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Optical Engineering

Statistics of the dynamic speckle produced by a rotating diffuser and its application to the assessment of paint drying
Author(s): Graciela Romero; Elvio Alanis; Hector Jorge Rabal
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Paper Abstract

. We explore alternative ways to assign a measure to dynamic speckle patterns produced by different phenomena. Both the power spectrum and the autocorrelation of the intensity are considered. First, we describe an experimental study of the statistics of the Fresnel speckle patterns produced by illuminating a diffuser with laser light as a phenomenon where some control can be maintained on the dynamic variables. The diffuser rotates in a plane with constant angular speed. A correlation is established between some parameters of the autocorrelation or the power spectrum of the intensity fluctuations of the speckle patterns and the tangential speed corresponding to different distances from the rotation axis. A scale correction is suggested to estimate the number of points of the autocorrelation function that should be included in the calculations before speckle crosstalk starts. The defined parameters are then applied to characterize the activity of the dynamical speckle produced in the drying of paint. This is considered as a starting point for the understanding and assessment of more complex situations including biological activity.

Paper Details

Date Published: 1 June 2000
PDF: 7 pages
Opt. Eng. 39(6) doi: 10.1117/1.602542
Published in: Optical Engineering Volume 39, Issue 6
Show Author Affiliations
Graciela Romero, Univ. Nacional de Salta (Argentina)
Elvio Alanis, Univ. Nacional de Salta (Argentina)
Hector Jorge Rabal, Centro de Investigaciones Opticas (Argentina)

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