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Automatic Removal of Physiological Artifacts in OPM-MEG: A Framework of Channel Attention Mechanism Based on Magnetic Reference Signal. [PDF]
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Optically Pumped Nuclear Magnetometer
Review of Scientific Instruments, 1963A continuous recording total earth's field magnetometer has been demonstrated which utilizes optical pumping in He3 and the resultant polarization of the nuclear spins. The device operates as a ``self-oscillator'' at the Larmor frequency of the ground state atoms. The oscillator has a ``Q'' of 104 in a 0.5-G field.
L. D. Schearer +2 more
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Reducing crosstalk in optically-pumped magnetometer arrays
Physics in Medicine & Biology, 2019Optically pumped magnetometers (OPMs) operating in the spin-exchange relaxation-free regime are emerging as alternative sensors to superconducting quantum interference devices (SQUIDs) for magnetoencephalography (MEG). As the number of OPMs in a single imaging system increases to rival SQUID MEG systems, cross-talk between nearby sensors limits the ...
N V Nardelli, S P Krzyzewski, S A Knappe
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Optically Pumped Magnetometers for MEG
2014Optically-pumped magnetometers (OPMs) have seen rapid progress over the last decade in terms of performance and technology development. As highly sensitive room-temperature magnetometers they present several advantages over superconducting quantum interference device (SQUID) sensors, such as the possibility for conformal geometries and low-maintenance ...
Svenja Knappe +2 more
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Magnetoencephalography Using Optically Pumped Magnetometers
2020This chapter explores one of the most promising alternatives to superconducting quantum-interference devices (SQUIDs) as the fundamental building block of magnetoencephalography (MEG) systems: optically pumped magnetometers (OPMs). OPMs exploit the spin properties of alkali atoms, using a technique known as optical pumping to prepare a gas of atoms ...
Elena Boto +9 more
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Microfabricated Optically-Pumped Magnetometers
CLEO: 2014, 2014Optical magnetometers (OPMs), implemented by optical interrogation of alkali-atoms contained in a vapor cell, are among the most sensitive detectors for magnetic fields. Due to the fact that weak magnetic fields are ubiquitous in our world, high-sensitive magnetometers are demanded in a wide range of scientific and practical applications.
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Digital-locking optically pumped cesium magnetometer
2014 European Frequency and Time Forum (EFTF), 2014Lamp-based optically pumped Cesium magnetometer is one kind of commercial quantum magnetometers. In whatever military or civil magnetic field measurement, the practical optically pump magnetometer possesses a very important application value as well as prospect.
Rongye Shi +3 more
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Exceptional points in an optically pumped magnetometer
Journal of Physics D: Applied Physics, 2022Abstract The exceptional points (EPs) in a system are the eigenvalue degeneracy that has been demonstrated in a wide range of optical arrangements. In this paper, EP is analyzed schematically in an optically pumped magnetometer, which is governed by the Bloch equation with a
Haoye Qin, Ming Ding
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Self-Oscillating Magnetometer Utilizing Optically Pumped 4He
Review of Scientific Instruments, 1971An optically pumped resonance magnetometer has been constructed which utilizes 4He gas as the resonant element in the self-oscillator mode of operation. This instrument is capable of monitoring anomalies and fluctuations in the magnetic field with a sensitivity of 0.1 μG over the range of the earth's field (0.25–0.75 G). Recordings of variations in the
Robert E. Slocum +2 more
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