Noise reduction and signal-to-noise ratio improvement of atomic magnetometers with optical gradiometer configurations
Noise reduction and signal-to-noise ratio improvement of atomic magnetometers with optical gradiometer configurations
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DOI：
10.1364/oe.23.006976
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发表时间：
2015-03-09
期刊：
影响因子：
3.8
通讯作者：
Kobayashi, Tetsuo
中科院分区：
文献类型：
--
作者：
Kamada, Keigo;Ito, Yosuke;Kobayashi, Tetsuo
在生物磁测量领域，光泵原子磁力计（OPAM）引起了极大的关注。随着信号响应的提高和传感器噪声的降低，OPAM的灵敏度主要受到环境磁噪声的限制。为了减少这种磁噪声，我们开发了光学梯度计，其中玻璃池内两个不同测量区域的差分输出是通过一个探测光束的磁光旋转直接获得的。在适当的条件下操作时，通过光学梯度仪的差分测量提高了灵敏度。此外，赝磁噪声和信号的测量表明信噪比得到了改善。这些结果证明了我们的光学梯度计作为降低磁噪声的有效方法的可行性。 (C) 2015年美国光学学会
In the field of biomagnetic measurement, optically-pumped atomic magnetometers (OPAMs) have attracted significant attention. With the improvement of signal response and the reduction of sensor noise, the sensitivity of OPAMs is limited mainly by environmental magnetic noise. To reduce this magnetic noise, we developed the optical gradiometer, in which the differential output of two distinct measurement areas inside a glass cell was obtained directly via the magneto-optical rotation of one probe beam. When operating in appropriate conditions, the sensitivity was improved by the differential measurement of the optical gradiometer. In addition, measurements of the pseudo-magnetic noise and signal showed the improvement of the signal-to-noise ratio. These results demonstrate the feasibility of our optical gradiometer as an efficient method for reducing the magnetic noise. (C) 2015 Optical Society of America