1A novel 1.65µm Raman based Distributed Temperature Sensor

Abstract: This paper demonstrates a novel Raman-based distributed temperature sensing (DTS) system using a laser source at a wavelength of 1.65µm, which permits monitoring of temperature in active transmission lines. This Raman based DTS system has been demonstrated utilising conventional telecommunications single-mode silica fibres over a range exceeding 10km, spatial resolution of 10m and temperature resolution of 4°C was achieved. Introduction: Optical fibre temperature sensors based on spontaneous Raman scattering have been the subject of research for a number of years [1-3]. Optical fibre distributed temperature sensors enable the temperature profile along a length of fibre to be continuously monitored. The sensors operate on the powerful optical time domain reflectometry (OTDR) principle whereby a pulse of light is transmitted down the fibr