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Miniature quad-channel spin-exchange relaxation-free magnetometer for magnetoencephalography
- Source :
- Chinese Physics B. 28:040703
- Publication Year :
- 2019
- Publisher :
- IOP Publishing, 2019.
-
Abstract
- A miniature quad-channel optically pumped atomic magnetometer (OPM) has been developed based on the spin-exchange relaxation-free (SERF) mechanism. With a vapor cell of size 8 mm×8 mm×8 mm, we have incorporated four SERF magnetometer channels, which provides sufficient spatial resolution for magnetoencephalography (MEG). The four channels share the same laser beam for the best cancellation of common mode noise due to laser fluctuations. With gradient measurement, the sensitivities of the four sensors are better than 6 fT/Hz1/2, which is also good enough for MEG measurement. The vapor cell is heated to 160 °C by a novel nonmagnetic current-heating structure. Our sensor with high spatial resolution and compact size is particularly suitable for MEG systems.
- Subjects :
- Materials science
medicine.diagnostic_test
Magnetometer
business.industry
Relaxation (NMR)
General Physics and Astronomy
02 engineering and technology
Magnetoencephalography
021001 nanoscience & nanotechnology
Laser
01 natural sciences
law.invention
Optics
law
0103 physical sciences
High spatial resolution
medicine
010306 general physics
0210 nano-technology
business
Spin (physics)
Image resolution
Communication channel
Subjects
Details
- ISSN :
- 20583834 and 16741056
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Chinese Physics B
- Accession number :
- edsair.doi...........f08980e7c3d2996ae5eb2ef0dde15267