Communications: electrical – Vehicle detectors
Patent
1994-02-18
1995-12-19
Peng, John K.
Communications: electrical
Vehicle detectors
340665, 340666, 200 86A, 310339, 310800, G08G 101
Patent
active
054772176
ABSTRACT:
A bidirectional road traffic sensor include several respective lengths of coaxial piezoelectric cable each having a conductive core, a conductive polymer surrounding the core, a conductive sheath therearound and an electrically non-conductive jacket therearound. The cables are spliced together such that conductive core and conductive sheath of one length of piezoelectric cable is spliced respectively to the conductive sheath and conductive core of another piezoelectric cable. The splices are encapsulated in an electrically non-conductive material so that the spliced lengths of piezoelectric cables respectively constitutes positive, neutral and negative piezoelectric sensors. Pressure changes in the piezoelectric sensors are caused by vehicle passage thereover. In such a manner, electrical pulses are responsively produced by passage of vehicles traversing respective detection zones defined by the sensors and moving in respective particular directions so that such passage of such vehicles may be registered.
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International Road Dynamics
Lefkowitz Edward
Peng John K.
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