| 摘要 |
In a thermographic test method for the local resolution detection and identification of defects near the surface in a test object, a region of the surface of the test object is heated up, for example inductively. A series of successive thermographic images, at time intervals, is recorded during a heat propagation phase, each thermographic image representing a local temperature distribution in a surface region, recorded by the thermographic image, of the test object. The thermographic images are used to determine temperature profiles assigned to the correct position, wherein each temperature profile assigned to the correct position is assigned to the same measuring region of the surface of the test item. Then, temporal progressions of temperature values are determined from the temperature profiles for a plurality of measuring positions of the measuring region that are recorded by the temperature profiles. These progressions are then evaluated on the basis of at least one evaluation criterion characterizing the heat flow in the measuring region. The method takes into account the heat flow in the region of the defects in question and offers, compared to conventional systems, better interference suppression and improved degree of separation between true defects and pseudo-defects. |
