Shiroh Saitoh, Tsuyoshi Kobayashi, Kouichi Harada, Senji Shimanuki, and Yohachi Yamashita
ABSTRACT A 0.91Pb(Zn1/3Nb2/3)O3-0.09PbTiO3 (PZN-PT) single crystal with high electromechanical coupling factor (k33)>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.
1999 IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control Vol. 46, pp. 152-157, 1999
© 1999, by The Institute of Electrical and Electronics Engineers, Inc. All rights reserved.