CN106352807A - Method for measuring strain of material on basis of thin-core fiber Mach-Zehnder interferometer - Google Patents
Method for measuring strain of material on basis of thin-core fiber Mach-Zehnder interferometer Download PDFInfo
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- CN106352807A CN106352807A CN201610847994.XA CN201610847994A CN106352807A CN 106352807 A CN106352807 A CN 106352807A CN 201610847994 A CN201610847994 A CN 201610847994A CN 106352807 A CN106352807 A CN 106352807A
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- Prior art keywords
- thin
- rare earth
- earth doped
- optical fibre
- core fibers
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Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B9/00—Measuring instruments characterised by the use of optical techniques
- G01B9/02—Interferometers
- G01B9/02001—Interferometers characterised by controlling or generating intrinsic radiation properties
- G01B9/02007—Two or more frequencies or sources used for interferometric measurement
- G01B9/02008—Two or more frequencies or sources used for interferometric measurement by using a frequency comb
Abstract
The invention provides a method for measuring strain on the basis of a thin-core fiber Mach-Zehnder interferometer. The method includes steps of a), constructing the thin-core fiber Mach-Zehnder interferometer and sequentially connecting the thin-core fiber Mach-Zehnder interferometer with a pumping source, a wavelength division multiplexer and a thin-core fiber Mach-Zehnder structure; b), clinging the thin-core fiber Mach-Zehnder structure to a controllable strain material; c), gradually changing strain degrees of the material, recording movement lengths of comb spectra and drawing change curves of the movement lengths of the comb spectra and the strain degrees of the material; d), measuring the strain of the material by the aid of the change curves of the movement lengths of the comb spectra and the strain degrees of the material. The thin-core fiber Mach-Zehnder interferometer comprises a thin-core fiber, a first rare-earth-doped fiber and a second rare-earth-doped fiber. The thin-core fiber is welded between the first rare-earth-doped fiber and the second rare-earth-doped fiber by means of fusion.
Description
The cross reference of patent
This application claims what on October 13rd, 2015 submitted to, the Chinese invention patent Shen of application number cn201510671672.x
Preference please.
Technical field
The present invention relates to fibre optic interferometer field, in particular to a kind of based on thin-core fibers Mach-Zehnder interferometer
Material strain measuring method.
Background technology
Generally, to have compact conformation, long service life, transmission channel sensitive to test volume many for the sensor of all-fiber
It is widely used in the fields such as Fibre Optical Sensor, fiber optic communication, optical manufacturing etc. advantage.By fiber end face micro-processing technology or take
Build the full-fiber sensor with interference structure, under pumping source effect, output has the interference spectral curve of pectination spectral pattern.Existing
There is a kind of Mach-Zehnder interferometer based on twin-core fiber in technology, interference fringe lining amplitude ratio is about 10dbm, and fringe spacing is about
For 2nm.Two 3db bonders are made Mach-Zehnder interference system, in conjunction with twin-core fiber, constitutes the Mach of two-stage structure-once
Deccan interferometer, striped lining amplitude ratio is about 30dbm.
Thin-core fibers Mach-Zehnder optical fiber sensor construction is simple and is easily achieved, and this structure is melted by one section of thin-core fibers
It is connected in two sections of relatively thick rare earth doped optical fibre optical fiber of core diameter, effectively can accurately obtain the interference spectrum of pectination spectral pattern
Curve, accordingly, it would be desirable to carry out accurate, efficient survey by one kind based on thin-core fibers Mach-Zehnder interferometer to material strain
Amount.
Content of the invention
According to the invention provides a kind of material strain measuring method based on thin-core fibers Mach-Zehnder interferometer, institute
State measuring method to comprise the following steps:
B) build described thin-core fibers Mach-Zehnder interferometer, described thin-core fibers Mach-Zehnder interferometer passes through grating
Optical fiber is sequentially connected pumping source, a wavelength division multiplexer and thin-core fibers Mach-Zehnder structure；Described thin-core fibers Mach-
Once moral structure included one section of thin-core fibers, the first rare earth doped optical fibre and the second rare earth doped optical fibre, described thin-core fibers welding
Between the first rare earth doped optical fibre and the second rare earth doped optical fibre, described first rare earth doped optical fibre and the second rare earth doped light
The fine gain media as optical fiber laser；
B) described thin-core fibers Mach-Zehnder structure is fitted with controlled strain gauge material；
C) gradually change material strain size, the length of record comb spectrum movement, draw comb spectrum movable length and material
The change curve of strain size；
D) by the change curve of described comb spectrum movable length and material strain size, material strain is measured.
Preferably, described pumping source is used as optical fiber laser by a laser diode.
Preferably, described first rare earth doped optical fibre and doping light that the second rare earth doped optical fibre is rare earth doped element
Fibre, for the gain of optical fiber laser.
Preferably, described wavelength division multiplexer is used for for coupling pump light entering the first rare earth doped optical fibre.
Preferably, the method for the fixation described in step b) is by described thin-core fibers, the first rare earth doped optical fibre and
Two rare earth doped optical fibres and strain gauge material are combined into one, and control the size of material strain that material strain is demarcated, described demarcation
Process is using one or more of being stretched to material, compressed or bent.
Preferably, described comb spectrum movable length and the change curve of material strain size pass through linear fit or minimum
Square law is fitted.
Preferably, described first rare earth doped optical fibre and the second rare earth doped element optical fiber are selected from Er-doped fiber, mix ytterbium light
Fibre or one kind of erbium-ytterbium co-doped fiber.
A kind of material strain measuring method measurement based on thin-core fibers Mach-Zehnder interferometer provided by the present invention is accurate
Really efficiently it is easy to operation, can be suitable in multiple applications.
It should be appreciated that aforementioned description substantially and subsequently detailed description are exemplary illustration and explanation, should not
As the restriction to the claimed content of the present invention.
Brief description
With reference to the accompanying drawing enclosed, the more purpose of the present invention, function and advantage will be as follows by embodiment of the present invention
Description is illustrated, wherein:
Fig. 1 diagrammatically illustrates the material strain measurement structural representation of thin-core fibers Mach-Zehnder interferometer of the present invention；
Fig. 2 shows the welding schematic diagram of thin-core fibers of the present invention and grating fibers；
Fig. 3 shows the flow chart based on the material strain measuring method of thin-core fibers Mach-Zehnder interferometer for the present invention；
Fig. 4 shows that in one embodiment of the invention, comb spectrum is with the curve of material strain size variation.
Specific embodiment
By reference to one exemplary embodiment, the purpose of the present invention and function and the side for realizing these purposes and function
Method will be illustrated.However, the present invention is not limited to one exemplary embodiment disclosed below；Can by multi-form Lai
It is realized.The essence of description is only to aid in the detail of 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 represent identical
Or similar part, or same or similar step.
A kind of material strain measuring method based on thin-core fibers Mach-Zehnder interferometer is described in detail in the present embodiment,
The material strain measurement structural representation of thin-core fibers Mach-Zehnder interferometer of the present invention as shown in Figure 1, described thin-core fibers horse
Conspicuous-Zehnder interferometer includes a laser diode as 101, wavelength division multiplexer (wdm) of pumping source of optical fiber laser
102 and thin-core fibers Mach-Zehnder structure, described thin-core fibers Mach-Zehnder structure include one section of thin-core fibers 104,
One rare-earth doped optical fibre 103 and the second rare earth doped fiber 105, the welding of described thin-core fibers 104 is in the first rare earth doped optical fibre 103 He
Between second rare earth doped optical fibre 105.First rare earth doped optical fibre 103 and the second rare earth doped optical fibre adopt rare earth doped element
Doped fiber as optical fiber laser gain media, the first rare earth doped optical fibre 103 and the second rare earth doped element optical fiber
105 one kind being selected from Er-doped fiber, Yb dosed optical fiber or erbium-ytterbium co-doped fiber, wavelength division multiplexer 102 is used for coupling pump light
Enter the first rare earth doped optical fibre 103.
Thin-core fibers Mach-Zehnder structure is fitted with strain gauge material 106 and is combined into one, and controls the change of material strain,
Can be that material is carried out drawing house in certain embodiments, so that material produces strain, can be in further embodiments
Material is compressed, so that material produces strain, can also be that material is curved in further embodiments, thus
Make material produce strain, can also be in further embodiments and material is carried out draw house, compression or bending multiple combination, thus
Material is made to produce strain.By carrying out drawing house to material in the present embodiment, so that material produces strain.
The present embodiment thin-core fibers 104, the first rare earth doped optical fibre 103 and the second rare earth doped optical fibre 105 pass through grating
Optical fiber is serially connected, and the welding schematic diagram of thin-core fibers of the present invention as shown in Figure 2 and grating fibers, with thin-core fibers 202 phase
Mutually the grating fibers of welding are divided into the first grating fibers 201 and the second grating fibers 203, thin-core fibers 202, the first grating fibers
201 and second grating fibers 203 by fibre coating, fibre cladding and fiber cores form, exemplary the giving of the present embodiment accompanying drawing 2
Go out fibre coating 205, fibre cladding 206 and the fiber cores 207 of the second grating fibers 203.
It should be noted that the first rare earth doped optical fibre 103, the second rare earth doped optical fibre 105 and the first grating fibers
201 and second the core diameter size of grating fibers 203 should be greater than the core diameter size of thin-core fibers 104 (202).
Below for the material strain measurement side based on thin-core fibers Mach-Zehnder interferometer in one embodiment of the invention
The change of the light path during method and comb spectrum length is given and illustrates:
Total light intensity i is
Wherein i1、i2WithIt is respectively the light intensity of fibre core and covering and phase shift difference in thin-core fibers, and
Wherein, n1And n2It is respectively the effective refractive index of fibre core and covering, l1And l2It is respectively light beam in fibre core and covering
The length of transmission.Due to interfere arm equal length, and there is refractivity δ n, then have
From formula 1 and formula 3, the peak value in transmission spectrum occurs meeting at the wavelength of following formula, and wherein m is integer
2 π l δ n/ λ=2m π (4)
Through simplifying, formula 4 is expressed as
M=l δ n/ λ (5)
Carry out derivation to λ in formula 5 can obtain
δ m/ δ λ=- l δ n/ λ2(6)
Take δ m=1, the wavelength interval obtaining adjacent peak in af at wavelength lambda transmission spectrum is
| δ λ |=λ2/lδn (7)
From formula 7, thin-core fibers Mach-Zehnder of the present invention is combed dry in the comb spectrum of interferometer, the wavelength of adjacent peak
Interval is relevant with the refractivity of centre wavelength, thin-core fibers length and fibre core and covering.When centre wavelength one timing, adjacent peak
The wavelength interval of value is thin-core fibers length and the function of fibre core and bag index differential between layers.
This comb spectrum is applied to carry out sensing testing, when interferometer is affected to lead to strain gauge material to deform by material strain, from
And when causing two-arm optical path difference to change, interfere comb spectrum to change, interference fringe produces and moves.
In order to the material strain measurement side based on thin-core fibers Mach-Zehnder interferometer for the present invention is more clearly described
Method, the present embodiment illustrates with reference to the flow process of concrete material strain measuring method, and the present invention as shown in Figure 3 is based on thin-core fibers
The flow chart of the material strain measuring method of Mach-Zehnder interferometer；Material based on thin-core fibers Mach-Zehnder interferometer should
Become measuring method to comprise the steps:
Step 301, build thin-core fibers Mach-Zehnder interferometer, welding Mach-Zehnder structure；
Step 302, thin core Mach-Zehnder structure is fitted with strain gauge material, control the change of material strain；
Step 303, by material is carried out draw house make material produce strain be gradually increased tensile strength make material strain by
The cumulative length adding, recording comb spectrum movement, draws the change curve of comb spectrum movable length and material strain size；Wherein comb
Shape spectrum movable length is fitted by linear fit or method of least square with the change curve of material strain size, this enforcement
In example, the fit procedure of curve adopts least square fitting, by equation
Association type (8) and formula (9) obtain a0And a1, construct the approximating function meeting square approach condition.
F (x)=a0+a1x (10)
Step 304, by the change curve of comb spectrum movable length and material strain size, additional material strain is carried out
Measurement, in one embodiment of the invention as shown in Figure 4, comb spectrum is with the curve of material strain size variation.
Need associated fiber is entered with line parameter coupling according to the present invention, design parameter includes but is not limited to pumping wavelength, ripple
The coupling of division multiplexer, laser emitting wavelength and optical fiber parameter.In the present embodiment, parameter is as shown in table 1:
Table 1 optical fiber parameter based on thin-core fibers Mach-Zehnder interferometer according to the kind of the present invention
According to the present invention, the core diameter of rare earth doped optical fibre is determined by the Active Optical Fiber being adopted, covering core diameter is preferably 125
μm, the core diameter of fiber core can select 4 μm, 8 μm or 10 μm, preferably 10/125 μm.According to selected core diameter selection
Flm, wdm, ld tail optical fiber core diameter joined.The pumping wavelength that Er-doped fiber is mated can adopt 980nm or 1480nm, Yb dosed optical fiber
Pumping wavelength can adopt 976nm or 915nm, and the pumping wavelength of erbium-ytterbium co-doped fiber can adopt 976nm, according to wavelength and core diameter ginseng
Number further determines that the parameter of flm, wdm.The optical maser wavelength of final outgoing is in the certain gain ranging of Active Optical Fiber (as 1530-
1560nm) determined by the reflection wavelength of bragg grating.The typical exit wavelength of Yb dosed optical fiber is 1535nm, Er-doped fiber
Typical exit wavelength be 1064nm, the typical exit wavelength of erbium-ytterbium co-doped fiber is 1550nm.
For example, in the present embodiment, if being 10/125 μm of Er-doped fiber as gain media, ld tail optical fiber, wdm from core diameter
Same model core diameter need to be chosen with flm.Ld output wavelength 976nm, wdm operation wavelength 976/1550nm, flm operation wavelength
1550nm, fbg selection range is 1530nm-1560nm, can obtain laser output within the range.If in experiment from core diameter being
As gain media, ld tail optical fiber, wdm and flm need to choose same model core diameter to 10/125 μm of Yb dosed optical fiber.Ld is 915nm single mode
Output, wdm operation wavelength 915/1064nm, flm operation wavelength 1064nm, fbg chooses near 1064nm, can obtain within the range
Obtain laser output.
A kind of material strain measuring method measurement based on thin-core fibers Mach-Zehnder interferometer according to the present invention is accurately
Efficiently it is easy to operation, can be suitable in multiple applications.
Explanation in conjunction with the present invention disclosing here and practice, the other embodiment of the present invention is for those skilled in the art
All will be readily apparent and understand.Illustrate and embodiment be to be considered only as exemplary, the true scope of the present invention and purport equal
It is defined in the claims.
Claims (7)
1. a kind of material strain measuring method based on thin-core fibers Mach-Zehnder interferometer is it is characterised in that described measurement side
Method comprises the following steps:
A) build described thin-core fibers Mach-Zehnder interferometer, described thin-core fibers Mach-Zehnder interferometer passes through grating fibers
It is sequentially connected pumping source, a wavelength division multiplexer and thin-core fibers Mach-Zehnder structure；Described thin-core fibers Mach-Zehnder
Structure includes one section of thin-core fibers, the first rare earth doped optical fibre and the second rare earth doped optical fibre, and described thin-core fibers welding is
Between one rare earth doped optical fibre and the second rare earth doped optical fibre, described first rare earth doped optical fibre and the second rare earth doped optical fibre are made
Gain media for optical fiber laser；
B) described thin-core fibers Mach-Zehnder structure is fitted with controlled strain gauge material；
C) gradually change material strain size, the length of record comb spectrum movement, draw comb spectrum movable length and material strain
The change curve of size；
D) by the change curve of described comb spectrum movable length and material strain size, material strain is measured.
2. material strain measuring method according to claim 1 is it is characterised in that described pumping source passes through a laser
Diode is as optical fiber laser.
3. material strain measuring method according to claim 1 is it is characterised in that described first rare earth doped optical fibre and
Two rare earth doped optical fibres are the doped fiber of rare earth doped element, for the gain of optical fiber laser.
4. material strain measuring method according to claim 1 is it is characterised in that described wavelength division multiplexer is used for pump
Pu is optically coupled into the first rare earth doped optical fibre.
5. material strain measuring method according to claim 1 is it is characterised in that the method for the fixation described in step b)
It is that described thin-core fibers, the first rare earth doped optical fibre and the second rare earth doped optical fibre and strain gauge material are combined into one, control
The size of material strain is demarcated to material strain, and described calibration process is using in material being stretched, is compressed or being bent
Plant or multiple.
6. material strain measuring method according to claim 1 is it is characterised in that described comb spectrum movable length and material
The change curve of strain size is fitted by linear fit or method of least square.
7. material strain measuring method according to claim 3 is it is characterised in that described first rare earth doped optical fibre and
Two rare earth doped element optical fiber are selected from one kind of Er-doped fiber, Yb dosed optical fiber or erbium-ytterbium co-doped fiber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510671672X | 2015-10-13 | ||
| CN201510671672 | 2015-10-13 |
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| CN106352807A true CN106352807A (en) | 2017-01-25 |
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| CN201610847994.XA Pending CN106352807A (en) | 2015-10-13 | 2016-09-23 | Method for measuring strain of material on basis of thin-core fiber Mach-Zehnder interferometer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907070A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of strain measurement system based on MZ filter structure optical fiber lasers |
| CN108007377A (en) * | 2017-12-27 | 2018-05-08 | 北京信息科技大学 | One kind is based on thin-core fibers laser strain measurement system and its test method |
| CN109798977A (en) * | 2018-12-27 | 2019-05-24 | 北京信息科技大学 | Temperature and strain measurement method based on fiber bragg grating and thin-core fibers |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907070A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of strain measurement system based on MZ filter structure optical fiber lasers |
| CN108007377A (en) * | 2017-12-27 | 2018-05-08 | 北京信息科技大学 | One kind is based on thin-core fibers laser strain measurement system and its test method |
| CN109798977A (en) * | 2018-12-27 | 2019-05-24 | 北京信息科技大学 | Temperature and strain measurement method based on fiber bragg grating and thin-core fibers |
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