Results 161 to 170 of about 90,554 (217)

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

In Situ Magnetic Field Compensation Method for Optically Pumped Magnetometers Under Three-Axis Nonorthogonality

IEEE Transactions on Instrumentation and Measurement
In this study, we demonstrate a three-axis synchronous sweeping field (TSSF) method for in situ magnetic field compensation under three-axis nonorthogonal conditions for optically pumped magnetometers (OPMs).
Teng Long, Xinda Song, Bangcheng Han, Yuchen Suo, Le Jia   +4 more
semanticscholar   +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.
openaire   +1 more source

A Brain–Computer Interface System Based on Magnetoencephalography With Optically Pumped Magnetometers

IEEE Transactions on Instrumentation and Measurement
This study presents a brain-computer interface (BCI) approach that uses optically pumped magnetometers (OPMs)-based magnetoencephalography (MEG) associated with motor imagery (MI) for the synchronous operation of a brain-controlled virtual drone in 3-D ...
Gaobo Tan, Jinming Gai, Fei Li, Qiying Huang, Wengyue Yu, Yuxiang Huang, Gui-Fang Zhang, Xiaohu Zhao, Qiang Lin, Zhenghui Hu   +9 more
semanticscholar   +1 more source

Magnetic vector field mapping of the stimulated abductor digiti minimi muscle with optically pumped magnetometers

Biomedical engineering and physics express
Objective. Mapping the myomagnetic field of a straight and easily accessible muscle after electrical stimulation using triaxial optically pumped magnetometers (OPMs) to assess potential benefits for magnetomyography (MMG). Approach.
Marlen Kruse, Simon Nordenström, Stefan Hartwig, J. Marquetand, Victor Lebedev, T. Middelmann, Philip Broser   +6 more
semanticscholar   +1 more source

Optimal Operating Temperature of Miniaturized Optically Pumped Magnetometers

IEEE Transactions on Instrumentation and Measurement, 2022
In recent years, significant developments have occurred in the field of optically pumped magnetometers (OPMs), which are widely used in biomagnetic measurements.
Shaowen Zhang, Jixi Lu, Mao Ye, Ying Zhou, Kaifeng Yin, F. Lu, Yeguang Yan, Y. Zhai   +7 more
semanticscholar   +1 more source

Enhancement of Magnetic Field Disturbance Suppression for Wearable Optically Pumped Magnetometers

IEEE Transactions on Instrumentation and Measurement
Wearable optically pumped magnetometers (OPMs) operating in the spin-exchange relaxation-free (SERF) regime are an emerging alternative for biomagnetic field measurements.
Jing Zhang, Xinda Song, Le Jia, Haoyuan Sun, Shengjie Qi, Zhendong Wu, Gang Liu   +6 more
semanticscholar   +1 more source

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

Contactless measurement of muscle fiber conduction velocity—a novel approach using optically pumped magnetometers

Journal of Neural Engineering
Objective. Muscle fiber conduction velocity (MFCV) describes the speed at which electrical activity propagates along muscle fibers and is typically assessed using invasive or surface electromyography. Because electrical currents generate magnetic fields,
Lukas Baier, Tim Brümmer, Burak Senay, Markus Siegel, Ahmet Doğukan Keleş, O. Röhrle, Thomas Klotz, N. Noury, J. Marquetand   +8 more
semanticscholar   +1 more source