Distributed network of optically pumped magnetometers for space weather monitoring [PDF]
Scientific ReportsSpatial variation in the intensity of magnetospheric and ionospheric fluctuations during solar storms creates ground-induced currents, of importance in both infrastructure engineering and geophysical science.
Marcin S. Mrozowski +8 more
doaj +7 more sources
Bias Calibration of Optically Pumped Magnetometers Based on Variable Sensitivity [PDF]
SensorsOptically pumped magnetometers (OPMs) functioning in the spin-exchange relaxation-free (SERF) regime have emerged as attractive options for measuring weak magnetic fields, owing to their portability and remarkable sensitivity.
Jieya Chen +4 more
doaj +3 more sources
Measuring the cortical tracking of speech with optically-pumped magnetometers [PDF]
NeuroImage, 2021 During continuous speech listening, brain activity tracks speech rhythmicity at frequencies matching with the repetition rate of phrases (0.2–1.5 Hz), words (2–4 Hz) and syllables (4–8 Hz).
Paul De Lange +2 more
exaly +6 more sources
Floquet description of optically pumped magnetometers [PDF]
Physical Review A, 2021 We present theoretical description of Voigt and Faraday effect based optically pumped magnetometers using the Floquet expansion. Our analysis describes the spin-operator dynamics of the first, $\hat{F}(t)$, and second, $\hat{F}^2(t)$, order moments and takes into account of different pumping profiles and decoherence effects.
Hans Marin Florez, Tadas Pyragius
openaire +4 more sources
Noninvasive Magnetic-Marking-Based Flow Metering with Optically Pumped Magnetometers
Applied Sciences, 2022 We present a noninvasive procedure that measures the flow velocity of a fluid by using polarized hydrogen nuclei in the fluid. The measurement procedure is based on a time-of-flight method where magnetic information is applied on the fluid with a ...
Leonhard Schmieder +3 more
doaj +2 more sources
Using optically pumped magnetometers to replicate task-related responses in next generation magnetoencephalography [PDF]
Scientific ReportsOptically pumped magnetometers (OPMs) offer a new wearable means to measure magnetoencephalography (MEG) signals, with many advantages compared to conventional systems.
Kristina Safar +7 more
doaj +3 more sources
Contactless measurements of retinal activity using optically pumped magnetometers [PDF]
NeuroImage, 2021 Optically pumped magnetometers (OPMs) have been adopted for the measurement of brain activity. Without the need to be cooled to cryogenic temperatures, an array of these sensors can be placed more flexibly, which allows for the recording of neuronal ...
Britta U. Westner +4 more
doaj +2 more sources
Multi-Parameter Optimization of Rubidium Laser Optically Pumped Magnetometers with Geomagnetic Field Intensity [PDF]
Sensors, 2023 Rubidium laser optically pumped magnetometers (OPMs) are widely used magnetic sensors based on the Zeeman effect, laser pumping, and magnetic resonance principles. They measure the magnetic field by measuring the magnetic resonance signal passing through
Kun Xu +9 more
doaj +2 more sources
A customized bed based stand alone array of optically pumped magnetometers for fetal magnetocardiography measurements [PDF]
Scientific ReportsFetal magnetocardiography (fMCG) is a non-invasive technique that measures the magnetic fields associated with fetal heart electrical activity outside of the maternal abdomen.
Diana Escalona-Vargas +4 more
doaj +2 more sources
High Sample Rate Optically Pumped Helium Magnetometer [PDF]
Journal of Optoelectronical Nanostructures, 2019 Optically pumped helium magnetometers are important instruments whichhave many applications in military, mass spectroscopy and space applications. In thispaper, the working principles of helium magnetometers have been explained.
Abdorreza Asrar +2 more
doaj +1 more source