step filter

• 阶梯滤光片

step filter的用法和样例：

例句

1. A satisfactory approximation to monochromatic light can be obtained with a filter placed in front of the arc.
   在碳弧前面放一个滤光片就可以得到令人满意的近单色光。
2. This article firstly advances the designing of a wide wave band polarization rotator by using Polarization Interference Filter.
   首次提出了基于偏振干涉滤光片设计方法的宽波带偏振方向旋转器。