CPC Subgroup
G01N 21/59 Transmissivity (G01N21/25 takes precedence)
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) > Transmissivity (G01N21/25 takes precedence)
3 direct subcodes
Child Classifications
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- G01N 21/61 Non-dispersive gas analysers