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New method for real-time dynamic focusing through interfaces

机译：通过界面进行实时动态对焦的新方法

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In nondestructive evaluation (NDE) a coupling medium (wedge) is frequently inserted between the array probe and the object being evaluated. In this situation, focal law computing is complicated by the refraction effects at the interface. Furthermore, there are not known techniques to perform dynamic focusing by hardware in these conditions. This work addresses these problems by following a two-step procedure. First, a virtual array that operates in a single medium with nearly equivalent time-of-flight to the foci is obtained. Then, simple hardware is proposed to perform dynamic focusing in real-time. It operates with arrays of any geometry as required by the virtual array in presence of arbitrarily shaped interfaces. The paper describes the theory and evaluates the timing errors of the approximations made. These errors are low enough to allow use of the new technique in most NDE and some specific medical applications. The new technique is validated by simulation and experimentally.
机译：在非破坏性评估（NDE）中，经常将耦合介质（楔形物）插入阵列探针和要评估的对象之间。在这种情况下，界面处的折射效应会使焦点定律的计算复杂化。此外，尚不存在在这些条件下通过硬件执行动态聚焦的已知技术。这项工作通过遵循两个步骤来解决这些问题。首先，获得在单个介质中以与焦点几乎相等的飞行时间运行的虚拟阵列。然后，提出了简单的硬件来实时执行动态聚焦。在存在任意形状的界面的情况下，它可以与虚拟阵列所需的任何几何形状的阵列一起运行。本文描述了该理论，并评估了所近似的时序误差。这些错误足够低，可以在大多数NDE和某些特定的医疗应用中使用新技术。通过仿真和实验验证了该新技术。

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