11 April 2007 Ultrasonic magnetostrictive transducers for guided ultrasonic waves in thin wires
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The magnetostrictive effect is used to generate ultrasonic waves for a variety of health monitoring applications. Given the ductile nature of many ferromagnetic materials and the common geometrical configuration of magnetic inductance coils, magnetostrictive generation of ultrasound is especially suitable for long cylindrical waveguides such as thin wires. Furthermore, utilizing ultrasonic guided wave modes in such waveguides provides a robust tool for remote inspection of materials or environments over long distances. Through the use of different guided wave modes, structural health monitoring sensors could be tailored to suit individual applications. Guided wave modes offer a choice in displacement profile allowing sensors to be designed to be either sensitive or impervious to surface effects. The dispersivity of the guided wave velocity can also be optimized for applications involving time-of-flight measurements. Despite the advantages afforded by guided wave analysis, current magnetostrictive transducers, consisting of coil of wire and a bias magnet, can not perform at the frequencies necessary to excite higher order guided wave modes. In order to advance the capability of magnetostrictive transducers for ultrasonic guided waves in wires, the design parameters of inductance coils are examined. Using a Laser Doppler Vibrometer, ultrasonic displacements are measured over a range of excitation frequencies for different coil configurations and parameters to determine the feasibility of developing a higher mode magnetostrictive transducer.
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Matthew M. Kropf, Matthew M. Kropf, B. R. Tittmann, B. R. Tittmann, } "Ultrasonic magnetostrictive transducers for guided ultrasonic waves in thin wires", Proc. SPIE 6532, Health Monitoring of Structural and Biological Systems 2007, 65320L (11 April 2007); doi: 10.1117/12.715815; https://doi.org/10.1117/12.715815

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