CN110763620A - Optical fiber Fabry-Perot sensor for monitoring corrosion of steel - Google Patents
Optical fiber Fabry-Perot sensor for monitoring corrosion of steel Download PDFInfo
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- CN110763620A CN110763620A CN201911220594.6A CN201911220594A CN110763620A CN 110763620 A CN110763620 A CN 110763620A CN 201911220594 A CN201911220594 A CN 201911220594A CN 110763620 A CN110763620 A CN 110763620A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 54
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- 238000012544 monitoring process Methods 0.000 title claims abstract description 30
- 238000005260 corrosion Methods 0.000 title claims abstract description 29
- 230000007797 corrosion Effects 0.000 title claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 36
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 31
- 239000010703 silicon Substances 0.000 claims abstract description 31
- 239000011229 interlayer Substances 0.000 claims abstract description 24
- 239000000919 ceramic Substances 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 239000000835 fiber Substances 0.000 claims description 12
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 238000002310 reflectometry Methods 0.000 claims description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010410 layer Substances 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000011155 quantitative monitoring Methods 0.000 abstract description 3
- 230000036541 health Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 13
- 230000008859 change Effects 0.000 description 5
- 238000002848 electrochemical method Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005290 field theory Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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Abstract
The invention provides an optical fiber Fabry-Perot sensor for monitoring corrosion of steel, and belongs to the technical field of structural health monitoring. The optical fiber Fabry-Perot sensor for monitoring the corrosion of steel comprises an interlayer material, a gold-plated silicon mirror, a round tube-shaped permanent magnet, a single-mode optical fiber, an optical fiber ceramic ferrule, a sealing ring and a shell. The device realizes quantitative monitoring of the corrosion degree of steel and accurately judges the durability of the structure based on the extrinsic Fabry-Perot interference principle and the magnetic attraction theory of the permanent magnet to the steel, thereby ensuring the safety of important structures. The invention has the advantages of simple structure, reasonable design, strong applicability, easy manufacture, low price, wide application prospect and wide popularization market.
Description
Technical Field
The invention belongs to the technical field of structural health monitoring, and particularly relates to an optical fiber Fabry-Perot sensor for monitoring steel corrosion.
Background
The steel has the advantages of good plasticity and toughness, high strength, good earthquake resistance, convenient manufacture and the like, so the steel is widely applied in the field of civil engineering and is one of civil engineering materials which are most applied in the world at present. However, for important engineering structures (steel structure bridges, offshore oil platforms, etc.) which are exposed to atmospheric environment for a long time, steel corrosion is one of the important factors for durability failure of the engineering structures. Therefore, the corrosion condition of structural steel must be effectively monitored, and the structural durability must be accurately judged, so that the safety of important and important structures is guaranteed, and the rapid and healthy development of national economy is promoted.
At present, methods for monitoring corrosion of steel materials can be roughly classified into electrochemical methods and non-electrochemical methods. Among them, the electrochemical methods include a half-cell potential method, a linear polarization method, an alternating current impedance method, an electrochemical noise method, and the like, and the non-electrochemical methods include an apparent inspection method, a weight loss method, an ultrasonic method, an eddy current method, an acoustic emission method, and the like. However, most of the above monitoring methods have the problems of inconvenient operation, complex monitoring process, long monitoring execution time, low monitoring accuracy and the like.
In recent years, some sensors based on optical fiber sensing technology are also used for corrosion monitoring of steel products due to the advantages of small and light optical fibers, electromagnetic interference resistance, flexible form design, real-time monitoring, networking, reliable data and the like.
Therefore, it is necessary to provide a real, effective, convenient, accurate and reliable optical fiber sensor from a new technical point of view for monitoring the corrosion condition of steel products, thereby providing an important basis for predicting the durability and service life of an engineering structure.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an optical fiber Fabry-Perot sensor for monitoring the corrosion of steel, and aims to realize quantitative monitoring of the local corrosion degree of the steel and accurately judge the durability of a structure, thereby ensuring the safety of important engineering structures.
The technical scheme of the invention is as follows:
an optical fiber Fabry-Perot sensor for monitoring steel corrosion comprises an interlayer material 1, a gold-plated silicon mirror 2, a round tube-shaped permanent magnet 3, a single-mode optical fiber 4, an optical fiber ceramic ferrule 5, a sealing ring 6 and a shell 7;
the sandwich material 1 is positioned in the shell 7 and is arranged at the bottom of the shell 7;
the gold-plated silicon mirror 2 is arranged at the central position of the upper surface of the interlayer material 1;
the round tube-shaped permanent magnet 3 is of a ring body structure, vertically pressed on the interlayer material 1 and integrally positioned in the shell 7; the gold-plated silicon mirror 2 is positioned in a cavity formed by an inner ring of the circular tube-shaped permanent magnet 3;
the single-mode optical fiber 4 is arranged in an optical fiber ceramic ferrule 5, the optical fiber ceramic ferrule 5 is positioned in a cavity formed by an inner ring of the round tube-shaped permanent magnet 3, the top end of the optical fiber ceramic ferrule 5 passes through the round tube-shaped permanent magnet 3, and the optical fiber ceramic ferrule is sealed at the top of a shell 7 through a sealing ring 6.
The gold-plated silicon mirror 2 is adhered on the interlayer material 1 by using thin epoxy resin.
The end surfaces of the single-mode optical fiber and the gold-plated silicon mirror form a Fabry-Perot resonant cavity, and when the interlayer material deforms, the cavity length of the Fabry-Perot resonant cavity is correspondingly changed.
The end surfaces of the gold-plated silicon mirror 2 and the single-mode optical fiber 4 are parallel and coaxial.
The diameter of the inner ring of the round tube-shaped permanent magnet 3 is larger than that of the gold-plated silicon mirror 2.
The reflectivity of the gold-plated silicon mirror 2 is 99%.
The shell 7 is used for packaging the sensor structure, so that the extrinsic optical fiber Fabry-Perot interference is protected, and the space between the gold-plated silicon mirror and the end face of the single-mode optical fiber is free from dust.
The working principle of the invention is as follows:
taking the steel sheet that structural steel awaits measuring as an example, the steel sheet takes place the pitting back, is corroded the position department and can produce one and corrode the pit, leads to this local steel sheet thickness t of department to change to arouse that the permanent magnet also takes place corresponding change to the magnetic attraction F of steel sheet. At the same time, the change of the magnetic attraction force F can cause the deformation delta of the interlayer material which acts on the interlayer materialdTherefore, the cavity length L of the Fabry-Perot resonant cavity of the optical fiber Fabry-Perot sensor is changed, and the interference output signal intensity I is correspondingly changed.
Optical fiber Fabry-Perot sensingThe F-P resonant cavity of the device is formed by a gold-plated silicon mirror and the end face of a single-mode optical fiber. The first reflection at the end face of the single-mode fiber is called the reference light reflection and the deformation delta of the interlayer materialdIrrelevant; the second reflection of the gold-coated silicon mirror is called sensing reflection and depends on the cavity length L of the Fabry-Perot resonant cavity, and the cavity length L is deformed by the interlayer material by deltadModulation of (3). The two reflected beams produce an interference pattern, and the output intensity I of the interference signal can be represented in the form of a sine wave:
in the formula I1And I2The reflected light intensities of the end face of the single-mode optical fiber and the gold-plated silicon mirror are respectively; n is the refractive index of air and takes the value of 1;
is the initial phase difference of the interference; the wavelength difference between two successive minima in the interference spectrum, defined as the Free Spectral Range (FSR), can be expressed as
In the formula, λaAnd λbAre the wavelengths corresponding to the two peaks in the interference spectrum of the extrinsic fiber fabry-perot interference. Therefore, the cavity length L can be determined by the relation (2), and the change amount Δ L of the cavity length L is also determined thereby.
Since the change in cavity length L is caused by the deformation of the interlayer material and the two changes are identical, the cavity length L is changed by the deformation of the interlayer material
Δd＝ΔL (3)
According to the constitutive relation of the interlayer material:
wherein d is the length of the sandwich material before deformation, E is the elastic modulus of the sandwich material, and A is the cross-sectional area of the sandwich material.
The magnetic attraction force F can therefore be determined by the relation (4).
From the angle of a magnetic field theory, although the formula method is simple and convenient to calculate the magnetic attraction of the permanent magnet to the steel plate, related parameters are difficult to accurately estimate, the error is large, and a numerical analysis method is required to be applied to the accurate calculation of the magnetic attraction, a numerical analysis program is applied to carry out finite element analysis, and the relation between the magnetic attraction F and the thickness t of the steel plate is accurately determined:
F＝αt (5)
wherein α is a multi-parameter relationship coefficient determined by finite element analysis.
Obtaining the magnetic attraction force F based on the relation (2), and obtaining the thickness t of the corroded steel plate according to the relation (5)1Corrosion thickness of steel plate
Δt＝t1-t0(6)
In the formula, t0Thickness of non-corroded steel sheet, t1The thickness of the steel plate after corrosion.
Therefore, based on the inventive principle, we can corrode the steel plate by the thickness ΔtThe corrosion degree of the steel plate to be tested can be judged.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention realizes quantitative monitoring of the corrosion degree of steel by monitoring the cavity length variation of the Fabry-Perot resonant cavity.
(2) The optical fiber Fabry-Perot sensor has extremely high resolution and can reach the nanometer or sub-nanometer level.
(3) The invention can monitor the steel corrosion condition of the structure without damage, thereby better managing and maintaining the engineering structure.
(4) The invention has high sensitivity and stable performance.
(5) The method has the advantages of high monitoring speed and high precision, and provides theoretical basis and test data support for the durability and service life prediction of the engineering structure.
(6) Compared with the similar optical fiber sensor, the optical fiber sensor does not need to be subjected to optical fiber fusion in the manufacturing process, and the optical fiber performance is more reliable.
(7) The invention has the advantages of simple structure, reasonable design, strong applicability, easy manufacture, low price, wide application prospect and wide popularization market.
Drawings
FIG. 1 is a perspective view of a three-dimensional configuration of a fiber Fabry-Perot sensor for steel corrosion monitoring of the present invention;
FIG. 2 is a sectional view taken along the line A-A of the fiber Fabry-Perot sensor for monitoring corrosion of steel material according to the present invention;
FIG. 3 is a cross-sectional view B-B of the fiber Fabry-Perot sensor for monitoring corrosion of steel material according to the present invention;
FIG. 4 is a schematic diagram of the placement of the optical fiber Fabry-Perot sensor for monitoring corrosion of steel material in the invention applied to actual steel plate monitoring;
in the figure: 1, an interlayer material; 2, plating a silicon mirror; 3 a circular tube-shaped permanent magnet; 4 a single mode optical fiber; 5, a fiber ceramic ferrule; 6, sealing rings; 7, a shell.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, the optical fiber Fabry-Perot sensor for monitoring corrosion of steel provided by the invention comprises an interlayer material 1, a gold-plated silicon mirror 2, a tubular permanent magnet 3, a single-mode optical fiber 4, an optical fiber ceramic ferrule 5, a sealing ring 6 and a housing 7;
the sandwich material 1 is positioned in the shell 7 and is arranged at the bottom of the shell 7;
the gold-plated silicon mirror 2 is arranged at the central position of the upper surface of the interlayer material 1;
the round tube-shaped permanent magnet 3 is of a ring body structure, vertically pressed on the interlayer material 1 and integrally positioned in the shell 7; the gold-plated silicon mirror 2 is positioned in a cavity formed by an inner ring of the circular tube-shaped permanent magnet 3;
the single-mode optical fiber 4 is arranged in an optical fiber ceramic ferrule 5, the optical fiber ceramic ferrule 5 is positioned in a cavity formed by an inner ring of the round tube-shaped permanent magnet 3, the top end of the optical fiber ceramic ferrule 5 passes through the round tube-shaped permanent magnet 3, and the optical fiber ceramic ferrule is sealed at the top of a shell 7 through a sealing ring 6.
The gold-plated silicon mirror 2 is adhered on the interlayer material 1 by using thin epoxy resin.
The end surfaces of the single-mode fiber and the gold-plated silicon mirror form a Fabry-Perot resonant cavity, and when the interlayer material deforms, the cavity length of the Fabry-Perot resonant cavity is correspondingly changed.
The end surfaces of the gold-plated silicon mirror 2 and the single-mode optical fiber 4 are parallel and coaxial.
The diameter of the inner ring of the round tube-shaped permanent magnet 3 is larger than that of the gold-plated silicon mirror 2.
The reflectivity of the gold-plated silicon mirror 2 is 99%.
The end surfaces of the gold-plated silicon mirror 2 and the single-mode optical fiber 4 form a Fabry-Perot resonant cavity, and when the interlayer material 1 deforms, the cavity length of the Fabry-Perot resonant cavity is correspondingly changed.
The shell 7 is used for packaging the sensor structure, so that the extrinsic optical fiber Fabry-Perot interference is protected, and the space between the gold-plated silicon mirror 2 and the end face of the single-mode optical fiber 4 is free from dust.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. The optical fiber Fabry-Perot sensor for monitoring the corrosion of steel is characterized by comprising an interlayer material (1), a gold-plated silicon mirror (2), a circular tube-shaped permanent magnet (3), a single-mode optical fiber (4), an optical fiber ceramic ferrule (5), a sealing ring (6) and a shell (7);
the interlayer material (1) is positioned in the shell (7) and is arranged at the bottom of the shell (7);
the gold-plated silicon mirror (2) is arranged at the central position of the upper surface of the interlayer material (1);
the round tube-shaped permanent magnet (3) is of a ring body structure, vertically pressed on the interlayer material (1), and integrally positioned in the shell (7); the gold-plated silicon mirror (2) is positioned in a cavity formed by an inner ring of the circular tube-shaped permanent magnet (3);
the single-mode optical fiber (4) is arranged in an optical fiber ceramic ferrule (5), the optical fiber ceramic ferrule (5) is positioned in a cavity formed by the inner ring of the round tube-shaped permanent magnet (3), the top end of the optical fiber ceramic ferrule passes through the round tube-shaped permanent magnet (3), and the optical fiber ceramic ferrule is sealed at the top of the shell (7) through a sealing ring (6).
2. The fiber Fabry-Perot sensor for steel corrosion monitoring according to claim 1, characterized in that the end faces of the gold-plated silicon mirror (2) and the single-mode fiber (4) are parallel and coaxial.
3. The fiber Fabry-Perot sensor for steel corrosion monitoring according to claim 1 or 2, characterized in that the diameter of the inner ring of the round tube-shaped permanent magnet (3) is larger than the diameter of the gold-coated silicon mirror (2).
4. The fiber Fabry-Perot sensor for steel corrosion monitoring according to claim 1 or 2, characterized in that the gold-plated silicon mirror (2) is stuck on the sandwich material (1) with a thin layer of epoxy resin, and its reflectivity is 99%.
5. The fiber Fabry-Perot sensor for steel corrosion monitoring according to claim 3, characterized in that the gold-plated silicon mirror (2) is stuck on the sandwich material (1) with a thin layer of epoxy resin, and its reflectivity is 99%.
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| CN201911220594.6A CN110763620A (en) | 2019-12-03 | 2019-12-03 | Optical fiber Fabry-Perot sensor for monitoring corrosion of steel |
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| CN201911220594.6A CN110763620A (en) | 2019-12-03 | 2019-12-03 | Optical fiber Fabry-Perot sensor for monitoring corrosion of steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289472A (en) * | 2020-03-11 | 2020-06-16 | 大连理工大学 | Nano-precision steel bar surface corrosion depth testing device based on Fabry-Perot optical fiber probe |
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2019
- 2019-12-03 CN CN201911220594.6A patent/CN110763620A/en active Pending
Patent Citations (7)
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| CN111289472A (en) * | 2020-03-11 | 2020-06-16 | 大连理工大学 | Nano-precision steel bar surface corrosion depth testing device based on Fabry-Perot optical fiber probe |
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