CN202869443U - Integrated displacement and rotation angle sensor with fiber Bragg gratings - Google Patents
Integrated displacement and rotation angle sensor with fiber Bragg gratings Download PDFInfo
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- CN202869443U CN202869443U CN 201220511572 CN201220511572U CN202869443U CN 202869443 U CN202869443 U CN 202869443U CN 201220511572 CN201220511572 CN 201220511572 CN 201220511572 U CN201220511572 U CN 201220511572U CN 202869443 U CN202869443 U CN 202869443U
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- optical fiber
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Abstract
The utility model relates to an integrated displacement and rotation angle sensor with fiber Bragg gratings, belonging to the field of sensing technology. The integrated displacement and rotation angle sensor is particularly used for detecting structural health in civil engineering. The integrated displacement and rotation angle sensor comprises a circular shaft, a bearing, a hinge pin, a spiral shaft, a first stay wire, a shell, a supporting rod, a constant-strength beam, a first fiber Bragg grating, a spring, a cushion block, a protective tube, a first tail fiber, a connecting rod, a second fiber Bragg grating, a second tail fiber and a second stay wire. The supporting rod is in contact with a side surface of the spiral shaft, the first fiber Bragg grating and the second fiber Bragg grating are respectively symmetrically adhered on the upper surface and the lower surface of the constant-strength beam, and the circular shaft is fixed to one side of the spiral shaft. The integrated displacement and rotation angle sensor is simple, compact and reasonable in structure, the shortcoming that fiber Bragg gratings can be easily damaged and are affected by temperature is overcome, large-scale measurement can be realized, and any angular displacement within the range of +/-180 degrees can be measured by the spiral shaft structure.
Description
Technical field
The utility model relates to a kind of fiber grating displacement corner integrated transducer, specifically for detection of structural health situation in the civil engineering work, belongs to field of sensing technologies.
Background technology
In civil engineering work, monitoring structural health conditions (SHM) has great importance to the long-term safety operation that guarantees civil structure.And displacement and roll angle inspection are measure the items the most basic in the monitoring structural health conditions, and displacement detecting can adopt displacement transducer, and roll angle inspection can adopt inclinator or angular displacement sensor.Traditional displacement transducer, inclinator or angular displacement sensor are based on electric class and measure sensing technology, such as resistance strain gage, string wire meter etc., owing to their poor durability, can't satisfy the long term monitoring of civil structure.
Fiber-optic grating sensor is a kind of Smart Sensor, and its moisture resistance, anti-corruption, permanance are strong, can under rugged surroundings, work, and good reliability, strong interference immunity, and easily consist of sensing network.Fiber-optic grating sensor has obtained the extensive concern in the world because have these advantages.Fiber-optic grating sensor is applied in the measurement of the multiple physical quantitys such as temperature, strain, pressure, displacement, acceleration, flow in the world at present.
Existing fiber grating displacement sensor exists range little, and is fragile or do not consider the shortcomings such as temperature effect.Be that 200510047350.4 " a kind of fiber grating displacement sensor " is to utilize the stretching of spring to make the fiber Bragg grating strain sensor of steel pipe encapsulation be out of shape to measure change in displacement such as the patent No..This invention is simple in structure, but reckons without the impact of temperature factor.And for example the patent No. is that 200810201667.2 " a kind of stay-supported optical fiber grating displacement sensor " is the measurement that effect of stress is realized displacement at the measurement grating by wheel hub, gear.The impact of temperature factor is considered in this invention, carries temperature compensation, but because fiber grating does not have cling matrix and directly stressed, easily fibercuts occurs and destroy under larger External Force Acting.The patent No. is that 201010127525.3 " ultra-precise fiber grating displacement sensor " is that fiber grating is laid in the measuring staff two ends for another example, when transducer probe assembly is subjected to displacement, fiber grating will be stretched, wherein the cardiac wave long hair is given birth to respective change, obtain displacement by the test wavelength variable quantity, this invention has very high resolution and displacement accuracy, but range is less, be 50um, and do not consider the impact of temperature factor.
There are the shortcomings such as measurement range is little, easy damage in the existing optical fiber grating inclination angle sensor that can be used for measuring corner.Be that 200410009719.8 " a kind of fiber grating inclination angular transducer " utilizes the gravity of gravity pendulum that two gratings that are pasted on the uniform beam are deformed such as the patent No., be used for measuring tilt variation, but range be less, only is 2-8 °.And for example the patent No. be 200310113187.8 " optical fiber grating inclination angle sensor " and the patent No. be " novel fiber grating two-dimensional tilting angle sensor " invention of 200910097186.6 because fiber grating does not have cling matrix directly stressed, easily fibercuts occurs and destroy under larger External Force Acting.
And for fiber grating displacement and the integrated sensor of corner are had not yet to see.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned weak point, thereby provide that a kind of endurance quality is good, measuring accuracy is high, measurement range greatly, temperature influence not, and fiber grating displacement corner integrated transducer simple in structure, as not to be subjected to the interference of electromagnetic field utilizes fiber grating to carry out displacement and roll angle inspection.
The technical scheme that provides according to the utility model; fiber grating displacement corner integrated transducer comprises circular shaft, bearing, bearing pin, screw axis, the first backguy, housing, pole, the beam of uniform strength, the first fiber grating, spring, cushion block, protection tube, the first tail optical fiber, connecting link, the second fiber grating, the second tail optical fiber and the second backguy; it is characterized in that: housing one side fixed pin shaft; bearing set on the bearing pin is set with screw axis on the bearing.The interior fixedly cushion block of housing, the beam of uniform strength one end is fixed by screws on the cushion block, and the other end is pole fixedly.Described pole and screw axis contacts side surfaces.Described beam of uniform strength upper and lower surface is symmetrical the first fiber grating, the second fiber grating pasted respectively.The first tail optical fiber, the second tail optical fiber stick on respectively the upper and lower surface of the beam of uniform strength.Described the first tail optical fiber is connected with the first fiber grating, and the second tail optical fiber is connected with the second fiber grating.Described screw axis one side is circular shaft fixedly, circular shaft side fixed connecting rod.The interior fixedly protection tube of housing, mounting spring in the protection tube.One end of described spring connects the first backguy, and one of the first backguy closely is wrapped on the circular shaft.The other end of spring connects the second backguy.
The outline curve of described screw axis is spiral of Archimedes.
Described bearing pin is vertical with pole.Described pole is vertical with the beam of uniform strength.Described the second backguy passes housing.Described the first tail optical fiber passes housing.Described the second tail optical fiber passes housing.Described circular shaft is coaxial with screw axis.Described connecting link passes housing.
Compared with the prior art the utility model has the following advantages:
The utility model is simple, compact and reasonable for structure; The fiber grating symmetry is sticked on the upper and lower surface of the beam of uniform strength, overcome fiber grating fragile, the shortcoming of temperature influence; And increased spring, can realize measurement in a big way; Utilized screw shaft structure can measure ± 180o is with interior any angular displacement.
Description of drawings
Fig. 1 is the utility model front view.
Fig. 2 is the utility model vertical view.
Description of reference numerals: 1-circular shaft, 2-bearing, 3-bearing pin, 4-screw axis, 5-the first backguy, 6-housing, 7-pole, the 8-beam of uniform strength, 9-the first fiber grating, 10-spring, 11-cushion block, 12-protection tube, 13-the first tail optical fiber, 14-connecting link, 15-the second fiber grating, 16-the second tail optical fiber, 17-the second backguy.
Embodiment
Following the utility model is further described in connection with the embodiment in the accompanying drawing:
Shown in Fig. 1 ~ 2, the utility model mainly comprises circular shaft 1, bearing 2, bearing pin 3, screw axis 4,5-the first backguy 5, housing 6, pole 7, the beam of uniform strength 8, the first fiber grating 9, spring 10, cushion block 11, protection tube 12, the first tail optical fiber 13, connecting link 14, the second fiber grating 15, the second tail optical fiber 16 and the second backguy 17.
Housing 6 one side fixed pin shafts 3, bearing set 2 on the bearing pin 3, suit screw axis 4 on the bearing 2.Housing 6 interior fixedly cushion blocks 11.The described beam of uniform strength 8 one ends are fixed by screws on the cushion block 11, and the other end is pole 7 fixedly.Described pole 7 and screw axis 4 contacts side surfaces.The described beam of uniform strength 8 upper and lower surfaces are symmetrical the first fiber grating 9, the second fiber grating 15 pasted respectively.The first tail optical fiber 13, the second tail optical fiber 16 stick on respectively the upper and lower surface of the beam of uniform strength 8.Described the first tail optical fiber 13 is connected with the first fiber grating 9, and the second tail optical fiber 16 is connected with the second fiber grating 15.Described the first tail optical fiber 13 and the second tail optical fiber 16 pass housing 6.
Described screw axis 4 one sides are circular shaft 1 fixedly, and circular shaft 1 is coaxial with screw axis 4.Circular shaft 1 side fixed connecting rod 14.Described connecting link 14 passes housing 6.The outline curve of described screw axis 4 is spiral of Archimedes.
Housing 1 interior fixedly protection tube 12, protection tube 12 interior mounting spring 10.One end of described spring 10 connects 5 one of the first backguy 5, the first backguys and closely is wrapped on the circular shaft 1.The other end of spring 10 connects the second backguy 17, the second backguys 17 and passes housing 1.
Described bearing pin 3 is vertical with pole 7.Described pole 7 is vertical with the beam of uniform strength 8.
Principle of work of the present utility model is: during installation, with the first tail optical fiber 13 be connected tail optical fiber 16 and be connected with acquisition instrument, connecting link 14 is connected with external structure.When second backguy 17 of stretching out housing 6 was subjected to displacement, stretching occured and drives circular shaft 1 and screw axis 4 rotations in spring 10.The rotation of screw axis 4 promotes pole 7 and makes the beam of uniform strength 8 flexural deformations, symmetry the first fiber grating 9 of upper and lower surface and the second fiber grating 15 that stick on the beam of uniform strength 8 will produce cooperative transformation with the surface of the beam of uniform strength 8 like this, so that the centre wavelength of the first fiber grating 9 and the second fiber grating 15 skew certain owing to strain produces, can draw the centre wavelength of the first fiber grating 9 and the second fiber grating 15 and the relation between the second backguy 17 displacements by analyzing, thereby realize the detection of displacement.
When the external structure that is connected with connecting link 14 rotates angle, corresponding rotation occurs in circular shaft 1 and screw axis 4, the rotation of screw axis 4 promotes pole 7 and makes the beam of uniform strength 8 flexural deformations, symmetry the first fiber grating 9 of upper and lower surface and the second fiber grating 15 that stick on the beam of uniform strength 8 will produce cooperative transformation with the surface of the beam of uniform strength 8 like this, so that the centre wavelength of the first fiber grating 9 and the second fiber grating 15 skew certain owing to strain produces, can draw the centre wavelength of the first fiber grating 9 and the second fiber grating 15 and the relation between the external structure anglec of rotation by analyzing, thereby realize the detection of the anglec of rotation.
The utility model has the advantage of and utilize fiber grating to carry out displacement and roll angle inspection, fiber grating is a kind of strain sensor of function admirable, its antijamming capability is strong, be not subjected to the interference of electromagnetic field, also do not affect external electromagnetic field, electrical insulation capability is good, good endurance, measure highly sensitive, measuring accuracy is high, can realize point measurement and distributed measurement; The first fiber grating 9 and the second fiber grating 15 symmetries stick on the upper and lower surface of the beam of uniform strength, can improve measuring accuracy, and effectively eliminate the measuring error of being brought by temperature variation.The outer corner measurement scope is large, can measure ± 180o is with interior any angular displacement.In addition, the utility model is simple in structure, explosion-proof is good, is not subjected to the interference of electromagnetic field, can be widely used in the displacement and roll angle inspection of the abominable working environment such as civil engineering work, petrochemical complex.
Claims (9)
1. fiber grating displacement corner integrated transducer, comprise circular shaft (1), bearing (2), bearing pin (3), screw axis (4), the first backguy (5), housing (6), pole (7), the beam of uniform strength (8), the first fiber grating (9), spring (10), cushion block (11), protection tube (12), the first tail optical fiber (13), connecting link (14), the second fiber grating (15), the second tail optical fiber (16) and the second backguy (17), it is characterized in that: housing (6) one side fixed pin shafts (3), the upper bearing set (2) of bearing pin (3), the upper suit of bearing (2) screw axis (4); The interior fixedly cushion block (11) of housing (6), the beam of uniform strength (8) one ends are fixed by screws on the cushion block (11), and the other end is pole (7) fixedly; Described pole (7) and screw axis (4) contacts side surfaces; The described beam of uniform strength (8) upper and lower surface is symmetrical the first fiber grating (9), the second fiber grating (15) pasted respectively; The first tail optical fiber (13), the second tail optical fiber (16) stick on respectively the upper and lower surface of the beam of uniform strength (8); Described the first tail optical fiber (13) is connected with the first fiber grating (9), and the second tail optical fiber (16) is connected with the second fiber grating (15); Described screw axis (4) one sides are circular shaft (1) fixedly, circular shaft (1) side fixed connecting rod (14); The interior fixedly protection tube (12) of housing (1), the interior mounting spring of protection tube (12) (10); One end of described spring (10) connects the first backguy (5), and (5) one of the first backguys closely are wrapped on the circular shaft (1); The other end of spring (10) connects the second backguy (17).
2. fiber grating displacement corner integrated transducer as claimed in claim 1, it is characterized in that: the outline curve of described screw axis (4) is spiral of Archimedes.
3. fiber grating displacement corner integrated transducer as claimed in claim 1, it is characterized in that: described bearing pin (3) is vertical with pole (7).
4. fiber grating displacement corner integrated transducer as claimed in claim 1, it is characterized in that: described pole (7) is vertical with the beam of uniform strength (8).
5. fiber grating displacement corner integrated transducer as claimed in claim 1, it is characterized in that: described the second backguy (17) passes housing (1).
6. fiber grating displacement corner integrated transducer as claimed in claim 1, it is characterized in that: described the first tail optical fiber (13) passes housing (6).
7. fiber grating displacement corner integrated transducer as claimed in claim 1, it is characterized in that: described the second tail optical fiber (16) passes housing (6).
8. fiber grating displacement corner integrated transducer as claimed in claim 1, it is characterized in that: described circular shaft (1) is coaxial with screw axis (4).
9. fiber grating displacement corner integrated transducer as claimed in claim 1, it is characterized in that: described connecting link (14) passes housing (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220511572 CN202869443U (en) | 2012-09-29 | 2012-09-29 | Integrated displacement and rotation angle sensor with fiber Bragg gratings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220511572 CN202869443U (en) | 2012-09-29 | 2012-09-29 | Integrated displacement and rotation angle sensor with fiber Bragg gratings |
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| CN202869443U true CN202869443U (en) | 2013-04-10 |
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| CN 201220511572 Expired - Fee Related CN202869443U (en) | 2012-09-29 | 2012-09-29 | Integrated displacement and rotation angle sensor with fiber Bragg gratings |
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Cited By (3)
| 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 |
| CN111380486A (en) * | 2020-03-25 | 2020-07-07 | 北京航空航天大学 | High-resolution angular displacement measuring device and method for micro-thrust measurement |
| US20220228853A1 (en) * | 2021-01-15 | 2022-07-21 | Sun Yat-Sen University | Detection apparatus and method for flow deformation of foundation layer in horizontal direction |
-
2012
- 2012-09-29 CN CN 201220511572 patent/CN202869443U/en not_active Expired - Fee Related
Cited By (4)
| 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 |
| CN111380486A (en) * | 2020-03-25 | 2020-07-07 | 北京航空航天大学 | High-resolution angular displacement measuring device and method for micro-thrust measurement |
| US20220228853A1 (en) * | 2021-01-15 | 2022-07-21 | Sun Yat-Sen University | Detection apparatus and method for flow deformation of foundation layer in horizontal direction |
| US11549804B2 (en) * | 2021-01-15 | 2023-01-10 | Sun Yat-Sen University | Detection apparatus and method for flow deformation of foundation layer in horizontal direction |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20200929 |
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| CF01 | Termination of patent right due to non-payment of annual fee |