A microfabricated optically-pumped magnetic gradiometer
A microfabricated optically-pumped magnetic gradiometer
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DOI：
10.1063/1.4974349
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发表时间：
2017-01-16
影响因子：
4
通讯作者：
Knappe, S.
中科院分区：
文献类型：
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作者：
Sheng, D.;Perry, A. R.;Knappe, S.
报道了一种基于气相中碱原子光谱的微细加工原子磁梯度仪的研制。该梯度计工作在无自旋交换弛豫区，长度为60 mm，横截面直径为12 mm，由两个由普通激光解调的芯片级原子磁强计组成。该传感器可以在20赫兹以上的频率下测量10 fT/hz(1/2)的20 mm基线上的磁场差异。在10赫兹时，对磁场噪声的最大抑制为1000。通过使用一组缠绕在传感器上的补偿线圈，我们还测量了传感器在高达150 mg的几个外加偏置场强下的灵敏度。该器件适用于既需要敏感的梯度场信息又需要高共模噪声消除的应用。
We report on the development of a microfabricated atomic magnetic gradiometer based on optical spectroscopy of alkali atoms in the vapor phase. The gradiometer, which operates in the spin-exchange relaxation free regime, has a length of 60 mm and cross sectional diameter of 12 mm, and consists of two chip-scale atomic magnetometers which are interrogated by a common laser light. The sensor can measure differences in magnetic fields, over a 20 mm baseline, of 10 fT/Hz(1/2) at frequencies above 20 Hz. The maximum rejection of magnetic field noise is 1000 at 10 Hz. By use of a set of compensation coils wrapped around the sensor, we also measure the sensor sensitivity at several external bias field strengths up to 150 mG. This device is useful for applications that require both sensitive gradient field information and high common-mode noise cancellation.