Results 211 to 220 of about 9,198 (256)
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Accurate piston error detection unaffected by tip-tilt error
2019 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 2020Astronomical observation wants more distant and fainter object with a better resolution, larger primary mirror telescopes are needed to improve the diffraction limit and increase the collected light energy, but limited by monolithic primary mirror manufacture, testing, transportation and launch. And segmented telescopes can address these.
Lu Zhang +3 more
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Retrieving Inter-Segment Piston Error Using Broadband Light
Frontiers in Optics 2016, 2016Traditional phase retrieval methods fail to retrieve piston errors greater than 0.5 waves in segmented systems because of 2π ambiguities. We present and characterize an algorithm that uses broadband light to determine such piston errors.
Scott W. Paine, James R. Fienup
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Piston and Tip-Tilt Error Analysis of Segmented Diffractive Lens
Acta Optica Sinica, 2018 李韬杰 Li Taojie +5 more
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Eliminating the longitudinal piston error between tiled gratings by angle tuning
Optics Letters, 2007In a tiled-grating system, it is difficult to make two tiled gratings strictly coplanar. We propose and demonstrate for the first time, as far as we know, a simple method by which the longitudinal piston error between two tiled gratings can be reduced below lambda/10, close to the influence of the environmental factors.
Yanlei, Zuo +7 more
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Cross-fringe technique for sensing piston errors of segmented mirror telescope
Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 2020For the disaster prevention and mitigation, large segmented Earth observation telescope in the geostationary orbit is studied in JAXA. In order to obtain diffraction limited performance with the segmented telescope, it is necessary to co-phase the segmented primary mirrors with sub-wavelength accuracy.
Seichi Sato +3 more
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Errors inherent in the use of piston activated pipettes
Analytical Biochemistry, 1973Abstract The accuracy and reproducibility of the volume of solution delivered from a number of piston-activated pipettes of different makes and sizes has been tested under a variety of experimental conditions. The results indicate that these devices deliver the nominal volume only when both the solution to be sampled, and the whole pipette are at the
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A piston error detection method of optical synthetic aperture system
SPIE Proceedings, 2014The existence of phase error influences the imaging performance of optical synthetic aperture system and limits the resolution of the imaging system. The relationship between point spread function of binocular system and piston error is analyzed and the conclusion that the relation between point spread function and piston error is irrational with ...
Xiaofeng Wei +3 more
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Error Control of Piston and Tilt Based on SPGD in Coherent Beam Combination
Chinese Journal of Lasers, 2014 母杰 Mu Jie +5 more
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MTF non-redundant distribution for multi-piston errors detection of segmented telescopes
2019 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 2020We propose a MTF non-redundant distribution method, with which the multi-piston errors of segmented telescope can be detected simultaneously. A mask with a sparse multi-subaperture configuration is set in the exit pupil of the segmented telescope. One subaperture matches to one segment and samples the wave-front reflected by this segment.
Weirui Zhao +3 more
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