这束平行光的直边衍射花纹与光斑本底叠加的结果在观察屏上形成为通常所称的M线。
The straight-edge diffraction of this parallel beam superposing on the light spot constitutes the so-called M-line.
系统中两块编码光栅用透镜互相成倒像，被测物置于其间并且也用透镜成像于观察屏上。
In the system two coded gratings are inversely imaged to each other by a lens, and the tested phase object is placed between and imaged onto an observation screen.
而后用图像通过滤波器来观察，即所谓的视差屏障（parallax barrier），其实主要就是一个划有很多垂直狭缝的观察屏。
The images are then viewed through a kind of filter--called the parallax barrier--that essentially is a screen with a bunch of vertical slits in it.
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