Experimental and simulation-based approaches to assess bidirectional properties of complex fenestration systems

A serious effort has been made in developing accurate and efficient bidirectional goniophotometric devices for detailed studies of Complex Fenestration Systems, capable of measuring BTDFs and/or BRDFs in an appropriate way. The existing instruments are almost all based on a scanning process, i.e. on relative individual movements of the detector and of the sample and/or the source to monitor all incoming and outgoing light flux directions for which BT(R)DF data are needed, except for two that rely on a flux-based investigation combining the use of digital imaging for detection with the collection of the light emerging from the sample on a projection surface (diffusing screen or mirrored ellipsoid). The second part of the paper focuses on virtual goniophotometers that have been developed, mainly based on commercial forward ray-tracing simulation tools and allowing one to complement experimental assessment in a very efficient way.

Presented at:
Lux Europa 2005 - Lighting for Humans, Berlin, Germany, September 19-21, 2005

 Record created 2011-03-02, last modified 2018-03-17

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