Research and improvement of path length controlconfiguration for laser gyroscopes
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摘要: 腔长控制机构在激光陀螺中通过控制腔长来保证激光陀螺工作光束的频率稳定，其对激光陀螺性能的提高有着重要意义。针对激光陀螺工作过程中，传统腔长控制机构的控制镜扭偏导致光束在腔中的位置偏移毛细孔的中心位置，引起腔内的散射、损耗发生变化从而影响陀螺性能及精度的问题，对激光陀螺腔长控制机构进行了研究，并设计了一种新的腔长控制机构以减小控制镜的扭偏对陀螺产生的影响。利用有限元分析法对新腔长控制机构进行了优化设计和仿真。试验表明,新的腔长控制机构减小了控制镜的扭偏，使得激光陀螺的零偏稳定性由0.7/h提高至0.3/h。Abstract: Path length control configuration for ring laser gyroscopes (RLGs) maintains the stability of frequency of beams through controlling the path length, which is very important to improve the performance of RLG. Aiming at the deflection of beams in working RLG caused by the distorted control mirror in traditional path length control configuration, which leads to dispersion and changes of loss to affect the performance and precision of RLG, the path length control configuration for RLG was researched and a new path length control configuration which could reduce the effects of distorted control mirror on RLG was designed. Moreover, the simulation and optimization on the new path length control configuration were done with the direct coupled field analysis of the finite element (FE) method. Results show that the new path length control configuration reduces the distortion of the control mirror, improves the performance and precision of RLG, the zero-bias stability is increased from 0.7/h to 0.3/h.
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