, Volume 46, Issue 6, pp 713-723
Date: 22 Aug 2006

Measurement of Deformation by Means of Correlation of Speckle Fields

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Abstract

The paper includes the description of non-contact measurement of object deformation by means of correlation of speckle fields. This optical method uses statistical properties of speckle patterns for the detection of the components of the small deformation tensor of an elementary area of a surface of an object under investigation. The theoretical background of this method is briefly described and important equations are mentioned. Suitable experimental set-ups for measurement of specific elongation ɛ xx are introduced and their advantages are discussed. Concrete example of measurement, where the investigated object is a specimen of rubber commonly used in tire making industry, is presented including achieved results.