Design and fabrication of cylindrical transducer based on 2–2 piezoelectric composite

Abstract

A cylindrical transducer based on PZT-5H/epoxy 2-2 piezoelectric composite with 40 elements is designed and fabricated in this paper. The prepared PZT-5H/epoxy 2-2 piezoelectric composite shows a single thickness mode, low acoustical impedance (25.8MRayls) and high electromechanical coupling coefficient (0.72). A pulse-echo method is utilized to test the performance of the cylindrical transducer. The center frequency for a representative element is calculated to be 5.02MHz and -6dB bandwidth is 62.9%. The elevation focal length is approximately 4.9cm. It indicates the bend-and-combine method proposed is feasible.