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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >ULTRASONIC TRANSDUCER BEAMS MODEL, USING TRANSIENT ANGULAR SPECTRUM
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ULTRASONIC TRANSDUCER BEAMS MODEL, USING TRANSIENT ANGULAR SPECTRUM

机译：使用瞬态角谱的超声传感器梁模型

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摘要

A method for modeling the ultrasonic transducer field in any medium has been developed. This method can take into account the crossing of a plane interface separating two media. This model takes into account the transient side of the field, with the help of an extension of angular spectrum notion. Indeed, it has been shown that a change of variable (components of the slowness vector instead of those of the wave number vector) at the spatio-temporal spectrum level, permits, for each propagation direction, the response signal to be reconstructed. In this way, a decomposition into transient plane waves (transient angular spectrum) is obtained. The recomposition at any point of the field is then no more than a summation, with the suitable delays of all these plane waves. The advantage of this method is that the decomposition into transient plane waves, which is the longest operation, has to be performed just once, for a given transducer. The adaptation to varied geometrical configurations (interface, incident angle,...) is only taken into account at the step of the final recomposition. The presented results have been interpreted in terms of geometrical wave and edge waves. Subsequently, it will permits the integration to be simplified, by taking into account only the waves of which the summation does contribute to the resulting signal.
机译：已经开发出一种在任何介质中建模超声换能器场的方法。该方法可以考虑分离两个介质的平面界面的交叉。该模型借助角谱概念的扩展考虑了场的瞬态面。实际上，已经显示出，在时空频谱水平上的变量（慢度矢量的分量而不是波数矢量的分量）的改变允许对于每个传播方向重构响应信号。以此方式，获得了分解成瞬态平面波（瞬态角谱）的信息。这样，在所有这些平面波的适当延迟下，在场的任何点处的重组仅是求和。这种方法的优点是，对于给定的换能器，分解为瞬态平面波的时间最长，仅需执行一次。仅在最终重组的步骤中才考虑对各种几何构造（界面，入射角等）的适应性。提出的结果已根据几何波和边波进行了解释。随后，通过仅考虑求和确实对所产生的信号有贡献的波，就可以简化积分。

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