| Title |
Signal Analysis of Eddy Current Test Using T/R Coil Probe for Inspection of Steam Generator Tube in NPP |
| Authors |
Geon-Gyu Lim ; Hyang-Beom Lee |
| Keywords |
ECT array probe ; Eddy current test ; FEM ; T/R coil ; Steam generator tube |
| Abstract |
In this paper the signal analysis of eddy current test using transmit-receive(T/R) pancake coil of ECT array probe using electromagnetic finite element method(FEM) is performed For characteristics analysis, the notch defect is used. The depth of defect is 40[%] of steam generator tube thickness, and inside defect and outside defect are used as simulation examples. The signal analysis is performed according to the variation of receive coil position. The receive coil is positioned 0[°], 30[°], 60[°], 90[°] of circumferential position of transmit coil. To obtain the electromagnetic characteristics of probes, the governing equation is derived from Maxwell"s equations, and the problem is solved using the 3-dimensional finite element method. The signal magnitude of inside defect is bigger than that of outside defect, and the signal difference can be seen according to the variation of position of receive coil. The experimental signal and numerical signal of ASME standard tube show similar results. The results in this paper can be helpful when the ECT signals from ECT array probe are evaluated and analyzed. |