Journal ArticleDOI
Defect classification using a new feature for pulsed eddy current sensors
Gui Yun Tian,Ali Sophian +1 more
TLDR
In this paper, a new feature, termed as the rising point, related to the propagation time of electromagnetic waves in metallic targets is proposed for defect classification, which can be detected and quantified robustly and lift-off can also be derived from the rising time.Abstract:
The objective of this study is to identify defects such as surface cracks, subsurface defects and metal losses using feature based pulsed eddy current sensors. A new feature, termed as the rising point, related to the propagation time of electromagnetic waves in metallic targets is proposed for defect classification. Experimental studies of the validation, robustness of the new feature of rising time are reported. In addition to other features, defects can be detected and quantified robustly and lift-off can also be derived from the rising time. Conclusion and further work are derived on the basis of the findings.read more
Citations
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Journal ArticleDOI
Thickness measurement of non-magnetic plates using multi-frequency eddy current sensors
Wuliang Yin,Anthony Peyton +1 more
TL;DR: In this article, a robust feature in multi-frequency eddy current (MEC) testing has been found that can be directly linked to the thickness of the plate under test, which is shown mathematically that the peak frequency of the imaginary part of the inductance change when an air-cored coil is placed next to a non-magnetic metallic plate is inversely proportional to the surface thickness of a given material.
Journal ArticleDOI
Reduction of lift-off effects for pulsed eddy current NDT
Gui Yun Tian,Ali Sophian +1 more
TL;DR: In this article, an approach using normalization and two reference signals to reduce the lift-off problem with pulsed eddy current NDT testing is proposed, which can be applied for measurement of metal thickness beneath nonconductive coatings, microstructure, strain/stress measurement, where the output is sensitive to the liftoff effect.
Journal ArticleDOI
Pulsed Eddy Current Non-destructive Testing and Evaluation: A Review
TL;DR: Pulsed eddy current (PEC) non-destructive testing and evaluation (NDT&E) has been around for some time and it is still attracting extensive attention from researchers around the globe, which can be witnessed through the reports reviewed in this paper as mentioned in this paper.
Journal ArticleDOI
Steel Corrosion Characterization Using Pulsed Eddy Current Systems
TL;DR: In this paper, a pulsed eddy current (PEC) system has been used to characterize atmospheric corrosion on steel samples, and the relationship between PEC features and exposure time has been derived, which can be useful for corrosion rate measurement and early-stage corrosion evaluation and prediction.
Reduction of lift-off effects for Pulsed Eddy Current NDT
Gui Yun Tian,Ali Sophian +1 more
TL;DR: In this paper, an approach using normalization and two reference signals to reduce the lift-off problem with pulsed eddy current NDT testing is proposed, which can be applied for measurement of metal thickness beneath nonconductive coatings, microstructure, strain/stress measurement, where the output is sensitive to the liftoff effect.
References
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Journal ArticleDOI
A feature extraction technique based on principal component analysis for pulsed eddy current ndt
TL;DR: In this paper, the authors introduced the application of principal component analysis (PCA) in extracting information from PEC responses, which has performed better than the conventional technique in the classification of defects.
Journal ArticleDOI
Design of a pulsed eddy current sensor for detection of defects in aircraft lap-joints
TL;DR: In this article, a new type of pulsed eddy current (PEC) sensor was designed for defect detection in aircraft lap-joint structures, which employs a new excitation circuit that requires no additional signal amplification and also reports compensation techniques that improve the sensing resolution and stability.
Journal Article
Electromagnetic and Eddy Current NDT: A Review
Journal ArticleDOI
Pulsed eddy current signal analysis: application to the experimental detection and characterization of deep flaws in highly conductive materials
TL;DR: In this article, the authors applied pulsed eddy current techniques to specimens containing cracks of different size and depth, and validated this approach by probing different samples with real flaws, using an original signal analysis was developed to extract the characteristics of well known defects.
Journal ArticleDOI
Recent developments in SQUID NDE
TL;DR: A detailed overview of NDE methods using SQUID magnetometers is given in this article, along with a brief summaries of recent application highlights and a comparison of different NDE techniques.