using infrared light (G01N21/39 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) > Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands > Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry > using infrared light (G01N21/39 takes precedence)

Child Classifications

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• G01N 2021/3595
• G01N 21/3504 for analysing gases, e.g. multi-gas analysis
• G01N 21/3554 for determining moisture content
• G01N 21/3563 for analysing solids; Preparation of samples therefor
• G01N 21/3577 for analysing liquids, e.g. polluted water
• G01N 21/3581 using far infrared light; using Terahertz radiation
• G01N 21/359 using near infrared light
• G01N 21/37 using pneumatic detection