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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >CALCULATION OF WIDEBAND ULTRASONIC FIELDS RADIATED BY WATER-COUPLED TRANSDUCERS INTO HETEROGENEOUS MEDIA
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CALCULATION OF WIDEBAND ULTRASONIC FIELDS RADIATED BY WATER-COUPLED TRANSDUCERS INTO HETEROGENEOUS MEDIA

机译：水耦合传感器辐照非均质介质的宽带超声场计算

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摘要

The model for predicting the field radiated into solids by ultrasonic transducer developed at CEA (Champ-Sons) has been extended to the case of heterogeneous media. It allows the calculation of reflected or refracted components at the various interfaces (inside the piece or at piece boundaries). Arbitrary geometry of interfaces (possibly defined by CAD) may be considered. The extension uses a pencil model for the propagation from an elementary source point to the calculation point. The pencil evolution is described by a matrix formulation. The overall matrix for the whole propagation process of a given pencil results from the product of elementary matrices, corresponding either to the crossing of an interface or to the propagation into a homogeneous medium. From this matrix is extracted an amplitude factor allowing the prediction of the elementary contribution of the source point to the overall impulse-response at the calculation point. Then, the field radiated by an arbitrary transducer is simply obtained by the further numerical integration over the radiating surface of the transducer. Since an impulse-response is computed for the field at a given calculation point, arbitrary excitation pulse may be considered. Examples have been given illustrating the new capabilities of the model. Other examples of application to the case of phased-array transducers may be found in Ref.
机译：CEA开发的用于预测由超声换能器辐射到固体中的场的模型（Champ-Sons）已扩展到异质介质的情况。它允许计算各种界面（工件内部或工件边界）的反射或折射分量。可以考虑接口的任意几何形状（可能由CAD定义）。该扩展使用铅笔模型进行从基本源点到计算点的传播。铅笔的演变由矩阵公式描述。给定铅笔整个传播过程的总体矩阵来自基本矩阵的乘积，对应于界面的交叉或传播到均匀介质中。从该矩阵中提取一个幅度因子，该幅度因子允许预测源点对计算点处总体脉冲响应的基本贡献。然后，通过在换能器的辐射表面上的进一步的数值积分，简单地获得任意换能器辐射的场。由于针对给定计算点处的场计算了脉冲响应，因此可以考虑使用任意激励脉冲。给出了说明该模型的新功能的示例。适用于相控阵换能器的其他示例可以在参考文献5中找到。

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