CAJ | 학술논문

Bell-Bloom 是一种通过检测原子进动频率测量标量磁场的方法。本文的目的是验证基于幅值调制激光的Bell-Bloom 测量方法在高精度磁场测量领域的可行性，并在此基础上研究各种实验参数对共振线宽的影响。本文中采用幅值调制的方法，对抽运光的调制信号进行扫频，得到了系统的共振频谱，此时锁相放大器同时输出共振曲线和色散曲线，以用于闭环检测。通过理论仿真和实验结果的对比可以发现，线宽随着加热温度的升高、占空比的减小而单调减小，入射功率则存在最优值。另外，死区也是影响Bell-Bloom磁强计灵敏度的一个重要因素，实际应用时要尽量使被测物的主磁场垂直于抽运方向，从而避开死区，得到更为精确的磁场测量值。可参考本文的结论，对 Bell-Bloom 磁强计的参数进行设计和优化。
Bell-Bloom 시일충통과검측원자진동빈솔측량표량자장적방법。본문적목적시험증기우폭치조제격광적Bell-Bloom 측량방법재고정도자장측량영역적가행성，병재차기출상연구각충실험삼수대공진선관적영향。본문중채용폭치조제적방법，대추운광적조제신호진행소빈，득도료계통적공진빈보，차시쇄상방대기동시수출공진곡선화색산곡선，이용우폐배검측。통과이론방진화실험결과적대비가이발현，선관수착가열온도적승고、점공비적감소이단조감소，입사공솔칙존재최우치。령외，사구야시영향Bell-Bloom자강계령민도적일개중요인소，실제응용시요진량사피측물적주자장수직우추운방향，종이피개사구，득도경위정학적자장측량치。가삼고본문적결론，대 Bell-Bloom 자강계적삼수진행설계화우화。
Bell-Bloom is a method of measuring scalar magnetic field through detecting atomic Larmor frequency. The purpose of this paper is to validate the feasibility of the Bell-Bloom method based on amplitude-modulated laser in high sensitivity magnetic field measurement, and then study the effects of various experiment parameters on the resonance linewidth. In this paper, the amplitude-modulated method is adopted to sweep the frequency of the pumping laser modulation signal and obtain the resonant spectra of the system. At the same time, the resonance curves and disperse curves of the lock-in amplifier are outputted, which are used for close-looped detection. The comparison of theoretical simulation and experiment results shows that the linewidth monotonically decreases with the increasing of the heating temperature and the decreasing of the duty cycle, while the pumping power has an optimum value. Besides, the dead zone is another factor that influences the sensitivity of Bell-Bloom magnetometer; in practical application, the total field should be made perpendicular to the pumping laser to avoid the dead zone and obtain more accurate magnetic field measurement value. In general, the conclusion of this paper can be referred to design and optimize the parameters of Bell-Bloom magnetometers.