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The relationships between the characteristics of a source of radiation and its final energy distribution (or image) are presented. The black-body, the inverse square law, the irradiance or illumination produced on a surface, Lambert's law, the radiance or brightness of an image, and the relationship between radiometry and photometry are discussed.
Warren J. Smith
"Elements Of Radiometric And Photometric Calculations", Proc. SPIE 0531, Geometrical Optics, (26 July 1985); https://doi.org/10.1117/12.946510
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Warren J. Smith, "Elements Of Radiometric And Photometric Calculations," Proc. SPIE 0531, Geometrical Optics, (26 July 1985); https://doi.org/10.1117/12.946510