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8. Pure, low loss Lamb wave transducer

Author

Yiwei Mao Yiwei Mao, Yin Ni Yin Ni, Yongan Shui Yongan Shui, Mingxi Den Mingxi Den, Youzhi Li Youzhi Li, and Changming Gan Changming Gan

Subjects
Shear waves, Wavelength, Materials science, Lamb waves, Transducer, Interdigital transducer, Acoustics, Excited state, Surface acoustic wave, Insertion loss
Abstract

A new type of pure mode Lamb wave transducer was fabricated. Between LiNbO3 wafer and glass plate, there was an interdigital transducer (IDT) with the periodicity equal to the required Lamb wavelength. The IDT generates both longitudinal and shear waves into glass. The principle is to choose the cut orientation of LiNbO3 in order that the excited bulk waves are similar to the composition of Lamb wave. As a result, most of the excited energy from transducer transfers to the selected mode, and transduction loss becomes very low. By this method we obtained the pure mode Lamb wave transducer with the lowest loss there has ever been. Between two bidirectional transducers, the insertion loss was about 12 dB

Published
1994

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