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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >TRANSMISSION COEFFICIENT FOR MULTI-LAYERED STRUCTURES AT ARBITRARY INCIDENT ANGLE
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TRANSMISSION COEFFICIENT FOR MULTI-LAYERED STRUCTURES AT ARBITRARY INCIDENT ANGLE

机译：任意入射角下多层结构的透射系数

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Widespread adoption of process inspection is dependent on reduction of cost. In many applications the part geometry may not be known or may be sufficiently complex that it would be desirable to not follow all of the part contours. Fortunately, in cases where refraction of the wave between the coupling fluid and the part is low, relatively complex parts may be scanned without precisely following the part contours. This paper explores a problem where a complex part is scanned with a limited number of degrees of freedom in the scanning system. The close acoustic impedance match between the rubber part and the water coupling fluid allows this to be done efficiently. However, the refraction and attenuation of the wave in the material is still sufficiently high that it may be necessary to correct the amplitude of the received signal to account for the part geometry. Matrix propagator methods are used to create a model which will allow the effect of amplitude variation on the received signal to be explored for the curved specimen. The magnitude of the received signal will be adjusted to be equivalent to a normally incident wave. The system which motivates this work is shown in Figure 1. In order to reduce the number of axes required to scan the tire section, four paintbrush transducers are used as transmitters. Four standard small diameter transducers are mounted in a scanning head and used as receivers. The entire sample can be scanned with two axes of motion as shown. However, the incident wave is not normal to the surface of the sample and may be as much as 20 degrees from normal. Detection of disbonds and material property changes at different locations on the sample must be obtained. The sample is modeled as five layers of a linear visco-elastic solid with measured or calculated materials properties.
机译：流程检查的广泛采用取决于成本的降低。在许多应用中，零件的几何形状可能是未知的，或者可能非常复杂，以至于希望不遵循所有零件轮廓。幸运的是，在耦合流体和零件之间的波折射较低的情况下，可以扫描相对复杂的零件，而不必精确地遵循零件轮廓。本文探讨了在扫描系统中以有限的自由度扫描复杂零件的问题。橡胶部件和水耦合液之间的声阻抗匹配非常紧密，可以有效地完成此任务。但是，材料中波的折射和衰减仍然足够高，以至于有必要校正接收信号的幅度以解决零件的几何形状。矩阵传播器方法用于创建一个模型，该模型将允许对弯曲样本探索振幅变化对接收信号的影响。接收信号的大小将被调整为等于法向入射波。激发这项工作的系统如图1所示。为了减少扫描轮胎部分所需的轴数，使用了四个画笔传感器作为变送器。四个标准的小直径传感器安装在扫描头中并用作接收器。如图所示，可以用两个运动轴扫描整个样品。但是，入射波不垂直于样品表面，可能与垂直方向成20度角。必须获得样品不同位置的脱胶和材料性能变化的检测。将样品建模为具有测量或计算的材料特性的五层线性粘弹性固体。

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