Ostrowska Ksenia, Sładek Jerzy, Wołkanowski Paweł, Dominik Ireneusz, Owczarek Danuta, Nykiel Marek, Tomczyk Krzysztof, Stoliński Michał
Mechanical Faculty, Cracow University of Technology, Jana Pawła II 37 avenue, 31-864 Krakow, Poland.
Faculty of Mechanical Engineering and Robotics, AGH University of Krakow, al. Adama Mickiewicza 30, 30-059 Krakow, Poland.
Materials (Basel). 2024 Dec 17;17(24):6172. doi: 10.3390/ma17246172.
The CT (computed tomography) scanner has been used for many years now not only for medical measurements but also in many industries, for example, in defectoscopy for measuring sheet thickness and checking the joining of materials, as well as for measuring the geometry of individual components. This type of scanner is a good complement to coordinate contact and non-contact measurements for intra-structural measurements and inaccessible places. The variety of materials, however, makes it very difficult to select individual CT parameters. In this paper, a curve for selecting the maximum and minimum voltage of the lamp depending on the density of a given material is determined and an interpolation polynomial (1d with a third-degree polynomial) is used, by defining third-degree glued functions (cubic spline) to determine intermediate voltage values to a given material density, so as to determine full data ranges. This approach can facilitate the work of selecting scanning parameters for non-destructive testing, as this is a difficult process and sometimes consumes half of the measurement time. The practical experiments were carried out at the Accredited Coordinate Metrology Laboratory to develop a multi-criteria matrix for selecting CT measurement parameters for measurement accuracy. This approach reduced the time by an average of half an hour and effectively optimized the selection of scanning parameters.
计算机断层扫描（CT）扫描仪多年来不仅用于医学测量，还在许多行业中得到应用，例如，在探伤检查中用于测量板材厚度和检查材料的连接情况，以及测量单个部件的几何形状。这种类型的扫描仪是坐标接触式和非接触式测量的良好补充，可用于结构内部测量和难以到达的地方。然而，材料的多样性使得选择合适的CT参数变得非常困难。在本文中，根据给定材料的密度确定了用于选择灯的最大和最小电压的曲线，并使用了插值多项式（三次多项式的一维形式），通过定义三次胶合函数（三次样条）来确定给定材料密度下的中间电压值，从而确定完整的数据范围。这种方法可以方便无损检测中扫描参数的选择工作，因为这是一个困难的过程，有时会消耗一半的测量时间。实际实验是在认可的坐标计量实验室进行的，目的是开发一个多标准矩阵，用于选择CT测量参数以确保测量精度。这种方法平均减少了半小时的时间，并有效地优化了扫描参数的选择。
