In the eddy current flaw detection probe and the eddy current flaw detection device and the eddy current flaw detection

摘要

PROBLEM TO BE SOLVED: To provide an eddy current flaw detecting probe capable of circumventing reduction in the reliability of detecting defects resulting from a defect-forming state, without having an operation of arrangement change, driving control, or the like, of an excitation coil accompany it.;SOLUTION: This eddy current flaw detecting probe comprises an excitation coil group consisting of a first excitation coil 11, a second excitation coil 12, and a third excitation coil 13 for inducing eddy current in a flaw detecting object such as a metallic conduit 20, and a detecting coil 14 for detecting the variation in the eddy current generated in a part of the defect 21, such as, cracks in the flaw detecting object. The center axes of respective excitation coils are set in the mutually different directions. Then, the direction of composite eddy current obtained by vector-composing eddy currents E1, E2 and E3 induced by the excitation coil group is made variable, by strength control of current supplied to each excitation coil, and the composite eddy current sufficiently varies, with respect to various forming states of the defect 21.;COPYRIGHT: (C)2009,JPO&INPIT