Title: Laser ultrasonic analysis of normal modes generated by a voltage pulse on an AT quartz sensor
Authors: Goossens, Jozefien ×
Martinez, Loic
Glorieux, Christ
Wilkie-Chancellier, Nicolas
Ehssein, Chighali Ould
Serfaty, Stephane #
Issue Date: 2006
Publisher: Butterworth Heinemann
Series Title: Ultrasonics vol:44 issue:1 pages:e1179-e1182
Conference: Proceedings of Word Congress on Ultrasonics (WCU) 2005 location:Bejing, China date:28 August – 1 September 2005
Abstract: Laser ultrasonic detection is a versatile and highly sensitive tool for the observation of surface waves. In the following study, laser ultrasonic detection is used for the experimental study of spurious normal vibration modes of a disk quartz sensor excited by a voltage pulse. The AT cut crystal (cut of the crystal relative to the the main crystallographic axis is 35.25) is optimal for generating mainly thickness–shear vibrations (central frequency 6 MHz) on the quartz surface. However, resulting from shear-to-longitudinal and shear-to-surface mode conversion, and from the weak coupling with the other crystallographic axes, other modes (thickness-compressional and bending modes) are always present in the plate response. Since the laser vibrometer is sensitive to normal displacements, the laser investigation shows waves that can be considered as unwanted for the AT quartz used as a shear sensor. The scanned three dimensional (3D) amplitude–space–time signals are carefully analysed using their representation in three dual Fourier domains (space–time, wave number–frequency). Results on the transient analysis of the waves, the normal bending modes and the dispersion curves are shown.
ISSN: 0041-624X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
Physics and Astronomy - miscellaneous
× corresponding author
# (joint) last author

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