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Optical Characterisation of Miniature Structures and Translucent Sheets for Daylighting Applications
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences.
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. , p. 66
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 970
Keyword [en]
Materials science, Photospectrometry, Light scattering, Optical characterisation
Keyword [sv]
Materialvetenskap
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-4235ISBN: 91-554-5948-X (print)OAI: oai:DiVA.org:uu-4235DiVA, id: diva2:164487
Public defence
2004-05-19, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15
Opponent
Supervisors
Available from: 2004-04-26 Created: 2004-04-26Bibliographically approved
List of papers
1. Optical properties of injection moulded subwavelength gratings
Open this publication in new window or tab >>Optical properties of injection moulded subwavelength gratings
In: Opt. ExpressArticle in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-91669 (URN)
Available from: 2004-04-26 Created: 2004-04-26Bibliographically approved
2. Microscopic spectrophotometry applied to quasifractal gold particle clusters
Open this publication in new window or tab >>Microscopic spectrophotometry applied to quasifractal gold particle clusters
Show others...
2000 In: in Proceedings of SPIE, Vol. 4103, p. 98--105Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-91670 (URN)
Available from: 2004-04-26 Created: 2004-04-26Bibliographically approved
3. Spectral and global diffuse properties of high-performance translucent sheets for energy efficient lighting and skylights
Open this publication in new window or tab >>Spectral and global diffuse properties of high-performance translucent sheets for energy efficient lighting and skylights
2003 In: Appl. Opt., Vol. 42, p. 3981-3991Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-91671 (URN)
Available from: 2004-04-26 Created: 2004-04-26Bibliographically approved
4. Directional and angle-resolved optical scattering of high-performance translucent sheets for energy efficient lighting and skylights
Open this publication in new window or tab >>Directional and angle-resolved optical scattering of high-performance translucent sheets for energy efficient lighting and skylights
In: Appl. Opt.Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-91672 (URN)
Available from: 2004-04-26 Created: 2004-04-26Bibliographically approved
5. Experimental and Monte Carlo analysis of multiple Mie scattering
Open this publication in new window or tab >>Experimental and Monte Carlo analysis of multiple Mie scattering
In: Opt. Comm.Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-91673 (URN)
Available from: 2004-04-26 Created: 2004-04-26Bibliographically approved
6. Angle-dependent light scattering in materials with controlled diffuse solar optical properties
Open this publication in new window or tab >>Angle-dependent light scattering in materials with controlled diffuse solar optical properties
Show others...
2004 (English)In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 84, no 1-4, p. 427-439Article in journal (Refereed) Published
Abstract [en]

Light scattering plays a prominent role in a wide range of energy-efficient materials and solar applications. Some examples are materials for daylighting, diffusely reflecting sunscreens, foils for radiative cooling and nanocrystalline solar cells. Measurements of the angular profile of light scattering are very useful for obtaining a detailed characterization of the light scattering mechanisms. We review recent theoretical results on the forward and backward light scattering profiles. Forward scattering is of major importance for novel pigmented polymeric daylighting materials. Measurements of scattering profiles are in good agreement with Mie theory. Backscattering profiles from highly diffusely reflecting paints containing titanium oxide-based pigments have also been measured. It seems that scattering from the paint surface dominates at low pigment volume fractions. Results for paints with high pigment volume fractions are interpreted in terms of coherent backscattering effects from the pigment particles.

Keyword
Light scattering, Angle-dependence, Daylighting
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-91674 (URN)10.1016/j.solmat.2004.02.048 (DOI)
Available from: 2004-04-26 Created: 2004-04-26 Last updated: 2017-12-14Bibliographically approved
7. Light trapping in translucent samples and its effect on the hemispherical transmittance obtained by an integrating sphere
Open this publication in new window or tab >>Light trapping in translucent samples and its effect on the hemispherical transmittance obtained by an integrating sphere
2003 In: in Proceedings of SPIE, Vol. 5192, p. 91-100Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-91675 (URN)
Available from: 2004-04-26 Created: 2004-04-26Bibliographically approved
8. Optical characterisation of anisotropically scattering samples using an integrating sphere in combination with a diffusing film
Open this publication in new window or tab >>Optical characterisation of anisotropically scattering samples using an integrating sphere in combination with a diffusing film
Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-91676 (URN)
Available from: 2004-04-26 Created: 2004-04-26 Last updated: 2010-01-13Bibliographically approved

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