Temperature and Strain Measurements in Concrete using Micro-Structure Optical Fiber Sensors
Areias, Lou Geernaert, T Sulejmani, S Berghmans, F Luyckx, G Chah, K Troullinos, I Coppens, E Van Marcke, P Raymaekers, D Craeye, Bart
Proceedings of International Symposium on Non-Destructive Testing in Civil Engineering
International Symposium on Non-Destructive Testing in Civil Engineering, NDT-CE 2015 location:Berlin (Germany) date:September 2015
A recent test carried out to evaluate the construction feasibility of the Belgian supercontainer concept incorporated several types of state-of-the-art sensors and innovative monitoring techniques, including the use of different types of optical fiber sensors. One of these is a relatively new type of sensor developed by the Brussels Photonics Team (B-PHOT) of the Vrije Universiteit Brussel. The sensor uses highly birefringent microstructured optical fibers equipped with fiber Bragg gratings (MOFBGs) sensors. they were embedded in a carbon-fiber reinforced composite plate to provide protection against the concrete’s highly alkaline environment, facilitate installation in the concrete mould and allow the transfer of strain onto the fiber. The double reflection spectrum of the MOFBGs allows monitoring strain and temperature simultaneously.
This paper presents results of temperature and strain measurements obtained with MOFBG sensors during a ½-scale test performed in 2013. The results compare well with similar measurements obtained using conventional thermocouples and vibrating wire strain gauges.