环形光（Loop lighting）是摄影学上的术语 ：在被摄者面部的阴影部分产生环状阴影的肖像布光方式；不同于派拉蒙式或者蝴蝶光式布光，主灯位置离被摄者稍低稍远。
环形光纤 ring fiber
环形光源 Ring light source ; Ring lamp ; Ring light
环形光阑 annular diaphragm ; annular aperture ; aular diaphragm
环形光纤激光器 ring fiber laser
环形偏光镜 SLIM-CPL ; SLIM-MRC-CPL ; Circular Polarizing Filter ; CPL
环形激光陀螺仪 [激光] ring laser gyroscope ; ring laser gyro ; ring-laser gyro
环形闪光灯 Ring flash ; doughnut-shaped flash lamp
环形布光 Loop Lighting
针对膛线炮身管提出了一种基于环形光切的图像检测方法。
An image detection method based on the ring light section method was developed to measure deep holes with complex surfaces, especially rifled gun barrels.
测量系统主要由半导体激光器、环形光发生器以及CCD摄像机组成。
The measuring system consists of a laser diode, an optical ring pattern generator and a CCD camera.
本文给出了在环形光纤外腔光反馈之下半导体激光器频偏特性的小信号分析理论。
In this paper a complete small signal analysis for semiconductor laser frequency chirping in the presence of optical fiber ring feedback is presented.
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