Road Surface Characterization by Near Infrared Light Scattering and Absorption

Abstract

This work is dedicated to creation of a non-contact optical sensor for tire-road friction estimation based on near-infrared radiation scattering and absorption in the case of different road conditions. Here we present implementation of such a sensor based on different detector response to backscattered light from the asphalt surface in four possible conditions: dry, wet, snowy and icy. We discuss light-matter interaction behind the chosen methodology, describe such a sensor prototype and its optical and electric components, perform experimental evaluation of sensor's ability to distinguish these surface types and compare experimental results to computer simulations. Theory, experiment and simulations come in agreement and the road conditions can be determined with the sensor. Additionally, ideas of sensor improvement and further perspectives are discussed.