| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rust detecting device and method for detecting the rust occurrence of an inspecting object non-destructively at high sensitivity. Ž<P>SOLUTION: This rust detecting device comprises: an exciting coil 11 for supplying a magnetic field to the inspecting object as a magnetic substance; a detecting coil 21 constituting a first magnetic circuit passing the inspecting object together with the exciting coil 11; and a detecting coil 22 constituting a second magnetic circuit passing the inspecting object together with the exciting coil 11. The detecting coils 21 and 22 are interconnected in series so as to offset the magnetic field component of the same phase, and output, as a differential signal, magnetic resistance variation resulting from the rust occurrence of the inspecting object. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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