Measuring sub-mm structural displacements using QDaedalus: a digital clip-on measuring system developed for total stations

Charalampous, Elina; Psimoulis, Panos; Guillaume, Sebastian; Spiridonakos, Minas; Klis, Roman; Burki, Beat; Rothacher, Markus; Chatzi, Eleni; Luchsinger, R.; Feltrin, G.

Abstract

The monitoring of rigid structures of modal frequencies greater than 5 Hz and sub-mm displacement is mainly based so far on relative quantities from accelerometers, strain gauges etc. Additionally geodetic techniques such as GPS and Robotic Total Stations (RTS) are constrained by their low accuracy (few mm) and their low sampling rates. In this study the application of QDaedalus is presented, which constitutes a measuring system developed at the Geodesy and Geodynamics Lab, ETH Zurich and consists of a small CCD camera and Total Station, for the monitoring of the oscillations of a rigid structure. In collaboration with the Institute of Structural Engineering of ETH Zurich and EMPA, the QDaedalus system was used for monitoring of the sub-mm displacement of a rigid prototype beam and the estimation of its modal frequencies up to 30 Hz. The results of the QDaedalus data analysis were compared to those of accelerometers and proved to hold sufficient accuracy and suitably supplementing the existing monitoring techniques.

Citation

Charalampous, E., Psimoulis, P., Guillaume, S., Spiridonakos, M., Klis, R., Burki, B., …Feltrin, G. (2015). Measuring sub-mm structural displacements using QDaedalus: a digital clip-on measuring system developed for total stations. Applied Geomatics, 7(2), https://doi.org/10.1007/s12518-014-0150-z

• Journal Article Type: Article
• Acceptance Date: Dec 9, 2014
• Online Publication Date: Dec 20, 2014
• Publication Date: Jun 1, 2015
• Deposit Date: Jul 22, 2016
• Publicly Available Date: Jul 22, 2016
• Journal: Applied Geomatics
• Print ISSN: 1866-9298
• Electronic ISSN: 1866-928X
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 7
• Issue: 2
• DOI: https://doi.org/10.1007/s12518-014-0150-z
• Keywords: CCD camera, total station, sub-mm oscillation, high modal frequency
• Public URL: https://nottingham-repository.worktribe.com/output/750421
• Publisher URL: http://link.springer.com/article/10.1007%2Fs12518-014-0150-z
• Additional Information: The final publication is available at Springer via http://dx.doi.org/10.1007/s12518-014-0150-z
• Contract Date: Jul 22, 2016