Search for dissertations about: "Optical Fibre"

Showing result 16 - 20 of 100 swedish dissertations containing the words Optical Fibre.

2. 16. Online fibre property measurements : foundations for a method based on ultrasound attenuation

   Author : Yvonne Aitomäki; Richard Challis; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Industriell elektronik; Industrial Electronics;

   Abstract : This thesis presents the foundations of a method for estimating fibre properties of pulp suitable for online application in the pulp and paper industry. In the pulp and paper industry, increased efficiency and greater paper quality control are two of the industry's main objectives. READ MORE

4. 17. Fibre Bragg Grating Components for Filtering, Switching and Lasing

   Author : Zhangwei Yu; Lars Thylén; Pierre-Yves Fonjallaz; Lin Zhang; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fibre Bragg grating; photosensitivity; apodization; chirp; phase-shift; microwave optical filtering; Electrical engineering; electronics and photonics; Elektroteknik; elektronik och fotonik;

   Abstract : Fibre Bragg gratings (FBGs) are key components for a vast number of applications in optical communication systems, microwave photonics systems, and optical sensors, etc. The main topic of this thesis is fibre Bragg grating fabrication and applications in direct microwave optical filtering, high speed switching and switchable dual-wavelength fibre lasers. READ MORE

5. 18. Whiteness and Fluorescence in Paper : Perception and Optical Modelling

   Author : Ludovic Gustafsson Coppel; Per Edström; Håkan Olin; Caisa Johansson; Markku Hauta-Kasari; Mittuniversitetet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Paper Whiteness; Fluorescence Whitening Agents; Kubelka-Munk; light scattering; paper industry applications; Colour Appearance Models; CIECAM02; Monte Carlo; Optics; Optik;

   Abstract : This thesis is about modelling and predicting the perceived whiteness of plain paper from the paper composition, including fluorescent whitening agents. This includes psycho-physical modelling of perceived whiteness from measurable light reflectance properties, and physical modelling of light scattering and fluorescence from the paper composition. READ MORE

6. 19. Identifying locally induced loads in hard rock tunnel linings by distributed optical fibre sensors

   Author : August Jansson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Distributed optical fibre sensors; Structural health monitoring; Tunnel lining experiments;

   Abstract : In an infrastructure system, tunnels enable fast means of transportation in impassable terrain or city areas. However, inspections and maintenance can be expensive due to long down time and, in hard rock tunnels, the complexity of the structure may lead to over designing. READ MORE

7. 20. All-fibre optical sensor system for chemical sensing based on fibre Bragg grating technology

   Author : Adel Asseh; KTH; []
   Keywords : ;

   Abstract : This thesis deals with the realization of an all-fibresensor system for chemical sensing through the evanescentfield, based on fibre Bragg grating technology. The advantagesof all-fibre systems are most apparent for the potential userof the system. These systems are of small size, have highmobility, and require no precision alignment. READ MORE