Brillouin distributed fiber sensing device and method employing chaotic correlation method for positioning

A distributed optical fiber and sensing device technology, which is applied in the direction of using optical devices, measuring devices, thermometers with physical/chemical changes, etc. Achieving the effect of temperature or strain

Active Publication Date: 2016-07-20
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0004] The invention solves the problem that each measurement in the prior art can only measure a single point on the optical fiber, and cannot realize the continuous measurement o

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  • Brillouin distributed fiber sensing device and method employing chaotic correlation method for positioning

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Embodiment Construction

[0021] Brillouin distributed optical fiber sensing device positioned by chaos correlation method, including chaotic laser (1), 1×2 first fiber coupler (2), first high-speed electro-optic modulator (3), microwave signal source (4) , optical scrambler (5), optical isolator (6), first optical amplifier (7), sensing fiber (8), optical circulator (9), second high-speed electro-optic modulator (10), pulse generator device (11), 1×2 second fiber coupler (12), second optical amplifier (13), third optical amplifier (14), 1×2 third fiber coupler (15), first optical bandpass Filter (16), second optical bandpass filter (17), first photodetector (18), second photodetector (19), third photodetector (20), data acquisition card (21) , computer (22);

[0022] Wherein, the output end of the chaotic laser (1) is connected to the input end of the 1×2 first fiber coupler (2);

[0023] 1×2 The first output end of the first fiber coupler (2) is connected to the input end of the first high-speed el...

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Abstract

The invention relates to the technology of distributed fiber sensing, specifically a Brillouin distributed fiber sensing device and method employing a chaotic correlation method for positioning, and solves problems that the prior art just can achieve the measurement of a single point on an optical fiber at each time, and cannot achieve the continuous measurement of long-distance temperature or strain. The sensing device and method enable a chaotic pump light signal to be divided into two ways, wherein one way still serves as a pump light signal and enter the sensing optical fiber, and the other way serves as a reference light signal. The device and method are directly implemented through adding one reference signal storage channel in the device. Moreover, the device and method obtain the Brillouin gain spectrum through recording the corresponding relation between a modulated frequency of a chaotic detection light modulation side band and the mean power of detection light. The device and method achieve the positioning of the temperature or strain of the sensing optical fiber through employing the correlation method of a pulse-modulation chaotic laser signal, are easier to measure the position of the temperature or strain of the optical fiber, and are longer in sensing distance.

Description

technical field [0001] The invention relates to a distributed optical fiber sensing technology, in particular to a Brillouin distributed optical fiber sensing device and method for positioning by a chaotic correlation method. Background technique [0002] Distributed fiber optic sensors have been widely used in the monitoring of important infrastructures such as subways, tunnels, dams, and power grids because they can acquire long-range and large-capacity sensing data at one time. The distributed optical fiber sensing technology based on Brillouin scattering has become a research hotspot in the field of distributed optical fiber sensing because it can simultaneously measure temperature and strain. [0003] Distributed optical fiber sensing technology based on Brillouin scattering usually uses optical pulse signals as detection signals to realize continuous measurement of long-distance sensing optical fibers. However, the use of pulse signals to locate the temperature or str...

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Application Information

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IPC IPC(8): G01B11/16G01K11/32G01K11/322
CPCG01B11/16G01K11/32G01K11/322
Inventor 张建忠张明江刘毅王云才张明涛冯昌坤李铸平
Owner TAIYUAN UNIV OF TECH
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