New approach for speed and direction measurement by fiber optic sensor

Jakub Cubik; Jan Nedoma; Marcel Fajkus; Stanislav Hejduk; Daniel Krizan; Carlos Marques

doi:10.1117/12.3016970

20 June 2024 New approach for speed and direction measurement by fiber optic sensor

Jakub Cubik, Jan Nedoma, Marcel Fajkus, Stanislav Hejduk, Daniel Krizan, Carlos Marques

Proceedings Volume 13001, Specialty Optical Fibres VIII; 130010K (2024) https://doi.org/10.1117/12.3016970
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Traffic monitoring is the subject of scientific publications and technical solutions, primarily due to the need to optimize and increase traffic safety. There are many systems that can determine direction, velocity, or make vehicle classifications. These can be, for example, traditional camera systems, laser gates, LIDAR scanning, pneumatic sensors, or induction loops. A non-traditional approach is the use of optical fibers as a traffic sensor. Optical fiber sensors use different technologies, one of them being sensors that evaluate the phase change of light (interferometers). The enormous sensitivity of these sensors combined with electromagnetic inertia are promising parameters for deploying system in areas that may be disturbed by magnetic fields or require special security requirements. The focus of this research is an optical fiber sensor based on the Michelson interferometer. The paper deals with the sensitivity of the measuring arm when changing its arrangement. Different configurations of the measuring fiber arrangement in relation to the objects to be monitored lead to the construction of a monitoring system with properties useful for direction monitoring and velocity measurement. This paper deals with the asymmetric configuration of the measuring arm of an optical fiber interferometer. Experiments in outdoor vehicular traffic conditions together with frequency spectrum analysis investigate the usability of the measurement system. The system itself can be extended to classify the measured objects by analyzing the amplitude frequency spectrum and using machine learning.

Citation Download Citation

Jakub Cubik, Jan Nedoma, Marcel Fajkus, Stanislav Hejduk, Daniel Krizan, and Carlos Marques "New approach for speed and direction measurement by fiber optic sensor", Proc. SPIE 13001, Specialty Optical Fibres VIII, 130010K (20 June 2024); https://doi.org/10.1117/12.3016970

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KEYWORDS

Sensors

Interferometers

Fiber optics sensors

Design

Optical testing

Photodetectors

Roads

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