KEYWORDS: Temperature metrology, Spatial resolution, Temperature sensors, Time metrology, High temperature raman spectroscopy, Multimode fibers, Raman spectroscopy, Receivers, Raman scattering, Fiber lasers
The performance of distributed temperature sensor systems based on spontaneous Raman scattering and coded OTDR
are investigated. The evaluated DTS system, which is based on correlation coding, uses graded-index multimode fibers,
operates over short-to-medium distances (up to 8 km) with high spatial and temperature resolutions (better than 1 m and
0.3 K at 4 km distance with 10 min measuring time) and high repeatability even throughout a wide temperature range.
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