A new direct method of continuous unwrapping phase from a single interferogram
Abstract
A new method recovers the phase difference of interfering wavefronts from a pattern of interference fringes, avoiding the phase discontinuity problem. The method relies on the numerical solution of one-dimensional first-order ordinary differential equations. The solution of each equation allows to compute a corresponding cross section of the two-dimensional phase, leading to the effective recovery of the phase surface. The unwrapping procedure can be performed in each orthogonal direction.
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