focal point distance注视距离
focal l distance焦距
focal film distance释义焦点胶片距离
focal skin distance焦点皮肤距离
Focal l distance of lens透镜焦距
focal l distance of objective物镜焦距
front vertex focal distance前顶焦距;前顶点焦距;前表面镜
Focal distance length焦距长度
equivalent focal distance等效焦距
A kind of new way to measure optical system focal distance automatically is proposed, which is based on CCD optical-electrical method and digital image processing method.
提出了一种基于CCD光电法和数字图像处理方法自动测量光学系统焦距的新方法。
参考来源 - 基于CCD的光学系统焦距自动测量技术Met down does the further research regarding the flaw examination radio station and the repair radio station to indicate the different cutting focal distance with cut the energy all to have the different effect regarding the repair different flaw.
接下来对于点缺陷的检验机台及其修复机台作了进一步的研究表明不同切割焦距与切割能量对于修复不同的缺陷都有不同的效果。
参考来源 - TFTN（名词） the distance from the focal point of a lens or mirror to the reflecting surface of the mirror or the centre point of the lens 焦距