3 February 1999 Recent advances in distributed optical fiber temperature sensing using the Landau-Placzek ratio
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Distributed optical fiber temperature sensing (DTS) provides an elegant way of monitoring the temperature at many points without necessitating the accurate positioning of individual discrete sensors. This paper demonstrates recent advances in distributed temperature sensing based on spontaneous Brillouin scattering. A high spatial and temperature resolution is achieved by exploiting a novel low cost detection system. The experimental configuration consists of two key components; a Q-switched laser source to generate the backscattered signal and the low cost detection system which comprises an in-fiber double pass Mach-Zehnder interferometer and a sensitive InGaAs APD connected to a computer based averaging system. It is the relative low cost of these components which has made the Brillouin based temperature sensor so attractive for commercial exploitation. A spatial resolution of 3.0 meters with a Brillouin temperature resolution of 0.9 degrees C at a range of 16km has been achieved.
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Gareth P. Lees, Gareth P. Lees, Peter C. Waite, Peter C. Waite, Arthur H. Hartog, Arthur H. Hartog, Trevor P. Newson, Trevor P. Newson, "Recent advances in distributed optical fiber temperature sensing using the Landau-Placzek ratio", Proc. SPIE 3541, Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII, (3 February 1999); doi: 10.1117/12.339104; https://doi.org/10.1117/12.339104

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