Nondestructive testing and crack evaluation of ferromagnetic material by using the linearly integrated hall sensor array

Lee, Jinyi; Hwang, Jiseong; Jun, Jongwoo; Choi, Seho

doi:10.1007/s12206-008-0908-5

Cited by 34 publications

(8 citation statements)

References 5 publications

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“…In this study, an MFL sensor was applied to detect the local fault (LF) damage of steel cables, by capturing the magnetic flux leakage. The magnetic flux leakage method is most suitable for continuous structures that have constant cross-sections, such as cables and pipes, and has been applied for the inspection of steel cables in the mining industry, for ski lifts, elevators, and for other applications [10][11][12][13][14][15]. However, most MFL devices are fixed systems, which cannot be used for steel cables in bridges.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Flux Leakage Sensing-Based Steel Cable NDE Technique

Park

Kim

Lee

et al. 2014

Shock and Vibration

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Nondestructive evaluation (NDE) of steel cables in long span bridges is necessary to prevent structural failure. Thus, an automated cable monitoring system is proposed that uses a suitable NDE technique and a cable-climbing robot. A magnetic flux leakage- (MFL-) based inspection system was applied to monitor the condition of cables. This inspection system measures magnetic flux to detect the local faults (LF) of steel cable. To verify the feasibility of the proposed damage detection technique, an 8-channel MFL sensor head prototype was designed and fabricated. A steel cable bunch specimen with several types of damage was fabricated and scanned by the MFL sensor head to measure the magnetic flux density of the specimen. To interpret the condition of the steel cable, magnetic flux signals were used to determine the locations of the flaws and the levels of damage. Measured signals from the damaged specimen were compared with thresholds that were set for objective decision-making. In addition, the measured magnetic flux signals were visualized as a 3D MFL map for intuitive cable monitoring. Finally, the results were compared with information on actual inflicted damages, to confirm the accuracy and effectiveness of the proposed cable monitoring method.

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Section: Introductionmentioning

confidence: 99%

Magnetic Flux Leakage Sensing-Based Steel Cable NDE Technique

Park

Kim

Lee

et al. 2014

Shock and Vibration

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“…However, the sensor likely more sensitive than Anisotropic Magneto Resistor (AMR) due to the design known to have a sensitive axis and nonsensitive axis orthogonally [55]. In the experiment, Helmholtz coil [56] is used by positioning the sensor in the centre of the coil in order to maintain a homogenous magnetic field before the defect properties can be acquired. In order to measure the magnetic flux density on the x-axis between the Helmholtz coil, Biot-Savart´s law [57,58] is used to determine the potential of uncertainty in normal flux distribution.…”

Section: Magnetoresistance (Mr) Sensormentioning

confidence: 99%

Theory and development of magnetic flux leakage sensor for flaws detection: A review

Sharif¹,

Ramli²,

Mohamed³

et al. 2019

IJAAS

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<p>This paper presents a review of state-of-art in the Magnetic Flux Leakage (MFL) sensor technology, which plays an important role in Nondestructive Testing (NDT) to detect crack and corrosion in ferromagnetic material. The demand of more reliable MFL tools and signal acquisition increase as it has a direct impact on structure integrity and can lead to be major catastrophic upon questionable signal analysis. This is because the size, cost, efficiency, and reliability of the extensive MFL system for NDT applications primarily depend on signal acquisition as a qualitative measure in producing a trustworthy analysis. Therefore, the selection of appropriate tools and methodology plays a major role in determining the comprehensive performance of the system. This paper also reviews an Artificial Neural Network (ANN) and Finite Element Method (FEM) in developing an optimum permeability standard on the test piece. </p>

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“…In these applications, the material is magnetically saturated by means of permanentor electromagnets and the lack of homogeneity results in the phenomenon of magnetic flux leakage (MFL) [3,4]. In recent years, the progress in the fabrication of integrated magnetic field sensors (Hall probes, magneto-resistive probes, etc) triggered the realization of NDT tools exploiting contextually MFL and sensor arrays to produce imaging systems suitable for the effective in-service monitoring of oil and gas steel pipelines [5][6][7][8]. At the same time, the high magnetic field sensitivity provided by semiconductor field sensors, and the contextual use of advanced signal and IP algorithms, have made possible the development of passive MFL-based technique particularly suited for the detection and localization of plastic deformation and residual mechanical stress in ferromagnetic steels [9,10].…”

Section: Apparatusmentioning

confidence: 99%

Magnetic imaging and machine vision NDT for the on-line inspection of stainless steel strips

Ricci

Ficola

Fravolini

et al. 2012

Meas. Sci. Technol.

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An on-line inspection system for stainless steel strips has been developed on an annealing and pickling line at the Acciai Speciali Terni S.p.A. steel mill. Besides a machine vision apparatus, the system contextually exploits a magnetic imaging system designed and realized for the specific application. The main goal of the research is represented by the fusion of the information provided by the two apparatuses that can improve the detection and classification tasks by enlarging the set of detectable defects. In this paper, the development, the calibration and the characteristics of the magnetic imaging apparatus are detailed and experimental results obtained both in laboratory and in situ are reported. A comparative analysis of the performances of the two devices is also reported based on preliminary results and some conclusions and perspectives are drawn.

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Nondestructive testing and crack evaluation of ferromagnetic material by using the linearly integrated hall sensor array

Cited by 34 publications

References 5 publications

Magnetic Flux Leakage Sensing-Based Steel Cable NDE Technique

Magnetic Flux Leakage Sensing-Based Steel Cable NDE Technique

Theory and development of magnetic flux leakage sensor for flaws detection: A review

Magnetic imaging and machine vision NDT for the on-line inspection of stainless steel strips

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