Forty-Channel Phased Array Ultrasonic Probe Using 0.91Pb(Zn_(1/3)Nb_(2/3))O_3-0.09PbTiO_3 single Crystal

摘要

A 0.91Pb(Zn_(1/3)Nb_(2/3))O_3-0.09PbTiO_3(PZN-PT) single crystal with high electromechanical coupling factor (k_(33))>90 has been used to fabricate a 40-channel phased array ultrasonic probe with greater sensitivity and broader bandwidth than conventional probes. This probe has a center frequency of 3.5 MHz and an aperture of about 6.0 * 7.5 mm. The standard probe fabrication process was modified for PZN-PT. The dispersion of echo signals was within +-20 of the mean value. After recovery poling, the echo amplitude of the PZN-PT single-crystal probe is 8 and 5 dB higher than that of one- and two-matching-layer PZT probes, respectively. Moreover, the fractional bandwidth of the single-matching-layer PZN-PT probe is broader than that of the two-matching-layer PZT probes. The PZN-PT single crystals provide great improvements in the sensitivity and bandwidth of phased array probes.