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Excitation of higher order modes in Lamb wave delay lines

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2 Author(s)
Y. Jin ; Dept. of Electr. & Comput. Eng., Marquette Univ., Milwaukee, WI, USA ; S. G. Joshi

The excitation of higher-order ultrasonic Lamb wave modes by an interdigital transducer deposited on a piezoelectric plate is investigated both theoretically and experimentally. It is found that depending on the value of the ratio h/λ (h=plate thickness, λ=acoustic wavelength), a number of higher-order modes can be efficiently excited. The phase velocity of higher-order modes is greater than the surface acoustic wave (SAW) velocity, while their group velocity is lower than that of the SAW. Thus, these modes have a higher resonant frequency and also a longer time delay than the surface acoustic wave. It is found that in acoustically thin plates (h/λ<1) the interdigital transducer (IDT) can efficiently couple to higher-order Lamb waves modes having resonant frequencies greater than ten times the fundamental SAW resonant frequency

Published in:

Ultrasonics Symposium, 1992. Proceedings., IEEE 1992

Date of Conference:

20-23 Oct 1992