Abstract
Samarium- (Sm) and manganese- (Mn) doped lead titanate ceramic fibers with a diameter of 35 microm were prepared using a sol-gel method. The X-ray diffraction pattern shows that the fibers have a pure perovskite structure. The 1-3 composite disks with a thickness of 31-41 microm and with ceramic volume fraction of approximately 0.68 have been prepared using the samarium and manganese doped lead titanate (PSmT) fibers. The resonance characteristics of the poled composite disks were measured. A focused transducer was fabricated using a concave 1-3 composite disk with nonuniform thickness in order to enhance its bandwidth. The insertion loss (IL), pulse-echo response and frequency spectrum of the composite transducer were measured. The center frequency of the transducer was approximately 31 MHz with a -3 dB bandwidth of approximately 123% and a low IL of 29.3 dB.
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