Detection of inhomogeneities in semi solid materials using pulsed digital holography

Maria del Socorro Hernandez-Montes; Fernando Mendoza Santoyo; Carlos Perez-Lopez

doi:10.1117/12.556090

2 August 2004 Detection of inhomogeneities in semi-solid materials using pulsed digital holography

Maria del Socorro Hernandez-Montes, Fernando Mendoza Santoyo, Carlos Perez-Lopez

Proceedings Volume 5532, Interferometry XII: Applications; (2004) https://doi.org/10.1117/12.556090
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

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.

Citation Download Citation

Maria del Socorro Hernandez-Montes, Fernando Mendoza Santoyo, and Carlos Perez-Lopez "Detection of inhomogeneities in semi-solid materials using pulsed digital holography", Proc. SPIE 5532, Interferometry XII: Applications, (2 August 2004); https://doi.org/10.1117/12.556090

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