Results 201 to 210 of about 9,198 (256)
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The piston error recognition technique used in the modified Shack–Hartmann sensor
Optics Communications, 2021Abstract Segmented telescopes and multi-aperture telescopes are effective ways to realize high-resolution observations in astronomy. An important work for the high-resolution observations with segmented telescopes and multi-aperture telescopes is phasing the multiple segmented mirrors or sub-apertures.
Xiaoyang Li +4 more
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Measurement, 2021
Abstract In this study, we propose a 6N – 3 algorithm for suppressing the Zernike piston phase error by expanding 6N – 5 algorithm using algorithmic polynomial theory. We demonstrate that the proposed algorithm can be used for simultaneous measurement of the surface profile and thickness homogeneity by rotating the characteristic diagram on the ...
Jiwon Seo +4 more
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Abstract In this study, we propose a 6N – 3 algorithm for suppressing the Zernike piston phase error by expanding 6N – 5 algorithm using algorithmic polynomial theory. We demonstrate that the proposed algorithm can be used for simultaneous measurement of the surface profile and thickness homogeneity by rotating the characteristic diagram on the ...
Jiwon Seo +4 more
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Piston phase error due to bending of delivery fiber
SPIE Proceedings, 2007 Delivering coherently in phase high power laser beams by fiber optics to transmitter telescopes is desirable to Fourier Telescopy (FT) Imaging technique. One of the requirements to such delivery fibers is to maintain its optical path length while being bent over 150 degrees.
Xiaojiang J. Pan +2 more
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Detection and closed-loop control of piston errors for a Fizeau imaging interferometer
Applied Optics, 2020 In the Fizeau imaging interferometer testbed we recently built, the optical path difference (OPD; i.e., piston error) among three sub-telescopes should be corrected for phased imaging to enhance the spatial resolution. This study presents the detection of the OPD via a dispersed fringe sensor (DFS) method and its closed-loop control.
Aimin Jiang +5 more
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Error analysis of the piston estimation method in dispersed fringe sensor
Chinese Physics B, 2017 Dispersed fringe sensor (DFS) is an important phasing sensor of next-generation optical astronomical telescopes. The measurement errors induced by the measurement noise of three piston estimation methods for the DFS including least-squared fitting (LSF) method, frequency peak location (FPL) method and main peak position (MPP) method, are analyzed ...
Yang Li, Shengqian Wang, Changhui Rao
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Analysis of piston error of an optical sparse-aperture imaging system
SPIE Proceedings, 2009 With the development of Earth and Space missions, the quest for higher spatial resolution for telescopes will turn into urgent need. Optical sparse-aperture system can be designed to obtain high resolution in astronomical object imaging with several independent small-aperture telescopes.
Juan Zhao +5 more
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Error analysis for piston system
Measurement Techniques, 1976 G. N. Bobrovnikov, B. A. Karpov
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Standardizing the Permissible Mass Error in Monitoring Connecting Rods and Pistons
Russian Engineering Research, 2021 M. N. Erokhin +4 more
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The piston-balancing errors of weight-and-piston pressure gages
Measurement Techniques, 1959 В. Н. Самойлов
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Analysis of Piston Error for the Golay6 Configuration
Laser & Optoelectronics Progress, 2012 沈婷婷 Shen Tingting +4 more
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