CN202075072U - Fiber Bragg grating type stick force sensor - Google Patents
Fiber Bragg grating type stick force sensor Download PDFInfo
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- CN202075072U CN202075072U CN2011200629049U CN201120062904U CN202075072U CN 202075072 U CN202075072 U CN 202075072U CN 2011200629049 U CN2011200629049 U CN 2011200629049U CN 201120062904 U CN201120062904 U CN 201120062904U CN 202075072 U CN202075072 U CN 202075072U
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- strain sensor
- grating strain
- optical
- fibre bragg
- optical fibre
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Abstract
The utility model relates to a fiber Bragg grating type stick force sensor, which is characterized in that a first fiber Bragg grating strain sensor and a second fiber Bragg grating strain sensor are adhered to the outer side of one relevant parallel beam, a fifth fiber Bragg grating strain sensor and a sixth fiber Bragg grating strain sensor are adhered to the other side of the relevant parallel beam, a third fiber Bragg grating strain sensor and the fourth fiber Bragg grating strain sensor are adhered to the outer side of the other relevant parallel beam, a seventh fiber Bragg grating strain sensor and the eighth fiber Bragg grating strain sensor are adhered to the other side of the other relevant parallel beam, the first fiber Bragg grating strain sensor, the third fiber Bragg grating strain sensor, the fifth fiber Bragg grating strain sensor and the seventh fiber Bragg grating strain sensor are connected in series, and the second fiber Bragg grating strain sensor, the fourth fiber Bragg grating strain sensor, the sixth fiber Bragg grating strain sensor and the eighth fiber Bragg grating strain sensor are connected in series.
Description
Technical field
The present invention relates to a kind of Fiber Bragg Grating FBG formula stick force sensor, can eliminate the influence of temperature on fiber Bragg grating sensor, and effectively improve the precision and the sensitivity of Fiber Bragg Grating FBG formula stick force sensor, belong to sensory field of optic fibre.
Background technology
Fiber Bragg grating sensor becomes the focus and the focus of sensor research gradually as a very important branch in the Fibre Optical Sensor.The sensor that utilizes the Fiber Bragg Grating FBG principle to make now has been widely used in physical quantitys such as measuring strain, temperature, pressure and liquid level, and the sensor that produces to have a volume little, the measuring accuracy height, anti-electromagnetic interference (EMI), corrosion-resistant, reliability and stability are good, advantages such as good endurance.
In the stick force sensor-based system, current mainstream technology is based on the mapping mode of resistance-strain type.By the sensor flexible member stick force load is transformed into surface strain,, converts the resistance variations of strain ga(u)ge the output of to curtage signal by electronic measurement technique again through strain ga(u)ge induction test strain.Though this resistance-strain type stick force sensor is well used, still there are some intrinsic defectives in measuring accuracy and reliability aspect.For example, in bigger serviceability temperature scope, the resistance value of strain ga(u)ge and the temperature stability of sensitivity coefficient are poor; The mechanical hysteresis effect of strainometer enlarges markedly under high-temperature condition; The strain limit of strainometer obviously descends with the rising of temperature.In electric detecting technology, though can adopt zero-bit technique for temperature compensations such as thermistor compensation, connection in series-parallel resnstance transformer and active circuit segmented compensation can reduce its zero-bit output drift within the specific limits, but because technology limitation, thisly can't reach very high precision and level of sensitivity based on resistance-strain type stick force sensor; Can not defend thunder and lightning, electromagnetic interference (EMI) and electromagnetic impact etc.
In view of the defective that the traditional rod force transducer exists, Fiber Bragg Grating FBG stick force sensor all exceeds much than traditional resistance strain type sensor at index parameters such as the stability of required measuring accuracy, dynamic response, anti-electromagnetic interference (EMI), total temperature and the output of air pressure range transducer zeroing and reliabilities.
But in the optical fiber Bragg grating sensing field, strain and temperature are two physical quantitys that can directly cause Fiber Bragg Grating FBG centre wavelength to produce drift, and promptly Fiber Bragg Grating FBG is to temperature and strain cross sensitivity.Because Fiber Bragg Grating FBG is all responsive to temperature and strain, when measuring strain, Temperature Influence is difficult to eliminate, thereby has limited its practical application; Simultaneously, the precision and the sensitivity of existing fiber Bragg grating sensor are relatively low, need further to improve.
Summary of the invention
The technical matters that solves
For fear of the deficiencies in the prior art part, the present invention proposes a kind of Fiber Bragg Grating FBG formula stick force sensor, can when measuring stick force, eliminate Temperature Influence, and the sensitivity that improves Fiber Bragg Grating FBG formula stick force sensor effectively, manufacture craft is simple, signal Processing is easy, has solved the problem of fiber Bragg grating sensor cross-sensitivity.
Technical scheme
A kind of Fiber Bragg Grating FBG formula stick force sensor, comprise first related parallel girder 1, the second related parallel girder 2, it is characterized in that, first optical fibre Bragg optical grating strain sensor 3 and second optical fibre Bragg optical grating strain sensor 4 stick on the outside of a beam in this association parallel girder 1 symmetrically along the axis of the first related parallel girder 1, opposite side is pasted the 5th optical fibre Bragg optical grating strain sensor 7 and six fibers Bragg optical grating strain sensor 8; The 3rd optical fibre Bragg optical grating strain sensor 5 and the 4th optical fibre Bragg optical grating strain sensor 6 stick on the outside of 2 one beams of this association parallel girder symmetrically along the axis of the second related parallel girder 2, and opposite side is pasted the 7th optical fibre Bragg optical grating strain sensor 9 and the 8th optical fibre Bragg optical grating strain sensor 10; First optical fibre Bragg optical grating strain sensor 3, the 3rd optical fibre Bragg optical grating strain sensor 5, the 5th optical fibre Bragg optical grating strain sensor 7 and the 7th optical fibre Bragg optical grating strain sensor 9 series connection; Second optical fibre Bragg optical grating strain sensor 4, the 4th optical fibre Bragg optical grating strain sensor 6, six fibers Bragg optical grating strain sensor 8 and the 8th optical fibre Bragg optical grating strain sensor 10 series connection.
Described the 3rd optical fibre Bragg optical grating strain sensor 3, the 4th optical fibre Bragg optical grating strain sensor 4, the 3rd optical fibre Bragg optical grating strain sensor 5, the 4th optical fibre Bragg optical grating strain sensor 6, the 5th optical fibre Bragg optical grating strain sensor 7, six fibers Bragg optical grating strain sensor 8, the 7th optical fibre Bragg optical grating strain sensor 9 and the 8th optical fibre Bragg optical grating strain sensor 10 are same material, have same structure and centre wavelength.
Described the 3rd optical fibre Bragg optical grating strain sensor 3, the 4th optical fibre Bragg optical grating strain sensor 4, the 3rd optical fibre Bragg optical grating strain sensor 5 and the 4th optical fibre Bragg optical grating strain sensor 6, the 5th optical fibre Bragg optical grating strain sensor 7, six fibers Bragg optical grating strain sensor 8, the 7th optical fibre Bragg optical grating strain sensor 9 and the 8th optical fibre Bragg optical grating strain sensor 10 are SMD fiber Bragg grating sensor or bare fibre Bragg grating sensor.
Beneficial effect
A kind of Fiber Bragg Grating FBG formula stick force sensor that the present invention proposes, unified and the measuring method of Department of Survey, can record the size of testing force apace, easily, and in the inner problem that solves temperature compensation of sensor-based system, and the method for utilizing two fiber Bragg grating strain sensor centre wavelength drift values to be averaged has improved the precision and the sensitivity of Fiber Bragg Grating FBG stick force sensor effectively.This Fiber Bragg Grating FBG formula stick force sensor has that anti-electromagnetic interference (EMI), precision height, dynamic response are fast, the little characteristics such as in light weight, simple in structure of volume, has more reliability, stability and simplification; This stick force sensor cost is cheap relatively in addition, is applicable to the comparison narrow space, can get rid of Temperature Influence, measures the stressed size of flexible member.
Description of drawings
Fig. 1: be Fiber Bragg Grating FBG formula stick force sensor construction synoptic diagram of the present invention
The 1-first related parallel girder; The 2-second related parallel girder; 3-first optical fibre Bragg optical grating strain sensor; 4-second optical fibre Bragg optical grating strain sensor; 5-the 3rd optical fibre Bragg optical grating strain sensor; 6-the 4th optical fibre Bragg optical grating strain sensor; 7-the 5th optical fibre Bragg optical grating strain sensor; 8-six fibers Bragg optical grating strain sensor; 9-the 7th optical fibre Bragg optical grating strain sensor; 10-the 8th optical fibre Bragg optical grating strain sensor; The 1-1-first related parallel girder face one; The 1-2-first related parallel girder face two; The 2-1-second related parallel girder face one; The 2-2-second related parallel girder face two.
Embodiment
Now in conjunction with the embodiments, accompanying drawing is further described the present invention:
Embodiment: accompanying drawing is a kind of Fiber Bragg Grating FBG formula stick force sensor, sticks on symmetrically on the axis parallel with rectangle hollow rectangle frame on the 1-1 face of the first related parallel girder 1 with second optical fibre Bragg optical grating strain sensor 4 comprising first related parallel girder 1, the second related parallel girder 2, first optical fibre Bragg optical grating strain sensor 3, second optical fibre Bragg optical grating strain sensor 4, the 3rd optical fibre Bragg optical grating strain sensor 5,6: the first optical fibre Bragg optical grating strain sensors 3 of the 4th optical fibre Bragg optical grating strain sensor; The 3rd optical fibre Bragg optical grating strain sensor 5 sticks on the axis parallel with rectangle hollow rectangle frame on the 2-1 face of the second related parallel girder 2 symmetrically with the 4th optical fibre Bragg optical grating strain sensor 6; First optical fibre Bragg optical grating strain sensor 3, the 3rd optical fibre Bragg optical grating strain sensor 5 series connection; Second optical fibre Bragg optical grating strain sensor 4, the 4th optical fibre Bragg optical grating strain sensor 6 series connection.Pasted the 5th optical fibre Bragg optical grating strain sensor 7, six fibers Bragg optical grating strain sensor 8, the 7th optical fibre Bragg optical grating strain sensor 9 and the 8th optical fibre Bragg optical grating strain sensor 10 on this basis again, its purpose is to improve the sensitivity of sensor.First optical fibre Bragg optical grating strain sensor 3 wherein, second optical fibre Bragg optical grating strain sensor 4, the 3rd optical fibre Bragg optical grating strain sensor 5, the 4th optical fibre Bragg optical grating strain sensor 6, the 5th optical fibre Bragg optical grating strain sensor 7, six fibers Bragg optical grating strain sensor 8, the 7th optical fibre Bragg optical grating strain sensor 9 and the 8th optical fibre Bragg optical grating strain sensor 10 are the bare fibre Bragg grating, and first optical fibre Bragg optical grating strain sensor 3, second optical fibre Bragg optical grating strain sensor 4 is identical bare fibre Bragg grating; The 3rd optical fibre Bragg optical grating strain sensor 5, the 4th optical fibre Bragg optical grating strain sensor 6 are identical bare fibre Bragg grating; The 5th optical fibre Bragg optical grating strain sensor 7, six fibers Bragg optical grating strain sensor 8 are identical bare fibre Bragg grating; The 7th optical fibre Bragg optical grating strain sensor 9 and the 8th optical fibre Bragg optical grating strain sensor 10 are identical bare fibre Bragg grating; But four pairs of Fiber Bragg Grating FBG materials are identical with structure, but centre wavelength difference.The 5th optical fibre Bragg optical grating strain sensor 7 sticks on the axis parallel with rectangle hollow rectangle frame on the 1-2 face of the first related parallel girder 1 symmetrically with six fibers Bragg optical grating strain sensor 8; The 7th optical fibre Bragg optical grating strain sensor 9 sticks on the axis parallel with rectangle hollow rectangle frame on the 2-2 face of the second related parallel girder 2 symmetrically with the 8th optical fibre Bragg optical grating strain sensor 10; First optical fibre Bragg optical grating strain sensor 3, the 3rd optical fibre Bragg optical grating strain sensor 5, the 5th optical fibre Bragg optical grating strain sensor 7 and the 7th optical fibre Bragg optical grating strain sensor 9 series connection; Second optical fibre Bragg optical grating strain sensor 4, the 4th optical fibre Bragg optical grating strain sensor 6, six fibers Bragg optical grating strain sensor 8 and the 8th optical fibre Bragg optical grating strain sensor 10 series connection.
Claims (3)
1. Fiber Bragg Grating FBG formula stick force sensor, comprise the first related parallel girder (1), the second related parallel girder (2), it is characterized in that, first optical fibre Bragg optical grating strain sensor (3) and second optical fibre Bragg optical grating strain sensor (4) stick on the outside of a beam in this association parallel girder (1) symmetrically along the axis of the first related parallel girder (1), opposite side is pasted the 5th optical fibre Bragg optical grating strain sensor (7) and six fibers Bragg optical grating strain sensor (8); The 3rd optical fibre Bragg optical grating strain sensor (5) and the 4th optical fibre Bragg optical grating strain sensor (6) stick on the outside of (2) beams of this association parallel girder symmetrically along the axis of the second related parallel girder (2), and opposite side is pasted the 7th optical fibre Bragg optical grating strain sensor (9) and the 8th optical fibre Bragg optical grating strain sensor (10); First optical fibre Bragg optical grating strain sensor (3), the 3rd optical fibre Bragg optical grating strain sensor (5), the 5th optical fibre Bragg optical grating strain sensor (7) and the 7th optical fibre Bragg optical grating strain sensor (9) series connection; Second optical fibre Bragg optical grating strain sensor (4), the 4th optical fibre Bragg optical grating strain sensor (6), six fibers Bragg optical grating strain sensor (8) and the 8th optical fibre Bragg optical grating strain sensor (10) series connection.
2. Fiber Bragg Grating FBG formula stick force sensor according to claim 1, it is characterized in that: described the 3rd optical fibre Bragg optical grating strain sensor (3), the 4th optical fibre Bragg optical grating strain sensor (4), the 3rd optical fibre Bragg optical grating strain sensor (5), the 4th optical fibre Bragg optical grating strain sensor (6), the 5th optical fibre Bragg optical grating strain sensor (7), six fibers Bragg optical grating strain sensor (8), the 7th optical fibre Bragg optical grating strain sensor (9) and the 8th optical fibre Bragg optical grating strain sensor (10) are same material, have same structure and centre wavelength.
3. Fiber Bragg Grating FBG formula stick force sensor according to claim 1 and 2 is characterized in that: described the 3rd optical fibre Bragg optical grating strain sensor (3), the 4th optical fibre Bragg optical grating strain sensor (4), the 3rd optical fibre Bragg optical grating strain sensor (5) and the 4th optical fibre Bragg optical grating strain sensor (6), the 5th optical fibre Bragg optical grating strain sensor (7), six fibers Bragg optical grating strain sensor (8), the 7th optical fibre Bragg optical grating strain sensor (9) and the 8th optical fibre Bragg optical grating strain sensor (10) are SMD fiber Bragg grating sensor or bare fibre Bragg grating sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200629049U CN202075072U (en) | 2011-03-10 | 2011-03-10 | Fiber Bragg grating type stick force sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200629049U CN202075072U (en) | 2011-03-10 | 2011-03-10 | Fiber Bragg grating type stick force sensor |
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| Publication Number | Publication Date |
|---|---|
| CN202075072U true CN202075072U (en) | 2011-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200629049U Expired - Fee Related CN202075072U (en) | 2011-03-10 | 2011-03-10 | Fiber Bragg grating type stick force sensor |
Country Status (1)
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|---|---|
| CN (1) | CN202075072U (en) |
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2011
- 2011-03-10 CN CN2011200629049U patent/CN202075072U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20111214 Termination date: 20140310 |