Back to Search
Start Over
Multi-channel spin exchange relaxation free magnetometer towards two-dimensional vector magnetoencephalography
- Source :
- Optics Express. 27:597
- Publication Year :
- 2019
- Publisher :
- The Optical Society, 2019.
-
Abstract
- Optically pumped atomic magnetometers based on spin exchange relaxation free regime have recently become a powerful tool in the field of magnetoencephalography measurements. For this application of magnetometers, simultaneous multilocation magnetic field measurements are desired. To fulfill the requirement, we develop a multi-channel sensor module based on a single large vapor cell. The probe beam passes through the vapor cell twice by reflection and then records the two-dimensional spatial magnetic field distribution with two 2 × 2 photodiode matrixes. Comparing with the previous multi-channel tangential magnetic field measuring sensors, our magnetometer is sensitive to the normal magnetic field by operating in the longitudinal parametric modulation mode. Measuring the normal component is considered more suitable for magnetoencephalography, because the normal component provides more information. The sensitivities of the channels are approximately 10 fT/Hz1/2 in the normal direction. The auditory evoked magnetic fields of the four adjacent locations perpendicular to the scalp are detected simultaneously. Our magnetometer can measure the normal and tangential magnetic fields simultaneously. The dual-axis vector measurement of magnetic field is very important for magnetoencephalography.
- Subjects :
- Physics
Field (physics)
medicine.diagnostic_test
Magnetometer
business.industry
Physics::Medical Physics
Relaxation (NMR)
02 engineering and technology
Magnetoencephalography
021001 nanoscience & nanotechnology
01 natural sciences
Atomic and Molecular Physics, and Optics
law.invention
Magnetic field
010309 optics
Optics
law
0103 physical sciences
medicine
Light beam
0210 nano-technology
business
Normal
Spin-½
Subjects
Details
- ISSN :
- 10944087
- Volume :
- 27
- Database :
- OpenAIRE
- Journal :
- Optics Express
- Accession number :
- edsair.doi.dedup.....3c0b16b82fe0500d497ab1a5675df40d