Adhesive free PVDF copolymer focused transducers for high frequency acoustic imaging

Abstract

The present study has demonstrated to produce a reliable PVDF copolymer focused transducers from a layer-by-layer deposition method by engraving milled spherical cavies in a PEI polymer substrate. The proposed method which process P(VDF-TrFE) from the fluid phase, is adhesive-free in the sense that it does not require any additional adhesive layers for material binding. The transducer was acoustically characterized by pulse/echo ultrasonic measurements. The transducer center frequency was estimated to 48.5 MHz with 94.2% bandwidth. The two-dimensional scanning showed very detailed surface variations with the expected resolution.