Free-induction-decay magnetic field imaging with a microfabricated Cs vapor cell.
Free-induction-decay magnetic field imaging with a microfabricated Cs vapor cell.
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DOI：
10.1364/oe.500278
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发表时间：
2023-03
期刊：
影响因子：
3.8
通讯作者：
D. Hunter;C. Perrella;A. McWilliam;J. McGilligan;M. Mrozowski;S. Ingleby;P. Griffin;D. Burt
中科院分区：
文献类型：
--
作者：
D. Hunter;C. Perrella;A. McWilliam;J. McGilligan;M. Mrozowski;S. Ingleby;P. Griffin;D. Burt
磁场成像是信号源定位和表征的宝贵资源。这项工作报告了一种基于自由感应衰变(FID)协议的光泵磁强计(OPM)，它实现了微制造铯(Cs)蒸气电池技术，以可视化放置在电池附近的各种磁源产生的磁场分布。在氮气缓冲气体存在的情况下，Cs原子的缓慢扩散使得能够在同一气室内通过将直径175μm的探测光束平移到感应区来进行空间独立的测量。例如，OPM被用来记录时间和空间信息，以重建一维和二维的磁场分布。在奈奎斯特500赫兹的有限带宽内，磁强计的最佳灵敏度估计为0.43pT/Hz。此外，该传感器的动态范围超过了大约50μT的地球磁场，这为在非屏蔽环境中进行磁场成像提供了一个框架。
Magnetic field imaging is a valuable resource for signal source localization and characterization. This work reports an optically pumped magnetometer (OPM) based on the free-induction-decay (FID) protocol, that implements microfabricated cesium (Cs) vapor cell technology to visualize the magnetic field distributions resulting from various magnetic sources placed close to the cell. The slow diffusion of Cs atoms in the presence of a nitrogen (N2) buffer gas enables spatially independent measurements to be made within the same vapor cell by translating a 175 μm diameter probe beam over the sensing area. For example, the OPM was used to record temporal and spatial information to reconstruct magnetic field distributions in one and two dimensions. The optimal magnetometer sensitivity was estimated to be 0.43 pT/H z within a Nyquist limited bandwidth of 500 Hz. Furthermore, the sensor's dynamic range exceeds the Earth's field of approximately 50 μT, which provides a framework for magnetic field imaging in unshielded environments.