The characteristic analysis of gradient matching layer of wideband ultrasonic transducer -Comparison of different matching layers

On the basis of discussing the feasibility of gradient matching layer design, the simulation of single matching layer, double matching layer and triple matching layer is carried out by PiezoCAD software. The simulation results indicate that the energy utilization efficiency of ultrasonic transducers will increase with the increase of acoustic matching layers and the -6dB bandwidth. Based don simulation, the gradient acoustic matching layer is prepared, and the experiment results prove that the ultrasonic transducer prepared contains gradient acoustic matching layer has a wider bandwidth. The feasibility of the ultrasonic transducer with gradient impedance and the influence of the matched layer material on the acoustic attenuation coefficient is also discussed.