Predictive algorithms for directional optical properties of coated glazing for building and automotive applications

Predictive algorithms for directional optical properties of coated glazing for building and automotive applications

van Nijnatten, P.A.
Technisch Physische Dienst TNO - TH

1999

Solar and visual light transmittance, colour appearance and other optical properties of glazing, are according to present standards specified for (near-) normal incidence. In general however, these properties are angular dependent. Realistic computation of visual light and solar energy properties therefore requires the angular behaviour to be known. The paper gives an overview of possible strategies for the development and use of algorithms for the prediction of the angular dependency of these properties. A new type of algorithm is proposed based on an 'exact' Fresnel model in which the complex Fresnel equations are replaced by more simple expressions. Different candidate expressions for this pseudo-Fresnel formalism are discussed and their results compared with the exact solution. The present work has been focused on the angular dependency of the visible light transmittance of a set of coated glazing materials which covers most of the products available today on the market. The results show that the new algorithm gives an accurate description of the angular behaviour of the optical properties of coated glazing for buildings and automotive applications. © 1999 Elsevier Science S.A. All rights reserved.

Materials
Glazing
Optical coating
Optical properties
Algorithms
Light transmission
Mathematical models
Numerical analysis
Optical coatings
Optical properties
Specifications
Spectrum analysis
Angular dependency
Coated glazing
Colour appearance
Fresnel equations
Fresnel model
Glazes

http://resolver.tudelft.nl/uuid:8307a90b-fb18-41e5-acb6-46b8ca7db1c9

https://doi.org/10.1016/s0040-6090(99)00258-8

235132

0040-6090

Thin Solid Films, 351 (1-2), 295-300

article