CN113008146A - Optical fiber sensing device, pipeline corrosion monitoring system and method - Google Patents
Optical fiber sensing device, pipeline corrosion monitoring system and method Download PDFInfo
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- CN113008146A CN113008146A CN202110220538.3A CN202110220538A CN113008146A CN 113008146 A CN113008146 A CN 113008146A CN 202110220538 A CN202110220538 A CN 202110220538A CN 113008146 A CN113008146 A CN 113008146A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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- Length Measuring Devices By Optical Means (AREA)
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Abstract
The embodiment of the invention discloses an optical fiber sensing device, a pipeline corrosion monitoring system and a method, wherein the optical fiber sensing device comprises: the ethylene propylene diene monomer rubber belt is tightly attached to the periphery of the pipeline and is provided with two rubber belt joints; the optical fiber sensing module is embedded in the ethylene propylene diene monomer rubber belt, two optical fiber connectors are led out from the ethylene propylene diene monomer rubber belt, and the optical fiber connectors are used for being connected with an external armored cable to transmit data; and the joint fixing structure fixes the two adhesive tape joints at the preset positions of the pipeline. The optical fiber sensing device provided by the embodiment of the invention has high measurement precision and convenient operation, can be used for carrying out real-time quantitative monitoring on the metal corrosion on the outer surface of the pipeline, and cannot damage the pipeline.
Description
Technical Field
The embodiment of the invention relates to the technical field of structure monitoring, in particular to an optical fiber sensing device, a pipeline corrosion monitoring system and a pipeline corrosion monitoring method.
Background
Due to the rapid development of engineering construction technology in China, a large number of large-scale infrastructures including a plurality of pipeline structures are built all over the country. The pipeline structure is easy to corrode after years of use, and if the pipeline corrosion condition is not monitored and maintained, great influence and economic loss can be caused, such as explosion caused by roadbed collapse, oil pipe leakage and pipeline aging.
Most of the existing methods for monitoring the corrosion of the pipeline are that a long-period fiber grating is flatly placed at a position close to the pipeline, and a spectrometer is used for observing the transmission spectrum change of the long-period fiber grating at regular intervals, so that whether the grating is bent or not is judged, and the corrosion degree and the corrosion rate of a steel bar are deduced. The monitoring method has low measurement precision, has certain problems in the packaging of the sensor, and is difficult to apply in engineering practice.
Disclosure of Invention
In view of this, embodiments of the present invention provide an optical fiber sensing device, a pipeline corrosion monitoring system and a method, so as to quantitatively measure a pipeline corrosion degree and improve a pipeline corrosion monitoring accuracy.
In a first aspect, an embodiment of the present invention provides an optical fiber sensing device, including:
the ethylene propylene diene monomer rubber belt is tightly attached to the periphery of the pipeline and is provided with two rubber belt joints;
the optical fiber sensing module is embedded in the ethylene propylene diene monomer rubber belt, two optical fiber connectors are led out from the ethylene propylene diene monomer rubber belt, and the optical fiber connectors are used for being connected with an external armored cable to transmit data;
and the joint fixing structure fixes the two adhesive tape joints at the preset positions of the pipeline.
Furthermore, the optical fiber sensing module comprises a plurality of sensors distributed along the circumferential direction of the pipeline, and the plurality of sensors are connected through optical fibers.
Further, the sensors include an FBG strain sensor, an FBG temperature sensor and a low coherence interference optical fiber sensor.
Further, the optical fiber is arranged inside the optical fiber protective sleeve.
Furthermore, the optical fiber sensing device further comprises a connector protection box, the connector protection box is fixed at the preset position of the pipeline, and the joint of the optical fiber connector and the external armored cable is arranged in the connector protection box.
Furthermore, the joint fixing structure is a bolt fixing structure, and the bolt fixing structure is arranged inside the joint protection box.
Further, bolt fastening structure includes bolt assembly and two sticky tape connecting pieces, the sticky tape connecting piece is equipped with sticky tape preformed hole, the sticky tape connects and locates in the sticky tape preformed hole.
In a second aspect, an embodiment of the present invention provides a pipeline corrosion monitoring system, including a plurality of optical fiber sensing devices and a data processing module, where the optical fiber sensing devices are connected in series through an external armored cable and then connected to the data processing module.
Furthermore, a plurality of the optical fiber sensing devices are spaced by a preset distance.
In a third aspect, an embodiment of the present invention provides a method for monitoring corrosion of a pipeline, including:
acquiring pipeline monitoring data;
determining the dependent variable of a sensor according to the pipeline monitoring data;
and determining the thickness variation of the pipeline according to the strain of the sensor.
The optical fiber sensing device provided by the embodiment of the invention has high measurement precision and convenient operation, can be used for carrying out real-time quantitative monitoring on the metal corrosion on the outer surface of the pipeline, and cannot damage the pipeline.
Drawings
Fig. 1 is a schematic structural diagram of an optical fiber sensing device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an optical fiber according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a joint fixing structure according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a tape connector according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a pipeline corrosion monitoring system according to a second embodiment of the present invention;
fig. 6 is a schematic flow chart of a pipeline corrosion monitoring method according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the steps as a sequential process, many of the steps can be performed in parallel, concurrently or simultaneously. In addition, the order of the steps may be rearranged. A process may be terminated when its operations are completed, but may have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.
Furthermore, the terms "first," "second," and the like may be used herein to describe various orientations, actions, steps, elements, or the like, but the orientations, actions, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. The terms "first", "second", etc. are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "plurality", "batch" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Example one
The structure of the optical fiber sensing device according to an embodiment of the present invention is described below with reference to fig. 1 to 4. The optical fiber sensing device provided by the embodiment of the invention can be suitable for monitoring the thickness change of various pipeline structures.
As shown in fig. 1, an optical fiber sensing apparatus according to a first embodiment of the present invention includes: the optical fiber sensor comprises an ethylene propylene diene monomer rubber belt 4, an optical fiber sensing module 10 and a connector fixing structure 5, wherein the optical fiber sensing module 10 is embedded in the ethylene propylene diene monomer rubber belt 4, the ethylene propylene diene monomer rubber belt 4 can be tightly attached to a pipeline 7, and the connector fixing structure 5 can fix the ethylene propylene diene monomer rubber belt 4 at a preset position on the pipeline 7.
Generally, the pipe 7 is cylindrical, the ethylene propylene diene monomer rubber belt 4 is tightly attached to the periphery of the pipe 7 along the circumferential direction of the pipe 7, and therefore the optical fiber sensing module 10 embedded in the ethylene propylene diene monomer rubber belt 4 is tightly attached to the periphery of the pipe 7. The epdm rubber belt 4 has two tape tabs 41, and the two tape tabs 41 are fixed to the predetermined position of the pipe 7 by the tab fixing structure 5, even though the optical fiber sensing device is fixed to the predetermined position of the pipe 7. The optical fiber sensing module 10 further comprises two optical fiber connectors 31, wherein the two optical fiber connectors 31 are led out from the ethylene propylene diene monomer rubber belt 4 and can be connected with an external armored cable 9. The optical fiber sensing module 10 tightly attached to the periphery of the pipeline 7 monitors the form change of the pipeline 7, the monitoring data of the pipeline 7 is transmitted to the external armored cable 9 through the optical fiber connector 31, and then is transmitted to a specified position through the external armored cable 9.
In practical application, the optical fiber sensing device provided by the embodiment of the invention can be installed on the surface of the pipeline 7. When the pipeline 7 is corroded, the volume of the ethylene propylene diene monomer rubber belt 4 expands, and the micro deformation of the ethylene propylene diene monomer rubber belt 4 is monitored through the optical fiber sensing module 10 along with the deformation of the ethylene propylene diene monomer rubber belt 4, so that the quantitative monitoring of the metal corrosion degree of the outer surface of the pipeline 7 can be realized. Ethylene-propylene-diene monomer rubber belt 4 can laminate on pipeline 7 surface intact, makes optical fiber sensing device can stably acquire pipeline 7 monitoring data to optical fiber sensing module 10 can monitor small deformation, has the near pipeline metal of reaction that can be accurate and receives the corrosion condition, improves the accuracy of pipeline corrosion monitoring.
Further, as shown in fig. 1-2, the fiber optic sensing module 10 includes a plurality of sensors distributed circumferentially along the conduit 7 and connected by the optical fibers 3. The plurality of sensors may be the same type of sensor or different types of sensors. In this embodiment, the optical Fiber sensing module 10 includes a Fiber Bragg Grating (FBG) strain sensor 11, a FBG temperature sensor 12 and a low coherence interference optical Fiber sensor 13, and a certain distance is provided between every two sensors, and the sensors are connected by an optical Fiber 3 wrapped by an optical Fiber protective sleeve 10. The FBG strain sensor 11 is used for monitoring the strain of the pipeline 7, the FBG temperature sensor 12 is used for monitoring the temperature change of the pipeline 7, and the low coherence interference optical fiber sensor 13 is used for measuring the deformation of the pipeline 7. FBG temperature-sensing ware can compensate FBG strain sensor, revises ambient temperature and to the influence of pipeline 7 corrosion monitoring, makes to pipeline 7 corrosion monitoring more accurate.
Further, as shown in fig. 1, the optical fiber sensing apparatus according to the embodiment of the present invention further includes a splice protection box 6. The connection part of the optical fiber connector 31 and the external armored cable 9 is arranged in the connector protection box 6, so that the influence on data transmission caused by the damage of the optical fiber connector 31 due to the change of the external environment is prevented. Furthermore, the joint fixing structure 5 is arranged in the joint protection box 6 to prevent the ethylene propylene diene monomer belt 4 from being corroded due to the change of the external environment. Thus, the optical fiber sensing device can be fixed at the preset position of the pipe 7 by fixing the joint protection box 6 at the preset position of the pipe 7.
Further, as shown in fig. 3-4, the joint fixing structure 5 is a bolt fixing structure, and includes a bolt assembly and two adhesive tape connecting pieces 53, the bolt assembly includes a bolt 51 and a nut 52, the two adhesive tape connecting pieces 53 are sleeved on the bolt, and an adhesive tape preformed hole 54 is formed in the middle of the adhesive tape connecting piece 53. During installation, the two tape joints 41 of the epdm 4 are inserted into the tape prepared holes 54 of the two tape connectors 53, respectively, and then the nut 52 is tightened, so that the epdm 4 is fixed at a predetermined position in the pipe 7.
Example two
Fig. 5 is a schematic structural diagram of a pipeline corrosion monitoring system according to a second embodiment of the present invention. As shown in fig. 5, a pipeline corrosion monitoring system according to a second embodiment of the present invention includes: a plurality of optical fiber sensing devices 20 and a data processing module 8, in this embodiment, the optical fiber sensing device 20 is an optical fiber sensing device provided in any embodiment of the present invention. The plurality of optical fiber sensing devices 20 are arranged on the surface of the pipeline 7 at intervals of a preset distance, and the external armored cable 9 is connected with the optical fiber connector 31 in the connector protection box 6 of each optical fiber sensing device 20, so that the plurality of optical fiber sensing devices 20 are connected in series. A plurality of optical fiber sensing devices 20 are connected to the data processing module 8 through the external armored cable 9 after being connected in series, the monitoring data of the pipeline 7 acquired by each optical fiber sensing device 20 is transmitted to the data processing module 8 through the external armored cable 9, the monitoring data of the pipeline 7 is calculated and analyzed by the data processing module 8, and the quantitative calculation data of the pipeline corrosion is output.
The pipeline corrosion monitoring system provided by the embodiment of the invention has high measurement precision and convenient and fast operation, can carry out real-time quantitative monitoring on the metal corrosion on the outer surface of the pipeline, and cannot damage the pipeline.
EXAMPLE III
Fig. 6 is a schematic flow chart of a pipeline corrosion monitoring method according to a third embodiment of the present invention, where the pipeline corrosion monitoring method according to the third embodiment of the present invention can be implemented by using a pipeline corrosion monitoring system according to any embodiment of the present invention.
As shown in fig. 6, a third embodiment of the present invention provides a method for monitoring corrosion of a pipeline, including:
s610, acquiring pipeline monitoring data.
Specifically, the pipeline detection data may be acquired by the optical fiber sensing device provided in any embodiment of the present invention. The pipeline monitoring data comprises strain data acquired by the FBG strain sensor, temperature data acquired by the FBG temperature sensor and monitoring data acquired by the low coherence interference optical fiber sensor.
And S620, determining the strain capacity of the sensor according to the pipeline monitoring data.
In this embodiment, the strain amount of the sensor can be obtained through two ways, one is obtained by calculating data collected by the FBG strain sensor and the FBG temperature sensor, and the other is obtained by calculating data collected by the low coherence interference optical fiber sensor, which will be discussed in the following two cases.
For the first calculation, the pipe is in long term contact with air,corrosion reaction occurs, the corrosion makes the pipeline generate expansion deformation, and then the FBG strain sensor (fiber bragg grating sensor) generates light interference. Under the condition, the FBG strain inductor generates tensile deformation, so that the ethylene propylene diene monomer rubber belt is divided into l1The fiber segment, then according to hooke's law of materials mechanics, has:
wherein E is1Is the modulus of elasticity of the grating portion, A1Is a cross-sectional area of the grating portion, /)1Is the length of the grating portion.
Assuming that the surface of the pipeline is uniformly corroded, namely the pipeline is uniformly deformed under the working pressure, the basic formula of the hoop strain and the pipe wall thickness is reflected:
wherein ε is the hoop strain of the pipe, P is the pressure to which the pipe is subjected, R is the outside diameter of the pipe, EgIs the modulus of elasticity of the pipe and h is the thickness of the pipe.
Because the pressure applied to the pipeline in actual engineering is usually stabilized on a constant, the circumferential strain of the pipeline can be considered as being in inverse proportion to the thickness of the pipeline, and therefore the change of the thickness of the pipeline can be reflected directly through the circumferential strain. Therefore, according to hooke's law, the relationship between the strain of the fiber grating and the hoop strain of the pipe can be expressed by the following equation:
wherein E isgIs the modulus of elasticity of the pipe section, AgIs the cross-sectional area of the pipe, epsilonfStrain values obtained for FBG strain sensors.
The wavelength variation and deformation of the FGB strain sensor can be represented by the following formula:
wherein, the delta T is the temperature variation and can be obtained by fitting data obtained by the FBG temperature sensor into a temperature curve; peIs the effective elasto-optic coefficient;
and α are the thermo-optic coefficient and the thermal expansion coefficient of the FGB strain sensor, respectively; λ is the starting wavelength; Δ λ is a wavelength variation amount, and can be calculated from measurement data of the FGB strain sensor.
For the second calculation mode, when the pipeline is corroded and deformed, the low-coherence interference optical fiber sensor generates tensile deformation to generate a deformation quantity delta S (epsilon)1) And the refractive index of the core is changed by delta k (epsilon)1). According to the amount of deformation Delta S (epsilon)1) And refractive index change amount Deltak (. epsilon.)1) The optical path difference Δ a can be obtained, and the calculation formula is as follows:
Δa＝kΔS(ε1)+SΔk(ε1) (3-5)
ε1the strain deformation of the low-coherence interference optical fiber sensor is measured by the low-coherence interference optical fiber sensor; s represents the length of the optical fiber in the low-coherence interference optical fiber sensor, and k represents the index of the fiber core.
The optical path length change of the optical fiber caused by the strain change of the low coherence interference optical fiber sensor can be represented by the following formula:
ΔS(ε1)＝Sε1 (3-6)
the changes in refractive index caused by the strain changes of the low coherence interference fiber optic sensor are respectively represented by the following formulas:
wherein μ is Poisson's ratio, Q1And Q2Is the Pockel constant of the fiber.
The joint type (3-5), the formula (3-6) and the formula (3-7) are used for obtaining the optical path difference calculation mode:
the detailed parameters of the standard single mode fiber are: q1＝0.12，Q2＝0.27，μ＝0.15，k＝1.46。
The quasi-single mode fiber parameters are brought into the formula (3-7), and the relationship between the optical path difference and the strain is obtained as follows:
Δa＝1.19Sε1 (3-9)
and S630, determining the thickness variation of the pipeline according to the strain of the sensor.
Specifically, the relationship between the pipe thickness h and the strain ε can be expressed as:
antithetical couplet formula (3-1) - (3-4) and formula (3-10), can obtain and monitor the pipeline thickness change expression that corresponds jointly by FBG strain inductor and FBG temperature-sensing ware:
the combination of the vertical type (3-5) - (3-9) and the formula (3-10) can obtain the expression of the change of the thickness of the pipeline corresponding to the monitoring by the low-coherence interference optical fiber sensor:
Δ h is the amount of change in the thickness of the pipe, and is usually in mm/a (millimeters/year).
The pipeline corrosion monitoring method provided by the third embodiment of the invention obtains pipeline monitoring data; determining the dependent variable of a sensor according to the pipeline monitoring data; determining the thickness variation of the pipeline according to the strain of the sensor; the real-time quantitative monitoring to the pipeline thickness variation has also been realized, and also the quantitative monitoring to pipeline corrosion degree has been realized, and can measure through multiple mode, and the precision measurement precision is high, and the simple operation just can not cause the damage to the pipeline.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An optical fiber sensing device, comprising:
the ethylene propylene diene monomer rubber belt is tightly attached to the periphery of the pipeline and is provided with two rubber belt joints;
the optical fiber sensing module is embedded in the ethylene propylene diene monomer rubber belt, two optical fiber connectors are led out from the ethylene propylene diene monomer rubber belt, and the optical fiber connectors are used for being connected with an external armored cable to transmit data;
and the joint fixing structure fixes the two adhesive tape joints at the preset positions of the pipeline.
2. The fiber optic sensing device of claim 1, wherein the fiber optic sensing module comprises a plurality of sensors circumferentially distributed along the conduit, the plurality of sensors being connected by optical fibers.
3. The optical fiber sensing device of claim 2, wherein the sensors comprise FBG strain sensors, FBG temperature sensors and low coherence interference optical fiber sensors.
4. The fiber optic sensing device of claim 2, wherein the optical fiber is disposed within a fiber optic protective jacket.
5. The optical fiber sensing device according to claim 1, further comprising a splice protection box fixed at a predetermined position of the pipeline, wherein a connection point of the optical fiber splice and the external armored cable is disposed in the splice protection box.
6. The optical fiber sensing device according to claim 5, wherein the connector fixing structure is a bolt fixing structure, and the bolt fixing structure is provided inside the connector protection box.
7. The optical fiber sensing device according to claim 6, wherein the bolt fixing structure comprises a bolt assembly and two tape connectors, the tape connectors are provided with tape prepared holes, and the tape joints are arranged in the tape prepared holes.
8. A pipeline corrosion monitoring system, which comprises a plurality of optical fiber sensing devices according to any one of claims 1 to 7 and a data processing module, wherein the plurality of optical fiber sensing devices are connected in series through an external armored cable and then are connected with the data processing module.
9. The pipe corrosion monitoring system of claim 8, wherein a plurality of said fiber optic sensing devices are spaced apart a predetermined distance.
10. A pipeline corrosion monitoring method is characterized by comprising the following steps:
acquiring pipeline monitoring data;
determining the dependent variable of a sensor according to the pipeline monitoring data;
and determining the thickness variation of the pipeline according to the strain of the sensor.
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Application publication date: 20210622 |