CPC Subgroup
G01N 21/17 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)
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)
20 direct subcodes
Child Classifications
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- G01N 21/19 Dichroism
- G01N 21/21 Polarisation-affecting properties (G01N21/19 takes precedence)
- 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
- G01N 21/41 Refractivity; Phase-affecting properties, e.g. optical path length (G01N21/21 takes precedence)
- G01N 21/47 Scattering, i.e. diffuse reflection (G01N21/25, G01N21/41 take precedence )
- G01N 21/55 Specular reflectivity
- G01N 21/59 Transmissivity (G01N21/25 takes precedence)