Efficient reflectors for ultrasonic Lamb waves

Shrinivas G. Joshi; Boris D. Zaitsev; Iren E. Kuznetsova

doi:10.1117/12.420862

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21 March 2001 Efficient reflectors for ultrasonic Lamb waves

Shrinivas G. Joshi; Boris D. Zaitsev; Iren E. Kuznetsova

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Proceedings Volume 4235, Smart Structures and Devices; (2001) https://doi.org/10.1117/12.420862
Event: Smart Materials and MEMS, 2000, Melbourne, Australia

Abstract

The reflection of ultrasonic Lamb waves produced by a periodic array of thin conducting or mass loading strips is investigated both theoretically as well as experimentally. A repetitively mismatched transmission line model is used to analyze the performance of the reflector. It is found that Lamb waves propagating in thin elastic plates can be reflected much more efficiently than surface acoustic waves (SAWs). Efficient reflectors can therefore be realized with relatively few strips in the array. The characteristics of a number of reflectors fabricated on thin plates of lithium niobate have been evaluated and found to be in good agreement with theory. The reflectors have been used to realize various useful devices such as unidirectional transducers, low loss, wide bandwidth delay lines, and Lamb wave resonators.

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Shrinivas G. Joshi, Boris D. Zaitsev, and Iren E. Kuznetsova "Efficient reflectors for ultrasonic Lamb waves", Proc. SPIE 4235, Smart Structures and Devices, (21 March 2001); https://doi.org/10.1117/12.420862

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