56-MHz-Bandwidth 2.4-3.5 μV/Pascal-Sensitivity-Range Polyvinylidene Fluoride Ultrasound Sensor Array for Biomedical Thermoacoustic Imaging

In this paper the design of broad-band Polyvinylidene Fluoride (PVDF) based piezoelectric ultrasound transducer is presented. A Finite Element Model (FEM) is used to simulate here PVDF ultrasonic transducers. Based on this FEM, the relationship between the Physical structure and properties of PVDF transducer are studied both in simulation and experiment. It shows that the center frequency and many other property parameters of PVDF ultrasonic transducers are strongly related to its physical structures of it. Finally, the simulation result shows the resonant frequency of (54MHz) and sensitivity of (3.6uV/Pa). A prototype multi-channel arrays 0.3mm x 10 mm active area has been fabricated and experimentally validated its preliminary results in terms of electrical and acoustic properties.