A proportion-integral-derivative closed-loop frequency-locking method for improving the accuracy and sensitivity of a magnetometer. (26th August 2020)

• Record Type: Journal Article
• Authors: Deng, Shengli; Zhang, Weidong; Guo, Hao; Wu, Dajin; Li, Zhonghao; Wen, Huanfei; Tang, Jun; Han, Xingcheng; Ma, Zongmin; Liu, Jun; Li, Yanjun
• Is Part Of: Laser physics letters. Volume 17:Number 10(2020:Oct.)
• Publication Date: 2020-08-26
• Subjects: nitrogen-vacancy center -- magnetometer -- proportion-integral-derivative closed-loop frequency-locking -- sensitivity; Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-202X/abad43
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: Proportion-integral-derivative (PID) closed-loop frequency-locking (CLFL) technology has been demonstrated to improve the magnetic field sensitivity of spin-based sensors based on the nitrogen-vacancy (NV) color centers in diamond. First, we analyse the undulation effect of the fluorescence quantum yield of NV centers with a magnetic field. The valley value of the magnetic resonance spectrum have been differential into a zero to insensitive to intensity fluctuations of fluorescence quantum yield of NV centers based on the PID-CLFL technology. Then, the sensitivity of the magnetic field improved from 40 nT Hz −1/2 to 10 nT Hz −1/2 . It proves an effective method to improve the sensitivity of the spin-based sensors.