Human magnetoencephalogram measurements using newly developed compact module of high-sensitivity atomic magnetometer
Human magnetoencephalogram measurements using newly developed compact module of high-sensitivity atomic magnetometer
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DOI：
10.7567/jjap.54.026601
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发表时间：
2015-02-01
影响因子：
1.5
通讯作者：
Kobayashi, Tetsuo
中科院分区：
文献类型：
--
作者：
Kameda, Keigo;Sato, Daichi;Kobayashi, Tetsuo
在生物磁测量领域，光泵原子磁力计（OPAM）有望成为基于超导量子干涉器件（SQUID）的磁力计的替代传感器。此外，需要小型化的OPAM用于实际应用。为了解决这个问题，我们开发了一个紧凑的模块的高灵敏度的OPAM与泵探测安排和钾用作传感原子。由于OPAM在10 Hz处的噪声谱密度达到21 f T-rms/Hz（1/2），我们尝试用它来测量人体心磁图（MEG）。与基于SQUID的磁力计获得的结果相比，我们可以成功地观察到与睁眼相关的8-13 Hz频带中的事件相关去极化的明显特征。结果表明，使用OPAM模块的神经磁场测量的可行性。(C)2015日本应用物理学会
In the field of biomagnetic measurements, optically pumped atomic magnetometers (OPAMs) are expected to be alternative sensors to magnetometers based on superconducting quantum interference devices (SQUIDs). In addition, miniaturized OPAMs are required for practical use. To address this issue, we developed a compact module of a high-sensitivity OPAM with a pump probe arrangement and potassium used as the sensing atom. Because the noise spectrum density of the OPAM reached 21 f T-rms/Hz(1/2) at 10 Hz, we attempted to use it to measure human magnetocardiograms (MEGs). Compared with the results obtained with SQUID-based magnetometers, we could successfully observe distinct features of event-related desynchronization in the 8-13 Hz band associated with eye opening. The results demonstrate the feasibility of using the OPAM module for neuromagnetic field measurements. (C) 2015 The Japan Society of Applied Physics