Visualization of additive-type moiré and time-average fringe patterns using the continuous wavelet transform
Applied Optics, Vol. 49, Issue 19, pp. 3640-3651 (2010)
http://dx.doi.org/10.1364/AO.49.003640
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Abstract
An application of the continuous wavelet transform to modulation extraction of additive moiré fringes and time-average patterns is proposed. We present numerical studies of the influence of various param eters of the wavelet transformation itself and a fringe pattern under study on the demodulation results. To facilitate the task of demodulating a signal with zero crossing values, a two-frame approach for wavelet ridge extraction is proposed. Experimental studies of vibration mode patterns by time-average interferometry provide excellent verification of numerical findings. They compare very well with the results of our previous investigations using the temporal phase-shifting method widely considered as the most accurate one. No need of performing phase shifting represents significant simplification of the experimental procedure.
© 2010 Optical Society of America
OCIS Codes
(100.7410) Image processing : Wavelets
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.4120) Instrumentation, measurement, and metrology : Moire' techniques
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis
ToC Category:
Instrumentation, Measurement, and Metrology
History
Original Manuscript: February 25, 2010
Manuscript Accepted: June 4, 2010
Published: June 22, 2010
Citation
Krzysztof Pokorski and Krzysztof Patorski, "Visualization of additive-type moiré and time-average fringe patterns using the continuous wavelet transform," Appl. Opt. 49, 3640-3651 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-19-3640
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