激光光纤准直系统的试验研究

On the experimental study of a laser fiber alignment system

介绍一种新的激光准直系统,该系统通过单模光纤建立新的光发射基准,从而有效地抑制了由于激光腔热变形而产生的光束漂移。另外,该系统采用了标量卡尔曼数字滤波器耒降低大气扰动和其他环境因素对测量的影响,在2.5m的测量范围内,系统稳定性可以控制在±1.5μm以下。该系统适用于作为形状误差和运动误差测量时的直线基准。

In this paper, a laser alignment system is described which em- ploys a single mode optical fiber to setup a new light emitting reference. This kind of optical arrangement can effectively eliminate the angular fluctuation of a laser beam due to the thermal distortion of a laser chamber. In order to reduce the influence of air flow disturbance and other environmental fac- tors on a laser beam, scalar digital Kalman fil- tering method is applied to lower the environmental noises. After digital fil- tering, the instability of the system can be con- trolled under ± 1.5μm within a measuring length of 2.5m. This laser alignment system is suit- able for use as a straightness datum in measuring geometric and kinematic quantities.