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Inversion of two-flux and four-flux radiative transfer models for determining scattering and absorption coefficients for a suspended particle device
Univ Politecn Salesiana, Dept Ingn Elect, Guayaquil, Ecuador;Univ Carlos III Madrid, Dept Tecnol Elect, Grp Displays & Aplicac FotOn, C Butarque 15,E28911, Madrid, Spain.
Univ Politecn Salesiana, Dept Ingn Elect, Guayaquil, Ecuador.
Univ Politecn Salesiana, Dept Ingn Elect, Guayaquil, Ecuador.
Univ Carlos III Madrid, Dept Tecnol Elect, Grp Optoelect & Tecnol Laser, C Butarque 15,E28911, Madrid, Spain.
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2019 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 58, no 32, p. 8871-8881Article in journal (Refereed) Published
Abstract [en]

Intrinsic and extrinsic scattering and absorption coefficients of a suspended particle device (SPD) smart window sample at dark and dear appearance states-without and with applied electrical voltage, respectively-were determined by means of the Maheu, Letoulouzan, and Gouesbet four-flux (intrinsic) and Kubelka-Munk two-flux ( extrinsic) radiative transfer models, respectively. Extrinsic values were obtained from fitting to the two-flux model taking into account the predominantly forward scattering of the SPD. As an approximation, the Fresnel reflection coefficients were integrated out to the critical angle of total internal reflection in order to compute diffuse interface reflectances. Intrinsic coefficients were retrieved by adding a new proposed approximation for the average crossing parameter based on the collimated and diffuse light intensities at each interface. This approximation, although an improvement of previous approaches, is not entirely consistent with the two-flux model results. However, it paves the way for further development of methods to solve the inverse problem of the four-flux model.

Place, publisher, year, edition, pages
OPTICAL SOC AMER , 2019. Vol. 58, no 32, p. 8871-8881
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-398975DOI: 10.1364/AO.58.008871ISI: 000496163200020OAI: oai:DiVA.org:uu-398975DiVA, id: diva2:1377339
Available from: 2019-12-11 Created: 2019-12-11 Last updated: 2019-12-11Bibliographically approved

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Niklasson, Gunnar A.

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