A Novel Pressure Transducer Using Mechanical Resonance

A novel electromechanical pressure transducer, suitable for telemetering, is proposed. It transforms an absolute static pressure into a frequency signal, using acoustical resonance due to the stiffness of a fluid in a cavity and the mass of a vibrating plate. The relation between the period of the output frequency T and the normalized input pressure p is theoretically given by T² = A + B/p, where A and B are constants. This relation is verified experimentally by constructing two kinds of models. The advantages and disadvantages of the transducer are discussed.