Fiber optic magnetometer with sub-pico Tesla sensitivity for magneto-encephalography
Fiber optic magnetometer with sub-pico Tesla sensitivity for magneto-encephalography
复制标题
用于脑磁图的亚皮特斯拉灵敏度光纤磁力计
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M. Tabib
中科院分区：
文献类型：
--
作者：
P. Pai;Lingyao Chen;M. Tabib
本工作报道了一种高灵敏度的谐振式法拉第力磁强计，其最小可检测磁场为277fT，频率为17.2赫兹，适用于室温下的脑磁图和脑电路成像。在这种灵敏度水平下，我们的传感器可以在不需要液氦冷却的情况下与超导量子干涉设备(SQUID)竞争，并有可能监测人类在自然环境中的行为。除了室温工作外，与SQUID相比，我们的传感器更紧凑(约4 mm2的器件面积)，并且具有与MEMS器件相当的功耗。耦合到光纤波导的光强随传感悬臂梁的位移呈指数变化，与电子隧道探测器相比，光学磁强计具有大的动态范围和高的灵敏度。
This work reports a highly sensitive resonant Faraday force magnetometer with a minimum detectable rms magnetic field of 277 fT at 17.2 Hz suitable for magneto-encephalography and brain circuit imaging at room temperature. At this level of sensitivity, our sensor can favorably compete with superconducting quantum interference devices (SQUIDs) without requiring liquid helium cooling and with the possibility of monitoring brain activity in humans behaving in our natural environment. In addition to room temperature operation, our sensor is more compact (~4 mm2 device area) compared to SQUIDs and has power dissipation comparable to MEMS devices. The light intensity coupled to the fiber optic waveguide varies exponentially with the displacement of the sensing cantilever and in contrast to electron tunneling detectors, the optical magnetometer has a large dynamic range and high sensitivity.