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G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
G01N21/251—Colorimeters; Construction thereof
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FR537457D1920-11-271920-11-27Procédé et appareil pour la mesure de l'opacité et du pouvoir réfléchissant de feuilles de matières quelconques
ExpiredFR537457A
(fr)