基于双五棱镜组件的大间距光轴平行性检测方法

Detection method of large space optical axis parallelism based on double pentaprism components

光轴平行性是多光轴光电设备的重要参数,对其进行检测十分必要。随着光电设备复杂程度的逐步增加,其光轴之间的距离不断增大,传统的小口径检测手段已经不能满足现有光电设备的检测需求。针对大间距光轴之间的平行性的检测,设计了一种基于双五棱镜结构的扩径组件,实现了平行光管的出射光束的平移,并利用双光楔结构对扩径组件进行修正,将平行光管的有效口径由300 mm扩展至1 200 mm。对扩径组件进行数学建模分析和实际装调,并对检测系统进行整体精度测试。实验结果表明:平行光管出射的光束经扩径组件后能够保持良好的平行性,其平行误差在11″以内,满足大间距光轴检测的精度要求。

The optical axis parallelism was an important parameter for the multi optical axis optoelectronic device. It was very necessary to detect the parallelism. With the gradual increase in the complexity of optoelectronic devices, the distance between optical axes was increasing. The traditional small aperture detection methods could no longer meet the requirements of existing photoelectric devices.In order to detect the parallelism between large space optical axis, a expanding component based on double pentaprism structure was designed to realize the translation of the beam emitted from the collimator, and the error of the expanding component was modified by double wedge structure. The effective aperture of the collimator was extended from 300 mm to 1 200 mm. Mathematical modeling analysis and actual adjustment of the expanding component were carried out and the precision experiment was done. The experimental results of the detecting system show that the beam emitted by the collimator could maintain good parallelism after expanding. The parallelism deviation is within 11 ″, which could meet the precision requirements of large space optical axis detection.