基于调腔技术的棱镜式激光陀螺损耗控制

Loss Control in Prismatic Laser Gyroscope Based on Cavity Adjustment Technique

棱镜式环形谐振腔反射、折射点多。为了保证陀螺稳定工作,对棱镜各工作面的角度误差、塔差以及调腔提出了严格的要求。将子午面及弧矢面内棱镜的工作面角度误差、球面偏心等作为微扰项,修正光在棱镜表面反射和折射的传输矩阵。建立棱镜式环形谐振腔光束几何偏折损耗和光路空间非共面损耗的物理模型,利用修正后的传输矩阵分析了角度误差造成光束偏离设计位置的程度。设计了基于棱镜配套筛选、谐振腔损耗控制的调腔方法。实验证明,新调腔方法使环形谐振腔一次合格率由75%提高至90%以上。

There are many reflected and refracted points in prism ring cavity.The angle of work plane,pyramidal error and cavity adjustment are strictly required in order to ensure the stability of gyroscopes.We set the angle error of prisms and sphere eccentricity as the perturbation terms in meridian and sagittal planes,and amend the transmission matrices of light reflecting and refracting in prism surfaces.We establish physical models of light geometric deflection loss and light path non-coplanar loss in prism ring cavity,and analyze the rate of deviation from the design position by the revised transmission matrices.Based on the assorted screen and resonant loss controlled,we design a new way for cavity adjustment.The experimental results show that the new cavity adjustment method makes once pass rate rise to above 90% from 75%.