Article

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

Department of Mechanical Engineering, Chang Gung University, Kwei-Shan, Taoyuan, Taiwan.
IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control (impact factor: 1.69). 09/2005; 52(8):1372-7.
Source: PubMed

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 micron 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-micron thick brass plate. Measurement of So mode dominated by in-plane motion in the low fd (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.

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Keywords

30 micron
 
70-micron thick brass plate
 
current technique
 
detection
 
frequency times thickness
 
indentation
 
interference-based laser optical technique
 
Lamb waves
 
Lamb waves propagating
 
laser optical technique
 
low fd
 
microelectromechanical
 
sample surface
 
simple optical arrangement
 
tiny square indentation
 

Che-Hua Yang