1) "Gratings" -- As to gratings
grating
Function: noun
1 : a wooden or metal lattice used to close or floor an opening
2 : a partition, covering, or frame of parallel bars or crossbars
3 : a system of close equidistant and parallel lines or bars ruled on a polished surface to produce spectra by diffraction
Pronunciation Symbols

Curb, gutter, and grating covering a storm drain
A grating is any regularly spaced collection of essentially identical, parallel, elongated elements. Gratings usually consist of a single set of elongated elements, but can consist of two sets, in which case the second set is usually perpendicular to the first (as illustrated). When the two sets are perpendicular, this is also known as a grid.

1 Gratings as filters

2 Diffraction gratings

3 Gratings as pictures

4 References

5 See also

A grating covering a drain (as illustrated) can be a collection of iron bars (the identical, elongated elements) held together (to ensure the bars are parallel and regularly spacing) by a lighter iron frame. Gratings over drains and air vents are used as filters, to block movement of large particles (such as leaves) and to allow movement of small particles (such as water or air).

A grating can also be a diffraction grating: a reflecting or transparent sheet on which there are many, fine, parallel, equally spaced grooves.
Graphs of sine, square, triangle, and sawtooth gratings. The Y axis shows luminance; the X axis shows space or distance.
A grating can also be a picture having the characteristics of a grating. For example, a picture might be of a collection of parallel black bars separated by equal-sized white bars. These sorts of gratings are described by a graph (illustrated). On the y-axis of the graph is the luminance obtained by moving a light meter over the grating perpendicular to the orientation of the grating. On the x-axis of the graph is the distance the light meter moved. The example is a square-wave grating (see second panel of the illustration); the graph consists of fla..."

Further Data On Term for gratings
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