The method of estimation of background luminance in objective glare measurements

Urszula Joanna Blaszczak

doi:10.1117/12.577582

26 August 2004 The method of estimation of background luminance in objective glare measurements

Urszula Joanna Blaszczak

Proceedings Volume 5566, Optical Security and Safety; (2004) https://doi.org/10.1117/12.577582
Event: Optical Security and Safety, 2003, Warsaw, Poland

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 L_b and the influence of the errors in L_b estimation on the value of the UGR index are presented. Two methods of the background luminance measurement are described and discussed.

Citation Download Citation

Urszula Joanna Blaszczak "The method of estimation of background luminance in objective glare measurements", Proc. SPIE 5566, Optical Security and Safety, (26 August 2004); https://doi.org/10.1117/12.577582

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