| 摘要 |
<p>A vehicle monitoring system comprising an infra-red radiation transmitter (14) located on the underside of a vehicle to be monitored and an infra-red radiation receiver (18) positioned in the ground at a predetermined location in or adjacent to the path of the vehicle. The receiver (18) is connected via a fibre optic (58) to an infra-red radiation sensor, the vehicle transmitter (14) being adapted to transmit signals pertaining to the vehicle to the sensor via the receiver (18) and the fibre optic (58). The sensor is connected to a control system which interrogates and processes the signals sensed by the sensor. <IMAGE></p> |
