Uncertainty Budget for Calibration of Luminance Meters for Measurement of Photopic Adaptation Luminance of Road Tunnels

The present paper represents uncertainty budget for calibration of luminance meters for road tunnels. There are several types of luminance meters calibrations which have different advantages and calibration setups. A description of the configuration for performance of calibrations of luminance meters used in TU Sofia is presented. The specific factors and their contribution in the mathematical model of the combined uncertainty for the used calibration method are observed. The calibration value is valid for the described measurement geometry and the proposed mathematical model. Conclusions are made for the different factors included in the uncertainty budget.

I. Introduction

Tunnel lighting design is based on requirements for driver’s task, visual field of the driver, visibility and visual adjustment. The tunnel related zones, according CIE 88:2004 [1], have to be determined in order to define the longitudinal lighting level at daytime lighting: the access zone, the entrance (threshold) zone, the transition zone, the interior zone and the exit zone, Fig. 1 [2]. Fig. 1

Tunnel related zones [2]: X-distance; Y-luminance; 1-Entrance; 2-Exit; 3-Tunnel length; 4-Free zone; 5-Access zone; 6-Entrance (threshold) zone; 7-Transition zone; 8-Interior zone; 9-Exit zone