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 specially adapted for particular applications > Investigating the presence of flaws or contamination > characterised by the material or shape of the object to be examined (G01N21/89 - G01N21/91, G01N21/94 take precedence)