grating


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grating

(grāt′ing)
In spectrophotometry, the element used in a monochromator that disperses white light into the visible spectrum. It is composed of finely etched lines in the reflecting material.

grating

A series of black and white parallel bars of equal width used to measure visual acuity, contrast sensitivity, and resolution of optical systems. The grating can be either square-wave (also called Foucault grating or Foucault pattern), in which the luminance across a bar is constant, or sine-wave, in which the luminance varies sinusoidally (Fig. G6). See cycle per degree; contrast sensitivity function.
Fig. G6 Square-wave gratingenlarge picture
Fig. G6 Square-wave grating
References in periodicals archive ?
Fisher and Ludlow projects that it will produce 50,000 tons of bar grating products from the Bourbonnais facility.
A near-eye display device, comprising: an image source: a waveguide configured to propagate light from the image source to a field of view of a user of the near-eye display device, the waveguide comprising a holographic grating comprising a plurality of angularly multiplexed holograms; and a controller configured to control display of an image via the image source.
A planar echelle grating spectrometer based on a Rowland mounting is illustrated in Figure 1(a).
This equation can be written in a slightly different form using the grating number K defined for a 1D grating as K = 2[pi]/[LAMBDA].
Diffraction gratings made of polymeric materials have gained popularity in advanced optical systems (8) because they offer good performance at lower production cost when compared with their glass-made counterparts (9).
The new grating heads are especially suitable for bakery product applications.
Considering the grating of length L varying from z = 0 and L, the boundary condition leads the amplitude reflection coefficient [rho] = [S.
We are a leading producer of FRP structural shapes and fiberglass grating for use in the corrosion, industrial, electrical and construction industries.
Small castor wheels can get stuck in the dip of a gulley grating, but these are just right.
To achieve such control, the researchers first fashioned a simple grating out of stretchy plastic.