Temporal phase unwrapping is applied to a two-camera polarization
phase-stepped system. A simple algorithm for the phase-change
calculation is given, together with simulations, to indicate its
validity and strength. This method can be applied directly for
detection of phase changes as a function of time. It is proposed to
use this method in a shearography setup. The phase distribution in
the shearogram can then be obtained, without the standard 2π
ambiguities, by application of the required total shear in a number of
smaller steps, provided that each step is small enough to be free from
these 2π phase steps.
© 1998 Optical Society of America
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