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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-elementimaging transducers
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Piezoceramics for high-frequency (20 to 100 MHz) single-elementimaging 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 isngreatly influenced by the properties of the piezoelectric materials usednin their fabrication. Selection of an appropriate material for antransducer is based on many factors, including material properties,ntransducer area, and operating frequency. The properties of a number ofnpiezoceramic materials have been experimentally determined by measuringnthe electrical impedance of air-loaded resonators whose thicknessncorresponds to resonance frequencies from 10 to 100 MHz. Materialsnmeasured include commercially available compositions of lead zirconatentitanate (PZT) with relatively high dielectric constants and a modifiednlead titanate (PT) composition with a much lower dielectric constant. Innaddition, materials which have been designed or modified to result innimproved properties at high frequencies are studied. Conclusionsnconcerning the influence of the microstructure and composition on thenfrequency dependence of the material properties are made from thencalculated properties and microstructural analysis of each material.nIssues which affect transducer performance are discussed in relation tonthe properties. For transducers larger than about 1 mm in diameter, thenuse of a lower dielectric constant material is shown to result in anbetter electrical match between the transducer and a standard 50 Ωntermination. For transducers whose impedance is close to that of thenconnecting cables and electrical termination, equivalent circuit modelnsimulations show improved performance without the need for electricalnmatching networks. Measurements of fabricated transducers show closenagreement with the simulations, validating the measurements and showingnthe 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特性的极大影响。为换能器选择合适的材料是基于许多因素，包括材料特性，换能器面积和工作频率。已经通过测量其厚度n对应于10至100 MHz谐振频率的空载谐振器的电阻抗，通过实验确定了多种压电陶瓷材料的特性。所测量的材料包括具有相对高的介电常数的市售的锆钛酸铅（PZT）组合物和具有低得多的介电常数的改性钛酸铅（PT）组合物。此外，还研究了经过设计或修改以提高高频性能的材料。结论通过对每种材料的计算性能和微观结构分析，得出了微观结构和成分对材料性能随频率的影响。讨论了影响换能器性能的问题。对于直径大于约1 mm的换能器，显示使用较低介电常数的材料会导致换能器与标准50Ω端接之间更好的电匹配。对于阻抗接近于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改进的性能，而无需电气匹配网络。预制换能器的测量结果与仿真结果吻合，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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