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Proceedings Paper

The measurement of elastic waves in a nonferromagnetic plate by a patch-type magnetostrictive sensor
Author(s): Seung Hyun Cho; Kyung Ho Sun; Ju Seung Lee; Yoon Young Kim
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Paper Abstract

The coupling phenomenon between stress and magnetic induction, known as magnetostriction, has been successfully applied to generate and measure elastic waves. Most applications of this phenomenon thus far, however, are rather limited to cylindrical ferromagnetic waveguides. The main objective of this work is to develop a new patch-type, orientation-adjustable magnetostrictive transducer that is applicable for non-cylindrical, non-ferromagnetic waveguides. The existing patch-type transducer consisting of a ferromagnetic patch and a racetrack coil is useful to generate elastic waves only in one specific direction once the patch is bonded to a test specimen. However, the proposed transducer can transmit and receive elastic waves in any direction only with one patch at a given location. The proposed magnetostrictive transducer consists of a circular nickel patch, a figure-of-eight coil, and a couple of bias permanent magnets. Because of the unique configuration of the transducer, the propagating direction of the generated waves can be freely controlled since the set of bias magnets and the coil is not bonded to the magnetostrictive patch. In this work, the characteristics of the proposed transducer were investigated experimentally

Paper Details

Date Published: 27 July 2004
PDF: 11 pages
Proc. SPIE 5384, Smart Structures and Materials 2004: Smart Sensor Technology and Measurement Systems, (27 July 2004); doi: 10.1117/12.539641
Show Author Affiliations
Seung Hyun Cho, Seoul National Univ. (South Korea)
Kyung Ho Sun, Seoul National Univ. (South Korea)
Ju Seung Lee, Seoul National Univ. (South Korea)
Yoon Young Kim, Seoul National Univ. (South Korea)

Published in SPIE Proceedings Vol. 5384:
Smart Structures and Materials 2004: Smart Sensor Technology and Measurement Systems
Eric Udd; Daniele Inaudi, Editor(s)

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