| 摘要 |
A monitoring device designed primarily for monitoring movement of automotive vehicles on highways, tunnels, bridges and the like. Cables extend the length of the highway or other route being monitored which are designed to have their characteristic impedance varied by movement of vehicles in adjacent parallel paths. The cables are connected to a pulsing circuit and receiver so that the cables may be pulsed and reflections or partial reflections of the pulsed signals received and displayed on an oscilloscope which is calibrated for an A scope visual display and indication of the highway or route being monitored. The presence of automobiles or the like along the highway cause impedance mismatches on the cables which are reflected and suitably displayed. These impedance mismatches move along the display at a rate consistent with the rate of movement of the vehicles and thereby indicate visually movement or stoppage of traffic. The system is designed to be connected automatically to traffic control signals.
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