Nedestruktivní optovláknový senzorový systém pro měření rychlosti v dopravním provozu

Abstract

My dissertation thesis describes a design, implementation, and testing of a new way of vehicles detection and speed measurement primarily used in the road transport with the speed limit up to 100kph, which can be utilized in the concept of SMART Cities. Results published in this thesis confirm that a similar approach can be also used for the monitoring of tram, underground and railway transport. The proposed measuring system is based on the interference in optical fibers. The key condition is that sensory units are connected in series on the basis of Mach-Zehnder interferometer working with single-mode optical fibers of G.652.D. and G.653 standards, with the wavelength of 1550nm and demands on the radiation source output in the range of mW. Solutions described in this dissertation thesis are currently protected by copyright (the patent No.306992). The basis of this solution lies in electromagnetic interference immunity (EMI) and simple implementation as the sensory units do not need to be installed destructively into the roadway or railway. With regard to a massive use of optical fibers along roads and railway tracks, which provides telecommunications and security services, the important advantage is also the possibility of direct connections of sensors to existing infrastructure and the possibility of remote evaluation. The measuring system was tested in real traffic over a long period and is characterized by an error with the tolerance of ± 3kph which is given by sectional speed measuring systems up to 100kph in the Czech Republic.