CN102176684B - 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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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 Distributed Optical Fiber Sensing Techniques, by an optical fiber, can realize the entire and part strain information Simultaneous Monitoring to structure.
Background technology
The engineering structure health detection comprises the entire and part long term monitoring, and carries out diagnosing structural damage and necessary early warning according to result.Technology for health monitoring mainly comprises fiber Bragg grating sensor and the time-domain reflectomer based on the optical fiber Brillouin scattering (BOTDR) etc. at present.Research and engineering is actual shows, fiber bragg grating can only be as the transducer of discrete point type, and lacks the assurance to structural entity information.Fibre Optical Sensor based on Brillouin scattering is contrary, and its spatial resolution only has 1 meter but measuring distance can reach dozens or even hundreds of kilometer, and its shortcoming can only be measured the structural entity stress distribution.In engineering structure, lacking a kind of transducer can meet in very large measuring distance, whole and part information 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.With current technology, adopt this two cover system can cause monitoring cost to rise simultaneously, and the optic fibre light path that every cover system need to be independent, must lay respectively two optical fiber, cause installation of sensors flow process complexity.
Summary of the invention
The purpose of this invention is to provide a kind of distributed fiberoptic sensor of simultaneously monitoring for the strain of engineering structure entire and part, by the design optical system, make new system compatible fiber grating and Brillouin's time domain reflection technology simultaneously, the signal of energy while detection fiber grating and Brillouin's time domain reflection sense, therefore only with an optical fiber, just can realize that strain detects simultaneously to the engineering structure whole and part, this systematic survey distance, stability and repeatability are good, and precision is high and cost is low.
Technical solution of the present invention is as follows:
A kind of distributed fiberoptic sensor of simultaneously monitoring for the strain of engineering structure entire and part, comprise optical fiber DBF laser, the first fiber amplifier, the first coupler, electrooptic modulator, the second fiber amplifier, scrambler, optical fiber circulator, sensor fibre, optical fiber optical grating array, filter, the 3rd fiber amplifier, the second coupler, the brillouin scattering signal detection module, FBG Wavelength demodulation module, described optical fiber DBF laser connect successively the first fiber amplifier and the first coupler, the first output of described the first coupler described electrooptic modulator of connecting successively, the second fiber amplifier and scrambler, the output of scrambler is connected to the first input end of described optical fiber circulator, the first output of optical fiber circulator is connected with the first input end of sensor fibre, the first output of sensor fibre connects in the input of optical fiber optical grating array, the output of optical fiber optical grating array connects the second input of sensor fibre, the second output of sensor fibre connects in the second input of described optical fiber circulator, the second output of optical fiber circulator connects the input of filter, the first output of filter connects described FBG Wavelength demodulation module, the second output of filter connects the input of the 3rd fiber amplifier, the output of the 3rd fiber amplifier connects the second input of the second coupler, the first input end of the second coupler is connected with the second output of described the first coupler, the output of the 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, the first fiber amplifier, the first coupler, electrooptic modulator, the second fiber amplifier, scrambler, optical fiber circulator, sensor fibre, optical fiber optical grating array, filter, the 3rd fiber amplifier, the second coupler, brillouin scattering signal detection module, FBG Wavelength demodulation module form.Its annexation is as follows: the narrow linewidth continuous laser that optical fiber DBF laser sends enters coupler after the first fiber amplifier, then be divided into two-way, one tunnel enters the brillouin scattering signal detection module as local oscillator light after by coupler, another road light enters the second fiber amplifier after by electrooptic modulator, then via entering the second sensor fibre and optical fiber optical grating array after scrambler and optical fiber circulator.After returning to circulator, the Brillouin scattering of the second sensor fibre and the reverberation of fiber grating enter filter from another port, then from different port output.Wherein the reverberation of fiber grating directly enters FBG Wavelength demodulation module.Brillouin scattering enters the second coupler after entering the 3rd fiber amplifier, enters the brillouin scattering signal detection module together with local oscillator light.
Compared with prior art, the beneficial effect that the present invention has is: can be in cost, the effective compatible fiber grating of system and Brillouin's time domain reflection technology, but the signal of synchro measure fiber grating and Brillouin's time domain reflection sense, only with an optical fiber, just can realize that strain detects to the engineering structure whole and part simultaneously, effectively solve different fiber sensor-based system compatibility issue in the Internet of Things sensing network.And the systematic survey distance, stability and repeatability are good, and precision is high and cost is low.
The accompanying drawing explanation
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 the scope of the invention with this.
Embodiment one: below in conjunction with Fig. 1, illustrate present embodiment.Distributed Feedback Laser 1 sends narrow-linewidth laser and amplifies and enter coupler 3 and be divided into two-way through amplifier 2, 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 by 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, with laser pulse, enters sensor fibre 8 by circulator 7 simultaneously.The reflected signal light of optical fiber is divided into two parts, and a part is the backward Brillouin scattering of sensor fibre, the reverberation that another part is optical fiber optical grating array.This two parts light, by design in advance, takies respectively different wavelength channels, thereby can mutually not crosstalk.After this two parts reverberation enters filter via circulator 7, filtered device separately and from different ports is exported.Wherein Brillouin scattering is after fiber amplifier 11 amplifies, by coupler 12 with enter brillouin scattering signal detection module 13 with local oscillator light simultaneously, carry out input.The reverberation of fiber grating directly enters FBG Wavelength demodulation module 14.
For the Fibre Optical Sensor of Brillouin scattering part, whole optical fiber is all 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, the strain of the position at grating place only can be detected, and the length of a grating only there is 1 centimetre of left and right, 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 respectively frequency displacement and the optical grating reflection wavelength change of Brillouin scattering 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. a distributed fiberoptic sensor of simultaneously monitoring for the strain of engineering structure entire and part, it is characterized in that: comprise optical fiber DBF laser (1), the first fiber amplifier (2), the first coupler (3), electrooptic modulator (4), the 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), the second coupler (12), brillouin scattering signal detection module (13), FBG Wavelength demodulation module (14), described optical fiber DBF laser (1) connect successively the first fiber amplifier (2) and the first coupler (3), the first output of described the first coupler (3) described electrooptic modulator (4) of connecting successively, the 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), the first output of optical fiber circulator (7) is connected with the first input end of sensor fibre (8), the 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 the second input of sensor fibre (8), the second output of sensor fibre (8) connects in the second input of described optical fiber circulator (7), the second output of optical fiber circulator (7) connects the input of filter (10), the first output of filter (10) connects described FBG Wavelength demodulation module (14), the second output of filter (10) connects the input of the 3rd fiber amplifier (11), the output of the 3rd fiber amplifier (11) connects the second input of the second coupler (12), the first input end of the second coupler (12) is connected with the second output of described the first coupler (3), the output of the second coupler (12) connects described brillouin scattering signal detection module (13).
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| 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 |
| CN103503337B (en) * | 2013-01-15 | 2016-01-20 | 华为海洋网络有限公司 | A kind of communication equipment and method |
| 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 |
| 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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