Budyn Nicolas, Bevan Rhodri L T, Zhang Jie, Croxford Anthony J, Wilcox Paul D
IEEE Trans Ultrason Ferroelectr Freq Control. 2019 Apr 11. doi: 10.1109/TUFFC.2019.2909988.
The multi-view total focusing method (TFM) is an imaging algorithm for ultrasonic full matrix array data that exploits internal reflections and mode conversions in the inspected object to create multiple images, the views. Modelling the defect response in multi-view TFM is an essential first step in developing new detection and characterisation methods which exploit the information present in these views. This paper describes a ray-based forward model for small two-dimensional defects and compares its results against finite-element simulations and experimental data for the inspection of a side-drilled hole, a notch and a crack. A simpler version of this model, based on a single-frequency approximation, is derived and compared. A good agreement with the multi-frequency model and a speed-up of several orders of magnitude are achieved.
多视图全聚焦方法（TFM）是一种用于超声全矩阵阵列数据的成像算法，它利用被检测对象中的内部反射和模式转换来创建多个图像，即视图。对多视图TFM中的缺陷响应进行建模是开发利用这些视图中存在的信息的新检测和表征方法的重要第一步。本文描述了一种用于二维小缺陷的基于射线的正向模型，并将其结果与有限元模拟以及用于检测侧钻孔、缺口和裂纹的实验数据进行了比较。推导并比较了基于单频近似的该模型的简化版本。该简化版本与多频模型取得了良好的一致性，并且速度提高了几个数量级。
