An inversion scheme for sizing of wall thinning defects from pulsed eddy current testing signals

2012 ◽  
Vol 39 (1-4) ◽  
pp. 203-211 ◽  
Author(s):  
Shejuan Xie ◽  
Zhenmao Chen ◽  
Li Wang ◽  
Toshiyuki Takagi ◽  
Tetsuya Uchimoto
Keyword(s):  
Eddy Current ◽  
Eddy Current Testing ◽  
Current Testing ◽  
Pulsed Eddy Current ◽  
Wall Thinning

scholarly journals The Effects of Lift-Off from Wall Thinning Signal in Pulsed Eddy Current Testing

2012 ◽  
Vol 17 (4) ◽  
pp. 298-301 ◽  
Author(s):  
Duck-Gun Park ◽  
C.S. Angani ◽  
M.B. Kishore ◽  
C.G. Kim ◽  
D.H. Lee
Keyword(s):  
Eddy Current ◽  
Eddy Current Testing ◽  
Current Testing ◽  
Pulsed Eddy Current ◽  
Wall Thinning ◽  
Lift Off

scholarly journals Wall Thinning Assessment for Ferromagnetic Plate with Pulsed Eddy Current Testing Using Analytical Solution Decoupling Method

2021 ◽  
Vol 11 (10) ◽  
pp. 4356
Author(s):  
Qing Zhang ◽  
Xinjun Wu
Keyword(s):  
Eddy Current ◽  
Plate Thickness ◽  
Reference Signal ◽  
Eddy Current Testing ◽  
Mean Value Theorem ◽  
Current Testing ◽  
Pulsed Eddy Current ◽  
Wall Thinning ◽  
Ferromagnetic Plate ◽  
Lift Off

The wall-thinning measurement of ferromagnetic plates covered with insulations and claddings is a main challenge in petrochemical and power generation industries. Pulsed eddy current testing (PECT) is considered as a promising method. However, the accuracy is limited due to the interference factors such as lift-off and cladding. In this study, by decoupling analytic solution, a feature only sensitive to plate thickness is proposed. Based on the electromagnetic waves reflection and transmission theory, cladding-induced interference is firstly decoupled from the analytical model. Moreover, by using the first integral mean value theorem, interferences of insulation and the lift-off are decoupled, too. Hence, the method is proposed by calculating Euclidean distances between the normalized detection signal and normalized reference signal as the feature to assess wall thinning. Its effectiveness under various conditions is examined and results show that the proposed feature is only sensitive to the ferromagnetic plate thickness. Finally, the experiment is carried on to verify this method practicable.

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