EXTRACTION OF MODEL PARAMETERS OF PIEZOELECTRIC ULTRASOUND TRANSDUCERS BASED ON THE MEASUREMENT OF ELECTRICAL DATA

The subject of the present paper is the mathematical modelling of piez oelectric ultrasound probes and the precise estimation of the required parameters of the model based on the measured electrical behaviour of a real probe. The knowledge of the elastic, piezoelectric and dielect ric parameters of the probe is crucial for the match between the simul ated behaviour of the mathematical model and the measured behaviour of the real probe. The employed deterministic estimation method of the n onlinear optimization based on the one-dimensional frequency domain mo del of the probe is very robust because of the exact calculation of th e first differentiation. In addition to the optimum parameters of the model the estimation method yields a statistical measure for the relia bility of the estimated parameters.