Bell-Bloom型Cs-^(4)He光泵磁力仪可行性研究  

Feasible Scheme of Bell⁃Bloom Cs⁃^(4)He Optically Pump Magnetometer

作　　者：陈豪燃 伏吉庆 孔嘉 CHEN Haoran;FU Jiqing;KONG Jia(College of Science,Hangzhou Dianzi University,Hangzhou,Zhejiang 310018,China;National Institute of Metrology,Beijing 100029,China)

机构地区：[1]杭州电子科技大学理学院,浙江杭州310018 [2]中国计量科学研究院,北京100029

出　　处：《计量学报》2025年第1期87-91,共5页Acta Metrologica Sinica

基　　金：国家自然科学基金(12374463,11935012);国家重点研发计划(2022YFF0607502)。

摘　　要：Cs-^(4)He光泵磁力仪以其较高的准确性优势,在磁场计量领域有着重要的地位;但其灵敏度指标并不理想,大大限制了其应用场景。从Cs-^(4)He光泵磁力仪的磁响应实验数据出发,分析得到了其灵敏度主要受限于射频展宽的实际状况。针对这一限制,从理论上提出了将Bell-Bloom原理与Cs-^(4)He光泵磁力相结合的研究方案。该方案使用光场调制替代射频磁场调制,有望减小射频展宽对灵敏度的影响,从而显著提升磁场探测的灵敏度。通过理论计算,得出该方案可以将Cs-^(4)He光泵磁力仪探测磁场的灵敏度提高1/3的结论。此外,还重点分析讨论了该方案可行的工作区间。通过对比自旋交换碰撞、潘宁电离形成的角动量交换速率和磁场导致的拉莫尔进动频率,给出了Bell-Bloom型Cs-^(4)He光泵磁力仪可工作的磁场范围。With its high accuracy,the Cs-^(4)He optically pump magnetometer has an important position in the field of magnetic field measurement.However,its sensitivity is still not ideal,which greatly limits its applications.Based on the magnetic response experimental data of the Cs-^(4)He optically pumped magnetometer,the practical limitations of its sensitivity,primarily due to radiofrequency(RF)broadening is analyzed.To improve its sensitivity,a research approach that combines the Bell-Bloom principle with the Cs-^(4)He optically pumped magnetometer is proposed.Here using optical field modulation instead of RF magnetic field modulation,which is expected to reduce the impact of RF broadening,thereby significantly enhancing the magnetometer’s magnetic field detection sensitivity.Theoretical calculations suggest that this approach could improve the sensitivity of the Cs-^(4)He optically pumped magnetometer by one-third.In addition,the mentioned research also focuses on the analysis and discussion of the feasible working range of the scheme.By comparing the angular momentum exchange rate formed by spin-exchange collision,Penning ionization and the Ramel precession frequency caused by the magnetic field,the working magnetic field range of the Bell-Bloom Cs-^(4)He optical pump magnetometer is given.

关 键 词：磁学计量 铯氦磁力仪 光泵 Bell-Bloom原理 拉莫尔进动 角动量交换 

分 类 号：TB972[一般工业技术—计量学]