光学缺陷检测技术，对热连铸坯表面缺陷而言，具有高速、非接触、高分辨率等优点。
The optical inspection technology of surface defect, as for defects of hot continuous casting slabs, has advantages of high speed, contactless and high resolution.
散光有折射缺陷的透镜或其它光学系统，阻碍光线汇聚于一个焦点，形成一个模糊或不完全的图象。
A refractive defect of a lens or other optical system that prevents light rays from converging at a single point resulting in a blurred or imperfect image.
利用光子晶体的缺陷可以实现引导电磁波的目的，可以制作各种各样性能优异的光子晶体光学器件。
We can use the defect in the photonic crystal to guide the electromagnetic wave, and this photonic crystal with defect can be used to make photonic crystal devices.
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