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Proceedings Paper

Detection of inhomogeneities in semi solid materials using pulsed digital holography
Author(s): Maria del Socorro Hernandez-Montes; Fernando Mendoza Santoyo; Carlos Perez-Lopez
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Paper Abstract

An out of plane optical sensitive configuration for pulsed digital holography was used to detect inhomogeneities inside semi solid organic materials. A loud speaker was employed to produce a mechanical wave that propagates through the material in such a way that it generates vibrational resonant modes and transient events on the material surface. Surface micro displacements were observed between the firing of two consecutive laser pulses, both for a steady resonant mode and for different times during the transient event. Two kinds of inhomogeneities were inserted approximately 2 cm inside the material diffracting the original mechanical wave and thus changing the resonant mode pattern or the transient wave on the surface. Comparison of phase unwrapped patterns, with and without inhomogeneities allows the rapid identification of their existence. The results for the resonant and transient conditions show that the method may be reliably used to study, compare and distinguish data from inside homogeneous and in-homogeneous organic materials.

Paper Details

Date Published: 2 August 2004
PDF: 6 pages
Proc. SPIE 5532, Interferometry XII: Applications, (2 August 2004); doi: 10.1117/12.556090
Show Author Affiliations
Maria del Socorro Hernandez-Montes, Ctr. de Investigaciones en Optica (Mexico)
Fernando Mendoza Santoyo, Ctr. de Investigaciones en Optica (Mexico)
Carlos Perez-Lopez, Ctr. de Investigaciones en Optica (Mexico)

Published in SPIE Proceedings Vol. 5532:
Interferometry XII: Applications
Wolfgang Osten; Erik Novak, Editor(s)

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