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Materials 2018, 11(5), 755; https://doi.org/10.3390/ma11050755

New Magnetostrictive Transducer Designs for Emerging Application Areas of NDE

Southwest Research Institute, 6220 Culebra Rd, San Antonio, TX 78238, USA
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Received: 4 April 2018 / Revised: 26 April 2018 / Accepted: 3 May 2018 / Published: 8 May 2018
(This article belongs to the Special Issue Magnetostrictive Composite Materials)
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Abstract

Magnetostrictive transduction has been widely utilized in nondestructive evaluation (NDE) applications, specifically for the generation and reception of guided waves for the long-range inspection of components such as pipes, vessels, and small tubes. Transverse-motion guided wave modes (e.g., torsional vibrations in pipes) are the most common choice for long-range inspection applications, because the wave motion is in the plane of the structure surface, and therefore does not couple well to the surrounding material. Magnetostrictive-based sensors for these wave modes using the Wiedemann effect have been available for several years. An alternative configuration of a sensor for generating and receiving these transverse-motion guided waves swaps the biasing and time-varying magnetic field directions. This alternative design is a reversed Wiedemann effect magnetostrictive transducer. These transducers exhibit a number of unique features compared with the more conventional Wiedemann sensor, including: (1) the use of smaller rare earth permanent magnets to achieve large, uniform, and self-sustained bias field strengths; (2) the use of more efficient electric coil arrangements to induce a stronger time-varying magnetic field for a given coil impedance; (3) beneficial non-linear operating characteristics, given the efficiency improvements in both magnetic fields; and (4) the ability to generate unidirectional guided waves when the field arrangement is combined with a magnetically soft ferromagnetic strip (patch). Reversed Wiedemann effect magnetostrictive transducers will be presented that are suitable for different inspection applications, one using electromagnetic generation and reception directly in a ferromagnetic material, and another design that integrates a magnetostrictive patch to improve its efficiency and enable special operating characteristics. View Full-Text
Keywords: magnetostrictive transducers; guided waves testing; reversed Wiedemann effect; nonlinear harmonics magnetostrictive transducers; guided waves testing; reversed Wiedemann effect; nonlinear harmonics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Vinogradov, S.; Cobb, A.; Fisher, J. New Magnetostrictive Transducer Designs for Emerging Application Areas of NDE. Materials 2018, 11, 755.

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