Patent ID: 8183862

Claim:
An eddy current testing device comprising: an eddy current probe for inspecting a change in characteristics of a target object: phase angle calculation means for calculating a phase angle of a signal detected by said eddy current probe; image data generator for generating image data which indicates the phase angle in coordinates in which at least one of the position of a portion from which the signal is detected, and a time when the signal is detected from the portion, is plotted along a coordinate axis, or generating image data which indicates information based on the phase angle in the coordinates; and output means for outputting the image data generated by said image data generator, wherein said eddy current probe has at least one excitation coil, a first detection coil and a second detection coil, the first detection coil being arranged adjacent to one side of the excitation coil and the second detection coil being arranged adjacent to another side of the excitation coil; said phase angle calculation means calculates a first phase angle of a first signal detected by the first detection coil and a second phase angle of a second signal detected by the second detection coil; said image data generator generates first image data and second image data, the first image data indicating the first phase angle in coordinates in which at least one of the position of a portion of the target object from which the first signal is detected, and a time when the first signal is detected from the portion, is plotted along a coordinate axis, the second image data indicating the second phase angle in coordinates in which at least one of the position of a portion of the target object from which the second signal is detected, and a time when the second signal is detected from the portion, is plotted along a coordinate axis; and said output means outputs the first image data and the second image data, which are generated by said image data generator.