Patent ID: 6979146

Claim:
A road surface sensor for performing automatic control for road snow-melting by measuring a snowfall and an amount of freezing as a heat quantity required for snow-melting and a heat quantity required for freezing prevention in a unit time period, measuring a state of distribution of drying, wetting, snow cover, snow cover depth, and temperature on a road surface transversely in a non-contact manner, and combining the measured heat quantities and the state of road surface, the road surface sensor comprising: a rotating stand provided so as to be reciprocatingly rotatable upward on the road surface; a snow-melting/freezing heat quantity measurement dummy road surface having an electric heater buried therein and to be used as a reference road surface for heat quantity measurement to derive a melting heat quantity for snow falling on the surface and a heat quantity required for freezing prevention; a group of sensors attached to the rotating stand so as to be rotatable together, the sensors consisting of: a reference light irradiating/reflected light receiving device; a space reflected light receiving device; a non-contact road temperature measuring device; a non-contact snow cover depth measuring device; a road surface image pickup device; and a moisture sensor, wherein the reference light irradiating/reflected light receiving device includes a reference light irradiating device for irradiating reference light and a reflected light receiving device for receiving the reflected light of the reference light from the road surface, and the reflected light receiving device separates and receives only reflected light of the reference light out of the reflected light from the road surface.