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Phase-OTDR based on space difference of Rayleigh backscattering is proposed. The Rayleigh backscattering from different segments of the test fiber interfere by adjusting the path difference of the imbalance Michelson interferometer. According to the resemble polarization and intensity of two path light, amplitude, frequency of the acoustic signal at the different locations along the sensing fiber...
In the oil field development and production, fluid flow is an extremely important parameter which determines the transmission characteristics of the oil production, real-time monitoring of fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery. A method for interrogating fiber optic sensors using flow-induced pipe vibration is proposed,...
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