Pulse coding ultra-long-range fully-distributed optical fiber Rayleigh and Raman scattering sensor

Abstract

The invention discloses a pulse coding ultra-long-range fully-distributed optical fiber Rayleigh and Raman scattering sensor, which comprises a pulse coding optical fiber laser driving power, a pulse coding optical fiber laser, an integrated optical fiber wavelength division multiplexer, an optical fiber narrow-band reflection light filter, a pump-signal coupler, an optical fiber Raman laser, a sensor optical fiber, a photoelectric receiving module, a digital signal processor and an industrial computer. Based on a pulse coding principle, an optical fiber stimulated Raman amplification principle and an optical fiber Rayleigh and Raman fusion scattering sensing principle, the sensor positions a measuring point by using an optical time domain reflection principle. The signal-to-noise ratio of a sensor system is improved, and the measurement temperature and the strain accuracy are improved. The optical fiber laid on the spot is not electrified, resists electromagnetic interference, and is radiation-resistant and corrosion-resistant, so the optical fiber is not only a transmission medium but also a sensing medium. The sensor is low in cost, long in service life, simple in structure, good in signal-to-noise ratio and high in reliability, and is suitable for monitoring petrochemical pipelines, tunnels and large-scale civil engineering in an ultra-long-range 100-kilometer range, and monitoring hazard forecast.

Description

technical field [0001] The invention relates to the field of optical fiber sensors, in particular to a pulse coded ultra-distance distributed optical fiber Rayleigh and Raman scattering sensor. Background technique [0002] For a long time, in the field of engineering at home and abroad, large-scale civil construction, bridges, tunnels, petrochemical pipelines, oil storage tanks and power cables have mainly used electrical strain gauges and thermosensitive electric groups as strain and temperature sensors, and each sensor needs to be connected with wires. , to form a large-scale detection network, the structure is very complicated, this kind of sensor itself is charged, it is inherently unsafe, susceptible to electromagnetic interference, not resistant to corrosion, and cannot be positioned, not suitable for use in harsh environments, let alone applied geology Scenes of disasters and fires. [0003] The optical fiber sensor network developed in recent years can realize ...

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Problems solved by technology

[0002] For a long time, in the field of engineering at home and abroad, large-scale civil construction, bridges, tunnels, petrochemical pipelines, oil storage tanks and power cables have mainly used electrical strain gauges and thermosensitive electric groups as strain and temperature sensors, and each sensor needs to be connected with wi

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