CPC Subgroup
G01N 21/25 Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
Full Title
Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light (G01N3/00 - G01N19/00 take precedence) > Systems in which incident light is modified in accordance with the properties of the material investigated (where the material investigated is optically excited causing a change in wavelength of the incident light G01N21/63) > Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
7 direct subcodes
Child Classifications
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- G01N 21/27 using photo-electric detection (G01N21/31 takes precedence)
- G01N 21/29 using visual detection (G01N21/31 takes precedence)
- G01N 21/31 Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry