论文标题
基于光磁化的电流源
Optical Magnetometry based Current Source
论文作者
论文摘要
我们提出了基于光学磁力测定法的当前监测系统，该系统能够区分真正的电流变化与室温下的环境效应。该系统由一个专用的热稳定磁场限制线圈和四个以二维梯度仪配置排列的四个光泵仪的阵列。这些磁力计监测线圈内的磁场变化，这与线圈驱动电流的变化相关。该系统使用数字信号处理单元实时提取和记录磁力计测量的磁场值，这允许对电流进行实时监视。系统的线圈是由印刷电路板制成的，可以轻松更改以适应电流转换。因此，我们可以将该系统的适用性扩展到各种电流。通过使用此系统积极反馈控制当前的源，我们将电流稳定在一个高于$ 5 \ times 10^{ - 9} $的水平上。
We present a current monitoring system based on optical magnetometry, which is able to discriminate true current variations from environmental effects at room temperature. The system consists of a dedicated thermally stable magnetic field confining coil and an array of four optically pumped magnetometers arranged in a two-dimensional gradiometer configuration. These magnetometers monitor magnetic field variations inside the coil, which correlate to the variations of the driving current of the coil. The system uses a digital signal-processing unit to extract and record in real time the magnetic field values measured by the magnetometers, which allows a real time monitoring of the current. The system's coil, which is made out of printed circuit boards, can easily be changed to adapt the current-to-field conversion. Thus, we can expand the applicability of this system to a wide range of currents. By using this system to actively feedback control a current source we stabilized a current of 20 mA on a level better than $5 \times 10^{-9}$.
