光电系统光轴与机械轴同轴度测试方法

同轴度是光学系统的重要技术指标。目前比较先进的方法是利用激光准直方法测量同轴度,但其仅仅认为同轴度属于二维的范畴,忽略了其三维空间性,即在三维空间里水平与俯仰方向同轴度之间的相互影响。因此,提出一种基于三维空间建模的方法,对同轴度进行测试。首先,建立机械轴与光轴的空间关系模型;其次,定位光斑质心;再次,对获得的光斑图像坐标,进行圆轨迹拟合;最后,将光斑圆轨迹上的任一点坐标代入到光轴与机械轴的旋转模型,即可获得二者的同轴度。实验结果表明:俯仰偏转角度对水平偏转角度的影响不可忽略,该方法使水平方向的同轴度测量精度得到显著提高。此方法对于同轴度的评估具有十分重要的应用价值。

Artillery Coaxial Precision Test Method

Coaxial degree is an important technical index of optical system. At present, the advanced method is to use the laser collimation method to measure the coaxial degree,But it is only considered that the coaxial degree belongs to two-dimensional category, ignore its three-dimensional space, the mutual influence between horizontal and pitching di-rection in three dimensional space,therefore,this paper proposes a method based on 3D space modeling to test the co-axial degree. First of all, the establishment of the mechanical axis and the optical axis of the spatial relation model;secondly, facula centroid location;thirdly, the coordinates of spot images are obtained, circular trajectory fitting;final-ly,the circular spot trajectory coordinates of an arbitrary point substitution to the optical axis and mechanical axis of ro-tation model, will be awarded two coaxial precision. The experimental results show that:the influence of pitch angle on horizontal deflection can not be ignored, the accuracy of the coaxial degree measurement in horizontal direction is significantly improved. Therefore,this method has very important application value for the evaluation of the coaxial degree.