Overview
ABSTRACT
The advent of high quality optical fibers in particular single-mode, devoted to telecommunications, has gradually enabled the development of many concepts of distributed (continuously sensitive) and quasi-distributed (multi-point) Optical Fiber Sensor Networks, thanks to a flourishing worldwide R&D for four decades. Gradually, the most technologically mature concepts and achievements have been commercialized. These are respectively optoelectronic measuring instruments, and related sensors taking advantage of the three light scattering phenomena, Rayleigh, Raman and Brillouin, encountered in silica-based fibers, as well as photo-written Fiber Bragg Grating-based transducers. Their performances and specificities of these instrumentations make them mostly unrivaled with other measurement technologies.
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Pierre FERDINAND : Doctor of Science - Expert, Consultant
INTRODUCTION
As early as the 1970s, due to their availability, the first (multimode) optical fibers were used as guides for communications , and later as sensors, despite the lack of modern components (couplers, connectors, laser diodes, etc.).
In 1983, the first conference dedicated to optical fiber sensors (OFS), namely the OFS (Optical Fiber Sensor Conference), established the field. Then, the 1980s saw a surge of activity leading to numerous feasibility experiments (interferometry, polarimetry, reflectometry, etc.) and the establishment of concepts that still prevail today. At that time, the dominant sensor was the Sagnac-effect gyroscope due to its applications in both civilian and military inertial navigation (>30% of global efforts were devoted to it) .
Around 1985, the concept of Fiber Optic Sensor Networks (FOSN)
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KEYWORDS
Fiber Bragg Grating | quasi-distributed sensor | distributed sensor | reflectrometry | Rayleigh backscattering | Raman backscattering | Brillouin backscattering
Fiber-optic sensor networks -Measurements and multiplexing
Reminders: Optical fibers and CFO optical fiber sensors
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