A low-power, high-sensitivity micromachined optical magnetometer
A low-power, high-sensitivity micromachined optical magnetometer
复制标题
DOI：
10.1063/1.4770361
复制
发表时间：
2012-12-10
影响因子：
4
通讯作者：
Kitching, J.
中科院分区：
文献类型：
--
作者：
Mhaskar, R.;Knappe, S.;Kitching, J.
我们展示了一个光学磁力计的基础上，在微加工硅传感器头的微Rb-87蒸汽电池。通过用光纤将光引入传感器并通过附接到单元窗口的彩色滤光片吸收来加热单元，从而增加蒸汽单元中的碱原子密度。第二个光纤耦合光束光学泵浦和询问原子。磁力计在140mW的加热功率下工作，并且在从15 Hz到100 Hz的大部分频带内实现低于20 fT/root Hz的灵敏度。这种传感器可以测量来自人类心脏和大脑的磁场。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.4770361]
We demonstrate an optical magnetometer based on a microfabricated Rb-87 vapor cell in a micromachined silicon sensor head. The alkali atom density in the vapor cell is increased by heating the cell with light brought to the sensor through an optical fiber, and absorbed by colored filters attached to the cell windows. A second fiber-optically coupled beam optically pumps and interrogates the atoms. The magnetometer operates on 140mW of heating power and achieves a sensitivity below 20 fT/root Hz throughout most of the frequency band from 15 Hz to 100Hz. Such a sensor can measure magnetic fields from the human heart and brain. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4770361]