Optical Magnetometry based Current Source
Abstract
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 .
Keywords
Cite
@article{arxiv.2011.11493,
title = {Optical Magnetometry based Current Source},
author = {Peter A. Koss and Reza Tavakoli Dinani and Luc Bienstman and Georg Bison and Nathal Severijns},
journal= {arXiv preprint arXiv:2011.11493},
year = {2021}
}