Spectroradiometers are devices designed to measure the spectral power distribution of a source. From the spectral power distribution, the radiometric, photometric, and colorimetric quantities of light can be determined in order to measure, characterize, and calibrate light sources for various applications. Spectroradiometers typically take measure...
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http://en.wikipedia.org/wiki/Spectroradiometer
instrument for measuring radiometric quantities in narrow wavelength intervals over a given spectral region
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=845-05-07
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