Evaluation of stress loaded steel samples using GMR magnetic field sensor

Chady, Tomasz

doi:10.1109/jsen.2002.804574

Cited by 16 publications

(15 citation statements)

References 5 publications

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“…The feasibility of utilizing MR sensors in NDEM was first tested by several groups in 2002. The MR-sensor-based NDEM of subsurface mechanical and chemical damages in metallic or magnetic components was introduced, especially, to investigate the components used in high-standard products (e.g., aircrafts) [102][103][104]. A GMR-based inspection probe was developed to detect the subsurface fatigue cracks and holes under airframe fasteners [104].…”

Section: Non-destructive Evaluation and Monitoring (Ndem)mentioning

confidence: 99%

“…The functionality of the developed probe was studied by both finite-element-method simulation and experiment. In the same year, a GMR-based gradiometer was introduced to measure the tensile stress of the SS400 steels [102]. Ray Rempt from the Boeing company also proposed an 8-element MR scanner for inspecting the subsurface corrosion of the airframe [103].…”

Section: Non-destructive Evaluation and Monitoring (Ndem)mentioning

confidence: 99%

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Magnetoresistive Sensor Development Roadmap (Non-Recording Applications)

et al. 2019

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Magnetoresistive (MR) sensors have been identified as promising candidates for the development of high-performance magnetometers due to their high sensitivity, low cost, low power consumption, and small size. The rapid advance of MR sensor technology has opened up a variety of MR sensor applications. These applications are in different areas that require MR sensors with different properties. Future MR sensor development in each of these areas requires an overview and a strategic guide. A MR sensor roadmap (non-recording applications) was therefore developed and made public by the Technical Committee of The IEEE Magnetics Society with the aim to provide an R&D guide for MR sensors intended to be used by industry, government, and academia. The roadmap was developed over a three-year period and coordinated by an international effort of 22 taskforce members from 10 countries and 17 organizations, including universities, research institutes, and sensor companies. In this paper, the current status of MR sensors for non-recording

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Section: Non-destructive Evaluation and Monitoring (Ndem)mentioning

confidence: 99%

Section: Non-destructive Evaluation and Monitoring (Ndem)mentioning

confidence: 99%

Magnetoresistive Sensor Development Roadmap (Non-Recording Applications)

et al. 2019

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“…Some typical NDT applications based on magneto resistive sensors are: measuring residual stress in ferromagnetic materials [1], detection of cracks and inclusions inside steel sheets [2] and inspection of bore holes in aluminum [3]. For all of these magnetic imaging tasks sensitivity is crucial, but the spatial resolution attainable is often a critical parameter, too [4].…”

Section: Introductionmentioning

confidence: 99%

Improving the Spatial Resolution of Magneto Resistive Sensors via Deconvolution

Hölzl

Zagar

2013

IEEE Sensors J.

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State-of-the-art GMR sensors are becoming increasingly popular for a variety of applications, due to of the progress in the area of magnetic field sensor technologies in the recent years. Especially in the area of nondestructive testing, the number of applications based on magnetic field sensors is steadily increasing. Until now, a major concern of these applications has been to improve the sensor's sensitivity to be able to measure even minimal magnetic field variations. However, an equally important characteristic, the sensor's spatial resolution, is often neglected in discussions. In this paper, the spatial resolution of two different GMR sensors is analyzed. The sensors are modeled as linear space-invariant systems. With the analytical solution for the magnetic field above a current carrying conductor and a corresponding measurement, the attainable spatial resolution is determined comparing two different deconvolution methods, an inverse and a Wiener filter. Finally, the determined sensor characteristics are used to improve the measurement accuracy significantly.

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“…Giant-magnetoresistance (GMR) sensors have high sensitivity and signal dynamics and negligible temperature and frequency dependences. GMR sensors have been used in an MFL inspection system [4,5].This paper presents an oil-pipeline MFL inspection system using GMR sensors. The following sections of this paper describe the characteristics of the GMR sensor.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

A Giant-Magnetoresistance Sensor for Magnetic-Flux-Leakage Nondestructive Testing of a Pipeline

Chen

Que

Jin

2005

Russ J Nondestruct Test

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This paper presents the method of magnetic-flux-leakage (MFL) detection and the characteristics of a giant-magnetoresistance (GMR) sensor. An experimental apparatus that uses a GMR sensor for oil-pipeline inspection is described. A permanent-magnet assembly was used to excite MFL signals. The signal from the GMR sensor is preamplified with an appropriate gain. The result shows the magnetic-flux-leakage method based on a GMR sensor can detect small defects in an oil pipeline. 1 Over the years, many different nondestructive testing techniques have been investigated for evaluating the condition of oil pipelines. The magnetic-flux-leakage (MFL) technique is generally considered the modest cost-effective method for corrosion monitoring. In order to ensure that the product is safely and efficiently transported, the pipelines are periodically inspected for damage caused by corrosion and other factors using a device called an intelligent pig. The pig, in brief, is a magnetizer assembly, which employs the magnetic-flux-leakage technique for assessing the condition of a pipe [1]. A pig travels in a pipeline with the flow of the product transported through the pipeline. A strong permanent magnet (often NdFeB, for its high field strength) in the pig nearly saturates the pipe wall with a magnetic flux flowing in the axial direction. Any metal damage in the pipe wall that causes significant geometric distortion acts as an area of increased magnetic reluctance and causes local perturbation of the magnetic-field distribution. As a result, the level of leakage-flux density increases locally near a defect, both inside and outside the pipe. Magneticfield sensors are usually installed around the circumference of the pig between the two poles of the magnetizer to measure the leakage flux.In the domain of magnetic-field sensors, ferromagnetic-thin-film magnetoresistance (MR) sensors and Hall effect magnetic sensors have by far the highest industrial importance. Hall sensors have much lower sensitivities. A Hall sensor system may require a large electronic gain, which limits the achievable bandwidth of the sensor system. On the other hand, Hall sensors show no saturation effects at high magnetic fields. Additionally, in most cases, the measured magnetic field must be perpendicular to the sensor chip [2]. The MR sensors used most often are anisotropic magnetoresistance (AMR) sensors. AMR magnetic sensors have high resolution and high bandwidth, but they become saturated in a rather small magnetic field and may require a complex resetting procedure. Owing to the emergence of nanotechnology, thin layers down to the nanometer range have been achieved, which has lead to the discovery of a new class of MR effects. This new MR effect has been called "giant" owing to its enormous value in comparison to the AMR effect [3]. Giant-magnetoresistance (GMR) sensors have high sensitivity and signal dynamics and negligible temperature and frequency dependences. GMR sensors have been used in an MFL inspection system [4,5].This paper presents an oil-pip...

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Evaluation of stress loaded steel samples using GMR magnetic field sensor

Cited by 16 publications

References 5 publications

Magnetoresistive Sensor Development Roadmap (Non-Recording Applications)

Magnetoresistive Sensor Development Roadmap (Non-Recording Applications)

Improving the Spatial Resolution of Magneto Resistive Sensors via Deconvolution

A Giant-Magnetoresistance Sensor for Magnetic-Flux-Leakage Nondestructive Testing of a Pipeline

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