凸二次非球面反射镜的自准法检验

Autocollimating testing of convex conic aspheric surface

在反射光学系统中大多采用凸非球面,但凸非球面的加工和检验一直是比较困难的问题。利用透射凸二次非球面具有自消像差的能力,从三级像差理论出发,提出了凸二次非球面的透射式自准检验和反射式自准检验两种方案,解决了采用Hindle球检验口径过大的问题。以某型号准600R蛳C系统的凸次镜为例,分析了加工过程中的检验精度,并和Hindle球检验方法进行比较。结果表明,凸非球面的自准检验是一种切实可行的高精度检验方法。

Convex conic aspheric surface is widely used in the reflect optical instruments, but it is difficult for fabrication and testing at all times. Based on third-order aberration theory and the self-aplanatic capability of refractive aspheric surface, two testing methods of transmitting autocollimating testing and reflect autocollimating testing are suggested, avoiding the aperture of auxiliary lens is overmuch larger when the Hindle testing is applied. The testing precision of the two methods are analyzed by a example of Φ600R-C system. The difference between Hindle testing and autocollimating testing are also discussed. As a result, autocollimating testing of convex conic aspheric surface is useful and convenient for testing.