Metal Detection Sensor Utilizing Magneto-Impedance Magnetometer

Choi, Kyoo Nam

doi:10.1155/2018/3675090

Cited by 5 publications

(3 citation statements)

References 16 publications

(17 reference statements)

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“…ferromagnetic microwires [2][3][4][5][6], ribbons [7], and thin films [8][9][10]. Apart from fundamental research interest, in the technological context materials exhibiting a large MI effect arise as field/stress-sensitive sensors that can be integrated into a wide range of devices [11][12][13][14][15][16]. Special emphasis has been placed on Co-based and Fe-based glass-coated microwires.…”

Section: Introductionmentioning

confidence: 99%

Broadband measurements of the surface impedance in ferromagnetic wires as a boundary condition for scattering problems

Uddin

Qin

Estévez

et al. 2023

Meas. Sci. Technol.

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In the cm-wave range, the skin depth is comparable to the micron radius of ferromagnetic wires and thus their magnetic and conductive properties will influence the scattered electromagnetic field. Solving the scattering problem by considering the complicated internal magnetic structure of the wire becomes unpractical. There is a need to develop hybrid methods when the external problem of scattering on an inclusion is solved together with the experimental impedance conditions on its surface. Herein, we propose an accurate broadband impedance measurement technique operating up to 15 GHz. The PCB measurement and calibration cells designed in this work allow flexibility in choosing external stimuli such as magnetic field, tensile stress, and heat. The experimental impedance can be then used as the boundary condition in electromagnetic simulations making it possible to model, predict and design wire-based composites using numerical solvers such as CST Studio Suite.

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Section: Introductionmentioning

confidence: 99%

Broadband measurements of the surface impedance in ferromagnetic wires as a boundary condition for scattering problems

Uddin

Qin

Estévez

et al. 2023

Meas. Sci. Technol.

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“…M AGNETOMETER is a widely used sensor across a range of tasks, including attitude control [1], [2], navigation and mapping [3]- [5] and metal object detection [6]. It is a constituent of an inertial measurement unit (IMU), which is a key component for localization tasks.…”

Section: Introductionmentioning

confidence: 99%

Robust Autocalibration of Triaxial Magnetometers

Hong

Kang

Kim

2021

IEEE Trans. Instrum. Meas.

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Self-calibration of a magnetometer usually requires controlled magnetic environment as the calibration output can be affected by field distortions from nearby magnetic objects. In this paper, we develop a 2-stage method which can accurately selfcalibrate magnetometer from measurements containing anomalous readings due to local magnetic disturbances. The method proceeds by robustly fitting an ellipsoid to measurement data via L1-norm convex optimization, yielding initial model variables that are less prone to magnetic disruptions. These are then served as a starting point for robust nonlinear least squares optimization, which refines the magnetometer model to minimize sensor estimation errors while suppressing heavy anomalies. Synthetic and real experimental results are provided to demonstrate improved accuracy of the proposed method in presence of outliers. We additionally show empirically that the method is directly applicable to self-calibration of 3-axis accelerometers.

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“…Room temperature-sensitive magnetic sensors have been developed and used in various areas of communication, geological exploration, medical diagnostics, nondestructive evaluation (NDE), and security control [1][2][3][4][5][6][7][8][9][10]. These sensors are normally operated in unshielded environment with big background interferences, such as the power line interference.…”

Section: Introductionmentioning

confidence: 99%

A Feedback Method to Improve the Dynamic Range and the Linearity of Magnetoimpedance Magnetic Sensor

2019

Journal of Sensors

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We developed a high-sensitivity magnetoimpedance magnetic field sensor using a FeCoSiB amorphous wire and a coil wound around it. The amorphous wire had the diameter of 0.1 mm and the length of 5 mm. The magnetic field resolution of about 20 pT/√Hz was achieved. But the dynamic range of the magnetoimpedance magnetic field sensor was only about ±0.7 Gauss, which was not enough for some applications, such as the defect evaluation of steel plate. The linearity of the system was also not good when big magnetic field was applied, which will cause some noise when the system is used in unshielded environment. We developed a feedback method to improve the dynamic range and the linearity of the magnetic field sensor. The operation point of the magnetic field sensor was fixed by sending a feedback current to the coil. Using the feedback method, the dynamic range was improved from ±0.7 Gauss to ±10 Gauss and the linearity was also improved over 100 times better. An eddy current testing system using the magnetic sensor was developed, and the crack defects in steel plate and in 3D-printed titanium alloy plate were evaluated.

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Metal Detection Sensor Utilizing Magneto-Impedance Magnetometer

Cited by 5 publications

References 16 publications

Broadband measurements of the surface impedance in ferromagnetic wires as a boundary condition for scattering problems

Broadband measurements of the surface impedance in ferromagnetic wires as a boundary condition for scattering problems

Robust Autocalibration of Triaxial Magnetometers

A Feedback Method to Improve the Dynamic Range and the Linearity of Magnetoimpedance Magnetic Sensor

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