The centroid position of the focal spot directly depending on intensity distribution and phase slope distribution of near field is derived and its physical meaning is described.
进一步推导了焦斑质心位置对光束近场强度分布和相位斜率分布的依赖关系式，并对该式清晰的物理意义进行了阐述。
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。
Can focus sunlight in the focal plane, the formation area of different sizes and brightness of different focal spot.
可以把太阳光聚焦在焦面内，形成面枳大小不同和亮度不同的焦斑。
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