Paper and board - measurement of specular gloss - 45 gloss with a parallel beam , din method ; german version en 14086 : 2003 纸和纸板.光泽度测量. 45度平行光束. din法
Paper and board - measurement of specular gloss - part 2 : 75 gloss with a parallel beam , din method iso 8254 - 2 : 2003 ; german version en iso 8254 - 2 : 2003 纸和纸板.光泽度测量.第2部分: 75度平行光束, din法
The results show that better resolution can be reached by using a gaussian beam , compared with that by using a finite - sized parallel beam 数值计算结果表明：与一定光源孔径的平行光束比较，采用高斯光束可以获得更好的横向、纵向分辨率。
The projections of field are obtained by hartmann wave - front sensor , and an estimation of physical parameter spatial distribution is realized by computerized tomography reconstruction technique 重建系统由哈特曼传感器探测平行光束穿过流场后的投影波前，采用计算机层析技术重建流场物理量的空间分布。
By using a reflector and two pentaprisms , one beam of light is separated into two parallel beams , then respectively they are received by two optical systems of the large scale photoelectric theodolite with certain imaging d - value which correspondingly represents each optic axis parallel error of these two optical systems 方法是利用一块反射镜和两块五棱镜将一束准直光束分光成两束平行光束，大型经纬仪的两个光学系统分别接收这两束平行光，两束平行光所成像的脱靶量差值即为两光学系统的光轴平行度。
