Abstract

The perfomance of distributed temperature sensor systems based on spontaneous Raman scattering and coded OTD are investigated. The evaluated DTS system, which is based on correlation coding, uses graded-index multimode fiber 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.