The Rb-Xe coupling effect in optically pumped NMR gyroscopes

Yi Zhang; Jiajia Li; Qiyuan Jiang; Zhiguo Wang; Hui Luo; Kaiyong Yang

doi:10.1016/j.jmr.2022.107295

The Rb-Xe coupling effect in optically pumped NMR gyroscopes

J Magn Reson. 2022 Nov:344:107295. doi: 10.1016/j.jmr.2022.107295. Epub 2022 Sep 17.

Authors

Yi Zhang¹, Jiajia Li², Qiyuan Jiang², Zhiguo Wang³, Hui Luo⁴, Kaiyong Yang²

Affiliations

¹ College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China; Interdisciplinary Center of Quantum Information, National University of Defense Technology, Changsha 410073, China.
² College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China.
³ College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China; Interdisciplinary Center of Quantum Information, National University of Defense Technology, Changsha 410073, China. Electronic address: maxborn@163.com.
⁴ College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China; Interdisciplinary Center of Quantum Information, National University of Defense Technology, Changsha 410073, China. Electronic address: luohui.luo@163.com.

PMID: 36270057
DOI: 10.1016/j.jmr.2022.107295

Abstract

Optically pumped nuclear magnetic resonance (NMR) gyroscope has been widely concerned as a future gyroscope with great development potential. In this study, the Rb-Xe coupling effect in this gyroscope between the alkali metal magnetometer and the noble gas NMR is investigated. The theoretical formulae about this effect are obtained based on Bloch equation and demonstrated by experiments. In order to see the influence of this effect on the gyro signal, the Xe NMR frequency changes with the carrier frequency and demodulation phase of the Rb magnetometer are studied with the deduced formulae. More importantly, theoretical analysis shows that this coupling effect can also significantly reduce the efficiency of the dual species scheme, which is used to suppress the influence of magnetic fluctuation. Therefore, to remove the Rb-Xe coupling effect, a simple and preliminary decoupling scheme operated by locking the phase difference to zero is proposed and demonstrated. All this work is of great significance to the improvement of the NMR gyro performance and future applications.

Keywords: Decoupling scheme; Magnetic noise suppression; NMR gyroscope; Rb-Xe coupling effect.