2F-6 Properties and Application-Oriented Performance of High Frequency Piezocomposite Ultrasonic Transducers
2F-6 Properties and Application-Oriented Performance of High Frequency Piezocomposite Ultrasonic Transducers
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2F-6 高频压电复合材料超声波换能器的特性和面向应用的性能
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
S. Cochran
中科院分区：
文献类型：
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作者：
D. MacLennan;J. Elgoyhen;T. Button;C. Démoré;H. Hughes;C. Meggs;S. Cochran
常规的高频压电复合材料制造现已成为可能。然而，专门的表征技术和参考结果是从文献中缺席，有一个迫切的需求，表征，以支持使用这种材料在传感器的生物医学诊断和非破坏性评估。在本文中，我们报告了一种新的程序，高频压电复合材料的制造和结果的密集表征的基础上电阻抗谱和其他技术。1-3使用能够规模化商业生产的工艺，已经制造了具有圆形PZT柱的复合结构，所述圆形PZT柱的直径和切口分别低至12 μ m和6 μ m，纵横比> 3，体积分数约为40%，有效面积约为4 mm。实验电阻抗测量已被证明是密切匹配的一维模型和压电复合材料的性能大大超过其他材料，如PVDF和铌酸锂。对实际性能进行了全面表征，包括通过传输和脉冲回波测量，生成单点结果和高分辨率1D和2D扫描，以生成2D和3D数据集，包括钨丝测试对象，以确定轴向和横向分辨率以及传感器灵敏度。这里描述了一个典型的原型聚焦换能器，f数为4，中心频率为37 MHz。性能调查产生了通过传输-3 dB带宽为24 MHz，脉冲回波-6 dB带宽为22 MHz，横向和轴向分辨率分别为250妈妈和150妈妈。
Routine high frequency piezocomposite fabrication is now becoming possible. However, specialized characterisation techniques and reference results are absent from the literature and there is an urgent demand for characterisation to support the use of this material in transducers for biomedical diagnosis and non-destructive evaluation. In this paper, we report on a novel procedure for high frequency piezocomposite fabrication and results of intensive characterisation based on electrical impedance spectroscopy and other techniques. 1-3 composite structures have been made with circular PZT pillars with diameter and kerf down to 12 mum and 6 mum respectively, aspect ratio > 3, volume fractions around 40% and active area of around 4 mm using a process which is capable of scalable commercial production. Experimental electrical impedance measurements have proved to be closely matched to one-dimensional models and piezocomposite material performance greatly exceeds that of other materials such as PVDF and LiNbO3. Comprehensive characterization of practical performance has been carried out including both through-transmission and pulse-echo measurements, generating single point results and high resolution 1D and 2D scans to produce 2D and 3D data sets, including tungsten wires test objects to determine axial and lateral resolution and transducer sensitivity. A typical prototype focused transducer is described here, with f- number of 4 and centre frequency of 37 MHz. Performance investigation yielded a through-transmission -3 dB bandwidth of 24 MHz, pulse-echo -6 dB bandwidth of 22 MHz, and lateral and axial resolutions of 250 mum and 150 mum respectively.