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Proceedings Paper

Speckle displacement for general object deformaton of a curved surface
Author(s): I. Yamaguchi
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Paper Abstract

Displacement of speckles arising from a curved surface subject to displacement or deformation is investigated by numerical simulations using a rough surface model that is represented by an assembly of point scatterers distributed around its mean surface. Speckle displacement in the diffraction field of an object illuminated by a narrow laser beam is derived from the peak position of the cross-correlation function between the 2-dimensional intensity signals recorded by a CCD before and after object deformation or displacement. The evaluated speckle displacement is compared with with those obtained from analytical approach for a flat mean surface. It has been shown that they agree well with each other. Then speckle displacement from a spherical surface is evaluated to indicate some differences in displacement sensitivities from a plane. This simulation can be applied to surface shape and roughness, and recording specifications.

Paper Details

Date Published: 11 September 2012
PDF: 6 pages
Proc. SPIE 8413, Speckle 2012: V International Conference on Speckle Metrology, 841307 (11 September 2012); doi: 10.1117/12.978998
Show Author Affiliations
I. Yamaguchi, RIKEN (Japan)

Published in SPIE Proceedings Vol. 8413:
Speckle 2012: V International Conference on Speckle Metrology
Ángel Fernandez Doval; Cristina Trillo, Editor(s)

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