Road Surface Characterization by Near Infrared Light Scattering and Absorption
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Sähkötekniikan korkeakoulu |
Master's thesis
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Authors
Date
2016-10-31
Department
Major/Subject
Micro and nanotechnology
Mcode
S3010
Degree programme
EST_2
Language
en
Pages
51+5
Series
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.Description
Supervisor
Sopanen, MarkkuThesis advisor
Tuononen, AriKeywords
near infrared, scattering, absorption, friction estimation, laser diode, photodiode