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Proceedings Paper

Speckle correlation of changing surfaces
Author(s): Maria Fernanda Ruiz Gale; Elsa N. Hogert; Nestor G. Gaggioli
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Paper Abstract

The study of light scattered from changing surfaces is of great interest because of its application in aging control of mechanical components and other problems. In many situations it is important to know the roughness changes in dielectric or metallic surfaces. Often, this roughness variation must be determined in a non-destructive way. In this work it is reported some new results related with the study of roughness variations. In recent works were presented some aspects of a developed theoretical model that relates the speckle correlation with changes in the surface roughness. This model is valid for dielectric or metallic surfaces, however, for the sake of simplicity, it is studied a translucent diffuser. It is recorded the transmitted speckle pattern for a translucent rough surface before and after it suffers a change, and then it is calculate the correlation between both speckle patterns. The roughness is changed in a controlled way by means of immersion liquids of different refractive indices. A good agreement between the theoretical description and experimental results obtained in quasi-real time is achieved.

Paper Details

Date Published: 27 May 2003
PDF: 6 pages
Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003); doi: 10.1117/12.516627
Show Author Affiliations
Maria Fernanda Ruiz Gale, Comision Nacional de Energia Atomica (Argentina)
Elsa N. Hogert, Comision Nacional de Energia Atomica (Argentina)
Nestor G. Gaggioli, Comision Nacional de Energia Atomica (Argentina)

Published in SPIE Proceedings Vol. 4933:
Speckle Metrology 2003
Kay Gastinger; Ole Johan Lokberg; Svein Winther, Editor(s)

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