relative illumination meaning in English

相对照度

The reason that f - sin lens can avoid the declination of relative illumination as increase of its working area is represented . and its potential application in laser marking machine with larger working area is expected . as an example , an f - sin lens with the image height of 140mm is given
论文还介绍f - sin镜头的基本原理,指出借助f - sin镜头可以避免因工作面积扩大而造成的像面边缘照度下降,提出将其用于大工作面激光打标机的设想,并给出了设计实例。
The design results and the performance evaluation of f - theta200 and f - theta500 are given in detail . the designed lenses are simple and compact and their cost are low . the focusing performances are within diffraction limit , the relative illuminations quite uniform and the distortion relative to the f - theta linear relation small
详细给出了f - theta200和f - theta500的像质评价和研制结果,所研制的f - theta镜头具有工作面积大、结构简单紧凑、加工成本较低、聚焦性能达到衍射极限、工作面上相对照度分布均匀、能量集中度高和畸变小等优点。