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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Response of acoustic imaging systems using convergent leaky waves to cylindrical flaws
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Response of acoustic imaging systems using convergent leaky waves to cylindrical flaws

机译：使用会聚泄漏波的声学成像系统对圆柱缺陷的响应

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摘要

A theoretical study of imaging systems utilizing focused leaky surface acoustic waves (SAWs), and their response to certain kind of defects is presented. In particular, circular cylindrical inhomogeneities with axes perpendicular to the surface are considered. The scattering of the SAW from this cylinder is formulated with some approximations. The surface wave incident on the inhomogeneity is initially found as an angular spectrum of plane waves. However, to apply the boundary conditions at the cylindrical surface, the incident field has to be transformed into a superposition of cylindrical waves. Similarly, the scattered field, which is found in the form of outgoing cylindrical SAWs, is converted back to a plane wave spectrum. A formula is obtained for the transducer output voltage in terms of the position and the radius of the cylinder, and it is suitable for computer evaluation. By considering various locations for the cylinder, the sensitivity of the system around the focal point is studied. By comparing the output voltages for cylinders of different radii, the sensitivity of the system to the size of the inhomogeneity is examined. The numerical results are in agreement with the experimental observations.
机译：提出了利用聚焦泄漏表面声波（SAW）的成像系统及其对某种缺陷的响应的理论研究。特别地，考虑具有垂直于表面的轴线的圆柱形不均匀性。 SAW从此圆柱体的散射近似表示。最初发现入射在不均匀性上的表面波是平面波的角谱。但是，为了在圆柱表面施加边界条件，必须将入射场转换为圆柱波的叠加。类似地，以外出圆柱SAW的形式发现的散射场被转换回平面波谱。根据圆柱体的位置和半径获得了换能器输出电压的公式，该公式适用于计算机评估。通过考虑圆柱体的不同位置，研究了焦点周围系统的灵敏度。通过比较不同半径的圆柱体的输出电压，可以检查系统对不均匀性大小的敏感性。数值结果与实验结果一致。

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