The dynamic system analysis capability of dynamic mode decomposition (DMD) technique is utilized for the phase retrieval in phase shifting interferometry. The DMD decomposes the spatio-temporal interferometric data into three distinct spatial fields (modes) which represent the background intensity and complex amplitudes associated with the interferogram. The phase estimate can be obtained from one of these modes which oscillates with a temporal frequency equal to the phase shift. Two DMD-based algorithms are reported which operate with minimum four interferograms, and accumulated phase shift of π. The comparative study among the DMD-based and the least-squares, PCA, 4-bucket, 5-bucket and 7-bucket algorithms performed in function of signal-to-noise ratio, phase-shift miscalibration, and amplitude and frequency of vibration demonstrates the suitability of proposed algorithm in practical scenarios.
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