Fluctuation elimination of fringe pattern to improve the accuracy of phase calculation

2011 ◽  
Author(s):  
Shujun Huang ◽  
Zonghua Zhang ◽  
Tong Guo ◽  
Sixiang Zhang ◽  
Xiaotang Hu
Keyword(s):  
Fringe Pattern ◽  
Phase Calculation

Multi-STFT for adaptive SCPS phase determination

2009 ◽  
Vol 17 (4) ◽  
Author(s):  
R. Sitnik
Keyword(s):  
Fourier Transform ◽  
Carrier Phase ◽  
Fringe Pattern ◽  
Phase Shifting ◽  
Shape Measurement ◽  
Step Method ◽  
Phase Determination ◽  
3D Shape Measurement ◽  
Phase Calculation ◽  
Carrier Phase Shifting

AbstractThis paper presents a fast and reliable approach for phase modulo 2π-calculation from a single fringe pattern. It calculates correct phase values even for very complex and variable shape gradients based on a locally variable fringe period determined for the entire image. In the paper, a new two-step method for wrapped phase calculation is proposed. It is performed through the use of a method based on a multiple local fast Fourier transform for estimation of a local fringes period map and a 5-point spatial carrier phase shifting (SCPS) formula for phase modulo 2π-calculation. The described approach is verified by a correct demodulation of a real fringe pattern taken by a 3D-shape measurement system.

Absolute phase calculation from one composite RGB fringe pattern image by wavelet transform algorithm

2011 ◽  
Author(s):  
Zhaohui Wang ◽  
Zhao Jing ◽  
Zonghua Zhang ◽  
Tong Guo ◽  
Sixiang Zhang ◽  
...  
Keyword(s):  
Wavelet Transform ◽  
Fringe Pattern ◽  
Absolute Phase ◽  
Phase Calculation

Quantization error of CCD cameras and their influence on phase calculation in fringe pattern analysis

2003 ◽  
Vol 42 (26) ◽  
pp. 5302 ◽  
Author(s):  
Oleksandr A. Skydan ◽  
Francis Lilley ◽  
Michael J. Lalor ◽  
David R. Burton
Keyword(s):  
Fringe Pattern ◽  
Pattern Analysis ◽  
Quantization Error ◽  
Ccd Cameras ◽  
Phase Calculation ◽  
Fringe Pattern Analysis

MODULATED FRINGE PATTERN PHOTOBLEACHING APPLIED TO LIPID-WATER CUBIC PHASES : STRUCTURAL INFORMATION

1990 ◽  
Vol 51 (C7) ◽  
pp. C7-105-C7-108
Author(s):  
S. CRIBIER ◽  
L. BOURDIEU ◽  
R. VARGAS ◽  
A. GULIK ◽  
V. LUZZATI
Keyword(s):  
Fringe Pattern ◽  
Structural Information ◽  
Cubic Phases

scholarly journals High-Resolution Photoabsorption Spectrum of Cs+ (5p61So + 5p5ns, nd) Between 504A and 600A using a Laser Ionized Cs Vapor Column

1984 ◽  
Vol 86 ◽  
pp. 124-124
Author(s):  
T.J. McIlrath ◽  
V. Kaufman ◽  
J. Sugar ◽  
W.T. Hill ◽  
D. Cooper
Keyword(s):  
High Resolution ◽  
Laser Pulse ◽  
High Voltage ◽  
Power Output ◽  
Random Phase ◽  
Grazing Incidence ◽  
Fano Resonances ◽  
Line Shapes ◽  
Phase Calculation ◽  
Photoabsorption Spectrum

Rapid ionization of Cs vapor in a heat pipe at 0.05 torr was achieved by pumping the 6s 2S½ – 7p 2P½ transition (f=0.007)1 with a flash-pumped dye laser at 4593.2A and I MW power output. Photoabsorptian initiated at the end of the laser pulse(≃ 0.5/s) showed the 5p5ns and nd series below and above the 5p52P3/2 threshold at 535.4A. Broad Beutler - Fano resonances appeared in the d series above threshold. The spectrum was recorded photographically on a 10.7m grazing incidence spectrograph using a continuum background generated by a BRV high-voltage spark source with a uranium anode. We will compare the line-shapes and the quantum defect (Lu-Fano2) plot with the predictions of a relativistic random phase calculation.

Vision-based system for simultaneous monitoring of shaft rotational speed and axial vibration using non-projection composite fringe pattern

2019 ◽  
Vol 120 ◽  
pp. 765-776 ◽  
Author(s):  
Jianfeng Zhong ◽  
Shuncong Zhong ◽  
Qiukun Zhang ◽  
Nuno Maia ◽  
Yaochun Shen ◽  
...  
Keyword(s):  
Rotational Speed ◽  
Fringe Pattern ◽  
Axial Vibration
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