Noncontact determination of elastic moduli by two-dimensional Fourier transformation and laser ultrasonic technique
- 11 January 2005
- journal article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 76 (2)
- https://doi.org/10.1063/1.1850655
Abstract
Broadband laser ultrasonics and two dimensional Fourier transformation are used to characterize the properties of varieties of foils and plates. Laser ultrasonics generation is achieved by use of a pulsed laser which deposits pulsed laser energy on the surface of the specimen. The displacement amplitude of the resulting broadband ultrasonic modes are monitored using a two wave mixing photo-refractive interferometer. By applying a two dimensional Fourier transformation to the detected spatial and temporal displacement waveforms, the images of density of state (DOS) for the excited ultrasounds are obtained. Results are presented for a 150 um thick paper sample, a 52.8 um stainless steel foil and a 1.27 mm thick aluminum plate. The DOS image demonstrates the ability to measure the properties of each generated ultrasonic modes and provides a direct, non destructive, measure of elastic moduli of the tested specimensComment: Laser ultrasonics, Fourier transformation, NDT&E, Lamb waves, plate modeKeywords
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