scholarly journals Detection of Subsurface Defects in Steels using Pulsed Eddy Current Thermography

2016 ◽  
Author(s):  
A. Taram ◽  
C. Roquelet ◽  
M. Anderhuber ◽  
P. Meilland ◽  
K. Mouhoubi ◽  
...  
Keyword(s):  
Eddy Current ◽  
Pulsed Eddy Current ◽  
Subsurface Defects

scholarly journals An Improved Feature Parameter Extraction Algorithm of Composite Detection Method Based on the Fusion Theory

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Zhou Ying ◽  
Jin Heli ◽  
Liu Banteng ◽  
Chen Yourong
Keyword(s):  
Eddy Current ◽  
Dispersion Model ◽  
Parameter Extraction ◽  
Quantitative Detection ◽  
Differential Signal ◽  
Feature Parameters ◽  
Pulsed Eddy Current ◽  
Extraction Algorithm ◽  
Feature Parameter ◽  
Subsurface Defects

An improved feature parameter extraction algorithm is proposed in this study to solve the problem of quantitative detection of subsurface defects. Firstly, the common feature parameters from the differential signal of pulsed eddy current and ultrasonic are extracted in time domain and frequency domain. Then, the dispersion model and ReliefF model are established to determine the weights of each parameter. Finally, the weights from the two different algorithms are fused by the D-S evidence theory to determine feature parameters. Compared with the PCA feature parameter algorithm from the pulsed eddy current or ultrasonic, the experiment results show the feature parameters extracted by the algorithm proposed in this paper are more effective in quantitative detection of subsurface defects. It will lead to high accuracy in the subsurface defections.

Scanning induction thermography for subsurface defect orientation detection and depth quantification

2020 ◽  
Vol 64 (1-4) ◽  
pp. 869-877
Author(s):  
Hui Xia ◽  
Erlong Li ◽  
Jianbo Wu ◽  
Qiao Qiu ◽  
Jie Wang ◽  
...  
Keyword(s):  
Eddy Current ◽  
Experimental Studies ◽  
Extraction Methods ◽  
Destructive Testing ◽  
Pulsed Eddy Current ◽  
Subsurface Defect ◽  
New Feature ◽  
Lock In ◽  
Non Destructive ◽  
Subsurface Defects

Pulsed eddy current thermography (PECT) and eddy current lock-in thermography (ECLIT) are non-destructive testing (NDT) techniques of high promising and interest in subsurface defect detection. In the previous researches, the induction coil was set above the defect region and it always parallel to the defect orientation. However, the location and orientation of subsurface defects cannot be determined before detection. Therefore, the scanning induction thermography (SIT) based on dynamic thermography is proposed by some researchers to localize and distinguish the subsurface defects. Still, the main challenges of SIT are how to detect the subsurface defect orientation and quantify the depth. So that, the quantitative analysis in SIT with the new feature extraction methods was investigated and improved to detect the subsurface defect orientation and quantify the defect depth within 5 mm by using experimental studies.

Analysis of field uniformity and quantitative evaluation of subsurface pitting corrosion in conductors via GPEC

2020 ◽  
Vol 64 (1-4) ◽  
pp. 19-29
Author(s):  
Shuting Ren ◽  
Yong Li ◽  
Bei Yan ◽  
Jinhua Hu ◽  
Ilham Mukriz Zainal Abidin ◽  
...  
Keyword(s):  
Quantitative Evaluation ◽  
Eddy Current ◽  
Pitting Corrosion ◽  
Gradient Field ◽  
Uniform Field ◽  
Eddy Current Method ◽  
Optimal Position ◽  
Pulsed Eddy Current ◽  
Field Uniformity ◽  
Processing Algorithms

Structures of nonmagnetic materials are broadly used in engineering fields such as aerospace, energy, etc. Due to corrosive and hostile environments, they are vulnerable to the Subsurface Pitting Corrosion (SPC) leading to structural failure. Therefore, it is imperative to conduct periodical inspection and comprehensive evaluation of SPC using reliable nondestructive evaluation techniques. Extended from the conventional Pulsed eddy current method (PEC), Gradient-field Pulsed Eddy Current technique (GPEC) has been proposed and found to be advantageous over PEC in terms of enhanced inspection sensitivity and accuracy in evaluation and imaging of subsurface defects in nonmagnetic conductors. In this paper two GPEC probes for uniform field excitation are intensively analyzed and compared. Their capabilities in SPC evaluation and imaging are explored through simulations and experiments. The optimal position for deployment of the magnetic field sensor is determined by scrutinizing the field uniformity and inspection sensitivity to SPC based on finite element simulations. After the optimal probe structure is chosen, quantitative evaluation and imaging of SPC are investigated. Signal/image processing algorithms for SPC evaluation are proposed. Through simulations and experiments, it has been found that the T-shaped probe together with the proposed processing algorithms is advantageous and preferable for profile recognition and depth evaluation of SPC.

Real-time wavelet denoising for pulsed eddy current signal based on heterogeneous dual-core

2013 ◽  
Vol 33 (3) ◽  
pp. 866-870
Author(s):  
Xuanbing QIU ◽  
Jilin WEI ◽  
Xiaochao CUI ◽  
Chunhua XIA
Keyword(s):  
Real Time ◽  
Eddy Current ◽  
Wavelet Denoising ◽  
Current Signal ◽  
Pulsed Eddy Current ◽  
Dual Core

Steel Corrosion Characterization Using Pulsed Eddy Current Systems

2012 ◽  
Vol 12 (6) ◽  
pp. 2113-2120 ◽  
Author(s):  
Yunze He ◽  
Guiyun Tian ◽  
Hong Zhang ◽  
Mohammed Alamin ◽  
Anthony Simm ◽  
...  
Keyword(s):  
Eddy Current ◽  
Steel Corrosion ◽  
Pulsed Eddy Current ◽  
Current Systems
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