CN114152630A - Intelligent coating monitoring system and application thereof - Google Patents
Intelligent coating monitoring system and application thereof Download PDFInfo
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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Abstract
The invention provides an intelligent coating monitoring system and application thereof, and belongs to the field of anticorrosive coatings. The intelligent coating monitoring system comprises a laser emission device, a fiber bragg grating sensor and an intelligent monitoring platform, wherein the laser emission device is connected with the fiber bragg grating sensor and used for inputting pulse signals to the fiber bragg grating sensor; when in use, the fiber grating sensor is fixed in the coating and generates a reflected light signal; the intelligent monitoring platform is used for collecting reflected light signals so as to monitor whether the coating is damaged or not in real time. This intelligent coating monitoring system imbeds fiber grating sensor in the coating inside to be connected fiber grating sensor and laser emission device and intelligent monitoring platform, when coating stress state changes, the grating that optic fibre and optic fibre inside receive stress effect to produce and be met an emergency and make the laser signal of grating department change to some extent, can the change of strain state of real-time supervision whole coating through intelligent monitoring platform, thereby the appearance of crackle or defect on the whole coating of real-time supervision.
Description
Technical Field
The invention belongs to the field of anticorrosive coatings, and particularly relates to an intelligent coating monitoring system and application thereof.
Background
The metal material has wide application in life and is an important material indispensable to human life. However, due to the characteristic of non-corrosion resistance, a large amount of metal materials damage corresponding traffic equipment and mechanical equipment due to corrosion failure, thereby causing huge economic loss. Therefore, the process of slowing down the corrosion of the metal can bring great economic benefits. The methods for preventing metal corrosion are various, wherein the method for spraying the anti-corrosion coating on the metal surface is a method which is simple and convenient to operate and wide in application. Because the coating is coated on the surface of the material and the structure is single and thin, cracks or breakage often occur due to external adverse conditions, and the protective effect on the metal material is lost. Since the coating is a protective consumable and the coverage area is large, it is often difficult to find fine failure sites. Therefore, the intelligent coating is developed, so that people can find and repair the position of the coating with possible defects in time, the exposure risk of the base material is reduced as much as possible, and the damage to the base material caused by corrosion can be greatly reduced.
In the prior art, CN112852262A discloses an anticorrosion self-repair coating containing lignocellulose and a preparation method thereof, wherein the self-repair coating comprises a bottom layer, a middle layer and a top layer which form a sandwich-type composite layer structure, and the middle layer comprises a self-repair system material and an epoxy resin base material. CN112552778A discloses a self-detection and self-repair intelligent coating containing microcapsules, which comprises microcapsules loaded with self-detection and self-repair functional molecules, a color development initiator, a film forming matrix and an additive, wherein the microcapsules are formed by coating a repair agent and color development agent molecules with a shell material. However, both of them are to cover the base coating with an organic coating layer having the above-mentioned functions, and are limited by the material types of the organic coating layer, and the coating layer is not suitable for some working materials under severe environment (high temperature and high pressure). Therefore, designing a monitoring structure without changing the original coating material types can find out the coating damage in time, which is an important direction for future development.
CN103163142A discloses an optical fiber measuring device, wherein one end of an optical fiber line is connected to an optical fiber communication measuring instrument, the center of the optical fiber line is a glass core with high refractive index, the outer layer of the glass core is a silica glass cladding with low refractive index, and the outermost layer is a resin coating. The monitoring principle is mainly to sense the defects in cracks and crazes through the deformation or breakage of the optical fiber, the detection precision is relatively poor, and the method is not suitable for coating monitoring. CN212432979U discloses an optical fiber sensor for monitoring aging and peeling of a steel structure coating, wherein a single-mode fiber is polished to remove a part of cladding on one side of a groove of a flexible sheet, the region is a polished region and covered by an iron film, a non-polished region is covered by the flexible sheet, and based on the high sensitivity of a side polished fiber to the refractive index of an external environment, quantitative monitoring of the peeling state of the coating is realized by monitoring the change of brillouin frequency shift of the side polished fiber. However, the monitoring range of the method is limited by the position of the iron thin film, and the device cannot effectively monitor the iron thin film when the iron thin film falls off from a local position, so that the monitoring range is limited.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an intelligent coating monitoring system and application thereof, which can detect the coating defects in real time on the premise of not changing the types of the existing coating materials and aims to solve the existing problems.
In order to achieve the above object, according to an aspect of the present invention, an intelligent coating monitoring system is provided, which includes a laser emitting device, a fiber grating sensor and an intelligent monitoring platform, wherein the laser emitting device is connected to the fiber grating sensor and is configured to input a pulse signal to the fiber grating sensor; when in use, the fiber bragg grating sensor is fixed in the coating and generates a reflected light signal; the intelligent monitoring platform is used for collecting the reflected light signals so as to monitor whether the coating is damaged or not in real time.
Preferably, the intelligent coating monitoring system further comprises a circulator, wherein a first port of the circulator is connected with the laser emission device, a second port of the circulator is connected with the fiber bragg grating sensor, and a third port of the circulator is connected with the intelligent monitoring platform to ensure unidirectional signal transmission.
As a further preferred, the laser emitting device is used for inputting a trigger pulse signal.
Preferably, the intelligent monitoring platform judges whether the coating is damaged or not according to the central wavelength drift amount of the reflected light signal.
Preferably, the intelligent monitoring platform comprises a filter, a signal detection and processing module and an early warning module, wherein the filter is connected with a third port of the circulator and is used for collecting reflected light signals; the signal detection and processing module obtains strain information according to the reflected light signal; and the early warning module carries out damage early warning according to the strain information.
As a further preferred example, the work flow of the intelligent monitoring platform is as follows:
s1, separating the effective optical signal from the reflected optical signal by using a filter and transmitting the effective optical signal to a signal detection and processing module;
the S2 signal detection and processing module converts the effective optical signal into an electric signal, demodulates the central wavelength drift amount according to the electric signal and the pulse signal of the laser emitting device, and then obtains corresponding strain according to the central wavelength drift amount and transmits the strain to the early warning module;
s3, the early warning module gives an early warning when the strain exceeds a normal range, and marks the position where the abnormality occurs.
More preferably, in step S2, the strain is calculated using the following equation:
in which ε is the strain, Δ λBIs the amount of the center wavelength drift,
is the effective refractive index of the core, P12And P11The component of the fiber strain tensor, v is the poisson ratio constant of the core material, and Λ is the grating grid period.
Preferably, the fiber grating sensors are embedded in the coating in an array arrangement.
According to another aspect of the invention, an intelligent coating is provided, which comprises a composite coating structure, a laser emission device and an intelligent monitoring platform, wherein the composite coating structure comprises a coating and a fiber grating sensor embedded in the coating, and the laser emission device is connected with the fiber grating sensor and used for inputting pulse signals to the fiber grating sensor; the intelligent monitoring platform is used for collecting reflected light signals generated by the fiber bragg grating sensor so as to monitor whether the coating is damaged or not in real time.
Preferably, a coating with a preset thickness is sprayed on the substrate by magnetron sputtering, chemical vapor deposition and thermal spraying to serve as an optical fiber supporting layer; then laying fiber bragg grating sensors as fiber sensing layers on the fiber supporting layers in an array mode; and finally, manufacturing a coating with preset thickness on the optical fiber sensing layer by using a cold spraying technology so that the optical fiber grating sensor is completely embedded into the coating.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
1. the invention provides an intelligent coating monitoring system, which is characterized in that a fiber grating sensor is embedded in a coating, the fiber grating sensor is connected with a laser emission device and an intelligent monitoring platform, when the strain state of the coating is changed, the fiber and the grating in the fiber are stressed to change the laser signal at the grating, the strain state change of the whole coating can be monitored in real time through the intelligent monitoring platform, so that the appearance of cracks or defects on the whole coating can be monitored in real time, the function of self-detecting the defects of the coating can be realized on the premise of not changing the type of the original coating material, and the damage repair can be carried out in time conveniently;
2. meanwhile, the circulator is arranged, so that the laser signal can be efficiently transmitted along a single direction, and the interference of the reflected signal on the laser emitting device or the intelligent monitoring platform is avoided;
3. particularly, the invention optimizes the composition and the working mode of the intelligent monitoring platform, can efficiently monitor the strain state of the coating in real time, finds out the damage of the coating appearing in the early stage and repairs the coating in time, reduces the long-time exposure risk of the base material, delays the loss of the base material and can bring great economic benefit.
Drawings
FIG. 1 is a schematic diagram of an intelligent coating monitoring system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a smart coating provided by an embodiment of the present invention;
fig. 3 is a schematic diagram of the installation of the fiber grating sensor in the intelligent coating according to the embodiment of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
the system comprises a laser emitting device 1, a circulator 2, a composite coating structure 3, an intelligent monitoring platform 4, a fiber grating sensor 5, a coating 6, a substrate 7, a filter 8, a signal detection and processing module 9 and an early warning module 10.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the present invention provides an intelligent coating monitoring system, which includes a laser emitting device 1, a fiber grating sensor 5 and an intelligent monitoring platform 4, wherein the laser emitting device 1 is connected to the fiber grating sensor 5, and is configured to input a pulse signal to the fiber grating sensor 5, and preferably a trigger pulse signal; when in use, the fiber grating sensor 5 is embedded in the coating in an array arrangement mode and generates a reflected light signal; the intelligent monitoring platform 4 is used for collecting the reflected light signals and judging whether the coating is damaged or not according to the central wavelength drift amount of the reflected light signals.
Further, the intelligent coating monitoring system further comprises a circulator 2, a first port of the circulator 2 is connected with the laser emitting device 1, a second port of the circulator 2 is connected with the fiber bragg grating sensor 5, and a third port of the circulator 2 is connected with the intelligent monitoring platform 4. Circulator 2 can make laser signal along one-way high-efficient propagation, and the signal of following first port input can be at the second port with extremely low loss output, and the signal of following the input of second port can be at the third port with extremely low loss output, otherwise, the signal almost can't pass through to avoid reflection signal to cause the interference to laser emission device 1 or intelligent monitoring platform 4.
Further, the intelligent monitoring platform 4 comprises a filter 8, a signal detection and processing module 9 and an early warning module 10, wherein the filter 8 is connected with a third port of the circulator 2 and is used for collecting reflected light signals; the signal detection and processing module 9 obtains strain information according to the reflected light signal; and the early warning module 10 carries out damage early warning according to the strain information.
Further, the work flow of the intelligent monitoring platform 4 is as follows:
s1, separating the effective optical signal from the reflected optical signal by using the filter 8 and transmitting the effective optical signal to the signal detection and processing module 9;
the S2 signal detecting and processing module 9 converts the effective optical signal into an electrical signal, demodulates the central wavelength drift amount according to the electrical signal and the pulse signal of the laser emitting device, and then obtains the corresponding strain according to the central wavelength drift amount and transmits the strain to the early warning module 10;
the S3 early warning module 10 performs early warning when the strain exceeds the normal range, and because the reflected light signal wave peaks obtained by different gratings have a sequence in appearance time, the early warning module 10 can find the corresponding abnormal position of the grating according to the position of the shifted wave peak appearing on the time spectrum, thereby marking the position of the coating state abnormality.
Further, as can be seen from the central wavelength formula (1) of the Braag grating in step S2,
λB＝2neffΛ (1)
central wavelength lambda of gratingBEffective refractive index of following fiber core
And the variation of the grating period Lambda of the fiber grating, when the grating period of the fiber grating and the effective refractive index of the fiber core are varied, the variation Delta Lambda of the grating period of the fiber grating and the variation Delta n of the effective refractive index of the fiber core are generatedeffThe reflected central wavelength will produce a central wavelength shift Δ λBAnd has:
in the formula, when strain information is required, according to the relation that the effective refractive index of the optical fiber changes along with strain:
in the formula, P12And P11The component of the fiber strain tensor, v is the Poisson's ratio constant of the fiber core material, epsilon is the strain, and the relation between the fiber grating grid period variation delta lambda and the strain variation lambda epsilonComprises the following steps:
ΔΛ＝Λε (4)
the compounds of formulae (3) and (4) can be substituted for formula (2):
wherein, PeIs the effective elasto-optic coefficient of the fiber,
Kεin order to be the strain sensitivity coefficient,
Kε＝(1-Pe)λB (7)
central wavelength drift delta lambdaBThe relationship with the strain epsilon is that,
ΔλB＝Kεε (8)
therefore, the monitoring platform can convert the wavelength change of the reflection center into the strain change according to the formula (8) and feed back the strain change in real time, and finally the following results are obtained:
in the above formula P11、P22、v、neffAre dependent on the fibre material used and when the material used is determined, the value of the parameter is determined.
The working principle of the intelligent coating monitoring system provided by the invention is as follows: the laser emitting device 1 inputs a trigger pulse signal, the trigger pulse signal is injected into a fiber grating sensor 5 which is fastened in a coating 6 through a circulator 2 and used for sensing strain change, the trigger pulse signal can generate a reflected light signal in the fiber grating sensor 5, the reflected light signal is acquired by an intelligent monitoring platform 4 through the circulator 2, when a crack is generated at a certain position of the coating 6, the fiber grating sensor near the crack generates micro-deformation due to the influence of crack stress, the micro-deformation can change the reflected light signal generated at the position, and the intelligent monitoring platform 4 can acquire crack information of the coating in real time. The early warning module 10 can set a normal strain range value, and when the strain information received by the signal detection and processing module 9 exceeds the normal range, the early warning module 10 can give out early warning to mark the position where the abnormality occurs, so that the position where the coating is defective can be timely noticed and repaired, and the risk that the base material 7 is exposed for a long time is reduced.
The intelligent coating monitoring system provided by the invention is not limited by the material type and application scene of the coating, does not influence various performances of the coating, and can adapt to most coating application environments. Meanwhile, other damaged color developing materials or repairing materials are not introduced into the intelligent coating monitoring system, so that the intelligent coating monitoring system is environment-friendly and pollution-free.
According to another aspect of the present invention, an intelligent coating is provided, which comprises a composite coating structure 3, a laser emission device 1 and an intelligent monitoring platform 4, wherein the composite coating structure 3 comprises a coating 6 and a fiber grating sensor 5 embedded in the coating 6, and the laser emission device 1 is connected with the fiber grating sensor 5 and is used for inputting pulse signals to the fiber grating sensor 5; the intelligent monitoring platform 4 is used for collecting the reflected light signals generated by the fiber grating sensor 5 so as to monitor whether the coating is damaged or not in real time.
Further, a coating 6 with a proper thickness is sprayed on the substrate 7 by magnetron sputtering, chemical vapor deposition and thermal spraying to serve as an optical fiber supporting layer; then laying fiber bragg grating sensors 5 on the fiber supporting layer in an array mode to serve as fiber sensing layers; and finally, manufacturing a coating 6 with a preset thickness on the optical fiber sensing layer by using a cold spraying technology, so that the optical fiber grating sensor 5 is completely embedded into the coating 6. The optical fiber grating sensor 5 is internally provided with the optical grating, the optical fiber grating sensor 5 is embedded in the coating 6 in an exposed manner, when a certain part of the coating 6 is deformed or cracked, the optical fiber grating sensor 5 and the optical grating in the adjacent area are slightly deformed under the stress action, and further strain is generated, so that the optical signal passing through the optical fiber grating sensor 5 is changed.
The fiber grating sensor 5 is in the coating 6 as shown in fig. 3The array is a stress distribution type sensing scheme with good effect. When a micro-crack occurs in a certain area of the coating, the stress σ of the fiber grating sensor 5 near the area isbThe other part being normal σaResulting in a stress of σbPart of the optical fiber is deformed abnormally and affects the grating in the optical fiber, so that the central wavelength drift amount of the reflected optical signal generated by the part of the optical fiber is changed, and the intelligent monitoring platform 4 can judge whether the coating is damaged or not by monitoring the change.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An intelligent coating monitoring system is characterized by comprising a laser emission device (1), a fiber grating sensor (5) and an intelligent monitoring platform (4), wherein the laser emission device (1) is connected with the fiber grating sensor (5) and is used for inputting pulse signals to the fiber grating sensor (5); the fiber bragg grating sensor (5) is fixed in the coating when in use and generates a reflected light signal; the intelligent monitoring platform (4) is used for collecting the reflected light signals so as to monitor whether the coating is damaged or not in real time.
2. The intelligent coating monitoring system according to claim 1, further comprising a circulator (2), wherein a first port of the circulator (2) is connected with the laser emitting device (1), a second port of the circulator (2) is connected with the fiber grating sensor (5), and a third port of the circulator (2) is connected with the intelligent monitoring platform (4) to ensure unidirectional signal transmission.
3. The smart coating monitoring system according to claim 1 wherein the laser emitting device (1) is adapted to input a trigger pulse signal.
4. The intelligent coating monitoring system of claim 1, wherein the intelligent monitoring platform (4) determines whether the coating is damaged based on an amount of shift in the center wavelength of the reflected optical signal.
5. The intelligent coating monitoring system according to claim 1, wherein the intelligent monitoring platform (4) comprises a filter (8), a signal detection and processing module (9) and a pre-warning module (10), wherein the filter (8) is connected to a third port of the circulator (2) for collecting reflected light signals; the signal detection and processing module (9) obtains strain information according to the reflected light signal; and the early warning module (10) carries out breakage early warning according to the strain information.
6. The intelligent coating monitoring system of claim 1, wherein the workflow of the intelligent monitoring platform (4) is:
s1, separating the effective optical signal in the reflected optical signal by using a filter (8) and transmitting the effective optical signal to a signal detection and processing module (9);
the S2 signal detection and processing module (9) converts the effective optical signal into an electric signal, demodulates the central wavelength drift amount according to the electric signal and the pulse signal of the laser emitting device (1), and then obtains the corresponding strain according to the central wavelength drift amount and transmits the strain to the early warning module (10);
s3, the early warning module (10) gives an early warning when the strain exceeds a normal range, and marks the abnormal position.
7. The smart coating monitoring system of claim 6 wherein in step S2, the strain is calculated using the formula:
in which ε is the strain, Δ λBAmount of shift of center wavelength，neffIs the effective refractive index of the core, P12And P11Is the component of the fiber strain tensor, v is the poisson ratio constant of the core material, and Λ is the grating grid period.
8. The intelligent coating monitoring system according to any one of claims 1 to 7, wherein the fiber grating sensors (5) are embedded inside the coating in an array arrangement.
9. An intelligent coating is characterized by comprising a composite coating structure (3), a laser emission device (1) and an intelligent monitoring platform (4), wherein the composite coating structure (3) comprises a coating (6) and a fiber grating sensor (5) embedded in the coating (6), and the laser emission device (1) is connected with the fiber grating sensor (5) and used for inputting pulse signals to the fiber grating sensor (5); the intelligent monitoring platform (4) is used for collecting reflected light signals generated by the fiber grating sensor (5) so as to monitor whether the coating is damaged or not in real time.
10. The smart coating according to claim 9, wherein a coating (6) with a preset thickness is sprayed on the substrate (7) as a fiber supporting layer by means of magnetron sputtering, chemical vapor deposition and thermal spraying; then laying fiber bragg grating sensors (5) as fiber sensing layers on the fiber supporting layer in an array mode; and finally, manufacturing a coating (6) with a preset thickness on the optical fiber sensing layer by using a cold spraying technology, so that the optical fiber grating sensor (5) is completely embedded into the coating (6).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114801302A (en) * | 2022-05-25 | 2022-07-29 | 华中科技大学 | Intelligent press machine with built-in deformation compensation module |
| CN116603716A (en) * | 2023-04-28 | 2023-08-18 | 宁波市融嘉轻合金科技有限公司 | Die casting surface treatment method, system, intelligent terminal and storage medium |
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