Eddy-current testing

About: Eddy-current testing is a research topic. Over the lifetime, 3010 publications have been published within this topic receiving 28472 citations.

Non-Destructive Techniques Based on Eddy Current Testing

Abstract: Non-destructive techniques are used widely in the metal industry in order to control the quality of materials. Eddy current testing is one of the most extensively used non-destructive techniques for inspecting electrically conductive materials at very high speeds that does not require any contact between the test piece and the sensor. This paper includes an overview of the fundamentals and main variables of eddy current testing. It also describes the state-of-the-art sensors and modern techniques such as multi-frequency and pulsed systems. Recent advances in complex models towards solving crack-sensor interaction, developments in instrumentation due to advances in electronic devices, and the evolution of data processing suggest that eddy current testing systems will be increasingly used in the future.

Handbook of Nondestructive Evaluation

Abstract: Chapter 1: Introduction to Nondestructive Testing Chapter 2: Dicontinuities - Origins and Classification Chapter 3: Visual Testing Chapter 4: Penetrant Testing Chapter 5: Magnetic Particle Testing Chapter 6: Radiographic Testing New - Digital Radiography Chapter 7: Ultrasonic Testing New - Phased Array Ultrasonics New - Guided Wave Ultrasonics Chapter 8: Eddy current Testing Chapter 9: Thermal Infrared Testing Chapter 10: Acoustic Emission Testing

Review of Advances in Quantitative Eddy Current Nondestructive Evaluation

Abstract: A comprehensive review of advancements in eddy current (EC) modeling is presented. This paper contains three main sections: a general treatise of EC theory, the thin skin EC forward modeling, and the EC inverse problem. (1) The general treatise of eddy current theory begins with an exposition of the reciprocity formulas for evaluating probe impedance changes, which are derivable from first principles. Two versions of the reciprocity formulas, one with a surface integral and the other with a volume integral, are given. Any particular type of defect, as well as both one-port and two-port probes, can be treated. Second, a brief account of analytical and numerical methods for calculating the field distributions is presented. Third, theory of probe/material interactions with various defect types is described. (2) The paper then proceeds to the forward modeling section, which contains a detailed treatment of the eddy current forward problem for surface breaking cracks and EDM notches in the thin skin approximation. (3) The inverse problem section begins with a general review of commonly used inversion methods, exemplified by selected references from the literature, followed by more detailed examinations of EC inversions for surface breaking cracks and slots. The last part of this section is devoted to the inverse problem for layered structures. Although being a review in nature, the paper contains a number of new accounts for time-domain eddy current interactions. In particular, a modification is proposed to the reciprocity formula in order to take a better account of pulsed eddy current signals.

A feature extraction technique based on principal component analysis for pulsed eddy current ndt

Abstract: Pulsed Eddy current (PEC) is a new emerging NDT technique for sub-surface defect detection. The technique mainly uses the response peak value and arrival to detect and quantify the defects. This could suffer from noise and be not sufficient to extract more information about the defects, e.g. depth information of defects. This paper introduces the application of principal component analysis in extracting information from PEC responses. A comparative test carried out shows that the introduced technique has performed better than the conventional technique in the classification of defects.

Electrical and Magnetic Methods of Nondestructive Testing

Abstract: Preface. Introduction. Fundamental theory. Magnetic methods. Eddy current principles. Eddy current methods. More advanced eddy current testing methods. Microwave methods. Miscellaneous methods. Appendix. References. Index.