Optics and Precision Engineering, Volume. 31, Issue 9, 1325(2023)
Design and verification of dual-cell cesium optically pumped magnetometer
Regarding the wide application of geomagnetic field measurement in magnetic prospecting, navigation, and positioning, the measurement range of the single-cell self-oscillating optically pumped magnetometer (OPM) is limited by the phase-shift circuit, and the existing dual-cell OPM abroad exhibits a low integration degree and poor portability. In this study, the integration of the dual-cell OPM is improved to break the blockade and improve the research level of the domestic OPM. Through the derivation and demonstration of the principle of the OPM, a highly integrated structure design of the dual-cell cesium OPM is presented. A VCSEL is used as the pump light source, and a knife-edge right-angle prism mirror is used as the spectroscope, while other components are arranged symmetrically along the optical axis. A dual-pump light structure with left- and right-handed circularly polarized light and a dual-cell arrangement is used, which achieves precise phase-shift compensation and avoids the need for a phase-shift circuit. The geomagnetic field in the experimental environment is 37 586.79 nT, as measured by a prototype, and the magnitude of the triaxial component is obtained via the scanning method. The measurement range of the OPM prototype is 25 700-77 000 nT, and the sensitivity is approximately 20 pT
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Yiming HUANG, Shaoliang LI, Manruo LUO, Zhaocai WU, Hua LIU. Design and verification of dual-cell cesium optically pumped magnetometer[J]. Optics and Precision Engineering, 2023, 31(9): 1325
Category: Micro/Nano Technology and Fine Mechanics
Received: Sep. 22, 2022
Accepted: --
Published Online: Jun. 6, 2023
The Author Email: LIU Hua (liuyuhua@sjtu.edu.cn)