Distributed optical fiber sensing device based on ASE noise coherent detection and method

An ASE noise, distributed optical fiber technology, which is applied in the measurement device, the use of optical devices, and the use of optical devices to transmit sensing components, etc., can solve the problem that the distributed optical fiber sensing system cannot take into account the spatial resolution and sensing distance, and the realization cost High, complex light source structure and other problems, to overcome the spatial resolution and sensing distance, the effect of improving the spatial resolution

Active Publication Date: 2015-12-09
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0006] In order to solve the problems that the existing distributed optical fiber sensing system cannot take into account the spatial resolution and sensing distance, the spatial resolution is low, the structure of the light source is complicated, the realization process is time-consuming, and the realization cost is high, the present invention provides a coherent detection based on ASE noise Distributed optical fiber sensing device and method

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  • Distributed optical fiber sensing device based on ASE noise coherent detection and method

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Embodiment Construction

[0019] A distributed optical fiber sensing device based on ASE noise coherent detection, including an ASE noise source 1, a tunable optical filter 2, a 1×2 fiber coupler 3, a first optical amplifier 4, an optical scrambler 5, and an optical circulator 6 , sensing optical fiber 7, second optical amplifier 8, variable optical delay line 9, third optical amplifier 10, 2×2 optical fiber coupler 11, double-balanced photodetector 12, data acquisition card 13, computer 14;

[0020] Among them, the output end of the ASE noise source 1 is connected to the input end of the tunable optical filter 2 through a single-mode fiber jumper; the output end of the tunable optical filter 2 is connected to the 1×2 fiber coupler 3 through a single-mode fiber jumper The incident end connection;

[0021]The first output end of the 1×2 fiber coupler 3 is connected to the input end of the first optical amplifier 4 through a single-mode fiber jumper; the output end of the first optical amplifier 4 is con...

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Abstract

The invention relates to a distributed optical fiber sensing system, and in particular relates to a distributed optical fiber sensing device based on ASE noise coherent detection and a method. According to the invention, the problems of unavailable spatial resolution and sensing distance combination, low spatial resolution, complex light source structure, time-consuming implementation process, and high implementation cost of the existing distributed optical fiber sensing system are solved. The distributed optical fiber sensing device based on ASE noise coherent detection comprises an ASE noise source, a tunable optical filter, a 1*2 optical fiber coupler, a first optical amplifier, an optical scrambler, an optical circulator, a sensing optical fiber, a second optical amplifier, a variable optical delay line, a third optical amplifier, a 2*2 optical fiber coupler, a dual balance photodetector, a data acquisition card and a computer. The device and the method, which are provided by the invention, are applicable to the field of distributed optical fiber sensing.

Description

technical field [0001] The invention relates to a distributed optical fiber sensing system, in particular to a distributed optical fiber sensing device and method based on ASE noise coherent detection. Background technique [0002] Distributed optical fiber sensing system has been widely used in aerospace, petrochemical, electric power industry, nuclear industry, civil engineering due to its advantages of distributed measurement, long monitoring distance, high spatial resolution, fast response time, anti-electromagnetic interference and military fields. At present, distributed optical fiber sensing systems can be divided into the following three types according to the scattering mechanism in optical fibers: distributed optical fiber sensing systems based on Rayleigh scattering, distributed optical fiber sensing systems based on Raman scattering, and distributed optical fiber sensing systems based on Brillouin scattering. distributed optical fiber sensing system. Among them...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01K11/32G01B11/16G01K11/322
Inventor 张建忠张明江刘毅王云才张明涛冯昌坤
Owner TAIYUAN UNIV OF TECH
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