Title :
Eddy current interaction with a thin-opening crack in a plate conductor
Author :
Dezhi, Chen ; Shao, K.R. ; Jianni, Sheng ; Weili, Yan
Author_Institution :
Dept. of Electr. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China
fDate :
7/1/2000 12:00:00 AM
Abstract :
In eddy current testing (ECT), a thin-opening crack in a plate conductor is frequently encountered. The eddy current field perturbation due to the crack may be described as the effect produced by an equivalent current dipole layer located on its surface. The dipole density may be found by solving a boundary integral equation. In this paper, formulas of the electric dyadic Green´s function for a limited thickness plate are derived. Following a moment method scheme, numerical predictions are made for benchmark models of ECT for steam generator. The eddy current perturbations due to the cracks are calculated. The probe impedance changes are also evaluated and are compared with experiments, and good agreement is found
Keywords :
Green´s function methods; boilers; boundary integral equations; crack detection; eddy current testing; method of moments; benchmark models; boundary integral equation; dipole density; eddy current interaction; eddy current testing; electric dyadic Green´s function; equivalent current dipole layer; moment method scheme; plate conductor; probe impedance changes; steam generator; thin-opening crack; Conductors; Eddy current testing; Eddy currents; Electrical capacitance tomography; Green´s function methods; Integral equations; Moment methods; Predictive models; Probes; Surface cracks;
Journal_Title :
Magnetics, IEEE Transactions on
