Measuring Optically Complex Fenestration Systems
Most daylighting and shading systems are “optically complex” in that incident light is not transmitted specularly (in the same direction as the incident light) like transparent glass. Light is scattered: transmitting in some directions and reflecting in others; the pattern of scattering differs as the angle of incident light changes. LBNL researchers are establishing protocols for measuring and characterizing the light-scattering properties of these systems.
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Publications
2018
. "Efficient modeling of optically-complex, non-coplanar exterior shading: Validation of matrix algebraic methods." Energy and Buildings 174 (2018) 464 - 483. 
PDF (3.07 MB)
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PDF (3.07 MB)2013
. "A validation of a ray-tracing tool used to generate bi-directional scattering distribution functions for complex fenestration systems." Solar Energy 98.C (2013) 404-414. LBNL-6541E. PDF (1.82 MB)
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PDF (1.82 MB)2012
. A Practical Framework for Sharing and Rendering Real-World Bidirectional Scattering Distribution Functions. 2012. LBNL-5954E. PDF (2.03 MB)
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PDF (2.03 MB)2011
. Validation of variable resolution BSDFs in Radiance. Bartenbach L-chtLabor, 2011. PDF (4.51 MB)
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PDF (4.51 MB)2010
. "Light-scattering properties of a Venetian blind slat used for daylighting applications." Solar Energy 84.12 (2010) 2103 - 2111.
2009
. "Optical characterization of fritted glass for architectural applications." Optical Materials 31.6 (2009) 949 - 958.
2008
. "Light-scattering properties of a woven shade-screen material used for daylighting and solar heat-gain control." SPIE Optics+Photonics. San Diego, CA, 2008. LBNL-828E. PDF (1.41 MB)
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PDF (1.41 MB)2007
. "Obtaining the Bidirectional Transfer Distribution Function of Isotropically Scattering Materials Using an Integrating Sphere." Optics Communications 277 (2007) 228-236. LBNL-61826. PDF (276.23 KB)
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PDF (276.23 KB) . "NFRC Interlaboratory Comparison on Optical Properties." NFRC Conference. San Diego, CA, 2007. LBNL-501E. PDF (553.53 KB)
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PDF (553.53 KB)2005
. "Bi-Directional Transmission Properties of Venetian Blinds: Experimental Assessment Compared to Ray-Tracing Calculations." Solar Energy 78 (2005) 187-198. LBNL-58818. PDF (965.96 KB)
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PDF (965.96 KB)2003
. "Comparison Between Ray-Tracing Simulations and Bi-Directional Transmission Measurements on Prismatic Glazing." Solar Energy 74.2 (2003) 157-173. LBNL-51169.
