Speckle displacement for general object deformaton of a curved surface

I. Yamaguchi

doi:10.1117/12.978998

11 September 2012 Speckle displacement for general object deformaton of a curved surface

I. Yamaguchi

Proceedings Volume 8413, Speckle 2012: V International Conference on Speckle Metrology; 841307 (2012) https://doi.org/10.1117/12.978998
Event: SPECKLE 2012: V International Conference on Speckle Metrology, 2012, Vigo, Spain

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.

Citation Download Citation

I. Yamaguchi "Speckle displacement for general object deformaton of a curved surface", Proc. SPIE 8413, Speckle 2012: V International Conference on Speckle Metrology, 841307 (11 September 2012); https://doi.org/10.1117/12.978998

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