Road traffic monitoring system

摘要

A road-traffic monitoring system comprises at least one sensor station (2) and an interferometric interrogation system (9). The at least one sensor station (2) comprises an optical fibre (5) deployed in a highway (1). The system is characterised in that the interferometric interrogation system (9) is arranged to detect an optical phase change in radiation received from the fibre, the optical phase change resulting from a change in length of the optical fibre (5) produced by a force applied thereto by a vehicle passing the at least one sensor station (2). <IMAGE>