A Non-Contact Road Surface Monitoring System Using a Laser Diode
Seo-Kyung Lee · Yong-Gi Kim*
Department of Physics, Kongju National University, Kongju 314-701, Korea (Received 7 January 2013 : revised 20 February 2013 : accepted 5 March 2013)
The dependence of road conditions on the weather was observed by using a non-contact method.
Four types (asphalt, concrete, sidewalk brick, and white-painted brick) of road paving materials could clearly be distinguished by using a single laser diode. Wet and icy road conditions could be identified by analyzing the detected light beam, and the drying times of wet and frozen roads were measured. The single-wavelength technique is limited in identifying road conditions by exter- nal environmental factors such as fog, rain, spray, mist, etc., so a dual-wavelength technique was developed to remove that limitation. The dual-wavelength technique could also clearly distinguish between the four types of road-paving materials. Real road weather conditions were observed for an actual asphalt road and were clearly distinguished. Therefore, this non-contact dual-wavelength laser-diode road-weather-condition monitoring system should be applicable as a real-time road- surface-monitoring apparatus.
PACS numbers: 07.07.Df
Keywords: Road weather observation, Road paving distinction, Road weather equipment, Non-contact, Laser diode
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