Piezoelectric PVF2 Polymer Films and Devices

摘要

Acoustic transducers and imaging arrays using PVF2 piezoelectric film as the active element have been extensively explored. Thin disk PVF2 bulk wave transducers were experimentally developed and studied using a computer model. Aspects of transducer behavior studied include bandwidth, impulse response, insertion loss, internal loss, impedance matching, and angular response. A monolithic multielement PVF2 transducer array is described which uses photolithographic techniques to achieve a reproducible, inexpensive and highly accurate integrated device for ultrasonic imaging applications. This array was used to produce an electronically focused and scanned acoustic beam. Two-dimensional acoustic images of small test objects were performed, to investigate the beam shape and imaging characteristics, which were found to be consistent with theoretical predictions. At a frequency of 2.25 MHz and an f/number of 5, a resolution in the range of 3 mm was observed. (Author)