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

The study presents a realized concept of an ultrasonic transducer intended to work in a gaseous medium, which radiates a focused ultrasonic beam in many directions simultaneously. The use of a longitudinal-longitudinal (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 four resonant elements: an ultrasonic sandwich type transducer, vibration amplitude transformer, L-L type converter, and axisymmetrical radiating plates. It is also acceptable to use a longitudinal-longitudinal-longitudinal (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.