Nondestructive Testing of Train Wheels Using Vertical Magnetization and Differential-Type Hall-Sensor Array

Lee, Jinyi; Choi, Myoungki; Jun, Jongwoo; Kwon, Seok-Jin; Kim, Do Kyung; Kim, Jungmin; Le, Minhhuy

doi:10.1109/tim.2012.2199190

Cited by 15 publications

(5 citation statements)

References 12 publications

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“…This limitation can be improved by implementing a more sophisticated magnetic sensor and amplifying algorithm on the system. Figure 6 shows the inspection image of the MOE and magnetic camera [14].…”

Section: Configuration Of the Magnetic Sensormentioning

confidence: 99%

“…Magnetic camera provides real-time visualization of the distribution of LMFD using integrated signal processing consisting of magnetic source, sensor array, magnetic lens, signal processing, and user interface for the inspection display [10]- [13]. Magnetic camera can extend the measurement area up to 3 meters on one cycle which is very beneficial for actual industrial inspections [14]. The MOE and magnetic camera approach are excellent for inspecting the distribution of 2D static LMFD.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Magneto-Optical Faraday Effect Method and Magnetic Camera for Imaging the 2-D Static Leakage Magnetic Flux Density

Dharmawan¹,

Lee²,

Wang³

2022

eJNDT

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Magnetic flux leaks around the defect on the magnetized ferromagnetic specimen. The magnetic flux leakage testing (MFLT) use the magnetic sensor to measure the leaked magnetic flux density (LMFD). The high sensitivity of sensor need to increase the probability of detection (POD). Also the small size and high spatial resolution of sensor need to increase POD and to sizing defect. Uniform and small lift-off are another necessary to increase POD and sizing ability. Also, the real time imaging of magnetic flux density can increase the inspection time. So the period of planned preventive maintenance could reduce. Two dimensional semiconductor-based magnetic sensor array with high spatial resolution satisfies these requirements. Projection of magnetic flux density on a sensor itself would be another method. We compare the magnetic camera and the magneto-optical Faraday effect (MOE) for MFLT. Magnetic camera uses the two dimensional Hall sensor arrays to imaging the LMFD. And the MOE project LMFD. The plane of polarized light rotates inside of magneto-optical film (MOF). The Faraday rotation angle proportional to direction and intensity of magnetic flux density. Sensitivity, spatial resolution, magnetic hysteresis, repeatability, full-scaled operational range compared. Also shape of target specimen compares too.

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Section: Configuration Of the Magnetic Sensormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of Magneto-Optical Faraday Effect Method and Magnetic Camera for Imaging the 2-D Static Leakage Magnetic Flux Density

Dharmawan¹,

Lee²,

Wang³

2022

eJNDT

View full text Add to dashboard Cite

show abstract

“…The resultant magnetic field distribution images were instrumental in examining the interference of stray magnetic fields from electronic devices on medical equipment, thereby assessing potential risks. Jinyi Lee and team [ 6 , 7 ] devised a magnetic imaging device with a linear array of 64 InSb Hall sensors, suitable for identifying wear and fissures in train wheels. J.Z.…”

Section: Introductionmentioning

confidence: 99%

An Advanced Hall Element Array-Based Device for High-Resolution Magnetic Field Mapping

Zhou,

Cai,

Zhu

2024

Sensors

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The precise mapping of magnetic fields emitted by various objects holds critical importance in the fabrication of industrial products. To meet this requirement, this study introduces an advanced magnetic detection device boasting high spatial resolution. The device’s sensor, an array comprising 256 unpackaged gallium arsenide (GaAs) Hall elements arranged in a 16 × 16 matrix, spans an effective area of 19.2 mm × 19.2 mm. The design maintains a 1.2 mm separation between adjacent elements. For enhanced resolution, the probe scans the sample via a motorized rail system capable of executing specialized movement patterns. A support structure incorporated into the probe minimizes the measurement distance to below 0.5 mm, thereby amplifying the magnetic signal and mitigating errors from nonparallel probe–sample alignment. The accompanying interactive software utilizes cubic spline interpolation to transform magnetic readings into detailed two- and three-dimensional magnetic field distribution maps, signifying field strength and polarity through variations in color intensity and amplitude sign. The device’s efficacy in accurately mapping surface magnetic field distributions of magnetic and magnetized materials was corroborated through tests on three distinct samples: a neodymium–iron–boron magnet, the circular magnetic array from a smartphone, and a magnetized 430 steel plate. These tests, focused on imaging quality and magnetic field characterization, underscore the device’s proficiency in nondestructive magnetic field analysis.

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“…Wang et al uses a nonlinear calibration magnetoresistive sensor method to solve the problem of buried depth defects [22]. However, high-precision sensors have a small linear range and are prone to saturation [23,24]. The high magnetization required for the detection of thick walled steel pipes results in a strong background magnetic field, which makes it impossible for high sensitivity sensors to detect in a strong background.…”

Section: Introductionmentioning

confidence: 99%

Optimal design of iron-cored coil sensor in magnetic flux leakage detection of thick-walled steel pipe

Wang¹,

Yu²,

Tang³

et al. 2023

Meas. Sci. Technol.

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Thick-walled steel pipes, which bear high internal pressure, are widely applied in nuclear power and pressure pipelines. If there are defects in the inner wall, they are easy to expand and cause accidents. Therefore, the thick-walled steel pipe must be subject to non destructive-testing after production. For the magnetic flux leakage (MFL) testing method, the detection sensitivity gradually decreases with the increase of wall thickness. To solve this problem, a new structure of MFL probe is proposed in this paper. The influence of the iron core permeability on the MFL signal is analyzed theoretically, and the effect of the core length and diameter on the MFL signal is analyzed by simulation. The variation of the MFL signal with the change of the iron core and coil lift-off is studied respectively. The simulation results are verified by experiments. It is found that the lift-off of the iron-cored coil is determined by the iron core position. Based on this phenomenon, an MFL array probe is designed, which can be used for online detection of thick-walled steel pipes to improve the detection sensitivity of inner wall defects.

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Nondestructive Testing of Train Wheels Using Vertical Magnetization and Differential-Type Hall-Sensor Array

Cited by 15 publications

References 12 publications

Comparison of Magneto-Optical Faraday Effect Method and Magnetic Camera for Imaging the 2-D Static Leakage Magnetic Flux Density

Comparison of Magneto-Optical Faraday Effect Method and Magnetic Camera for Imaging the 2-D Static Leakage Magnetic Flux Density

An Advanced Hall Element Array-Based Device for High-Resolution Magnetic Field Mapping

Optimal design of iron-cored coil sensor in magnetic flux leakage detection of thick-walled steel pipe

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