2F-1 Fabrication and Performance of a High-Frequency Geometrically Focussed Composite Transducer with Triangular Pillar Geometry
2F-1 Fabrication and Performance of a High-Frequency Geometrically Focussed Composite Transducer with Triangular Pillar Geometry
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2F-1 具有三角柱几何形状的高频几何聚焦复合换能器的制造和性能
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
F. S. Foster
中科院分区：
文献类型：
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作者：
J. A. Brown;E. Chérin;Jianhua Yin;F. S. Foster
制作了一个单元件，40 MHz，直径3 mm，几何焦点为9 mm的换能器。该传感器基于压电复合衬底和三角形复合柱。换能器产生的脉冲的双向带宽为55%。带宽和阻抗幅值与有限元模型预测结果一致。用针式水听器采集单向辐射图。测量到几何焦点处单向-3 dB波束宽度为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 μ m非常吻合。然后将三角柱复合传感器与方形复合传感器进行了比较。发现三角柱复合材料的二次共振幅度降低了12 dB。
A single-element, 40 MHz, 3 mm diameter transducer was fabricated with a geometric focus at 9 mm. The transducer was based on a piezo-composite substrate with triangular-shaped composite pillars. The transducer produced pulses with a two-way bandwidth of 55 %. The bandwidth 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 oneway -3 dB beamwidth at the geometric focus was measured to be 120 mum and the -3 dB depth-of-field was 2.5 mm This is in good agreement to the theoretical predictions of 112.5 mum and 2.4 mm The triangular-pillar composite transducer was then compared to a transducer with square composite pillars. A 12 dB reduction in the amplitude of the secondary resonance was found for the triangular- pillar composite.