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Double-channel Brillouin optical fiber cable sensor

A fiber optic cable, dual-channel technology, applied in the field of dual-channel Brillouin fiber optic cable sensors

Inactive Publication Date: 2011-04-20
林茂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this technology has been applied in strain monitoring, but there is no application in simultaneous monitoring of temperature and pressure, because the Brillouin frequency shift is generated by the simultaneous action of temperature and pressure, and other Brillouin fiber optic cable sensors cannot solve the problem of cross sensitivity

Method used

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  • Double-channel Brillouin optical fiber cable sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0013] On the optical fiber production machine, the Brillouin optical fiber with a core diameter of 50 μm is covered, and the outer diameter of 250 μm is cured by ultraviolet light once coated with a special Brillouin scattering sensitizer. The optical fiber and ointment are added to the high modulus plastic at the same time In the loose tube made, the optical fiber can move in the tube. A 900 μm tight-buffered fiber is made by using a UV light with an outer diameter of 250 μm to cure the optical fiber once coated with a special Brillouin scattering sensitizer and directly sleeve a layer of material. Among them, the Brillouin fiber with tight sleeve is called tight Brillouin fiber, which is used to monitor pressure; the Brillouin fiber with loose sleeve is called loose Brillouin fiber, which is used to monitor temperature.

Embodiment example 2

[0015] On the optical cable production machine, take a tight-buffered Brillouin fiber and a loose-buffered Brillouin fiber, with a distance of 3mm, and place an alloy wire with a diameter of 1mm in the middle. Produced and obtained (8mm×4mm) dual-channel Brillouin fiber optic cable.

Embodiment example 3

[0017] On the optical cable production machine, take a tight-buffered Brillouin fiber and a loose-buffered Brillouin fiber with a distance of 3.5mm, and place an alloy wire with a diameter of 1.5mm in the middle, and the wrapping material is polymer plastic. ) to produce (8mm×4mm) dual-channel Brillouin fiber optic cable.

[0018] Research on the relevant characteristics of dual-channel Brillouin fiber optic cable:

[0019] 1. Basic parameters

[0020] 1.1 Fiber core diameter 50μm

[0021] 1.2 Optical cable diameter (8mm×4mm)

[0022] 1.3 Dispersion coefficient (1288nm): 0~3.5ps / nm·km

[0023] 1.4 Attenuation (1550nm): 0.1~0.3dB / km

[0024] 1.5 Optical cable cut-off wavelength: 1260nm

[0025] 1.6 Zero dispersion wavelength: 1300~1324nm

[0026] 1.7 Zero dispersion slope: 0.092ps / km·nm2

[0027] 2. Tensile strength analysis

[0028] The strength tensile test was done on a 10-ton tensile machine, and the tensile strength of the optical braze was obtained to be 700Mpa, w...

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Abstract

The invention provides a double-channel Brillouin optical fiber cable sensor capable of monitoring temperature and pressure at the same time. The sensor comprises two parallel Brillouin optical fibers, wherein one optical fiber is a tight optical fiber, the other optical fiber is a loose optical fiber, the tight optical fiber is used for measuring pressure, and the loose optical fiber is used for measuring temperature; and a reinforcing wire is clamped between the two optical fibers, a macromolecular material (glass fiber reinforced polymer, GFRP) is wrapped outside the two optical fibers, and an optical cable (8mm*4mm) with square section is formed. The sensor can be arranged on an oil well, a mine, a tunnel, a dam, a bridge, a road or a cable, and realizes real-time online monitoring of distributed temperature and pressure.

Description

technical field [0001] The invention relates to a dual-channel Brillouin optical fiber cable sensor, relates to a manufacturing method of the sensor and its application in long-distance temperature and pressure monitoring, and belongs to the technical field of optical fiber conduction and sensors. technical background [0002] Health monitoring and diagnosis for major projects and infrastructure is a technology that runs through the entire project life cycle, from project construction, operation management to demolition. The so-called health monitoring refers to the use of on-site, non-destructive monitoring methods to obtain internal information of the structure and analyze various characteristics including the structure in order to understand the changes caused by damage or degradation of the structure. The basis of structural health monitoring is the sensing unit. Currently, commonly used sensing elements are limited to monitoring distance, durability, accuracy and other ...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01L1/24G02B6/44G01K11/322
Inventor 林茂
Owner 林茂
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