By infrared thermal imaging techniques in this thesis, the focal spot size and focal length of this dielectric lens antenna are measured.
本论文应用红外热成像技术，对毫米波介质透镜天线的焦斑焦距进行了测量。
2
Once you choose a lens whose focallength is closest to the focallength required by your imaging system, you need to adjust the working distance to get object under inspection in focus.
一旦你选择一个镜头其焦距是最接近于你成像系统所需之焦距，你需要调较工作距离去获取观察目标物的焦点。
3
The general expressions of the ground resolution and the telescope focallength for an imaging spectrometer were deduced to investigate the increase of energy integral time with motion compensation.