CN102997860B - Surface-mounted fiber bragg grating strain gauge - Google Patents
Surface-mounted fiber bragg grating strain gauge Download PDFInfo
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- CN102997860B CN102997860B CN201210488840.8A CN201210488840A CN102997860B CN 102997860 B CN102997860 B CN 102997860B CN 201210488840 A CN201210488840 A CN 201210488840A CN 102997860 B CN102997860 B CN 102997860B
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Abstract
The invention discloses a surface-mounted fiber bragg grating strain gauge. The surface-mounted fiber bragg grating strain gauge comprises a moving support, a fixing support, a casing, outgoing holes, a pulling element, a pressing element, a transmission optical fiber and a transmission rod, wherein two outgoing holes are arranged on the same side of the casing, the fixing support is fixedly connected with the casing, the moving support is moveably connected with the casing, the transmission rod penetrates through a first side wall of the casing, the moving support, the fixing support and a second side wall of the casing sequentially, the transmission rod comprises an inner tube and an outer tube, the tail end of the inner tube is connected with the pressing element, the tail end of the outer tube is connected with the pulling element, a first positioning element, a second positioning element and a first fixed range element are arranged on the same side of the outer tube, a third positioning element, a fourth positioning element and a second fixed range element are arranged on the same side of the inner tube, the transmission optical fiber is led in from one outgoing hole of the casing, penetrates through the moving support, the fixing support and the fixing support sequentially and is led out from the other outgoing hole, and a measurement grating is arranged on the transmission optical fiber.
Description
Technical field
The present invention relates to a kind of engineering measurer, particularly a kind of object of measuring is by the surface-mount type fiber grating strain meter of external influence surface strain variations.
Background technology
At present, be resistance-type, condenser type and inductance type for measuring the major way of body surface strain variation.The most frequently used is exactly resistance strain gage, both few use rear.But electric-type sensor, by the impact of the unfavorable factors such as corrosion and fatigue, particularly lightening strikes, is easy to lose efficacy.
Summary of the invention
For the deficiency of electric-type sensor, the present invention proposes a kind of surface-mount type fiber grating strain meter, particularly fiber grating (FBG) and propose a kind of surface-mount type FBG strainometer for achieving the above object as sensitive element.
The technical solution used in the present invention is as follows:
A kind of surface-mount type fiber grating strain meter, comprise travel(l)ing rest, fixed support, shell, fairlead, pull element, press element, Transmission Fibers and drive link, described shell the same side is provided with two fairleads, described fixed support is fixedly connected with shell, described travel(l)ing rest is flexibly connected with shell, described drive link is successively through the first side wall of shell, travel(l)ing rest, second sidewall of fixed support and shell, drive link comprises inner and outer tubes, interior pipe end with press element and be connected, outer tube end is connected with pulling element, the same side of described outer tube is provided with directed element I, directed element II and quantitative journey element I, the same side of described interior pipe is connected with directed element III, directed element IV and quantitative journey element II, described Transmission Fibers is introduced from a fairlead of shell, successively through first hole and support bracket fastened first hole of travel(l)ing rest, then wraparound is through second hole of support bracket fastened second hole, travel(l)ing rest, and draw from another fairlead of shell, described Transmission Fibers is provided with measurement grating.
Described Transmission Fibers is also provided with temperature compensation grating.
Described pulling element and press element is rectangular block, and on rectangular block, be provided with threaded hole and groove, and described groove coordinates with drive link.
Described pulling element and press element is fixed on testee by screw.
Described housing first sidewall and shell second sidewall are two opposition parallel surfaces.
Described directed element I and directed element III are close to travel(l)ing rest and arrange, and described directed element II and directed element IV are close to fixed support and arrange.
The inner side of the first side wall apart from shell is located at by described quantitative journey element I, and distance is d
2=7860*D; Wherein D is the distance between travel(l)ing rest and fixed support.
Described quantitative journey element II is located between fixed support and shell second sidewall, and is d apart from support bracket fastened distance
1=7860*D; Wherein D is the distance between travel(l)ing rest and fixed support.
Described inner and outer tubes are plugged in together, and outer tube wall has groove, and the effect of groove is in order to inwall is spilt cruelly, and pipe is connected with quantitative journey element II with directed element III, directed element IV, and inner and outer tubes are self-movements.
Described directed element I, directed element II, directed element III, directed element IV, quantitatively journey element I, quantitatively journey element II are rectangular block.
The moving range of described quantitative journey element determination sensor activity element is no more than the strain limit value of grating.When sensor is subject to compressive strain, press the element element of the activity when pressurized (only) movable and pull element (element of activity time only in tension) because directed element II is with support bracket fastened effect and inertia.Pressing element makes travel(l)ing rest movable and then make measurement grating FBG 1 tension by directed element III, and now grating FBG 2 not can be used as temperature compensation grating by the impact of external forces and uses.Grating due to by quantitative element II affect its strain be less than the theoretical maximum strain of grating all the time time, the sensitive element of effective protection sensor.When sensor is subject to stretching strain, pull element movable and press element because directed element IV is with support bracket fastened effect and inertia, pull element to make travel(l)ing rest movable and then make grating FBG 2 tension by directed element I, now grating FBG 1 not can be used as temperature compensation grating by the impact of external forces and uses.Sensor grating due to by quantitative element I affect its strain be less than the theoretical maximum strain of grating all the time time, the sensitive element of effective protection sensor.So, this sensor realizes its characteristic that is directed, quantitatively journey.
For reducing the cross sensitivity between temperature and strain, described sensor is provided with temperature compensation grating.When this sensor is under pressure, temperature compensation grating is FBG2; When this sensor under tension, temperature compensation grating is FBG1.Design so, can demonstrate testee very is clearly pressurized or tension.When testee is subject to different external influence, responsive grating and temperature compensation grating exchange, and such design significantly can increase the serviceable life of this sensor and increase its range ability.
The invention has the beneficial effects as follows: this strainometer should have not by the characteristic of electromagnetic interference (EMI), directionality, interchangeability, quantitatively journey.
Accompanying drawing explanation
Fig. 1 is the cut-open view of this sensor;
Fig. 2 shell mechanism vertical view;
Fig. 3 shell mechanism side view;
The side view of Fig. 4 travel(l)ing rest;
The vertical view of Fig. 5 movable element 2;
Fig. 6 drive link and other parts connection layout;
In figure: 1 travel(l)ing rest, 2 fixed supports, 3 shells, 4 fairleads, 5 pull element, and 6 press element, 7 threaded holes, 8 drive links, the quantitative journey element II of 9 quantitative journey element I, 10,11 directed element III, 12 directed element I, 13 directed elements II, pipe in 14 directed elements IV, 15,16 outer tubes, 17 Transmission Fibers, FBG1 grating, FBG2 grating.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
As shown in figs 1 to 6, the present invention includes shell 3, travel(l)ing rest 1, fixed support 2, Transmission Fibers 17, grating FBG 1, grating FBG 2, pull element 5, press element 6, directed element and quantitative journey element etc.Pull element 5 and press element 6 and be provided with groove so that drive link 8 inserts, and pull element 5 and press element 6 coaxial, shell 3 the same side is provided with two optical fiber fairleads 4, fixed support 2 is fixedly connected with shell 3, travel(l)ing rest 1 is located on shell 3, and be flexibly connected, described drive link 8 is successively through the first side wall of shell 3, travel(l)ing rest 1, second sidewall of fixed support 2 and shell 3, drive link 8 comprises interior pipe 15 and outer tube 16, interior pipe 15 end with press element 6 and be connected, outer tube 16 end is connected with pulling element 5, the same side of described outer tube 16 is provided with directed element I 12, directed element II 13 and quantitative journey element I 9, the same side of described interior pipe is connected with directed element III 11, directed element IV 14 and quantitative journey element II 10, described Transmission Fibers 17 is introduced from a fairlead 4 of shell, successively through first hole of travel(l)ing rest 1 and first hole of fixed support 2, then wraparound is through second hole of fixed support 2, second hole of travel(l)ing rest 1, and draw from another fairlead 4 of shell 3, described Transmission Fibers 17 is provided with measurement grating.
Being mainly used in of the optical fiber fairlead 4 of its housing 3 is drawn Transmission Fibers 17 and realizes sensor network.The effect of directed element III 11, directed element I 12 be testee be under pressure or pulling force time, determine that FBG1 and FBG2 is temperature compensation grating or stressed grating; The effect of directed element II 13, directed element IV 14 be testee be under pressure or pulling force time, determine that pulling element 5 still to press element 6 moves; Quantitative journey element I 9, the quantitatively effect of journey element II 10 are that protection sensitive element grating is no more than theoretical maximum strain value 7860 μ ε in the testee strain be subject to suffered by external influence; Threaded hole 7 Main Function pulling element 5 and press element 6 for by sensor and testee compact siro spinning technology, expects that reaching the extraneous strain transfer efficiency strained between sensor sensing element is 100%.
For reducing the cross sensitivity of strain and temperature, this sensor setting temperature compensation grating.Its specific works principle is: when sensor is subject to compressive strain, presses the element element of the activity when pressurized (only) 6 movable and pull element (element of activity time only in tension) 5 because of the effect of directed element II 13 and fixed support 2 and inertia.Pressing element 6 makes travel(l)ing rest 1 movable and then make grating FBG 1 tension by directed element III 11, and now grating FBG 2 not can be used as temperature compensation grating by the impact of external forces and uses.When sensor is subject to stretching strain, pulls element 5 movable and press element 6 because of the effect of directed element IV 14 and fixed support 2 and inertia.Pull element 5 to make travel(l)ing rest 1 movable and then make grating FBG 2 tension by directed element I 12, now grating FBG 1 not can be used as temperature compensation grating by the impact of external forces and uses.When this sensor is subject to compressive strain, responsive grating is FBG1, and temperature compensation grating is FBG2; When this sensor is subject to stretching strain, responsive grating is FBG2, and temperature compensation grating is FBG1.Such design not only can the cross sensitivity of compensation temperature and strain effectively, reduce the error of last result, and when this sensor is subject to stretching strain or compressive strain, the difference of responsive grating, not only can increase the serviceable life of sensor and what increase its range ability but also significantly can demonstrate that testee is subject to is pulling force or pressure.
Claims (6)
1. a surface-mount type fiber grating strain meter, it is characterized in that: comprise travel(l)ing rest, fixed support, shell, fairlead, pull element, press element, Transmission Fibers and drive link, described shell the same side is provided with two fairleads, described fixed support is fixedly connected with shell, described travel(l)ing rest is flexibly connected with shell, described drive link is successively through the first side wall of shell, travel(l)ing rest, second sidewall of fixed support and shell, drive link comprises inner and outer tubes, interior pipe end with press element and be connected, outer tube end is connected with pulling element, the same side of described outer tube is provided with directed element I, directed element II and quantitative journey element I, the same side of described interior pipe is connected with directed element III, directed element IV and quantitative journey element II, described Transmission Fibers is introduced from a fairlead of shell, successively through first hole and support bracket fastened first hole of travel(l)ing rest, then wraparound is through second hole of support bracket fastened second hole, travel(l)ing rest, and draw from another fairlead of shell, described Transmission Fibers is provided with measurement grating,
Described pulling element and press element is rectangular block, and on rectangular block, be provided with threaded hole and groove, and described groove coordinates with drive link; Described pulling element and press element is fixed on testee by screw;
The inner side of the first side wall apart from shell is located at by described quantitative journey element I, and distance is d
2=7860*D; Wherein D is the distance between travel(l)ing rest and fixed support;
Described quantitative journey element II is located between fixed support and shell second sidewall, and is d apart from support bracket fastened distance
1=7860*D; Wherein D is the distance between travel(l)ing rest and fixed support.
2. a kind of surface-mount type fiber grating strain meter as claimed in claim 1, is characterized in that: described Transmission Fibers is also provided with temperature compensation grating.
3. a kind of surface-mount type fiber grating strain meter as claimed in claim 1, is characterized in that: described housing first sidewall and shell second sidewall are two opposition parallel surfaces.
4. a kind of surface-mount type fiber grating strain meter as claimed in claim 1, is characterized in that: described directed element I and directed element III are close to travel(l)ing rest and arrange, and described directed element II and directed element IV are close to fixed support and arrange.
5. a kind of surface-mount type fiber grating strain meter as claimed in claim 1, is characterized in that: described inner and outer tubes are plugged in together, and outer tube wall has groove.
6. a kind of surface-mount type fiber grating strain meter as claimed in claim 1, is characterized in that: described directed element I, directed element II, directed element III, directed element IV, quantitatively journey element I, quantitatively journey element II are rectangular block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210488840.8A CN102997860B (en) | 2012-11-26 | 2012-11-26 | Surface-mounted fiber bragg grating strain gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210488840.8A CN102997860B (en) | 2012-11-26 | 2012-11-26 | Surface-mounted fiber bragg grating strain gauge |
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| Publication Number | Publication Date |
|---|---|
| CN102997860A CN102997860A (en) | 2013-03-27 |
| CN102997860B true CN102997860B (en) | 2015-05-20 |
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| CN201210488840.8A Expired - Fee Related CN102997860B (en) | 2012-11-26 | 2012-11-26 | Surface-mounted fiber bragg grating strain gauge |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104596436B (en) * | 2015-01-12 | 2018-05-01 | 武汉理工大学 | Magnetic-type fiber Bragg grating strain sensor pastes fixing device and method |
| WO2016182430A1 (en) | 2015-05-08 | 2016-11-17 | Fugro Technology B.V. | Sensor system and method for monitoring a powertrain |
| CN109373925B (en) * | 2018-12-21 | 2021-06-01 | 中国科学院武汉岩土力学研究所 | Large deformation testing device and method based on small strain of optical fiber |
| CN110823120B (en) * | 2019-12-13 | 2020-08-14 | 大连理工大学 | Compensation method for measurement error of surface-mounted fiber grating strain sensor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201707036U (en) * | 2010-07-02 | 2011-01-12 | 黄晓军 | Differential type fiber grating strain transducer |
| CN102175157A (en) * | 2011-01-18 | 2011-09-07 | 燕山大学 | Dual-range stay wire type fiber bragg grating displacement sensor |
| CN202974201U (en) * | 2012-11-26 | 2013-06-05 | 山东大学 | Surface mount type fiber bragg grating strain gauge |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2854689B1 (en) * | 2003-05-07 | 2005-09-02 | Commissariat Energie Atomique | DEVICE, SYSTEM AND METHOD FOR MEASURING MECHANICAL AND / OR THERMAL UNIAXIAL DEFORMATIONS USING A BRAGG NETWORK OPTICAL FIBER |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201707036U (en) * | 2010-07-02 | 2011-01-12 | 黄晓军 | Differential type fiber grating strain transducer |
| CN102175157A (en) * | 2011-01-18 | 2011-09-07 | 燕山大学 | Dual-range stay wire type fiber bragg grating displacement sensor |
| CN202974201U (en) * | 2012-11-26 | 2013-06-05 | 山东大学 | Surface mount type fiber bragg grating strain gauge |
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| CN102997860A (en) | 2013-03-27 |
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Granted publication date: 20150520 Termination date: 20151126 |