CN102072787A - Temperature self-compensated fiber grating tension sensor - Google Patents
Temperature self-compensated fiber grating tension sensor Download PDFInfo
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- CN102072787A CN102072787A CN 201010526107 CN201010526107A CN102072787A CN 102072787 A CN102072787 A CN 102072787A CN 201010526107 CN201010526107 CN 201010526107 CN 201010526107 A CN201010526107 A CN 201010526107A CN 102072787 A CN102072787 A CN 102072787A
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- extension rod
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Abstract
The invention relates to a temperature self-compensated fiber grating tension sensor comprising a base, wherein a cantilever is arranged on a cantilever mounting station of an inner cavity of the base through a fixed briquetting; a wire rope mounting hole is arranged at a position symmetric with the top end of the cantilever; a bearing is fixed through a cross shaft in the inner cavity of the base below a free end of the cantilever; a wire rope rounds the bearing from the wire rope mounting hole and is fixed at one end of a spring; the other end of the spring is fixed on an extension rod which is arranged in a sleeve of the extension rod; the external thread end of the extension rod is stretched out of the base; an optical fiber etched with a first fiber grating and a second fiber grating is arranged through an entrance of the optical fiber, the cantilever and an exit of the optical fiber; and the first fiber grating and the second fiber grating are arranged along the symmetric positions on the cantilever closely. The temperature self-compensating fiber grating tension sensor can realize a comprehensive test of tension and pressure in a static state and a dynamic state, in the meantime can resist electromagnetic interference and has a temperature self-compensating function.
Description
Technical field
The present invention relates to the engineering measurer, particularly a kind of fiber grating pulling force sensor of temperature self-compensation.
Background technology
At present, for example strain of various force transducers, piezoelectric type are widely used in the force measurement.Force measurement comprises static force measurement and dynamic force measurement, it mainly is to use strain gauge transducer that static force is measured, it can monitor to a certain static force value for a long time that still owing to the limitation of foil gauge dynamic response, it is not suitable for dynamic force measurement; The piezoelectric type force transducer then has higher Dynamic response, therefore is suitable for dynamic force measurement, but owing to the quantity of electric charge can't be stored for a long time, so the piezoelectric type sensor is not suitable for static force measurement.Simultaneously, because electronic sensor self exists anti-thunderbolt poor performance, anti-electromagnetic interference performance is poor, measuring distance is nearer defective, so caused poor reliability, measurement range is little, measuring accuracy is not high problem.
Fiber Bragg Grating technology originates from the seventies in last century, and the nineties enters China.At present domestic have how tame research institution to begin to utilize this technology to carry out parameter testing or making product.For the force transducer that needs under the particular surroundingss such as Aeronautics and Astronautics and petroleum industry to use, be characterized in having the higher dynamic response and the linearity measured of static force value preferably, also to have anti-electromagnetic interference (EMI) and preferably temperature float characteristic.
Summary of the invention
The defective that purpose of the present invention exists at above-mentioned prior art just, a kind of fiber grating pulling force sensor of temperature self-compensation is provided, its objective is and realize integration test static and dynamic pressure, can resist electromagnetic interference (EMI) and have the temperature self-compensation function simultaneously.
The objective of the invention is to realize by following measure:
A kind of temperature self-compensation fiber grating pulling force sensor, its characteristics are: comprise pedestal, this pedestal has an internal cavity, the semi-girder erecting bed that it is the inclined-plane that one end of this internal cavity is provided with an end face, this pedestal is provided with the optical fiber inlet by the top of the axis of an end of described semi-girder erecting bed, axis direction at the described pedestal in described semi-girder erecting bed lower edge is provided with through hole and an extension rod sleeve is set, the other end at pedestal is provided with optical fiber outlet and pedestal fixing threaded hole, on the inclined-plane of described semi-girder erecting bed by one fixedly briquetting stick up and establish a semi-girder, this semi-girder is a second order thickness isosceles triangle semi-girder, symmetric position on the top of the isosceles triangle of this semi-girder has a steel cable mounting hole, in the internal cavity at described pedestal below the free end of described semi-girder, fix a bearing by a transverse axis, article one, steel cable is fixed on an end of described spring after described steel cable mounting hole is walked around described bearing, the other end of this spring is fixed on the extension rod, this extension rod places described extension rod sleeve and the male end of extension rod is stretched out outside described pedestal, one optical fiber that is carved with first fiber grating and second fiber grating enters the mouth through described optical fiber, semi-girder to described optical fiber outlet is provided with, and described first fiber grating and second fiber grating are sticked along the symmetric position on the described semi-girder.
The structure of described second order thickness isosceles triangle semi-girder is that the orthogonal projection of this semi-girder is isosceles triangle, and the thickness of beam is the second order stepped appearance and distributes, promptly described isosceles triangle in the hang down thickness of section be respectively h
1And h
r, the thickness that described first fiber grating and second fiber grating are sticked respectively at second order thickness isosceles triangle semi-girder is h
1And h
rTwo-part symmetric position.
Also have the pulling force fixture, an end of this pulling force fixture has an internal thread hole, and to be connected with the male end of described extension rod, the other end has the pulling force connecting hole, and this pulling force connecting hole is for the connection of tensile elements to be measured.
Also has outer extension rod, an end that is somebody's turn to do outer extension rod has internal thread hole, the other end is a male end, and this outer extension rod internal thread hole is connected coupling with the male end of described extension rod, and the internal thread hole of outer extension rod male end and described pulling force fixture is complementary.
Angle between the axis of described semi-girder and described pedestal is 0 °～20 °.
Technique effect of the present invention is as follows:
The present invention realizes the accurate measurement of pulling force that spring is subjected to the strain measurement of semi-girder by fiber grating, the design by semi-girder realizes temperature self-compensation.It is to warble for the modulation of grating can not produced that described semi-girder is designed to isosceles triangle, and the stepped ramp type that is designed to second order thickness is in order to realize temperature self-compensation.
Grating fibers itself has strong, the measuring distance advantage far away of good, the anti-electromagnetic interference performance of anti-thunderbolt performance, so the present invention has good reliability, measurement range is big, measuring accuracy is high characteristics.
Description of drawings
Fig. 1 is a temperature self-compensation fiber grating pulling force sensor master cut-open view of the present invention;
Fig. 2 is the vertical view of temperature self-compensation fiber grating pulling force sensor of the present invention;
Fig. 3 is the matching used outer extension rod synoptic diagram of the present invention;
Fig. 4 is the matching used pulling force fixture of a present invention synoptic diagram;
Fig. 5 is the matching used holder synoptic diagram of the present invention;
Fig. 6 is the synoptic diagram of the second order ladder semi-girder of temperature self-compensation fiber grating pulling force sensor of the present invention.
Among the figure: the 1-pedestal, 2-optical fiber inlet, the 3-fixing threaded hole, the outlet of 4-optical fiber, 5-is briquetting fixedly, the 6-semi-girder, the 7-axle, the 8-bearing, 9-extension rod sleeve, the 10-extension rod, 11-extension rod male end, 12-optical fiber, the 13-steel cable, the 14-spring, the outlet of 15-spring, 16-first fiber grating, 17-second fiber grating, 18-semi-girder erecting bed, 19-steel cable mounting hole, the outer extension rod male end of 21-, the outer extension rod internal thread hole of 22-, the internal thread hole of 31-pulling force fixture, 32-pulling force connecting hole, 41-holder male end, 42-holder fixed orifice.
Embodiment
The present invention will be further described below in conjunction with the drawings and specific embodiments, is not divided into but should not limit protection of the present invention.
See also Fig. 1 and Fig. 2 earlier, as seen from the figure, temperature self-compensation fiber grating pulling force sensor of the present invention, comprise pedestal 1, this pedestal 1 has an internal cavity, the semi-girder erecting bed 18 that it is the inclined-plane that one end of this internal cavity is provided with an end face, this pedestal 1 is provided with optical fiber inlet 2 by the top of the axis of an end of described semi-girder erecting bed 18, axis direction at the described pedestal 1 in described semi-girder erecting bed lower edge is provided with through hole 15 and an extension rod sleeve 9 is set, the other end at pedestal 1 is provided with optical fiber outlet 4 and pedestal fixing threaded hole 3, on the inclined-plane of described semi-girder erecting bed 18 by one fixedly briquetting 5 stick up and establish a semi-girder 6, this semi-girder 6 is second order thickness isosceles triangle semi-girders, symmetric position on the top of the isosceles triangle of this semi-girder 6 has a steel cable mounting hole 19, in the internal cavity of described pedestal 1, fixing a bearing 8 below the free end of described semi-girder 6 by a transverse axis 7, article one, steel cable 13 is fixed on an end of described spring 14 after described steel cable mounting hole 19 is walked around described bearing 8, the other end of this spring 14 is fixed on the extension rod 10, this extension rod 10 places described extension rod sleeve 9 and the male end 11 of extension rod 10 is stretched out outside described pedestal 1, one is carved with the optical fiber 12 of first fiber grating 16 and second fiber grating 17 through described optical fiber inlet 2, semi-girder 6 to described optical fiber outlet 4 is provided with, and described first fiber grating 16 and second fiber grating 17 are sticked along the symmetric position on the described semi-girder 6.
The structure of described second order thickness isosceles triangle semi-girder is that the orthogonal projection of this semi-girder is isosceles triangle, and the thickness of beam is the second order stepped appearance and distributes, promptly described isosceles triangle in the hang down thickness of section be respectively h
1And h
r, the thickness that described first fiber grating 16 and second fiber grating 7 are sticked respectively at second order thickness isosceles triangle semi-girder is h
1And h
rTwo-part symmetric position.
Fig. 3 is the matching used outer extension rod synoptic diagram of the present invention, an end that is somebody's turn to do outer extension rod has internal thread hole 22, the other end is a male end 21, should be connected coupling with the male end 11 of described extension rod 10 by outer extension rod internal thread hole 22, outer extension rod male end 21 is complementary with the internal thread hole 31 of described pulling force fixture.
Fig. 4 is the matching used pulling force fixture of a present invention synoptic diagram, one end of this pulling force fixture has an internal thread hole 31, be connected with the male end with described extension rod 10, the other end has pulling force connecting hole 32, and this pulling force connecting hole 32 is for the connection of tensile elements to be measured.
Angle between the axis of described semi-girder and described pedestal is 0 °～20 °.
Equally, the present invention also can use as accessories such as universal joints by supporting other.
Fig. 5 is the matching used holder synoptic diagram of the present invention, the male end 41 of holder is used for connecting fiber grating pulling force sensor internal thread hole 3, the fixed orifice 42 of holder is fixed on fiber grating pulling force sensor of the present invention in the place of setting for the fixing holder of the present invention of user.
See also Fig. 6, Fig. 6 is the synoptic diagram of the second order ladder semi-girder of temperature self-compensation fiber grating pulling force sensor of the present invention.It is to warble for the modulation of grating can not produced that semi-girder 6 is designed to isosceles triangle, is in order to realize temperature self-compensation and be designed to stepped ramp type.These 2 have calculation specifications hereinafter.
Strain causes wave length shift by grating constant and the elasto-optical effect that influences fiber grating, temperature is then because heat rises and thermo-optic effect makes bragg reflection wavelength change, for homogeneous, uniform thickness, isoceles triangle shape semi-girder, axial stress is evenly distributed, and both can be expressed as respectively total contribution of optic fiber grating wavelength drift:
In the formula: ε
xBe axial strain, Δ T is the temperature difference; p
eBe effective elasto-optical coefficient, α and ξ are respectively the thermal expansivity and the thermo-optical coeffecient of optical fiber.
When semi-girder is designed to as shown in Figure 6 second order isosceles triangle semi-girder, among the figure: boundary line AB is the separatrix of semi-girder thickness, and the distance of boundary line AB and semi-girder stiff end is a, with free end Q distance be b.The upper surface coplane of the and arranged on left and right sides of boundary line AB, thickness of two sides is respectively h
1And h
rFirst fiber grating 16 of certain-length and second fiber grating 17 rigidity vertically are pasted on both sides, upper surface AB boundary line, the equal in length of the fiber grating of both sides, AB boundary line, to guarantee that both sides optical grating reflection spectrum peak is near equating that θ is 1/2nd drift angles of semi-girder in the measuring process.
If the Young modulus of material is E, free end is P perpendicular to the pressure on surface, and ω (b) is the angular displacement that is produced behind the stressed P of free end Q point, the difference Δ λ of the wavelength shift of first fiber grating 16 and second fiber grating 17
Br1Can derive and with following formula express [referring to document: Yu Youlong, Tan Huayao, Liao Xinyi, bell Yongkang, Guan Baiou. fiber grating displacement sensor free from temperature influence. optics journal, 2000,20 (4): 539～542]:
By formula as can be seen, any time, the difference Δ λ of the wavelength shift of first fiber grating 16 and second fiber grating 17
Br1All with the stressed P of free end Q point of second order isosceles triangle semi-girder after the angular displacement ω (b) that produced be directly proportional, irrelevant with environment temperature.The pulling force sensor of different ranges can be realized by the spring 14 of changing different elasticity coefficient and the semi-girder 6 of changing different-thickness or material.
The present invention is not because the pulling force that is born of spring 14 is directly proportional with the wavelength shift of fiber grating, certain functional relation is arranged, so the correction function curve of spring tension and optic fiber grating wavelength drift value need be provided to the user before dispatching from the factory, the correction function curve can be by being connected with apparatus of the present invention with the standard tension meter, the standard tension meter is applied one from 0 external force to maximum range of the present invention, apparatus of the present invention are connected with fiber Bragg grating (FBG) demodulator simultaneously, demodulation records the optic fiber grating wavelength drift value, resulting optic fiber grating wavelength drift value is corresponding with externally applied forces, just can obtain the calibration curve of spring tension-optic fiber grating wavelength drift value difference.
Principle of work of the present invention: as shown in Figure 1, spring 14 links to each other with wire rope 13, spring 14 is subjected to pulling force under external force, exert all one's strength by wire rope 13 and bearing 8 and to act on the semi-girder 6, semi-girder 6 occurs bending and deformation under the effect of external force, first fiber grating 16 and second fiber grating 17 are subjected to strain, produce wavelength variations, reach the fiber grating analyser by optical fiber, obtain wavelength shift poor of first fiber grating 16 and second fiber grating 17, calibration curve according to the pulling force that provides-optic fiber grating wavelength drift value difference carries out interpolation, thereby realizes the measurement of pulling force.
Our experiments show that, temperature self-compensation fiber grating pulling force sensor of the present invention can be realized integration test static and dynamic pressure, has the temperature self-compensation function simultaneously, and have that good, the anti-electromagnetic interference performance of anti-thunderbolt performance is strong, measuring distance is far away, good reliability, measurement range is big, measuring accuracy is high advantage, also have the flexible expansion of different ranges in addition.
Above-described embodiment, the present invention embodiment a kind of more preferably just, the common variation that those skilled in the art carries out in technical scheme scope of the present invention and replacing all should be included in protection scope of the present invention.
Claims (5)
1. temperature self-compensation fiber grating pulling force sensor, it is characterized in that: comprise pedestal (1), this pedestal (1) has an internal cavity, the semi-girder erecting bed (18) that it is the inclined-plane that one end of this internal cavity is provided with an end face, this pedestal (1) is provided with optical fiber inlet (2) by the top of the axis of an end of described semi-girder erecting bed (18), axis direction at the described pedestal in described semi-girder erecting bed lower edge (1) is provided with through hole (15) and an extension rod sleeve (9) is set, the other end at pedestal (1) is provided with optical fiber outlet (4) and pedestal fixing threaded hole (3), on the inclined-plane of described semi-girder erecting bed (18) by one fixedly briquetting (5) stick up and establish a semi-girder (6), this semi-girder (6) is a second order thickness isosceles triangle semi-girder, symmetric position on the top of the isosceles triangle of this semi-girder (6) has a steel cable mounting hole (19), a bearing (8) is fixed by a transverse axis (7) in free end below at described semi-girder (6) in the internal cavity of described pedestal (1), article one, steel cable (13) is fixed on an end of described spring (14) after described steel cable mounting hole (19) is walked around described bearing (8), the other end of this spring (14) is fixed on the extension rod (10), this extension rod (10) places described extension rod sleeve (9) and the male end (11) of extension rod (10) is stretched out outside described pedestal (1), one optical fiber (12) that is carved with first fiber grating (16) and second fiber grating (17) is through described optical fiber enter the mouth (2), semi-girder (6) to described optical fiber outlet (4) is provided with, and described first fiber grating (16) and second fiber grating (17) are sticked along the symmetric position on the described semi-girder (6).
2. temperature self-compensation fiber grating pulling force sensor according to claim 1, it is characterized in that: the structure of described second order thickness isosceles triangle semi-girder is that the orthogonal projection of this semi-girder is isosceles triangle, and the thickness of beam is the second order stepped appearance and distributes, promptly described isosceles triangle in the hang down thickness of section be respectively h
1And h
r, the thickness that described first fiber grating (16) and second fiber grating (17) are sticked respectively at second order thickness isosceles triangle semi-girder is h
1And h
rTwo-part symmetric position.
3. temperature self-compensation fiber grating pulling force sensor according to claim 1, it is characterized in that pulling force fixture in addition, one end of this pulling force fixture has an internal thread hole (31), be connected with male end with described extension rod (10), the other end has pulling force connecting hole (32), and this pulling force connecting hole (32) is for the connection of tensile elements to be measured.
4. temperature self-compensation fiber grating pulling force sensor according to claim 1, it is characterized in that outer extension rod in addition, an end that is somebody's turn to do outer extension rod has internal thread hole (22), the other end is male end (21), should be connected coupling with the male end (11) of described extension rod (10) by outer extension rod internal thread hole (22), outer extension rod male end (21) is complementary with the internal thread hole (31) of described pulling force fixture.
5. according to the fiber grating pulling force sensor of each described temperature self-compensation of claim 1 to 4, it is characterized in that the angle between the axis of described semi-girder and described pedestal is 0 °～20 °.
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| CN 201010526107 CN102072787A (en) | 2010-10-29 | 2010-10-29 | Temperature self-compensated fiber grating tension sensor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878937A (en) * | 2012-09-29 | 2013-01-16 | 无锡市政设计研究院有限公司 | Integrated displacement and angle sensor with fiber Bragg gratings |
| CN106840042A (en) * | 2015-12-04 | 2017-06-13 | 中国航空工业第六八研究所 | A kind of angular displacement sensor based on fiber grating |
| CN107131833A (en) * | 2017-04-28 | 2017-09-05 | 徐梦雪 | The distributed high precision optical fiber grating displacement transducer with temperature-compensating and method |
| CN107631701A (en) * | 2017-09-04 | 2018-01-26 | 东华大学 | A kind of fiber optical grating intelligent angular instrument based on 3D printing technique |
| CN109282933A (en) * | 2018-10-12 | 2019-01-29 | 柳州欧维姆结构检测技术有限公司 | A kind of sensitizing type temperature self-compensation dynamometry ring sensor |
| CN109470403A (en) * | 2018-12-14 | 2019-03-15 | 北京航空航天大学 | A kind of power based on fiber grating/torque sensor scaling method |
| CN113624324A (en) * | 2021-08-09 | 2021-11-09 | 西安石油大学 | Hollow triangle beam type fiber grating vibration sensor |
| US11796310B1 (en) * | 2022-06-10 | 2023-10-24 | University Of Macau | Fiber Bragg grating displacement sensor with positive and negative bidirectional measurement and free from vibration |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878937A (en) * | 2012-09-29 | 2013-01-16 | 无锡市政设计研究院有限公司 | Integrated displacement and angle sensor with fiber Bragg gratings |
| CN106840042A (en) * | 2015-12-04 | 2017-06-13 | 中国航空工业第六八研究所 | A kind of angular displacement sensor based on fiber grating |
| CN107131833A (en) * | 2017-04-28 | 2017-09-05 | 徐梦雪 | The distributed high precision optical fiber grating displacement transducer with temperature-compensating and method |
| CN107131833B (en) * | 2017-04-28 | 2019-05-17 | 徐梦雪 | High precision optical fiber grating displacement sensor and method of the distribution with temperature-compensating |
| CN107631701A (en) * | 2017-09-04 | 2018-01-26 | 东华大学 | A kind of fiber optical grating intelligent angular instrument based on 3D printing technique |
| CN109282933A (en) * | 2018-10-12 | 2019-01-29 | 柳州欧维姆结构检测技术有限公司 | A kind of sensitizing type temperature self-compensation dynamometry ring sensor |
| CN109470403A (en) * | 2018-12-14 | 2019-03-15 | 北京航空航天大学 | A kind of power based on fiber grating/torque sensor scaling method |
| CN113624324A (en) * | 2021-08-09 | 2021-11-09 | 西安石油大学 | Hollow triangle beam type fiber grating vibration sensor |
| CN113624324B (en) * | 2021-08-09 | 2023-10-13 | 西安石油大学 | Hollow triangle beam type fiber bragg grating vibration sensor |
| US11796310B1 (en) * | 2022-06-10 | 2023-10-24 | University Of Macau | Fiber Bragg grating displacement sensor with positive and negative bidirectional measurement and free from vibration |
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Application publication date: 20110525 |