Results 301 to 310 of about 8,935,486 (331)

Algorithm immune to tilt phase-shifting error for phase-shifting interferometers

Applied Optics, 2000
As a phase shifter usually suffers from both translational and tilt-shift errors during shifting, so every pixel in the same interferogram will have a different phase-shift value. Thus nonlinear phase-measurement errors cannot be avoided, but even translational-shift error has been corrected effectively.
M, Chen, H, Guo, C, Wei
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Phase-shifting error and its elimination in phase-shifting digital holography

Optics Letters, 2002
We investigate the influence of phase-shifting error on the quality of the reconstructed image in digital holography and propose a method of error elimination for a perfect image. In this method the summation of the intensity bit errors of the reconstructed image is taken as an evaluation function for an iterative algorithm to find the exact phase ...
Cheng-Shan, Guo, Li, Zhang, Hui-Tian, Wang, Jun, Liao, Y Y, Zhu   +4 more
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Iterative phase-shifting algorithm immune to random phase shifts and tilts

Applied Optics, 2013
An iterative phase-shifting algorithm based on the least-squares principle is developed to overcome the random piston and tilt wavefront errors generated from the phase shifter. The algorithm iteratively calculates the phase distribution and the phase-shifting map to minimize the sum of squared errors in the interferograms.
Yi-Chun, Chen, Po-Chih, Lin, Chung-Min, Lee, Chao-Wen, Liang   +3 more
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Phase-shifting shearing interferometer

Optics Letters, 2001
A single-element phase-shifting interferometer has been developed based on the lateral shearing interferometer. This new interferometer requires no precise alignment, and the phase is continuously varied by changes in the voltage across a commercially available liquid-crystal phase retarder.
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Random phase-shifting algorithm by constructing orthogonal phase-shifting fringe patterns

Applied Optics, 2017
The intensity distribution of fringe patterns becomes nonsinusoidal in real testing environments. Thus, the performance of existing phase shift extraction algorithms, which usually compute the desired phase shift by arccosine function or arcsine function, may be affected. In the presented paper, we report an arctangent-function-based technique to solve
Hubing, Du, Jingjing, Yan, Jianhua, Wang
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Multichannel phase-shifted interferometer

Optics Letters, 1984
A new real-time interferometer based on diffraction phenomena is discussed. It consists of a point-diffraction interferometer fabricated on a transmission grating. The real-time data-analysis capability is achieved by simultaneously introducing a phase shift (piston) on the three separate channels of diffracted interferograms. Mathematical analysis and
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Phase shift reticles

International Electron Devices Meeting 1991 [Technical Digest], 2002
The authors propose a novel phase-shifting reticle structure with two shifter layers. Experimental results show the effectiveness of the two shifter layers for repairing defects. A novel phase-shifter fabrication technique for the proposed structure is also demonstrated.
S. Okazaki, N. Hasegawa, A. Imai
openaire   +1 more source

Phase-Shift Oscillators

Proceedings of the IRE, 1941
This paper describes a type of resistance-capacitance-tuned oscillator which operates with a single tube. A three- or more mesh phase-shifting network is connected between the output and input of an amplifier tube. When the gain of the amplifier is adjusted either manually or by an automatic-volume-control circuit barely to maintain oscillation, almost
E.L. Ginzton, L.M. Hollingsworth
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Phase-shift controlling of three solitons in dispersion-decreasing fibers

Nonlinear dynamics, 2019
Suzhi Liu, Qin Zhou, A. Biswas, Wenjun Liu   +3 more
semanticscholar   +1 more source

phase shift

2011
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