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Opt Express. 2010 Nov 22;18(24):24405-11. doi: 10.1364/OE.18.024405.

Two-frame algorithm to design quadrature filters in phase shifting interferometry.

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Universidad Tecnológica de León, Blvd. Universidad Tecnológica # 225 San Carlos, León, Gto. 37670, México.


The main purpose of this paper is to present a method to design tunable quadrature filters in phase shifting interferometry. From a general tunable two-frame algorithm introduced, a set of individual filters corresponding to each quadrature conditions of the filter is obtained. Then, through a convolution algorithm of this set of filters the desired symmetric quadrature filter is recovered. Finally, the method is applied to obtain several tunable filters, like four and five-frame algorithms.

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