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 ?
In addition, the digital micro/nanomoire method using a digital grating as the reference grating has also been applied to measure micro/nanodeformation [15, 16].
In general, diffraction gratings with a lamellar configuration consist of a periodically varying boundary of the period P between two different media with refractive indices [n.sub.0] and [n.sub.i] as illustrated in Figure 1, where filling factor F, depth D, wavelength [lambda] and incident angle [[theta].sub.i] and [[theta].sub.m] the mth order diffraction angle, respectively.
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.
The work, published in Science, uses diffraction gratings with dielectric metasurfaces, in which the nanoscale structures on the surface of the gratings give tuneable polarisation control.
Products using labels decorated with diffraction gratings will generate strong visual interest on retial shelves versus non-decorated lables.
The spectrograph's diffractions gratings are from holographic masters, and their laminar groove profile provides a useful feature.
Inprentus has developed the capability to mechanically rule blazed diffraction gratings with blaze angles below 0.2 degrees.
Asokan, "Dual functional performance of fiber Bragg gratings coated with metals using flash evaporation technique," Optical Fiber Technology, vol.
Since the gratings in the work are fabricated by two-beam interference, the spatial distributions of refractive index and transmittance in the gratings can be expressed by a sinusoidal function.
A large part of these works is dedicated to decrease reflection at the multiple interfaces of the PV module: most of these structures involve submicrometric patterns, such as diffraction gratings [1-5].
In recent years, a series of solutions were proposed for solving Fiber Bragg Grating strain and temperature cross-sensitive issues, such as the adjacent double grating method [8], Long-period gratings and FBG bonding method [9], different cladding diameter fiber grating method [10], and birefringence distributed feedback (DFB) laser cavity method [11] from different applicable level; but these kinds of methods are not able to solve measurement accuracy problem about the Fiber Bragg Grating Strain Sensor used in coal mine tunnel roof rock deformation detection.