2020 Volume 59 Issue 1 Pages 28-32
Piezo-ceramic transducers are often used to generate ultrasonic waves. In many cases, the transducer is driven in the thickness direction. However, its thickness vibration velocity is not always uniform over the acoustic radiation surface of transducer. This is because the elastic coupling in the longitudinal direction and the lateral vibration are existed even when transducer is driven in the thickness direction. To suppress the lateral component of vibration, “siding” method to load the side of the transducer is newly proposed. In order to verify the effect of siding, vibration velocity of the surface of disk-type transducer is measured. Furthermore, the sound field in the water is observed by the Schlieren method to show that there is no unnecessary radiation, and the advantages of siding are clarified.
