平行光管是光学实验及计量检测的重要设备。平行光管处于离焦状态将给检测结果带来诸多不良影响。文章提出斜方棱镜校准法, 利用斜方棱镜的光轴平移作用, 将平行光管的两束边缘光分别入射到同一个CCD中, 分划板成像在不同位置则说明分划板偏离物镜后焦面, 根据成像位置调整分划板位置, 实现平行光管的校准。对可能产生的误差进行了分析, 得出在增加8倍望远镜的情况下精度可以达到2″以内, 并通过实验验证了该方法的可行性和准确性。

The collimator is a significant equipment for optical experiments and measuring. Collimator defocus state will bring adverse effects in tests. Using rhombic prism to pan the optical axis, two marginal lights of the collimator are imaged in a CCD. Different reticle imaging positions show that the reticle deviates from the focal plane of objective lens. Then by adjusting the position of the reticle according to the imaging position, the collimator can be calibrated. Potential errors are analyzed, and it is concluded that the precision can reach 2″ by using a 8-power telescope, and the feasibility and accuracy of the method are verified by experiments.