Sökning: "Precision measurement"

Visar resultat 21 - 25 av 214 avhandlingar innehållade orden Precision measurement.

1. 21. Applanation Resonance Tonometry for Intraocular Pressure Measurement

   Författare :Per Hallberg; Olof A. Lindahl; Anders Eklund; Christina Lindén; Per Ask; Umeå universitet; []
   Nyckelord :Physics; Resonance; applanation; tonometry; glaucoma; Goldmann; biomechanical; Intraocular; ART; Fysik; fysik; Physics;

   Sammanfattning : Elevated intraocular pressure (IOP) is one of the major risk factors for glaucoma. Since glaucoma is a leading cause of blindness, reliable methods for measuring the IOP are important. This doctoral dissertation presents a new method, applanation resonance tonometry (ART), for measurement of IOP. LÄS MER

3. 22. Quantitative cataract measurement with the Scheimpflug technique

   Författare :Wen Qian; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Scheimpflug photography; back scattered light; cataracts; human lens nuclear opacities; aqueous suspension of polystyrene spheres; standard of opacity;

   Sammanfattning : Cataract is the most prevalent blinding eye disease. Scheimpflug photography is an objective method for documentation of lens nuclear opacity. Using the Scheimpflug slit-lamp technique, a photograph, in focus from the anterior surface of the cornea to the posterior surface of the lens, can be obtained. LÄS MER

4. 23. Optical Document Security: Measurement, Characterization and Visualization : in the Light of Visual Evaluation

   Författare :Mikael Lindstrand; Björn Kruse; Sasan Gooran; Volker Lohweg; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Documents of high value, such as passports, tickets and banknotes, facilitate means for authentication. Authentication processes aim at mitigating counterfeit “passable products”. LÄS MER

5. 24. Hardware centric machine vision for high precision measurement of reference structures in optical navigation

   Författare :Xin Cheng; Benny Thörnberg; Mattias O'Nils; Mittuniversitetet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : .... LÄS MER

7. 25. An inductive gap measurement method for square butt joints

   Författare :Edvard Svenman; Anna-Karin Christiansson; Anna Runnemalm; Johan Carlsson; Högskolan Väst; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Eddy current; Seam tracking; Measurement; Laser beam welding; gap geometry; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik;

   Sammanfattning : A recent method in aero engine production is to fabricate components from smaller pieces, rather than machining them from large castings. This has made laser beam welding popular, offering high precision with low heat input and distortion, but also high productivity. LÄS MER