Department of Physics, Division of Material Physics, Faculty of Science, University of Helsinki, P.O.B. 64, 00014, Helsinki, Finland.
Finnish Geospatial Research Institute, Geodeetinrinne 2, 02430, Masala, Finland.
Sci Rep. 2021 Jul 26;11(1):15191. doi: 10.1038/s41598-021-94084-w.
The primary goal of this study is to localize a defect (cavity) in a curved geometry. Curved topologies exhibit multiple resonances and the presence of hotspots for acoustic waves. Launching acoustic waves along a specific direction e.g. by means of an extended laser source reduces the complexity of the scattering problem. We performed experiments to demonstrate the use of a laser line source and verified the experimental results in FEM simulations. In both cases, we could locate and determine the size of a pit in a steel hemisphere which allowed us to visualize the defect on a 3D model of the sample. Such an approach could benefit patients by enabling contactless inspection of acetabular cups.
本研究的主要目的是定位弯曲结构中的缺陷（空洞）。弯曲拓扑结构表现出多个共振，并存在声波动的热点。通过沿特定方向发射声波动（例如，通过扩展激光源）可以降低散射问题的复杂性。我们进行了实验来演示使用激光线源，并在有限元模拟中验证了实验结果。在这两种情况下，我们都可以定位并确定钢半球中的凹坑的大小，从而可以在样品的 3D 模型上可视化缺陷。这种方法可以通过实现对髋臼杯的非接触式检查而使患者受益。
