Experimental Analysis of 1-3 Piezocomposites for High-Intensity Focused Ultrasound Transducer Applications
Experimental Analysis of 1-3 Piezocomposites for High-Intensity Focused Ultrasound Transducer Applications
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DOI：
10.1109/tbme.2012.2226881
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发表时间：
2013-01-01
影响因子：
4.6
通讯作者：
Lin, Yu-Li
中科院分区：
文献类型：
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作者：
Chen, Gin-Shin;Liu, Hsin-Chih;Lin, Yu-Li
具有 1-3 连接性的压电复合材料已广泛用于医学成像换能器和高强度聚焦超声换能器，但大多数 1-3 压电复合材料的研究都针对医学成像应用。本研究的目的是通过一系列实验分析，全面研究专门用于高功率超声波换能器应用的 1-3 种复合材料。内部构建了具有各种纵横比和体积分数的 PZT4-环氧树脂复合材料聚焦换能器，用于评估耦合因数、介电损耗角正切、品质因数、带宽、声阻抗和电声效率。实验分析表明，虽然复合材料换能器的耦合系数高于陶瓷换能器，但由于复合材料的介电损耗和机械能损失较高，复合材料换能器的效率较低。此外，复合换能器的带宽和声阻抗均优于陶瓷换能器。对于复合换能器，效率和声阻抗与纵横比成反比，与体积分数成线性正比。彼此距离太近的柱间耦合可能会导致复合换能器的效率显着降低。通过适当的长宽比、体积分数和PZT柱间距的设计，可以获得高效的复合高强度聚焦超声换能器。
Piezocomposites with 1-3 connectivity have been extensively used in medical imaging transducers and high-intensity focused ultrasound transducers, but most studies of 1-3 piezocomposites address medical imaging applications. The purpose of this study was to completely investigate 1-3 composites specifically for high-power ultrasonic transducer applications via a series of experimental analyses. PZT4-epoxy composite focused transducers with various aspect ratios and volume fractions were constructed in-house for the evaluation of the coupling factor, dielectric loss tangent, quality factor, bandwidth, acoustic impedance, and electroacoustic efficiency. The experimental analyses demonstrated that although the coupling factor of composite transducers was higher than that of the ceramic transducer, the composite transducers had a lower efficiency due to the high dielectric loss and high mechanical energy loss of the composites. In addition, the bandwidth and acoustic impedance of composite transducers were superior to the ceramic transducer. For the composite transducers, the efficiency and acoustic impedance were inversely proportional to the aspect ratio and linearly proportional to the volume fraction. The coupling of inter pillars that are too close to each other could cause a significant decrease in the efficiency of the composite transducer. With an appropriate design in terms of the aspect ratio, volume fraction, and PZT-pillar spacing, a high-efficiency composite high-intensity focused ultrasound transducer can be achieved.