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Proceedings Paper

Correlation techniques in speckle metrology and digital holography
Author(s): Ichirou Yamaguchi
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Paper Abstract

Uses of correlation functions of speckle patterns and the complex amplitude reconstructed by digital holography in measurements of shape and deformation of rough surfaces are described. First, theoretical relationships for correlation properties of the scattered light are surveyed. They consist of speckle displacement and decorrelation. Speckle displacement is applied to measurement of strain by a laser-speckle strain gauge and a speckle extensometer. Speckle decorrelation is used for the measurements of surface roughness and monitoring of paint drying process. The cross-correlation coefficient of the complex amplitude, named here, the complex coherence factor can be calculated in digital holography and used for measurement of surface shape and deformation. It is shown that these approaches are immune to speckle noise.

Paper Details

Date Published: 22 April 2008
PDF: 10 pages
Proc. SPIE 7008, Eighth International Conference on Correlation Optics, 70081E (22 April 2008); doi: 10.1117/12.797343
Show Author Affiliations
Ichirou Yamaguchi, Toyo Seiki Seisaku-sho, Ltd. (Japan)


Published in SPIE Proceedings Vol. 7008:
Eighth International Conference on Correlation Optics

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