IPC Subgroup
G01N 21/41 Refractivity; Phase-affecting properties, e.g. optical path length
Introduced: January 1980
Last revised: January 2006
Full Title
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
Classification Context
- Section:
- PHYSICS
- Class:
- MEASURING; TESTING
- Subclass:
- INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
2 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- G01N 21/43 by measuring critical angle
- G01N 21/45 using interferometric methods; using Schlieren methods