High-sensitivity multi-channel probe beam detector towards MEG measurements of small animals with an optically pumped K-Rb hybrid magnetometer | Zendy

Kazumasa Nishi | Zendy; Yosuke Ito | Zendy; Tetsuo Kobayashi | Zendy

Open Access

High-sensitivity multi-channel probe beam detector towards MEG measurements of small animals with an optically pumped K-Rb hybrid magnetometer

Author(s) -

Kazumasa Nishi,

Yosuke Ito,

Tetsuo Kobayashi

Publication year - 2018

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.26.001988

Subject(s) - detector , optics , magnetometer , sensitivity (control systems) , image resolution , channel (broadcasting) , beam (structure) , materials science , electromagnetic coil , temporal resolution , physics , resolution (logic) , magnetic field , electronic engineering , computer science , telecommunications , engineering , quantum mechanics , artificial intelligence

Multi-channel measurements with fine spatial resolution will make magnetoencephalograms (MEGs) possible with small animals using optically pumped magnetometers (OPMs). Therefore, we fabricated a 20-channel probe-beam detector that uses a K-Rb hybrid OPM to increase the spatial resolution. First, we investigated the sensitivity of the detector using the multi-channel measurements and demonstrated that the detector had a fine sensitivity (10-20 fT/Hz 1/2 at 10 Hz). Subsequently, we measured magnetic field distribution generated from a loop coil and compared those measurements with analytically calculated distributions. The measurements were in good agreement with the theoretical predictions. The experimental results indicate that our newly developed multi-channel OPM detector has sufficient performance specifications for MEG measurements.

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