Results 171 to 180 of about 90,554 (217)

A reliable and reproducible real-time access to sensorimotor rhythm with a small number of optically pumped magnetometers

Journal of Neural Engineering
Objective. Recent advances in biomagnetic sensing have led to the development of compact, wearable devices capable of detecting weak magnetic fields generated by biological activity. Optically pumped magnetometers (OPMs) have shown significant promise in
N. Fedosov, Daria Medvedeva, Oleg Shevtsov, A. Ossadtchi   +3 more
semanticscholar   +1 more source

Dynamic Magnetic Field Compensation Based on Real-Time Signal Separation for Array Optically Pumped Magnetometers

IEEE Sensors Journal
Optically pumped magnetometers (OPMs) operating in the spin-exchange relaxation-free (SERF) regime achieve excellent sensitivity in environments with zero magnetic fields. Therefore, it is essential to suppress the environment’s magnetic field.
Yaqiong Niu, Longsheng Cheng, Xingshen Hou, C. Ye   +3 more
semanticscholar   +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

Suppression of Amplitude and Phase Errors in Optically Pumped Magnetometers Using Dual-PI Closed-Loop Control

IEEE Transactions on Instrumentation and Measurement
Optically pumped magnetometer (OPM) has gained popularity as a viable alternative to the superconducting quantum interference device (SQUID) for biomagnetic measurements.
Teng Long, Xinda Song, Zhaoxin Duan, Yuchen Suo, Zhendong Wu, Le Jia, Bangcheng Han   +6 more
semanticscholar   +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.
openaire   +1 more source

Response of Lock-In Detection-Based Optically Pumped Magnetometers to High Bandwidth Magnetic Signals

IEEE Sensors Letters
Detection of magnetic fields generated by deep brain stimulation (DBS) using optically pumped magnetometers (OPMs) operating in the spin-exchange relaxation-free (SERF) regime holds significant promise.
Mevlüt Yalaz, E. Elzenheimer, Henrik Wolframm, Silvia Knappe-Grüneberg, M. Höft, Gunther Deuschl, A. Helmers, T. Sander   +7 more
semanticscholar   +1 more source

Magnetic field imaging with radio-frequency optically pumped magnetometers [Invited]

Chinese Optics Letters (COL)
High-sensitivity radio-frequency optically pumped magnetometers (RF-OPMs), working without cryogenic condition, play a critical role in magnetic field imaging (MFI) at low frequencies (e.g., 100 Hz to 1 MHz).
Xiyu Liu, Junlong Han, Wei Xiao, Teng Wu, Xiang Peng, Hong Guo   +5 more
semanticscholar   +1 more source

Optimizing longitudinal spin relaxation in miniaturized optically pumped magnetometers

Physical Review Applied
The microfabrication of cesium vapor cells for optically pumped magnetometry relies on optimization of buffer gas pressure in order to maximize atomic coherence time and sensitivity to external magnetic signals.
A. McWilliam, S. Dyer, D. Hunter, M. Mrozowski, S. Ingleby, O. Sharp, D. P. Burt, P. Griffin, J. McGilligan, E. Riis   +9 more
semanticscholar   +1 more source