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Research and development on image luminance meter of road tunnel internal and external

도로터널 내/외부의 영상휘도 측정기 연구개발

  • Received : 2014.11.26
  • Accepted : 2015.01.05
  • Published : 2015.01.31

Abstract

This paper introduces the development of imaging luminance meter which measures the luminances of external/internal road tunnel. The developed imaging luminance meter complies with both L20 method and Veiling luminance method of the international standards, CIE88. In this paper the L20 method is mainly presented because most of tunnels currently adapt L20 method. The developed system has an embedded computer to operate at stand-alone. The system has a ethernet port, a heater, a fan, a defroster, a wiper and sun shielder. Compensation algorithm is applied for correcting non-linear responses to the luminance and integration time. The accuracy of measurement is less than 1% when it calibrated at the public certification institute. The developed system was also tested at the real field, road tunnel. The test results were very similar with the reference luminance meter and showed that the developed system operates well at the real field. Partial sensor saturations were happened to show the less luminance, because there were the high reflecting objects in the real field. Further study should be followed for high luminance measurement.

Acknowledgement

Supported by : 국토교통과학기술진흥원

References

  1. Commission Internationale de l'Eclairage (2004), "Guide for the lighting of road tunnels and underpasses." CIE 88:2004 2nd edition, pp. 26-28
  2. Korea Agency for Technology and Standards (2010), "Recommendation for Lighting of Traffic Tunnels.", KS C 3703:2010, pp. 2-14