MEASUREMENT AND CALCULATION OF THE ELECTROMECHANICAL PARAMETERS OF THE PIEZOCERAMIC THIN CYLINDRICAL TUBE TRANSDUCERS

On the basis of the electrical admittance equation for the unloaded tan-gentially and radially polarized piezoceramic thin circular cylindrical tube, the method and formulars, also the program for calculating the electromechanical parameters from the measured data are presented. If the size, density, capacitance at low frequency, frequences at maximum and minimum admittances, and several other admittances with their corresponding frequencies are known from the measurement, then the Young’s modulus, Pois-son’s ratio, electromechanical coupling coefficients, permitivity, and piezoelectric constants can be calculated with the formulars given here. Practical measurements and calculations for several samples have been carried out with this method.