/kol"euh may'teuhr/, n.
1. Optics.
a. a fixed telescope for use in collimating other instruments.
b. an optical system that transmits parallel rays of light, as the receiving lens or telescope of a spectroscope.
2. Physics. a device for producing a beam of particles in which the paths of all the particles are parallel.
[1815-25; COLLIMATE + -OR2]

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      device for changing the diverging light or other radiation from a point source to a parallel beam. This collimation of the light is required to make specialized measurements in spectroscopy and in geometric and physical optics.

      An optical collimator consists of a tube containing a convex lens at one end and an adjustable slit at the other, the slit being in the focal plane of the lens. Radiation entering the slit leaves the collimator as a parallel beam, so that the image can be viewed without parallax.

      The collimator may be a telescope with a slit at the principal focal length of the lens. Light from the luminous source is focused on this slit by a lens of similar focal length, and the slit then serves as the luminous object of the optical system.

      In radiology, a collimator is an arrangement of absorbers for limiting a beam of X rays, gamma rays, or nuclear particles to the dimensions and angular spread required for the specific application.

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Universalium. 2010.

Look at other dictionaries:

  • Collimator — Col li*ma tor, n. 1. (Astron.) A telescope arranged and used to determine errors of collimation, both vertical and horizontal. Nichol. [1913 Webster] 2. (Optics) A tube having a convex lens at one end and at the other a small opening or slit… …   The Collaborative International Dictionary of English

  • collimator — [käl′əmāt΄ər] n. [see COLLIMATE] 1. a small telescope with cross hairs at its focus, fixed to another telescope, surveying instrument, etc. for adjusting the line of sight 2. a device that causes a beam of radiation, as light, to move as parallel …   English World dictionary

  • Collimator — Example of a particle collimator A collimator is a device that narrows a beam of particles or waves. To narrow can mean either to cause the directions of motion to become more aligned in a specific direction (i.e., collimated or parallel) or to… …   Wikipedia

  • collimator — A device of high absorption coefficient material used in collimation. * * * col·li·ma·tor käl ə .māt ər n a device for obtaining a beam of radiation (as X rays) of limited cross section * * * n. a device, used in diagnostic radiology or… …   Medical dictionary

  • collimator — n. a device, used in diagnostic radiology or radiotherapy, to produce a narrow beam of radiation by means of metallic slits that control the size of the beam from a radiation source. Many new linear accelerators use multi leaf collimators, a… …   The new mediacal dictionary

  • collimator — kolimatorius statusas T sritis Standartizacija ir metrologija apibrėžtis Optinis įtaisas lygiagrečiam elektromagnetinių bangų srauto pluoštui gauti. atitikmenys: angl. collimator vok. Kollimator, m rus. коллиматор, m pranc. collimateur, m …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • collimator — kolimatorius statusas T sritis chemija apibrėžtis Optinis įtaisas lygiagrečiam šviesos spinduliuotės srautui gauti. atitikmenys: angl. collimator rus. коллиматор …   Chemijos terminų aiškinamasis žodynas

  • collimator — kolimatorius statusas T sritis fizika atitikmenys: angl. collimator vok. Kollimator, m rus. коллиматор, m pranc. collimateur, m …   Fizikos terminų žodynas

  • collimator — noun Date: 1865 1. a device for producing a beam of parallel rays (as of light) or for forming an infinitely distant virtual image that can be viewed without parallax 2. a device for obtaining a beam (as of particles) of limited cross section …   New Collegiate Dictionary

  • collimator — noun a) An optical device that generates a parallel beam of light. Often used to compensate for laser beam divergence. b) A similar device that produces a parallel beam of particles such as neutrons …   Wiktionary

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