Design of interdigital transducers for crack detection in plates

    Authors

    J. Jin; S. T. Quek;Q. Wang

    Comments

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    Abbreviated Journal Title

    Ultrasonics

    Keywords

    interdigital transducer; lamb wave; NDE strategy; mobile double-sided; crack geometry; LAMB WAVES; Acoustics; Radiology, Nuclear Medicine & Medical Imaging

    Abstract

    Interdigital transducers (IDT) for non-destructive evaluation (NDE) of cracks in plates are designed based on an analytical model established previously. Key considerations include mode selectivity, excitation strength, collimation of wave and cost. The advantage of mode selectivity of IDT over PZT patch is presented both analytically and experimentally. Effects of parameters, namely finger spacing, width, length, number of fingers, and the size of IDT, on the excitation strength and mode selectivity are considered. This led to the design of a mobile double-sided IDT as an efficient device where excitation strength is strong and focused. The device was fabricated in-house using commercially available piezoelectric ceramics and used to develop a procedure for accurate identification of the direction and extent of cracks in plates. Three aluminum plates, one with a linear deep crack, another with a piecewise linear shallower crack and the third with a curved crack, were used to illustrate the accuracy and efficiency of both the proposed device and procedure for effective NDE. (c) 2004 Elsevier B.V. All rights reserved.

    Journal Title

    Ultrasonics

    Volume

    43

    Issue/Number

    6

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    481

    Last Page

    493

    WOS Identifier

    WOS:000229046100009

    ISSN

    0041-624X

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