Web inspecting method and apparatus

A web e.g. a fibre web as used in the manufacture of textiles is inspected e.g. for thickness uniformity or the like by transillumination, where the web is subject to ambient illumination, the transillumination being effected in modulated fashion whereby to distinguish measuring illumination from am...

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Bibliographic Details
Main Authors BRUNNSCHWEILER, DAVID, SWIFT, DAVID WILLIAM, HENDERSON, NEIL RUTHERFORD
Format Patent
LanguageEnglish
French
German
Published 25.07.1990
Subjects
COLORIMETRY
CONVEYING
HANDLING THIN OR FILAMENTARY MATERIAL
HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT
MEASURING
PACKING
PERFORMING OPERATIONS
PHYSICS
RADIATION PYROMETRY
STORING
TESTING
TRANSPORTING
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Summary:A web e.g. a fibre web as used in the manufacture of textiles is inspected e.g. for thickness uniformity or the like by transillumination, where the web is subject to ambient illumination, the transillumination being effected in modulated fashion whereby to distinguish measuring illumination from ambient illumination. Modulation may be effected by time-chopping a beam or by a narrow spectral band filter to improve signal-to-noise ratio.
Bibliography:Application Number: EP19900300151