Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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21/00
Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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G01N21/84
Systems specially adapted for particular applications
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G01N21/88
Investigating the presence of flaws or contamination
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G01N21/89
in moving material, e.g. running paper or textiles
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G01N21/892
characterised by the flaw, defect or object feature examined
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G01N21/896
Optical defects in or on transparent materials, e.g. distortion, surface flaws; in conveyed flat sheet or rod
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G01N2021/8967
Discriminating defects on opposite sides or at different depths of sheet or rod
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