collimator

Definitions

  • WordNet 3.6
    • n collimator optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam
    • n collimator a small telescope attached to a large telescope to use in setting the line of the larger one
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Webster's Revised Unabridged Dictionary
    • Collimator (Astron) A telescope arranged and used to determine errors of collimation, both vertical and horizontal.
    • Collimator (Optics) A tube having a convex lens at one end and at the other a small opening or slit which is at the principal focus of the lens, used for producing a beam of parallel rays; also, a lens so used.
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Century Dictionary and Cyclopedia
    • n collimator A fixed telescope with a system of wires at its focus, and so arranged that another telescope can readily be brought into collimation with it, when an observer at the eyepiece of the latter can look into the objective of the former and see the cross-wires or slit in its focal plane. The intersection of the wires of the collimator is used as a standard point of reference.
    • n collimator The receiving telescope of a spectroscope, consisting of a slit through which the light enters, and a tube with a lens at its extremity which causes the rays to fall upon the prism or grating in parallel lines.
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Chambers's Twentieth Century Dictionary
    • n Collimator a subsidiary telescope used to detect errors in collimation, when adjusting for transit observations
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Etymology

Chambers's Twentieth Century Dictionary
L. collimāre for collineāre, to bring into line with—col, together, linea, a line.

Usage

In literature:

The collimator and observing telescope have an aperture of 25 mm., focus of 200 mm.
"Astronomical Instruments and Accessories" by Wm. Gaertner & Co.
Whenever the position is changed, the mirrors have to be re-collimated.
"Photographs of Nebulæ and Clusters" by James Edward Keeler
This lens was called the "Collimating" lens.
"The Progress of Invention in the Nineteenth Century." by Edward W. Byrn
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In news:

Flexible Collimation technology improves cardiovascular X-ray imaging.
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In science:

The end of the collimator with the 152Eu source was positioned 5 mm above the aluminium cryostat.
Characterization of the first true coaxial 18-fold segmented n-type prototype detector for the GERDA project
The straw under testing was blown through with gas mixture ArCO2 (70/30) and irradiated by the 55Fe source through the slit collimator placed perpendicularly to the straw anode.
Development of High Granulated Straw Chambers of Large Sizes
The beam focusing elements, downstream of the target, were large magnets, designed to collimate the positively charged secondary particles, while deflecting the negatively charged particles away from the beam axis.
Study of accelerator neutrino interactions in a liquid argon TPC
This amounts to supposing that light remains collimated in the medium .
Higher Order Statistsics of Stokes Parameters in a Random Birefringent Medium
The measurements were made with a scintillator tile exposed to collimated 90Sr electrons.
An Improved Shashlyk Calorimeter
The injected magnetic fields are not force-free and interact with the ambient medium to form a self-collimated jet.
Constraining the Nature of X-ray Cavities in Clusters and Galaxies
These fields then launch a magnetic tower, self-collimate the jet and subsonically expand a lobe structure close to the point where the background gas pressure starts to quickly drop beyond the core radius.
Constraining the Nature of X-ray Cavities in Clusters and Galaxies
The chosen configuration for each output beam to image the field on a 1K×1K detector with 25 microns pitch is a 3-off axis mirror collimator (concave – convex – concave), to make a compact system, with the three mirrors having a common axis (Fig. 5).
The Molecular Hydrogen Explorer H2EX
However, this collimating system is limiting the final image quality, which is estimated by the Strehl ratio map shown in Fig. 6.
The Molecular Hydrogen Explorer H2EX
The chip is mounted on the beam line, behind a 1-inch diameter collimator, and the terminals of two test transistors (one pMOSFET and one n-MOSFET) are connected to a semiconductor parameter analyser so that the transistor characteristics could be measured in-between irradiation steps.
A Sensor with Analog and Digital Pixels in 0.15 micron SOI Technology
The collimator aperture can be remotely adjusted in two orthogonal directions in order to have the desired X–ray beam size.7 In addition to the X–ray imaging detector, a cooled HPGe detector and a position sensitive (2 mm) scintillator detector are available.
Focusing of gamma-rays with Laue lenses: first results
Also collimated outflows (jets) can play a role.
The evolution of planetary nebulae. V. The diffuse X-ray emission
Alternatively, the low X-ray luminosity of NGC 7027 might be related to the presence of bipolar collimated outflows fou nd by Cox et al. (2002).
The evolution of planetary nebulae. V. The diffuse X-ray emission
For the PDS, which is a simple collimated phoswich detector, we selected the fixed rise-time spectrum.
A Simple Comptonization Model
To study systematic effects due to lateral leakage of the showers, samples are also generated with a beam spread uniformily over the ECAL front face. A Gaussian momentum dispersion consistent with the settings of the beam collimators is applied for each run.
Response of the CALICE Si-W Electromagnetic Calorimeter Physics Prototype to Electrons
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