CN105890797B - EO-1 hyperion Rayleigh-Brillouin light domain reflectometer that temperature and stress detect simultaneously - Google Patents
EO-1 hyperion Rayleigh-Brillouin light domain reflectometer that temperature and stress detect simultaneously Download PDFInfo
- Publication number
- CN105890797B CN105890797B CN201610346029.4A CN201610346029A CN105890797B CN 105890797 B CN105890797 B CN 105890797B CN 201610346029 A CN201610346029 A CN 201610346029A CN 105890797 B CN105890797 B CN 105890797B
- Authority
- CN
- China
- Prior art keywords
- fiber
- brillouin
- rayleigh
- unit
- optical fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000835 fiber Substances 0.000 claims abstract description 110
- 238000001228 spectrum Methods 0.000 claims abstract description 79
- 239000013307 optical fiber Substances 0.000 claims abstract description 75
- 238000000034 method Methods 0.000 claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 230000003287 optical effect Effects 0.000 claims abstract description 22
- 230000003595 spectral effect Effects 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 12
- 230000000737 periodic effect Effects 0.000 claims abstract description 9
- 239000000523 sample Substances 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000010287 polarization Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 3
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 3
- 230000005693 optoelectronics Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 210000001367 artery Anatomy 0.000 claims description 2
- 210000003462 vein Anatomy 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000001427 coherent effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000004038 photonic crystal Substances 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000010259 detection of temperature stimulus Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009510 drug design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003938 response to stress Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
Abstract
The invention discloses the Rayleigh Brillouin light domain reflectometers that a kind of temperature and stress detect simultaneously, it utilizes the periodic structure of optical fiber F P interferometers, it is long by the chamber for scanning optical fiber F P interferometers, while obtaining fiber Rayleigh back scattering spectrum and optical fiber Brillouin scattering spectra.The reflectometer includes sequentially connected optical emitting unit, detection object element, filter unit, spectral scan unit, detector cells, data acquisition and processing (DAP) unit, wherein, data acquisition and processing (DAP) unit completes the inverting to temperature and stress, specially first use LPR (Landau Placzek Ratio) inversion method fiber optic temperature, Brillouin shift inverting fiber stress is used again, to be sensed while realizing temperature and stress.The invention has many advantages, such as that at low cost, detection range is long, detection accuracy is high, spatial resolution is high, inversion method is simple, data operation quantity is small.
Description
Technical field
The EO-1 hyperion detected simultaneously the present invention relates to distributing optical fiber sensing field more particularly to a kind of temperature and stress is auspicious
Profit-Brillouin light domain reflectometer.
Background technology
Optical fiber sensing technology is to be risen with the development of Fibre Optical Communication Technology at the end of the seventies in last century, is to carry with light wave
Body, optical fiber are medium.Fibre Optical Sensor is widely used in the detections such as temperature, stress, electric field, magnetic field, displacement, have high sensitivity,
Electrical insulating property is good, electromagnetism interference, is easily achieved and the advantages that high certainty of measurement, comes into aerospace, biologic medical, state
The every field such as anti-military affairs, industry, communications and transportation.Wherein Distributed Optical Fiber Sensing Techniques, which remove, has the advantages that general fibre optical sensor
Outside, measured spatial distribution state can be also obtained simultaneously and changes over time information, especially suitable for civil engineering, oil
The large scales such as work, power industry, long range, high-risk field.
In distributing optical fiber sensing, the sensing technology based on Brillouin scattering is widely studied.One in this technology
Must solve the problems, such as it is temperature and stress information if simultaneously in detection optical fiber.This is because Brillouin shift is proportional to temperature
Degree and stress variation, theoretically can not from frequency displacement simultaneously Extracting temperature and stress information.Between in the past twenty years, in order to
It solves this Study on Problems personnel and proposes following several method.
1, the method most generally used be by and meanwhile measure Brillouin shift and Power of Brillouin with Simultaneous Inversion optical fiber
In temperature and stress information.However, due to the disturbance of polarization state and the bending loss etc. of optical fiber, Power of Brillouin is difficult
It is accurate to measure, it is low so as to cause the detection accuracy of this method.
2, in order to avoid Power of Brillouin measures, a method of it is detected simultaneously into trip temperature and stress based on special fiber
It is suggested.The special fiber used includes large effective area fiber (Large-effective-area fiber), photon crystalline substance
Body optical fiber (photonic crystal fiber) and less fundamental mode optical fibre (few-mode fiber).The Brillouin spectrum of these optical fiber has
There is multi-peaks structure, and the centre frequency at each peak has different temperature and stress response.However, there is following lack in this method
Point, 1) using in the method for large effective area fiber, due to the interference between each wavelength, cause that its spatial resolution is low, measures
The defects of precision is low, measurement distance is short；2) method based on photonic crystal fiber overcomes the interference between wavelength, however, its
Complicated pulling process makes that it is expensive, increases cost.
3, by combining distributed Raman sensor to complete temperature and stress it is detected while, wherein distributed Raman senses
Device is used for the detection of temperature, and distributed Brillouin sensing device is used for stress detection.The defect of this method is two class sensors
In conjunction with making system become increasingly complex.
4, by being simutaneously arranged two optical fiber, wherein an optical fiber is acted on by temperature and stress simultaneously, in addition one
Optical fiber makes it not by isolation to be influenced by stress, to reach Simultaneous Inversion temperature and strain information.But problem is, works as light
When fibre is applied to the environment such as liquid, system can not influence of the isolated pressure to optical fiber.
Invention content
The object of the present invention is to provide EO-1 hyperion Rayleigh-Brillouin light Time Domain Reflectometries that a kind of temperature and stress detect simultaneously
Meter, has many advantages, such as that high spectral resolution, high spatial resolution, high measurement accuracy, compact-sized, data processing is simple.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of Rayleigh-Brillouin light domain reflectometer of temperature and stress detection simultaneously, including：Optical emitting unit 10,
Detect object element 20, filter unit 30, spectral scan unit 40, detector cells 50, data acquisition and processing (DAP) unit 60；Its
In：
The optical emitting unit 10 is for emitting pulse modulated and amplified laser pulse；The probe unit 20
For guiding laser pulse into reference optical fiber and detection optical fiber, and corresponding echo-signal is transferred to filter unit
30；The filter unit 30 for reducing in echo-signal Rayleigh beacon signal and filter out brillouin scattering signal, from
And keep Rayleigh beacon suitable with brillouin scattering signal；The spectral scan unit 40 is defeated for scan-filtering unit 30
Go out as a result, obtaining Rayleigh scattering spectrum and Brillouin spectrum；The detector cells 50 are used for the defeated of spectral scan unit 40
Go out signal and carries out opto-electronic conversion；The data acquisition and processing (DAP) unit 60 is for acquiring electric signal, and temperature suffered by inverting optical fiber
And stress information.
The optical emitting unit 10 includes 1.5 μm of laser light sources 11, impulse generator 12 and erbium-doped fiber amplifier 13；
Wherein, 1.5 μm of continuous lasers of 1.5 μm of laser light sources 11 outgoing cut into pulsed light, pulsed light by impulse generator 12
Amplified again by erbium-doped fiber amplifier 13, to generate the laser pulse for meeting Fibre Optical Sensor requirement；
The impulse generator 12 is electrooptic modulator or acousto-optic modulator.
The detection object element 20 includes：Optical fiber circulator 21, reference optical fiber 22 and sensor fibre 23；Wherein, laser
Pulse is incident from the ports a of optical fiber circulator 21, and reference optical fiber 22 and sensor fibre 23, echo-signal are respectively enterd from the ports b
The ports b through optical fiber circulator 21 return, and by c port transmissions to filter unit 30；
The reference optical fiber 22 and sensor fibre 23 are single mode optical fiber or polarization maintaining optical fibre.
The filter unit 30 is fiber bragg grating, molecular filter device, Mach Zehnder interferometer or sagnac rings.
The spectral scan unit 40 includes：Fiber optic splitter 41, fiber F-P interferometer 42, the control of fiber F-P interferometer
Device 43 and constant temperature and pressure device 44；Wherein, 30 processed echo-signal of filter unit is divided into two through fiber optic splitter 41,
Middle portion light enters probe unit 50 from the ports a of fiber optic splitter 41 after fiber F-P interferometer 42, in addition a from optical fiber
The ports b of beam splitter 41 are directly entered probe unit 50；Fiber F-P interferometer controller 43 is for scanning fiber F-P interferometer
42 chamber is long, and constant temperature and pressure device 44 is for ensuring that fiber F-P interferometer 42 works under constant temperature and pressure.
The acquisition Rayleigh scattering spectrum and Brillouin spectrum include：
It is dry by setting fiber F-P using the Periodic Interference structure of fiber F-P interferometer 42 based on vernier caliper principle
The parameter of interferometer 42, then it is long by the chamber of the scanning fiber F-P of fiber F-P interferometer controller 43 interferometer 42, to obtain optical fiber
Rayleigh scattering spectrum and Brillouin spectrum；
Assuming that when NFSR ≠ R_B (N=0,1,2,3......), wherein FSR is freely composing for fiber F-P interferometer 42
Spacing, R_B are the spacing ≈ 11.2GHz of Rayleigh scattering spectrum and Brillouin spectrum；When fiber F-P interferometer controller 43 scans
When the chamber of fiber F-P interferometer 42 is long, the Rayleigh scattering spectrum and Brillouin spectrum of optical fiber can be successively obtained, and between the two spectrums
Away from scan frequency be NFSR-11.2GHz.
The probe unit 50 is indium gallium arsenic single-photon detector, upper conversion single-photon detector or superconducting single-photon detection
Device.
The data acquisition and processing (DAP) unit 60 includes：Capture card 61, computer 62 and arbitrary-function generator 63；Its
In, the arbitrary function transmitter 63 is used to trigger the impulse generator 12 and capture card 61 in synchronous optical transmitter unit 10,
The computer 62 is used for through temperature and stress information suffered by preset algorithm inverting optical fiber.
Temperature and the refutation process of stress information include suffered by the optical fiber：
Chamber length by scanning F-P interferometers obtains Brillouin spectrum and Rayleigh scattering spectrum, to the auspicious of unit distance Bin
Sharp scattering spectra and Brillouin spectrum are rebuild, and to after reconstruction Rayleigh scattering spectrum and Brillouin spectrum be fitted,
Acquire the ratio LPR of Rayleigh scattering power and Brillouin scattering power；Rayleigh scattering spectrum peak and Brillouin spectrum are calculated again
The spacing of peak position；
Fiber optic temperature information is calculated by LPR, then passes through Brillouin shift inverting fiber stress information.
As seen from the above technical solution provided by the invention, it 1) is based on vernier caliper principle, is interfered using fiber F-P
The Periodic Interference structure of instrument, it is long by the chamber for scanning fiber F-P interferometer by rationally designing the parameter of fiber F-P interferometer,
The Rayleigh scattering spectrum and Brillouin spectrum of high spectral resolution are obtained simultaneously.2) pass through Landau-Placzek ratio (LPR)
Method calculates fiber optic temperature distribution, is distributed by Brillouin shift inverting stress.By combining two kinds of method for sensing and two to dissipate
Spectrum is penetrated, the cross-interference issue between temperature sensing and stress sensing is effectively prevented.3) compared to use special optical fiber with and meanwhile pass
The method of temperature-sensitive degree and stress, the method which is proposed is at low cost, detection range is long, detection accuracy is high, space point
The advantages that resolution is high.4) it is provided simultaneously with the excellent of Rayleigh optical time domain reflectometer (OTDR) and Brillouin light domain reflectometer (BOTDR)
Point, not only can sensor fibre temperature and the also detectable defect of optical fiber of stress information, what is particularly worth mentioning is that, which can be same
When obtain Brillouin spectrum and Rayleigh spectrum, therefore calculate Brillouin shift be with Rayleigh be reference, in the feelings of no reference optical fiber
Lower of condition accurate can obtain Extracting temperature and stress information.5) use incoherent technique, compared to using coherent detection method,
Its data collection capacity is small, and operation pressure is small, and inversion method is simply direct.The present invention cleverly utilizes the week of fiber F-P interferometer
Phase interference structure, can high spectral resolution, high time resolution must obtain fiber Rayleigh scattering spectrum and Brillouin spectrum, this is phase
Dry detection is incomparable.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
When Fig. 1 is a kind of temperature provided in an embodiment of the present invention and stress while EO-1 hyperion Rayleigh-Brillouin light of detection
The structural schematic diagram of domain reflectometer；
Fig. 2 is the method signal that high spectral resolution provided in an embodiment of the present invention obtains fiber Rayleigh-Brillouin spectrum
Figure.
Specific implementation mode
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
When Fig. 1 is a kind of temperature provided in an embodiment of the present invention and stress while EO-1 hyperion Rayleigh-Brillouin light of detection
The structural schematic diagram of domain reflectometer.As shown in Figure 1, it includes mainly：Optical emitting unit 10, detection object element 20, filtering
Unit 30, spectral scan unit 40, detector cells 50, data acquisition and processing (DAP) unit 60；Wherein：
The optical emitting unit 10 is for emitting pulse modulated and amplified laser pulse；The probe unit 20
For guiding laser pulse into reference optical fiber and detection optical fiber, and corresponding echo-signal is transferred to filter unit
30；The filter unit 30 for reducing in echo-signal Rayleigh beacon signal and filter out brillouin scattering signal, from
And keep Rayleigh beacon suitable with brillouin scattering signal；The spectral scan unit 40 is defeated for scan-filtering unit 30
Go out as a result, obtaining Rayleigh scattering spectrum and Brillouin spectrum；The detector cells 50 are used for the defeated of spectral scan unit 40
Go out signal and carries out opto-electronic conversion；The data acquisition and processing (DAP) unit 60 is for acquiring electric signal, and temperature suffered by inverting optical fiber
And stress information.
Above-mentioned each unit is specific as follows：
1, the optical emitting unit 10 includes 1.5 μm of laser light sources 11, impulse generator 12 and Erbium-doped fiber amplifier
Device 13；Wherein, 1.5 μm of continuous lasers of 1.5 μm of laser light sources 11 outgoing cut into pulsed light, arteries and veins by impulse generator 12
It washes off and is amplified again by erbium-doped fiber amplifier 13, to generate the laser pulse for meeting Fibre Optical Sensor requirement；The pulse hair
Raw device 12 is electrooptic modulator or acousto-optic modulator.
In addition, the laser light source in the optical emitting unit 10 can also be the other types for meeting Fibre Optical Sensor requirement
Laser.
2, the detection object element 20 includes：Optical fiber circulator 21, reference optical fiber 22 and sensor fibre 23；Wherein,
Laser pulse is incident from the ports a of optical fiber circulator 21, and reference optical fiber 22 and sensor fibre 23, echo are respectively enterd from the ports b
B port of the signal through optical fiber circulator 21 returns, and by c port transmissions to filter unit 30；The reference optical fiber 22 and biography
Photosensitive fine 23 be single mode optical fiber or polarization maintaining optical fibre.
3, the filter unit 30 is fiber bragg grating, molecular filter device, Mach Zehnder interferometer or sagnac rings；
Can also be other devices with similar functions.
4, the spectral scan unit 40 includes：Fiber optic splitter 41, fiber F-P interferometer 42, fiber F-P interfere instrument control
Device 43 and constant temperature and pressure device 44 processed；Wherein, 30 processed echo-signal of filter unit is divided into two through fiber optic splitter 41,
A copy of it light enters probe unit 50 from the ports a of fiber optic splitter 41 after fiber F-P interferometer 42, in addition a from light
The ports b of fine beam splitter 41 are directly entered probe unit 50；Fiber F-P interferometer controller 43 is for scanning fiber F-P interference
The chamber of instrument 42 is long, and constant temperature and pressure device 44 is for ensuring that fiber F-P interferometer 42 works under constant temperature and pressure.
The acquisition Rayleigh scattering spectrum and Brillouin spectrum include：
It is dry by setting fiber F-P using the Periodic Interference structure of fiber F-P interferometer 42 based on vernier caliper principle
The parameter of interferometer 42, then it is long by the chamber of the scanning fiber F-P of fiber F-P interferometer controller 43 interferometer 42, to obtain optical fiber
Rayleigh scattering spectrum and Brillouin spectrum；
Assuming that when NFSR ≠ R_B (N=0,1,2,3......), wherein FSR is freely composing for fiber F-P interferometer 42
Spacing, R_B are the spacing ≈ 11.2GHz of Rayleigh scattering spectrum and Brillouin spectrum；When fiber F-P interferometer controller 43 scans
When the chamber of fiber F-P interferometer 42 is long, the Rayleigh scattering spectrum and Brillouin spectrum of optical fiber can be successively obtained, and between the two spectrums
Away from scan frequency be NFSR-11.2GHz.
As shown in Fig. 2, to obtain the method schematic diagram of fiber Rayleigh-Brillouin spectrum.
As shown in Fig. 2 (1), in optical fiber back scattering spectrum, Rayleigh scattering is elastic scattering, frequency and incident light frequency one
It causing, Brillouin scattering is inelastic scattering, and frequency displacement is about 11.2GHz, and wherein frequency reduction is Stokes Brillouin scattering,
Raised frequency is anti-Stokes Brillouin scattering.Wherein, spontaneous brillouin scattering about 18dB small compared with Rayleigh scattering.
In the present invention, while by using filter unit 30 to reduce Rayleigh beacon signal, filters out Brillouin and dissipate
Signal is penetrated, as shown in Fig. 2 (2).Wherein filter unit is including but not limited to fiber bragg grating, molecular filter device, Mach pool
Deccan interferometer and sagnac rings.
The ingenious place of the present invention is the Periodic Interference structure using fiber F-P interferometer, using vernier caliper principle,
By the running parameter of optimization design fiber F-P interferometer, optical fiber can be successively obtained when the chamber for scanning fiber F-P interferometer is long
Rayleigh is composed and Brillouin spectrum.Shown in the periodic structure of fiber F-P interferometer such as Fig. 2 (3), when the chamber for scanning F-P interferometers is long,
Optical fiber rayleigh scattering spectrum and Brillouin spectrum can be continuously obtained, as shown in Fig. 2 (4).For example, when optical fiber Fabry Perot
When freely to compose spacing be 4GHz, the rayleigh scattering spectrum for scanning acquisition is spaced about 43-11.2=with Brillouin spectrum
0.8GHz, when the fineness of Fabry Perot is 40, full width at half maximum 100MHz.
It is worth noting that, Fig. 2 is while filtering out Stokes Brillouin scattering and anti-Stokes Brillouin scattering
Situation in practical application, according to selected filter unit, can also just filter out Stokes Brillouin scattering and Rayleigh scattering, or
Filter out anti-Stokes Brillouin scattering and Rayleigh scattering.
5, the probe unit 50 is that indium gallium arsenic single-photon detector, upper conversion single-photon detector or superconducting single-photon are visited
Survey device.
6, the data acquisition and processing (DAP) unit 60 includes：Capture card 61, computer 62 and arbitrary-function generator 63；Its
In, the arbitrary function transmitter 63 is used to trigger the impulse generator 12 and capture card 61 in synchronous optical transmitter unit 10,
The computer 62 is used for through temperature and stress information suffered by preset algorithm inverting optical fiber.
Temperature and the refutation process of stress information include suffered by the optical fiber：
In the case that scanning obtains Brillouin spectrum and Rayleigh scattering spectrum, and sensor fibre has been demarcated, to unit
Distance Bin Rayleigh scattering spectrum and Brillouin spectrum is rebuild, and to after reconstruction Rayleigh scattering spectrum and Brillouin scattering
Spectrum is fitted, and acquires the ratio LPR of Rayleigh scattering power and Brillouin scattering power；Rayleigh scattering spectrum peak and cloth are calculated again
In deep scattering spectra peak position spacing BS；
Fiber optic temperature information is calculated by LPR, then passes through Brillouin shift inverting fiber stress information.
Rayleigh-Brillouin light domain reflectometer that a kind of temperature provided in an embodiment of the present invention and stress detect simultaneously has
Following advantageous effect：
1, the present invention is based on vernier caliper principles passes through rational design using the Periodic Interference structure of fiber F-P interferometer
The parameter of fiber F-P interferometer, long by the chamber for scanning fiber F-P interferometer, high spectral resolution obtains the Rayleigh scattering of optical fiber
Spectrum and Brillouin spectrum.
2, the present invention calculates fiber optic temperature distribution by LPR methods, is distributed by Brillouin shift inverting inverting stress.It is logical
It crosses and combines two kinds of method for sensing and two scattering spectras, effectively reduce the cross-interference issue between temperature sensing and stress sensing.
3, compared to special optical fiber is used, in the method for sensing temperature and stress simultaneously, the method that the invention is proposed has
At low cost, the advantages that detection range is long, detection accuracy is high, spatial resolution is high.
4, the method that the invention is proposed is provided simultaneously with Rayleigh optical time domain reflectometer (OTDR) and Brillouin light Time Domain Reflectometry
The advantages of counting (BOTDR), not only can sensor fibre temperature and the also detectable defect of optical fiber of stress information, and pass through this method
Detection and the Brillouin shift calculated are the absolute frequency displacements apart from Rayleigh, and appointing without necessarily referring to optical fiber can be accurate
Obtain Extracting temperature and stress information.
5, the method used in the invention uses incoherent technique, and compared to the method using coherent detection, data are adopted
Collection amount is small, and operation pressure is small, and inversion method is simply direct.What is particularly worth mentioning is that the present invention is cleverly dry using fiber F-P
The Periodic Interference structure of interferometer, can high spectral resolution, high time resolution must obtain fiber Rayleigh scattering spectrum and Brillouin scattering
Spectrum, this be coherent detection it is incomparable.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (7)
1. Rayleigh-Brillouin light domain reflectometer that a kind of temperature and stress detect simultaneously, which is characterized in that including：Optics is sent out
Penetrate unit (10), detection object element (20), filter unit (30), spectral scan unit (40), detector cells (50), data
Acquisition and processing unit (60)；Wherein：
The optical emitting unit (10) is for emitting pulse modulated and amplified laser pulse；The probe unit (20)
For guiding laser pulse into reference optical fiber and detection optical fiber, and corresponding echo-signal is transferred to filter unit
(30)；The filter unit (30) is believed for reducing the Rayleigh beacon signal in echo-signal with Brillouin scattering is filtered out
Number, to keep Rayleigh beacon signal suitable with brillouin scattering signal；The spectral scan unit (40) is filtered for scanning
The output of wave unit (30) is as a result, obtain Rayleigh scattering spectrum and Brillouin spectrum；The detector cells (50) are used for light
The output signal for composing scanning element (40) carries out opto-electronic conversion；The data acquisition and processing (DAP) unit (60) is for acquiring telecommunications
Number, and temperature and stress information suffered by inverting optical fiber；
Wherein, the spectral scan unit (40) includes：Fiber optic splitter (41), fiber F-P interferometer (42), fiber F-P are dry
Interferometer controller (43) and constant temperature and pressure device (44)；Wherein, filter unit (30) processed echo-signal is through fiber beam splitting
Device (41) is divided into two, and a copy of it light enters detection from the ports a of fiber optic splitter (41) after fiber F-P interferometer (42)
Unit (50), it is in addition a to be directly entered probe unit (50) from the ports b of fiber optic splitter (41)；Fiber F-P interferes instrument control
The chamber that device (43) processed is used to scan fiber F-P interferometer (42) is long, and constant temperature and pressure device (44) is for ensuring fiber F-P interferometer
(42) it works under constant temperature and pressure；
The acquisition Rayleigh scattering spectrum and Brillouin spectrum include：Based on vernier caliper principle, fiber F-P interferometer is utilized
(42) Periodic Interference structure, by the parameter of setting fiber F-P interferometer (42), then by fiber F-P interferometer controller
(43) chamber of scanning fiber F-P interferometer (42) is long, to obtain the Rayleigh scattering spectrum and Brillouin spectrum of optical fiber；Assuming that
NFSR ≠ R_B, N=0,1, when 2,3......, wherein FSR is that fiber F-P interferometer (42) freely composes spacing, and R_B is
Rayleigh scattering composes the spacing ≈ 11.2GHz with Brillouin spectrum；When fiber F-P interferometer controller (43) scans fiber F-P
When the chamber of interferometer (42) is long, the Rayleigh scattering spectrum and Brillouin spectrum of optical fiber can be successively obtained, and the two spectrum spacing exist
It is NFSR-11.2GHz in scan frequency.
2. Rayleigh-Brillouin light domain reflectometer that a kind of temperature according to claim 1 and stress detect simultaneously, special
Sign is that the optical emitting unit (10) includes 1.5 μm of laser light sources (11), impulse generator (12) and Erbium-doped fiber amplifier
Device (13)；Wherein, 1.5 μm of continuous lasers of 1.5 μm of laser light sources (11) outgoing cut into arteries and veins by impulse generator (12)
It washes off, pulsed light is amplified by erbium-doped fiber amplifier (13) again, to generate the laser pulse for meeting Fibre Optical Sensor requirement；
The impulse generator (12) is electrooptic modulator or acousto-optic modulator.
3. Rayleigh-Brillouin light domain reflectometer that a kind of temperature according to claim 1 and stress detect simultaneously, special
Sign is that the detection object element (20) includes：Optical fiber circulator (21), reference optical fiber (22) and sensor fibre (23)；Its
In, laser pulse is incident from the ports a of optical fiber circulator (21), and reference optical fiber (22) and sensor fibre are respectively enterd from the ports b
(23), b port of the echo-signal through optical fiber circulator (21) returns, and gives filter unit (30) by c port transmissions；
The reference optical fiber (22) and sensor fibre (23) are single mode optical fiber or polarization maintaining optical fibre.
4. Rayleigh-Brillouin light domain reflectometer that a kind of temperature according to claim 1 and stress detect simultaneously, special
Sign is that the filter unit (30) is fiber bragg grating, molecular filter device, Mach Zehnder interferometer or sagnac rings.
5. Rayleigh-Brillouin light domain reflectometer that a kind of temperature according to claim 1 and stress detect simultaneously, special
Sign is that the probe unit (50) is that indium gallium arsenic single-photon detector, upper conversion single-photon detector or superconducting single-photon are visited
Survey device.
6. Rayleigh-Brillouin light domain reflectometer that a kind of temperature according to claim 1 and stress detect simultaneously, special
Sign is that the data acquisition and processing (DAP) unit (60) includes：Capture card (61), computer (62) and arbitrary-function generator
(63)；Wherein, the arbitrary function transmitter (63) is used to trigger the impulse generator in synchronous optical transmitter unit (10)
(12) it is used for through temperature and stress information suffered by preset algorithm inverting optical fiber with capture card (61), the computer (62).
7. Rayleigh-Brillouin light domain reflectometer of a kind of temperature and stress detection simultaneously according to claim 1 or 6,
It is characterized in that, temperature and the refutation process of stress information suffered by the optical fiber include：
Chamber length by scanning F-P interferometers obtains Brillouin spectrum and Rayleigh scattering spectrum, is dissipated to the Rayleigh of unit distance Bin
Penetrate spectrum and Brillouin spectrum rebuild, and to after reconstruction Rayleigh scattering spectrum and Brillouin spectrum be fitted, acquire
The ratio LPR of Rayleigh scattering power and Brillouin scattering power；Rayleigh scattering spectrum peak and Brillouin scattering spectrum peak are calculated again
The spacing of position；
Fiber optic temperature information is calculated by LPR, then passes through Brillouin shift inverting fiber stress information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610346029.4A CN105890797B (en) | 2016-05-19 | 2016-05-19 | EO-1 hyperion Rayleigh-Brillouin light domain reflectometer that temperature and stress detect simultaneously |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610346029.4A CN105890797B (en) | 2016-05-19 | 2016-05-19 | EO-1 hyperion Rayleigh-Brillouin light domain reflectometer that temperature and stress detect simultaneously |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105890797A CN105890797A (en) | 2016-08-24 |
| CN105890797B true CN105890797B (en) | 2018-08-21 |
Family
ID=56716738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610346029.4A Active CN105890797B (en) | 2016-05-19 | 2016-05-19 | EO-1 hyperion Rayleigh-Brillouin light domain reflectometer that temperature and stress detect simultaneously |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105890797B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108204833A (en) * | 2016-12-19 | 2018-06-26 | 上海朗研光电科技有限公司 | A kind of BOTDR measuring methods based on near-infrared single photon detector |
| CN107014529A (en) * | 2017-05-24 | 2017-08-04 | 苏州至禅光纤传感技术有限公司 | Pressure sensor and pressure sensor device based on heterogeneous optical fiber |
| CN107340077B (en) * | 2017-07-11 | 2023-06-02 | 中国地质大学（武汉） | Sensing method and sensing system for full-distributed optical fiber temperature and stress |
| CN107588873B (en) * | 2017-07-20 | 2020-02-07 | 全球能源互联网研究院 | Optical fiber sensing device with electromagnetic environment monitoring function |
| CN110243511B (en) * | 2019-06-28 | 2022-01-04 | 暨南大学 | High-sensitivity optical fiber Fabry-Perot stress sensor and sensing method thereof |
| CN111157115B (en) * | 2019-12-18 | 2022-03-29 | 华中科技大学鄂州工业技术研究院 | Underwater Brillouin scattering spectrum acquisition method and device |
| CN111157116B (en) * | 2019-12-18 | 2022-04-01 | 华中科技大学鄂州工业技术研究院 | Underwater Brillouin scattering spectrum test system |
| CN113375837B (en) * | 2021-06-11 | 2022-05-17 | 中电科思仪科技股份有限公司 | Automatic measurement method and device for temperature coefficient of optical quantum BOTDR optical fiber |
| CN114414499B (en) * | 2022-01-29 | 2023-07-07 | 中国科学院半导体研究所 | Time-resolved brillouin spectroscopic system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101158592A (en) * | 2007-10-15 | 2008-04-09 | 北京航空航天大学 | Optical fiber distributed temperature and stress sensing device |
| CN101158591A (en) * | 2007-10-15 | 2008-04-09 | 北京航空航天大学 | Detecting method suitable for optical fiber distributed temperature and stress sensing device |
| CN101666688A (en) * | 2009-09-14 | 2010-03-10 | 中国人民解放军理工大学 | Method for measuring spontaneous Brillouin scattering based on super structured fiber grating filter |
| CN102445285A (en) * | 2011-09-29 | 2012-05-09 | 国电南京自动化股份有限公司 | Peak searching method of Brillouin optical time domain reflectometer (BOTDR) system |
| CN102607449A (en) * | 2012-03-12 | 2012-07-25 | 南京大学（苏州）高新技术研究院 | Signal processing method for simultaneously improving BOTDR (Brillion optical time domain reflectometer) spatial resolution ratio and frequency shift measuring precision |
| CN102998025A (en) * | 2012-12-18 | 2013-03-27 | 华北电力大学（保定） | Measuring method for pulse pre-pump rayleigh BOTDA (Brilouin optical time domain analysis) temperature and strain |
| CN103674084A (en) * | 2013-12-16 | 2014-03-26 | 华北电力大学（保定） | Method for simultaneously measuring distributed type temperatures and strain |
| CN104677421A (en) * | 2015-02-10 | 2015-06-03 | 中国科学技术大学先进技术研究院 | Optical fiber temperature and strain sensing device and method based on high spectral resolution technology |
-
2016
- 2016-05-19 CN CN201610346029.4A patent/CN105890797B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101158592A (en) * | 2007-10-15 | 2008-04-09 | 北京航空航天大学 | Optical fiber distributed temperature and stress sensing device |
| CN101158591A (en) * | 2007-10-15 | 2008-04-09 | 北京航空航天大学 | Detecting method suitable for optical fiber distributed temperature and stress sensing device |
| CN101666688A (en) * | 2009-09-14 | 2010-03-10 | 中国人民解放军理工大学 | Method for measuring spontaneous Brillouin scattering based on super structured fiber grating filter |
| CN102445285A (en) * | 2011-09-29 | 2012-05-09 | 国电南京自动化股份有限公司 | Peak searching method of Brillouin optical time domain reflectometer (BOTDR) system |
| CN102607449A (en) * | 2012-03-12 | 2012-07-25 | 南京大学（苏州）高新技术研究院 | Signal processing method for simultaneously improving BOTDR (Brillion optical time domain reflectometer) spatial resolution ratio and frequency shift measuring precision |
| CN102998025A (en) * | 2012-12-18 | 2013-03-27 | 华北电力大学（保定） | Measuring method for pulse pre-pump rayleigh BOTDA (Brilouin optical time domain analysis) temperature and strain |
| CN103674084A (en) * | 2013-12-16 | 2014-03-26 | 华北电力大学（保定） | Method for simultaneously measuring distributed type temperatures and strain |
| CN104677421A (en) * | 2015-02-10 | 2015-06-03 | 中国科学技术大学先进技术研究院 | Optical fiber temperature and strain sensing device and method based on high spectral resolution technology |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105890797A (en) | 2016-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105890797B (en) | EO-1 hyperion Rayleigh-Brillouin light domain reflectometer that temperature and stress detect simultaneously | |
| Sun et al. | Distributed fiber-optic vibration sensor using a ring Mach-Zehnder interferometer | |
| Zhu et al. | Improved Φ-OTDR sensing system for high-precision dynamic strain measurement based on ultra-weak fiber Bragg grating array | |
| CN108303197B (en) | Distributed temperature and strain double-parameter sensing device based on backscatter enhanced optical fiber and demodulation method thereof | |
| Zhang et al. | A large capacity sensing network with identical weak fiber Bragg gratings multiplexing | |
| Masoudi et al. | A distributed optical fibre dynamic strain sensor based on phase-OTDR | |
| CN102620857B (en) | Brillouin optical time domain reflectometer for single-photon detection based on edged filter method | |
| CN107917738A (en) | A kind of while measurement temperature, strain and the distributed optical fiber sensing system of vibration | |
| CN102829807B (en) | BOTDA (Brillouin Optical Time Domain Analyzer) and POTDR (Polarization Optical Time Domain Reflectometer) combined distributed type optical fiber sensing system | |
| CN102313568B (en) | The distribution type optical fiber sensing equipment that a kind of Brillouin and Raman detect simultaneously | |
| CN206496768U (en) | A kind of phase sensitive optical time domain reflectometer based on chirp | |
| CN203605976U (en) | Distributed type optical fiber temperature and stress sensing device | |
| CN102798411A (en) | System and method for distributed optical fibre sensing measurement based on Brillouin scattering | |
| CN103727968A (en) | Distributed type optical fiber sensing device and method for simultaneously measuring temperature, strain and vibration | |
| CN102506913A (en) | Interference type optical fiber distribution disturbance sensor and disturbance location method thereof | |
| CN107036734A (en) | A kind of fully distributed fiber temperature or the method for sensing and sensor of strain | |
| CN107238412A (en) | It is a kind of while monitoring vibration, stress, the distributed fiberoptic sensor of temperature | |
| CN110243493A (en) | Brillouin optical time-domain reflectometer device and method based on super continuous spectrums | |
| CN106066203B (en) | The highly sensitive vibration-detection system of distribution and method based on ultrashort optical fiber optical grating array | |
| CN103616091A (en) | Distributed optical fiber temperature and stress sensing device | |
| CN109163829A (en) | The dynamic distributed fibre optical sensor of high-performance based on Brillouin and Rayleigh double-unit system | |
| CN113447110A (en) | Distributed optical fiber vibration sensing system and phase carrier demodulation method thereof | |
| CN102564476A (en) | Multipoint disturbance positioning method | |
| Li et al. | Distributed weak fiber Bragg grating vibration sensing system based on 3× 3 fiber coupler | |
| KR101889351B1 (en) | Spatially-selective brillouin distributed optical fiber sensor with increased effective sensing points and sensing method using brillouin scattering |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |