设计制作了一种用形状记忆合金驱动的周期可变光栅。
A period-variable grating actuated by a shape memory alloy (SMA) is designed and fabricated.
这个表达式适用于任意形状的油膜位相光栅。
This expression is suitable for oil fi-lm phase grating with arbitrary form.
矢量图形格式不像光栅图形那样把颜色赋予像素，而是用线段活几何形状描述图像。
Instead of assigning colors to pixels as we do in raster graphics, a vector-graphics format describe an image in terms of lines and geometric shapes.
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