CN102221333A - Temperature-insensitive fiber bragg grating (FBG) displacement sensor with double-isosceles-triangle simply-supported-beam structure - Google Patents
Temperature-insensitive fiber bragg grating (FBG) displacement sensor with double-isosceles-triangle simply-supported-beam structure Download PDFInfo
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- CN102221333A CN102221333A CN201110088141XA CN201110088141A CN102221333A CN 102221333 A CN102221333 A CN 102221333A CN 201110088141X A CN201110088141X A CN 201110088141XA CN 201110088141 A CN201110088141 A CN 201110088141A CN 102221333 A CN102221333 A CN 102221333A
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Abstract
A temperature-insensitive fiber bragg grating (FBG) displacement sensor with a double-isosceles-triangle simply-supported-beam structure, which belongs to the fiber sensing technology field, is disclosed. The sensor comprises: a first isosceles triangle structure beam (1), a second isosceles triangle structure beam (2), a FBG (3), a tail fiber (4) and a fixed support (5). By using the unique double isosceles triangle structure, a problem of cross sensitivity of temperature and strain of the FBG can be solved in the displacement sensor.
Description
Technical field
The present invention relates to a kind of fiber grating displacement sensor that solves temperature strain cross sensitivity problem, belong to technical field of optical fiber sensing.
Background technology
Fiber-optic grating sensor is a kind of special Fibre Optical Sensor, except the characteristics with Fibre Optical Sensor, also has advantages such as anti-electromagnetic interference (EMI), electrical isolation, corrosion-resistant, highly sensitive, long transmission distance, security are good, simple in structure, light weight.Aspects such as safety monitoring at oil, chemical industry, building, highway, bridge etc. are with a wide range of applications.Yet, in actual applications, the bragg wavelength of fiber grating all is responsive to strain and temperature, and promptly there is temperature-strain cross sensitivity problem in fiber-optic grating sensor, the key that this becomes its development of restriction becomes the problem that must face and solve in the practical application.The present invention adopts a density, thickness is even but asymmetric pair of isosceles triangle simple beam structure design solved the temperature-strain cross sensitivity problem of fiber-optic grating sensor in practice.
Summary of the invention
The invention belongs to technical field of optical fiber sensing.The temperature-insensitive optical fiber optical grating displacement sensor structure that has designed a kind of pair of isosceles triangle simple beam structure is simple, easy operating.
The temperature-insensitive optical fiber optical grating displacement transducer of described a kind of pair of isosceles triangle simple beam structure is characterized in that: be made up of the first isosceles triangular structure beam (1), the second isosceles triangular structure beam (2), fiber grating (3), tail optical fiber (4) and fixed support (5).
The free beam fiber grating displacement sensor of described a kind of pair of isosceles triangular structure is characterized in that: first isosceles triangular structure beam (1) the long 5cm to 5.5cm in the end, high 9cm to 10cm; Second isosceles triangular structure beam (2) the long 4cm to 4.5cm in the end, high 7cm to 8cm; Base (5) is a square structure, and length and width are same with the end appearance of triangular beam respectively, and whole simple beam structure thickness is 4.5mm to 5.0mm, is made by uniform methyl methacrylate of density (PMMA) or the firm material of 65# manganese.
The free beam fiber grating displacement sensor of described a kind of pair of isosceles triangular structure is characterized in that: the crossover sites that fiber grating (3) rigidity is sticked on the first isoceles triangle ellbeam (1) and the second isoceles triangle ellbeam (2) with epoxy resin.
This sensor utilizes the structural design of two isosceles triangles, can solve optical fiber grating temperature-strain cross sensitivity problem, and is simple in structure, easy to operate.
Description of drawings
Fig. 1 is two isosceles triangular structure free beam fiber grating displacement sensor synoptic diagram;
Fig. 2 is a reflectance spectrum broadening lab diagram under the different displacement situations.
Embodiment
Example 1: as shown in Figure 1, the temperature-insensitive optical fiber optical grating displacement transducer of a kind of pair of isosceles triangle simple beam structure is made up of the first isosceles triangular structure beam (1), the second isosceles triangular structure beam (2), fiber grating (3), tail optical fiber (4) and fixed support (5).
First isosceles triangular structure beam (1) end is long to be 5cm, and height is 9cm; Second isosceles triangular structure beam (2) end is long to be 4cm, and height is 7cm; Base (5) is a square structure, and length and width are same with the end appearance of triangular beam respectively, and whole simple beam structure thickness is 4.5mm.
Fiber grating (3) rigidity is sticked on the crossover sites of the first isoceles triangle ellbeam (1) and the second isoceles triangle ellbeam (2) with epoxy resin.The material of the first isoceles triangle ellbeam (1) and the second isoceles triangle ellbeam (2) is the uniform methyl methacrylate of density (PMMA), and fixed support (5) is fixed between the two proper supporting objects, is convenient to measure the size of displacement behind the beam pressurized.
The present invention is based on following principle: fiber grating is under temperature and stress, all can cause the drift of bragg wavelength, when fiber grating was used for sensing measurement, single fiber grating self can't be told the drift value of the Bragg wavelength that strain and temperature cause respectively.
The present invention adopts special two isosceles triangle simple beam structure designs, the fiber grating rigidity is sticked on the axis of two triangle crossover sites, because the two triangle structure is asymmetric, when onesize masterpiece is used for this crossover sites, the two triangle beam can produce two bendings in various degree, thereby the fiber grating that makes rigidity stick on two ends, the cross spider left and right sides is subjected to two strains that vary in size, make the stressed stepped distribution of fiber grating, chirp makes through fiber grating reflectance spectrum broadening.Each position thickness of free beam is identical, and material is even, and temperature variation is identical to the influence at each position of material.As shown in Figure 2, when changing in the scope of displacement at 0mm to 15mm, reflectance spectrum is linear broadening, and integral body moves to long wavelength's direction.Therefore, temperature variation only can make spectrum integral body drift about towards a direction to the not influence of width of output spectrum.Based on the temperature-insensitive characteristic of reflectance spectrum, can realize displacement measurement by the variation that detects spectral width.
Claims (3)
1. the temperature-insensitive optical fiber optical grating displacement transducer of two isosceles triangle simple beam structures, belong to technical field of optical fiber sensing, form by the first isosceles triangular structure beam (1), the second isosceles triangular structure beam (2), fiber grating (3), tail optical fiber (4) and fixed support (5).
2. the free beam fiber grating displacement sensor of a kind of pair of isosceles triangular structure according to claim 1, it is characterized in that: the end length of the first isosceles triangular structure beam (1) as shown in Figure 1 is 5cm to 5.5cm, high 9cm to 10cm; The end length of the second isosceles triangular structure beam (2) is 4cm to 4.5cm, high 7cm to 8cm; Base (5) is a square structure, and length and width are same with the end appearance of triangular beam respectively, and whole simple beam structure thickness is 4.5mm to 5.0mm, is made by uniform methyl methacrylate of density (PMMA) or the firm material of 65# manganese.
3. according to claim 1, the free beam fiber grating displacement sensor of a kind of pair of isosceles triangular structure is characterized in that: the crossover sites that fiber grating (3) rigidity is sticked on the first isoceles triangle ellbeam (1) and the second isoceles triangle ellbeam (2) with epoxy resin.
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| CN201110088141XA CN102221333A (en) | 2011-04-06 | 2011-04-06 | Temperature-insensitive fiber bragg grating (FBG) displacement sensor with double-isosceles-triangle simply-supported-beam structure |
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| CN201110088141XA CN102221333A (en) | 2011-04-06 | 2011-04-06 | Temperature-insensitive fiber bragg grating (FBG) displacement sensor with double-isosceles-triangle simply-supported-beam structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728009A (en) * | 2014-01-22 | 2014-04-16 | 重庆邮电大学 | Vibration detecting optical fiber sensor |
| CN103968773A (en) * | 2013-01-29 | 2014-08-06 | 中国计量学院 | Flexible high-temperature raster strain foil for two-dimensional stress detection |
| CN104089927A (en) * | 2014-07-23 | 2014-10-08 | 中国计量学院 | Temperature insensitive solution concentration sensor based on semi-corrosion optical fiber grating |
| CN107300363A (en) * | 2016-05-12 | 2017-10-27 | 中国计量大学 | A kind of positive tetrahedron optical fibre grating three-dimensional strain detecting structure |
| CN111879970A (en) * | 2020-08-31 | 2020-11-03 | 防灾科技学院 | Temperature insensitive FBG acceleration sensor and method based on strain chirp effect |
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| CN2679702Y (en) * | 2003-12-18 | 2005-02-16 | 南开大学 | Optical fiber raster temp sensing booster having double shoulder beams |
| KR100774372B1 (en) * | 2006-07-24 | 2007-11-08 | 한국과학기술연구원 | Sensor for simultaneous measurement of bending and temperature based on sampled chirped fiber bragg grating |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968773A (en) * | 2013-01-29 | 2014-08-06 | 中国计量学院 | Flexible high-temperature raster strain foil for two-dimensional stress detection |
| CN103728009A (en) * | 2014-01-22 | 2014-04-16 | 重庆邮电大学 | Vibration detecting optical fiber sensor |
| CN103728009B (en) * | 2014-01-22 | 2016-01-13 | 重庆邮电大学 | A kind of Fibre Optical Sensor detecting vibration |
| CN104089927A (en) * | 2014-07-23 | 2014-10-08 | 中国计量学院 | Temperature insensitive solution concentration sensor based on semi-corrosion optical fiber grating |
| CN107300363A (en) * | 2016-05-12 | 2017-10-27 | 中国计量大学 | A kind of positive tetrahedron optical fibre grating three-dimensional strain detecting structure |
| CN111879970A (en) * | 2020-08-31 | 2020-11-03 | 防灾科技学院 | Temperature insensitive FBG acceleration sensor and method based on strain chirp effect |
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Application publication date: 20111019 |