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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Measurement models for ultrasonic nondestructive evaluation
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Measurement models for ultrasonic nondestructive evaluation

机译：超声波无损评估的测量模型

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The article reviews ways to use the electromechanical reciprocitynrelation to construct theoretical models of measurement processes innultrasonic nondestructive evaluation. This relationship is importantnbecause it connects the change in the voltages measured at thenelectrical terminal of the transducer to the perturbation in thenmechanical wavefield caused by the change in the propagationnenvironment. It does so by mixing an unperturbed reference wavefieldnwith one containing the perturbed wavefield. Two problems of progressivendifficulty are explored. We begin by investigating the imaging of anone-dimensional sinusoidal fluid-solid interface using a cylindricallynfocused beam and continue by developing a model of the imaging of thenmechanical properties of a two-dimensional, thin solid film using anconfocal arrangement of point-focused transducers. This last problemnuses an approximation to the thin solid film, which reduces itsnmechanical response to one similar to that of a membrane. Integralnrelations are given that can be used to form integral equations or tongenerate asymptotic approximations to the particle displacements andnstresses in the film
机译：本文回顾了利用机电互相关关系构建超声非破坏性评估过程的理论模型的方法。该关系很重要，因为它将在换能器的电气端子处测得的电压变化与由传播环境变化引起的机械波场中的扰动联系起来。它通过将未扰动的参考波场与包含扰动的波场的参考波场混合来实现。探讨了进行困难的两个问题。我们首先研究使用圆柱聚焦束对一维正弦流体-固体界面的成像，然后继续通过使用点聚焦换能器的共聚焦布置开发二维薄固体膜的机械性能成像模型。最后一个问题是近似于固体薄膜，这将其机械响应减小到类似于膜的机械响应。给出了可以用于形成积分方程或对薄膜中的颗粒位移和应力进行色调生成渐近逼近的积分关系

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