Pulse coding extra-long distance fully-distributed fiber Rayleigh and Raman scattering sensor of fusion fiber Raman frequency shift device

A technology of pulse coding and Raman frequency shift, which is applied in the direction of using optical devices to transmit sensing components, instruments, scientific instruments, etc., can solve the problem of not meeting the safety and health monitoring of transmission power cables.

Inactive Publication Date: 2012-01-18
CHINA JILIANG UNIV
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Problems solved by technology

However, it can no longer meet the safety and health monitoring of oil pipelines and transmission power cables in recent years, and the urgent

Method used

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  • Pulse coding extra-long distance fully-distributed fiber Rayleigh and Raman scattering sensor of fusion fiber Raman frequency shift device
  • Pulse coding extra-long distance fully-distributed fiber Rayleigh and Raman scattering sensor of fusion fiber Raman frequency shift device

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Embodiment Construction

[0042] refer to figure 1 , a pulse-coded ultra-long-range fully distributed optical fiber Rayleigh and Raman scattering sensor fused with a fiber-optic Raman frequency shifter, including a pulse-coded fiber laser drive power supply 10, a pulse-coded fiber pulse laser 11, a single-mode fiber 12 and a 1660nm bandpass An optical fiber Raman frequency shifter composed of an optical filter 13, an integrated optical fiber wavelength division multiplexer 14, a sensing optical fiber 15, a photoelectric receiving module 16, a coding, decoding and demodulation digital signal processor 17, and an industrial computer 18, and a coding, decoding and decoding One signal output end of the modulation digital signal processor 17 is connected with the pulse code laser drive power supply 10, and the other signal output end is connected with the industrial computer 18, and the time series pulse code signal produced by the code decoding demodulation digital signal processor 17, Control the pulse-c...

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Abstract

The invention discloses a pulse coding extra-long distance fully-distributed fiber Rayleigh and Raman scattering sensor of a fusion fiber Raman frequency shift device. The sensor comprises a pulse coding fiber laser drive power supply, a pulse coding fiber pulse laser, a fiber Raman frequency shift device consisting of a single mode fiber and a 1,660nm bandpass filter, an integrated fiber wavelength division multiplexer, a sensing fiber, a photoelectric receiving module, a coder-decoder demodulation digital signal processor and an industrial personal computer. The sensor is used for positioning a measuring point on the basis of a fiber Raman frequency shift device principle, a pulse coding principle and a fiber Rayleigh and Raman fusion scattering sensing principle by using an optical time domain reflection principle. The sensor has low cost, long service life, a simple structure, high signal-to-noise ratio and high reliability and is suitable for large-scale civil engineering monitoring and hazard forecast monitoring of petrochemical pipelines and tunnels within a long distance and extra-long distance 80-kilometer range.

Description

technical field [0001] The invention relates to the field of optical fiber sensors, in particular to a pulse code ultra-long-distance fully distributed optical fiber Rayleigh and Raman scattering sensor fused with an optical fiber Raman frequency shifter. 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 optic...

Claims

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Application Information

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IPC IPC(8): G01D5/353G01B11/16G01K11/32G01K11/324
Inventor 张在宣余向东王剑锋李晨霞康娟金尚忠
Owner CHINA JILIANG UNIV
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