Picture of a sphere with binary code

Making Strathclyde research discoverable to the world...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. It exposes Strathclyde's world leading Open Access research to many of the world's leading resource discovery tools, and from there onto the screens of researchers around the world.

Explore Strathclyde Open Access research content

Optical technique for examining materials' elastic properties

Culshaw, B. and Sorazu, B.L. and Pierce, S.G. (2005) Optical technique for examining materials' elastic properties. In: Proceedings of SPIE - The International Society for Optical Engineering, 1900-01-01.

Full text not available in this repository. (Request a copy from the Strathclyde author)

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.