Обрання критерію оптимізації процедури теплового неруйнівного контролю

Abstract

The work implies a thermophysical model of the active thermographic inspection (ATC) process and investigates the influence of interference on the defect process. The influence of the inhomogeneity of the surface emissivity and the unevenness of heating on the formation of the useful signal and the interference signal is analyzed. According to the modeling results, the time dependences of the surface temperature of the control object, as well as the signal/interference components, are investigated. It is shown that the moment of maximum time of the useful signal does not coincide with the moment of maximum interference, which creates the possibility of optimizing the ATC procedure by choosing the optimal time of temperature field registration. The results obtained allow us to assess the influence of various factors on the accuracy of defect detection. It is established that the level of interference significantly affects the sensitivity of the method and the ability to detect defects that lie at different depths. The proposed approach can be used to improve the efficiency of non-destructive testing of materials and structures.