一种用于经纬仪的实时检焦系统

Real time auto-focusing system used in the theodolite

为了使经纬仪进行实时自动检调焦,提出了一种双分离透镜法检焦系统,该方法利用目标自身的反射光,经双分离透镜将通过镜头后的光路分割成两束,通过检测目标在CCD上成像光斑位置的偏移量进行调焦,对具有一定亮度的目标能理想的自动对焦,自身不需发射系统,耗能少,结构紧凑;利用相关法进行数据处理和拟合,提高了检焦系统的分辨率。实验结果表明,此方法的检焦分辨率在0.1～0.15mm范围之内,检焦精度基本满足经纬仪第一像面焦深范围之内的要求,并具有调整方便以及实时性等优点。

In order to realize the auto-examining focus in real time for the theodolite, an auto-focusing system with the reflected light of the objective itself is introduced, in which the light is split into two beams by two symmetrical lenses And the auto-focusing ability is achieved by detecting the relative offset of the image spot on the CCD. This system has lower consumption and compact structure, in which the objective with definite brightness can be auto-focused ideally With the signal processing techniques such as correlative analysis and data fitting, the resolution of the whole measuring system is improved. The experiment result demonstrates that the measuring precision ranging from 0.1mm to 0.15mm meets with the focus-depth requirements of the theodolite; and the method has the advantage of adjusting easily and higher automation