A Novel GMR-Based Eddy Current Sensing Probe With Extended Sensing Range

Sakthivel, Mithun; George, Boby; Sivaprakasam, Mohanasankar

doi:10.1109/tmag.2015.2498908

Cited by 12 publications

(3 citation statements)

References 15 publications

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“…The penetration depth can be enhanced, but low resolution, low signal-to-noise ratio and low detection speed at the same time are obvious disadvantages of this method. In recent years, some new ideas have emerged [9][10][11][12][13]. Janousek [14] proposed a new type of the eddy current probe.…”

Section: Introductionmentioning

confidence: 99%

Metrology and Measurement Systems

Wu,

Zhang,

Wang

2020

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Due to the skin effect of eddy currents, the depth of cracks which can be detected by the traditional eddy current probe is very limited. In order to improve the ability of eddy current probes to inspect deep cracks in metal thick-walled structures, a new eddy current probe using an excitation system with phase shifted fields was proposed. Its feasibility for detecting deep cracks was verified by simulation and experiments. The results showed that the penetration depth of eddy currents in austenitic stainless steel is effectively enhanced by using the new probe.

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Section: Introductionmentioning

confidence: 99%

Metrology and Measurement Systems

Wu,

Zhang,

Wang

2020

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“…A hall sensor is commonly used for magnetic field detection, because it has a simple structure; however, the sensitivity is not sufficient to detect a tiny magnetized metal object [5]. A magneto-resistance (MR) sensor has better resolution than a hall sensor [6], and a giant magneto-resistance (GMR) sensor has better resolution than an MR sensor [7]. Overall, the three sensors above have similar power consumption.…”

Section: Introductionmentioning

confidence: 99%

Metal Detection Sensor Utilizing Magneto-Impedance Magnetometer

Choi

2018

Journal of Sensors

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A magnetometer with a longitudinal sensing line using the MI effect was examined experimentally to find an application to replace conventional metal sensors based on an LVDT. A sampling to the second peak signal from the pickup coil on the sensing head with a long, thin soft magnetic ribbon and driven with an ultrashort pulse train with a pulse width of 5~7 ns formed the front end of the metal sensor. Unmatched degaussing and geomagnetic field compensation methods were effective not only to minimize the remnant magnetic field but also to prevent the saturation of the magnetic ribbon and expand the dynamic range. The active noise reduction process reduced the inherent noise to the 1/3 level with a minimum influence on the detection signal. The proposed metal sensor with unmatched degaussing, geomagnetic field compensation, and active noise reduction techniques demonstrated the detection of a 0.2 mm diameter magnetized ferrous ball.

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“…An EC probe is mainly composed of exciting coils and a pick-up element, and carries a non-uniform current that induces the eddy current in conductive materials. Depending on applications, different pick-up elements, coils, and sensors such as Superconducting Quantum Interference Device (SQUID), Hall, Anisotropic Magnetoresistance (AMR), Giant Magneto-impedance (GMI), Giant Magnetoresistance (GMR) [1][2][3][4][5][6], and Tunnel MagnetoResistance (TMR) [7] are used.…”

Section: Introductionmentioning

confidence: 99%

Angular Spectral Density and Information Entropy for Eddy Current Distribution

Chen

Zhang

2016

Entropy

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Here, a new method is proposed to quantitatively evaluate the eddy current distribution induced by different exciting coils of an eddy current probe. Probability of energy allocation of a vector field is modeled via conservation of energy and imitating the wave function in quantum mechanics. The idea of quantization and the principle of circuit sampling is utilized to discretize the space of the vector field. Then, a method to calculate angular spectral density and Shannon information entropy is proposed. Eddy current induced by three different exciting coils is evaluated with this method, and the specific nature of eddy current testing is discussed.

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A Novel GMR-Based Eddy Current Sensing Probe With Extended Sensing Range

Cited by 12 publications

References 15 publications

Metrology and Measurement Systems

Metrology and Measurement Systems

Metal Detection Sensor Utilizing Magneto-Impedance Magnetometer

Angular Spectral Density and Information Entropy for Eddy Current Distribution

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