CN202141546U - High pressure sensor having fiber Bragg grating based on carbon fiber lamination composite material - Google Patents
High pressure sensor having fiber Bragg grating based on carbon fiber lamination composite material Download PDFInfo
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- CN202141546U CN202141546U CN2010201374108U CN201020137410U CN202141546U CN 202141546 U CN202141546 U CN 202141546U CN 2010201374108 U CN2010201374108 U CN 2010201374108U CN 201020137410 U CN201020137410 U CN 201020137410U CN 202141546 U CN202141546 U CN 202141546U
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Abstract
The utility model relates to a high pressure sensor having FBGs (Fiber Bragg Grating) based on a carbon fiber lamination composite material and belongs to the sensor field. An external pressure causes the deformation of the carbon fiber layer lamination composite material, so as to make the wavelengths of the FBGs bonded on the material shift. The pressure value can be measured through measuring the shift volume of the wavelengths. The sensor includes two FBGs. One FBG is a traditional grating which is sensitive to pressure while the other FBG is a reference grating which is only sensitive to temperature. In order to let the pressure pass through, the traditional grating and the reference grating are protected with a metal protective sleeve having holes and a metal protective sleeve having no hole respectively. One end of the reference grating suspends in the metal protective sleeve having no hole while the other end of the reference grating is sealed with epoxy resin glue to ensure that the pressure can not pass through, so as to realize that the reference grating is only sensitive to temperature. In order to make convenience for connecting with an external optical fiber, an optical fiber connector is adopted in the utility model and a supporting structure for the optical fiber connector is designed. The sensor in the structure is suitable for liquid pressure measuring under high pressure, such as underground pressure measuring of a gas well in an oil field.
Description
Technical field:
The utility model patent belongs to sensor field, and a kind of specifically Fiber Bragg Grating pressure transducer based on carbon fibre lamination compound substance has wide range, high sensitivity, temperature compensation function.
Background technology:
The pressure sensor application scope is wide, and demand is big.Along with development of science and technology, it is big that people have also proposed range to the measurement of pressure, and precision is high, and response is fast, can be in requirements such as rugged surroundings work such as inflammable and explosive.Fiber-optic grating sensor is a kind of emerging sensor of fast development, is main with Fiber Bragg Grating (Fiber Bragg Grating is called for short FBG) especially.FBG can be optionally reflects back the light of a certain narrowband wavelength in the incident broadband light.It is long that catoptrical centre wavelength is called cloth loudspeaker lattice wave.Cloth loudspeaker lattice wave length is by grating effective refractive index and the decision of grating cycle, and these two parameters are responsive to strain and temperature variation.Just can know the strain and the temperature information at grating place through the cloth loudspeaker lattice wavelength change that detects optical grating reflection.But the meridional stress sensitivity of naked FBG is lower, under the pressure of 70Mpa, only changes 0.22nm.Be to improve the meridional stress sensitivity of FBG, generally FBG is sticked on the pressure deformation surface or be embedded in the pressure deformation body.When ambient pressure acts on the pressure deformation body, the pressure deformation body will drive FBG strain variation will take place together like this, and the reflection wavelength of FBG changes thereupon, can know the situation of pressure through the wavelength change that detects optical grating reflection.For example there is the researcher that FBG is packaged in the high molecular polymer, utilizes flexible members such as polymkeric substance or elastic film to amplify the acting force of outer bound pair grating, thereby improve the pressure sensitivity of grating.But the said system range for measuring is all big inadequately.Also there is the researcher to propose to develop pressure transducer with the birefringence effect of FBG.But, brought very big difficulty to demodulation because the birefringent polarizing spaces of FBG is less.
Summary of the invention:
The purpose of the utility model patent: provide a kind of wide range, high sensitivity has the Fiber Bragg Grating pressure transducer based on carbon fibre lamination compound substance of temperature compensation function.
The utility model technical scheme is:
Fiber Bragg Grating high pressure sensor based on carbon fibre lamination compound substance comprises pressure measurement unit, temperature compensation component with draw optical fiber components.
Use is based on the Fiber Bragg Grating high pressure sensor of carbon fibre lamination compound substance; This sensor comprises perforated metal protective casing, pressure survey FBG, carbon fibre lamination compound substance, trough of belt metal tube, temperature survey FBG, non-perforated metal protective casing, pressure seal I, pressure seal II, joint sleeve, optical fiber, outside joint sleeve, joints of optical fibre supporting sleeve, joints of optical fibre composition; It is characterized in that being fixed in pressure survey FBG on the surface of carbon fibre lamination compound substance with epoxide-resin glue; And this carbon fibre lamination compound substance is protected with the perforated metal protective casing; And for letting pressure pass through; With temperature survey FBG with adhering with epoxy resin on the metal tube of trough of belt; With perforated metal protective casing, pressure seal I, pressure seal II are not isolated with temperature survey FBG and ambient pressure together; One end of the metal tube of trough of belt is suspended in the metal coating sleeve pipe, through optical fiber fusion welding technology pressure survey FBG, temperature survey FBG, optical fiber and the joints of optical fibre is linked together.
After implementing the utility model, for society provides a kind of simple and reliable fiber grating encapsulating structure, not only encapsulation is simple, and range for measuring is big, and is highly sensitive; Function with temperature compensation; In optical fiber grating sensing is used, breakthrough technology has been proposed.
Description of drawings:
The structural representation of Fig. 1 the utility model patent
The experimental result of Fig. 2 the utility model patent
Embodiment
Combine accompanying drawing that the utility model is described further at present:
This sensor comprises perforated metal protective casing 1, pressure survey FBG 2, carbon fibre lamination compound substance 3, trough of belt metal tube 4, temperature survey FBG5, non-perforated metal protective casing 6, pressure seal I 7, pressure seal II 8, joint sleeve 9, optical fiber 10, outside joint sleeve 11, joints of optical fibre supporting sleeve 12, the joints of optical fibre 13 compositions.Pressure survey FBG2 is fixed on the surface of carbon fibre lamination compound substance 3 with epoxide-resin glue; And use perforated metal protective casing 1 to protect and for letting pressure pass through; Temperature survey FBG 5 usefulness adhering with epoxy resin are on the metal tube 4 of trough of belt; With perforated metal protective casing 6, pressure seal I 7, pressure seal II 8 are not isolated with ambient pressure with temperature survey FBG 5 together; One end of the metal tube 4 of trough of belt is suspended on not in the perforated metal protective casing 6; Guarantee that temperature survey FBG 5 does not receive extraneous stress influence, links together pressure survey FBG 2, temperature survey FBG 5, optical fiber 10 and the joints of optical fibre 13 through optical fiber fusion welding technology, and is protected by joint sleeve 9, outside joint sleeve 11, joints of optical fibre supporting sleeve 12.
Carbon fibre lamination compound substance 3 is made up of carbon fibre slice and epoxy resin.Epoxide-resin glue closely sticks on square carbon fibre slice together.
Perforated metal protective casing 1, not perforated metal protective casing 6, joint sleeve 9 with being threaded, and seal with epoxide-resin glue between outside joint sleeve 11 and the joints of optical fibre supporting sleeve 12.
The sensing principle of work of the utility model patent is following:
Because FBG is responsive to pressure and temperature, so pressure survey FBG responds pressure and temperature simultaneously.Suppose that the reflection wavelength of pressure survey FBG is λ when a standard atmospheric pressure, 25 ℃ of temperature
10, then under the pressure and temperature effect, the reflection wavelength variation delta λ of pressure survey FBG
1For:
Δλ
1＝λ
1-λ
1?0＝αΔP+βΔT (1)
λ in the formula
1Reflection wavelength for pressure survey FBG.Δ P ambient pressure is with respect to the variable quantity of a standard atmospheric pressure.Δ T is the variable quantity of environment temperature with respect to 25 ℃.α and β are respectively the pressure and temperature response coefficient of pressure survey FBG.
And temperature survey FBG is owing to completely cutting off with ambient pressure, only to temperature-responsive.Suppose that in the time of 25 ℃, the reflection wavelength of temperature survey FBG is λ
20, so under temperature variation, the reflection wavelength variation delta λ of temperature survey FBG
2For:
Δλ
2＝λ
2-λ
2?0＝γΔT (2)
λ in the formula
2Reflection wavelength for temperature survey FBG.γ is the temperature-responsive coefficient of temperature survey FBG.The variable quantity of Δ T temperature with respect to 25 ℃.
Because sensing grating and lean on very closely with reference to grating in the utility model patent, they have identical temperature variation.Can know the temperature variation of pressure survey FBG through temperature survey FBG.Use formula (1) to obtain pressure variety then:
ΔP＝(Δλ
1-β·ΔT)/α (3)
Obtain pressure variety and just can know the ambient pressure value.
Claims (3)
1. Fiber Bragg Grating high pressure sensor based on carbon fibre lamination compound substance; This sensor comprises perforated metal protective casing, pressure survey FBG, carbon fibre lamination compound substance, trough of belt metal tube, temperature survey FBG, non-perforated metal protective casing, pressure seal I, pressure seal II, joint sleeve, optical fiber, outside joint sleeve, joints of optical fibre supporting sleeve, joints of optical fibre composition; It is characterized in that being fixed in pressure survey FBG on the surface of carbon fibre lamination compound substance with epoxide-resin glue; And this carbon fibre lamination compound substance is protected with the perforated metal protective casing; And for letting pressure pass through; With temperature survey FBG with adhering with epoxy resin on the metal tube of trough of belt; With perforated metal protective casing, pressure seal I, pressure seal II are not isolated with temperature survey FBG and ambient pressure together; One end of the metal tube of trough of belt is suspended in the metal coating sleeve pipe, through optical fiber fusion welding technology pressure survey FBG, temperature survey FBG, optical fiber and the joints of optical fibre is linked together.
2. the Fiber Bragg Grating high pressure sensor based on carbon fibre lamination compound substance according to claim 1; It is characterized in that: carbon fibre lamination compound substance is made up of carbon fibre slice and epoxy resin, and epoxide-resin glue closely sticks on square carbon fibre slice together.
3. the Fiber Bragg Grating high pressure sensor based on carbon fibre lamination compound substance according to claim 1; It is characterized in that: perforated metal protective casing (1), not between perforated metal protective casing (6), joint sleeve (9) and the outside joint sleeve (11) with being threaded, and seal with epoxide-resin glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201374108U CN202141546U (en) | 2010-03-23 | 2010-03-23 | High pressure sensor having fiber Bragg grating based on carbon fiber lamination composite material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201374108U CN202141546U (en) | 2010-03-23 | 2010-03-23 | High pressure sensor having fiber Bragg grating based on carbon fiber lamination composite material |
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| CN202141546U true CN202141546U (en) | 2012-02-08 |
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| CN2010201374108U Expired - Fee Related CN202141546U (en) | 2010-03-23 | 2010-03-23 | High pressure sensor having fiber Bragg grating based on carbon fiber lamination composite material |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674358A (en) * | 2013-11-25 | 2014-03-26 | 中国航空工业集团公司北京长城计量测试技术研究所 | Method for compensating temperature of diaphragm type fiber F-P (Fabry-Perot) cavity pressure sensor |
| CN104198083A (en) * | 2014-08-20 | 2014-12-10 | 中国石油集团渤海钻探工程有限公司 | Fiber grating temperature sensor |
| CN104198096A (en) * | 2014-08-27 | 2014-12-10 | 基康仪器股份有限公司 | Fiber bragg grating pressure sensor used in high-temperature high-voltage environment and manufacturing method |
| CN105157889A (en) * | 2015-09-11 | 2015-12-16 | 江苏大学 | Sensor based on carbon-fibre composite material |
| CN105841878A (en) * | 2016-05-17 | 2016-08-10 | 中国电子科技集团公司第八研究所 | High temperature resistance fiber bragg grating pressure sensor |
| CN110186589A (en) * | 2019-05-15 | 2019-08-30 | 中国葛洲坝集团第一工程有限公司 | A kind of fiber grating temperature sensor and assembly method of high water pressure resistant |
| CN112525237A (en) * | 2019-09-17 | 2021-03-19 | 武汉理工大学 | EFPI-FBG composite pressure and temperature sensor based on epoxy resin packaging and measuring method |
-
2010
- 2010-03-23 CN CN2010201374108U patent/CN202141546U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674358A (en) * | 2013-11-25 | 2014-03-26 | 中国航空工业集团公司北京长城计量测试技术研究所 | Method for compensating temperature of diaphragm type fiber F-P (Fabry-Perot) cavity pressure sensor |
| CN103674358B (en) * | 2013-11-25 | 2015-06-17 | 中国航空工业集团公司北京长城计量测试技术研究所 | Method for compensating temperature of diaphragm type fiber F-P (Fabry-Perot) cavity pressure sensor |
| CN104198083A (en) * | 2014-08-20 | 2014-12-10 | 中国石油集团渤海钻探工程有限公司 | Fiber grating temperature sensor |
| CN104198096A (en) * | 2014-08-27 | 2014-12-10 | 基康仪器股份有限公司 | Fiber bragg grating pressure sensor used in high-temperature high-voltage environment and manufacturing method |
| CN105157889A (en) * | 2015-09-11 | 2015-12-16 | 江苏大学 | Sensor based on carbon-fibre composite material |
| CN105157889B (en) * | 2015-09-11 | 2017-11-17 | 江苏大学 | A kind of sensor based on carbon fibre composite |
| CN105841878A (en) * | 2016-05-17 | 2016-08-10 | 中国电子科技集团公司第八研究所 | High temperature resistance fiber bragg grating pressure sensor |
| CN110186589A (en) * | 2019-05-15 | 2019-08-30 | 中国葛洲坝集团第一工程有限公司 | A kind of fiber grating temperature sensor and assembly method of high water pressure resistant |
| CN112525237A (en) * | 2019-09-17 | 2021-03-19 | 武汉理工大学 | EFPI-FBG composite pressure and temperature sensor based on epoxy resin packaging and measuring method |
| CN112525237B (en) * | 2019-09-17 | 2023-03-24 | 武汉理工大学 | EFPI-FBG composite pressure and temperature sensor based on epoxy resin packaging and measuring method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: L.C. Pegasus Corporation Document name: Notification of Termination of Patent Right |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120208 Termination date: 20140323 |
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| EXPY | Termination of patent right or utility model |