Error-compensating phase-calculation algorithm in rapid-switching double-pulsed holographic interferometry

An algorithm is presented for calculating the phase difference that is obtained with rapid-switching, double-pulsed holographic interferometry. Imperfect switching between reference beams in between two laser pulses causes a distortion in the phase-stepped interferograms that results in erroneous ph...

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Bibliographic Details
Published in:Applied optics (2004) 1998-02, Vol.37 (4), p.753-758
Main Author: Timmerman, B H
Format: Article
Language:English
Online Access:Get full text
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Summary:An algorithm is presented for calculating the phase difference that is obtained with rapid-switching, double-pulsed holographic interferometry. Imperfect switching between reference beams in between two laser pulses causes a distortion in the phase-stepped interferograms that results in erroneous phase calculation when conventional phase-calculating algorithms are used. Instead of estimating the error that is involved, an extra step is added to a more conventional algorithm such as Carré's algorithm, so that this leakage effect is compensated for. Thus the desired phase difference is found. Also, a measure is found for excluding unreliable calculations, based on the light intensities and phase steps for each pixel and the leakage ratios.
ISSN:1559-128X
DOI:10.1364/AO.37.000753