About this Engineering article
05/02726 Nano-crystal glass-ceramics obtained from high alumina coal fly ash is a Engineering article available to read on EtoBox.
experimental assessment of these bi-directional functions has been developed, based on a digital imaging detection system. An extensive set of BTDF measurements was performed with this goniophotometer on venetian blinds presenting curved slats with a mirror coating on the upper side. In this paper, the measured data are compared with raytracing results achieved with a virtual copy of the device, that was constructed with a commercial ray-tracing software. The model of the blind was created by implementing the measured reflection properties of the slats coatings in the ray-tracing calculations. These comparisons represent an original and objective validation methodology for detailed bi-directional properties for a complex system; the good agreement between the two methods, yet presenting very different parameters and assessment methodologies, places reliance both on the digital-imaging detection system and calibration, and on the potentiality of a flexible calculation method combining ray-tracing simulations with simple components measurements.
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- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0140-6701)
- Published
- 2005
- Language
- EN
- Field
- Engineering (Physical Sciences)