CN102176684A - Distributed optical fiber sensor for simultaneously monitoring engineering structure entirety and local strain - Google Patents
Distributed optical fiber sensor for simultaneously monitoring engineering structure entirety and local strain Download PDFInfo
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- CN102176684A CN102176684A CN2011100694305A CN201110069430A CN102176684A CN 102176684 A CN102176684 A CN 102176684A CN 2011100694305 A CN2011100694305 A CN 2011100694305A CN 201110069430 A CN201110069430 A CN 201110069430A CN 102176684 A CN102176684 A CN 102176684A
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Abstract
The invention discloses a distributed optical fiber sensor for simultaneously monitoring engineering structure entirety and local strain. The distributed optical fiber sensor comprises an optical fiber distributed feedback (DBF) laser, a first optical fiber amplifier, a first coupler, a photoelectric modulator, a second optical fiber amplifier, a polarization scrambler, an optical fiber circulator, a sensing optical fiber, an optical fiber grid array, a filter, a third optical fiber amplifier, a second coupler, a Brillouin scattered signal detecting module and a fiber Bragg grating (FBG) wavelength demodulating module. Compared with the prior art, the distributed optical fiber sensor has the advantages that: the cost is reduced; the sensor can be effectively compatible with the optical fiber grid and a Brillouin time domain reflecting technology; signals sensed by the optical fiber grid and the Brillouin time domain reflection are synchronously measured; the engineering structure entirety and the local strain can be simultaneously monitored by only one optical fiber; the problem of compatibility of different optical fiber sensing systems in things Internet sensing network is solved; and the sensor is long in measuring distance, good in stability, good in repeatability, high in precision and low in cost.
Description
Technical field
The present invention relates to a kind of distributing optical fiber sensing technology, can realize the integral body and the local train information synchronization of structure are monitored by an optical fiber.
Background technology
The engineering structure health detection comprises whole and local long term monitoring, and carries out diagnosing structural damage and necessary early warning according to the result.The technology that is used for health monitoring at present mainly comprises fiber Bragg grating sensor and based on time-domain reflectomer (BOTDR) of optical fiber Brillouin scattering etc.Research and engineering is actual shows, optical fiber FBG grating can only be as the transducers of discrete point type, and lack the assurance to structural entity information.Fibre Optical Sensor based on Brillouin scattering is then opposite, and its spatial resolution only has 1 meter but measuring distance can reach dozens or even hundreds of kilometer, and its shortcoming is to measure the structural entity stress distribution.In actual engineering structure, lacking a kind of transducer can satisfy in very big measuring distance, integral body and local message that simultaneously can fusion structure, realization is to the safety evaluation of structural entity and the precise monitoring of local key point, and this long-term health to heavy construction detects significant.Adopt this two cover system can cause the monitoring cost to rise simultaneously with present technology, and the optic fibre light path that every cover system need be independent, must lay two optical fiber respectively, cause transducer installation procedure complexity.
Summary of the invention
The purpose of this invention is to provide a kind of whole distributed fiberoptic sensor of monitoring simultaneously of engineering structure that is used for local train, by the design optical system, make new system compatible fiber grating and Brillouin's Time Domain Reflectometry technology simultaneously, the signal of energy while detection fiber grating and Brillouin's time domain reflection sense, therefore only just can realize engineering structure integral body and local train are detected simultaneously with an optical fiber, this systematic survey distance, stability and repeatability are good, and precision height and cost are low.
Technical solution of the present invention is as follows:
A kind of whole distributed fiberoptic sensor of monitoring simultaneously of engineering structure that is used for local train, comprise optical fiber DBF laser, first fiber amplifier, first coupler, electrooptic modulator, second fiber amplifier, scrambler, optical fiber circulator, sensor fibre, optical fiber optical grating array, filter, the 3rd fiber amplifier, second coupler, the brillouin scattering signal detection module, FBG Wavelength demodulation module, described optical fiber DBF laser connect successively first fiber amplifier and first coupler, first output of the described first coupler described electrooptic modulator of connecting successively, second fiber amplifier and scrambler, the output of scrambler is connected to the first input end of described optical fiber circulator, first output of optical fiber circulator is connected with the first input end of sensor fibre, first output of sensor fibre connects in the input of optical fiber optical grating array, the output of optical fiber optical grating array connects second input of sensor fibre, second output of sensor fibre connects in second input of described optical fiber circulator, second output of optical fiber circulator connects the input of filter, first output of filter connects described FBG Wavelength demodulation module, second output of filter connects the input of the 3rd fiber amplifier, the output of the 3rd fiber amplifier connects second input of second coupler, the first input end of second coupler is connected with second output of described first coupler, and the output of second coupler connects described brillouin scattering signal detection module.
Transducer of the present invention, it is a kind of distributed sensor that merges fiber grating and Brillouin's time-domain reflectomer, its formation is by optical fiber DBF laser, first fiber amplifier, first coupler, electrooptic modulator, second fiber amplifier, scrambler, optical fiber circulator, sensor fibre, optical fiber optical grating array, filter, the 3rd fiber amplifier, second coupler, brillouin scattering signal detection module, FBG Wavelength demodulation module are formed.Its annexation is as follows: the narrow linewidth continuous laser that optical fiber DBF laser sends enters coupler after through first fiber amplifier, be divided into two-way then, one the tunnel enters the brillouin scattering signal detection module as local oscillator light after by coupler, another road light enters second fiber amplifier after by electrooptic modulator, then via entering second sensor fibre and optical fiber optical grating array behind scrambler and the optical fiber circulator.After returning circulator, the Brillouin scattering of second sensor fibre and the reverberation of fiber grating enter filter, then from different port outputs from the another port.Wherein the reverberation of fiber grating directly enters FBG Wavelength demodulation module.Brillouin scattering enters second coupler after then entering the 3rd fiber amplifier, enters the brillouin scattering signal detection module with local oscillator light.
Compared with prior art, the beneficial effect that the present invention has is: can be when cost reduces, the effective compatible fiber grating of system and Brillouin's Time Domain Reflectometry technology, but the signal of synchro measure fiber grating and Brillouin's time domain reflection sense, only just can realize engineering structure integral body and local train are detected simultaneously, solve different fiber sensor-based system compatibility issue in the Internet of Things sensing network effectively with an optical fiber.And the systematic survey distance, stability and repeatability are good, and precision height and cost are low.
Description of drawings
Fig. 1 is a kind of concrete structure schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is elaborated, but should not limit protection scope of the present invention with this.
Embodiment one: specify present embodiment below in conjunction with Fig. 1.Distributed Feedback Laser 1 sends narrow-linewidth laser and amplifies through amplifier 2 and enter coupler 3 and be divided into two-way, one road light enters brillouin scattering signal detection module 13 as local oscillator light after by coupler 12, another road as sense light through electrooptic modulator 4 be modulated to pulsed light after amplifier 5 enter scrambler 6 carry out depolarized after, enter sensor fibre 8 by optical fiber circulator 7.Meanwhile, fiber amplifier 5 can send the ASE broadband light, and this part light can be used as the sensing light source of optical fiber optical grating array 9, enters sensor fibre 8 by circulator 7 simultaneously with laser pulse.The reflected signal light of optical fiber is divided into two parts, and a part is the back to Brillouin scattering of sensor fibre, and another part is the reverberation of optical fiber optical grating array.This two parts light takies different wavelength channels respectively, thereby can not crosstalk mutually by design in advance.After this two parts reverberation entered filter via circulator 7, filtered device separately and from different ports was exported.Wherein Brillouin scattering is after fiber amplifier 11 amplifies, by coupler 12 with enter brillouin scattering signal detection module 13 simultaneously with local oscillator light, carry out input.The reverberation of fiber grating then directly enters FBG Wavelength demodulation module 14.
For the Fibre Optical Sensor of Brillouin scattering part, whole optical fiber all is strain transducer but its spatial resolution only has 1 meter, because its measuring distance can reach dozens or even hundreds of kilometer, therefore can be used for the structure collectivity monitoring.For optical fiber optical grating array, only can detect the strain of the position at grating place, and the length of a grating only has about 1 centimetre, volume is very little, therefore can carry out the strain measurement of some local significant points.When the strain that acts on sensor fibre 8 and optical fiber optical grating array 9 changes, the catoptrical wavelength of the frequency of Brillouin scattering and fiber grating also can change thereupon, survey the frequency displacement and the optical grating reflection wavelength change of Brillouin scattering respectively by brillouin scattering signal detection module 13 and FBG Wavelength demodulation module 14, can obtain the local train of structural entity stress distribution situation and keypoint part simultaneously.
Claims (1)
1. one kind is used for the whole distributed fiberoptic sensor of monitoring simultaneously with local train of engineering structure, it is characterized in that: comprise optical fiber DBF laser (1), first fiber amplifier (2), first coupler (3), electrooptic modulator (4), second fiber amplifier (5), scrambler (6), optical fiber circulator (7), sensor fibre (8), optical fiber optical grating array (9), filter (10), the 3rd fiber amplifier (11), second coupler (12), brillouin scattering signal detection module (13), FBG Wavelength demodulation module (14), described optical fiber DBF laser (1) connect successively first fiber amplifier (2) and first coupler (3), first output of described first coupler (3) the described electrooptic modulator (4) of connecting successively, second fiber amplifier (5) and scrambler (6), the output of scrambler (6) is connected to the first input end of described optical fiber circulator (7), first output of optical fiber circulator (7) is connected with the first input end of sensor fibre (8), first output of sensor fibre (8) connects in the input of optical fiber optical grating array (9), the output of optical fiber optical grating array (9) connects second input of sensor fibre (8), second output of sensor fibre (8) connects in second input of described optical fiber circulator (7), second output of optical fiber circulator (7) connects the input of filter (10), first output of filter (10) connects described FBG Wavelength demodulation module (14), second output of filter (10) connects the input of the 3rd fiber amplifier (11), the output of the 3rd fiber amplifier (11) connects second input of second coupler (12), the first input end of second coupler (12) is connected with second output of described first coupler (3), and the output of second coupler (12) connects described brillouin scattering signal detection module (13).
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| CN102352964A (en) * | 2011-10-09 | 2012-02-15 | 山东大学 | Thermal fluid leak detecting and positioning system based on integrated fiber grating cluster |
| CN103503337A (en) * | 2013-01-15 | 2014-01-08 | 华为海洋网络有限公司 | Communication apparatus and method |
| CN105115525A (en) * | 2015-08-28 | 2015-12-02 | 东南大学 | Optical fiber sensing network integrated synchronization collinear demodulation system and sensing system |
| CN111504214A (en) * | 2020-03-27 | 2020-08-07 | 中国特种设备检测研究院 | Large crude oil storage tank body deformation optical fiber monitoring device, system and method |
| CN111707208A (en) * | 2020-06-24 | 2020-09-25 | 东南大学 | Cylindrical shell structure cross section deformation monitoring method based on distributed macro strain sensing |
| US11050830B1 (en) | 2020-10-13 | 2021-06-29 | United Arab Emirates University | Smart real-time prediction system for power transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102352964A (en) * | 2011-10-09 | 2012-02-15 | 山东大学 | Thermal fluid leak detecting and positioning system based on integrated fiber grating cluster |
| CN102352964B (en) * | 2011-10-09 | 2013-04-10 | 山东大学 | Thermal fluid leak detecting and positioning system based on integrated fiber grating cluster |
| CN103503337A (en) * | 2013-01-15 | 2014-01-08 | 华为海洋网络有限公司 | Communication apparatus and method |
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| CN105115525A (en) * | 2015-08-28 | 2015-12-02 | 东南大学 | Optical fiber sensing network integrated synchronization collinear demodulation system and sensing system |
| CN105115525B (en) * | 2015-08-28 | 2018-01-02 | 东南大学 | A kind of conllinear demodulating system of optical fiber sensing network Integral synchronous and sensor-based system |
| CN111504214A (en) * | 2020-03-27 | 2020-08-07 | 中国特种设备检测研究院 | Large crude oil storage tank body deformation optical fiber monitoring device, system and method |
| CN111504214B (en) * | 2020-03-27 | 2021-06-08 | 中国特种设备检测研究院 | Optical fiber monitoring method for deformation of large crude oil storage tank body |
| CN111707208A (en) * | 2020-06-24 | 2020-09-25 | 东南大学 | Cylindrical shell structure cross section deformation monitoring method based on distributed macro strain sensing |
| US11050830B1 (en) | 2020-10-13 | 2021-06-29 | United Arab Emirates University | Smart real-time prediction system for power transmission |
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