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腔长、磁场、增益、腔损等因素的变化是四频差动激光陀螺零漂的重要来源,为了提高陀螺精度,研究了零漂随这些因素的变化关系。首先固定谐振腔周长、互易偏频、法拉第偏频、腔损、峰值增益、多普勒加宽、气压、氖同位素比例,利用自洽方程组仿真了零漂随失谐频率和磁场的变化规律。然后分别改变谐振腔周长等8个参量,对零漂随失谐频率和磁场的变化规律进行了数值仿真。最后,对仿真结果进行了实验验证。结果表明:在最佳失谐频率下和/或最佳磁场下零漂为零,而且对不同谐振腔参量和增益气体参量的陀螺均有此规律。因此,通过控制陀螺的工作点能够消除磁场变化导致的零漂,通过外加磁场能够消除腔长变动导致的零漂,采取这两种控制之一即可消除偏频、腔损、增益、气压变化导致的零漂。
The changes of cavity length, magnetic field, gain, cavity loss and other factors are important sources of quadrupole differential laser gyro zero drift. In order to improve gyro precision, the variation of zero drift with these factors is studied. First of all, we fixed the resonator perimeter, reciprocal frequency offset, Faraday shift, cavity loss, peak gain, Doppler broadening, air pressure, neon isotope ratio. Using the self-consistent equations, The law of change. Then, the parameters of 8 parameters such as resonator perimeter are changed respectively, and numerical simulation of the variation of zero drift with frequency and field of detuning is carried out. Finally, the simulation results are verified experimentally. The results show that the zero drift is zero under the optimal detuning frequency and / or the optimal magnetic field, and this law is valid for the gyros of different resonator parameters and gain gas parameters. Therefore, by controlling the working point of the gyroscope, the zero drift caused by the change of the magnetic field can be eliminated, and the zero drift caused by the variation of the cavity length can be eliminated by applying the magnetic field. One of the two controls can eliminate the frequency offset, cavity loss, gain, Lead to zero drift.