采用0.91Pb(Zn(1/3 )Nb(2/3))O(3)-0.09PbTiO(3) 单晶的40通道相控阵超声探头。
Forty-channel phased array ultrasonic probe using 0.91Pb(Zn(1/3 )Nb(2/3))O(3)-0.09PbTiO(3) single crystal.
作者信息
Saitoh S, Kobayashi T, Harada K, Shimanuki S, Yamashita Y
机构信息
Research and Development Center, Toshiba Corp., Kawasaki 210-8582, Japan.
出版信息
IEEE Trans Ultrason Ferroelectr Freq Control. 1999;46(1):152-7. doi: 10.1109/58.741526.
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 6.0x7.5 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.
一种机电耦合系数（k(33)）大于90%的0.91Pb(Zn(1/3)Nb(2/3))O(3)-0.09PbTiO (3)（PZN-PT）单晶已被用于制造一种40通道相控阵超声探头，该探头比传统探头具有更高的灵敏度和更宽的带宽。该探头的中心频率为3.5 MHz，孔径约为6.0×7.5 mm。针对PZN-PT对标准探头制造工艺进行了改进。回波信号的离散度在平均值的±20%以内。恢复极化后，PZN-PT单晶探头的回波幅度分别比单匹配层和双匹配层PZT探头高8 dB和5 dB。此外，单匹配层PZN-PT探头的分数带宽比双匹配层PZT探头更宽。PZN-PT单晶在相控阵探头的灵敏度和带宽方面有很大提高。
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