Telecommunications tunnel monitoring system based on distributed optical fiber strain measurement
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We have developed a system for monitoring telecommunications tunnels to improve the reliability of telecommunication and to reduce maintenance costs through early damage detection. Core components of the system are a Brillouin optical time-domain reflectometer (BOTDR), which allows distributed and long-distance strain measurement, and optical fiber sensors installed in tunnels. Experimental results show that this system can detect tunnel deformation with a measurement error of 0.1 mm from a contraction of 1 mm to an elongation of 6 mm over a span of 10 km. The system used in practice at present is introduced.
[1] T. Horiguchi,et al. Tensile strain dependence of Brillouin frequency shift in silica optical fibers , 1989, IEEE Photonics Technology Letters.
[2] Hiroshige Ohno,et al. Spatial Resolution Enhancement of Distributed Strain Measurement Using BOTDR by Partially Gluing Optical Fiber , 2002 .
[3] Hiroshi Naruse,et al. Development of highly stable BOTDR strain sensor employing microwave heterodyne detection and tunable electric oscillator , 2001, International Symposium on Photonics and Applications.