Communications: electrical – Vehicle detectors
Patent
1992-12-18
1996-01-23
Swarthout, Brent A.
Communications: electrical
Vehicle detectors
340934, 340940, 340666, 73146, G08G 101
Patent
active
054868203
ABSTRACT:
A traffic sensor including piezoelectric sensors having different polarities in different lanes of the roadway so that traffic data for different lanes of a roadway may be discriminated from the polarity of the received signal(s). Preferably, the piezoelectric sensors are formed by splicing oppositely polarized piezoelectric cables or films, by changing the applied electric field during manufacture so that adjacent portions of a piezoelectric cable or film have different polarities, or by applying an electric field of a reversed polarity to respective longitudinal sections of a piezoelectric film. Traffic data from up to 8 different lanes of traffic may be discriminated using only two piezoelectric sensors in accordance with the invention by providing unique combinations of output polarities for deflections of the piezoelectric sensors in the different lanes. In order to simplify installation, such piezoelectric sensors may be disposed in parallel within the same housing or concentrically within the same cable.
REFERENCES:
patent: 3631387 (1971-12-01), Hill
patent: 3750127 (1973-07-01), Ayers et al.
patent: 3753223 (1973-08-01), Fayling
patent: 3798474 (1974-03-01), Cassand et al.
patent: 3911390 (1975-10-01), Myers
patent: 4194194 (1980-03-01), Redfern
patent: 4303733 (1981-12-01), Bulle et al.
patent: 4383239 (1983-05-01), Robert
patent: 4604958 (1971-09-01), Oscar
patent: 4609845 (1986-09-01), Soni et al.
patent: 4712423 (1987-12-01), Siffert et al.
patent: 4762970 (1988-08-01), Brinsley
patent: 4888581 (1989-12-01), Guscott
patent: 4939512 (1990-07-01), Dennison et al.
patent: 5008666 (1991-04-01), Gebert et al.
patent: 5206642 (1993-04-01), Gregoire et al.
patent: 5239148 (1993-08-01), Reed
patent: 5245334 (1993-09-01), Gebert et al.
patent: 5265481 (1993-11-01), Sonderegger et al.
Chatigny Joseph V.
Halvorsen Donald L.
Radice Peter F.
Thompson Mitchell
Swarthout Brent A.
The Whitaker Corporation
Tong Nina
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