为解决磁屏蔽筒制约原子自旋磁强计灵敏度的问题,通过改进多层磁屏蔽筒轴向系数公式获得磁屏蔽筒参数优化模型,并在仅改变一项参数而其他参数固定的条件下,依据优化模型,利用Matlab软件对各参数对轴向屏蔽系数的影响程度进行仿真.结果表...为解决磁屏蔽筒制约原子自旋磁强计灵敏度的问题,通过改进多层磁屏蔽筒轴向系数公式获得磁屏蔽筒参数优化模型,并在仅改变一项参数而其他参数固定的条件下,依据优化模型,利用Matlab软件对各参数对轴向屏蔽系数的影响程度进行仿真.结果表明:随着最内层筒半径、筒长及径向层间距的增大,轴向屏蔽系数迅速减小;轴向间隙越大,则屏蔽系数越大.根据仿真结果及实际应用需要优化设计磁屏蔽筒参数,并利用Ansoft软件对优化筒和非优化筒的屏蔽效果进行仿真.结果表明,在外界磁场相同的情况下,未优化和经优化设计的磁屏蔽筒屏蔽能效分别约为152.1和158.6 d B.因此,通过参数优化模型可获得体积小、质量轻、成本低、屏蔽性能大的磁屏蔽筒.展开更多
A robust performance evaluation method for vapor cells used in magnetometers is proposed in this work.The performance of the vapor cell determines the sensitivity of the magnetic measurement,which is the core paramete...A robust performance evaluation method for vapor cells used in magnetometers is proposed in this work.The performance of the vapor cell determines the sensitivity of the magnetic measurement,which is the core parameter of a magnetometer.After establishing the relationship between intrinsic sensitivity and the total relaxation rate,the total relaxation rate of the vapor cell can be obtained to represent the intrinsic sensitivity of the magnetometer by fitting the parameters of the magnetic resonance experiments.The method for measurement of the total relaxation rate based on the magnetic resonance experiment proposed in this work is robust and insensitive to ambient noise.Experiments show that,compared with conventional sensitivity measurement,the total relaxation rate affected by magnetic noise below 0.9 n T,pump light frequency noise below 1.5 GHz,pump light power noise below 9%,probe light power noise below 3%and temperature fluctuation of 150±3℃deviates by less than 2%from the noise-free situation.This robust performance evaluation method for vapor cells is conducive to the construction of a multi-channel high-spatial-resolution cardio-encephalography system.展开更多
文摘为解决磁屏蔽筒制约原子自旋磁强计灵敏度的问题,通过改进多层磁屏蔽筒轴向系数公式获得磁屏蔽筒参数优化模型,并在仅改变一项参数而其他参数固定的条件下,依据优化模型,利用Matlab软件对各参数对轴向屏蔽系数的影响程度进行仿真.结果表明:随着最内层筒半径、筒长及径向层间距的增大,轴向屏蔽系数迅速减小;轴向间隙越大,则屏蔽系数越大.根据仿真结果及实际应用需要优化设计磁屏蔽筒参数,并利用Ansoft软件对优化筒和非优化筒的屏蔽效果进行仿真.结果表明,在外界磁场相同的情况下,未优化和经优化设计的磁屏蔽筒屏蔽能效分别约为152.1和158.6 d B.因此,通过参数优化模型可获得体积小、质量轻、成本低、屏蔽性能大的磁屏蔽筒.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.62173020 and 62103381)。
文摘A robust performance evaluation method for vapor cells used in magnetometers is proposed in this work.The performance of the vapor cell determines the sensitivity of the magnetic measurement,which is the core parameter of a magnetometer.After establishing the relationship between intrinsic sensitivity and the total relaxation rate,the total relaxation rate of the vapor cell can be obtained to represent the intrinsic sensitivity of the magnetometer by fitting the parameters of the magnetic resonance experiments.The method for measurement of the total relaxation rate based on the magnetic resonance experiment proposed in this work is robust and insensitive to ambient noise.Experiments show that,compared with conventional sensitivity measurement,the total relaxation rate affected by magnetic noise below 0.9 n T,pump light frequency noise below 1.5 GHz,pump light power noise below 9%,probe light power noise below 3%and temperature fluctuation of 150±3℃deviates by less than 2%from the noise-free situation.This robust performance evaluation method for vapor cells is conducive to the construction of a multi-channel high-spatial-resolution cardio-encephalography system.
