Patent ID: 7759931

Claim:
A magnetic impedance measurement device comprising: an apply coil for generating an alternate magnetic field of variable frequency, said apply coil being arranged at a distance from a test object, an exciting power source for exciting said apply coil, a pair of magnetic sensor means for detecting orthogonal vector components (X, Y) of a magnetic field generated from the test object, the vector components (X, Y) being parallel to a face of the apply coil, said face of the apply coil being perpendicular to a central axis of said apply coil, said pair of magnetic sensor means being arranged between said face of the apply coil and said test object at a distance from the face of the apply coil and in proximity to said test object, a measurement means for measuring a detected signal having been detected by said pair of magnetic sensor means, and an analysis means for synthesizing the detected vector components (X, Y) and imaging an induced eddy current in said test object.