原子磁强计检测光闭环稳定系统设计

SERF态原子磁强计已实现人类历史上最高的0.16fT/Hz1/2的灵敏度。其检测方法主要是法拉第调制法。但法拉第调制法中光电流摄动或环境温度变化等干扰导致的检测光强的起伏会造成检测结果的不准确。为抑制检测光强起伏,设计了闭环原子磁强计检测光稳定系统。在法拉第调制法的基础上,增加了光路子系统和控制子系统对检测光强进行闭环稳定控制。通过对随机干扰进行闭环控制仿真与实验,验证本系统可以有效抑制各种干扰引起的光强起伏,使系统抗干扰能力提高1.2%,从而提高原子磁强计的检测精度。

Design of closed-loop steady system for atomic magnetometer detecting light

SERF atomic magnetometer has reached the highest sensitivity of 0.16 fT /Hz1 /2in human＇s history.Faraday modulation method is the mainly used method for its detecting.But fluctuation of light intensity due to light current disturbance or environment temperature alteration will lead to inaccuracy of detecting result.To solve this problem,closed-loop atomic magnetometer detecting light stable system is designed.Add light path sub-system and control sub-system,on the basis of Faraday modulation method to carry out closed-loop stable control on detecting light intensity.Through closed-loop control simulation and experiment on random interference,verify the system may effectively restrain light intensity fluctuation caused by various disturbances,improve anti-interference ability by 1.2 %,thus the atomic magnetometer detecting precision is improved.