Wait, P.C. and Newson, T.P.
Reduction of coherent noise in the Landau Placzek ratio method for distributed fibre optic temperature sensing
Optics Communications, 131, (4-6), . (doi:10.1016/0030-4018(96)00344-6).
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The Landau Placzek ratio method for distributed fibre optic temperature sensing is based on the ratio of the Rayleigh and Brillouin backscattered light. However, because of the coherent nature of Rayleigh scattering. use of the same narrow bandwidth source as required for the Brillouin signal results in significant coherent noise in the Rayleigh signal. A novel technique is demonstrated whereby the amplified spontaneous emission noise and amplifying properties of an erbium doped fibre amplifier may be exploited to reduce the coherent noise on the Rayleigh backscatter signal. This results in a significant improvement in both temperature and spatial resolution over previously reported results.
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