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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 to8 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. Keywords:  Spontaneous  Raman  scattering,  distributed  temperature  sensor,  optical  time  domain  reflectometry,  fiber

High performance and highly reliable Raman-based distributed temperature sensors based on correlation-coded OTDR and multimode graded-index fibers