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monochromator

[mon-uh-kroh-mey-ter] /ˌmɒn əˈkroʊ meɪ tər/
noun, Optics.
1.
a spectroscope with a slit that can be moved across the spectrum for viewing individual spectral bands.
Also called monochromatic illuminator.
Origin
1905-1910
1905-10; monochromat(ic) + (illuminat)or
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for monochromatic illuminator

monochromator

/ˌmɒnəʊˈkrəʊmeɪtə/
noun
1.
(physics) a device that isolates a single wavelength of radiation
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for monochromatic illuminator

monochromator

instrument that supplies light of one colour or light within a narrow range of wavelengths. Unwanted wavelengths (colours) are blocked by filters (first used by Bernard Lyot in the 1930s) or bent away, as in the spectroheliograph. The monochromator is used to photograph the Sun and to study photochemical effects; it is usually a component of a spectrophotometer.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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