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.
© 1998 Optical Society of America
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