by measuring critical angle

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light > Systems in which incident light is modified in accordance with the properties of the material investigated > Refractivity; Phase-affecting properties, e.g. optical path length > by measuring critical angle

CPC:

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) > Refractivity; Phase-affecting properties, e.g. optical path length (G01N21/21 takes precedence) > by measuring critical angle

Of 4 combined children, 0 exist in both systems.

4 codes are CPC-only extensions.

Note: 3 CPC extensions are marked as secondary classification only.

Child Classifications

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G01N 2021/434 2nd only CPC only CPC only
G01N 2021/435 2nd only CPC only CPC only
G01N 2021/436 2nd only +2 CPC CPC only CPC only
G01N 21/431 +1 CPC CPC only CPC only