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| 基于磁场调制的原子磁强计单光束检测 |
| Atomic magnetometer single beam detection based on magnetic field modulation |
| 投稿时间：2023-12-03 |
| DOI：10.3969/j.issn.1005-5630.202312030130 |
| 中文关键词: 原子磁强计 磁场调制 单光束 弱磁检测 |
| 英文关键词:atomic magnetometer magnetic field modulation single beam weak magnetic detection |
| 基金项目:国家重点研发计划“地球观测与导航”重点专项(2017YFB0503102) |
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| 摘要点击次数: 1930 |
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| 中文摘要: |
| 原子磁场测量正在随着量子传感、信息和仪器仪表等技术的进步逐渐发展为新一代超高灵敏磁场测量技术。其中，无自旋交换弛豫原子磁强计是一种具有极高灵敏度的磁强计。提出了一种基于磁场调制的单光束原子磁强计，通过检测碱金属原子气室的透射光强来获知相应的外界磁场的大小。采用波长为795 nm的近红外光对铷原子进行泵浦，在调制频率为1.1 kHz，调制幅值为82 nT，调制指数为0.887时，系统灵敏度最高达到175.4 fT/Hz1/2。实验证明，这种设计的结构是合理且易于小型化的，在微弱磁场测量、生物磁场测量等多个领域具有实用价值。 |
| 英文摘要: |
| Atomic magnetic field measurement technology is gradually developing into a new generation of ultra-sensitive magnetic field measurement technology with the progress of quantum sensing, information and instrumentation technology. The spin-exchange relaxation free (SERF) atomic magnetometer is a kind of magnetometer with extremely high sensitivity. A single beam atomic magnetometer based on magnetic field modulation is proposed in this paper. The transmitted light intensity of alkali metal atom gas chamber was detected to obtain the corresponding external magnetic field. The rubidium atoms are pumped by near-infrared light with a wavelength of 795 nm. The maximum sensitivity of the system is 175.4 fT/Hz1/2 with the modulation frequency of 1.1 kHz, the modulation amplitude of 82 nT, and the modulation index of 0.887. Experiments show that the designed structure is reasonable and easy to miniaturize, and has practical value in many fields such as weak magnetic field and biological magnetic field measurement. |
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