Schallwandler

A sonic transducer has a monomorphic bending vibrator formed by a combination of a piezoceramic disk and a membrane consisting of a mixture of epoxy and hollow glass spheres or a material with similar sonic properties. The planar oscillation mode in the piezoceramic is transformed, by means of transverse contraction, into a thickness oscillation which is tuned to the propagation medium (especially air) by a coupling layer of low acoustic impedance. USE - Especially as a sonic or ultrasonic transducer for sound transmission or reception through air. ADVANTAGE - The transducer provides more efficient conversion of electromagnetic waves into mechanical waves or vice-versa, has a simple construction, high operational reliability and low manufacturing cost and has increased sensitivity. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the conversion of radial oscillation into thickness oscillation. (2) Piezoceramic; (4) Planar oscillation mode; (6) Transverse contraction.