长距离无衍射光莫尔条纹直线度测量系统的工作原理

A long-distance straightness error measuring system with diffraction-free beam

在无衍射光测量直线度系统中 ,常常采用锥透镜作为产生无衍射光的元件。要实现长距离的直线度测量 ,则必须采用大口径锥透镜 ,制造成本较高 ,整个系统体积比较大。提出一种用偏转抛物镜系统来替代锥透镜产生无衍射光束 ,可以实现大口径无衍射光束。具有成本低 ,精度较高 ,实现方法简单等优点。

Axicon is an optical element used to generate the non diffracted beam in straightness error measuring system.The large caliber axicon will be need in the long distance measuring system.A new way to generate the large caliber non diffracted beam using the deflected parabolic reflector is proposed in the paper.The characteristics and the generating method are studied and the design method of the measuring system is presented.