4387 - INVESTIGATION ON THE EFFECT OF IMPERFECT INTERFACE ON THE PROPERTIES OF LOVE WAVE PROPAGATION
2013
Surface waves can be found many practical applications in MEMS and ultrasonic transducers.
Love wavedevices/sensors are high sensitive devices which can be found much engineering significance in many signal transmission, signal processing and information storage applications. For the
piezoelectricfilm/elastic substrate layered system, in practical applications,
piezoelectricceramics often inherently have a much higher mechanical strength under compressive stresses in order to improve the reliability of transducers. On the other hand, due to the thermal mismatch, intrinsic stress and the brittleness nature of
piezoelectricceramics, there exists unavoidable initial stress in above-mentioned
piezoelectriclayered structures and
imperfectionoccurs between the interfaces of the structures. These
imperfectionsmay influence the propagation behavior of
Love waves. Effects of
imperfectionson the dispersion relations of
Love wavein
piezoelectriclayered structures are taken into account theoretically and experimentally. A new kind of
contact-typeline-focused transducer is developed for the
Love waveto be excited and detected. Experiments concerning the propagation of
Love wavesin
piezoelectriclayered structure are carried out to investigate the
imperfectinterface effect. Results obtained in our research indicate that
imperfectinterface can greatly influence the propagation properties of
Love wavesunder some certain conditions. Experimental results agree well with the theoretical prediction, which also indicate that the novel
Love wavetransducer developed by us is effective.
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