Výzkum a vývoj nového typu optovláknového sensoru pro detekci vozidel a měření jejich rychlosti

Abstract

This dissertation focuses on innovative approaches in the field of detection and measurement of vehicle speed in road traffic using fiber optic sensor technology. Optical fibers, originally developed for telecommunication purposes, are increasingly used in the field of automobile transport and automotive with the aim on monitoring selected traffic parameters. Thanks to their unique properties, such as resistance to electromagnetic interference, the ability of very sensitive and accurate detection, and non-invasive installation on the road, fiber optic sensors represent an interesting alternative to conventional traffic sensors. The theoretical part of the work includes literature and patent research which analyzes both conventional and non-conventional methods of speed detection and measurement, while it focuses mainly on basic principles and functions of optical fiber sensors, especially sensors with Bragg gratings. The practical part documents the research, development, and testing of an innovative portable sensor based on Bragg grating technology using polymer encapsulation materials. The described sensor was designed to ensure a non-invasive installation on the road and to maximize its ability to detect vehicles. Functionality was verified both in laboratory conditions and during testing in real road traffic. The results of the measurements were statistically processed and described with the detection success rate at 99.92% and the difference in the measured speeds against the reference measuring device at a maximum of ±1.5 km/h.