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Proceedings Paper

How knowledge about speckle intensity and phase gradients can improve electronic speckle pattern interferometry
Author(s): Heinz Helmers; Jan Burke
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Paper Abstract

As is well known, the spatial coherence in a speckle field is limited to an area called the mean speckle size. Throughout this area, the coherence decays smoothly from the center to the margin of a speckle, and the degree of coherence between two points (x1,y1) and (x2,y2) determines the probable amount of deviations between their intensities I1, I2 and phases. These deviations are of special importance when spatial phase shifting is applied in electronic speckle pattern interferometry. We demonstrate that the knowledge about the intensity and phase gradients in the object speckle pattern can be used to reduce the noise in measured deformation maps significantly.

Paper Details

Date Published: 19 July 1999
PDF: 2 pages
Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); doi: 10.1117/12.355083
Show Author Affiliations
Heinz Helmers, Carl von Ossietzky Univ. Oldenburg (Germany)
Jan Burke, Carl von Ossietzky Univ. Oldenburg (Germany)

Published in SPIE Proceedings Vol. 3749:
18th Congress of the International Commission for Optics
Alexander J. Glass; Joseph W. Goodman; Milton Chang; Arthur H. Guenther; Toshimitsu Asakura, Editor(s)

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