Overview
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Pierre FERDINAND: Doctor of Science - Expert consultant - Research Director and Scientific Advisor at CEA Saclay
INTRODUCTION
Bragg gratings are diffractive microstructures obtained by photo-inscribing laser interference within the core of single-mode optical fibers. Short-period Bragg gratings consist of a uniform, submicron modulation of the refractive index of the fiber core. In fact, a Bragg grating a few millimeters long has several thousand Λ "steps", and acts as a reflector for a fine spectral band (0.2 to 0.3 nm) centered at , with Λ (~ 0.5 µm for example) and n e (~ 1.45) the effective index of the mode. Any change in Λ or n e therefore "moves" λ B whose tracking provides the inducing parameter. Of course, Bragg gratings can be multiplexed. To do this, it is sufficient, for example, to cascade several of them with slightly different pitches Λ i and probe them each around their characteristic wavelength, with incident light reflected respectively at λ B1 , λ B2 ... λ BN . The poorly resolved measurement of λ B i indicates the address of the ith network, while its accurate analysis provides the desired measurement.
In addition to this brief description of Bragg grating transducers, the reader may wish to refer to the article
This article deals with the complementary part of Bragg grating sensors,...
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KEYWORDS
multiplexing | Optical Fiber Sensor | Fiber Bragg Grating | quasi-distributed sensor | sensor network | Structure Health Monitoring
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Mechanical and dimensional measurements
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Fiber optic sensors with Bragg gratings
Bibliography
Quoted projects
– European projects :
CATIEMON (CatenaryInterfaceMonitoring Coherent sensing technology for electrical railway infrastructure and rolling stock for interoperable cross boundary transportation). Specific Targeted Project TST4-CT-2005-12105. Ref : 012105. Leader: Siemens AG [Germany]. Partners: BLS AG [Switzerland], Morganite Ltd [Great Britain], Furrer+Frey AG [Switzerland], Cybernetics [France],...
Data on the industrial context and its evolution
Since the early 90s, a number of players, mainly private companies, involved on the supply side in Bragg technologies have emerged, developing their activities and products.
It's worth noting, however, that several of the companies featured in the first edition of the Techniques de l'Ingénieur
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