Portable instrument to measure the average luminance coefficient of a road surface
MEASUREMENT SCIENCE AND TECHNOLOGY(2014)
摘要
We describe a portable instrument that measures the average luminance coefficient of a road surface, Q0, in the field. The design employs a modified integrating hemisphere with light-emitting diode lamps as light sources and a calibrated charge-coupled device luminance meter with an observation angle of 1 degrees as the detector. The diameter and weight of the hemisphere are 50 cm and approximately 8 kg, respectively. After first demonstrating proof of concept of the instrument, we calibrated the prototype with two methods and evaluated the performance by comparing its measurement results with those obtained by a gonioreflectometer for a series of samples. The performance characteristics of the instrument are appropriate for in situ Q0 measurement.
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关键词
road lighting,road surface,luminance coefficient,measurement,instrument
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