EDDY CURRENT FLAW DETECTION PROBE AND EDDY CURRENT FLAW DETECTION TESTING DEVICE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an eddy current flaw detection probe capable of preventing a radiation magnetic field from interfering with a detection magnetic field by radiating a magnetic field only from a magnetic field radiation surface of an exciting coil.;SOLUTION: An eddy current flaw detection probe 3 comprises: an exciting coil 4 that is disposed with one end surface opposite to a flaw detection surface 100, radiates a magnetic field to the flaw detection surface 100 and generates an eddy current on the flaw detection surface 100 and inside the flaw detection surface 100; a detection coil 8 that is disposed with one end surface opposite to the flaw detection surface 100 and detects a magnetic field generated by variations in the eddy current; and an exciting coil ferrite core 5 that has an axial core portion 5a provided as an axial core of the exciting coil 4 and a protrusion portion protruding from the end surface of the exciting coil 4 opposite to the flaw detection surface 100. A magnetic field shield member 7 is provided on surfaces excluding a magnetic field radiation surface of the protrusion portion of the exciting coil ferrite core 5 via a magnetic field insulation member 6. The exciting coil ferrite core 5 and the magnetic field shield member 7 are formed of a ferromagnetic material such as iron or ferrite.;COPYRIGHT: (C)2013,JPO&INPIT