A planar EMT system for the detection of faults on thin metallic plates
作者： W Yin , A J Peyton
DOI: 10.1088/0957-0233/17/8/011
关键词: Planar 、 Conductor 、 Sensor array 、 Inductance 、 Electromagnetic coil 、 Acoustics 、 Planar array 、 Electrical engineering 、 Electrical conductor 、 Electromagnetic induction 、 Materials science
摘要: This paper describes a novel planar electromagnetic tomography system for the detection of conductivity inhomogeneity on metallic plate. The proposed differs from traditional inductance (EMT) systems in its spatial arrangements coils. Sensor coils are distributed to form circular array with their axes not parallel but perpendicular plate under inspection. forward solution sensor next homogeneous conductive is based analytical provided by Cheng. sensitivity matrix prototype was computed numerical evaluation solution. For inverse solution, modified Newton?Raphson method used adjust distribution fit set inductances measured least-squared sense. Frequency- dependent analysis performed find an optimum testing frequency. far-field and near-field effects electrical discussed. Good estimates were obtained at Experimental tests taking difference mutual coil pairs when placed reference conductor faults. Inverse results experimental data verified this method.
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