Eddy-Current Modeling of Ferrite-Cored Probes

Buvat, Fabrice

doi:10.1063/1.1916712

Cited by 9 publications

(5 citation statements)

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“…The conditions needed for proposed coefficient investigation and the invariant properties of EC efficiency coefficient ξ for air-core coils in relation to coil diameter and the number of turns were shown [18][19]. This methodology based on the volume integral code (VIC-3D code [20]) calculations was successfully applied to optimize the ferrite core EC probe design in contrast to other experimental or simulation methods [14][15][16]20].…”

Section: Selection Of Ferrite Core Parameters For Single-coil Ec Probesmentioning

confidence: 99%

Enhanced Eddy Current Techniques for Detection of Surface-Breaking Cracks in Aircraft Structures

Uchanin

2021

Transactions on Aerospace Research

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Well-timed detection of the defects (e.g., fatigue cracks and corrosive damages) in aircraft structures is the question of vital importance. Periodic in-service non-destructive inspection (NDI) is necessary to prevent expensive aircraft breakdowns during in-service life. Eddy current (EC) NDI method have many advantages for in-service aircraft inspection due to high mobility and the possibility to detect fatigue cracks without direct contact with the inspected surface (even through a protective coating without removal). Last decades some enhanced EC techniques were developed for aircraft in-service inspection in the Karpenko Physico-Mechanical Institute of National Academy of Sciences (Lviv) in collaboration with Ukrainian and foreign aircraft companies. Proposed earlier EC efficiency coefficient was applied for the selection of the ferrite-core EC probe parameters. Investigations concerned with the crack detectability for single-coil EC probes of different sizes were carried out to improve the inspection procedures. The sensitivity of the developed single-coil EC probe was experimentally investigated. The possibility to distinguish the signals associated with detected defect and lift-off was shown. The new inspection procedure was proposed for full suppression of the noise concerned with the rivet edge influence. The high-frequency EC flaw detector of Leotest VD 3.03 type based on self-generator mode and miniature single-coil EC probes application was developed for detection of the surface-breaking fatigue cracks. The original scheme of double-circuit self-generator with intermittent oscillations was invented and investigated. The pulse-repetition frequency of high-frequency oscillations was used as an informative parameter. The important feature of the developed self-generating scheme is the effective suppression of the lift-off influence (the changes of the clearance between the EC probe and the inspected object surface during the scanning). Developed EC flaw detectors of Leotest VD 3.03 type and inspection procedures were successfully implemented into the maintenance practice for detection of the fatigue cracks initiated in the wing and the fuselage structures and aviation engines in many companies such as ANTONOV AIRCRAFT, Lviv State Aircraft Repair Plant, Konotop aircraft repair plant «AVIAKON», Ukrainian International Airlines, MOTOR-SICH, State Enterprise “IVCHENKO-PROGRESS”, etc.

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Section: Selection Of Ferrite Core Parameters For Single-coil Ec Probesmentioning

confidence: 99%

Enhanced Eddy Current Techniques for Detection of Surface-Breaking Cracks in Aircraft Structures

Uchanin

2021

Transactions on Aerospace Research

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“…where Ēinc is the incident electric fields on the crack from the coil and the Ferrite structure, and Jind is the induced Eddy current on the crack due to the change of the material within the conductive media [6]. Eq.…”

Section: Physical Background and Data Simulationmentioning

confidence: 99%

Learning to Reconstruct Crack Profiles for Eddy Current Nondestructive Testing

Li,

Anees,

Zhong

et al. 2019

Preprint

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Eddy current testing (ECT) is one of the most popular Nondestructive Testing (NDT) techniques, especially for conductive materials. Reconstructing the crack profile from measured EC signals is one of the main goals of ECT. This task is highly challenging, as the EC signals are nonlinear responses resulted from the presence of cracks, and reconstructing the crack profile requires establishing the forward model of the nonlinear electromagnetic dynamics and solving its inverse problem, which is an ill-posed numerical optimization problem. Instead of solving the inverse problem numerically, we propose to directly learn the inverse mapping from EC signals to crack profiles with a deep encoder-decoder convolutional neural network named EddyNet. EddyNet is trained on a set of randomly generated crack profiles and the corresponding simulated EC responses generated from a realistic forward model. On the held-out test data, EddyNet achieved a mean absolute error of 0.198 between predicted profiles and ground truth ones. Qualitatively, the geometries of predicted profiles are visually similar to the ground truth profiles. Our method greatly reduces the usual reliance on domain experts, and the reconstruction is extremely fast both on GPUs and on CPUs. The source code of EddyNet is released on https://github.com/askerlee/EddyNet.

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“…There exists three common methods used for eddy current probe design: experimental method, analytical method and numerical method.The analytical method is based on the electromagnetic theory, by analyzing the impedance of the coil, we thus determine the specific parameter for coil configuration [4] . Taking some experiments for example, the eddy current sensor with ferrite core coil impedance theory model and numerical calculation made by BuvatF [5] . When it comes to the numerical method, it is based on the rapid developing computer science, which use the numerical modeling to solve the numerical solution of the coil response so as to realize the simulation of performance of eddy current probe [6] .…”

Section: Eddy Detector Designmentioning

confidence: 99%

Eddy Current Probe Parameters Optimization Design Based on Orthogonal Experiment

Liang

Yun

et al. 2015

AMM

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A new type of eddy detector structure is designed for measuring the parameters of the thickness of hollow blade engines. To solve the following problems: small-diameter coil, large range of measurement and selective sensitivity testing on two different material.The multi-target orthogonal experiment method is adapted to analyze main configuration parameters which affect sensor performance. The importance order of the effect on the measurement results by various factors is determined according to analysis of experimental data, the optimal parameters configuration is found out.The optimization results show that the best parameters combination is as follows:the frequency of 1750Hz,the number of turns are 150 turns, the diameter of coil is 5 mm, the diameter section for the magnetic cores is 4mm×4mm.By using the effective and feasible method, the test result have proved good enough experiment results of the new kind of eddy detector.

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Eddy-Current Modeling of Ferrite-Cored Probes

Cited by 9 publications

References 0 publications

Enhanced Eddy Current Techniques for Detection of Surface-Breaking Cracks in Aircraft Structures

Enhanced Eddy Current Techniques for Detection of Surface-Breaking Cracks in Aircraft Structures

Learning to Reconstruct Crack Profiles for Eddy Current Nondestructive Testing

Eddy Current Probe Parameters Optimization Design Based on Orthogonal Experiment

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