Traffic monitoring
First Claim
1. An optical fibre sensor for traffic monitoring, comprising:
- a former comprising an elongate plate; and
an optical fibre wound onto at least one surface of the elongate plate, the elongate plate being flexible in a direction transverse to the at least one surface such that passage of traffic over the optical fibre sensor is arranged to cause a variation in at least one predetermined property of an optical signal transmitted through the optical fibre sensor;
wherein the variation in at least one predetermined property of an optical signal transmitted through the optical fibre comprises a variation in phase, which is detectable by an interferometric interrogation system.
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Accused Products
Abstract
The present invention provides an optical fiber sensor for traffic monitoring, which comprises a former consisting of an elongate plate, and an optical fiber wound onto at least one surface of the elongate plate. The elongate plate is flexible in a direction transverse to the at least one surface such that passage. Traffic over the optical fiber sensor is arranged to cause a variation in at least one predetermined property of an optical signal transmitted through the optical fiber sensor. The resulting sensor has a reduced depth which makes it easier to locate within the surface of a traffic route, has increased flexibility to enable it to confirm to the surface of the traffic route, and has good cross axis sensitivity rejection.
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Citations
47 Claims
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1. An optical fibre sensor for traffic monitoring, comprising:
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a former comprising an elongate plate; and
an optical fibre wound onto at least one surface of the elongate plate, the elongate plate being flexible in a direction transverse to the at least one surface such that passage of traffic over the optical fibre sensor is arranged to cause a variation in at least one predetermined property of an optical signal transmitted through the optical fibre sensor;
wherein the variation in at least one predetermined property of an optical signal transmitted through the optical fibre comprises a variation in phase, which is detectable by an interferometric interrogation system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification