FLAW DETECTION PROBE

PROBLEM TO BE SOLVED: To provide a flaw detection probe estimating easily the depth of a flaw based on an output, without worsening detection precision of the flaw. SOLUTION: A conductor is wound in an angled barrel shape having a polygon of a cross section perpendicular to the center axis to form an excitation coil 11, and an annular detection coil 12 is arranged to surround one side face of the angled barrel shape of excitation coil 11 to constitute the flaw detection probe 1. The one side face of the excitation coil 11 surrounded by the detection coil 12 is made to serve as a flaw detection surface of the flaw detection probe 1. A part with a parallel component being maximum with respect to a surface of a flaw detection object in a magnetic field generated by the excitation coil 11 and a part with a perpendicular component being maximum therewith are positioned together inside the detection coil 12 to obtain a simple increase relation between the depth of the flaw and the output from the flaw detection probe 1. The depth of the flaw is easily estimated based on the output from the flaw detection probe 1, without worsening the detection precision of the flaw, since an S/N ratio is enhanced compared with the case of a small diameter of the detection coil 12. COPYRIGHT: (C)2011,JPO&INPIT