Examination of a Langevin-Type Transducer Using a LiNbO_3 Single Crystal

概要

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We are aiming at developing a Langevin longitudinal transducer without a bolt using a single crystal. The Z plate of the LiNbO_3 single crystal was used as a piezoelectric material. We selected epoxy resin for bonding a piezoelectric disc (10mmφ) and stainless blocks (12.5mm in length) as trial samples. The resonant frequency is about 94kHz and the Q factor is about 1000. The material constants of the adhesive were derived for the finite element method (FEM) analysis. We measured the marked decrease in the Q factor due to temperature rise. It became clear that the measurement for high-voltage operation by continuous wave was limited within 4cm/s of the edge surface velocity. We drove transducers using a burst signal and suppressed the temperature rise of the transducer. This method extended the measurement limitation to 40cm/s. To clarify the problems of this transducer, the relationship between the bonding layer and the resonance resistance, and the stress in the bonding layer were determined using FEM. A thin crystal disc was also found to decrease the resonance resistance using FEM. [DOI: 10.1143/JJAP.41.3426]
社団法人応用物理学会の論文
2002-05-30