三脉冲冷原子陀螺仪中基于内态演化的拉曼光光强补偿算法

由于在复杂环境中拉曼光功率不稳定会导致原子脉冲的宽度发生改变,从而影响陀螺仪的测量精度。通过对冷原子干涉仪的干涉全过程进行建模,计算得出了陀螺仪在拉曼光改变情形下输出相位的解析表达式,即建立了拉曼光在非近共振条件下强度变化时陀螺仪的输出值与外界载体运动之间的关系。与此同时,基于该解析表达式提出了一种对拉曼光光强的补偿算法,能有效提升原子陀螺仪在复杂环境下的系统稳定性。通过光强调制实验验证了该算法的有效性,补偿后系统输出长期稳定性提升了33%。

Compensation Algorithm for Raman Pulse Intensity Based on Internal-state Evolution in Three Pulse Cold-atom Interference Gyroscope

The power of the Raman laser is unstable in a non-laboratory environment, which causes variation of the effective width of the Raman pulse, and affects the accuracy of the output of the gyroscope. Here we establish a model for the interference procedure in the atom interferometry, and give an analytical expression for the output phase of the gyroscope. This reveals the relation between the output of the gyroscope and the movement of the external carrier while the off-resonance Raman intensity is fluctuating. More importantly, we propose a compensation algorithm based on the analytical expression which can improve the stability of the atomic gyroscope in a non-laboratory environment. We verify this algorithm though a intensity modulation experiment. The long-term stability of the system is improved by 33% after the compensation.