Mode-selectable ultrasonic transducer for cylindrical ferromagnetic waveguides

Youngkyu Kim; Hocheol Lee; Seung Hyun Cho; Yoon Young Kim

doi:10.1117/12.484232

22 July 2003 Mode-selectable ultrasonic transducer for cylindrical ferromagnetic waveguides

Youngkyu Kim, Hocheol Lee, Seung Hyun Cho, Yoon Young Kim

Proceedings Volume 5050, Smart Structures and Materials 2003: Smart Sensor Technology and Measurement Systems; (2003) https://doi.org/10.1117/12.484232
Event: Smart Structures and Materials, 2003, San Diego, California, United States

Abstract

Ultrasonic inspection techniques using magnetostrictive transducers have received much attention in recent years as non-contact, non-destructive means of inspecting ferromagnetic materials. By the selection of a desired mode and thus the rejection of the unwanted modes among propagating waves in a waveguide, different types of flaws existing in a cylindrical ferromagnetic waveguide can be effectively detected. However, desired mode selection methods have not been fully developed yet. The purpose of this research is to present a mangetostrictive sensor based technique for the selection of either the bending or longitudinal waves alone in a ferromagnetic waveguide. To achieve this goal, new bias magnet configurations, particularly for bending mode selection are suggested. Several experimental results are conducted to verify the effectiveness of the suggested magnetostrictive sensors.

Citation Download Citation

Youngkyu Kim, Hocheol Lee, Seung Hyun Cho, and Yoon Young Kim "Mode-selectable ultrasonic transducer for cylindrical ferromagnetic waveguides", Proc. SPIE 5050, Smart Structures and Materials 2003: Smart Sensor Technology and Measurement Systems, (22 July 2003); https://doi.org/10.1117/12.484232

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KEYWORDS

Ferromagnetics

Waveguides

Transducers

Ultrasonics

Inspection

Sensors

Nondestructive evaluation

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