What does grating mean?

The optical device consisting of a large number of parallel slits of equal width and spacing is called a grating.

The earliest grating was made in 1821 by the German scientists J. Fraunhofer with a fine metal wire in close rows around two parallel screws. Because of the shape of the fence, so called "grating".

Modern grating is a precision engraving machine in the glass or metal sheet engraved. Gratings are the core component of a grating spectrograph, and there are many types of gratings.

Generally used grating is made by engraving a large number of parallel indentations on a sheet of glass, the indentations are impervious to light, and the smooth part between the two indentations can transmit light, equivalent to a slit.

Expanded information

Grid classification

Divided into 3D stereo grating, scale, safety grating, replica grating, holographic grating, reflective grating, transmission (diffraction) grating. Basically are composed of a series of parallel slits of equal width and equal spacing, often engraved with more than N engraved marks on the length of 1 millimeter.

Incised marks at the opaque, not engraved at the light transmission, we call the transmission grating, another grating is a reflective grating, some of the need for special coating treatment, according to this yin and yang effect evolved more graphic mirrors, gobo mirrors, etc., the simple principle of a flashlight on the finger projected onto the opposite wall to see the graphics.

Just one is a shimmering one is made of macro light. As if carving on the hair, the difficulty of the process is different. According to the use of light is transmitted or reflected into the transmission grating, reflective grating.

According to its shape is divided into flat grating and concave grating. In addition, there are holographic grating, orthogonal grating, phase grating, dazzling grating, step grating and so on.

Baidu Encyclopedia - Gratings