Development of adapted GMR-probes for automated detection of hidden defects in thin steel sheets

Pelkner, Matthias; Pohl, Rainer; Kreutzbruck, Marc; Commandeur, Colin

doi:10.1063/1.4940464

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…In terms of MFL technology, various theories and research provide guidance for practical detection, such as signal mechanisms [9][10][11][12][13], lift-off (LO) effects of probes [14][15][16][17][18], new types of sensors [19], and the magnetization strength of the work piece [20]. The core of the MFL is the sensor, with Hall sensors, anisotropic magneto resistance (AMR), giant magneto resistance [21] (GMR), tunneling magnetoresistance (TMR) [8]. Acoustically stimulated electromagnetic [22] and thin film magnetic [23,24] are two new types of sensors that are not widely used.…”

Section: Introductionmentioning

confidence: 99%

A high-precision TMR sensor array system for detecting surface and internal defects in thin sheet of steel

Feng,

Teng,

Zhao

et al. 2024

Meas. Sci. Technol.

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The online detection of small defects within thin steel holds significant importance in the field of steel manufacturing. This paper presents a high-precision flux leakage measurement system based on TMR sensors for detecting tiny defects in thin steel. We optimized the probe size and magnetic circuit design through numerical simulations and used the developed instrument to detect a standard mimicking through-hole defect plate, achieving a high signalto-noise ratio and successfully detecting artificial defects small to a diameter of 50 µm.Additionally, we detected an actual internal defect in thin steel provided by the steel plant, meeting the required industrial accuracy. The data acquisition process in this study has been optimized to achieve real-time display and defect localization. The measurement scheme proposed in this paper has great potential for online monitoring of the thin steel production process.

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Section: Introductionmentioning

confidence: 99%

A high-precision TMR sensor array system for detecting surface and internal defects in thin sheet of steel

Feng,

Teng,

Zhao

et al. 2024

Meas. Sci. Technol.

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“…This discovery won them a Nobel prize in 2007. The ability to convert magnetic signal into an electrical one has caused the successful realization of magnetic field sensors for a large variety of applications including: hard disk drives, current sensing, magnetic random access memory, position sensing, pressure measurement, and magnetic biosensors [2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Recent advances in magnetoresistance biosensors: a short review

Dey

Yari

2023

Nano Futures

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Recent years have seen the development of spintronic devices and their applications in biomedical areas. Spintronic devices rely on detecting or manipulating a magnetic field, a field to which biological matter is relatively transparent. The recent use of spintronic devices in biomedical areas has included diagnosing diseases such as cancer and cirrhosis, genotyping DNA, point-of-care devices, and flexible electronics. Up to date, most of the spintronic devices in biomedical applications fall into three mainstream types: anisotropic, giant, and tunneling magnetoresistance devices. Each of these has its advantages and drawbacks, which this review explores and discusses. The advent of spintronics gives us a new low-power, low-cost, ease-of-manufacture alternative to standard CMOS sensors. The sensitivity of spintronic biosensors has been progressing steadily, expected to increase tremendously in the next few years.

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“…A Hall sensor array was used to analyze the gas pipeline and feasible results were obtained. Pelkner et al [32] analyzed the flex leakage from thin steel sheets with a thickness of 0.3 mm by using the MFL method. From the surface of the steel sheet, small-size defects were clearly measured with a good SNR.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Leakage in a Sustainable Water Pipeline Based on a Magnetic Flux Leakage Technique

et al. 2022

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Pipelines are typically used to transport oil, natural gas, water, etc. It is one of the most effective methods for transferring fluids over long distances. However, long-term usage of these pipes without maintenance results in the formation of residues, which will pave the way for pipeline accidents and soil contamination. To ensure the safety and protection of resources, these sustainable pipelines need to be inspected to avoid losses. This work aims to investigate various internal defect leaks in the non-uniform thickness of sustainable water pipes that are joined with a pipe expander. The magnetic flux leakage technique was implemented to evaluate these defects by means of a flexible GMR sensor array. An inspection robot containing two units was fabricated with the aid of 3D printing. The power unit provides the necessary thrust to actuate the entire robot whereas the sensing unit is responsible for analyzing the leaks. The robot’s movement is predicted by the MPU6050 and ultrasonic distance sensors that are plotted as motion plots. The sensing unit consists of permanent magnets and a giant magnetoresistance (GMR) array to interrogate the flux leakage in the defect region. The flux leakage from the defects was stored with the help of an Arduino microcontroller, which controls the overall process. In addition, the spring suspension is provided to regulate the motion of the robot. The flux leakage from the defect region was plotted as waveform graphs. Thus, the results are effectively presented and compared. The calculated signal-to-noise ratio (SNR) of the magnetic flux leakages (MFLs) for 4.5 mm-thick pipe defects was 12 to 20.8 dB, and for 6.52 mm-thick pipe defects, it was 9.5 to 19 dB. In sum, the MFL technique provides a reliable method for the sustainable development of water supply to wide areas.

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Development of adapted GMR-probes for automated detection of hidden defects in thin steel sheets

Cited by 7 publications

References 11 publications

A high-precision TMR sensor array system for detecting surface and internal defects in thin sheet of steel

A high-precision TMR sensor array system for detecting surface and internal defects in thin sheet of steel

Recent advances in magnetoresistance biosensors: a short review

Analysis of Leakage in a Sustainable Water Pipeline Based on a Magnetic Flux Leakage Technique

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