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Proceedings Paper

The method of estimation of background luminance in objective glare measurements
Author(s): Urszula Joanna Blaszczak
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Paper Abstract

Human eye is able to change its sensitivity to light in the process of adaptation. Still the process of vision can be accompanied by inconvenient phenomena, e.g. glare. The newest European norms recommended the CIE Unified Glare Rating method to estimate glare. A condition of practical realization of this method is the knowledge of the luminance distribution in the room. The best detection method is to use a CCD camera, which allows to evaluate all the quantities needed to calculate the UGR index: the background luminance, the luminance of the luminous parts of each luminaire at the observer's eye, the solid angle of the luminous parts of each luminaire and the position index for each luminaire. In the paper a definition of the background luminance Lb and the influence of the errors in Lb estimation on the value of the UGR index are presented. Two methods of the background luminance measurement are described and discussed.

Paper Details

Date Published: 26 August 2004
PDF: 5 pages
Proc. SPIE 5566, Optical Security and Safety, (26 August 2004); doi: 10.1117/12.577582
Show Author Affiliations
Urszula Joanna Blaszczak, Bialystok Univ. of Technology (Poland)


Published in SPIE Proceedings Vol. 5566:
Optical Security and Safety
Zbigniew Jaroszewicz; Ewa Powichrowska; Mariusz Szyjer, Editor(s)

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