Electromagnetic field analysis in remote field eddy current testing systems

1989 ◽  
Vol 25 (4) ◽  
pp. 3010-3012 ◽  
Author(s):  
N. Burais ◽  
A. Nicolas
Keyword(s):  
Electromagnetic Field ◽  
Eddy Current ◽  
Eddy Current Testing ◽  
Field Analysis ◽  
Current Testing

scholarly journals Computation of three-dimensional electromagnetic field in the eddy-current testing of steel pipes

1988 ◽  
Vol 24 (6) ◽  
pp. 3168-3170 ◽  
Author(s):  
H. Tsuboi ◽  
T. Misaki ◽  
T. Kikuta
Keyword(s):  
Electromagnetic Field ◽  
Eddy Current ◽  
Three Dimensional ◽  
Eddy Current Testing ◽  
Steel Pipes ◽  
Current Testing

Crack Sizing of Deep Cracks in Eddy Current Testing Using 3D Electromagnetic Field Analysis

2004 ◽  
Author(s):  
Toshiyuki Takagi ◽  
Tetsuya Uchimoto ◽  
Hisashi Endo
Keyword(s):  
Eddy Current ◽  
Crack Depth ◽  
High Accuracy ◽  
Eddy Current Testing ◽  
Field Analysis ◽  
Current Field ◽  
Metal Structures ◽  
Current Testing ◽  
Crack Sizing ◽  
Exhaustive Study

A computer-aided approach of the eddy current testing (ECT) is described to detect and to size up deep cracks in thick metal structures. A 3D eddy current field analysis based on the finite elements performs designing ECT probes and evaluating the size of crack depth quantitatively. An exhaustive study on the ECT probe specification gives the optimal design of coil elements and their combination. The experimental verification shows that the developed ECT probe employing double exciting coils is capable of detecting crack depth over 10mm from the inspection surfaces. The depth of cracks is quantitatively evaluated from the measured ECT signals with the help of numerical calculation. The results of evaluation profile the crack shapes with fairly high accuracy, supporting our approach.

scholarly journals Surface Eddy Current Probes: Excitation Systems of the Optimal Electromagnetic Field (Review)

2020 ◽  
Vol 11 (2) ◽  
pp. 91-104
Author(s):  
V. Ya. Halchenko ◽  
R. V. Trembovetskaya ◽  
V. V. Tychkov
Keyword(s):  
Electromagnetic Field ◽  
Eddy Current ◽  
Eddy Current Testing ◽  
Optimal Synthesis ◽  
Theoretical Research ◽  
Electromagnetic Excitation ◽  
Excitation Field ◽  
Actual Problem ◽  
Current Testing ◽  
Testing Zone

Development of technical tools with improved metrological and operational characteristics is the actual problem of the eddy current testing. Ensuring the optimal distribution of the electromagnetic excitation field in the testing zone carries out confident detection of the defects and determination of their geometrical parameters by means of eddy current testing. The purpose of the work was to conduct an analysis of scientific and technical information in the field of eddy current testing to study of the use of electromagnetic excitation fields with a priori specified properties, as well as to generalize and systematize the accumulated experience and approaches to conduct theoretical research in this direction.A review of publications in the field of non-destructive electromagnetic testing devoted to the improvement of the excitation systems of eddy current flaw probes was carried out. The authors considered approaches in which a uniform distribution of the electromagnetic field on the control object surface was achieved by linear and non-linear optimal synthesis of excitation systems, provided the immobility of the probe relative to the testing object. Analysis of eddy current probe designs with a homogeneous excitation field created by circular, rectangular tangential and normal coils, as well as by creating a rotational excitation field was carried out. The authors studied designs of the excitation coils of probes with fields of complex configuration characterized by the original fractal geometry which can increase the probability of identifying defects that were not amenable to detection by classical probes.Studies that suggested the formation of optimal configuration fields in a given area using magnetic cores, field concentrators made of conductive materials and specially shaped screens were analyzed. The authors studied approaches to the implementation of the optimal synthesis of excitation systems of probes with uniform sensitivity in the testing zone using surrogate optimization for cases of moving testing objects taking into account the speed effect.The experience, as well as the results of theoretical studies devoted to the problem of designing eddy current probes with uniform sensitivity in the testing zone due to the uniform density distribution of the induced currents flowing in the object were generalized and systematized. As a result, the classification of probes on a number of features that characterize the excitation systems was proposed.

scholarly journals Specifics Of Formation Of Electromagnetic Field By A Crack Of Fatigue Origin At Eddy Current Testing

2016 ◽  
Vol 2016 (3) ◽  
pp. 38-43
Author(s):  
A.Ya. Teterko ◽  
◽  
V.I. Gutnik ◽  
Keyword(s):  
Electromagnetic Field ◽  
Eddy Current ◽  
Eddy Current Testing ◽  
Current Testing

Examination of Gilded Bronze Artifacts Using Nondestructive Eddy Current Techniques

2002 ◽  
Vol 712 ◽  
Author(s):  
Johanna R. Bernstein ◽  
Blythe McCarthy
Keyword(s):  
Electromagnetic Field ◽  
Metal Surface ◽  
Eddy Current ◽  
Eddy Current Testing ◽  
Current Testing

ABSTRACTIn the examination of gilded bronze objects, the analysis of the thickness of the gilding layer, the condition of the substrate and the gilding method is often difficult to manage without taking samples. Yet, the resulting information is vital to research on ancient metalworking and can answer questions of authenticity. The use of nondestructive eddy current techniques can overcome these sampling limitations. Eddy current methods are typically used in the automotive, power and aerospace industries for flaw inspection and alloy selection. In this method, the interaction of an electromagnetic field induced by a coil probe with the metal surface shifts the probe impedance which is measured and correlated to properties of the metal. Results are presented which show that eddy current testing can be used to characterize a gilding layer on a bronze substrate by variations in thickness or composition.

Probabilistic evaluation of detection capability of eddy current testing to inspect pitting on a stainless steel clad using multiple signal features

2020 ◽  
Vol 64 (1-4) ◽  
pp. 47-55
Author(s):  
Takuma Tomizawa ◽  
Haicheng Song ◽  
Noritaka Yusa
Keyword(s):  
Stainless Steel ◽  
Eddy Current ◽  
Pressure Vessels ◽  
Eddy Current Testing ◽  
Probability Of Detection ◽  
Current Testing ◽  
Multiple Signal ◽  
Signal Features ◽  
Inner Surface ◽  
Drill Holes

This study proposes a probability of detection (POD) model to quantitatively evaluate the capability of eddy current testing to detect flaws on the inner surface of pressure vessels cladded by stainless steel and in the presence of high noise level. Welded plate samples with drill holes were prepared to simulate corrosion that typically appears on the inner surface of large-scale pressure vessels. The signals generated by the drill holes and the noise caused by the weld were examined using eddy current testing. A hit/miss-based POD model with multiple flaw parameters and multiple signal features was proposed to analyze the measured signals. It is shown that the proposed model is able to more reasonably characterize the detectability of eddy current signals compared to conventional models that consider a single signal feature.

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