CN209842165U - Multi-core optical fiber intelligent composite rib - Google Patents
Multi-core optical fiber intelligent composite rib Download PDFInfo
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- CN209842165U CN209842165U CN201920505215.7U CN201920505215U CN209842165U CN 209842165 U CN209842165 U CN 209842165U CN 201920505215 U CN201920505215 U CN 201920505215U CN 209842165 U CN209842165 U CN 209842165U
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Abstract
The utility model discloses a compound muscle of multicore optic fibre intelligence, including many fibre reinforced plastic muscle and the armor line of cladding outside many fibre reinforced plastic muscle, at least one replacement is drawn the muscle for the fibre optic fibre complex that contains multicore optic fibre in many fibre reinforced plastic muscle, fibre optic fibre complex is drawn the muscle and is included multicore optic fibre and wrap up at multicore optic fibre reinforcing fiber all around, it is fixed continuous through thermosetting resin between the reinforcing fiber of multicore optic fibre and its week, also fill through thermosetting resin between many fibre reinforced plastic muscle and between fibre reinforced plastic muscle and the fibre optic fibre complex is drawn between the muscle. The armor wires are wrapped with a reinforcing layer. The utility model discloses have multicore optic fibre and fiber reinforced plastic's advantage concurrently, light weight is high-strength, antifatigue, corrosion-resistant and the sensing precision is high. The method overcomes the defect that the bare optical fiber is difficult to adapt to the requirement of extensive construction of a reinforced concrete structure, and greatly improves the durability of the multi-core optical fiber.
Description
Technical Field
The utility model relates to a structural health monitoring technical field relates to a structure intelligent monitoring sensing element, concretely relates to compound muscle of multicore optic fibre intelligence with civil engineering structure atress and monitoring dual function.
Background
Fiber reinforced plastics are composites composed of continuous fibers that are first impregnated with a polymer that serves to bind the fibers and then processed into the desired shape. Fiber-reinforced plastics can be classified into carbon fiber-reinforced plastics, glass fiber-reinforced plastics, aramid fiber-reinforced plastics, hybrid reinforced plastics, and the like, depending on the type of fiber. The fiber reinforced plastic has the excellent characteristics of high tensile strength, light weight, corrosion resistance, no magnetism, fatigue resistance, easy processing and the like. Among them, the fiber reinforced plastic bar may be made in the shape of a general reinforcing bar, and is considered as a possible substitute material for the reinforcing bar. The tensile strength of the carbon fiber precursor in the fiber direction can reach 2-3 times of that of steel, and the carbon fiber precursor has high antimagnetic and radiation-proof performance and is used for stealth airplanes, antimagnetic and radiation-proof engineering in military industry production. The fiber reinforced plastic is widely applied as a novel building material with development potential and a technology in important engineering knots with high requirements on service environment, durability, fatigue resistance and the like.
According to the patent (the fiber reinforced plastic-fiber grating composite sensing rib) (CN 1208653C), the fiber grating and the fiber reinforced plastic are compounded to form the fiber reinforced plastic-fiber grating sensing rib, the self-sensing nonlinearity problem of the fiber reinforced plastic is solved, the fiber reinforced plastic is excellent packaging protection of the fiber grating, the requirement that the bare fiber grating is difficult to adapt to the extensive construction of a reinforced concrete structure is overcome, and the durability of the fiber grating is greatly improved. However, a single-core fiber grating can only perform strain measurement, and different types of other sensors (such as a thermometer, an acceleration sensor, and the like) need to be respectively arranged for measuring other parameters at a monitoring position, so that the complexity and the monitoring cost of a multi-parameter monitoring system are increased.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a simple structure, convenient to use both can replace or partly replace the reinforcing bar as the atress component, also possesses the fiber reinforced plastics-multicore optic fibre composite sensing muscle of many parameter intelligent sensing characteristic.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
the utility model provides a compound muscle of multicore optic fibre intelligence, includes many fiber reinforced plastic muscle and the armor line of cladding outside many fiber reinforced plastic muscle, its characterized in that: at least one of the fiber reinforced plastic ribs is replaced by an optical fiber composite drawing rib containing a multi-core optical fiber, the optical fiber composite drawing rib comprises the multi-core optical fiber and reinforcing fibers wrapping the periphery of the multi-core optical fiber, and the multi-core optical fiber and the reinforcing fibers on the periphery of the multi-core optical fiber are fixedly connected through thermosetting resin.
As an improvement, thermosetting resin is filled between the plurality of fiber reinforced plastic ribs and between the fiber reinforced plastic ribs and the optical fiber composite drawn ribs.
As an improvement, the multicore fiber has 3 to 9 fiber cores.
As an improvement, the multi-core optical fiber is a seven-core optical fiber, and comprises a pair of distributed strain sensing optical fibers, a pair of point type strain sensing optical fibers, a distributed vibration sensing optical fiber, a distributed temperature sensing optical fiber and a high-sensitivity vibration sensing optical fiber, wherein the distributed temperature sensing optical fiber is positioned at the center of the seven-core optical fiber.
As an improvement, the armor wires are wrapped with a reinforcing layer.
As an improvement, optical fiber jumpers are welded at two ends of a multi-core optical fiber of the multi-core optical fiber intelligent composite rib, the multi-core optical fiber is connected with a multi-core optical fiber coupler through the optical fiber jumpers, and the multi-core optical fiber is connected with an optical fiber demodulator with a corresponding function through the multi-core optical fiber coupler.
As an improvement, the reinforced layer is a fiber reinforced layer or a metal reinforced layer.
As an improvement, sand blasting treatment is carried out outside the reinforcing layer to form a rough surface, or resin is wound outside the reinforcing layer.
As an improvement, the reinforcing fiber is one or the combination of any more of carbon fiber, glass fiber and aramid fiber.
The utility model has the advantages that:
the multi-core optical fiber of the product of the utility model is sent into the drawing die together with the fiber bundle and organically integrated through the heat treatment process. The multi-core optical fiber and the fiber reinforced plastic are well consolidated, so that the cooperative deformation between the multi-core optical fiber and the fiber reinforced plastic is ensured. The composite sensing rib has the advantages of the multi-core optical fiber and the fiber reinforced plastic, such as light weight, high strength, fatigue resistance, corrosion resistance, high sensing precision (1-2 mu epsilon), electromagnetic interference resistance, distributed or quasi-distributed sensing, absolute measurement, moisture resistance, water resistance, good stability and durability and the like. The composite sensing rib makes up for the respective defects of the fiber reinforced plastic and the multi-core optical fiber, for example, the multi-core optical fiber overcomes the self-sensing nonlinearity problem of the fiber reinforced plastic rib; the fiber reinforced plastic is an excellent packaging protection of the multi-core optical fiber, overcomes the defect that the bare optical fiber is difficult to adapt to the requirement of extensive construction of a reinforced concrete structure, and greatly improves the durability of the multi-core optical fiber. Therefore, the requirements of the civil engineering structure on intelligent health monitoring of mechanical properties and structure are greatly met.
Drawings
Fig. 1 is the utility model discloses compound muscle cross-sectional view of multicore optic fibre intelligence.
Fig. 2 is the cross-sectional view of the fiber composite drawing rib of the present invention.
Fig. 3 is the utility model discloses compound muscle structure sketch map of multicore optic fibre intelligence.
Fig. 4 is the utility model discloses monitoring principle schematic diagram is used to compound muscle of multicore optic fibre intelligence.
Wherein: 1-multi-core optical fiber, 101-distributed strain sensing optical fiber, 102-point type strain sensing optical fiber, 103-distributed vibration sensing optical fiber, 104-distributed temperature sensing optical fiber, 105-high-sensitivity vibration sensing optical fiber, 2-tight sleeve, 3-fiber reinforced plastic rib, 4-armor wire, 5-enhancement layer, 6-optical fiber composite drawing rib, 7-multi-core optical fiber coupler and 8-multi-core optical fiber intelligent composite rib.
Detailed Description
The following detailed description of embodiments of the present invention is made with reference to the accompanying drawings and examples:
as shown in fig. 1, the multi-core optical fiber intelligent composite rib comprises a plurality of fiber reinforced plastic ribs 3 and armor wires 4 wrapping the plurality of fiber reinforced plastic ribs 3, wherein the armor wires 4 are wrapped with reinforcement layers 5, at least one of the plurality of fiber reinforced plastic ribs 3 is replaced with an optical fiber composite drawing rib 6 comprising a multi-core optical fiber 1, the optical fiber composite drawing rib 6 comprises the multi-core optical fiber 1 and reinforcement fibers wrapping the periphery of the multi-core optical fiber 1, and the multi-core optical fiber 1 and the reinforcement fibers surrounding the multi-core optical fiber 1 are fixedly connected through thermosetting resin. The fiber reinforced plastic ribs 3, the fiber reinforced plastic ribs 3 and the optical fiber composite drawing rib 6 are also filled with thermosetting resin.
As shown in fig. 2, the multi-core optical fiber 1 is a seven-core optical fiber, which includes a pair of distributed strain sensing fibers 101, a pair of point-type strain sensing fibers 102, a distributed vibration sensing fiber 103, a distributed temperature sensing fiber 104 and a high-sensitivity vibration sensing fiber 105,wherein the distributed temperature sensing fiber 104 is centrally located within the seven-core fiber. The seven-core optical fiber 1 has the following function distribution: the first is that a pair of distributed strain sensing optical fibers 101(BOTDA/BOTDR) is used for long-distance distributed composite rib strain monitoring; the second type is a pair of point type strain sensing optical fibers 102 (FBGs), wherein a plurality of fiber bragg grating measuring points are engraved for monitoring the accurate strain value of the position of the composite rib FBG; the third is a distributed vibration sensing optical fiberAnd a fourth high sensitivity vibration sensing fiber 105(MZI) for distributed vibration measurement of composite bars, whereinUsed for positioning the vibration position, MZI is used for measuring the vibration frequency; and the fifth method is that a distributed temperature sensing optical fiber 104(ROTDR) is used for monitoring composite rib distributed temperature measuring points, and the monitored temperature can be simultaneously used for compensating the temperature effect of the distributed strain optical fiber 101 and the point-type strain optical fiber 102, so that the accurate decoupling measurement of temperature and stress is realized.
In addition, the distributed temperature sensing optical fiber 104 is located at the center of the optical fiber composite drawing rib 6, and the other seven optical fibers are distributed around the distributed temperature sensing optical fiber 104, wherein a pair of distributed strain sensing optical fibers 101 is arranged by taking the distributed temperature sensing optical fiber 104 as the center, and a pair of point type strain sensing optical fibers 102 is also arranged by taking the distributed temperature sensing optical fiber 104 as the center. By utilizing the physical symmetry characteristic of the seven-core optical fiber and based on the characteristic that the outer-layer fiber core Brillouin frequency shift is sensitive to bending, the distributed three-dimensional shape sensing of the deformation of the composite rib can be realized through a specific three-dimensional reconstruction algorithm. The multi-core optical fiber 1 space division multiplexing-based hybrid system realizes the simultaneous monitoring of long-distance and distributed temperature and vibration, realizes the distributed vibration measurement in a large dynamic range, and realizes the distributed temperature and stress measurement in a large dynamic range and ultra-high precision.
The preparation method of the multi-core optical fiber intelligent composite rib 8 comprises the following specific steps:
s1 the multi-core optical fiber 1 wraps the sleeve 2, and the multi-core optical fiber 1 and the reinforced fiber such as carbon fiber, glass fiber, aramid fiber and the like soaked with epoxy resin are sent into a drawing die together, and are organically integrated through three heat treatment processes of heating, curing and cooling to form the optical fiber composite drawing rib 6, and meanwhile, the specific position of the optical fiber grating in the multi-core optical fiber 1 is marked when the optical fiber composite drawing rib 6 is discharged from the furnace.
S2, the optical fiber composite drawn rib 6 integrated with the multicore optical fiber 1 in the step S1 and the ordinary fiber reinforced plastic rib 3 are sent to a molding device after being soaked in epoxy resin, and are heated, twisted, wound and drawn to form, the armor wires 4 are coated and installed on the finished product, and are encapsulated and protected by the reinforcement layer 5, so as to form the multicore optical fiber intelligent composite rib 8, as shown in fig. 1 and fig. 3.
In the present embodiment, the armor wires 4 may be reinforcing fibers or wire mesh, and the reinforcing layer 5 may be reinforcing fibers, including but not limited to a carbon fiber layer, a glass fiber layer, and an aramid fiber layer.
In the actual processing process, in order to make the product better adhere to other materials such as concrete, the surface of the reinforcing layer 5 can be subjected to sand blasting to form a rough surface, or resin is wound outside the reinforcing layer 5. When engineering application or test needs, the formed optical fiber composite drawing rib 6 is cut into any required length, the optical fiber is stripped at the end by utilizing the anisotropy characteristic of the fiber, and the optical fiber is welded on an optical fiber jumper.
As shown in fig. 4, the pigtail of the optical fiber composite drawing rib 6 is connected to a rear-end integrated collection system, and the collection system includes a multi-core optical fiber coupler 7 for separating seven optical fibers with different functions from the multi-core optical fiber 1. After separation, are respectively interconnected with corresponding back-end acquisition devices, includingA vibration detection system (for the distributed vibration sensing optical fiber 103), a fiber grating demodulation system (for the point type strain sensing optical fiber 102), a distributed temperature sensing system (for the distributed temperature sensing optical fiber 104), and distributed strainAcquisition systems (for distributed strain sensing fiber 101) and MZI vibration detection systems (for high sensitivity vibration sensing fiber 105). From this, can will the utility model discloses the demodulation is realized to all sensing optical fibers of the compound muscle of multicore optic fibre intelligence to final analysis goes out information such as distributed strain, local strain, three-dimensional deformation, vibration disturbance, ambient temperature of sensing muscle.
The following is just the utility model discloses well multicore optic fibre 1's sensing principle is introduced briefly:
1. the distributed temperature sensing fiber 104(ROTDR) in the multi-core fiber 1 is used for the monitoring principle of the composite rib distributed temperature measuring point. The temperature sensing optical fiber adopts a Raman temperature sensing technology to carry out temperature compensation, and the Raman temperature sensing is characterized by being only sensitive to external temperature change and insensitive to stress change of the optical fiber, so that the temperature sensing optical fiber can be used as a temperature compensation scheme. In short, raman thermometry utilizes the dependence of raman scattering intensity in an optical fiber on temperature, where the anti-stokes scattering signal is more sensitive to temperature than the stokes scattering signal, and the ratio of the two scattering intensities is only temperature dependent:
wherein, Is，IAsThe intensities of the two scattered signals are respectively, and temperature demodulation can be realized only by measuring the intensities of the two scattered light according to the formula. The utility model discloses in the product, can realize the temperature sensing to compound muscle needs position.
2. The strain sensing principle of the point-mode strain sensing fiber 102 in the multi-core fiber 1. Fiber gratings are diffraction gratings that are fabricated by using a method that produces a periodic modulation of the refractive index of the core. The fiber grating can convert the wavelength lambdaB2n Λ light wave (in the formula, λ)BRepresenting the fiber grating center wavelength, n the core effective index, and Λ the grating period). External changes will cause changes in the stress, temperature, etc. of the fiber grating, which changes the center wavelength of the fiber grating. Therefore, the external measured signal is deduced by reflecting the variable of the central wavelengthA change in amount.
We assume that the effects of temperature and strain on the center wavelength are independent, and that, disregarding the effect of the center wavelength on the sensitivity, the temperature and strain together produce the following changes:
ΔλB＝αε·Δε+αT·ΔT (2)
in the formula, Δ λBMeasuring the variation of the central wavelength, wherein delta epsilon is the variation of strain of a measuring point, and delta T is the variation of temperature of the measuring point; alpha is alphaεIs the strain sensitivity coefficient; alpha is alphaTIs the temperature sensitivity coefficient. The real strain change of the obtained fiber grating measurement can be obtained after temperature compensation is carried out during the fiber grating measurement.
The utility model discloses the point type strain sensing optic fibre 102 that has fiber grating is included in multicore optic fibre 1 sensor in the product. In practical application, by collecting the change of the central wavelength of the fiber bragg grating and simultaneously utilizing the temperature sensing function of the distributed temperature sensing fiber 104(ROTDR) in the multi-core fiber 1, the effective temperature at the measurement point of the fiber bragg grating is obtained, and the temperature compensation is performed on the wavelength change of the fiber bragg grating, so that the influence of the temperature change is eliminated, and the real strain change of the measurement point of the fiber bragg grating in the multi-core fiber 1 is obtained. Therefore, strain and temperature measurement of the key measuring point of the multi-core optical fiber intelligent composite rib 8 can be realized.
3. Distributed vibration sensing optical fiber in multi-core optical fiber 1And a high sensitivity vibration sensing fiber 105(MZI) for distributed vibration measurement principles of composite bars, whereinFor locating the vibration position, MZI is used for vibration frequency measurement. The optical fiber can generate bending and stretching phenomena in the vibration process, so that the polarization state of the light transmission and guide is changed. The change of the light polarization state can be converted into the change of the light intensity by using the analyzer at the tail end of the sensing optical fiber, and the frequency and the intensity information of the vibration event can be obtained by detecting the change of the light intensity.
Claims (9)
1. The utility model provides a compound muscle of multicore optic fibre intelligence, includes many fiber reinforced plastic muscle and the armor line of cladding outside many fiber reinforced plastic muscle, its characterized in that: at least one of the fiber reinforced plastic ribs is replaced by an optical fiber composite drawing rib containing a multi-core optical fiber, the optical fiber composite drawing rib comprises the multi-core optical fiber and reinforcing fibers wrapping the periphery of the multi-core optical fiber, and the multi-core optical fiber and the reinforcing fibers on the periphery of the multi-core optical fiber are fixedly connected through thermosetting resin.
2. The multi-core optical fiber intelligent composite rib as claimed in claim 1, wherein: the plurality of fiber reinforced plastic ribs and the optical fiber composite drawing ribs are also filled with thermosetting resin.
3. The multi-core optical fiber intelligent composite rib as claimed in claim 2, wherein: the multicore fiber has 3-9 fiber cores.
4. The multi-core optical fiber intelligent composite rib of claim 3, wherein: the multi-core optical fiber is a seven-core optical fiber and comprises a pair of distributed strain sensing optical fibers, a pair of point type strain sensing optical fibers, a distributed vibration sensing optical fiber, a distributed temperature sensing optical fiber and a high-sensitivity vibration sensing optical fiber, wherein the distributed temperature sensing optical fiber is positioned at the center of the seven-core optical fiber.
5. The intelligent multi-core optical fiber composite rib as claimed in any one of claims 1 to 4, wherein: the armor wires are wrapped with a reinforcing layer.
6. The multi-core optical fiber intelligent composite rib of claim 5, wherein: and the two ends of the multi-core optical fiber intelligent composite rib are welded with optical fiber jumpers, the multi-core optical fiber is connected with the multi-core optical fiber coupler through the optical fiber jumpers, and the multi-core optical fiber is connected with the optical fiber demodulator with the corresponding function through the multi-core optical fiber coupler.
7. The multi-core optical fiber intelligent composite rib of claim 5, wherein: the reinforced layer is a fiber reinforced layer or a metal reinforced layer.
8. The multi-core optical fiber intelligent composite rib of claim 5, wherein: and carrying out sand blasting treatment outside the reinforcing layer to form a pitted surface, or winding resin outside the reinforcing layer.
9. The multi-core optical fiber intelligent composite rib of claim 5, wherein: the reinforcing fiber is one of carbon fiber, glass fiber and aramid fiber.
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| CN109901272A (en) * | 2019-04-15 | 2019-06-18 | 武汉地震工程研究院有限公司 | A kind of multi-core optical fiber Intelligent Composite muscle, preparation method and safety monitoring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109901272A (en) * | 2019-04-15 | 2019-06-18 | 武汉地震工程研究院有限公司 | A kind of multi-core optical fiber Intelligent Composite muscle, preparation method and safety monitoring method |
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