US 12,405,326 B2
Experimental apparatus and method for regulating and controlling Zeeman transition of magnetic resonance
Peixian Miao, Gansu (CN); Yanchao Shi, Gansu (CN); Dayong Chen, Gansu (CN); Jiqing Lian, Gansu (CN); Jinhai Zhang, Gansu (CN); Jianxiang Wang, Gansu (CN); Shiyu Yang, Gansu (CN); Hao Feng, Gansu (CN); Yuhua Xiao, Gansu (CN); Hongwei Zhu, Gansu (CN); Hu Dai, Gansu (CN); Jun Yang, Gansu (CN); Jianhui Tu, Gansu (CN); Wei Yang, Gansu (CN); Jingzhong Cui, Gansu (CN); Jiang Chen, Gansu (CN); and Zhidong Liu, Gansu (CN)
Assigned to LANZHOU INSTITUTE OF PHYSICS, Gansu (CN)
Appl. No. 18/551,239
Filed by LANZHOU INSTITUTE OF PHYSICS, Gansu (CN)
PCT Filed Jul. 2, 2021, PCT No. PCT/CN2021/104324
§ 371(c)(1), (2) Date Sep. 19, 2023,
PCT Pub. No. WO2022/217761, PCT Pub. Date Oct. 20, 2022.
Claims priority of application No. 202110412374.4 (CN), filed on Apr. 16, 2021.
Prior Publication US 2024/0329168 A1, Oct. 3, 2024
Int. Cl. G01R 33/26 (2006.01)
CPC G01R 33/26 (2013.01) 8 Claims
OG exemplary drawing
 
1. An experimental apparatus for regulating and controlling a Zeeman transition of magnetic resonance, comprising: a background magnetic field generating component, a pump-probe atomic magnetometer, and a z-axis polarized light detection component;
wherein the background magnetic field generating component is configured to generate a uniform and stable background magnetic field along a z-axis;
the z-axis polarized light detection component is configured to detect a signal of the Zeeman transition of magnetic resonance;
a pump-probe atomic magnetometer is located at the center of a background magnetic field generated by the background magnetic field generating component, and is configured to measure a magnetic field at a rubidium cell;
a radio frequency signal is controlled to be a π/2 pulse or a π pulse by controlling an amplitude of a signal output by a radio frequency signal source of the pump-probe atomic magnetometer, a pulse time interval between radio frequency pulse signals is controlled by controlling an opening or closing of output of the radio frequency signal source, and the Zeeman transition of magnetic resonance is regulated and controlled by adjusting the pulse time interval between the radio frequency pulse signals;
wherein a Larmor precession frequency f0 corresponding to the background magnetic field is equal to a frequency f of a sinusoidal signal output by the radio frequency signal source; all radio frequency pulse signals used for regulating and controlling the Zeeman transition of magnetic resonance have the same initial phase; a duration tπ/2 of the π/2 pulse of the radio frequency signal is set to conform to an expression: f0×tπ/2=i, i being a positive integer; a first radio frequency pulse signal is a π/2 pulse, and this pulse signal excites an atomic magnetic moment to process into an x-y plane; when the atomic magnetic moment is in the x-y plane: when a time interval between two radio frequency π/2 pulse signals is n/f0, a second π/2 pulse completes complete the Zeeman transition of magnetic resonance; when the time interval between two radio frequency π/2 pulse signals is (m−0.5)/f0, the second π/2 pulse stops and reverses the Zeeman transition of magnetic resonance; when the atomic magnetic moment is in the x-y plane, a radio frequency π pulse signal causes the atomic magnetic moment to finally return to the x-y plane; and the time interval n/f0 or (m−0.5)/f0 between the two radio frequency π/2 pulse signals corresponds to the condition that the atomic magnetic moment freely precesses around the background magnetic field by 2nπ or (2m−1) π radians, respectively, wherein n and m are positive integers.