Relative Method of Measuring Coefficient of Luminous Intensity of Retro Reflective Devices
American Journal of Modern Physics
Volume 7, Issue 3, May 2018, Pages: 116-120
Received: May 15, 2018; Accepted: Jun. 5, 2018; Published: Jul. 7, 2018
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Eduard V. Kuvaldin, Metrology Department, S.I. Vavilov State Optical Institute, St. Petersburg, Russia
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A relative method is proposed for measuring the coefficient of retro reflective light intensity CRLI through specific coefficient of retro reflective Luminance CRL and area of controlled product. In contrast to the adopted absolute measurement method, by measuring the ratio of light intensity of retro reflective sample to illuminance on it, it is proposed to measure reflectance of retro reflective sample in a small solid angle with calculation CRLI. The proposed method allows using the same testing unit and instruments for measuring CRLI, which are used to measure the CRL road signs and road markings. That permits to significantly reduce measurement error.
Road Warning Triangles, Coefficient of Retro Reflective Light Intensity, Measurements, Reflectance, Testing Unit, Measurements Errors
To cite this article
Eduard V. Kuvaldin, Relative Method of Measuring Coefficient of Luminous Intensity of Retro Reflective Devices, American Journal of Modern Physics. Vol. 7, No. 3, 2018, pp. 116-120. doi: 10.11648/j.ajmp.20180703.12
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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