A diffraction-based optical method for the detection of in-plane motion of Lamb waves

Che Hua Yang*, Yua Ching Tsai

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

Abstract

This paper describes a laser optical technique that allows the detection of in-plane motion of Lamb waves. This interference-based laser optical technique includes a tiny square indentation with a width of about 30 μ, on the sample surface and a relatively simple optical arrangement. The current technique is applied for the detection of in-plane motions of Lamb waves propagating in a 70-μ thick brass plate. Measurement of So mode dominated by in-plane motion in the low f d (frequency times thickness) regime is successfully demonstrated with the current technique. With the indentation replaced by a microreflector in a microelectromechanical (MEMS) structure, this technique is applicable for the detection of in-plane motion in MEMS structures.

Original languageEnglish
Pages (from-to)1372-1377
Number of pages6
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume52
Issue number8
DOIs
StatePublished - 08 2005

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