An Electromechanical Representation of a Piezoelectric Crystal Used as a Transducer*
W. P. Mason · Bell System Technical Journal · 1935
The equivalent electrical representation of a piezoelectric crystal when used as an element in an electrical circuit has been discussed by several investigators.1who have arrived at the circuit shown on Fig. 1. Apparently, however, no circuit has been evolved for representing a crystal when it is used as a transducer to couple electrical circuits to mechanical systems. Since such crystals 2 are used in loud speakers, microphones, supersonic radiators, and other apparatus, it is a matter of importance to obtain such a representation. This paper discusses such an equivalent circuit and relates the elements to the mechanical, electrical, and piezoelectric constants of the material. When used as a purely electrical circuit, this representation reduces to that of Fig. 1.