In the current article, we present the first solid-state sensor feasible for magnetoencephalography (MEG) that works at room temperature. The sensor is a fluxgate magnetometer based on yttrium-iron garnet films (YIGM). In this feasibility study, we prove the concept of usage of the YIGM in terms of MEG by registering a simple brain induced field-the human alpha rhythm. All the experiments and results are validated with usage of another kind of high-sensitive magnetometers-optically pumped magnetometer, which currently appears to be well-established in terms of MEG.
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http://dx.doi.org/10.1002/hbm.25582 | DOI Listing |
Sensors (Basel)
October 2024
Department of Earth, Environmental and Resources Sciences, University of Naples "Federico II", 80126 Naples, Italy.
In the past few decades, there has been a notable technological advancement in geophysical sensors. In the case of magnetometry, several sensors were used, having the common feature of being miniaturized and lightweight, thus idoneous to be carried by UAVs in drone-borne magnetometric surveys. A common feature is that their sensitivity ranges from 0.
View Article and Find Full Text PDFSensors (Basel)
June 2024
State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan 030051, China.
Magnetic anomaly detection (MAD) technology based on the magnetic gradient tensor (MGT) has broad application prospects in fields such as unexploded ordnance detection and mineral exploration. The difference approximation method currently employed in the MGT measurement system introduces measurement errors. Designing reasonable geometric structures and configuring optimal structural parameters can effectively reduce measurement errors.
View Article and Find Full Text PDFData Brief
June 2024
University of Zagreb, Faculty of Geodesy, Institute for Geomatics, Savska cesta 144A, Zagreb HR-10000, Croatia.
The highest level of the present-day geomagnetic recordings is presented by the absolute controlled magnetic measurements. This quality is permanently fulfilled in geomagnetic observatories (GO) only. The absolute records are based on nuclear magnetometers for the intensity measurement and on DIM (Declination and Inclination Magnetometer) instruments for the direction determination of the ambient magnetic field.
View Article and Find Full Text PDFSensors (Basel)
March 2024
Department of Mechanical Engineering, National Central University, Taoyuan 320317, Taiwan.
This research proposes a magnetic field sensor with spatial orientation ability. Through the assistance of a magnetic flux concentrator, out-of-plane magnetic flux can be concentrated and guided into the planar magnetic cores of a fluxgate sensor. A printed circuit board is used to construct the basic planar structure, on which the proposed three-dimensional magnetic flux concentrator and magnetic cores are assembled.
View Article and Find Full Text PDFJ Magn Reson
March 2024
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China.
Triaxial magnetic field coils are one of the most important components of magnetic resonance sensors. Traditional measurement methods for coil constants and non-orthogonal angles using fluxgate magnetometers are no longer suitable for small-volume nuclear magnetic resonance sensors. This study presents a method for measuring the coil constants and nonorthogonal angles of triaxial nuclear magnetic resonance coils using the dynamics of the electron paramagnetic resonance magnetometer without requiring any additional calibration equipment.
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