Magnetostrictive Sensor for Generating and Detecting Plate Guided Waves

[+] Author and Article Information
Hegeon Kwun, Sang Young Kim

 Southwest Research Institute, 6220 Culebra Road, San Antonio, Texas 78238-5166

J. Pressure Vessel Technol 127(3), 284-289 (Mar 07, 2005) (6 pages) doi:10.1115/1.1991874 History: Received February 24, 2005; Revised March 07, 2005

The development of a magnetostrictive sensor for generating and detecting guided waves in ferromagnetic plate is described. The sensor consists of a channel-shaped core and coils wound around the core along its length. It is shown that the sensor is capable of generating and detecting both the symmetric and antisymmetric Lamb wave modes and the shear horizontal wave modes in plates. It is also found that the beam pattern produced by the sensor follows the pattern expected for a line source in a two-dimensional medium.

Copyright © 2005 by American Society of Mechanical Engineers
Topics: Sensors , Waves , Probes , Signals
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Figure 1

General configuration of MsS design for guided wave generation and detection in plates

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Figure 2

Sensor arrangements on plate sample: (a) For investigation of wave modes generated and detected and (b) for investigation of beam patterns

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Figure 3

Lamb wave mode data: (a) Detected signals and (b) a time-frequency representation of the detected signals

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Figure 4

Calculated dispersion curves for Lamb and shear horizontal (SH) wave modes in 6.35 mm thick steel plate

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Figure 5

Shear horizontal (SH) mode data: (a) Detected signals and (b) a time-frequency representation of the detected signals

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Figure 6

Beam pattern data for a 100 kHz SH0 wave generated by a 116 mm long MsS probe: (a) Along the central axis, z, of the probe and (b), (c), and (d) across the sample width at different z values. Circles are experimental data, and the lines are calculated based on the diffraction theory.




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