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= Digital methods for phase measurement = Measuring the phase of a sinusoidal signal is a crucial process in Interferometry and related disciplines. It usually involves two stages: phase demodulation and phase unwrapping. In terms of complex variable, phase demodulation is a linear problem where an analytic signal is estimated by processing real-valued input data. Finally, phase unwrapping is an inverse problem to cope with the $$2\pi$$ periodicity of the trigonometric functions.

Introduction
Digital interferometry refers to the collection of methods and algorithms used to recover information of interest that is modulated within one or more interferograms.