Optical Measurement of Displacements Using Supbixel Image Registration

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F21%3A00348376" target="_blank" >RIV/68407700:21110/21:00348376 - isvavai.cz</a>

Result on the web

<a href="https://dspace.cvut.cz/handle/10467/92679" target="_blank" >https://dspace.cvut.cz/handle/10467/92679</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Optical Measurement of Displacements Using Supbixel Image Registration

Original language description

Development of Internet-of-things (IoT) technologies opened the way for remote assessment of structural health. Such an assessment can be accomplished by monitoring relative displacements of structural elements since the imminent failure of civil engineering structures usually manifests through a loss of stiffness and hence excessive displacements under static loading or change in vibration frequencies due to dynamic excitation. With these facts in mind, an open-source tool for real-time measurement of relative displacements based on image registration was developed. The use of upsampled matrix-multiplication discrete Fourier transform and measurement limited to predefined points of interest by virtual extensometers allowed high sampling frequencies with subpixel accuracy. The accuracy of the system with respect to a physical length-scale was assessed, and the software was successfully verified through experimental testing in a laboratory. Besides the proof-of-concept laboratory testing using delicate equipment, the developed software was accommodated in portable hardware to fully benefit from the lightweight algorithms. Existence of such a measurement system enabled remote monitoring of displacements and deformations outdoors. Two types of hardware solutions were tested: (i) intended for real-time measurement with a collection of data at high sampling rates and (ii) reliability-focused hardware for off-grid long-term measurements. Both solutions were tested outdoors; the first for measurement of bridge deflections due to traffic loading and the latter for monitoring of a rock massif stability. Besides real-time measurements, the algorithms were also employed for measurements in an off-line mode. Here, the computationally efficient algorithms allowed processing of larger sequences of images recorded, e.g., using high-speed cameras.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20102 - Construction engineering, Municipal and structural engineering

Project

<a href="/en/project/GA19-20666S" target="_blank" >GA19-20666S: Shrinkage-induced deformations and microcracking in structural concrete - monitoring, modeling and identification</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů