Low‐frequency perturbation theory in eddy‐current non‐destructive evaluation

1996 ◽  
Vol 80 (7) ◽  
pp. 4090-4100 ◽  
Author(s):  
N. Harfield ◽  
Y. Yoshida ◽  
J. R. Bowler
Keyword(s):  
Perturbation Theory ◽  
Eddy Current ◽  
Low Frequency ◽  
Non Destructive Evaluation ◽  
Non Destructive

Eddy current technique with high temperature SQUID for non-destructive evaluation of non-magnetic metallic structures

Cryogenics ◽  
1996 ◽  
Vol 36 (2) ◽  
pp. 83-86 ◽  
Author(s):  
Y. Tavrin ◽  
H.-J. Krause ◽  
W. Wolf ◽  
V. Glyantsev ◽  
J. Schubert ◽  
...  
Keyword(s):  
High Temperature ◽  
Eddy Current ◽  
Metallic Structures ◽  
Non Destructive Evaluation ◽  
Current Technique ◽  
Non Destructive

Optimum eddy current excitation frequency for subsurface defect detection in SQUID based non-destructive evaluation

2010 ◽  
Vol 43 (8) ◽  
pp. 713-717 ◽  
Author(s):  
R. Nagendran ◽  
N. Thirumurugan ◽  
N. Chinnasamy ◽  
M.P. Janawadkar ◽  
R. Baskaran ◽  
...  
Keyword(s):  
Defect Detection ◽  
Eddy Current ◽  
Excitation Frequency ◽  
Non Destructive Evaluation ◽  
Subsurface Defect ◽  
Non Destructive

High- T c planar SQUID gradiometer for eddy current non-destructive evaluation

2006 ◽  
Vol 15 (8) ◽  
pp. 1903-1908 ◽  
Author(s):  
Zhang Ming-Jian ◽  
Lang Pei-Lin ◽  
Peng Zhi-Hui ◽  
Chen Ying-Fei ◽  
Chen Ke ◽  
...  
Keyword(s):  
Eddy Current ◽  
Non Destructive Evaluation ◽  
Non Destructive

Non-Destructive Evaluation of a Delamination in Laminates by Lamb Wave Propagation

2007 ◽  
Vol 353-358 ◽  
pp. 2345-2348
Author(s):  
Zheng Hua Qian ◽  
Feng Jin ◽  
Zi Kun Wang ◽  
Kikuo Kishimoto
Keyword(s):  
Lamb Waves ◽  
Low Frequency ◽  
Relative Location ◽  
Laminated Plate ◽  
Non Destructive Evaluation ◽  
Symmetric Plane ◽  
Expansion Coefficients ◽  
Relative Errors ◽  
Lamb Wave Propagation ◽  
Non Destructive

The diffraction of Lamb waves by a finite delamination situated on a random plane parallel to the symmetric plane of a laminated plate is taken into account. Two imaginary planes are introduced to solve the problem by adopting the method of mode matching. By taking an appropriate finite number of terms of the infinite expansion series and some selected points on the two imaginary planes through convergence and precision tests, a matrix equation is obtained to evaluate the expansion coefficients numerically. Reflection coefficients versus the normalized length a/h and the relative location h1/h of the delamination are calculated in the low-frequency domain, the relative errors are found to be less than 1%. Results obtained indicate that the theory developed in this paper is meaningful for the detection of both the size and the location of a delamination in a laminated plate by cooperating with experimental techniques for the non-destructive evaluation (NDE) technology.

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