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光纤陀螺仪可用于测量载体相对惯性空间的角运动,是光纤惯导系统的核心部件。因此,要求光纤陀螺仪具有较高的精度和良好的环境适应性。光纤环是光纤陀螺仪的角速度敏感部件,光纤环受到环境因素影响,将导致光纤陀螺仪精度下降,因此需要对光纤环采取适当的保护措施。分析了气压变化导致光纤陀螺仪零偏稳定性变差的机理:环境气压的急剧变化,会使光纤环上产生附加应力,造成光纤的折射率分布不均,导致光路产生非互易性相位差,使光纤陀螺仪零偏产生漂移,零偏稳定性变差;并提出了对光纤陀螺仪进行密封的措施来抑制该效应。经试验验证,采用此密封设计后,光纤陀螺仪在变气压环境中的零偏稳定性改善了近10倍。
Fiber optic gyroscopes can be used to measure the angular motion of the carrier in relative inertial space and are the core components of fiber optic INS. Therefore, the requirements of fiber optic gyroscope with high accuracy and good environmental adaptability. The optical fiber loop is an angular velocity sensitive component of the optical fiber gyroscope. Since the optical fiber loop is affected by environmental factors, the precision of the optical fiber gyroscope will be reduced. Therefore, appropriate protection measures must be taken for the optical fiber loop. The mechanism that the air pressure changes the stability of the optical fiber gyroscope caused by the bias is analyzed. The sharp changes of the atmospheric pressure can cause additional stress on the optical fiber ring, resulting in the uneven distribution of the refractive index of the optical fiber, resulting in the non-reciprocal phase difference of the optical path , The drift of the optical fiber gyro is offset and the stability of the bias deviation is deteriorated. A measure of sealing the optical fiber gyro is put forward to suppress the effect. The experimental verification, the use of this seal design, optical gyroscope in the atmospheric pressure bias stability improved nearly 10 times.