新型旋转激光扫描系统轴系调整与误差标定

Axis alignment and error analysis of a novel rotating laser-scanning system

旋转激光扫描系统是一种基于精密转台结合多路激光的空间多目标并行角度传感系统。为改善系统光源性能,设计了一种采用光纤从外部导入光源的新型轴系结构。但是当激光以一定角度穿过中空的转轴进入镜组后,若倾斜入射柱镜,将导致出射的扫描光面型发生变化。针对此问题,研究了一种基于平行线的传递性的激光光轴姿态的调整方法,并借助激光跟踪仪测量平台,分别对光轴与转轴轴系进行拟合,建立了对光轴倾斜误差的标定方法。实验结果表明,调整后光轴与转轴轴线的空间夹角优于0.15°,完全满足扫描光截面中心直线度对激光入射柱镜的角度要求。该调整方案可用于系统的装配环节,使扫描光更加接近理想平面,有助于系统测量精度的提升。

The rotating laser-scanning system is a spatial multi-target parallel angle sensing system,which is based on a precision turntable and combined with multiple lasers.To improve the performance of the sys⁃tem's light source,a new type of axis structure was designed that uses optical fibers to import light sources from the outside.However,when the laser passes through the hollow rotating shaft and enters the reflector group at a certain angle,if the incident cylindrical lens is tilted,the scanning light surface pattern will change.To address this problem,a method for adjusting the attitude of the laser optical axis based on the transmissiv⁃ity of parallel lines was studied.With the help of a laser tracking measurement platform,individual fittings were performed for the optical axis and the rotational axis system.A calibration method for the tilt error of the optical axis was established.The experimental results demonstrate that the spatial angle between the ad⁃justed optical axis and the rotational axis exceeds 0.15°,fully satisfying the angular requirements for laser in⁃cidence on the cylindrical lens in terms of the central linearity of the light cross-section.This adjustment scheme is applicable to the assembly phase of the system,enabling the scanned light to approach an ideal plane more closely.This contributes to the enhancement of the system's measurement accuracy.