Study of Accuracy Improvement on NIR Spectral Polarimetry and Application to Image Analysis by Backscattered Light for Measurement of Friction Coefficient of Icy Road Surface

Abstract

In this paper, a back scattered light analysis was applied to quantify the slipperiness of road surface. Back scattered light spectra of water film have remarkably decreased intensity at wavelengths around 1400 nm to 1600 nm. On the other hand, in the case of ice, it becomes minimum at around 1500 nm and shows peak at 1400 nm. This phenomenon is due to the difference of the peak wavelengths of the absorption spectra of ice and water. The intensity obtained by dimensionlessizing the backscattered light at 1400 nm with a value of 1500 nm, is the highest for ice.