CN106705877A - High-sensitivity fiber Bragg grating strain sensor based on flexible hinges - Google Patents
High-sensitivity fiber Bragg grating strain sensor based on flexible hinges Download PDFInfo
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- CN106705877A CN106705877A CN201710040819.4A CN201710040819A CN106705877A CN 106705877 A CN106705877 A CN 106705877A CN 201710040819 A CN201710040819 A CN 201710040819A CN 106705877 A CN106705877 A CN 106705877A
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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
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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Abstract
The invention discloses a high-sensitivity fiber Bragg grating strain sensor based on flexible hinges. The high-sensitivity fiber Bragg grating strain sensor comprises an elastic strain substrate and a fiber Bragg grating cluster, wherein the elastic strain substrate comprises a transverse beam, an elastic strain unit, a fixed end and displacement amplification mechanisms; two ends of the transverse beam are connected with the fixed end through the elastic strain unit respectively, so that a temperature compensation mechanism is formed; the displacement amplification mechanisms are symmetrically distributed at upper and lower sides of the transverse beam along the transverse axis; the fiber Bragg grating cluster comprises a strain measurement grating and a temperature compensation grating; the strain measurement grating is located at a longitudinal axis position of the elastic strain substrate and is mounted on two longitudinal displacement arms; two ends of the temperature compensation grating are located at a transverse axis position of the elastic strain substrate and the temperature compensation grating is mounted on the transverse beam. The high-sensitivity fiber Bragg grating strain sensor based on the flexible hinges has the advantages of great strain sensitivity, simple and small structure, high reliability, easiness of being mounted and capability of effectively eliminating temperature drift, and is suitable for high-precision strain measurement of a small measurement range in all mechanical structures.
Description
Technical field
The present invention relates to fiber optic sensor technology field, and in particular to a kind of highly sensitive fiber grating based on flexible hinge
Strain transducer, is particularly suited for the high-acruracy survey of dependent variable in all kinds of mechanical structures.
Background technology
There is fiber grating small volume, lightweight, explosion-proof, high to electric insulation, electromagnetism interference, reliability, environment to adapt to
Property it is good, and the characteristics of multiple measurement gratings for different parameters form distributed sensor can be arranged on simple optical fiber,
Therefore one of study hotspot of sensory field of optic fibre is turned into.Fiber Bragg grating strain sensor is using grating strain amount and Prague
Relation between wavelength carries out strain measurement, at present the health monitoring in heavy constructions such as bridge, dam, mine and power stations and safety
Early warning field is widely used.
In recent years, fiber Bragg grating strain sensor is developed rapidly to other application field, including such as machine tool structure, tooth
The deformation monitoring of the mechanical structures such as roller box system, aircraft wing and satellite sun energy plate and operation maintenance.The above machinery knot
Often design rigidity is high for structure, deflection is small, relative to strain measurement narrow range, plastic strain amplitude that heavy construction builds its measurement point
It is small, it is necessary to sensor has larger strain sensitivity.And some special complex mechanical structure inner spaces are limited, to passing
There is strict demand in the size of sensor and installation operation space.
At present, the encapsulation of fiber Bragg grating strain sensor mainly includes tubular type, embedded and substrate formula encapsulating structure.Its
Middle tube-packaged imbeds installation in being primarily adapted for use in building, and stock size is larger, it is difficult to answered installed in mechanical structure surface
Become measurement.Embedded encapsulation is installed to surface to be measured by the way that naked grating is directly embedded into other organic polymer binder matrix,
But because the strain of polymeric matrix causes damage to transmission efficiency, its strain sensitivity is less than bare optical fibers and bare optical gratings.China
In the substrate formula encapsulation scheme that patent of invention Publication No. CN101571380 is provided, fiber grating is fixed on flat board bullet
On the metal substrate of spring structure, sensor two ends are allow to bear large strain (± 2500 μ ε), this scheme can be realized largely
The strain sensing of journey scope, but the strain sensitivity to fiber grating does not make corresponding improvement, it is difficult to tied suitable for machinery
Small strain measurement in structure.
The content of the invention
The technical problems to be solved by the invention are tight for a kind of deficiency structure of offer of above-mentioned prior art presence
Gather, the certainty of measurement highly sensitive fiber Bragg grating strain sensor based on flexible hinge high.
The technical solution adopted in the present invention is：A kind of highly sensitive fiber Bragg grating strain sensor based on flexible hinge,
It is characterized in that：Including elastic strain substrate and fiber grating string, the elastic strain substrate has longitudinal axis and lateral shaft
Line, and be symmetrical arranged along longitudinal axis and axis of pitch respectively, including crossbeam, elastic strain unit, fixing end, displacement equations machine
Structure, the two ends of the crossbeam are connected by elastic strain unit with fixing end respectively, constitute temperature compensation mechanism, and the displacement is put
Transversely axisymmetrical is laid in the both sides up and down of crossbeam to great institutions, and the displacement amplifying mechanism includes a length travel arm and two
Individual rotation linking arm, the two ends of the length travel arm symmetrically connect rotation linking arm by the second flexible hinge respectively, described
Two external end heads for rotating linking arm are connected by the first flexible hinge with corresponding fixing end respectively, first flexible hinge
The center line laying in a certain angle of center line and the second flexible hinge, the fiber grating string includes strain measurement grating and temperature
Degree null grating, the strain measurement grating is located at the longitudinal axis position of elastic strain substrate, is installed in two length travel arms
On, the two ends of the temperature-compensating grating are located at the axis of pitch position of elastic strain substrate, are installed on crossbeam.
By above-mentioned technical proposal, the elastic strain unit is O-shaped elastic strain unit.
By above-mentioned technical proposal, the strain measurement grating is fixed to two length travel arms under prestressing force straight condition
On.
By above-mentioned technical proposal, the temperature-compensating grating is fixed to crossbeam two ends under free bent state.
By above-mentioned technical proposal, the temperature-compensating grating and strain measurement grating are respectively adopted glass solder and are welded on bullet
In property strained substrate.
By above-mentioned technical proposal, the symmetrical centre point of first flexible hinge and the symmetrical centre point of the second flexible hinge
The axis of pitch of line and length travel arm set in 3~10 ° of angle.
By above-mentioned technical proposal, first flexible hinge is connected or center connection with linking arm bias is rotated, and second is soft
Property hinge with rotate linking arm or length travel arm bias be connected or center connection.
By above-mentioned technical proposal, mounting hole is provided with fixing end.
By above-mentioned technical proposal, the structure of the first flexible hinge and the second flexible hinge is identical, including hinge bodies,
Hinge bodies are symmetrically arranged on two with arc groove.
Having the beneficial effect that acquired by the present invention：
1st, the flexible hinge displacement enlarger that there are a pair to be along the horizontal axis of symmetry of the invention, the quilt that fixing end is perceived
The transversely deforming amount for surveying object amplifies the displacement output for being delivered to length travel arm by displacement amplifying mechanism, will can be fixed on vertical
Improve ten times to the sensitivity of strain measurement grating in displacement arm, and can simultaneously realize temperature-compensating, with strain sensitivity it is big,
The advantage that simple structure is compact, reliability is high, is easily installed and can effectively eliminate temperature drift, it is adaptable in all kinds of mechanical structures
The high accuracy strain measurement of small-range scope.
2nd, strain measurement grating had carried out pre- tensioning before elastic strain substrate is welded and fixed, and enabled the sensor to survey
Measure the positive negative strain of object under test.
3rd, the temperature-compensating grating on elastic strain substrate crossbeam is in free bend shape, and O-shaped on substrate
Easily there is elastic deformation in elastic strain unit, it is ensured that crossbeam is insensitive to transverse strain after strain is loaded, will not be in measurement
During disturbance is produced to the offset of temperature-compensating grating.
4th, fiber Bragg grating strain sensor simple structure of the present invention, is made up of, bullet elastic strain substrate and fiber grating string
Property strained substrate can clamped one time machine-shaping, simple structure, low cost, long-term reliability it is good.
5th, fiber grating strain transducer size of the present invention is small, and fiber grating string can select to draw on lateral shaft or longitudinal axis
Go out, it is easy to accomplish the installation in compact conformation, the mechanical structure of narrow space.
Brief description of the drawings
Fig. 1 is front view of the invention.
Fig. 2 is side view of the invention.
Fig. 3 is a kind of arrangement schematic diagram of the first flexible hinge and the second flexible hinge.
Fig. 4 is another arrangement schematic diagram of the first flexible hinge and the second flexible hinge.
The mark of each part is as follows in accompanying drawing：1st, elastic strain substrate；2nd, the first flexible hinge；3rd, O-shaped elastic strain list
Unit；4th, linking arm is rotated；5th, the second flexible hinge；6th, length travel arm；7th, glass solder joint；8th, crossbeam；9th, fixing end；10th, pacify
Dress hole；11st, strain measurement grating；12nd, temperature-compensating grating；13rd, fiber grating string.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1, 2, a kind of highly sensitive fiber Bragg grating strain sensor based on flexible hinge is present embodiments provided,
Including elastic strain substrate 1 and fiber grating string 13, strain measurement grating 11 and temperature-compensating grating on fiber grating string 13
12 two ends are fixed on relevant position on elastic strain substrate 1.
The elastic strain substrate 1 has longitudinal axis and axis of pitch, and respectively along longitudinal axis and axis of pitch pair
Claim to set, including crossbeam 8, O-shaped elastic strain unit 3, fixing end 9, displacement amplifying mechanism, the two ends of the crossbeam 8 lead to respectively
Cross elastic strain unit 3 to be connected with fixing end 9, constitute temperature compensation mechanism, the displacement amplifying mechanism transversely axisymmetrical
The both sides up and down of crossbeam 8 are laid in, the displacement amplifying mechanism includes a length travel arm 6 and two rotation linking arms 4, described
The two ends of length travel arm 6 rotate linking arm 4 by the symmetrical connection of the second flexible hinge 5 respectively, and described two rotate linking arm 4
External end head is connected by the first flexible hinge 2 with corresponding fixing end 9 respectively, the symmetrical centre point of first flexible hinge 2
Laid in the angle of α with the axis of pitch of length travel arm 6 with the line of the symmetrical centre point of the second flexible hinge 5, wherein, α
Value is 3~10 °, preferably 5 °.First flexible hinge 2 is connected or center connection with the bias of linking arm 4 is rotated, and second is flexible
The two ends of hinge 5 are eccentric with rotation linking arm 4 and length travel arm 6 respectively to be connected or center connection, and Fig. 3 and Fig. 4 illustrate respectively
(the first flexible hinge in Fig. 3 is connected to the center for rotating linking arm 4 to two kinds of connected modes, the second flexible hinge
Two ends are connected to the center for rotating linking arm and length travel arm；The first flexible hinge is connected to rotation and connects in Fig. 4
The eccentric position of arm is connect, the two ends of the second flexible hinge are connected to length travel arm and rotate the eccentric position of linking arm).
Fiber grating string 13 includes strain measurement grating 11 and temperature-compensating grating 12, and the strain measurement grating 11 is located at elastic strain
The longitudinal axis position of substrate 1, the two ends of strain measurement grating 11 are under prestressing force straight condition by transversely axisymmetrical
Glass solder joint 7 is connected respectively on two length travel arms 6, and the two ends of the temperature-compensating grating 12 are under free bent state
The two ends of crossbeam 8 are connected respectively to by along the axisymmetric glass solder joint 7 in longitudinal direction.
In the present embodiment, the first flexible hinge 2 is identical with the structure of the second flexible hinge 5, including hinge bodies, in hinge
Chain body is symmetrically arranged on two with arc groove.
In the present embodiment, mounting hole 10 is provided with fixing end 9, is connected by the welding to mounting hole 10 or bolt when using
Connect and two fixing ends 9 of elastic strain substrate are fixed in the measurement position of object under test, the horizontal stroke that object under test is produced during work
Dorsad displacement is produced between driving two fixing ends 9 to normal strain, the lateral displacement of fixing end 9 is pulled by the first flexible hinge 2 and turned
Dynamic linking arm 4, and be delivered to length travel arm 6 by the second flexible hinge 5, makes between two symmetrical length travel arms 6 in longitudinal direction
It is upper to produce the dorsad displacement for decupling the lateral displacement amount of fixing end 9；Opposite, driven when object under test produces horizontal negative strain
Opposite displacement is produced between two fixing ends 9, is produced in the vertical between making two symmetrical length travel arms 6 and is decupled fixing end 9 laterally
The opposite displacement of displacement.The two ends under pre- tensile state of strain measurement grating 11 are fixed to length travel by glass solder joint 7
On arm 6, can be realized to the positive negative strain of testee with the dorsad displacement between sensed quantity length travel arm 6 or opposite displacement
High-sensitivity measurement.Temperature-compensating grating 12 is fixed on crossbeam 8 in free bend shape by two ends glass solder joint 7, correspondence
The wave length shift that change measurement grating 11 is caused in measurement process by temperature is compensated.A pair on elastic strain substrate 1 are O-shaped
Easily there is elastic deformation in elastic strain unit 3, it is ensured that transverse strain of the crossbeam 8 to elastic strain substrate 1 in measurement process
Insensitive, offset that will not be to temperature-compensating grating 12 in measurement process produces disturbance.
In the present embodiment, the size of elastic strain piece 1 is 40 × 12 × 0.5mm, and the strain sensitivity of the sensor is about
It is 10pm/ μ ε, is applicable to the high-acruracy survey of various mechanical structure deformations.
Claims (9)
1. a kind of highly sensitive fiber Bragg grating strain sensor based on flexible hinge, it is characterised in that：Including elastic strain substrate
With fiber grating string, the elastic strain substrate has longitudinal axis and axis of pitch, and respectively along longitudinal axis and lateral shaft
Line is symmetrical arranged, including crossbeam, elastic strain unit, fixing end, displacement amplifying mechanism, and the two ends of the crossbeam pass through bullet respectively
Property strain unit be connected with fixing end, composition temperature compensation mechanism, transversely axisymmetrical is laid in the displacement amplifying mechanism
The both sides up and down of crossbeam, the displacement amplifying mechanism includes a length travel arm and two rotation linking arms, the length travel
The two ends of arm symmetrically connect rotation linking arm by the second flexible hinge respectively, and the external end head of the two rotations linking arm leads to respectively
The first flexible hinge and corresponding fixing end is crossed to be connected, the symmetrical centre point of first flexible hinge and the second flexible hinge
The line of symmetrical centre point and the axis of pitch laying in a certain angle of length travel arm, the fiber grating string include that strain is surveyed
Amount grating and temperature-compensating grating, the strain measurement grating are located at the longitudinal axis position of elastic strain substrate, are installed in two
On length travel arm, the two ends of the temperature-compensating grating are located at the axis of pitch position of elastic strain substrate, are installed in crossbeam
On.
2. strain transducer according to claim 1 and 2, it is characterised in that：The elastic strain unit should for O-shaped elasticity
Become unit.
3. strain transducer according to claim 1 and 2, it is characterised in that：The strain measurement grating draws in prestressing force
It is fixed on two length travel arms under straight state.
4. strain transducer according to claim 1 and 2, it is characterised in that：The temperature-compensating grating is in free bend
Crossbeam two ends are fixed under state.
5. strain transducer according to claim 1 and 2, it is characterised in that：The temperature-compensating grating and strain measurement
Grating is respectively adopted glass solder and is welded on elastic strain substrate.
6. strain transducer according to claim 1 and 2, it is characterised in that：The symmetrical centre of first flexible hinge
The line of the symmetrical centre point of point and the second flexible hinge is set with the axis of pitch of length travel arm in 3~10 ° of angle.
7. strain transducer according to claim 6, it is characterised in that：First flexible hinge is inclined with rotation linking arm
The heart is connected or center connection, and the second flexible hinge is connected with rotation linking arm or length travel arm bias or center connects.
8. strain transducer according to claim 1 and 2, it is characterised in that：Mounting hole is provided with fixing end.
9. strain transducer according to claim 1 and 2, it is characterised in that：First flexible hinge and the second flexible hinge
Structure it is identical, including hinge bodies, arc groove is symmetrically arranged on two with hinge bodies.
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| CN201710040819.4A CN106705877B (en) | 2017-01-20 | 2017-01-20 | A kind of highly sensitive fiber Bragg grating strain sensor based on flexible hinge |
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| CN201710040819.4A CN106705877B (en) | 2017-01-20 | 2017-01-20 | A kind of highly sensitive fiber Bragg grating strain sensor based on flexible hinge |
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| CN106705877B CN106705877B (en) | 2019-05-24 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907241A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of substrate formula FBG temperature sensitizing sensors and performance test methods |
| CN108759702A (en) * | 2018-06-06 | 2018-11-06 | 河海大学 | A kind of system and monitoring method for the arch of distributed monitoring track plates |
| CN110567378A (en) * | 2019-09-04 | 2019-12-13 | 中南大学 | optical fiber displacement sensor and measuring method thereof |
| CN112097884A (en) * | 2020-06-09 | 2020-12-18 | 承德石油高等专科学校 | Dynamic rail weighing fiber grating pressure sensor with flexible amplifying structure |
| CN113280957A (en) * | 2021-04-16 | 2021-08-20 | 中山市精量光电子科技有限公司 | FBG pressure sensor based on diaphragm and flexible hinge lever mechanism |
| CN114251348A (en) * | 2020-09-25 | 2022-03-29 | 武汉科技大学 | Asymmetric flexible hinge |
| CN114295070A (en) * | 2021-12-31 | 2022-04-08 | 澳门大学 | Long-gauge fiber grating strain sensor |
| CN114459645A (en) * | 2022-01-18 | 2022-05-10 | 武汉理工大学 | Fiber grating pressure sensor based on arc hinge |
| CN114719817A (en) * | 2022-04-18 | 2022-07-08 | 中国船舶重工集团公司第七一九研究所 | Method for measuring deformation of metal flexible connecting pipe during operation |
| CN115770019A (en) * | 2022-12-06 | 2023-03-10 | 天津大学 | Pulse measurement sensing device and measurement system |
| CN116793260A (en) * | 2023-07-01 | 2023-09-22 | 中国矿业大学 | Fiber bragg grating curvature sensing testing device and testing method thereof |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907241A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of substrate formula FBG temperature sensitizing sensors and performance test methods |
| CN107907241B (en) * | 2017-12-27 | 2020-11-20 | 北京信息科技大学 | Substrate type FBG temperature sensitization sensor and performance testing method |
| CN108759702A (en) * | 2018-06-06 | 2018-11-06 | 河海大学 | A kind of system and monitoring method for the arch of distributed monitoring track plates |
| CN110567378A (en) * | 2019-09-04 | 2019-12-13 | 中南大学 | optical fiber displacement sensor and measuring method thereof |
| CN110567378B (en) * | 2019-09-04 | 2020-08-14 | 中南大学 | Optical fiber displacement sensor and measuring method thereof |
| CN112097884A (en) * | 2020-06-09 | 2020-12-18 | 承德石油高等专科学校 | Dynamic rail weighing fiber grating pressure sensor with flexible amplifying structure |
| CN114251348A (en) * | 2020-09-25 | 2022-03-29 | 武汉科技大学 | Asymmetric flexible hinge |
| CN113280957A (en) * | 2021-04-16 | 2021-08-20 | 中山市精量光电子科技有限公司 | FBG pressure sensor based on diaphragm and flexible hinge lever mechanism |
| CN114295070A (en) * | 2021-12-31 | 2022-04-08 | 澳门大学 | Long-gauge fiber grating strain sensor |
| CN114459645A (en) * | 2022-01-18 | 2022-05-10 | 武汉理工大学 | Fiber grating pressure sensor based on arc hinge |
| CN114459645B (en) * | 2022-01-18 | 2023-05-23 | 武汉理工大学 | Fiber grating pressure sensor based on arc hinge |
| CN114719817A (en) * | 2022-04-18 | 2022-07-08 | 中国船舶重工集团公司第七一九研究所 | Method for measuring deformation of metal flexible connecting pipe during operation |
| CN114719817B (en) * | 2022-04-18 | 2024-06-25 | 中国船舶重工集团公司第七一九研究所 | Method for measuring deformation of metal flexible connecting pipe during operation |
| CN115770019A (en) * | 2022-12-06 | 2023-03-10 | 天津大学 | Pulse measurement sensing device and measurement system |
| CN115770019B (en) * | 2022-12-06 | 2024-04-26 | 天津大学 | Pulse measurement sensing device and measurement system |
| CN116793260A (en) * | 2023-07-01 | 2023-09-22 | 中国矿业大学 | Fiber bragg grating curvature sensing testing device and testing method thereof |
| CN116793260B (en) * | 2023-07-01 | 2024-06-07 | 中国矿业大学 | Fiber bragg grating curvature sensing testing device and testing method thereof |
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