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Distributed polymer optical fiber sensors in geotextiles for monitoring of earthwork structures
(2009)
Fiber optic sensors based on polymer optical fibers (POF) have the advantage of being very elastic and robust at the same time. Unlike silica fibers, standard PMMA POF fibers can be strained to more than 40% while fully maintaining their light guiding properties. We investigated POF as a distributed strain sensor by analysing the backscatter increase at the strained section using the optical time domain reflectometry (OTDR) technique. This sensing ability together with its high robustness and break-down strain makes POF well-suited for integration into technical textiles for structural health monitoring purposes. Within the European research project POLYTECT (Polyfunctional textiles against natural hazards) technical textiles with integrated POF sensors, among others sensors are being developed for online structural health monitoring of geotechnical structures. Mechanical deformation in slopes, dams, dikes, embankments and retrofitted masonry structures is to be detected before critical damage occurs. In this paper we present the POF strain sensor properties, reactions to disturbing influences as temperature and bends as well as the results of the different model tests we conducted within POLYTECT. We further show the potential of perfluorinated graded-index POF for distributed strain sensing with increased spatial resolution and measurement lengths.
POF sensors integrated in technical textiles for monitoring of earthwork structures and masonry
(2009)
This chapter summarizes the recent development in the relatively new and emerging field of structural health monitoring using polymer optical fiber (POF) sensors, also referred to as plastic optical fiber sensors. The extraordinary mechanical properties of POF in terms of strainability and ruggedness allows for measurement applications that could not or only insufficiently be solved with existing techniques. A great number of measurement parameters relevant for structural health monitoring applications, such as strain, displacement, crack width, vibrations or moisture can be measured with POF sensors. Numerous sensing principles have been proposed during the last 20 years and the most promising techniques and developments for SHM will be introduced. The focus is on the measurement of physical quantities for early damage detection and propagation, structural surveillance and analysis of dynamic processes.
Shaking table test of a two-storey stone masonry building reinforced with multifunctional textiles
(2010)
Fiber optic sensors based on polymer optical fibers (POF) take advantage of the high elasticity and high break-down strain of POF. Because of their outstanding elastic properties, POF are well suited for integration into technical textiles like geotextiles and medical textiles. Smart textiles with incorporated POF sensors, able to sense various mechanical and physical quantities, can be realized. The integration of POF as a sensor into geotextiles for monitoring of displacement of soil is very attractive since POF can be used for distributed strain measurement of strain values of more than 40 %. An online monitoring of critical mechanical deformations of geotechnical structures like dikes, dams, slopes, embankments as well as of masonry structures can be ensured. Medical textiles that incorporate POF sensors can control vital physiological parameters like respiratory movement and can be used for wearable health monitoring of patients requiring a continuous medical assistance and treatment. The biocompatibility of POF is an important criterion for selecting POF as a medical sensor. The paper shows selected examples of using POF sensors for the mentioned monitoring purposes.