| 摘要 |
PROBLEM TO BE SOLVED: To provide a self-comparing type eddy current flaw detector reducing the erroneous judgment of a flaw than before. SOLUTION: In the self-comparing type eddy current flaw detector equipped with two coils different in polarity connected so as to be separated by a definite distance to detect an eddy current generated by applying an AC magnetic field to an object to be inspected, a positive polarity judge circuit and a negative polarity judge circuit for comparing positive and negative polarity signals with a threshold value corresponding to the polarity of the signal from a detector and a waiting time measuring circuit for measuring the time up to the detection of the negative polarity signal corresponding to the signal after judging the positive polarity signal are provided as a flaw judge circuit.
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