Results 151 to 160 of about 1,280 (179)
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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, 2019Abstract Optically 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 ...
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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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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Modification of the Optically Pumped Magnetometer for MRI
2011 5th International Conference on Bioinformatics and Biomedical Engineering, 2011According to the remote detection scheme, conventional MRI could be spatially separated into prepolarization, encoding and detection. Magnetometers with high sensitivity, such as optically pumped magnetometer, could then be applied in detection to improve the capability of MRI.
Wuyi Zhao +4 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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Recent Progress in Optically Pumped Magnetometers
Physica Scripta, 2003Optically pumped magnetometres (OPM) are known as the most precise instruments for scalar measurement of low magnetic fields, including those of the Earth's magnetic field. For a long time OPM could not compete, in absolute accuracy, with the proton precession magnetometers, being, at the same time, much more sensitive and fast.
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Silicon Nitride‐Photonics‐Enabled Optical Pumping for Optically Pumped Magnetometer
Laser & Photonics ReviewsAbstractDiscrete optical system in optically pumped magnetometers (OPMs) presents a significant challenge to their integration into high‐spatial‐resolution magnetic field detection. Here, the electron spin polarization of atoms using a fiber‐coupled silicon nitride () photonic integrated circuit (PIC) is demonstrated, by the way of delivering arrayed ...
Yuting Xu +5 more
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Noise reduction in optically pumped magnetometer assemblies
Applied Physics B, 2010In most magnetic field measurement configurations the resolution of optically pumped magnetometers is limited by the shot noise of the pump light. However, in practice this noise limit is overwhelmed by other sources. One of them is the conversion of the pump laser’s frequency modulation (FM) noise to amplitude modulation (AM) noise due to the ...
V. Schultze +2 more
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Optically Pumped Magnetometers Recent Advances and Applications in Biomagnetism: A Review
IEEE Sensors Journal, 2023Binbin Zhao, Lin Li, Yaohua Zhang
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