コンクリート内の鉄筋及び配線の非破壊検査法 -コンクリート試験体を用いた実験結果-

概要

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We have developed a new system for nondestructive inspection (NDI) which enables accurate detection and easy handling at low cost. It works by measuring the impedance due to the change in inductance in a solenoid coil. This paper describes the validity of the method we used to design this NDI system. The change in impedance and phase difference were measured with an impedance meter. The fractional deviation in inductance L and impedance Z changes due to the magnetization induced with and without a steel bar. The reduction in inductance L due to the eddy currents of power cables was measured. The measurement also proved that this NDI system can distinguish steel bars from power cables by using the polarity of the phase difference similar to what occurs in real concrete walls and slabs.
社団法人　日本磁気学会の論文