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Determination of the zero-order fringe position in digital speckle pattern interferometry

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Abstract

A method for determining the position of the zero-order fringe in a metrological experiment with digital speckle pattern interferometry is proposed. It is based on an averaging procedure with shifted images obtained before and after a load is applied. This technique is a complement to the phase-shifting methods. Experimental examples are shown.

© 1997 Optical Society of America

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