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分析旋转介质中的声表面波(SAW)陀螺效应,推导了角速度与声波波速的关系,并讨论声光耦合波方程。将角速度与波速变化的关系式代入声光衍射效率公式,得出声光耦合情况下角速度与衍射效率公式的关系式,依据此关系对声光陀螺结构进行优化设计。优化设计表明,对于耦合效率大的铌酸锂晶体在光波损耗不大时其X切Y传,Z切Y传具有最大的刻度因子,在此结构下其精度为2.06°/h,比单一的SAW陀螺提高2个数量等级。
The SAW gyro effect in rotating media is analyzed, the relationship between angular velocity and acoustic velocity is deduced, and the acousto-optic coupled wave equation is discussed. The relationship between the angular velocity and the velocity of wave is substituted into the formula of the acousto-optic diffraction efficiency, and the relation between the angular velocity and the diffraction efficiency formula under the acousto-optic coupling is obtained. Based on this relationship, the structure of the acousto-optic gyroscope is optimized. The optimized design shows that the X-cut Y-pass and Z-cut Y-pass have the largest scale factor when the coupling loss of lithium niobate crystals is low, and the accuracy of this structure is 2.06 ° / h, SAW gyro to increase the number of 2 levels.