Road traffic monitoring system

Details Road traffic monitoring system Road traffic monitoring system

2006-04-04

2006-04-04

Doan, Jennifer (Department: 2874)

Optical waveguides

Optical waveguide sensor

Including physical deformation or movement of waveguide

C385S012000

Reexamination Certificate

active

07024064

ABSTRACT:
A traffic monitoring system comprises at least one sensor station (2) and an interferometric interrogation system (9); wherein the at least one sensor station (2) comprises at least one optical fibre sensor (5) deployed in a highway (1); wherein the at least one optical fibre sensor (5) comprises a former (14), an optical fibre (13) wound on the former, a casing (15) and compliant material (16) provided between the casing and the former; such that the compliant material reduces the sensitivity of the sensor (5); and wherein the interferometric interrogation system (9) is adapted to respond to an optical phase shift produced in the at least one optical fibre sensor due to a force applied by a vehicle passing the at least one sensor station (2).

REFERENCES:
patent: 4818064 (1989-04-01), Youngquist et al.
patent: 5056884 (1991-10-01), Quinlan, Jr.
patent: 6563970 (2003-05-01), Bohnert et al.
patent: 2 673 749 (1992-09-01), None
patent: 2 703 451 (1994-10-01), None

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