Seed injection BOTDR distributed optical fiber sensing system

A distributed optical fiber, sensing system technology, applied in the direction of using optical devices to transmit sensing components, etc., can solve the problems of short sensing distance, difficult fault detection, low signal-to-noise ratio of BOTDR system, and achieve simple structure, sensing The effect of stable signal output and improved signal-to-noise ratio

Inactive Publication Date: 2014-02-26
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0006] The purpose of the present invention is to solve the typical shortcomings of the existing Brillouin-based distributed optical fiber sensing system: BOTDR system has low signal-to-noise ratio and short sensing distance; BOTDA system has complex structure, cannot measure in real time, and is difficult to detect faults

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  • Seed injection BOTDR distributed optical fiber sensing system

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specific Embodiment approach 1

[0016] Specific implementation mode one: combine figure 1 Describe this embodiment, the seed injection BOTDR distributed optical fiber sensing system described in this embodiment includes a narrowband fiber laser 1, a first fiber coupler 2, a pump optical module 3, a fiber circulator 4, a sensing fiber 5, an optical fiber Isolator 6, seed optical module 7, polarization controller 8, second fiber coupler 9, photodetector 10 and microwave down-conversion module 11, the output end of the narrowband fiber laser 1 is connected to the input of the first fiber coupler 2 end, the first output port 2-1 of the first optical fiber coupler 2 is connected to the input end of the pumping optical module 3, and the output end of the pumping optical module 3 is connected to the first port 4-1 of the optical fiber circulator 4, and the optical fiber The second port 4-2 of the circulator 4 is connected to one end of the sensing fiber 5, the laser light output by the seed optical module 7 enters ...

specific Embodiment approach 2

[0019] Specific implementation mode two: combination figure 1 Describe this embodiment, this embodiment is a further limitation of the seed injection BOTDR distributed optical fiber sensing system described in Embodiment 1: the pump optical module 3 includes a polarization controller 3-1, an intensity modulator 3- 2. DC stabilized power supply 3-3, arbitrary waveform signal generator 3-4 and erbium-doped fiber amplifier 3-5, the optical fiber input end of the polarization controller 3-1 is connected to the first output of the first optical fiber coupler 2 Port 2-1, the output end of the polarization controller 3-1 is connected to the optical input end of the intensity modulator 3-2, and the optical output end of the intensity modulator 3-2 is connected to the seed optical input of the erbium-doped fiber amplifier 3-5 end, the output end of the erbium-doped fiber amplifier 3-5 is the output end of the pump optical module 3, the electrical signal output end of the DC stabilized ...

specific Embodiment approach 3

[0020] Specific implementation mode three: combination figure 1Describe this embodiment, this embodiment is a further limitation of the seed injection BOTDR distributed optical fiber sensing system described in Embodiment 1: the seed optical module 7 includes a fiber filter 7-1 and a broadband light source 7-2, The laser output from the broadband light source 7-2 enters the fiber isolator 6 after passing through the fiber filter 7-1.

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Abstract

The invention provides a seed injection BOTDR distributed optical fiber sensing system, relates to a seed injection Brillouin Optical Timedomain Reflectometer (BOTDR) technique, and belongs to the technical field of non-scanning type real-time measurement distributed optical fiber sensing. The seed injection BOTDR distributed optical fiber sensing system resolves the problems that an existing BOTDA system is low in signal to noise ratio, short in sensing distance and complex in structure, cannot carry out measurement in real time, and brings difficulty to fault detection. According to the seed injection BOTDR distributed optical fiber sensing system, wideband seed light covering the range of a Brillouin gain spectrum or a loss spectrum formed in sensor optical fibers through pump light is utilized to replace sweep frequency type probe laser in a traditional BOTDA system, so a frequency sweeping process is avoided, real-time sensing can be achieved, and fault detection can be completed under the circumstance of not increasing systematic complexity; the structure is simple, and compared with a BOTDR system based on a single-end method, outputting of sensing signals is more stable, sensing precision is high, and the signal to noise ratio is increased by more than 10dB within 50-80km. The seed injection BOTDR distributed optical fiber sensing system is suitable for engineering application of Brillouin optical fiber sensing.

Description

technical field [0001] The invention relates to a seed injection Brillouin optical time domain reflection technology, and belongs to the technical field of non-scanning real-time measurement distributed optical fiber sensing. Background technique [0002] In recent decades, more and more attention has been paid to the security and stability of national industry and energy supply, and the health monitoring of infrastructure has become a key link. In response to this demand, distributed optical fiber sensing systems with one-dimensional spatial continuity have been gradually developed. The distributed optical fiber sensing system based on Brillouin scattering technology has attracted extensive attention due to its ability to simultaneously monitor the temperature and strain along the optical fiber. At present, the relatively mature engineering technology is Brillouin optical time domain technology: Brillouin optical time domain reflectometry (BOTDR), Brillouin optical time do...

Claims

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Application Information

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IPC IPC(8): G01D5/353
Inventor 高玮朱智涵李宏伟刘胜男
Owner HARBIN UNIV OF SCI & TECH
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