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High-spatial resolution long-distance distributed optical fiber temperature strain sensing system

A high-spatial-resolution, distributed optical fiber technology, which is applied in the use of optical devices to transmit sensing components, thermometers, and conversion sensor outputs, etc., can solve the problems of existing sensing loops, shortening sensing distances, and unsuitable health monitoring occasions. , to achieve the effect of improved spatial resolution, easy operation and simple structure

Inactive Publication Date: 2017-03-22
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

These technologies adopt different technical solutions to achieve high spatial resolution sensing, but they all introduce some new problems, such as shortened sensing distance, presence of sensing loops, etc., and are not suitable for actual large-scale projects. health monitoring occasions

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[0028] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto.

[0029] The basic principle of the present invention is as follows: the optical pulse of pulse width τ is injected into the sensing fiber of the BOTDR system, and its spatial positioning accuracy is: ΔL=c τ / 2n ,in c The speed of light in vacuum is 3×10 8 m / s, n The refractive index of the optical fiber is about 1.5, and the Brillouin spectrum obtained by demodulation includes the spatial positioning accuracy ΔL The integrated sensing information within the range cannot be further subdivided according to the demodulated Brillouin spectrum. Alternately injecting light pulses τ with different pulse widths into the sensing fiber of the BOTDR system 1 and τ 2 , the pulse width τ 1 and τ 2 Set in the range of 20ns~100ns, since the acou...

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Abstract

The present invention relates to a high-spatial resolution long-distance distributed optical fiber temperature strain sensing system. The system injects an optical pulse pair of which the pulse widths have a slight difference in a sensing optical fiber based on a pulse pair secondary frequency spectrum differential technology, detects and acquires a time domain brillouin scattering signal generated by each pulse, and adopts two sets of different time window widths to extract the data separately for the spectral analysis, and carries out the secondary frequency spectrum differential operation based on the obtained four sets of brillouin frequency spectrum data, thereby obtaining the space position sensing information covered by the pulse width difference of the optical pulse pair corresponding to the secondary differential brillouin spectrums, and improving the spatial resolution. By designing the pulse widths and the pulse width difference of the optical pulse pair in the system reasonably, the action of a brillouin nonlinear effect is full, and the information within a sensing range of dozens of kilometers is acquired on the condition of keeping a higher signal-to-noise ratio of the system, so that the distributed optical fiber temperature strain sensing system of high spatial resolution (cm magnitude), long distance (greater than 50 kilometers) and high measurement precision (plus or minus 1 DEG C, plus or minus 20 Mu Epsilon) can be realized.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber temperature and strain measurement, in particular to the second Brillouin spectrum difference based on pulse pair while maintaining the performance parameters of long distance (>50 kilometers) and high measurement accuracy (±1°C, ±20με). The technology realizes a distributed optical fiber temperature and strain sensing system with a spatial resolution of centimeter level. Background technique [0002] In the Brillouin scattering-based distributed optical fiber sensing (BOTDR) system, the incident pulse light interacts with the acoustic phonons in the fiber to produce back Brillouin scattered light, which is relative to the incident light The frequency shift is affected by temperature and strain. For single-mode optical fibers in the communication band, the frequency shift of Brillouin spontaneously scattered light relative to the incident light is about 11GHz, and the linear c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01B11/16G01K11/32G01K11/322
CPCG01B11/16G01D5/35364G01K11/32G01K11/322
Inventor 甘久林杨中民李晴宇李炯
Owner SOUTH CHINA UNIV OF TECH
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