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Signal Analysis of Eddy Current Array Probe According to Size Variation of FBH Defects  

Kim, Ji-Ho (Department of Electrical Engineering, Soongsil University)
Lim, Geon-Gyu (Department of Electrical Engineering, Soongsil University)
Lee, Hyang-Beom (Department of Electrical Engineering, Soongsil University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.29, no.2, 2009 , pp. 137-144 More about this Journal
Abstract
In this paper, the signal analysis of eddy current array probe was performed to analyze the electromagnetic characteristics with the variation of FBH(flat bottomed hole) defects size on steam generator tube in NPP(nuclear power plants) using the electromagnetic finite element method. To obtain the electromagnetic characteristic of probes, the governing equation was derived from Maxwell's equations, and the individual problem was analyzed by using the 3-dimensional finite element method. For the simulation FBH defects were used. The depth of FBH defects were 20%, 40%, 60%, 80% and 100% of steam generator(SG) tube thickness, and it was assumed that the defects were located on the tube outside. And the operation frequencies of 100 kHz, 300 kHz and 400 kHz were used. Material of specimen was Inconel 600 which is usually used for SG tubes in NPP. The signal difference could be observed according to the size variation of depth of FBH defects and operation frequencies. The results in this paper can be helpful when the ECT(eddy current testing) signals from EC array probe are evaluated and analyzed.
Keywords
Eddy Current Testing(ECT); Steam Generator(SG) Tube; EC Array Probe; Finite Element Method;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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