DICT.TW Dictionary Taiwan

 diffraction grating 名詞
 衍射柵,繞射柵,衍射光柵,繞射光柵

 Dif·frac·tion n.  Opt. The deflection and decomposition of light in passing by the edges of opaque bodies or through narrow slits, causing the appearance of parallel bands or fringes of prismatic colors, as by the action of a grating of fine lines or bars.
    Remarked by Grimaldi (1665), and referred by him to a property of light which he called diffraction.   --Whewell.
 Diffraction grating. Optics See under Grating.
 Diffraction spectrum. Optics See under Spectrum.
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 Grat·ing n.
 1. A partition, covering, or frame of parallel or cross bars; a latticework resembling a window grate; as, the grating of a prison or convent.
 2. Optics  A system of close equidistant parallel lines or bars, esp. lines ruled on a polished surface, used for producing spectra by diffraction; -- called also diffraction grating.
 Note: Gratings have been made with over 40,000 such lines to the inch, but those with a somewhat smaller number give the best definition.  They are used, e. g., to produce monochromatic light for use in optical instruments such as spectrophotometers.
 3. pl. Naut. The strong wooden lattice used to cover a hatch, admitting light and air; also, a movable Lattice used for the flooring of boats.

 diffraction grating
      n : optical device consisting of a surface with many parallel
          grooves in it; disperses a beam of light (or other
          electromagnetic radiation) into its wavelengths to
          produce its spectrum [syn: grating]