CN108106752A - Fiber F-P temperature and the two-parameter sensing device of strain based on Sagnac rings - Google Patents
Fiber F-P temperature and the two-parameter sensing device of strain based on Sagnac rings Download PDFInfo
- Publication number
- CN108106752A CN108106752A CN201711400298.5A CN201711400298A CN108106752A CN 108106752 A CN108106752 A CN 108106752A CN 201711400298 A CN201711400298 A CN 201711400298A CN 108106752 A CN108106752 A CN 108106752A
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- Prior art keywords
- fiber
- optical fiber
- temperature
- sagnac rings
- variation
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/161—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means
Abstract
The present invention provides a kind of optical fiber F P temperature based on Sagnac rings and two-parameter sensing device is strained, including：Wideband light source, optical fiber circulator, optical fiber F P-structure, Sagnac rings and fiber spectrometer；The output terminal of the wideband light source and the input port of optical fiber circulator connect, first output port of optical fiber circulator is connected with one end of optical fiber F P-structure, the second output terminal mouth of optical fiber circulator is connected with fiber spectrometer, and Sagnac rings are connected with the other end of optical fiber F P-structure；Apparatus of the present invention, using optical fiber F P-structure and polarization-maintaining Sagnac rings to temperature and the different individual features of strain, are realized to temperature and measured while straining two-parameter by connecing a Sagnac ring behind optical fiber F P.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, more particularly to a kind of fiber F-P temperature based on Sagnac rings and should
Become two-parameter sensing device.
Background technology
Optical fiber has the features such as light and handy, sensitive, anti-strong electromagnetic, anticorrosive, high temperature resistant, small signal attenuation, now
Through being widely used in sensory field by people.Optical fiber, can be with networking for sensing, it is easy to accomplish it is intelligent, the transmission of collection information with
It senses in one, can effectively solve the problems, such as that conventional detection technology is difficult to the measurement being competent at completely.
Temperature and strain are all to characterize substance physics and the important parameter of chemical property, and temperature and strain measurement fly in large size
The key areas such as the quality monitoring of row device, biologic medical, petroleum detection, bridge construction, which have, to be extremely widely applied, extensively
Ground is applied to the every field of national economy；But there is various variables, single interference formula light in complicated actual environment
Fiber sensor is all sensitive to pressure and two kinds of physical parameters of temperature, measures pressure or the problem of when temperature is present with cross sensitivity,
It is measured while pressure difficult to realize and temperature.Two-parameter real-time measurement is particularly important for real actual environment.
Therefore, it is necessary to it is a kind of can realize to pressure and temperature two-parameter and meanwhile measure in real time based on Sagnac rings
Fiber F-P temperature and the two-parameter sensing device of strain.
The content of the invention
In order to solve the above technical problem, the present invention provides a kind of fiber F-P temperature based on Sagnac rings and strain are double
Parameter sensing device, including：Wideband light source, optical fiber circulator, fiber F-P structure, Sagnac rings and fiber spectrometer；
The output terminal of the wideband light source and the input port of optical fiber circulator connect, the first output terminal of optical fiber circulator
Mouthful be connected with one end of fiber F-P structure, the second output terminal mouth of optical fiber circulator is connected with fiber spectrometer, Sagnac rings and
The other end of fiber F-P structure is connected；
Preferably, the Sagnac rings further include coupler and one section of polarization maintaining optical fibre, and the fiber F-P structure is with coupling
The input terminal connection of device, two ports of output terminal of coupler connect the both ends of polarization maintaining optical fibre respectively.
Apparatus of the present invention utilize fiber F-P structure and polarization-maintaining Sagnac by connecing a Sagnac ring behind fiber F-P
Ring to temperature and the different individual features of strain, realize to temperature and measured while straining two-parameter.Idiographic flow is as follows：
The flashlight that the wideband light source is sent is entered by circulator in fiber F-P structure, the fiber F-P structure
The flashlight is modulated, generates interference wave.
Wherein, the variation of fiber F-P resonance wavelength is with the linear relation of temperature and strain variation：
Δλ1=K1, T*ΔT+K1, ε*Δε (1)
K1, TRepresent the variation coefficient that the resonance wavelength of fiber F-P varies with temperature, K1, εRepresent the resonance wavelength of fiber F-P
With the variation coefficient of strain variation, Δ λ1Represent the drift value of resonance wavelength, Δ T and Δ ε represent that temperature changes with what is strained respectively
Variable.
The light come out from fiber F-P structure passes through the optical path difference that polarization maintaining optical fibre Sagnac rings generate, and can interfere.Its
In, interfere the interference peaks of generation can generate drift with the variation of temperature and strain：
Δλ2=K2, TΔT+K2, εΔε (2)
K2, TRepresent the interference peaks drift value variation with temperature coefficient of Sagnac rings, K2, εRepresent the interference of Sagnac rings
Peak drift value is with the variation coefficient of strain variation, Δ λ2Represent the interference peaks drift value of Sagnac rings.The second of optical fiber circulator
Output port is connected with fiber spectrometer, measures the drift value Δ λ of fiber F-P interference wavelength1Interference peaks are generated with Sagnac rings
Drift value Δ λ2, it is possible to each coefficient is obtained by formula (1) and (2).
The present invention also provides a kind of preparation method of fiber F-P structure, the fiber F-P structure is to be corroded using hydrofluoric acid
Method is prepared, and comprises the following steps：
Step 1：Using single mode optical fiber, the coat of fiber end face is removed, and fiber end face is cut flat with, is fixed on optical fiber
On fixture；
Step 2：The fiber end face cut flat with is stretched into 40% hydrofluoric acid solution, obtains groove,
Step 3：Optical fiber after corrosion treatment is placed in distilled water and is impregnated, then is put into supersonic cleaning machine and cleans, is removed
Remove remaining hydrofluoric acid in fiber end face etching tank；
Step 4：The single mode optical fiber that above-mentioned fiber grooves are cut flat with another butt face is melted using optical fiber splicer
It connects, forms F-P structures, and then obtain full single mode optical fiber F-P sensors.
Compared with the prior art, the invention has the advantages that：
1st, using the design feature that Sagnac rings are connect behind fiber F-P, reflection-type detection is realized.
2nd, there is different receptance functions to temperature and strain using fiber F-P and polarization maintaining optical fibre Sagnac rings, solve temperature
Between degree and refractive index the problem of crosstalk, realize while measure temperature and strain.
3rd, measurement is simple, convenient, fast, sensitivity is high, and practicability is high；It is applicable to aviation, medical treatment, biology, chemistry etc.
The long-range measurement in field.
It should be appreciated that foregoing description substantially and follow-up description in detail are exemplary illustration and explanation, it should not
As the limitation to the claimed content of the present invention.
Description of the drawings
With reference to the attached drawing of accompanying, the more purposes of the present invention, function and advantage will pass through the as follows of embodiment of the present invention
Description is illustrated, wherein：
Fig. 1 shows the fiber F-P temperature and the structure of the two-parameter sensing device of strain based on Sagnac rings of the present invention
Schematic diagram.
Fig. 2 shows that the fiber F-P temperature based on Sagnac rings of the present invention may go out with two-parameter sensing device is strained
Existing reflection spectrogram.
Fig. 3 shows the temperature characteristics of Sagnac rings in sensing device of the invention.
Fig. 4 shows the emergent property curve of fiber F-P structure in sensing device of the invention.
Fig. 5 shows the emergent property curve of Sagnac rings in sensing device of the invention.
Specific embodiment
By reference to exemplary embodiment, the purpose of the present invention and function and the side for being used to implement these purposes and function
Method will be illustrated.However, the present invention is not limited to exemplary embodiment as disclosed below；Can by various form come
It is realized.The essence of specification is only to aid in the detail of the various equivalent modifications Integrated Understanding present invention.
Hereinafter, the embodiment of the present invention will be described with reference to the drawings.In the accompanying drawings, identical reference numeral represents identical
Or similar component or same or like step.
Referring to Fig. 1, the present invention provides a kind of fiber F-P temperature based on Sagnac rings and strains two-parameter sensing device,
Including：Wideband light source, optical fiber circulator, fiber F-P structure, Sagnac rings and fiber spectrometer；The output of the wideband light source
End is connected with the input port of optical fiber circulator, and the first output port of optical fiber circulator is connected with one end of fiber F-P structure,
The second output terminal mouth of optical fiber circulator is connected with fiber spectrometer, and Sagnac rings are connected with the other end of fiber F-P structure, such as
Shown in Fig. 1.
Specifically, the Sagnac rings further include coupler and one section of polarization maintaining optical fibre, and the fiber F-P structure is with coupling
The input terminal connection of device, two ports of output terminal of coupler connect the both ends of polarization maintaining optical fibre respectively.Apparatus of the present invention by
A Sagnac ring is connect behind fiber F-P, using fiber F-P structure and polarization-maintaining Sagnac rings to temperature and the different phases of strain
Characteristic is answered, realize to temperature and is measured while straining two-parameter.
Further, the flashlight that the wideband light source is sent is entered by circulator in fiber F-P structure, described
Fiber F-P structure is modulated the flashlight, generates interference wave.
Wherein, the variation of fiber F-P resonance wavelength is with the linear relation of temperature and strain variation：
Δλ1=K1, T*ΔT+K1, ε*Δε (1)
K1, TRepresent the variation coefficient that the resonance wavelength of fiber F-P varies with temperature, K1,ε represents the resonance wavelength of fiber F-P
With the variation coefficient of strain variation, Δ λ1Represent the drift value of resonance wavelength, Δ T and Δ ε represent that temperature changes with what is strained respectively
Variable.
The light come out from fiber F-P structure passes through the optical path difference that polarization maintaining optical fibre Sagnac rings generate, and can interfere.Its
In, interfere the interference peaks of generation can generate drift with the variation of temperature and strain：
Δλ2=K2, TΔT+K2, εΔε (2)
K2, TRepresent the interference peaks drift value variation with temperature coefficient of Sagnac rings, K2, εRepresent the interference of Sagnac rings
Peak drift value is with the variation coefficient of strain variation, Δ λ2Represent the interference peaks drift value of Sagnac rings.The second of optical fiber circulator
Output port is connected with fiber spectrometer, measures the drift value Δ λ of fiber F-P interference wavelength1Interference peaks are generated with Sagnac rings
Drift value Δ λ2, it is possible to each coefficient is obtained by formula (1) and (2).
Referring to Fig. 2, since authenticated individual fiber F-P structure is to temperature-insensitive, K1, T=0, therefore pass through fitted figure
Point obtains F-P spectrograms in the middle part of 2 each small peak, and by measuring relation of its trough with strain variation, K is obtained1ε, according to thin
Peak measurement obtains K2, T, K2.ε。
The present invention also provides a kind of preparation method of fiber F-P structure, the fiber F-P structure is to be corroded using hydrofluoric acid
Method is prepared, and comprises the following steps：
Step 1：Using single mode optical fiber, the coat of fiber end face is removed, and fiber end face is cut flat with, is fixed on optical fiber
On fixture；
Step 2：The fiber end face cut flat with is stretched into 40% hydrofluoric acid solution, obtains groove,
Step 3：Optical fiber after corrosion treatment is placed in distilled water and is impregnated, then is put into supersonic cleaning machine and cleans, is removed
Remove remaining hydrofluoric acid in fiber end face etching tank；
Step 4：The single mode optical fiber that above-mentioned fiber grooves are cut flat with another butt face is melted using optical fiber splicer
It connects, forms F-P structures, and then obtain full single mode optical fiber F-P sensors.
The present invention realizes reflection-type detection using the design feature that Sagnac rings are connect behind fiber F-P；Utilize optical fiber F-
P and polarization maintaining optical fibre Sagnac rings have different receptance functions to temperature and strain, solve crosstalk between temperature and refractive index
Problem realizes while measures temperature and strain.Present invention measurement is simple, convenient, fast, sensitivity is high, and practicability is high；It can fit
For the long-range measurement in the fields such as aviation, medical treatment, biology, chemistry.
Explanation and practice with reference to the present invention disclosed here, the other embodiment of the present invention is for those skilled in the art
It all will be readily apparent and understand.Illustrate and embodiment is regarded only as being exemplary, true scope of the invention and purport are equal
It is defined in the claims.
Claims (4)
1. a kind of fiber F-P temperature based on Sagnac rings and the two-parameter sensing device of strain, which is characterized in that including：Broadband
Light source, optical fiber circulator, fiber F-P structure, Sagnac rings and fiber spectrometer；
The input port of the output terminal of the wideband light source and optical fiber circulator connects, the first output port of optical fiber circulator with
One end connection of fiber F-P structure, the second output terminal mouth of optical fiber circulator are connected with fiber spectrometer, Sagnac rings and optical fiber
The other end of F-P structures is connected.
2. two-parameter sensing device according to claim 1, which is characterized in that the Sagnac rings further include coupler and
The input terminal connection of one section of polarization maintaining optical fibre, the fiber F-P structure and coupler, two ports of output terminal of coupler connect respectively
Connect the both ends of polarization maintaining optical fibre.
3. two-parameter sensing device according to claim 1, which is characterized in that utilize fiber F-P structure and polarization-maintaining
Sagnac rings to temperature and the different individual features of strain, realize to temperature and measured while straining two-parameter, idiographic flow
It is as follows：
The flashlight that the wideband light source is sent is entered by circulator in fiber F-P structure, and the fiber F-P structure is to institute
It states flashlight to be modulated, generates interference wave；
Wherein, the variation of fiber F-P resonance wavelength is with the linear relation of temperature and strain variation：
Δλ1=K1, T*ΔT+K1, ε*Δε (1)
K1, TRepresent the variation coefficient that the resonance wavelength of fiber F-P varies with temperature, K1, εRepresent fiber F-P resonance wavelength with should
The variation coefficient of variation, Δ λ1Represent the drift value of resonance wavelength, Δ T and Δ ε represent the knots modification of temperature and strain respectively；
The light come out from fiber F-P structure passes through the optical path difference that polarization maintaining optical fibre Sagnac rings generate, and can interfere；Wherein, do
Drift can be generated with the variation of temperature and strain by relating to the interference peaks of generation：
Δλ2=K2, TΔT+K2, εΔε(2)
K2, TRepresent the interference peaks drift value variation with temperature coefficient of Sagnac rings, K2, εRepresent the interference peaks drift of Sagnac rings
Amount is with the variation coefficient of strain variation, Δ λ2Represent the interference peaks drift value of Sagnac rings；The second output terminal of optical fiber circulator
Mouth is connected with fiber spectrometer, measures the drift value Δ λ of fiber F-P interference wavelength1The drift of interference peaks is generated with Sagnac rings
Measure Δ λ2, you can each coefficient is obtained by formula (1) and (2).
4. a kind of preparation method of fiber F-P structure, the fiber F-P structure is wrapped to be prepared using hydrofluoric acid etch
Include following steps：
Step 1：Using single mode optical fiber, the coat of fiber end face is removed, and fiber end face is cut flat with, is fixed on fiber clamp
On；
Step 2：The fiber end face cut flat with is stretched into 40% hydrofluoric acid solution, obtains groove；
Step 3：Optical fiber after corrosion treatment is placed in distilled water and is impregnated, then is put into supersonic cleaning machine and cleans, except delustering
Remaining hydrofluoric acid in fine end face etching tank；
Step 4：The single mode optical fiber for being cut flat with above-mentioned fiber grooves and another butt face using optical fiber splicer carries out welding, shape
Into F-P structures, and then obtain full single mode optical fiber F-P sensors.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711400298.5A CN108106752A (en) | 2017-12-22 | 2017-12-22 | Fiber F-P temperature and the two-parameter sensing device of strain based on Sagnac rings |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711400298.5A CN108106752A (en) | 2017-12-22 | 2017-12-22 | Fiber F-P temperature and the two-parameter sensing device of strain based on Sagnac rings |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110243511A (en) * | 2019-06-28 | 2019-09-17 | 暨南大学 | A kind of high sensitivity optical fiber Fabry Perot strain gauge and its method for sensing |
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2017
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| US5724371A (en) * | 1995-02-21 | 1998-03-03 | Commissariat A L'energie Atomique | Photoinscribed bragg grating sensor with a good signal-to-noise ratio |
| CN101017116A (en) * | 2006-10-09 | 2007-08-15 | 南京师范大学 | Fabry-Perotw fiber-optic pressure sensor and manufacture method therefor |
| CN203657934U (en) * | 2014-01-17 | 2014-06-18 | 中国计量学院 | Reflection-type temperature/refractive index two-parameter sensing device employing long-period FBG based on Sagnac ring |
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| CN110243511A (en) * | 2019-06-28 | 2019-09-17 | 暨南大学 | A kind of high sensitivity optical fiber Fabry Perot strain gauge and its method for sensing |
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