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1 May 1998Phased array ultrasonic probe using Pb(Zn1/3Nb2/3)O3-PbTiO3 single crystal
Forty-channel phased array probes using a O.9lPb(Zn113Nb213)03-O.O9PbTiO3 (PZN-PT 91/9) single crystal have been fabricated for greater sensitivity and broader bandwidth properties. The largest crystal by the self-flux method had the dimensions of about 43 X 42 X 40 mm. The fabricated probes have a center frequency of 3.5MHz and an aperture of about 8.5 X 8.5 mm. All transducer elements were successfully cut by mean value the fabrication process, and the dispersion of echo signals was within 20% of the average. Echo amplitudes of these PZN-PT 9 1/9 single-crystal probes are as much as 5 to 8 dB higher than those of conventional PZT ceramic probes. Moreover, the bandwidth ofthe PZN-PT 91/9 probes is 20 to 25 points broader than that of conventional PZT ceramic probes. This confirms that PZN-PT 91/9 single-crystal probe provides great improvements in the sensitivity and bandwidth of phased array probes.