Results 111 to 120 of about 3,295 (205)

High-Temperature Alkali Vapor Cells with Anti-Relaxation Surface Coatings

, 2009
Antirelaxation surface coatings allow long spin relaxation times in alkali-metal cells without buffer gas, enabling faster diffusion of the alkali atoms throughout the cell and giving larger signals due to narrower optical linewidths.
Corney A., M. V. Romalis, S. J. Seltzer
core   +1 more source

Beyond sensitivity: what are the enabling opportunities of OPM-MEG?

Frontiers in Medical Technology
While optically-pumped magnetometer (OPM) technology offers a number of compelling advantages over its SQUID predecessor for magnetoencephalography (MEG), many studies and viewpoints focus on issues of (i) scalp placement, with commensurate increases in ...
Timothy P. L. Roberts, Timothy P. L. Roberts, Charlotte Birnbaum, Luke Bloy, William Gaetz, William Gaetz   +5 more
doaj   +1 more source

Measuring Human Auditory Evoked Fields with a Flexible Multi-Channel OPM-Based MEG System

Journal of Integrative Neuroscience
Background: Magnetoencephalography (MEG) is a non-invasive imaging technique for directly measuring the external magnetic field generated from synchronously activated pyramidal neurons in the brain.
Xin Zhang, Yan Chang, Hui Wang, Yin Zhang, Tao Hu, Xiao-yu Feng, Ming-kang Zhang, Ze-kun Yao, Chun-qiao Chen, Jia-yu Xu, Fang-yue Fu, Qing-qian Guo, Jian-bing Zhu, Hai-qun Xie, Xiao-dong Yang   +14 more
doaj   +1 more source

Facial magnetomyography using an array of optically pumped magnetometer

Laryngo-Rhino-Otologie
Measuring facial muscle activity is crucial in the diagnosis of facial palsy. This study investigated whether contactless Magnetomyography (MMG) using optically pumped magnetometers (OPM) is feasible for visualizing facial muscle activity.An anatomically shaped mask featuring eleven OPM was arranged on one side of the face of five healthy subjects. MMG
von Fraunberg, Johannes, Lu, Hongyu, Yang, Haodi, Marquetand, Nura, Braun, Christoph, Rüttiger, Lukas, Wolpert, Stephan, Knipper, Marlies, Siegel, Markus, Löwenheim, Hubert, Marquetand, Justus   +10 more
openaire   +2 more sources

A high-sensitivity laser-pumped Mx magnetometer [PDF]

, 2018
.: We discuss the design and performance of a laser-pumped cesium vapor magnetometer in the Mx configuration. The device will be employed in the control and stabilization of fluctuating magnetic fields and gradients in a new experiment searching for a ...
Bison, G., Groeger, S., Schenker, J.-L, Weis, A., Wynands, R.   +4 more
core  

Development of a ³He magnetometer for a neutron electric dipole moment experiment [PDF]

, 2014
We have developed a highly sensitive 3He magnetometer for the accurate measurement of the magnetic field in an experiment searching for an electric dipole moment of the neutron.
Daum, Manfred, Heil, Werner, Koch, Hans-Christian, Kraft, Andreas, Lauer, Thorsten, Neumann, Daniel, Pazgalev, Anatoly, Sobolev, Yuri, Weis, Antoine   +8 more
core  

Attitude-Independent Route Tracking for Subsea Power Cables Using a Scalar Magnetometer under High Sea Conditions

Remote Sensing
To overcome the shortcoming wherein the accuracy of subsea cable detection can be affected by the determination of the bias vector, scale factors, and non-orthogonality corrections of the vector magnetometer, a real-time attitude-independent route ...
Guozhu Li, Xuxing Geng, Shangqing Liang, Yuanpeng Chen, Guangming Huang, Gaoxiang Li, Xueting Zhang, Guoqing Yang   +7 more
doaj   +1 more source

Stroboscopic microwave spectroscopy of Voigt-based optically pumped magnetometers

Physical Review A
We present results of stroboscopic microwave spectroscopy of radio-frequency dressed optically pumped magnetometer. Interaction between radio-frequency dressed atoms and a synchronously pulsed microwave field followed by Voigt effect-based optical probing allows us to perform partial state tomography and assess the efficiency of the state preparation ...
Hans Marin Florez, Tadas Pyragius, Thomas Fernholz   +2 more
openaire   +2 more sources

Concurrent spinal and brain imaging with optically pumped magnetometers

Journal of Neuroscience Methods
The spinal cord and its interactions with the brain are fundamental for movement control and somatosensation. However, brain and spinal electrophysiology in humans have largely been treated as distinct enterprises, in part due to the relative inaccessibility of the spinal cord.
Mardell, Lydia C, Spedden, Meaghan E, O'Neill, George C, Tierney, Tim M, Timms, Ryan C, Zich, Catharina, Barnes, Gareth R, Bestmann, Sven   +7 more
openaire   +3 more sources

Spectral analysis of spin noise in an optically spin-polarized stochastic Bloch equation driven by noisy magnetic fields

AIP Advances
We theoretically analyze an optically spin-polarized collection of atoms, which serves as a basis for atomic sensors. Assuming that the intrinsic atomic spin projection noise is negligible, we provide the closed-form autocorrelation function and the ...
Minwoo M. Kim, Sangkyung Lee
doaj   +1 more source