Design, fabrication, and evaluation of high frequency, single-element transducers incorporating different materials
Design, fabrication, and evaluation of high frequency, single-element transducers incorporating different materials
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DOI：
10.1109/58.985701
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发表时间：
2002-02-01
影响因子：
3.6
通讯作者：
Shung, KK
中科院分区：
文献类型：
--
作者：
Snook, KA;Zhao, JZ;Shung, KK
高频单元件换能器的性能在很大程度上取决于所使用的压电材料的机械和电学性能。本研究比较了采用不同材料的换能器的设计和性能。所研究的材料包括1-3钛酸铅(PZT)纤维复合材料、钛酸铅(PbTiO_3)陶瓷、聚偏氟乙烯(PVDF)薄膜和铌酸锂(LiNbO_3)单晶。所有换能器的孔径大小为3 mm，f数在2到3之间。根据设计目标和制造限制选择支持和匹配材料。采用一种简化的同轴电缆调谐方法，将PZT纤维复合材料和PbTiO3陶瓷换能器的阻抗匹配到50Q。使用平板石英靶的脉冲/回波响应测试了换能器的双向损耗和-6分贝带宽。双向损耗为21~46分贝，带宽为47~118%。在体外超声背向散射显微镜(UBM)图像被切除的人眼为每个设备，并用于比较成像性能。压力聚焦和透镜的应用都被证明是有用的高频光束聚焦方法。在等增益方案下，LiNbO_3和PbTiO_3传感器比其他材料具有更好的图像对比度。
The performance of high frequency, single-element transducers depends greatly on the mechanical and electrical properties of the piezoelectric materials used. This study compares the design and performance of transducers incorporating different materials. The materials investigated include 1-3 lead zirconate titanate (PZT) fiber composite, lead titanate (PbTiO3) ceramic, poly(vinylidene fluoride) (PVDF) film, and lithium niobate (LiNbO3) single crystal. All transducers were constructed with a 3-mm aperture size and an f-number between 2 and 3. Backing and matching materials were selected based on design goals and fabrication limitations. A simplified coaxial cable tuning method was employed to match the transducer impedance to 50 Q for the PZT fiber composite and PbTiO3 ceramic transducers. Transducers were tested for two-way loss and -6 dB bandwidth using the pulse/echo response from a flat quartz target. Two-way loss varied from 21 to 46 dB, and bandwidths measured were in the range from 47 to 118%. In vitro ultrasonic backscatter microscope (UBM) images of an excised human eye were obtained for each device and used to compare imaging performance. Both press-focusing and application of a lens proved to be useful beam focusing methods for high frequency. Under equal gain schemes, the LiNbO3 and PbTiO3 transducers provided better image contrast than the other materials.