Results 161 to 170 of about 3,346 (191)

Optically Pumped Magnetometers for MEG

2014
Optically-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, Tilmann Sander, Lutz Trahms   +2 more
openaire   +1 more source

Magnetoencephalography Using Optically Pumped Magnetometers

2020
This 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, Niall Holmes, Tim M. Tierney, James Leggett, Ryan Hill, Stephanie Mellor, Gillian Roberts, Gareth R. Barnes, Richard Bowtell, Matthew J. Brookes   +9 more
openaire   +1 more source

Microfabricated Optically-Pumped Magnetometers

CLEO: 2014, 2014
Optical 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), 2014
Lamp-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, Chang Liu, Sheng Zhou, Yanhui Wang   +3 more
openaire   +1 more source

Exceptional points in an optically pumped magnetometer

Journal of Physics D: Applied Physics, 2022
Abstract 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
openaire   +1 more source

Self-Oscillating Magnetometer Utilizing Optically Pumped 4He

Review of Scientific Instruments, 1971
An 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, P. Clayton Cabiness, Stephen L. Blevins   +2 more
openaire   +1 more source

Noise reduction in optically pumped magnetometer assemblies

Applied Physics B, 2010
In 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, R. IJsselsteijn, H.-G. Meyer   +2 more
openaire   +1 more source

Silicon Nitride‐Photonics‐Enabled Optical Pumping for Optically Pumped Magnetometer

Laser & Photonics Reviews
AbstractDiscrete 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, Zhen Chai, Xiaoqin Meng, Yan Xu, Jie Sun, Peng Zhou   +5 more
openaire   +1 more source

Recent Progress in Optically Pumped Magnetometers

Physica Scripta, 2003
Optically 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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Optically pumped atomic magnetometers after three decades

Optical Engineering, 1992
The main achievements in the development of optically pumped atomic magnetometers are reviewed. The best up-to-date magnetometers have sensitivities up to 0.1 pT/(Hz)1/2 and absolute accuracy of about 0.1 nT, permitting notless than 10 readings per 1 s. The main applications are earth field gradiometry and variometry.
openaire   +1 more source