Design and fabrication of a 40-MHz annular army transducer
Design and fabrication of a 40-MHz annular army transducer
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DOI：
10.1109/tuffc.2005.1428050
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发表时间：
2005-04-01
影响因子：
3.6
通讯作者：
Lizzi, FL
中科院分区：
文献类型：
--
作者：
Ketterling, JA;Aristizábal, O;Lizzi, FL
本文研究了制作一个五环，聚焦环形阵列换能器工作在40 MHz的可行性。换能器的有源压电材料是9 μ m厚的聚偏氟乙烯（PVDF）膜。PVDF的一侧用金金属化，并形成换能器的接地层。换能器的阵列图案和到每个环的电迹线形成在覆铜聚酰亚胺膜上。PVDF和聚酰亚胺用环氧树脂薄层粘合，压制成球形弯曲形状，然后用环氧树脂回填。制作并测试了一个具有等面积单元和100 μ m环隙的五环换能器。换能器的总孔径为6 mm，几何焦点为12 mm。每个环测量了位于几何焦点处的石英板的脉冲/回波响应、双向插入损耗（IL）、复阻抗、电串扰和横向波束宽度。来自每个元件的复阻抗数据用于执行电匹配，并且重复测量。阻抗匹配后，f（c）约为36 MHz，-6 dB带宽为31 ~ 39%。匹配环的IL范围为-28至-38 dB。
This paper investigates the feasibility of fabricating a five-ring, focused annular array transducer operating at 40 MHz. The active piezoelectric material of the transducer was a 9-mu m thick polyvinylidene fluoride (PVDF) film. One side of the PVDF was metallized with gold and forms the ground plane of the transducer. The array pattern of the transducer and electrical traces to each annulus were formed on a copper-clad polyimide film. The PVDF and polyimide were bonded with a thin layer of epoxy, pressed into a spherically curved shape, then back filled with epoxy. A five-ring transducer with equal area elements and 100-mu m kerfs between annuli was fabricated and tested. The transducer had a total aperture of 6 mm and a geometric focus of 12 mm. The pulse/echo response from a quartz plate located at the geometric focus, two-way insertion loss (IL), complex impedance, electrical crosstalk, and lateral beamwidth all were measured for each annulus. The complex impedance data from each element were used to perform electrical matching, and the measurements were repeated. After impedance matching, f(c) approximate to 36 MHz and -6-dB bandwidths ranged from 31 to 39%. The ILs for the matched annuli ranged from -28 to -38 dB.