Development of lead-free single-element ultrahigh frequency (170-320MHz) ultrasonic transducers.
Development of lead-free single-element ultrahigh frequency (170-320MHz) ultrasonic transducers.
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DOI：
10.1016/j.ultras.2013.01.012
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发表时间：
2013-07
期刊：
影响因子：
4.2
通讯作者：
Shung, K. Kirk
中科院分区：
文献类型：
--
作者：
Lam, Kwok Ho;Ji, Hong Fen;Zheng, Fan;Ren, Wei;Zhou, Qifa;Shung, K. Kirk
本文介绍了中心频率为170 ~ 320 MHz的单元件超高频超声换能器的设计、制作和特性。中心频率> 300 MHz，是迄今为止报道的无铅陶瓷超声换能器的最高值。考虑到铅基材料对环境的污染，本文提出了无铅K0.5Na0.5NbO3/Bi0.5Na0.5TiO3（KNN/BNT）复合厚膜换能器元件。所有探头均在脉冲回波排列中进行评价。测得的换能器−6 dB带宽范围为35%至64%。通过优化复合膜的压电性能，测量了UHF换能器的插入损耗，并确定其范围为−50至−60 dB。除了脉冲回波测量外，还使用205 MHz换能器对6 μm钨丝体模进行成像，以证明成像能力。测得的−6 dB轴向和横向分辨率分别为12 μm和50 μm。在这项工作中提出的传感器的性能被证明是更好的或以前报道的结果，即使频率高得多。
This paper presents the design, fabrication and characterization of single-element ultrahigh frequency (UHF) ultrasonic transducers in which the center frequency ranged from 170 to 320 MHz. The center frequency of > 300 MHz is the highest value of lead-free ceramic ultrasonic transducers ever reported. With concern in the environmental pollution of lead-based materials, the transducer elements presented in this work were lead-free K0.5Na0.5NbO3/Bi0.5Na0.5TiO3 (KNN/BNT) composite thick films. All transducers were evaluated in a pulse-echo arrangement. The measured −6 dB bandwidth of the transducers ranged from 35 to 64 %. With the optimized piezoelectric properties of the composite film, the insertion loss of the UHF transducers was measured and determined to range from −50 to −60 dB. In addition to the pulse-echo measurement, a 6-μm tungsten wire phantom was also imaged with a 205 MHz transducer to demonstrate the imaging capability. The measured −6 dB axial and lateral resolutions were found to be 12 μm and 50 μm, respectively. The transducer performance presented in this work is shown to be better or comparable to previously reported results even though the frequency is much higher.
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