一种SERF陀螺仪核自旋自补偿点存在条件判定方法

A method for judging the existence of nuclear spin self-compensation point in SERF gyroscope

核自旋自补偿技术是无自旋交换弛豫(SERF)原子自旋陀螺仪角速率测量的关键。但是,并不是所有条件下SERF系统自补偿点均存在。根据SERF陀螺仪动力学演化机理,通过数学极值法推导出核自旋自补偿点存在条件判定方法,即Δ值是否满足不小于0的条件,并分析了影响核自旋自补偿点存在的主要因素。通过延长核自旋弛豫时间及提高核自旋极化率不仅能实现自补偿点的存在条件,还能有效提升核自旋自补偿能力,为在有限条件下提高SERF陀螺性能提供了理论指导。实验测试了不同核自旋弛豫时间及极化率下系统自补偿点存在情况,结果与理论预期相符,验证了该判定方法的有效性。所提方法补充了核自旋自补偿成立条件,完善了核自旋自补偿理论体系,为实现高精度工程化SERF陀螺仪提供理论基础。

Nuclear spin self-compensation is the key to angular velocity measurement for SERF(Spin Exchange Relaxation Free)atomic spin gyroscope.However,the SERF gyroscope is not able to compensate the magnetic field under all conditions.Based on the system dynamic,the condition for the existence of the self-compensation point by the mathematical extreme method is proposed,that is theΔvalue is not less than 0,and the main effect factors are analyzed.Through increasing the nuclear spin relaxation time and polarization can not only realize the self-compensation but also improve the compensation capability of SERF gyroscope,which provides theoretical guidance for enhance the system performance under limited situations.The existence of self-compensation points under different nuclear spin relaxation time and polarizability is tested experimentally,and the results are consistent with the theoretical expectations,which verifies the validity of the method.The proposed method supplements the establishment conditions of nuclear spin self-compensation and perfects the theoretical system of self-compensation in SERF gyroscope,which supplies theoretical basis for the realization of high-precision atomic gyroscope.