Results 211 to 220 of about 10,061 (256)
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Error analysis for piston system
Measurement Techniques, 1976G N Bobrovnikov, Bobrovnikov G N
exaly +2 more sources
Performance Comparison of Piston Error Extraction Methods from Interference Patterns
Journal of Russian Laser Research, 2022Bincheng Li, Li Bincheng, Xian Hao
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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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Detection and closed-loop control of piston errors for a Fizeau imaging interferometer
Applied Optics, 2020In 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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Piston phase error due to bending of delivery fiber
SPIE Proceedings, 2007Delivering 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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Efficient method for the reduction of large piston errors in segmented-mirror telescopes
SPIE Proceedings, 2004Phase discontinuity sensing (PDS) is one of two successful approaches to segment phasing that are currently in use at the Keck telescopes, but it has only a limited capture range. We describe and present numerical simulations of a broadband version of the current (narrowband) PDS algorithm that can extend the capture range from 0.4 to 40 microns.
Gary, Chanan, Agustí, Pintó
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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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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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Research of Kinematic and Dynamic Errors of Crank-Piston Mechanisms
2016The issue of determination of errors and precision of mechanisms and machines always presents an important problem. This problem is rather urgent in machine building, agriculture machinery, food industry, instrument engineelink and other fields of industry.
Nodar Davitashvili, Valeh Bakhshaliev
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Analysis of piston error of an optical sparse-aperture imaging system
SPIE Proceedings, 2009With 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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