Miniature quad-channel spin-exchange relaxation-free magnetometer for magnetoencephalography  

作　　者：Jian-Jun Li Peng-Cheng Du Ji-Qing Fu Xu-Tong Wang Qing Zhou Ru-Quan Wang 李建军;杜鹏程;伏吉庆;王旭桐;周庆;王如泉(Institute of Physics Chinese Academy of Sciences;School of Physical Sciences University of Chinese Academy of Sciences;National Institute of Metrology;School of Physics and Astronomy Yunnan University)

机构地区：[1]Institute of Physics Chinese Academy of Sciences [2]School of Physical Sciences University of Chinese Academy of Sciences [3]National Institute of Metrology [4]School of Physics and Astronomy Yunnan University

出　　处：《Chinese Physics B》2019年第4期145-149,共5页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(Grant Nos.2016YFA0300600 and 2016YFA0301500);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB07030000);the National Natural Science Foundation of China(Grant No.11474347)

摘　　要：A miniature quad-channel optically pumped atomic magnetometer(OPM) has been developed based on the spinexchange 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/Hz^(1/2), which is also good enough for MEG measurement. The vapor cell is heated to 160℃ by a novel nonmagnetic current-heating structure. Our sensor with high spatial resolution and compact size is particularly suitable for MEG systems.A miniature quad-channel optically pumped atomic magnetometer(OPM) has been developed based on the spinexchange 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/Hz^(1/2), which is also good enough for MEG measurement. The vapor cell is heated to 160℃ by a novel nonmagnetic current-heating structure. Our sensor with high spatial resolution and compact size is particularly suitable for MEG systems.

关 键 词：multi-channel SPIN-EXCHANGE relaxation-free optically PUMPED atomic MAGNETOMETER magne-toencephalography 

分 类 号：O4[理学—物理]