CN208140540U - A kind of D-shaped wound form polymer optical fiber corrosion sensor - Google Patents
A kind of D-shaped wound form polymer optical fiber corrosion sensor Download PDFInfo
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- CN208140540U CN208140540U CN201820214873.6U CN201820214873U CN208140540U CN 208140540 U CN208140540 U CN 208140540U CN 201820214873 U CN201820214873 U CN 201820214873U CN 208140540 U CN208140540 U CN 208140540U
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Abstract
The utility model discloses a kind of D-shaped wound form polymer optical fiber corrosion sensors, including D-shaped polymer optical fiber, D-shaped polymer optical fiber is equidistantly wrapped in the surface of reinforcing members, one end of D-shaped polymer optical fiber is used to receive the incident light of light source sending, the other end is connect with data acquisition module, D-shaped polymer optical fiber includes the external optical fiber kernel for being provided with coat, optical fiber kernel successively includes fibre core and covering from inside to outside, and cross section is provided on D-shaped polymer optical fiber in the D-shape configuration face of rule and is used to form D-shaped column structure.The utility model is using the reinforcing members with engineering steel same material, more closing to reality situation；Transducer sensitivity is good, accuracy is high, electromagnetism interference is strong, and lossless, the quantitative and on-line monitoring of reinforcement in concrete may be implemented, and takes timely measure the condition of offer for discovery corrosion early.
Description
Technical field
The utility model belongs to fiber optic sensor technology field, and in particular to a kind of D-shaped wound form polymer optical fiber corrosion
Sensor.
Background technique
Worldwide reinforcing bar lures the erosion to be considered as leading to a most important factor for concrete structure premature failure,
Reinforcement corrosion can reduce the ductility of concrete structure and can reduce its bearing capacity, such the result is that directly affecting structure
Security performance and endurance quality, more serious corrosion can also directly contribute structural damage, so as to cause great number maintenance at
This.Monitoring to Reinforcing Steel Bar In Reinforced Concrete Structure corrosion state is a major issue urgently to be resolved, if it is possible in real time
The corrosion information for grasping reinforcing bar simultaneously carries out durability evaluating to structure, so that it may as the foundation of structural strengthening, maintenance and protection,
To avoid the generation of serious accident, therefore monitoring steel bar corrosion has important practical significance.
Monitoring corrosion of steel is exactly continuous or disconnected to Corrosion Rate of Steel and certain parameter progress related with corrosion rate
Continuous measurement, while related condition is controlled according to measurement result.Its object is to disclose reinforcement corrosion process and
How solution carries out control and control effect to reinforcement corrosion, and the data that monitoring corrosion of steel obtains are that the durability evaluating of structure mentions
For important evidence, while corrosion monitoring is also the effective means of monitoring, evaluation corrosive effect.Detection/monitoring side of steel bar corrosion
There are many method, can be divided into physical measure, electrochemical assay, optical fiber corruption candle sensor monitoring method.
Physical measure mainly has damage testing method visual examination method, reinforcing bar probe weighing method, electric resistance probe method, sound emission
Method, magnetic flux Subtraction method, eddy-current method etc..Damage, measurement accuracy are low, are only used for more serious rust due to having to structure for physical measure
The reinforcing bar of erosion detects, and cannot play the reasons such as preventive effect, and this detection method is in engineering using less.
Steel bar corrosion is substantially electrochemical process, therefore electrochemical method becomes the basic skills of detection steel bar corrosion,
It is also the method for current Technical comparing maturation.Electrochemical method commonly mainly have half-cell prtential method, concrete resistivity method,
Linear polarization method.Chemical measure can only qualitatively judge the corrosion state of reinforcing bar, and measurement accuracy is low and is easy to be contained by concrete
The interference of the extraneous factors such as water rate.
Physical measure and electrochemical assay are usually periodic detection, and line fiber optical differential protection monitoring method can be online
Real-time monitoring.Line fiber optical differential protection it is light it is succinct, small in size, measurement accuracy is high, electromagnetism interference, it is corrosion-resistant, be suitable for it is hidden
The monitoring of the privileged sites such as position and danger zone is covered, therefore line fiber optical differential protection obtains in monitoring steel bar corrosion field
It is widely applied and studies.
Currently, the reinforcement corrosion fiber optic sensor developed both at home and abroad based on principle generally comprise：To corrosive environment parameter
Monitoring, " corrosion fuse ", the detection of iron rust color, spring corrosion, corrosion-sensitive metal film, reinforcement corrosion volume expansion etc..
Nineteen ninety-five, " corrosion fuse " sensing solutions of K.D.Bennett design, when principle is that fuse does not disconnect,
Fibre-optical bending, when corrosion sensor is in corrosive medium, corrosion " fuse ", which can get rusty, to attenuate and is broken, and curved fiber loses
It goes to constrain and flick, restores nature, curvature will become smaller even zero, to make to increase rapidly by the light energy of optical fiber
Add, the fuse by designing different thicknesses can reflect different degrees of corrosion condition, then pass through the corrosion of reinforcing bar and fuse
Comparative experiments is just it can be inferred that reinforcement corrosion degree and rate.Whether sensor energy reflected well corrosion " fuse " breaks
It splits, but has no response to corrosion " fuse " is unbroken there is a situation where corrosion.
1997, the ASTM committee (ASTM) in the U.S. was in the area Vermont
Embed-type method is taken on Waterbury-Duxbury bridge, is mounted with that optical fiber chloride ion corrosion monitors system, non-destructively directly
Connect monitoring Chloride Ion in Concrete osmotic concentration.Due to its signal low-response, narrow range, durability difference etc., in concrete structure
There is also many practical problems for middle utilization.
Greene J.A. in 1997 et al. designs a kind of corrosion sensor for monitoring reinforcement corrosion volume expansion, principle
It is to be wrapped up in metal sheet surface lucite plate, both ends are fixed with bolt, after metal erosion, volume expansion, bolt
Middle section metal volume expands and makes resin plate deformation that " bolster effect " occur, and disposes Fabry-Perot in resin plate outer surface
Sieve (Fabry-Perot) interferometer, due to the strain of resin plate variation synchronous with the chamber of fiber F-P cavity sensor length, using light
Electric explorer can monitor the change of optical fiber output light intensity, thus be inferred to that the degree and rate of metal erosion can be measured, it is this
Method precision is very high and repeatable.
1997, Greene J A etc. designed a kind of Optical Fiber Grating Corrosion Sensors based on pre-tensile stress relaxation, former
Reason is to use grating housing capillary metal tube, and fiber grating stretches in advance and be pasted onto metal tube both ends, therefore grating exists
Certain prestrain, after metal tube corrosion, thickness reduces, and to the pre-tensile stress relaxation that grating generates, grating strain reduces, leads to
Monitoring wave length shift process then deducibility reinforcement corrosion degree and rate are crossed, this method precision is high, and metal tube can appoint
Meaning shape, is easy production.Since grating stretches in advance, even if not corroding generation, strain also can be because of Relaxation of prestressing and epoxy
Creep and reduced, be unfavorable for the long term monitoring of reinforcement corrosion.
1998, Fuhr P.L et al. designed a kind of variation of monitoring rebar surface color to infer the sensing of reinforcement corrosion
Device.In concrete structure, reinforcement corrosion generates iron rust, and main component is ferrous oxide (rufous).Pass through in fiber end face
Discoloration of the different reagents to iron rust detects the change of reflectance spectrum signal under reinforcement corrosion and non-corrosion condition using spectroanalysis instrument
Change, to infer whether reinforcing bar corrodes.This method is simple, conveniently, but the disadvantage is that monitoring reinforcement corrosion degree is discontinuous, only
It can monitor whether iron rust generates according to preset reagent, make threshold decision, reflection early stage corrodes.
1999, Li Xueming et al. replaced the original silica clad of optical fiber using Fe-C alloy corrosion sensitive membrane.Its principle is
Covering thickness under corrosive environment effect reduces, to change the guided-wave conditions of optical fiber, detects its light energy or polarization state
The monitoring to Fe-C alloy film corrosion process can be realized in variation.This method measurement accuracy is very high, but due to coating film thickness
It is smaller, the early stage corrosion of reinforcing bar, entire corrosion process unable to monitor can only be monitored.
2006, Yan Yun and river are firm et al. directly monitored reinforcing bar volume change using FBG strain sensing principle and designs
A kind of Fiber Bragg Grating (FBG) corrosion sensor.Specific method is the surface that fiber grating is fixed on to round reinforcing bar,
After reinforcement corrosion, diameter increases, and elongation strain suffered by fiber grating will increase, and makes the reflecting light of fiber grating is long to occur
Variation, the wavelength movement by measuring fiber grating can measure reinforcement corrosion degree.This method is very direct, measurement accuracy
Height, but since the validity limit stretching strain of grating is limited, therefore monitoring range is limited, is also only used for Steel Bars in Concrete Structure
The early monitoring of corrosion.
2011, Zhao Xuefeng et al. proposed a kind of new optical fiber corruption based on Brillouin scattering and optical time domain reflectometer technology
Light up sensor, principle is after optical fiber is tightly wound several circles on the rebar surface of polishing treatment, with glue fix its two
End.To guarantee experiment effect, the optical fiber used is that anti-refractive power is fine, in addition, taking optical fiber dual to prevent optical fiber from being destroyed
Safeguard measure：It is protected in outer fiber with seepy material；Wire netting protection is set again on the outside of the pervious material bed of material.Reinforcing bar rust
Volume expansion after candle makes optical fiber tension and generates stretching strain, detects that Brillouin shift can push away by optical time domain reflectometer
Calculate the strain of optical fiber and reinforcing bar.The shortcomings that sensor is that optical fiber fixed point is easy to fall off, Optical Fiber Winding is overstocked and permeable
Material protection layer etc. also will affect the true corrosion state of reinforcing bar.
Utility model content
The technical problem to be solved by the utility model is in view of the deficiency of the prior art, provide a kind of D-shaped
Sensor and signal transmission are integrated in one by wound form polymer optical fiber corrosion sensor, and small in size, measurement accuracy is high, reliably
Property good, corrosion-resistant, electromagnetism interference, the advantages that anti lightning, the service life is long, with improve steel reinforcement corrosion sensor monitoring accuracy,
Sensitivity and reliability make it that lossless, quantitative, the on-line monitoring of reinforcement in concrete corrosion be better achieved.
The utility model uses following technical scheme：
A kind of D-shaped wound form polymer optical fiber corrosion sensor, including D-shaped polymer optical fiber, between D-shaped polymer optical fiber etc.
Away from the surface for being wrapped in reinforcing members, one end of D-shaped polymer optical fiber is used to receive the incident light of light source sending, the other end and number
Connected according to acquisition module, D-shaped polymer optical fiber includes the external optical fiber kernel for being provided with coat, optical fiber kernel from inside to outside according to
Secondary includes fibre core and covering, and cross section is provided on D-shaped polymer optical fiber in the D-shape configuration face of rule and is used to form D-shaped column
Shape structure.
Specifically, the both ends of fibre core are cylindrical-shaped structure, middle part is biconial coupling section.
Further, the fiber core radius of D-shaped column structure is 240~600 μm in the middle part of coupling section.
Further, the length of coupling section is 10~100mm.
Specifically, D-shape configuration face is arranged on any one section of D-shaped polymer optical fiber.
Specifically, the both ends of reinforcing members are separately provided for the fixed point of connection D-shaped polymer optical fiber.
Compared with prior art, the utility model at least has the advantages that：
D-shaped polymer optical fiber, is arranged in the surface of reinforcing members by a kind of D-shaped polymer optical fiber of the utility model, and D-shaped is poly-
The tensile stress for closing object light fibre is concentrated with the corrosion of reinforcing members, is changed by D-shaped polymer optical fiber D-section and is determined reinforcing members
Corrosion condition.Using the reinforcing members with engineering steel same material, more closing to reality situation；Transducer sensitivity is good, quasi-
Exactness is high, electromagnetism interference is strong, and lossless, the quantitative and on-line monitoring of reinforcement in concrete may be implemented, for discovery corrosion early
Offer condition is provided.D-shaped polymer optical fiber one end is used to receive the incident light of light source sending, and the other end is adopted with data
Collect module connection, sensor and signal transmission are integrated in one, small in size, measurement accuracy is high, and good reliability is corrosion-resistant, anti-electricity
Magnetic disturbance, anti lightning, the service life is long, and the research in terms of civil engineering at present and utilization are relatively broad, and D-shaped polymer optical fiber includes
Outside is provided with the optical fiber kernel of coat, and optical fiber kernel successively includes fibre core and covering from inside to outside, and structure is simple, materials side
Just, be easy production, it is low in cost, be suitble to produce in enormous quantities, polymer optical fiber transducer sensitivity by temperature, strain etc. the external world because
The influence of element is very big, the working principle of sensing be by along inside of optical fibre multiple attenuation total internal reflection, in fibre-optical probe and
In the interface of external environment, the electric field of a decaying, referred to as decaying wave are formd.The variation of ambient refractive index influences whether to decay
The intensity of field.There is different evanescent fields by the different mode of spread fiber, this refers to the light field in core external radiation.With mould
The increase of state, asymptotic field will will increase, and therefore, high order mode has bigger optical power distribution in asymptotic area.
Further, radius is 240~600 μm in D-shaped coupling section, the experiment proved that, the radius of D-shaped coupling section is got over
Sluggishness is higher, and D-shape configuration zone length L is longer, and sensitivity is higher.
Further, D-shaped polymer optical fiber is equidistantly wrapped on reinforcing members, is fixed by fixed point and reinforcing members
Connection, sensor lay convenient, simple to install, are easy to multiple sensor clusters realizing the general corrosion to reinforcing bar in structure
Real-time monitoring.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Detailed description of the invention
Fig. 1 is the utility model D-shaped polymer optical fiber the schematic diagram of the section structure；
Fig. 2 is the utility model sensor structure schematic diagram.
Wherein：1. fibre core；2. covering；3. coat；4.D shape polymer optical fiber；5. reinforcing members；6. fixed point.
Specific embodiment
In the description of the present invention, it should be understood that term " center ", "left", "right", "inner", "outside", " one
The orientation or positional relationship of the instructions such as side ", " one end " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of retouching
State the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with
Specific orientation construction and operation, therefore should not be understood as limiting the present invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.
The mechanism and feature of reinforcement in concrete corrosion：
Reinforcing bar is in overbasic environmental condition, and there are one layer of fine and close, molecules and ion to be difficult to across film, i.e., on surface
" passivating film " prevents reinforcing bar from further aoxidizing, corroding.But when Chloride Attack (seawater or villaumite etc.), chloride ion passes through
The intrinsic hole of concrete and microcrack reach rebar surface, and are adsorbed in part passivation film surface, reduce the pH value at this,
To make rebar surface passivating film be dissolved, destroy, corrosion cell is formd in rebar surface, so that rebar surface generates part
Corrosion, then, the appearance of more localized pits start to be covered with rebar surface so that corroding, and finally result in reinforcing bar whole surface
There is spalling in corrosion, concrete, further quickening reinforcement corrosion.The embroidery candle bulk product that steel bar corrosion generates expands again and is
Loose laminated structure, this reduces the sectional area of one side reinforcing bar, and intensity and ductility reduce；The protection of another aspect concrete
Layer because the corrosion of reinforcing bar and the case where generate cracking, fall off so that the effective sectional area of concrete becomes smaller, at the same reinforcing bar with mix
The adhesive property for coagulating soil reduces or loses.
The utility model provides a kind of D-shaped wound form polymer light fiber sensor for monitoring corrosion of steel, utilizes
Steel bar corrosion volume expansion principle, when sensor is in corrosive environment, the embroidery candle bulk product that steel bar corrosion generates expands, and two
It holds fixed optical fiber to be close to reinforcing members, can be deformed together with reinforcing bar, optical fiber is passed through optical fiber by tensile stress, detection
Intensity variation, and then the degree and rate of reinforcement corrosion can be monitored in real time.
The basic principle of fiber work：
Total reflection phenomenon based on light, according to geometric optical theory, all light propagations follow Si Nieer (snell) original
Reason.Due to fiber core refractive index n1Greater than cladding index n2, the condition of inner full-reflection is to meet critical angle θ0。
Wherein, n1, n2It is fibre core and the respective refractive index of covering, θ0It is relative to shaft axis of optic fibre.
When the light required travels to optical fibre interface, according to Fresnel reflections law it is found that incidence angle is greater than critical angle
When, incident light will not reflect, and be reflected towards preceding propagation all along fibre core.Therefore, the electricity that optical fiber can will occur in the form of light
Magnetic wave energy is constrained in its fibre core using the principle of total reflection, and light wave is guided to advance along the direction of shaft axis of optic fibre.
Referring to Fig. 1, the utility model is used for the D-shaped wound form polymer light fiber sensor of monitoring corrosion of steel, including D
The surface of reinforcing members 5 is arranged in shape polymer optical fiber 4, D-shaped polymer optical fiber 4, is equidistantly wrapped on reinforcing members 5, leads to
It crosses and is distributed in the fixed point 6 at 5 both ends of reinforcing members and is fixedly connected with reinforcing members 5.
D-shaped polymer optical fiber 4 includes fibre core 1, covering 2 and coat 3, and the side of fibre core 1 is polished into horizontal plane, with steel
Muscle element 5 is close to setting, and the outside of fibre core 1 is arranged in covering 2, and the surface of covering 2 is arranged in coat 3.
Reinforcing members 5 are the round steel with reinforcing bar equal diameter same material used in engineering, the length is π times of round steel radius, two
Circular section paint spraying is held, fixed point 6 runs through the both ends that reinforcing members 5 are arranged in.
Volume becomes larger so that the tensile stress that D-shape configuration optical fiber is subject to more is concentrated after reinforcement corrosion, and D type section becomes smaller, and leads to
The light loss for crossing optical fiber increases.
The expression formula of description fiber mode number is defined as V value, specific as follows：
Wherein, λ represents the wavelength of light source；R represents the effective radius of fibre core；n1Represent the refractive index of fibre core；n2Represent the external world
The refractive index of environment.
D-shaped polymer optical fiber it is specific the production method is as follows：
S1, D-shaped polymer optical fiber include optical fiber kernel and coat 3, and optical fiber kernel is made of fibre core 1 and covering 2, selection
Any one section on fibre-optical probe, coat 3 is removed with wire stripper；
S2, the side for removing exposed 1 surface of fibre core after coat 3 polish with sand paper back and forth until formation D-shaped column and
The uniform D-shape configuration face of diameter thickness, the side where arc of then being polished back and forth with sand paper, main purpose is exactly to remove fibre core
Surrounding layer 2；
It is carefully polished with 320 model sand paper on exposed 1 surface of fibre core.By the way of the polishing of unilateral side, guarantee the D-shaped of processing
Structure division section keep even thickness, central area can be used thick level-one it is levigate after again with fine sandpaper repeat polish smooth, beat
Vernier caliper measurement central area size can be used during mill at any time, controls D-shape configuration length, sectional dimension convenient for accurate,
Until forming even thickness and meeting the D-shape configuration face of aimed dia size, 1 radius of fibre core in the area DXing Zhui in the middle part of coupling section
It is 240~600 μm, the central area radius more sluggishness of D-shaped coupling section is higher.D-shaped coupling section length L can 10~
Between 100mm.
S3, it is cleaned using isopropanol to the D domain to be formed is completed the process.
D-shaped polymer light fiber sensor is wrapped on reinforcing members, and reinforcing members are in corrosive environment.Light source issue into
Penetrate one end that light enters optical fiber, the other end connects data acquisition module, after reinforcement corrosion volume become larger so that D-shape configuration optical fiber by
To tensile stress more concentrate, D-section becomes smaller, and is increased by the light loss of optical fiber.It is logical using data acquisition module real-time monitoring
The case where variation for crossing fiber light level, is depicted as curve graph, can be with indirect reaction reinforcement corrosion.
The above content is only to illustrate the technical idea of the utility model, and the protection model of the utility model cannot be limited with this
Enclose, it is all according to the utility model proposes technical idea, any changes made on the basis of the technical scheme each falls within this reality
Within protection scope with novel claims.
Claims (6)
1. a kind of D-shaped wound form polymer optical fiber corrosion sensor, which is characterized in that including D-shaped polymer optical fiber (4), D-shaped is poly-
The surface that object light fine (4) is equidistantly wrapped in reinforcing members (5) is closed, one end of D-shaped polymer optical fiber (4) is for receiving light source hair
Incident light out, the other end are connect with data acquisition module, and D-shaped polymer optical fiber (4) includes that outside is provided with coat (3)
Optical fiber kernel, optical fiber kernel include successively from inside to outside fibre core (1) and covering (2), are provided on D-shaped polymer optical fiber (4)
Cross section is used to form D-shaped column structure in the D-shape configuration face of rule.
2. a kind of D-shaped wound form polymer optical fiber corrosion sensor according to claim 1, which is characterized in that fibre core (1)
Both ends be cylindrical-shaped structure, middle part be biconial coupling section.
3. a kind of D-shaped wound form polymer optical fiber corrosion sensor according to claim 2, which is characterized in that coupled zone
Fibre core (1) radius of section middle part D-shaped column structure is 240~600 μm.
4. a kind of D-shaped wound form polymer optical fiber corrosion sensor according to claim 2, which is characterized in that coupled zone
The length of section is 10~100mm.
5. a kind of D-shaped wound form polymer optical fiber corrosion sensor according to claim 1, which is characterized in that D-shape configuration
Face is arranged on any one section of D-shaped polymer optical fiber (4).
6. a kind of D-shaped wound form polymer optical fiber corrosion sensor according to claim 1, which is characterized in that reinforcing bar member
The both ends of part (5) are separately provided for the fixed point (6) of connection D-shaped polymer optical fiber (4).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181229A (en) * | 2018-02-07 | 2018-06-19 | 西安交通大学 | D-shaped wound form polymer optical fiber corrosion sensor and its preparation method and application |
| CN109610735A (en) * | 2018-12-28 | 2019-04-12 | 东南大学 | It is a kind of distributed from monitoring prestressing force composite reinforcing based on long gauge length optical fibre grating |
| CN114264591A (en) * | 2021-12-23 | 2022-04-01 | 中国兵器工业第五九研究所 | Device and method for evaluating corrosion appearance of metal standard part |
| CN109610735B (en) * | 2018-12-28 | 2024-05-14 | 东南大学 | Distributed self-monitoring prestress composite bar based on long gauge length fiber bragg grating |
-
2018
- 2018-02-07 CN CN201820214873.6U patent/CN208140540U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181229A (en) * | 2018-02-07 | 2018-06-19 | 西安交通大学 | D-shaped wound form polymer optical fiber corrosion sensor and its preparation method and application |
| CN108181229B (en) * | 2018-02-07 | 2024-04-05 | 西安交通大学 | D-shaped winding type polymer optical fiber corrosion sensor and preparation method and application thereof |
| CN109610735A (en) * | 2018-12-28 | 2019-04-12 | 东南大学 | It is a kind of distributed from monitoring prestressing force composite reinforcing based on long gauge length optical fibre grating |
| CN109610735B (en) * | 2018-12-28 | 2024-05-14 | 东南大学 | Distributed self-monitoring prestress composite bar based on long gauge length fiber bragg grating |
| CN114264591A (en) * | 2021-12-23 | 2022-04-01 | 中国兵器工业第五九研究所 | Device and method for evaluating corrosion appearance of metal standard part |
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