机床实验设备名称翻译F-24-SCIdict学术词... ... 焦距计 focimeter; focometer 测焦距准直[光]管 foco-collimator 焦距计 focometer; focimeter ...
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测焦距准直[光]管 foco-collimator
测焦距准直管
A quasi-straight tube for measuring focal length
以上为机器翻译结果，长、整句建议使用 人工翻译 。
该方法借助一个焦距较长的凸透镜与被测凹透镜组成无焦系统，可以使准直管出射光束的张角发生改变；
Firstly, a telescope system is made up with a concave lens and a long-focus convex lens, by which the angle of the parallel beam from the collimator can be change.
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