CN106289407A - A kind of method utilizing fibre core bubble optical fiber simultaneously to measure temperature and magnetic field - Google Patents
A kind of method utilizing fibre core bubble optical fiber simultaneously to measure temperature and magnetic field Download PDFInfo
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- CN106289407A CN106289407A CN201610755869.6A CN201610755869A CN106289407A CN 106289407 A CN106289407 A CN 106289407A CN 201610755869 A CN201610755869 A CN 201610755869A CN 106289407 A CN106289407 A CN 106289407A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2551—Splicing of light guides, e.g. by fusion or bonding using thermal methods, e.g. fusion welding by arc discharge, laser beam, plasma torch
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Abstract
The invention provides a kind of method utilizing fibre core bubble optical fiber simultaneously to measure temperature and magnetic field, described method comprises the steps: a) to carry out cutting process at two sections of fiber core end faces；B) by two sections of optical fiber in step a) with the mutual welding of end face of cutting, the both ends of the surface cutting of welding is the most corresponding, and in described fusion process, cutting expands, and fibre core position produces bubble, obtains fibre core bubble optical fiber；C) by described fibre core bubble optical fiber and fiber grating welding, carry out temperature calibration and magnetic field is demarcated；D) gathering the wavelength shift of fibre core bubble optical fiber and fiber grating, the wavelength shift of matching fibre core bubble optical fiber and fiber grating is with temperature and the relation curve of changes of magnetic field amount；Temperature in environment to be measured and magnetic field are measured by the relation curve e) utilizing step d) simultaneously.
Description
Technical field
The present invention relates to technical field of sensor measurement, utilize fibre core bubble optical fiber to measure temperature particularly to one simultaneously
Method with magnetic field.
Background technology
The sensor of all-fiber has the advantages such as compact conformation, length in service life, sensitive to test volume, transmission channel is many
It is widely used in the fields such as Fibre Optical Sensor, fiber optic communication, optical manufacturing.Had by fiber end face micro-processing technology or build
The full-fiber sensor of interference structure, under pumping source effect, output has the interference spectrum curve of comb spectrum pattern.Thin-core fibers
Mach-Zehnder optical fiber sensor construction is simple and is easily achieved, and this structure is relative at two sections of core diameters by one section of thin-core fibers welding
In thicker rare earth doped optical fibre, rare earth doped optical fibre is also used as the gain media of sensor.In prior art, based on double
The Mach-Zehnder interferometer of core fibre, is applied to the measurement of temperature and strain, and interference fringe lining amplitude ratio is about 10dBm, between striped
Every about 2nm.Optical fiber mach-Zehnder interferometer has the advantages such as simple in construction, fringe contrast is high, comb spectrum is intensive, often quilt
For sensory field of optic fibre.
Fibre core bubble optical fiber forms bubble in fibre core in making in fibre core, and bubble enables to fibre core effective refractive index and sends out
Changing, in fibre core transmission light change through bubble, light path, produce intermode interference, due at an optical fiber with regard to energy
Realize the interference between various modes, simplify light path, make structure compacter, and be lost low, not by external interference, have
Well development prospect.But, in the prior art, bubble optical fiber is applied to single temperature or the survey in magnetic field
Amount.
For defect of the prior art, inventor finds that bubble optical fiber is to temperature and the sensitivity in magnetic field and fiber grating
Temperature and magnetic field are respectively provided with different sensitivity, it is possible to achieve measure while temperature and magnetic field.
Therefore, a kind of one that can effectively temperature and magnetic field be measured simultaneously to utilize fibre core bubble optical fiber simultaneously
Measure temperature and the method in magnetic field.
Summary of the invention
The present invention provides a kind of method utilizing fibre core bubble optical fiber simultaneously to measure temperature and magnetic field, institute in one aspect
The method of stating comprises the steps:
A) cutting process is carried out at two sections of fiber core end faces；
B) by two sections of optical fiber in step a) with the mutual welding of end face of cutting, the both ends of the surface cutting of welding is the most corresponding,
In described fusion process, cutting expands, and fibre core position produces bubble, obtains fibre core bubble optical fiber；
C) by described fibre core bubble optical fiber and fiber grating welding, carry out temperature calibration and magnetic field is demarcated；
D) wavelength shift of fibre core bubble optical fiber and fiber grating, matching fibre core bubble optical fiber and fiber grating are gathered
Wavelength shift is with temperature and the relation curve of changes of magnetic field amount；
Temperature in environment to be measured and magnetic field are measured by the relation curve e) utilizing step d) simultaneously.
Preferably, described scaling method comprises the steps:
(1) the fibre core bubble optical fiber after welding and fiber grating are placed in controllable temperature change and the environment of changes of magnetic field
In；
(2) using the trough of fibre core bubble optical fiber and fiber grating as sampled point, the size of temperature in Gradual scene change,
Change the size in magnetic field in environment, the length that record comb spectrum moves simultaneously.
Preferably, described fibre core bubble optical fiber and the wavelength shift of fiber grating are with temperature and the relation of changes of magnetic field amount
Curve meets following relation:
Wherein Δ λ1、Δλ2It is respectively fibre core bubble optical fiber and optical fiber light
The wavelength shift of grid；Δ T, Δ h are respectively the variable quantity in temperature and magnetic field；KT1、KT2It is respectively fibre core bubble optical fiber and optical fiber
The temperature control of grating；Kh1、Kh2It is respectively fibre core bubble optical fiber and the magnetic field sensitivity of fiber grating；D=KT1Kh2-
KT2Kh1。
Preferably, described temperature control and described magnetic field sensitivity are obtained by meter sensitivity slope of a curve.
Another aspect of the present invention provides a kind of measurement system for measuring temperature and methods of magnetic field simultaneously, described
Measurement system is sequentially connected with pump light source, wavelength division multiplexer, gain fibre, the first single-mode fiber, fibre core bubble optical fiber, optical fiber light
Grid, the second single-mode fiber and spectrogrph；
Described fibre core bubble optical fiber by two sections of end faces with the fused fiber splice of cutting；Described fibre core bubble optical fiber and described light
Fine grating is welded together for measuring temperature and magnetic field simultaneously.
Preferably, described gain fibre is the optical fiber of one section of doped with rare-earth elements.
Fibre core bubble optical fiber and fiber grating are welded together by the present invention, owing to fiber grating and fibre core bubble optical fiber have
There are different temperature and magnetic field sensing sensitivity, it is achieved that temperature and magnetic field are measured simultaneously.
Should be appreciated that aforementioned description substantially is exemplary illustration and explanation with follow-up detailed description, should not
It is used as the restriction of content claimed to the present invention.
Accompanying drawing explanation
With reference to the accompanying drawing enclosed, as follows by by embodiment of the present invention of the more purpose of the present invention, function and advantage
Description is illustrated, wherein:
Fig. 1 diagrammatically illustrates the present invention and utilizes fibre core bubble optical fiber to measure the flow chart in temperature and magnetic field simultaneously；
Fig. 2 shows the schematic diagram of fibre core bubble fused fiber splice of the present invention；
Fig. 3 shows that in one embodiment of the invention, temperature and magnetic field are demarcated by fibre core bubble optical fiber with fiber grating welding
Schematic diagram；
Fig. 4 shows the wave length shift schematic diagram of fibre core bubble optical fiber of the present invention；
Fig. 5 shows the wave length shift schematic diagram of the present invention and fiber grating；
Fig. 6 shows that in another embodiment of the present invention, temperature and magnetic field are marked by fibre core bubble optical fiber with fiber grating welding
Fixed schematic diagram.
Detailed description of the invention
By with reference to one exemplary embodiment, the purpose of the present invention and function and for realizing the side of these purposes and function
Method will be illustrated.But, the present invention is not limited to one exemplary embodiment disclosed below；Can be come by multi-form
It is realized.The essence of description is only the detail helping the various equivalent modifications Integrated Understanding present invention.
Hereinafter, embodiments of the invention will be described with reference to the drawings.In the accompanying drawings, identical reference represents identical
Or similar parts, or same or similar step.In embodiments below, the one to the present invention utilizes fibre core bubble light
During the fine method simultaneously measuring temperature and magnetic field elaborates, some relevant technical terms should be this area skill
Art personnel it will be appreciated that.
Embodiment one
In order to present disclosure is clearly described, gives the present invention in the following example and utilize fibre core bubble optical fiber
Measure temperature and the idiographic flow in magnetic field simultaneously.The present invention utilizes fibre core bubble optical fiber to measure temperature and magnetic simultaneously as shown in Figure 1
The flow chart of field, specifically, utilizes the method that fibre core bubble optical fiber measures temperature and magnetic field simultaneously, and described method includes walking as follows
Rapid:
Step S101: welding fibre core bubble optical fiber, carries out cutting process at two sections of fiber end faces；Described two sections through and quarter
The optical fiber of groove is with the mutual welding of end face of cutting, and the both ends of the surface cutting of welding is the most corresponding, and in described fusion process, cutting is sent out
Raw expansion, fibre core position produces bubble, obtains fibre core bubble optical fiber；
Step S102: temperature and magnetic field are demarcated, by described fibre core bubble optical fiber and fiber grating welding, carries out temperature calibration
Demarcate with magnetic field；
Step S103: matched curve, gathers the wavelength shift of fibre core bubble optical fiber and fiber grating, matching fibre core bubble
The wavelength shift of optical fiber and fiber grating is with temperature and the relation curve of changes of magnetic field amount；
Step S104: temperature and magnetic field are measured simultaneously, utilizes the relation curve of step S103 to the temperature in environment to be measured
Measure with magnetic field simultaneously.
The welding of fibre core bubble optical fiber
Signal Figure 100 of fibre core bubble fused fiber splice the most of the present invention, first chooses two sections of optical fiber, described optical fiber
Including covering 101 and fibre core 102, an end face at two sections of optical fiber carries out cutting process respectively, by described two sections of optical fiber with
The mutual welding of end face of cutting, the both ends of the surface cutting of welding is the most corresponding, and in described fusion process, cutting expands, fibre core position
Anger of buying property bubble 103, obtains fibre core bubble optical fiber；Light path in fibre core 102 communication process of fibre core bubble optical fiber through fibre core
Bubble optical fiber bubble 103 at realize interfere.Preferably, manually regulation heat sealing machine parameter is selected, by two sections of optical fiber with quarter
The end face correspondence alignment of groove, completes the welding of two sections of optical fiber by electric discharge welding.In the present embodiment, preferably mutually two sections of welding
Section fiber lengths is consistent.
Temperature and the demarcation in magnetic field
The band alveolate fibre core bubble optical fiber that welding is good is carried out welding with fiber grating.The present invention one as shown in Figure 3
Signal Figure 200 that in individual embodiment, temperature and magnetic field are demarcated by fibre core bubble optical fiber with fiber grating welding, builds measurement system,
Described measurement is sequentially connected with pump light source 201, wavelength division multiplexer 202, gain fibre the 203, first single mode by optical fiber 204 system
Optical fiber 205, fibre core bubble optical fiber 206, fiber grating the 208, second single-mode optics 209 fibre, spectrogrph 210 and temperature controller 207.
Fibre core bubble optical fiber 206 and fiber grating 208 are placed in the environment that can control temperature and changes of magnetic field.In some embodiments
In, the optical fiber of the preferred doped with rare-earth elements of gain fibre 203.
Described fibre core bubble optical fiber 206 and described fiber grating 208 are welded together and are placed in temperature and be can in magnetic field
Demarcating the variable quantity of temperature with the variable quantity in magnetic field 211 in the environment of control, in the present embodiment, magnetic field is uniform magnetic field.
Specifically, the step of calibration process is as follows:
Step 1: the fibre core bubble optical fiber 206 after welding and fiber grating 208 are placed in controllable temperature change and magnetic field becomes
In the environment changed；
Step 2: using the trough of fibre core bubble optical fiber 206 and fiber grating 208 as sampled point, the middle temperature of Gradual scene change
The size of degree, changes the size in magnetic field 211 in environment, the length that record comb spectrum moves simultaneously.
In above-mentioned calibration process, the temperature of environment is gradually increased by the temperature in environment by temperature controller 207, with
Time gradually strengthen the intensity in magnetic field 211 in environment.It should be appreciated that for the change of environment in calibration process can select by
Gradually reduce the size of temperature in the temperature level in environment and the intensity in magnetic field, increase environment and reduce the intensity in magnetic field, fall simultaneously
In low environment, the size of temperature increases one or more of the intensity various ways in magnetic field simultaneously.
In the present invention, owing to fibre core bubble optical fiber and fiber grating have different temperature and magnetic field sensing sensitivity,
Fibre core bubble optical fiber and fiber grating produce different wavelength shifts in the case of temperature and magnetic field change.
In the present embodiment, by collecting fibre core bubble optical fiber and fiber grating in the case of temperature and magnetic field are changed
Wavelength shift, and then matching is for the curve measuring temperature and magnetic field changes simultaneously.The present embodiment hereinafter, illustrates
The method of curve matching.
The matching of curve
In the present embodiment said process, the change to temperature and magnetic field carries out record, obtains variation delta T of temperature；
Variation delta h in magnetic field.The wave length shift schematic diagram of fibre core bubble optical fiber the most of the present invention, light the most of the present invention
The wave length shift schematic diagram of fine grating, the length that the comb spectrum of acquisition and recording moves, obtain the wave length shift of fibre core bubble optical fiber
Amount Δ λ1；The wavelength shift Δ λ of fiber grating2。
Meter sensitivity slope of a curve, obtains fibre core bubble optical fiber and temperature control K of fiber gratingT1、KT2；Fine
Core bubble optical fiber and the magnetic field sensitivity K of fiber gratingh1、Kh2.Fibre core bubble optical fiber and fiber grating is obtained through matrix calculus
Wavelength shift meet following relation:
Above-mentioned formula (1) obtains relation carry out matrix transpose and be calculated:
Wherein, wherein Δ λ1、Δλ2It is respectively fibre core bubble optical fiber and the wavelength shift of fiber grating；Δ T, Δ n are respectively
For temperature and the variable quantity in magnetic field；KT1、KT2It is respectively fibre core bubble optical fiber and the temperature control of fiber grating；Kh1、Kh2Respectively
For fibre core bubble optical fiber and the magnetic field sensitivity of fiber grating；D=KT1Kh2-KT2Kh1。
Measure while temperature and magnetic field
Measure while the environment that the present embodiment all changes with temperature and magnetic field illustrates the temperature of the present invention and magnetic field.Will
In the environment that the fibre core bubble optical fiber of described measurement system and fiber grating are placed in temperature and magnetic field changes, with fibre core bubble simultaneously
The trough of optical fiber and fiber grating, as sampled point, records the length that the comb spectrum of fibre core bubble optical fiber and fiber grating moves,
Thus obtain the wavelength shift of fibre core bubble optical fiber and fiber grating.Here with fibre core bubble fiber optic wavelength drift value Δ λ1For
Example, fiber grating sensor wavelength drift value Δ λ2As a example by.
By formulaDirectly read the variable quantity in temperature and magnetic field, thus realize
Measure while temperature and magnetic field.
Fibre core bubble optical fiber and fiber grating are welded together by the present invention, owing to fiber grating and shearing interferometry structure have
There are different temperature and magnetic field sensing sensitivity, it is achieved temperature and magnetic field are measured simultaneously.
Embodiment two
The present embodiment with previous embodiment difference is, in the present embodiment, magnetic field is non-uniform magnetic-field change.The most right
The calibration process of temperature and non-uniform magnetic-field change is described in detail, identical, here with embodiment one for other steps
Do not state tired.
As in Fig. 6 another embodiment of the present invention, temperature and magnetic field are demarcated by fibre core bubble optical fiber with fiber grating welding
Schematic diagram 300, carries out welding by band alveolate fibre core bubble optical fiber and the fiber grating that welding is good.Build measurement system, institute
State measurement and be sequentially connected with pump light source 301, wavelength division multiplexer 302, gain fibre the 303, first single-mode optics by optical fiber 304 system
Fibre 305, fibre core bubble optical fiber 306, fiber grating the 308, second single-mode optics 309 fibre, spectrogrph 310 and temperature controller 307.Fine
Core bubble optical fiber 306 and fiber grating 308 are placed in the environment that can control temperature and changes of magnetic field.In certain embodiments,
The optical fiber of the preferred doped with rare-earth elements of gain fibre 303.
Described fibre core bubble optical fiber 306 and described fiber grating 308 are welded together and are placed in temperature and be can in magnetic field
The variable quantity of temperature is demarcated by the environment of control with the variable quantity of magnetic field B.Specifically, the step of calibration process is as follows:
Step 1: the fibre core bubble optical fiber 306 after welding and fiber grating 308 are placed in controllable temperature change and magnetic field and
In the environment of change；
Step 2: using the trough of fibre core bubble optical fiber 306 and fiber grating 308 as sampled point, the middle temperature of Gradual scene change
The size of degree, changes the size of magnetic field B in environment, the length that record comb spectrum moves simultaneously.
In above-mentioned calibration process, the temperature of environment is gradually increased by the temperature in environment by temperature controller 307, with
Time gradually strengthen the intensity of magnetic field B in environment.It should be appreciated that can select gradually for the change of environment in calibration process
Reduce the size of temperature in the temperature level in environment and the intensity in magnetic field, increase environment and reduce the intensity in magnetic field, reduction simultaneously
In environment, the size of temperature increases one or more of the intensity various ways in magnetic field simultaneously.
In the present invention, owing to fibre core bubble optical fiber and fiber grating have different temperature and magnetic field sensing sensitivity,
Fibre core bubble optical fiber and fiber grating produce different wavelength shifts in the case of temperature and magnetic field change, it is achieved simultaneously
Temperature and material strain are measured.
In conjunction with explanation and the practice of the present invention disclosed here, other embodiments of the present invention are for those skilled in the art
All it is easy to expect and understand.Illustrating and embodiment is to be considered only as exemplary, true scope and the purport of the present invention are equal
It is defined in the claims.
Claims (6)
1. one kind utilizes the method that fibre core bubble optical fiber measures temperature and magnetic field simultaneously, it is characterised in that described method include as
Lower step:
A) cutting process is carried out at two sections of fiber core end faces；
B) by two sections of optical fiber in step a) with the mutual welding of end face of cutting, the both ends of the surface cutting of welding is the most corresponding, described
In fusion process, cutting expands, and fibre core position produces bubble, obtains fibre core bubble optical fiber；
C) by described fibre core bubble optical fiber and fiber grating welding, carry out temperature calibration and magnetic field is demarcated；
D) wavelength shift of fibre core bubble optical fiber and fiber grating, matching fibre core bubble optical fiber and the wavelength of fiber grating are gathered
Drift value is with temperature and the relation curve of changes of magnetic field amount；
Temperature in environment to be measured and magnetic field are measured by the relation curve e) utilizing step d) simultaneously.
Measurement temperature and the method in magnetic field simultaneously the most according to claim 1, it is characterised in that described scaling method includes
Following steps:
(1) the fibre core bubble optical fiber after welding and fiber grating are placed in the environment of controllable temperature change and changes of magnetic field；
(2) using the trough of fibre core bubble optical fiber and fiber grating as sampled point, the size of temperature in Gradual scene change, simultaneously
Change the size in magnetic field in environment, the length that record comb spectrum moves.
Measurement temperature and the method in magnetic field simultaneously the most according to claim 1, it is characterised in that described fibre core bubble optical fiber
Following relation is met with the relation curve of temperature and changes of magnetic field amount with the wavelength shift of fiber grating:
Wherein Δ λ1、Δλ2It is respectively fibre core bubble optical fiber and the ripple of fiber grating
Long drift value；Δ T, Δ h are respectively the variable quantity in temperature and magnetic field；KT1、KT2It is respectively fibre core bubble optical fiber and fiber grating
Temperature control；Kh1、Kh2It is respectively fibre core bubble optical fiber and the magnetic field sensitivity of fiber grating；D=KT1Kh2-KT2Kh1。
The most according to claim 3 measure temperature and the method in magnetic field simultaneously, it is characterised in that described temperature control and
Described magnetic field sensitivity is obtained by meter sensitivity slope of a curve.
5. the measurement system for method described in claim 1-4 any claim, it is characterised in that described measurement system
System be sequentially connected with pump light source, wavelength division multiplexer, gain fibre, the first single-mode fiber, fibre core bubble optical fiber, fiber grating, the
Two single-mode fibers and spectrogrph；
Described fibre core bubble optical fiber by two sections of end faces with the fused fiber splice of cutting；Described fibre core bubble optical fiber and described optical fiber light
Grid are welded together for measuring temperature and magnetic field simultaneously.
Measurement system the most according to claim 5, it is characterised in that described gain fibre is one section of doped with rare-earth elements
Optical fiber.
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Cited By (1)
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| CN107449471A (en) * | 2017-09-29 | 2017-12-08 | 中国计量大学 | A kind of magnetic field and temperature simultaneously measuring device based on highly doped germanium fibre-optical probe |
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