中国激光, 2018, 45 (12): 1204006, 网络出版: 2019-05-09
利用高灵敏的无自旋交换弛豫原子磁力仪实现脑磁测量 下载: 1498次
Human Magnetoencephalography Measurement by Highly Sensitive SERF Atomic Magnetometer
测量 原子磁力仪 无自旋交换弛豫 脑磁图 measurement atomic magnetometer spin exchange relaxation free magnetoencephalography
摘要
设计了基于无自旋交换弛豫(SERF)的高灵敏度非低温铷原子磁力仪,其灵敏度在15 Hz处达到了6 fT/
Hz 。利用此SERF磁力仪,在屏蔽筒内测量了人脑视觉皮层在睁眼和闭眼状态下的磁场差异。该SERF磁力仪采用抽运-探测双光模式,与单光配置相比,双光SERF磁力仪可以实现更高的灵敏度,并且不需要额外的磁场调制,因此省略了采集系统中复杂的锁相放大器。这种装置更有利于实现小型化的全头脑磁图传感器阵列。
Abstract
A highly sensitive noncryogenic rubidium magnetometer based on spin exchange relaxation free (SERF) is designed, whose sensitivity at 15 Hz is 6 fT/
Hz. With this SERF magnetometer, the difference in the human brain magnetic field induced by eye opening and closing is recorded inside the shielded barrel. This SERF magnetometer is operated in double light mode with a pump-probe arrangement. Compared with single beam arrangement, this SERF magnetometer can achieve a higher sensitivity and does not require any extra magnetic modulation. Thus, the complexity of the acquisition system is reduced and the lock-in amplifier is not needed any more. Moreover, this kind of configuration is easily adapted to miniaturize the sensor array for the future whole-head magnetoencephalography equipment.
黄圣洁, 张桂迎, 胡正珲, 林强. 利用高灵敏的无自旋交换弛豫原子磁力仪实现脑磁测量[J]. 中国激光, 2018, 45(12): 1204006. Shengjie Huang, Guiying Zhang, Zhenghui Hu, Qiang Lin. Human Magnetoencephalography Measurement by Highly Sensitive SERF Atomic Magnetometer[J]. Chinese Journal of Lasers, 2018, 45(12): 1204006.