Long term optical monitoring technique of displacement fields based on ArUco markers

0560720 - ÚTAM 2023 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Kunecký, Jiří
Long term optical monitoring technique of displacement fields based on ArUco markers.
Proceedings of the SHATIS 2022 – 6th International conference on structural health assessment of timber structures. Prague: Institute of Theoretical and Applied Mechanics, 2022 - (Kunecký, J.; Hasníková, H.), s. 145-149. ISBN 978-80-86246-54-3.
[SHATIS 22. International conference on structural health assessment of timber structures /6./. Praha (CZ), 07.09.2022-09.09.2022]
Grant CEP: GA ČR(CZ) GA21-29389S
Institucionální podpora: RVO:68378297
Klíčová slova: displacement measurement * long-term monitoring * ArUco markers
Obor OECD: Civil engineering

In structural engineering it is often needed to measure tiny displacements of parts of the structure extremely precisely. For such a purpose it is often needed to use some type of sensor attached to the surface of the structure. This paper presents a new technique which simply uses computer vision libraries to measure displacement of markers originally developed for robotics. Such analysis can be under specific circumstances (2D planar movement) valid if we compare two images taken at different times with the same camera. Main advantage of this method is simplicity of use and low cost of markers, which can be printed in a standard office laser printer. The resolution (error) can be for standard cameras around 0.1 pixel. The method is especially developed for research of timber frames/joints behavior in real structures, because displacements of joints in creep or under load can reach an amplitude which is perfectly detectable by this method.
Trvalý link: https://hdl.handle.net/11104/0333573