提出一种基于虚拟样机的光纤旋转连接器损耗的分析方法. 建立了道威棱镜系统中的光线输入-输出方程, 采用光线追迹和解析模型的混合架构建立了齐次坐标系下的光线分析模型.模型中的输入误差包括输入、输出准直透镜和道威棱镜的角度和位移误差、轴承游隙和齿轮准确度;对30 000个角度准确度±100″、位移准确度±0.01 mm的随机误差样本的损耗特性进行计算, 结果表明: 若要使公差引起的最大损耗小于4 dB、损耗分布P(X>3 dB)小于0.5%,则光纤旋转连接器中准直透镜和道威棱镜角度误差必须控制在±1′以内.

A fiber optic rotary joint loss analysis method based on virtual prototype was proposed. The input-output equations of light in dove prism are derived. A hybrid architecture based on ray tracing model and analytical model was employed in a homogeneous coordinate system;the angle and position deviations of collimating lens and dove prism were considered as input error in the model as well as bearing clearance and gear precision. 30 000 random samples, of which angle precision is ±100″ and position precision is ±0.01 mm, were studied. The result shows that angle error of dove prism and collimating lens must be ±1′ or less while the maximum loss is required less than 4dB, the distribution of loss P(X>3 dB) is required less than 0.5%.