Abstract
Ultrasonic transducers for nondestructive testing (NDT) require wide bandwidth and high sensitivity to obtain good axial resolution and strong signal reception, which requires active materials with high electromechanical coupling performance. In this work, 2.5 mol% Sm-doped Pb(Mg1/3Nb2/3)O3-30PbTiO3 (PMN-30PT:2.5Sm) piezoelectric ceramics with excellent piezoelectric properties (d33 =1065 pC/N, and k33 = 77 %) were synthesized and a ceramic/epoxy 1–3 composite ultrasonic transducer was fabricated. The center frequency is around 2.3 MHz, the − 6 dB bandwidth reaches 135.9 %, and the insertion loss is −18.7 dB. Compared with the transducer made of PZT-5H composite, the −6 dB bandwidth is increased by 45.3 % and the insertion loss is increased by 2.2 dB. The imaging experiments also show that the PMN-30PT:2.5Sm ceramic transducer has a better axial resolution (at −6 dB).
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