LEAKAGE MAGNETIC FLUX FLAW DETECTION DEVICE OF THIN STEEL STRIP AND FLAW DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a leakage magnetic flux flaw detection device of a thin steel strip capable of cutting a low frequency signal detected by a magnetic sensor to leave a higher frequency signal behind in need of no many speed follow-up type high pass filters, and a flaw detection method.;SOLUTION: A leakage magnetic flux flaw detection device of a thin steel strip detects a flaw by detecting a magnetic flux that leaks outside due to a flaw in a DC magnetized thin steel strip, and includes a magnetic sensor in which search coils of the same number of turns are wound at a near location to and a distant location from the thin steel strip, respectively on a central leg of an E-type ferromagnetic material core to perform differential connection in series.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT