Abstract

This paper proposes an optical speckle-correlation method for plotting displacement and strain fields on the surfaces of samples of structural materials. The method is implemented using computer models of a linear joint transform (JT) correlator, a JT correlator with medial and local-medial threshold, and also a JT correlator with a band-equalization filter. The errors of the surface displacements on test speckle patterns and actual speckle patterns are analyzed. Results are presented for calculations of the displacement fields of the strained surface of a duralumin sample, obtained by means of computer models developed for the JT correlator. © 2004 Optical Society of America

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