Development of a Bidirectional-Excitation Eddy-Current Sensor With Magnetic Shielding: Detection of Subsurface Defects in Stainless Steel

Liu, Zenghua; Yao, Jiufu; He, Cunfu; Li, Ziming; Liu, Xiucheng; Wu, Bin

doi:10.1109/jsen.2018.2844957

Cited by 24 publications

(8 citation statements)

References 24 publications

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“…So, the solution of the problem of reducing the interaction zone of the ECP field with the product and reducing the magnetic fluxes of scattering [10] increased the noise immunity and selectivity. The creation of an EMF with a predetermined distribution topology improved the selectivity and sensitivity of ECP [1][2][3][4][5][6][7][8][9][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Moreover, the improvement of both parts of the ECP, namely, the ES and the field detector, allowed achieving the desired results.…”

Section: The Solution Of the Problemmentioning

confidence: 99%

“…Despite the advantages of such planar ECP, the problem of creating a uniform distribution of ECD remains unresolved. A different approach to the formation of the EMF of the optimal configuration in a given zone was used in [11,14], where magnetic cores, field concentrators made of conductive materials, and screens of a special shape with and without "masks" are used. For example, a sensor with magnetization device was proposed in [14].…”

Section: The Solution Of the Problemmentioning

confidence: 99%

“…The sensor has an electromagnet with U-shaped core and a combination of a tangential rectangular detector coil for measuring the magnetic flux density Bx and a flat rectangular coil for measuring the magnetic flux density Bz (Figure 23). Sensors of this type [11,14] are effective in detecting defects in TO of complex shape and limited sizes, in monitoring which, the effect of the edge of the object on the signals of the ECP is especially felt. For screened ECPs, when shielding elements are placed on the ends of the feedthrough probes, in addition to the positive effect, a negative one also arises, such as an increase in field inhomogeneity in the control zone.…”

Section: The Solution Of the Problemmentioning

confidence: 99%

See 2 more Smart Citations

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

Гальченко¹,

Трембовецкая²,

Tychkov³

2020

Prib. metody izmer.

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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.

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Section: The Solution Of the Problemmentioning

confidence: 99%

Section: The Solution Of the Problemmentioning

confidence: 99%

Section: The Solution Of the Problemmentioning

confidence: 99%

See 1 more Smart Citation

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

Гальченко¹,

Трембовецкая²,

Tychkov³

2020

Prib. metody izmer.

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“…ZH. Liu et al applied double excitation on magnetic shielding to detect sub-surface defects for stainless steel [40]. Y.…”

Section: Introductionmentioning

confidence: 99%

Multi-Layer Magnetic Focusing Sensor Structure for Pulsed Remote Field Eddy Current

Yang

Gao

et al. 2019

IEEE Sensors J.

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Pulsed Remote field eddy current (PRFEC) technique has been utilized broadly in detection of tubular material because of its abundant frequency spectrums with lower power consumption. A novel multi-layer magnetic focusing sensor structure is proposed for PRFEC. The new sensing structure consists of several promising characteristics. It significantly enhances the detectability of the deeper depth of ferromagnetic material, and provides detection capability without covering U type component. Both driver and receiver coil are integrated in the same sensing structure while the traditional methods are put them separated. The theoretical derivation based on electromagnetic principles has been developed for analyzing and interpreting the results. In addition, number of experiments and simulations on different defects have been studied. In experiments, both surface and subsurface defects with different width, depth, inclined angle and circular type have been carried out. The results have confirmed that all types of defects can be detected and it has shown the relatively preferable linear relationships and reliabilities.

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“…Створення однорідного поля збудження, що сприяє впевненому виявленню дефектів і визначенню їх геометричних параметрів засобами вихрострумового контролю, є актуальною та водночас складною проблемою. Широкий загал науковців досліджує вихрострумові перетворювачі, які мають електромагнітне поле (ЕМП) із заздалегідь визначеною топологією, що дає змогу покращити їх селективність і чутливість [1][2][3]. Детальний огляд науково-технічної інформації щодо використання ЕМП збудження із наперед заданими властивостями наведено в роботі [4], де розглянуто низку робіт, в яких висвітлено результати досліджень, коли лінійним або нелінійним синтезом досягається однорідний розподіл ЕМП на поверхні нерухомого об'єкта контролю (ОК).…”

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Лінійний Сурогатний Синтез Рамкових Тангенціальних Вихрострумових Перетворювачів З Об’ємною Структурою Системи Збудження

2021

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Запропоновано математичний метод лінійного сурогатного параметричного синтезу рухомих рамкових тангенціальних накладних вихрострумових перетворювачів з однорідним розподілом густини вихрових струмів у зоні контролю об’єкта. Побудовано метамодель рамкового вихрострумового перетворювача з об’ємною структурою системи збудження. Прийнятну точність створеної метамоделі отримано шляхом застосування асоціативних нейронних мереж із методами підвищення точності та декомпозиції простору пошуку. Наведено чисельні результати і графічний матеріал, який ілюструє адекватність та інформативність отриманої метамоделі. Розглянуто приклади синтезу систем збудження із використанням сучасних метаевристичних стохастичних алгоритмів пошуку глобального екстремуму. Наведено чисельні результати отриманого розв’язку і графічний ілюстративний матеріал розподілу густини вихрових струмів на поверхні в зоні контролю об’єкта.

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Development of a Bidirectional-Excitation Eddy-Current Sensor With Magnetic Shielding: Detection of Subsurface Defects in Stainless Steel

Cited by 24 publications

References 24 publications

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

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

Multi-Layer Magnetic Focusing Sensor Structure for Pulsed Remote Field Eddy Current

Лінійний Сурогатний Синтез Рамкових Тангенціальних Вихрострумових Перетворювачів З Об’ємною Структурою Системи Збудження

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