Development of a segmented annular array transducer for acoustic imaging

A 1.6 MHz segmented annular array transducer of 64 elements made from a piezoelectric composite as a monolithic support has been manufactured and characterised. Input electrical impedance and pulse response of each array element was in good agreement with the results calculated by using the KLM model. Cross-coupling between nearest neighbours was -45 dB at the resonance frequency assuring the good array performance in terms of cross-coupling and elements isolation. Vibration surface measurement of a sector of elements excited simultaneously was made. The transducer was designed for the inspection of solid materials in non-destructive testing (NDT). (C) 2002 Elsevier Science Ltd. All rights reserved.