Optical technique for examining materials’ elastic properties

Borja Sorazu; Brian Culshaw; Gareth Pierce

doi:10.1117/12.600999

16 May 2005 Optical technique for examining materials' elastic properties

Borja Sorazu, Brian Culshaw, Gareth Pierce

Proceedings Volume 5758, Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems; (2005) https://doi.org/10.1117/12.600999
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2005, San Diego, California, United States

Abstract

In this work we present a successful non-contact ultrasound laser generation and detection system for the extraction of the structural properties on mechanical structures. The system uses a Q-switch Nd:YAG short pulse high power laser to generate a broadband source of Lamb waves that propagate along the plate, interacting with the structure’s entire thickness. A modified Michelson surface displacement optical fibre interferometer is used for the detection of the stress and strain waves. In order to extract the structural information stored in the generated and detected waves we present two completely different signal processing tools; the reassigned spectrogram as a time-frequency analysis and the two dimensional Fourier transform. We compare these two techniques and extract interesting conclusions of their properties. Finally we apply these two techniques and the developed system to temperature change sensitivity and damage detection applications.

Citation Download Citation

Borja Sorazu, Brian Culshaw, and Gareth Pierce "Optical technique for examining materials' elastic properties", Proc. SPIE 5758, Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems, (16 May 2005); https://doi.org/10.1117/12.600999

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