Create a Directional Light and then place It'similar to the image below.

建立一盏平行光,如下图所示放置.

互联网

Two kinds of convex lens which make parallel rays converge to the focal point are given.

本文给出两种能使平行光严格聚焦于一点的凸透镜.

互联网

A regular cone, considered as set behind a coarse grating with another object to be measured.

将一称为高标的正圆锥与被测物一起置于粗光栅之后,平行光照明,远场拍照.

互联网

Telecentric operation ( field rays leave parallel to optical axis, unlike Barlow lenses which diverge rays ).

远心手术 ( 场射线离开平行光轴, 不像巴卢镜片,其中发散射线 ).

互联网

Then the fiber collimator is used to acquire parallel beam with appropriate diameter.

单模光纤后接光纤准直器能得到我们所需要的合适光斑直径的平行光.

互联网

All of those provide necessary basis for the research and design of Cassegrain structure col limator.

为卡塞格林结构式平行光管的研究、设计提供了必要的依据.

互联网