Inversion Method in Pulsed Eddy Current Testing for Wall Thickness of Ferromagnetic Pipes

2020 ◽  
Vol 69 (12) ◽  
pp. 9766-9773
Author(s):  
Xingle Chen ◽  
Jingwen Li ◽  
Zhaohui Wang
Keyword(s):  
Wall Thickness ◽  
Eddy Current ◽  
Eddy Current Testing ◽  
Inversion Method ◽  
Current Testing ◽  
Pulsed Eddy Current

Thickness measurement for non-ferromagnetic metal under the large liftoff based on the last peak point of differential pulsed eddy current signals

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1119-1126
Author(s):  
Yun Song ◽  
Xinjun Wu
Keyword(s):  
Measurement Error ◽  
Wall Thickness ◽  
Eddy Current ◽  
Thickness Measurement ◽  
Eddy Current Testing ◽  
Metallic Component ◽  
Current Testing ◽  
Pulsed Eddy Current ◽  
Peak Point ◽  
Acceptable Range

Pulsed Eddy Current Testing (PECT) has been used to measure the wall thickness of ferromagnetic metallic component with thick insulation. However, for the non-ferromagnetic metallic component, there is still the problem to be solved. The main purpose of this study is to find an effective feature, to measure wall thinning of the non-ferromagnetic metallic component under the large liftoff, and further expand application of the PECT technology. Hence, the time to the last peak point (TLPP) is proposed based on the analytical predicted signals. Furthermore, the influence of the variable liftoff is studied, and the error caused by the liftoff is within the acceptable range. Two sets of experiments are conducted to test the performance of the TLPP under various liftoffs. The results show that when the wall thickness is reduced by more than 40%, the measurement error based on the TLPP is within 11%.

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
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