Occupational Medicine & Health Affairs
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An optical fiber is a 125 μm cylindrical waveguide of light made of two concentric layers of silica. It is an excellent support
for miniaturized sensors, allowing remote operation in very small volumes. In potentially explosive atmospheres, sensors
based on optical fibers offer a set of advantages without equivalent for well-established technologies. They are indeed immune
to electromagnetic interferences and present a good resistance to high temperatures and to chemical corrosion. Their small
dimensions combined with their light weight and flexibility allows embedding them directly in the structures to monitor
without affecting their mechanical resistance. Last but not least, depending on the interrogation technique that is set up, optical
fibers yield distributed (sensing all along the fiber length) or quasi-distributed (sensing at different points cascaded along the
fiber length) measurements that can be remotely addressed. In this presentation, the focus will be made on applications in
road tunnels and undercroft car parks monitoring. These closed and wide spaces present issues in terms of air quality control
(CO and NOx), fire detection and combustible gas leak detection. Classically, to insure the safety level, a sufficient number of
detectors are installed to cover the entire area, which is generally expensive. Optical fibers bring an elegant solution as they
ensure all functions (sensing, addressing and data transfer). After a brief introduction to the technology, this presentation
will focus on optical fiber sensor solutions developed for air quality monitoring, in particular NO2, flaming fire detection and
combustible gas leak detection (methane and hydrogen).
Christophe Caucheteur received the M.S. degree in Electrical Engineering in 2003 from the Faculte Polytechnique de Mons, Belgium. He was awarded the PhD
degree in Applied Sciences in 2007 from the same university for his research focusing on the realization of mechanical and chemical sensors based on the use of
fiber Bragg gratings. He is co-author of 5 book chapters and more than 140 papers in international journals and conference proceedings. He is also co-author of 5
international patents regarding the development of fiber Bragg gratings sensors. He is recipient of an ERC (European Research Council) Starting Grant.
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