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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Piezoceramics for high-frequency (20 to 100 MHz) single-element imaging transducers
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Piezoceramics for high-frequency (20 to 100 MHz) single-element imaging transducers

机译：高频（20至100 MHz）单元素成像换能器的压电陶瓷

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摘要

The performance of transducers operating at high frequencies is greatly influenced by the properties of the piezoelectric materials used in their fabrication. Selection of an appropriate material for a transducer is based on many factors, including material properties, transducer area, and operating frequency. The properties of a number of piezoceramic materials have been experimentally determined by measuring the electrical impedance of air-loaded resonators whose thickness corresponds to resonance frequencies from 10 to 100 MHz. Materials measured include commercially available compositions of lead zirconate titanate (PZT) with relatively high dielectric constants and a modified lead titanate (PT) composition with a much lower dielectric constant. In addition, materials which have been designed or modified to result in improved properties at high frequencies are studied. Conclusions concerning the influence of the microstructure and composition on the frequency dependence of the material properties are made from the calculated properties and microstructural analysis of each material. Issues which affect transducer performance are discussed in relation to the properties. For transducers larger than about 1 mm in diameter, the use of a lower dielectric constant material is shown to result in a better electrical match between the transducer and a standard 50 /spl Omega/ termination. For transducers whose impedance is close to that of the connecting cables and electrical termination, equivalent circuit model simulations show improved performance without the need for electrical matching networks. Measurements of fabricated transducers show close agreement with the simulations, validating the measurements and showing the performance benefits of electrically matched transducers.
机译：在高频下工作的换能器的性能在其制造过程中受到压电材料性能的很大影响。为换能器选择合适的材料是基于许多因素，包括材料属性，换能器面积和工作频率。许多压电陶瓷材料的特性已通过测量空载谐振器的电阻抗来实验确定，该谐振器的厚度对应于10至100 MHz的谐振频率。所测量的材料包括具有相对高介电常数的市售锆钛酸铅（PZT）组成和具有低得多介电常数的改性钛酸铅（PT）组成。此外，还研究了经过设计或修改以提高高频性能的材料。从每种材料的计算性能和微观结构分析得出有关微观结构和成分对材料性能的频率依赖性的影响的结论。讨论与性能有关的影响换能器性能的问题。对于直径大于约1毫米的换能器，显示使用较低介电常数的材料可导致换能器与标准50 / spl Omega /终端之间更好的电匹配。对于阻抗接近连接电缆和电气终端阻抗的换能器，等效电路模型仿真显示出性能得到改善，而无需电气匹配网络。预制换能器的测量结果与仿真结果非常吻合，验证了测量结果并显示了电匹配换能器的性能优势。

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