The generation and detection of longitudinal guided waves in thin fibers using a conical transformer
The generation and detection of longitudinal guided waves in thin fibers using a conical transformer
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使用锥形变压器在细光纤中产生和检测纵向导波
DOI：
10.1109/58.935721
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
G. Hayward
中科院分区：
文献类型：
--
作者：
D. Atkinson;G. Hayward
本文介绍了一种将超声能量从压电陶瓷盘换能器耦合到光纤波导中以诱导纵向传播的技术。聚合物锥体用于将光纤波导结合到盘的表面上，并用作机械Transformer，将其基部处的横向位移转换成其顶点处的纵向位移。宽带有限元分析（FEA）的结果表明，键合有效地耦合到光纤波导的纵向模式激励的光盘换能器的径向模式。此外，窄带有限元分析被用来研究如何的几何形状和材料特性的债券和波导的影响耦合效率。该技术，然后量化的信号相干噪声比（SCNR），反映其产生所需的纵向波导模式和拒绝错误的模式的能力。最后，设计参数概述了成功实施这项技术。
This paper describes a technique to couple ultrasonic energy from a piezoceramic disc transducer into a fiber waveguide to induce longitudinal propagation. A polymer cone is utilized to bond the fiber waveguide onto the surface of the disc and to behave as a mechanical transformer, converting lateral displacements at its base into longitudinal displacements at its apex. Wideband finite element analysis (FEA) results are provided to show that the bond efficiently couples the radial modes of a disc transducer into fiber waveguides for longitudinal mode excitation. Furthermore, narrowband FEA is utilized to investigate how the geometry and material properties of the bond and waveguide influence the coupling efficiency. The technique is then quantified in terms of signal-to-coherent noise ratio (SCNR), reflecting its ability to generate the desired longitudinal waveguide mode and reject erroneous modes. Finally, design parameters are outlined for the successful implementation of this technique.