Results 81 to 90 of about 699 (162)

A Novel Strategy for Improving the Aeromagnetic Compensation Performance of Helicopters

Sensors, 2018
An aeromagnetic survey is an important method in magnetic anomaly detection and geophysical prospecting. The magnetic field is typically measured by optically pumped magnetometers (OPM) installed on the aircraft.
Luzhao Chen, Peilin Wu, Wanhua Zhu, Yongqiang Feng, Guangyou Fang   +4 more
doaj   +1 more source

A plateau in the sensitivity of a compact optically pumped atomic magnetometer

AIP Advances, 2014
In a compact optically pumped atomic magnetometer (OPAM), there is a plateau in the sensitivity where the dependence of the sensitivity on pumping power is small compared with that predicted by the uniform polarization model. The mechanism that generates
Natsuhiko Mizutani, Kazuhisa Okano, Kazuhiro Ban, Sunao Ichihara, Akira Terao, Tetsuo Kobayashi   +5 more
doaj   +1 more source

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

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

An Excitation Circuit of the Cell in Optically Pumped Magnetometer

International Journal of Circuits, Systems and Signal Processing, 2020
Cell is the key component in an optically pumped magnetometer. It is necessary to light the cell before measurement and to maintain the illuminated state. The accuracy and stability of magnetic values from the instrument are closely related to the brightness and stability of the cell.
openaire   +1 more source

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

The effect of sensor-to-source distance on magnetic neuromuscular signals

Scientific Reports
Magnetomyography (MMG) can be used as a contactless modality to study the neuromuscular system. On the one hand, being contactless is a practical advantage as there is no need to prepare skin or attach electrodes as in electromyography (EMG).
Haodi Yang, Thomas Klotz, Leonardo Gizzi, Hongyu Lu, Gianpiero Monittola, Urs Schneider, Markus Siegel, Justus Marquetand   +7 more
doaj   +1 more source

Magnetic particle imaging using a multi-axis optically pumped magnetometer and multiple flux transformers

Sensing and Bio-Sensing Research
Biofunctionalized magnetic nanoparticles (MNPs) have been widely studied for biomedical applications, including magnetic particle imaging (MPI), which is a promising diagnostic technique for cancer imaging.
Teruyoshi Sasayama, Shuji Taue, Takashi Yoshida   +2 more
doaj   +1 more source

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