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An Optical Method for the Detection of In-Plane Motion of Acoustic Waves Propagating in Solids

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Abstract:

A new interference-based optical technique called in-plane displacement interferometer (IPDI) is introduced for the detection of in-plane (IP) motion of ultrasonic waves. The IPDI employs a tiny square indentation of about 30 microns in width on the sample surface and a relatively simple optical arrangement for the detection of IP motion of ultrasonics waves. With the IPDI, measurement of IP motions of Lamb waves propagating along a thin brass foil is demonstrated. Dispersion relations for the S0 mode dominated by in-plane motion in the low fd (frequency times thickness) regime is obtained with the IPDI.

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Periodical:

Key Engineering Materials (Volumes 321-323)

Pages:

91-94

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.321-323.91

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Online since:

October 2006

Authors:

Che Hua Yang, Yua Ching Tsai

Keywords:

Indentation, In-Plane Motion, Lamb Wave, Laser Ultrasound

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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