MAGNETIC MINIDEFECTOSCOPE FOR NONDESTRUCTIVE INSPECTION OF FERROMAGNETIC BODIES
Michal Lesňák – Jaromír Pištora
The paper is devoted to the modeling, construction, and testing of new magnetic minidefectoscope for nondestructive diagnostics of cylindrical ferromagnetic bodies (wipes, cylinders, etc.) with the diameters from 14 to 40 millimeters. This defectoscope has universal construction, which enables to apply it for the inspection of steel ropes too. The geometrical parameters of defectoscope have been determined to have the possibility to specify the minimal longitudinal defects of 100 micrometers. The sensing unit has been realized as one channel sort. The defects detahils ave been analyzed with help of special software. The sensitivity has been tested in the laboratory by etalon samples with determined defects. The results show the level of 0.8% for material cross section change can be unambiguously specified.
Keywords: electromagnetic field modeling, magnetic measurements, sensor, nondestructive testing