Fabrication and Performance of High-Frequency Composite Transducers with Triangular-Pillar Geometry
Fabrication and Performance of High-Frequency Composite Transducers with Triangular-Pillar Geometry
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DOI：
10.1109/tuffc.2009.1106
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发表时间：
2009-04-01
影响因子：
3.6
通讯作者：
Foster, F. Stuart
中科院分区：
文献类型：
--
作者：
Brown, Jeremy A.;Cherin, Emmanuel;Foster, F. Stuart
制作了一个40 MHz、直径3 mm、几何聚焦在9 nm的单元件换能器，该换能器基于三角形复合柱的压电复合基板。50%的2路带宽和阻抗幅度与使用有限元建模预测的一致。单向辐射模式收集使用针水听器。在几何焦点处的单向-3 dB波束宽度被测量为120 μ m，-3 dB景深为2.5 mm。这与理论预测的112.5 μ m和2.4 mm吻合得很好。然后将三角形柱复合换能器与具有类似体积分数的活性陶瓷的正方形复合柱的换能器进行比较。发现三角柱复合材料的二次共振幅度降低9.5 dB，双向脉冲带宽增益30%。一个256单元的30 MHz的线阵被制作作为一个初步的调查使用的三角形柱作为基板的高频线阵换能器。在体内图像生成与单元素和线性阵列换能器。
A single-element, 40-MHz, 3-mm diameter transducer was fabricated with a geometric focus at 9 ann. The transducer was based on a piezo-composite substrate with triangular-shaped composite pillars. The 2-way bandwidth of 50% and impedance magnitude were in agreement with that predicted using finite-element modeling. A one-way radiation pattern was collected using a needle hydrophone. The one-way -3 dB beamwidth at the geometric focus was measured to be 120 mu m and the -3 dB depth of field was 2.5 mm. This is in good agreement with the theoretical predictions of 112.5 mu m and 2.4 mm. The triangular-pillar composite transducer was then compared with a transducer with square composite pillaris with similar volume fraction of active ceramic. A 9.5 dB reduction in the amplitude of the secondary resonance was found for the triangular-pillar composite as well as a 30% gain in the 2-way pulse bandwidth. A 256-element 30-MHz linear array was fabricated as a preliminary investigation into the use of the triangular pillar as the substrate in a high-frequency linear array transducer. In vivo-images were generated with both the single-element and linear-array transducers.