CN103673914A - Optical fiber grating strain sensor and installation method thereof - Google Patents
Optical fiber grating strain sensor and installation method thereof Download PDFInfo
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- CN103673914A CN103673914A CN201310685222.7A CN201310685222A CN103673914A CN 103673914 A CN103673914 A CN 103673914A CN 201310685222 A CN201310685222 A CN 201310685222A CN 103673914 A CN103673914 A CN 103673914A
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- bragg grating
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Abstract
The invention relates to an optical fiber grating strain sensor and an installation method thereof. The optical fiber grating strain sensor comprises high-elasticity beams, supporting columns, a stopping piece, installation substrates and an optical fiber grating. When the optical fiber grating strain sensor is packed, the supporting columns and the stopping piece provide supporting force for optical fiber grating pre-loaded tension strain. The installation method of the optical fiber grating strain sensor includes the steps that the installation substrates are pasted to or welded to the surface of a to-be-tested structure, or optical fibers in the high-elasticity beams at two ends of the optical fiber grating are connected to the surface of the to-be-tested structure in an adhesive mode, and then the stopping piece is removed. According to the structure and the installation method of the optical fiber grating strain sensor, the supporting force is provided for the optical fiber grating pre-loaded tension strain through the supporting columns and the stopping piece, requirements for consistency of materials of the structure and machining accuracy are low, and due to the fact that the stopping piece is removed, the optical fiber grating strain sensor has good strain sensitivity and sensitivity consistency.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, be specifically related to a kind of fiber Bragg grating strain sensor and installation method thereof.
Background technology
Fiber Bragg grating strain sensor utilize fiber grating reflectance spectrum centre wavelength and fiber grating the linear relationship between strained measure, have that anti-electromagnetic interference (EMI), volume are little, far measuring distance, signal are easily transmitted, the easy advantage such as multiplexing, good stability, become the important means of structured testing and monitoring structural health conditions.
There is easy tensile strain, be difficult for being applied in compressive strain in fiber grating, and grid region reflectance spectrum under nonhomogeneous strain effect easily produces the problem of warbling; When optical fiber Bragg grating encapsulation becomes strain transducer, need to warble etc. and to carry out structure and installation method design targetedly for draw/compressive strain measurement, antireflection spectrum.
The existing a kind of fiber Bragg grating strain sensor structure that can simultaneously measure draw/compressive strain and installation method, shown in patent " WO2009106576A1; Method and Means for Monitoring A Bragg Fibre on a Surface ", directly apply the Polymide of high elastic modulus or ORMOCER material as strain transducer in the grid region of fiber grating; Erecting tools by is as shown in Figure 1 at fiber grating and treat to form uniform adhesive linkage between geodesic structure, the grid region of fiber grating is closely bonded to the measurement that realizes draw/compressive strain at body structure surface to be measured.Fiber Bragg grating strain sensor structure and the installation method of draw/compressive strain of this measurement, depend on fiber grating and treat the homogeneity of the bonding glue-line between geodesic structure, rubber thickness asymmetry, bubble etc. can cause fiber grating strain inhomogeneous, thereby cause the reflectance spectrum of fiber grating to be warbled, affect the accurate measurement of fiber Bragg grating strain sensor.In Fig. 1: fiber Bragg grating strain sensor sectional fixture 1, chamber 3,2, the second, first chamber, optical fiber duct 4, optical fiber duct 5, clamp area 6, clamp area 7, the longitudinal axis 11 of fiber Bragg grating strain sensor sectional fixture.
Existing fiber Bragg grating strain sensor structure and the installation method that can measure draw/compressive strain simultaneously and can avoid reflectance spectrum to warble, fixed fiber grating two ends and treat geodesic structure only, measure when fiber grating prestrain stretching strain is realized to draw/compressive strain.When adopting the fiber Bragg grating strain sensor structure of prestrain stretching strain, encapsulating structure itself is to fiber grating generation reinforcement effect, thus cause the sensitivity of fiber Bragg grating strain sensor and sensitivity consistance poor.
Summary of the invention
The object of the invention is to overcome the above-mentioned deficiency of prior art, a kind of fiber Bragg grating strain sensor is provided, this fiber Bragg grating strain sensor is simple in structure, be easy to processing, low to material consistance and the requirement on machining accuracy of structure, and makes fiber Bragg grating strain sensor have high strain sensitivity and sensitivity consistance.
Another object of the present invention is to provide a kind of installation method of fiber Bragg grating strain sensor.
Above-mentioned purpose of the present invention is mainly achieved by following technical solution:
A fiber Bragg grating strain sensor, comprises high resiliency beam, support column, mounting substrate, catch and fiber grating, and wherein the first high resiliency beam, the first support column, the second high resiliency beam and the second support column are in turn connected to form frame structure; The first mounting substrate is connected with the first high resiliency beam, and the second mounting substrate is connected with the second high resiliency beam, and the first mounting substrate and the second mounting substrate be all positioned at frame structure outside and with frame structure copline; Fiber grating is fixedly connected with mounting substrate, on the first support column or the second support column, leave opening, before the neutralization of fiber Bragg grating strain sensor encapsulation process is installed and used, catch is arranged on the opening part of the first support column or the second support column, guarantees that opening size remained unchanged before the neutralization of fiber Bragg grating strain sensor encapsulation process is installed and used.
In above-mentioned fiber Bragg grating strain sensor, catch is sheet metal or tinsel, or is the bonded adhesives that heat fusing or chemical solution are removed.
In above-mentioned fiber Bragg grating strain sensor, bonded adhesives is the cyanoacrylate that acetone soln is removed.
In above-mentioned fiber Bragg grating strain sensor, four angles of the frame structure that the first high resiliency beam, the second high resiliency beam, the first support column and the second support column form are fillet or right angle.
In above-mentioned fiber Bragg grating strain sensor, fiber grating is bonded in the bottom of mounting substrate.
The installation method of fiber Bragg grating strain sensor, comprises the steps:
Mounting substrate is bonding or be welded on body structure surface to be measured with high elastic modulus bonded adhesives, then remove catch, the elastic modulus of described high elastic modulus bonded adhesives is greater than 500MPa.
The installation method of fiber Bragg grating strain sensor, comprises the steps:
The two ends that fiber grating are positioned to frame structure are bonded in body structure surface to be measured with high elastic modulus bonded adhesives, then remove catch, mounting substrate and frame structure, and the elastic modulus of described high elastic modulus bonded adhesives is greater than 500MPa.
In the installation method of above-mentioned fiber Bragg grating strain sensor, high elastic modulus bonded adhesives is epoxy resin or polyurethane.
In the installation method of above-mentioned fiber Bragg grating strain sensor, catch is sheet metal or tinsel, or is the bonded adhesives that heat fusing or chemical solution are removed, and described bonded adhesives is the cyanoacrylate that acetone soln is removed.
In the installation method of above-mentioned fiber Bragg grating strain sensor, the method for removing catch is, if catch is sheet metal or tinsel, by applying pulling force, catch to be removed from the opening of the first support column or the second support column; If catch is bonded adhesives, adopt heat fused or acetone solution to remove.
The present invention compared with prior art has following beneficial effect:
(1), the present invention has carried out innovative design to the structure of fiber Bragg grating strain sensor, adopt the structure of high resiliency beam, support column, mounting substrate, catch and fiber grating, by support column and catch, be that fiber grating prestrain strain provides support power, low to material consistance and the requirement on machining accuracy of structure;
(2), fiber Bragg grating strain sensor of the present invention is by removing catch, the axial strength of fiber Bragg grating strain sensor reduces, and makes fiber Bragg grating strain sensor have high strain sensitivity and sensitivity consistance;
(3), in fiber Bragg grating strain sensor of the present invention for metal catch, by applying pulling force, catch is removed from support column opening; For interim bonded adhesives, adopt heating or acetone solution to remove, can select according to different needs, dirigibility is high;
(4), fiber Bragg grating strain sensor of the present invention is simple in structure, be easy to realize, and installation process is simple, can adopt integral sensors structure or installing optical fibres grating are only installed, and according to difference, needs to select, dirigibility is high, practical.
Accompanying drawing explanation
Fig. 1 is the fiber Bragg grating strain sensor installation method schematic diagram of existing direct bonding fiber grating grid region and body structure surface to be measured;
Fig. 2 is fiber Bragg grating strain sensor of the present invention structural representation before encapsulation process neutralization is installed and used;
Fig. 3 is that fiber Bragg grating strain sensor of the present invention is arranged on the structural representation after geodesic structure.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Be illustrated in figure 2 fiber Bragg grating strain sensor of the present invention structural representation before encapsulation process neutralization is installed and used, fiber Bragg grating strain sensor of the present invention comprises the first high resiliency beam 14a, the second high resiliency beam 14b, the first support column 15a, the second support column 15b, the first mounting substrate 17a, the second mounting substrate 17b, catch 16 and fiber grating 13, wherein the first high resiliency beam 14a, the first support column 15a, the second high resiliency beam 14b and the second support column 15b are in turn connected to form frame structure, and four angles of the frame structure of formation can be fillet or right angle.
The first mounting substrate 17a is connected with the first high resiliency beam 14a, and the second mounting substrate 17b is connected with the second high resiliency beam 14b, and the first mounting substrate 17a and the second mounting substrate 17b be all positioned at frame structure outside and with frame structure copline.
The installation method of fiber Bragg grating strain sensor of the present invention has two kinds, and wherein a kind of method is:
In another, method is:
The two ends 18a, the 18b that fiber grating 13 are positioned to frame structure are bonded in body structure surface to be measured with high elastic modulus bonded adhesives, then remove catch 16, mounting substrate 17a, 17b and frame structure.The elastic modulus of high elastic modulus bonded adhesives is greater than 500MPa, and for example high elastic modulus bonded adhesives is epoxy resin or polyurethane.Be illustrated in figure 3 fiber Bragg grating strain sensor of the present invention and be arranged on the structural representation after geodesic structure, in Fig. 3, provided the diagram of removing catch 16.
The method of above-mentioned removal catch 16 is: if catch 16 is sheet metal or tinsel, by applying pulling force, catch 16 is removed from the first support column 15a opening; If catch 16 is bonded adhesives, adopt heat fused or acetone solution to remove.Remove after catch 16, the axial strength of fiber Bragg grating strain sensor reduces, and obtains good strain sensitivity and sensitivity consistance.
The above; only be the embodiment of the best of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.
The content not being described in detail in instructions of the present invention belongs to professional and technical personnel in the field's known technology.
Claims (10)
1. a fiber Bragg grating strain sensor, it is characterized in that: comprise high resiliency beam (14a, 14b), support column (15a, 15b), mounting substrate (17a, 17b), catch (16) and fiber grating (13), wherein the first high resiliency beam (14a), the first support column (15a), the second high resiliency beam (14b) and the second support column (15b) are in turn connected to form frame structure; The first mounting substrate (17a) is connected with the first high resiliency beam (14a), the second mounting substrate (17b) is connected with the second high resiliency beam (14b), and the first mounting substrate (17a) and the second mounting substrate (17b) be all positioned at frame structure outside and with frame structure copline; Fiber grating (13) is fixedly connected with mounting substrate (17a, 17b), on the first support column (15a) or the second support column (15b), leave opening, before the neutralization of fiber Bragg grating strain sensor encapsulation process is installed and used, catch (16) is arranged on the opening part of the first support column (15a) or the second support column (15b), guarantees that opening size remained unchanged before the neutralization of fiber Bragg grating strain sensor encapsulation process is installed and used.
2. a kind of fiber Bragg grating strain sensor according to claim 1, is characterized in that: described catch (16) is sheet metal or tinsel, or is the bonded adhesives that heat fusing or chemical solution are removed.
3. a kind of fiber Bragg grating strain sensor according to claim 2, is characterized in that: described bonded adhesives is the cyanoacrylate that acetone soln is removed.
4. a kind of fiber Bragg grating strain sensor according to claim 1, is characterized in that: four angles of the frame structure that described the first high resiliency beam (14a), the second high resiliency beam (14b), the first support column (15a) and the second support column (15b) form are fillet or right angle.
5. a kind of fiber Bragg grating strain sensor according to claim 1, is characterized in that: described fiber grating (13) is bonded in the bottom of mounting substrate (17a, 17b).
6. the installation method of a kind of fiber Bragg grating strain sensor claimed in claim 1, is characterized in that comprising the steps:
Mounting substrate (17a, 17b) is bonding or be welded on body structure surface to be measured with high elastic modulus bonded adhesives, then remove catch (16), the elastic modulus of described high elastic modulus bonded adhesives is greater than 500MPa.
7. the installation method of a kind of fiber Bragg grating strain sensor claimed in claim 1, is characterized in that comprising the steps:
The two ends (18a, 18b) that fiber grating (13) are positioned to frame structure are bonded in body structure surface to be measured with high elastic modulus bonded adhesives, then remove catch (16), mounting substrate (17a, 17b) and frame structure, the elastic modulus of described high elastic modulus bonded adhesives is greater than 500MPa.
8. according to the installation method of a kind of fiber Bragg grating strain sensor described in claim 6 or 7, it is characterized in that: described high elastic modulus bonded adhesives is epoxy resin or polyurethane.
9. according to the installation method of a kind of fiber Bragg grating strain sensor described in claim 6 or 7, it is characterized in that: described catch (16) is sheet metal or tinsel, or be the bonded adhesives that heat fusing or chemical solution are removed, described bonded adhesives is the cyanoacrylate that acetone soln is removed.
10. the installation method of a kind of fiber Bragg grating strain sensor according to claim 9, it is characterized in that: the method for described removal catch (16) is, if catch (16) is sheet metal or tinsel, by applying pulling force, catch (16) is removed from the opening of the first support column (15a) or the second support column (15b); If catch (16) is bonded adhesives, adopt heat fused or acetone solution to remove.
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| CN201310685222.7A CN103673914B (en) | 2013-12-13 | 2013-12-13 | A kind of fiber Bragg grating strain sensor and installation method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2885619A1 (en) * | 2012-08-15 | 2015-06-24 | Siemens Energy, Inc. | Frame foot loading measurement system using fiber optic sensing technique |
| CN106840018A (en) * | 2016-11-02 | 2017-06-13 | 北京信息科技大学 | A kind of fiber Bragg grating strain sensor method for packing |
| CN108225206A (en) * | 2017-12-27 | 2018-06-29 | 北京航天控制仪器研究所 | A kind of reusable fiber Bragg grating strain sensor |
| CN108473833A (en) * | 2016-01-15 | 2018-08-31 | 日东电工株式会社 | Curing type adhesive/bonding sheet |
| CN108838594A (en) * | 2018-08-23 | 2018-11-20 | 北京通为科技有限公司 | The encapsulating structure of fiber-optic grating sensor |
| CN109883588A (en) * | 2019-04-09 | 2019-06-14 | 薛珣 | A kind of fiber grating force-measuring anchor stock |
| CN110044288A (en) * | 2019-04-03 | 2019-07-23 | 西北工业大学 | High temperature resistant strain transducer based on FBG |
| CN112880579A (en) * | 2017-09-22 | 2021-06-01 | 泰雷兹管理与服务德国股份有限公司 | Strain measuring device, in particular for axle counters |
| CN112880584A (en) * | 2021-02-09 | 2021-06-01 | 北京航天控制仪器研究所 | High-temperature-resistant strain sensor with fiber bragg grating preloaded compressive stress and preparation method thereof |
| CN114812420A (en) * | 2021-12-31 | 2022-07-29 | 中国空气动力研究与发展中心超高速空气动力研究所 | Mounting glue and application thereof in optical fiber sensor |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2885619A1 (en) * | 2012-08-15 | 2015-06-24 | Siemens Energy, Inc. | Frame foot loading measurement system using fiber optic sensing technique |
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| CN106840018A (en) * | 2016-11-02 | 2017-06-13 | 北京信息科技大学 | A kind of fiber Bragg grating strain sensor method for packing |
| CN112880579A (en) * | 2017-09-22 | 2021-06-01 | 泰雷兹管理与服务德国股份有限公司 | Strain measuring device, in particular for axle counters |
| CN112880579B (en) * | 2017-09-22 | 2022-12-13 | 泰雷兹管理与服务德国股份有限公司 | Strain measuring device, in particular for axle counters |
| CN108225206A (en) * | 2017-12-27 | 2018-06-29 | 北京航天控制仪器研究所 | A kind of reusable fiber Bragg grating strain sensor |
| CN108838594A (en) * | 2018-08-23 | 2018-11-20 | 北京通为科技有限公司 | The encapsulating structure of fiber-optic grating sensor |
| CN108838594B (en) * | 2018-08-23 | 2023-10-27 | 北京通为科技有限公司 | Packaging structure of fiber Bragg grating sensor |
| CN110044288A (en) * | 2019-04-03 | 2019-07-23 | 西北工业大学 | High temperature resistant strain transducer based on FBG |
| CN109883588A (en) * | 2019-04-09 | 2019-06-14 | 薛珣 | A kind of fiber grating force-measuring anchor stock |
| CN112880584A (en) * | 2021-02-09 | 2021-06-01 | 北京航天控制仪器研究所 | High-temperature-resistant strain sensor with fiber bragg grating preloaded compressive stress and preparation method thereof |
| CN114812420A (en) * | 2021-12-31 | 2022-07-29 | 中国空气动力研究与发展中心超高速空气动力研究所 | Mounting glue and application thereof in optical fiber sensor |
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