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Phase or its associated derivative of signal carries very important information, particularly in the application of interferometry technique in non contact measurement, where measurand such as displacement, strain, velocity etc are encoded in the phase of a fringe signal. In most of the dynamic applications this interferometric signal becomes non stationary in nature. Fourier transform is not suitable...
Interferometry is well established technique for measuring particle velocity in shock wave physics experiments, where velocity information is encoded as the phase of a periodically varying intensity pattern. Conventional phase stepping technique by using a pair of quadrature signals cannot resolve rapid velocity changes and sub-fringe phenomena accurately in most of the velocimetry data. In this report...
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