论文和技术资料

The technology involved in high performance ultrasound imaging probes needs a reliable model to help in new projects development and performance simulations. To achieve a useful model, it is necessary to use correct values for all material parameters involved in the electro-acoustical performances of the piezoelectric material, but unfortunately some of these parameters are known only with high uncertainty and others are not always present in the manufacturer specifications. The present work consists in the development of a simple Finite Elements Model (FEM) for a piezoelectric disk transducer, along with a reliable optimization procedure to determine all parameters for the materials involved in the transducer functioning. The results presented here show that the optimized model can be used to predict measurements results in term of electrical impedance magnitude, frequency response and directivity of emission of the transducer with a high accuracy. Some other intermediate results are briefly discussed like radial resonance modes.