O'Dwyer Carolyn, Ingleby Stuart J, Chalmers Iain C, Griffin Paul F, Riis Erling
Department of Physics, SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom.
Rev Sci Instrum. 2020 Apr 1;91(4):045103. doi: 10.1063/5.0002964.
We present an unshielded, double-resonance magnetometer in which we have implemented a feed-forward measurement scheme in order to suppress periodic magnetic noise arising from, and correlated with, the mains electricity alternating current line. The technique described here uses a single sensor to track ambient periodic noise and feed forward to suppress it in a subsequent measurement. This feed forward technique has shown significant noise suppression of electrical mains-noise features of up to 22 dB under the fundamental peak at 50 Hz, 3 dB at the first harmonic (100 Hz), and 21 dB at the second harmonic (150 Hz). This technique is software based, requires no additional hardware, and is easy to implement in an existing magnetometer.
我们展示了一种无屏蔽双共振磁力计，其中我们实施了一种前馈测量方案，以抑制由市电交流电源线产生并与之相关的周期性磁噪声。这里描述的技术使用单个传感器来跟踪环境周期性噪声，并在前馈以在后续测量中抑制它。这种前馈技术在50Hz基波峰值下对市电噪声特征的抑制高达22dB，在一次谐波（100Hz）下为3dB，在二次谐波（150Hz）下为21dB。该技术基于软件，无需额外硬件，并且易于在现有的磁力计中实现。
