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

A pulse encoding, fully distributed technology, applied in the direction of instruments, scientific instruments, optical devices, etc., can solve the problems of unsuitability, complex structure, and inability to locate

CN102322809AInactive Publication Date: 2012-01-18CHINA JILIANG UNIV
6 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2012-01-18
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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 ...

Examples

Embodiment Construction

[0047] refer to figure 1 , a pulse coded ultra-long-distance fully distributed optical fiber Rayleigh and Raman scattering sensor, which is characterized in that it includes a pulse coded fiber laser drive power supply 10, a pulse coded fiber laser 11, an integrated optical fiber wavelength division multiplexer 12, and an optical fiber narrowband reflection filter Chip 13, pump-signal coupler 14, fiber Raman laser 15, 100km sensing fiber 16, photoelectric receiving module 17, digital signal processor 18 and industrial computer 19, digital signal processor 18 is connected with industrial computer 19, pulse The input end of the coded fiber laser driving power supply 10 is connected to the output end of the digital signal processor 18, the output end of the pulse coded fiber laser driving power supply 10 is connected to the input end of the pulse coded fiber laser 11, and the time series generated by the digital signal processor 18 The pulse-coded signal is driven by the pulse-co...