Laser-ultrasonic measurement of elastic properties of a thin sheet and of tension applied thereon
CA 2348381 A1 · Owner: Blouin, Alain · Inventors: Blouin, Alain; Reid, Benoit; Monchalin, Jean-Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and an apparatus for non-contact and non-invasive characterization of a, moving thin sheet and in particular of a paper web on a production line. The method uses, a laser for the generation of sonic and ultrasonic waves in the thin sheet and a speckle, insensitive interferometric device for the detection of these waves. The generation is, performed in conditions to avoid damage impeding further use of the sheet. When the, generation and detection spots overlap the method provides a measurement of , the compression modulus. When the generation and detection spots are separated by a, known distance and plate waves (Lamb waves) are generated and detected the , method, provides a …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed November 3, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 3, 2021.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.