1 March 2000 Extension of the displacement measurement range for electronic speckle-shearing pattern interferometry using carrier fringes and a temporal-phase-unwrapping method
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Optical Engineering, 39(3), (2000). doi:10.1117/1.602423
Abstract
A technique for increasing the displacement measurement range in electronic speckle-shearing pattern interferometry is proposed. The technique is based on the introduction of carrier fringes and the use of a temporal-phase-unwrapping method to obtain larger measuring ranges of out-of-plane displacements of an object without sign ambiguities. A larger measuring range is obtained by dividing the desired maximum-phase range into several subranges where the spatial synchronous detection method can be successfully applied. These phase subranges correspond to small out-of-plane displacements of the object, and a speckle pattern is recorded for each displacement. The carrier fringes are obtained by the subtraction correlation of two consecutive speckle fields with a translation of the illuminating beam between recordings. The method allows the measurement of object displacements of about 216 ?m.
Rene A. Martinez-Celorio, Abundio Davila, Guillermo H. Kaufmann, Gabriel Mendiola, "Extension of the displacement measurement range for electronic speckle-shearing pattern interferometry using carrier fringes and a temporal-phase-unwrapping method," Optical Engineering 39(3), (1 March 2000). http://dx.doi.org/10.1117/1.602423
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KEYWORDS
Speckle pattern

Fringe analysis

Speckle

Interferometry

Optical fibers

Modulation

Signal to noise ratio

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