多周波数用複合ランジュバン型超音波トランスジュサの特性解析と実験的検討

抄録

Recently, bolt-clamped composite Langevin-type ultrasonic transducers have been developed and manufactured for ultrasonic fish finders as well as ultrasonic cleaners. They are composite vibrators with several piezoelectric elements and metal elements stacked alternatively at proper positions in one arm of the Langevin-type transducers, so that they can generate the ultrasonic power more efficiently compared with conventional Langevin transducers which are operated at their higher harmonic modes.
In this paper, the frequency characteristics of the composite Langevin-type ultrasonic transducers for radiating the ultrasonic power in water are investigated using the transmission line model. The admittance characteristics, the electromechanical coupling factors, and the electroacoustic efficiencies of the transducers are analyzed theoretically and experimentally. Results obtained with a bolt-clamped composite Langevin-type ultrasonic transducer are coincident well with the theoretical results.