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Publication of BE792026ApublicationCriticalpatent/BE792026A/en
G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
G01N21/455—Schlieren methods, e.g. for gradient index determination; Shadowgraph
G—PHYSICS
G01—MEASURING; TESTING
G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
G01B11/00—Measuring arrangements characterised by the use of optical techniques
G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
G—PHYSICS
G01—MEASURING; TESTING
G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
G—PHYSICS
G01—MEASURING; TESTING
G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
G01N21/84—Systems specially adapted for particular applications
G01N21/88—Investigating the presence of flaws or contamination
G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
G01N21/896—Optical defects in or on transparent materials, e.g. distortion, surface flaws in conveyed flat sheet or rod
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Physics & Mathematics (AREA)
General Physics & Mathematics (AREA)
General Health & Medical Sciences (AREA)
Chemical & Material Sciences (AREA)
Analytical Chemistry (AREA)
Biochemistry (AREA)
Life Sciences & Earth Sciences (AREA)
Health & Medical Sciences (AREA)
Immunology (AREA)
Pathology (AREA)
Engineering & Computer Science (AREA)
Textile Engineering (AREA)
Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Investigating Or Analysing Materials By Optical Means (AREA)
BE792026D1971-12-031972-11-29 METHOD AND DEVICE FOR DETERMINING THE ABILITY OF A TRANSPARENT MATERIAL TO BECOME THE LIGHT RAYS THROUGH ITBE792026A (en)