Title :
Impedance calculation for a plate with crack in eddy current NDT using 3D indirect BIEM
Author :
Lee, Hyang-Beom ; Kim, Dong-Hun
Author_Institution :
Dept. of Electr. Eng., Soongsil Univ., Seoul, South Korea
fDate :
9/1/2000 12:00:00 AM
Abstract :
By using the 3-dimensional indirect boundary integral equation method (BIEM), the effective impedance calculation method for a plate with crack in eddy current nondestructive testing (NDT) is proposed. The procedure of the indirect BIEM makes it possible that only one LU decomposition processing of the system matrix is used for the full processing of the NDT analysis. The impedance signal of the pancake type absolute circular air-cored coil probe is used for the detection of the crack in the plate. The mesh is coarse far from the crack and the impedance signal can have some numerical error. By using the impedance subtraction method, the error is reduced and effective impedance signal is obtained. The effective impedance signal is compared with the experimental signal. The agreement of the signal pattern shows the validity of the proposed method
Keywords :
boundary integral equations; crack detection; eddy current testing; electric impedance; probes; 3D indirect BIEM; LU decomposition processing; crack; eddy current NDT; impedance calculation; impedance signal; impedance subtraction method; indirect boundary integral equation method; pancake type absolute circular air-cored coil probe; plate; signal pattern; system matrix; Coils; Eddy currents; Electromagnetic analysis; Impedance; Integral equations; Matrix decomposition; Mesh generation; Nondestructive testing; Probes; Solid modeling;
Journal_Title :
Magnetics, IEEE Transactions on
