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Spectral and global diffuse properties of high-performance translucent sheets for energy efficient lighting and skylights
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences.
2003 In: Appl. Opt., Vol. 42, 3981-3991 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2003. Vol. 42, 3981-3991 p.
URN: urn:nbn:se:uu:diva-91671OAI: oai:DiVA.org:uu-91671DiVA: diva2:164481
Available from: 2004-04-26 Created: 2004-04-26Bibliographically approved
In thesis
1. Optical Characterisation of Miniature Structures and Translucent Sheets for Daylighting Applications
Open this publication in new window or tab >>Optical Characterisation of Miniature Structures and Translucent Sheets for Daylighting Applications
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

For a long time spectrophotometry has been a powerful method of determining optical material properties. Since the technique measures the parameters of interest, reflectance and transmittance, it is in general easy to use and interpret. Certain materials, such as miniature structures or scattering materials, must be given a more careful analysis to avoid incorrect interpretation. General solutions to measurement challenges for thick scattering samples and anisotropically scattering samples are presented.

Thorough knowledge about the components of a spectrophotometer gives a solid base which is necessary when trying to design or modify an instrument for the characterisation of miniature components. Focusing optics and pinhole apertures are two methods investigated for studying samples on a millimeter scale. Focusing optics retain a high intensity but might cause internal reflection. Pinhole apertures are easy to build into a sample holder, but they will reduce light intensity which can give problems with signal to noise ratio. Using a microscope as a focusing lens system permits the measurement of samples of a size down to the order of ten micrometers. However, absolute measurements are difficult due to the strong focusing properties of the microscope.

Translucent sheets are of interest for daylighting applications, a growing field in today's energy-conscious society. If sunlight is to be used for indoor illumination it is preferable to make it diffuse. By using Transparent Refractive Index Matched Micro (TRIMM) particles in a transparent polymer sheet, it is possible to obtain high transmittance in combination with tailorability of the scattering profile. Such sheets have been characterised experimentally, as well as by Monte Carlo raytracing simulations. The good agreement between simulation and experiment shows that this type of simulation can be used in the materials design process. A more theoretical study of patterns in multiple Mie scattering has been carried out using the Monte Carlo program developed for characterisation of the TRIMM particle sheets.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 66 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 970
Materials science, Photospectrometry, Light scattering, Optical characterisation, Materialvetenskap
National Category
Materials Engineering
urn:nbn:se:uu:diva-4235 (URN)91-554-5948-X (ISBN)
Public defence
2004-05-19, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15
Available from: 2004-04-26 Created: 2004-04-26Bibliographically approved

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