Ultrasonic transducers with directional converters of vibration of longitudinal-longitudinal (L-L) type and longitudinal-longitudinal-longitudinal (L-L-L) type intended to work in gaseous media

Abstract

The study presents a realised concept of an ultrasonic transducer intended to work in a gaseous medium, that radiates a focused ultrasonic beam in many directions simultaneously. The use of a L-L type vibration direction converter makes it possible to radiate ultrasonic energy in a required direction without changing the location of the activation source. The transducer consists of 4 resonant elements: an ultrasonic sandwich type transducer, vibration amplitude transformer, L-L type converter and asymmetrical radiating plates. It is also acceptable to use a L-L-L type vibration direction converter. The benefit of such a solution is that it is possible to use one ultrasound source for simultaneous activation of several radiating plates. The study presents conductance and susceptance characteristics of a complex resonance system, amplitude frequency characteristics of the level of acoustic pressure and sample characteristics of the directivity of a transducer with two independent radiating plates. The suggested solution creates new possibilities for applications of this type of resonance systems. © 2013 Acoustical Society of America.