气压变化对光纤陀螺仪零偏稳定性的影响及改进

Influence of air pressure variation on FOG bias stability and its improvement

研究了气压变化对光纤陀螺仪零偏稳定性的影响,提出了降低光纤陀螺仪气压灵敏度的设计方法。理论分析并实际测量了气压变化对光纤陀螺仪零偏稳定性的影响,试验研究了光纤环浸胶固化和密封这两种降低光纤陀螺仪气压灵敏度设计方法的有效性。结果表明,变气压条件下光纤陀螺仪的零偏稳定性劣化1~2个量级,对光纤环浸胶固化后,光纤陀螺仪的气压灵敏度减小1倍,可以在一定程度上减小空气的扰动,改善气压变化对光纤陀螺仪的影响。而对光纤陀螺仪进行密封设计是一种更有效的措施。对光纤陀螺仪进行密封设计后,光纤陀螺仪的气压灵敏度为零,光纤陀螺仪零偏稳定性基本不受变气压环境的影响,解决了光纤陀螺仪受气压变化影响精度的问题。

Influence of air pressure variation on the bias stability of fiber-optic gyroscope（FOG） was studied, and the design method of reducing the pressure sensitivity of the FOG was proposed. The influence of the pressure change on the FOG was theoretically analyzed and practically measured. Both the adhesive coating and the sealing techniques for the optical fiber ring were experimentally studied to reduce the pressure sensitivity of the FOG. The results show that the bias stability of the FOG is increased by 1-2 orders of magnitude compared with that under variable pressure. The air pressure sensitivity of the FOG is reduced by half after coating adhesive on the optical fiber ring, thus the air disturbance can be decreased, and the influence of air pressure change on the FOG is reduced. The results also show that the FOG sealing design is a more effective method. After sealing, the bias of FOG is not sensitive to variable air pressure at all, and the problem of FOG bias drift in variable air pressure environment is solved.