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 ?
PGIF is also targeting steel fabricators who cannot fabric ate in-house but still need miscellaneous items such as platforms and gratings to be part of their end products.
Both lenses and diffraction gratings bend light at different wavelengths to different extents, what scientists call "chromatic aberration," that can be overcome in conventional optics through use of a series of lenses that correct for that.
For example, in display devices that utilize a light source including red, green and blue light sources, a waveguide may include three layers of light input and output gratings, each layer corresponding to a different wavelength of light.
Shimadzu Corporation will produce customized gratings in accordance to customer requests for specific coating properties, and substrate and external shapes, for the production of gratings with the desired, highly specific characteristics.
Overall it appears that diffraction gratings can potentially be used to identify food contact packaging effectively and economically; however, they are not yet ready for use commercially until a full industry-wide solution has been developed and commercialised," added Morrish.
The present study compares contrast sensitivity to vertical linear and circular concentric sine-wave gratings in young and older adults.
Particularly, due to the small facets of gratings using silicon nanophotonic platform, it is difficult to reduce the noise floor to below 25 dB [7,8].
The error introduced by this assumption is particularly severe for shallow gratings and for large angles of incidence.
The two-dimensional (2D) structure consists of metal gratings placed on top of a grounded dielectric slab with a relative permittivity [[epsilon].
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).
Headwall Photonics' reflective gratings are constructed using a holographic process that generates precise grooves and minimizes scattered light in the final product.