光环的直径不仅取决于产生它的星系的远近还与引力透镜的质量有关——质量越大光就弯曲的越厉害。
The diameter of the rings depends not only on the distance to the galaxies that caused them but also on the masses of those galaxies. The more massive they are, the more the light is bent.
主要介绍GRIN透镜在红外波段聚焦光斑直径的测量方法及误差分析。
The measurement method and error analysis method of GRIN lens focal spot diameter in IR wavelength are described.
在自聚焦透镜生产中涉及到一个重要的质量检测问题：毛坯玻璃丝的在线直径测量。
Measuring the diameter of the raw glass rod is an important problem of quality control in the process of grin lens production.
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