| 摘要 |
A road surface condition monitoring apparatus (10) includes a radiation source arrangement (150, 160) for generating radiation (170) for interrogating a road surface (100), and a detector arrangement (200, 210, 220) for receiving radiation reflected in operation from the road surface (100) to generate a corresponding reflected radiation signal (S3), and a computer arrangement (20) for receiving the reflected radiation signal (S3) for determining frictional properties of the road surface (100). The computer arrangement (20) is operable to compare the reflected radiation signal (S3, R) with a corresponding expected reflected radiation signal (Reap) for a given position for determining the frictional properties of the road surface (100). A mathematical model may be employed based on at least one of: a neural network, a physical model and a measurement database. The apparatus may include a GPS position determining arrangement. Fan and heater arrangements for the radiation tubes are disclosed to reduce blockage thereof by snow and ice. The radiation source may generate modulated radiation and the receiver may be adapted to demodulate the reflected radiation. A similar apparatus is disclosed to determine the frictional properties of a tyre surface wherein the reflected radiation signal for the tyre surface is compared with a corresponding expected reflected signal for the tyre surface.
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