To accurately judge the presence or absence of a gap between the metal body of an insulation covering metal body and an insulation covering layer with the insulation covering metal body that runs on a line as a target.
Each sensor of a distance meter A, a distance meter B, and a capacitance meter C is successively arranged in an advancing direction on a line where a metal body 3 and an insulation covering metal body 2 with an insulation covering layer 4 on its surface run, a distance to the surface of the metal body 3 is measured by the distance meter A for the same point of the running insulation covering metal body 2, and a distance to the surface of the insulation covering layer 4 is measured by the distance meter B. Then, capacitance to the surface of the metal body 3 is measured by the capacitance meter C and the presence or absence of the gap between the metal body 3 and the insulation covering layer 4 of the insulation covering metal body 2 is judged from the measurement values.
MIYATA SHIRO
FUJITA TOSHIAKI
KAWAMURA TADASHI
OKANO YOSHIHIRO
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