| 摘要 |
PROBLEM TO BE SOLVED: To detect microflaws, without adjusting the sensitivity of an amplifier of a leakage flux detector by improving the sensitivity of the leakage flux sensor by taking a simple technical means. SOLUTION: A ferromagnet 21 is disposed near a magnetic sensor 20 of the leakage flux detector. In this case, it is preferable that the ferromagnet 21 be attached detachable to the magnetic sensor 20 or its vicinity.
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