar. A support is coupled at one end to the cross bar and at its opposite end to the mirror. Coupled across the deformable spring
Dennis S. Greywall
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In situ pressure calibration for piston cylinder cells via ruby fluorescence with fiber optics
Review of Scientific Instruments, 2007 A fiber-optic measurement technique is developed for estimating the pressure inside a piston cylinder cell up to approximately 4 GPa, based on the pressure-induced R1 fluorescence line shift of ruby (ruby scale).
K Koyama-Nakazawa +3 more
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<title>High-accuracy white-light optical piston sensor for segmented optics</title>
SPIE Proceedings, 1993 A novel piston sensing concept is described for measuring piston over the +/- 0.5 wave range. The image of a white light point source is optically processed using a half-wave phase plate to enhance the presence of piston in the incident wavefront. The resultant point spread function is recorded on a CCD camera and analyzed using a simple intensity ...
Alan Wertheimer, Thomas W. Dey
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Piston alignment of segmented optical mirrors via convolutional neural networks
Optics Letters, 2018Most of the methods used today for the alignment of segmented mirrors are based on Shack-Hartman wavefront sensors. Other proposed methods are based on curvature sensors. These can be used to cross-check the measurements given by the primary method. We investigate a different approach which employs convolutional neural networks.
Dailos Guerra-Ramos +3 more
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Wide-range, high-accuracy, white light piston sensor for segmented optics
Optical Engineering, 1995 Optical systems with segmented mirrors require precision coalignment of their segments to attain the desired performance. A novel sensor for measuring piston over a ± 10 wave range by analyzing the image of a white light point source is described. The sensor combines a Young's two-slit aperture pair for coarse sensing with another set of apertures ...
Alan Wertheimer
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The 17th Annual Meeting of the IEEELasers and Electro-Optics Society, 2004. LEOS 2004., 2004 David Moalem Maron +18 more
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2009 IEEE 22nd International Conference on Micro Electro Mechanical Systems, 2009 Martin Lapisa +4 more
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Model-based large-dynamic iterative piston correction using extended objects.
Optics Letters, 2023Cophasing is crucial for segmented or sparse aperture telescopes to achieve high resolution. In this Letter, we propose a novel, to the best of our knowledge, model-based piston correction method that can remove large-scale piston errors within a few ...
Zexia Zhang, Bing Dong
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Design and development of a 331-segment tip–tilt–piston mirror array for space-based adaptive optics
, 2007 Jason B. Stewart +5 more
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Astronomical Telescopes + Instrumentation, 2022
The success of the Keck telescopes’ segmented mirror technology provided a basis for the development of other large and extremely large telescopes. We investigate ways to optimize the performance of the segmented mirror telescope further to (1) take on ...
S. Ragland, L. Gers
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The success of the Keck telescopes’ segmented mirror technology provided a basis for the development of other large and extremely large telescopes. We investigate ways to optimize the performance of the segmented mirror telescope further to (1) take on ...
S. Ragland, L. Gers
semanticscholar +1 more source