CN109000157B - Online monitoring device and method for pipeline - Google Patents
Online monitoring device and method for pipeline Download PDFInfo
- Publication number
- CN109000157B CN109000157B CN201811162293.8A CN201811162293A CN109000157B CN 109000157 B CN109000157 B CN 109000157B CN 201811162293 A CN201811162293 A CN 201811162293A CN 109000157 B CN109000157 B CN 109000157B
- Authority
- CN
- China
- Prior art keywords
- pipeline
- optical
- signal
- optical fiber
- stimulated brillouin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012806 monitoring device Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims abstract description 224
- 239000013307 optical fiber Substances 0.000 claims abstract description 137
- 238000012544 monitoring process Methods 0.000 claims abstract description 68
- 238000001228 spectrum Methods 0.000 claims abstract description 17
- 230000008859 change Effects 0.000 claims description 38
- 238000005259 measurement Methods 0.000 claims description 17
- 239000006185 dispersion Substances 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 230000004927 fusion Effects 0.000 claims description 2
- 238000007405 data analysis Methods 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 abstract description 4
- 230000000875 corresponding effect Effects 0.000 description 28
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 6
- 239000003345 natural gas Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000035559 beat frequency Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012351 Integrated analysis Methods 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000006903 response to temperature Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Optical Transform (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses an on-line monitoring device and a monitoring method for a pipeline. The pipeline on-line monitoring device comprises a sensing optical cable, a measuring unit and a monitoring unit; the sensing optical cable comprises a dual-core optical fiber, and the second end of the first optical fiber is connected with the second end of the second optical fiber. The optical power signal is obtained through the measuring unit, the frequency spectrum of the stimulated Brillouin scattering light is determined according to the optical power signal of the stimulated Brillouin scattering light, the frequency shift of the stimulated Brillouin scattering light is determined according to the peak value of the stimulated Brillouin scattering light, the monitoring unit is used for realizing on-line monitoring of service conditions of a pipeline according to historical data analysis and characteristic signal extraction and intelligent recognition, realizing early warning of damage of a third party of the pipeline, pipeline leakage, pipeline settlement deformation, geological disasters and the like in advance, predicting time, place, event trend and the like of an event in advance, accurately positioning, and facilitating timely overhaul and treatment of pipeline maintainers and avoiding major accidents.
Description
Technical Field
The embodiment of the invention relates to the technical field of pipeline leakage monitoring, in particular to an on-line pipeline monitoring device and a monitoring method.
Background
The petroleum and natural gas pipeline transportation is the fifth transportation mode in China, has the advantages of safety, high efficiency, low consumption and the like, and has important significance for guaranteeing energy safety and economic development. The oil and gas pipeline has long distance and is buried underground, the geological environment is complex, and failure accidents can occur due to corrosion, terrain settlement, pipe and construction quality, mechanical construction, artificial damage and the like after long-term service. The oil and gas pipelines are all operated at high pressure, and the conveying medium is inflammable, explosive and toxic, so that once accidents occur, serious economic loss, casualties and environmental pollution are extremely easy to cause, and therefore, the safety on-line monitoring of the oil and gas pipelines is particularly important.
In the prior art, the distributed optical fiber vibration sensing technology represented by Mach-Zehnder interferometer and Sagnac interferometer is applied to oil and gas pipeline engineering, and the communication optical cable laid along the same ditch with the pipeline or the sensing optical cable is used as a sensor, so that the early warning of events such as excavation, mechanical construction, leakage and the like can be realized. However, the Mach-Zehnder interferometer can only realize the positioning of a single vibration event and cannot position a plurality of vibration events along the pipeline due to the limitation of the measurement principle.
Disclosure of Invention
The invention provides an on-line monitoring device and a monitoring method for a pipeline, which are used for realizing on-line monitoring of service conditions of the pipeline and positioning all abnormal positions of the pipeline.
In a first aspect, an embodiment of the present invention provides an online monitoring device for a pipeline, including a sensing optical cable, a measurement unit and a monitoring unit;
the sensing optical cable comprises a double-core optical fiber, namely a first optical fiber and a second optical fiber; the first optical fiber and the second optical fiber each include a first end and a second end; the second end of the first optical fiber is connected with the second end of the second optical fiber;
the measuring unit is connected with the sensing optical cable and is used for outputting a first optical signal to the first end of the first optical fiber, outputting a second optical signal to the first end of the second optical fiber, acquiring an optical power signal along a pipeline transmitted by the sensing optical cable in real time, determining the frequency shift of stimulated Brillouin scattering light according to the optical power signal, and calculating characteristic parameters along the pipeline according to the frequency shift; wherein the first optical signal is a dispersion optical signal and the second optical signal is a continuous sweep optical signal;
the measuring unit is connected with the monitoring unit, and the monitoring unit receives the characteristic parameters along the pipeline output by the measuring unit and judges the state of the pipeline according to a plurality of groups of characteristic parameters along the pipeline.
Specifically, the measurement unit comprises a first light source generator, a second light source generator, a coupler, a photodetector and a processor;
the first light source generator is connected with the coupler, and the coupler is connected with the first end of the first optical fiber; the first light source generator outputs the generated first light signal to the first optical fiber through the coupler;
the second light source generator is connected with the first end of the second optical fiber, and outputs the generated second optical signal to the second optical fiber;
the coupler acquires an optical power signal along the pipeline, which is transmitted by the sensing optical cable in real time;
the photoelectric detector is connected with the coupler, receives the optical power signal along the pipeline output by the coupler and converts the optical power signal into an electric signal;
the processor is connected with the photoelectric detector, receives the electric signal output by the photoelectric detector, determines the frequency spectrum of the stimulated Brillouin scattering light according to the electric signal, determines the frequency shift of the stimulated Brillouin scattering light corresponding to the peak value of the electric signal according to the peak value of the electric signal, and calculates the characteristic parameters along the pipeline according to the frequency shift;
the processor also calculates a position of the peak of the electrical signal corresponding to the conduit based on a time corresponding to the peak in the electrical signal.
Specifically, the relationship between the variation of the frequency shift corresponding to different peaks in the optical power signal and the variation of the temperature and strain is: Δν B ＝υ BS -υ B0 ＝C T ·ΔT+C ε Δε; wherein v BS Frequency shift of the stimulated brillouin scattering light corresponding to a peak in the optical power signal, v B0 For the optical power signalFrequency shift of the stimulated brillouin scattering light corresponding to another peak in the signal, Δν B C is the variation of the frequency shift of the stimulated Brillouin scattering light T Delta T is the temperature change and C is the temperature change ε As the strain change coefficient, Δε is the strain change amount.
Specifically, the processor is further connected to the first light source generator, and the processor is configured to provide a clock signal for the first light source generator, where the first light signal generated by the first light source generator is a pulse light signal.
Specifically, the first light source generator is a pump laser light source, and the second light source generator is a detection laser light source.
Specifically, the second end of the first optical fiber and the second end of the second optical fiber are fusion spliced.
Specifically, the pipeline on-line monitoring device further comprises a fiber receiving box, and a welded joint of the second end of the first optical fiber and the second end of the second optical fiber is arranged in the fiber receiving box.
Specifically, the sensing optical cable is laid along the extending direction of the pipeline, and the sensing optical cable is fixed on the outer wall of the pipeline, or the sensing optical cable and the pipeline are buried in the same ditch.
In a second aspect, an embodiment of the present invention provides an online pipeline monitoring method, where an online pipeline monitoring device includes a sensing optical cable, a measurement unit and a monitoring unit;
the sensing optical cable comprises a double-core optical fiber, namely a first optical fiber and a second optical fiber; the first optical fiber and the second optical fiber each include a first end and a second end; the second end of the first optical fiber is connected with the second end of the second optical fiber;
the measuring unit is connected with the sensing optical cable and is also connected with the monitoring unit;
the pipeline on-line monitoring method comprises the following steps:
the measuring unit outputs a first optical signal to the first end of the first optical fiber and outputs a second optical signal to the first end of the second optical fiber; wherein the first optical signal is a dispersion optical signal and the second optical signal is a continuous sweep optical signal;
the measuring unit acquires optical power signals along the pipeline transmitted by the sensing optical cable in real time, determines the frequency shift of stimulated Brillouin scattering light according to the optical power signals along the pipeline, and calculates characteristic parameters along the pipeline according to the frequency shift;
the monitoring unit receives the characteristic parameters along the pipeline and judges the state of the pipeline according to a plurality of groups of characteristic parameters along the pipeline.
Specifically, the measuring unit acquires optical power signals along the pipeline transmitted by the sensing optical cable in real time, determines the frequency shift of stimulated Brillouin scattering light according to the optical power signals along the pipeline, and calculates characteristic parameters along the pipeline according to the frequency shift; comprising the following steps:
a coupler in the measuring unit acquires an optical power signal along the pipeline, which is transmitted by the sensing optical cable in real time;
the photoelectric detector in the measuring unit converts the optical power signal along the pipeline into an electric signal;
a processor in the measurement unit determines the spectrum of the stimulated brillouin scattered light from the electrical signal;
the processor determines the frequency shift of the stimulated Brillouin scattering light corresponding to the peak value of the electric signal according to the peak value of the electric signal;
the processor calculates characteristic parameters along the pipeline according to the frequency shift;
the processor calculates the position of the peak value of the electrical signal corresponding to the pipeline according to the time corresponding to the peak value in the electrical signal.
According to the technical scheme, the pipeline on-line monitoring device comprises a sensing optical cable, a measuring unit and a monitoring unit; the sensing optical cable comprises a double-core optical fiber, namely a first optical fiber and a second optical fiber; the first optical fiber and the second optical fiber each comprise a first end and a second end; the second end of the first optical fiber is connected with the second end of the second optical fiber; the measuring unit is connected with the sensing optical cable and is used for outputting a first optical signal to the first end of the first optical fiber, outputting a second optical signal to the first end of the second optical fiber, acquiring an optical power signal along the pipeline transmitted by the sensing optical cable in real time, determining the frequency shift of stimulated Brillouin scattering light according to the optical power signal, and calculating the characteristic parameters along the pipeline according to the frequency shift; wherein the first optical signal is a dispersion optical signal, and the second optical signal is a continuous sweep optical signal; the measuring unit is connected with the monitoring unit, and the monitoring unit receives the characteristic parameters along the pipeline output by the measuring unit and judges the state of the pipeline according to the characteristic parameters along the pipeline. The optical power signal is obtained through the measuring unit, the frequency spectrum of the stimulated Brillouin scattering light is determined according to the optical power signal of the stimulated Brillouin scattering light, the frequency shift of the stimulated Brillouin scattering light is determined according to the peak value of the stimulated Brillouin scattering light, the monitoring unit is used for realizing on-line monitoring of service conditions of a pipeline according to historical data analysis and characteristic signal extraction and intelligent recognition, realizing early warning of damage of a third party of the pipeline, pipeline leakage, pipeline settlement deformation, geological disasters and the like in advance, predicting time, place, event trend and the like of an event in advance, accurately positioning, and facilitating timely overhaul and treatment of pipeline maintainers and avoiding major accidents.
Drawings
Fig. 1 is a schematic structural diagram of an on-line monitoring device for a pipeline according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a sensing optical cable according to an embodiment of the present invention;
fig. 3 is a temperature change trend chart of the pipeline transportation of natural gas leakage according to the embodiment of the invention;
FIG. 4 is a graph showing the trend of temperature change when oil is leaked in pipeline transportation according to the embodiment of the invention;
FIG. 5 is a schematic structural diagram of another on-line monitoring device for pipeline according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a sensor cable laying structure according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of another embodiment of a sensor cable laying;
FIG. 8 is a flowchart of an on-line monitoring method for a pipeline according to an embodiment of the present invention;
fig. 9 is a flowchart of another pipeline online monitoring method according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a schematic structural diagram of an on-line monitoring device for a pipeline according to an embodiment of the present invention, as shown in fig. 1, the on-line monitoring device for a pipeline includes a sensing optical cable 10, a measuring unit 20 and a monitoring unit 30. The sensing optical cable 10 includes a dual-core optical fiber, a first optical fiber 11 and a second optical fiber 12, respectively; the first optical fiber 11 and the second optical fiber 12 each include a first end and a second end; the second end b1 of the first optical fiber 11 is connected to the second end b2 of the second optical fiber 12; the measuring unit 20 is connected with the sensing optical cable 10, and the measuring unit 20 is used for outputting a first optical signal to a first end a1 of the first optical fiber 11, outputting a second optical signal to a first end a2 of the second optical fiber 12, acquiring an optical power signal along the pipeline 40 transmitted by the sensing optical cable 10 in real time, determining the frequency shift of the stimulated Brillouin scattering light according to the optical power signal, and calculating characteristic parameters along the pipeline 40 according to the frequency shift; wherein the first optical signal is a dispersion optical signal, and the second optical signal is a continuous sweep optical signal; the measuring unit 20 is connected with the monitoring unit 30, and the monitoring unit 30 receives the characteristic parameters along the lines of the pipelines 40 output by the measuring unit 20 and judges the states of the pipelines according to the characteristic parameters along the lines of the multiple groups of pipelines 40.
Specifically, fig. 2 is a schematic structural diagram of a sensing optical cable according to an embodiment of the present invention, as shown in fig. 2, the sensing optical cable 10 includes a dual-core optical fiber, which is a first optical fiber 11 and a second optical fiber 12, respectively, the first optical fiber 11 and the second optical fiber 12 are non-coaxial multi-core optical fibers of the optical cable, and the first optical fiber 11 and the second optical fiber 12 are both single-mode sensing optical fibers 41. The single-mode sensing optical fiber 41 adopts a high-strength double-layer steel wire armor design, namely a seamless steel tube 42 and a stainless steel woven net 44, an aramid fiber material 43, namely a Kevlar material is arranged between the double-layer steel wires, a firm sheath 45 is further arranged on the outer layer of the double-layer steel wires, and the sheath 45 is shared by the first optical fiber 11 and the second optical fiber 12. The double-layer steel wire armor design and the sheath 45 enable the sensing optical cable 10 to have good mechanical properties such as tensile strength, compression strength and the like, and meanwhile, the flexibility is very good, the construction and the arrangement are easy, the heat penetration is fast, and the response to temperature and pressure is fast. To achieve single-ended measurement, the second end b1 of the first optical fiber 11 is connected to the second end b2 of the second optical fiber 12, thereby forming a loop required for stimulated brillouin scattering measurement.
The measurement unit 20 outputs a first optical signal to the first optical fiber 11 and a second optical signal to the second optical fiber 12. The first optical signal is a dispersion optical signal, the second optical signal is a continuous sweep optical signal, and the sweep frequency of the sweep optical signal is in a continuously changing state. The first optical signal may be a pump laser, and the second optical signal may be a probe laser, the frequency of which is continuously changed, for example. The pump laser is injected into the first optical fiber 11 and the probe laser is injected into the second optical fiber 12. The second end b1 of the first optical fiber 11 is connected to the second end b2 of the second optical fiber 12 to form a loop of the stimulated brillouin scattered light, and thus the stimulated brillouin scattered light can be formed in the sensor cable 10. When the frequency difference between the pump laser and the probe laser is equal to the frequency shift of the stimulated brillouin scattered light in a certain section of the sensing optical cable 10, the pump laser and the probe laser interact strongly with each other in the sensing optical cable 10 and generate phonons at the equal position, the stimulated brillouin scattered light amplifying effect occurs in the section, and energy transfer occurs between the pump laser and the probe laser, at this time, the light power of the stimulated brillouin scattered light reaches a peak value, so that the spectrum of the stimulated brillouin scattered light can be determined according to the light power signal of the stimulated brillouin scattered light, and the frequency shift of the stimulated brillouin scattered light can be determined according to the peak value of the stimulated brillouin scattered light. The propagation direction of the stimulated brillouin scattered light is opposite to the direction of the first optical signal and the direction of the second optical signal, so that the measurement unit 20 acquires the optical power signal of the stimulated brillouin scattered light at the first end a1 of the first optical fiber 11 in real time, performs beat processing on the optical power signal, that is, performs frequency domain analysis on the optical power signal by beat frequency to obtain the spectrum of the stimulated brillouin scattered light, and acquires the frequency shift of the stimulated brillouin scattered light, that is, the frequency corresponding to the peak value in the stimulated brillouin scattered light spectrum by the spectrum.
It should be noted that, because the propagation speed of the optical power signal is too fast, the conventional fourier transform cannot perform the spectral transformation on the optical power signal, so the optical power signal is subjected to the frequency domain analysis by using the beat frequency.
The frequency shift of the stimulated brillouin scattering light is related to the characteristic parameters along the sensing optical cable 10, for example, the frequency shift of the stimulated brillouin scattering light is related to the temperature and the pressure, the characteristic parameters along the pipeline 40 including the temperature and the strain are calculated according to the frequency shift of the stimulated brillouin scattering light, the characteristic parameters along the pipeline 40 are output to the monitoring unit 30, the monitoring unit 30 stores historical data, the historical data can be one or more groups of characteristic parameters along the pipeline 40, and the monitoring unit 30 analyzes whether the characteristic parameters along the pipeline 40 change according to the historical data and the characteristic parameters along the pipeline 40 output by the measuring unit 20. Thus, the measurement unit 20 enables single-ended measurement of the pipe 40 through the first end a1 of the first optical fiber 11. When the characteristic parameters along the pipeline 40 change, the monitoring unit 30 determines the state of the pipeline 40 according to the change amount of the characteristic parameters along the pipeline 40, thereby realizing on-line monitoring of the service condition of the pipeline 40, realizing pre-warning on third party damage of the pipeline 40, leakage of the pipeline 40, sedimentation deformation of the pipeline 40, geological disasters and the like, pre-predicting the time, place, event trend and the like of occurrence in advance, and facilitating timely overhaul and treatment of pipeline maintainers and avoiding major accidents.
In addition, the propagation speed of the optical power signal is fixed, that is, the propagation speed of light in the same medium is a certain value, when the measurement unit 20 obtains the optical power of the stimulated brillouin scattering light, the peak value of the optical power signal corresponds to an obtaining time, the position of the peak value of the optical power signal corresponding to the pipeline 40 can be calculated according to the obtaining time and the propagation speed of the light in the medium, and the monitoring unit 30 analyzes the temperature and the stress variation quantity at the corresponding position of the pipeline 40 according to the historical data, so that the position of the pipeline 40 along the line where the temperature and the stress change occur can be accurately positioned, the pipeline maintainer can conveniently overhaul and process in time, and serious accidents are avoided.
In general, the temperature field along the line is uniformly distributed when the pipe 40 is in normal operation, and the variation of the temperature and strain around the pipe 40 is zero. When the wall of the pipe 40 leaks due to breakage, joint breakage, or the like, the temperature at the leak will change. Illustratively, the conduit 40 may transport natural gas or oil. Fig. 3 is a temperature change trend chart during natural gas leakage in pipeline transportation, and as shown in fig. 3, the horizontal axis represents the position of the pipeline 40, and the vertical axis represents temperature values corresponding to different positions of the pipeline 40. When the pipeline 40 is transporting natural gas, the natural gas is throttled and expanded by the Joule-Thomson effect through the leak orifice, the enthalpy before and after the throttle expansion process is unchanged, and the temperature at the outlet of the leak orifice is reduced, as the lowest point of the temperature values in FIG. 3. Fig. 4 is a temperature change trend chart of the pipeline in oil transportation and leakage according to an embodiment of the present invention, where, as shown in fig. 4, the horizontal axis is the position of the pipeline 40, and the vertical axis is the temperature values corresponding to different positions of the pipeline 40. When the pipe 40 carries oil, the temperature at the leak will rise as the oil is transported by heating, as shown by the highest point of the temperature values in fig. 4. Therefore, the temperature change along the pipeline 40 can be timely captured through the sensing optical cable 10 and displayed on the temperature distribution curve in real time, so that the position of the pipeline 40 where the temperature change occurs can be determined.
It should be noted that, when the temperature value of the pipe 40 at different positions along the line includes a plurality of peaks, it is noted that there may be a plurality of leaks along the line of the pipe 40, and at this time, the position of the leak of the pipe 40 is also calculated according to the time corresponding to the peak in the optical power signal. Moreover, the on-line monitoring device monitors the pipe 40 for a long time, and thus the formed optical power signal is a cyclic signal whose cyclic period is the time required for the entire length of the pipe 40 to be detected once. When the optical power signal includes a plurality of peaks, the number of peaks included in the same cycle is the number of leaks along the line of the pipe 40.
According to the technical scheme of the embodiment, the pipeline on-line monitoring device comprises a sensing optical cable, a measuring unit and a monitoring unit; the sensing optical cable comprises a double-core optical fiber, namely a first optical fiber and a second optical fiber; the first optical fiber and the second optical fiber each comprise a first end and a second end; the second end of the first optical fiber is connected with the second end of the second optical fiber; the measuring unit is connected with the sensing optical cable and is used for outputting a first optical signal to the first end of the first optical fiber, outputting a second optical signal to the first end of the second optical fiber, acquiring an optical power signal along the pipeline transmitted by the sensing optical cable in real time, realizing single-ended measurement of the pipeline, determining the frequency shift of stimulated Brillouin scattering light according to the optical power signal, and calculating characteristic parameters along the pipeline according to the frequency shift; wherein the first optical signal is a dispersion optical signal, and the second optical signal is a continuous sweep optical signal; the measuring unit is connected with the monitoring unit, and the monitoring unit receives the characteristic parameters along the pipeline output by the measuring unit and judges the state of the pipeline according to the characteristic parameters along the pipeline. The optical power signal is obtained through the measuring unit, the frequency spectrum of the stimulated Brillouin scattering light is determined according to the optical power signal of the stimulated Brillouin scattering light, the frequency shift of the stimulated Brillouin scattering light is determined according to the peak value of the stimulated Brillouin scattering light, the monitoring unit is used for realizing on-line monitoring of service conditions of a pipeline according to historical data analysis and characteristic signal extraction and intelligent recognition, realizing early warning of damage of a third party of the pipeline, pipeline leakage, pipeline settlement deformation, geological disasters and the like in advance, predicting time, place, event trend and the like of an event in advance, accurately positioning, and facilitating timely overhaul and treatment of pipeline maintainers and avoiding major accidents.
Based on the above technical solutions, the relationship between the amount of change in frequency shift corresponding to different peaks in the optical power signal and the amount of change in temperature and strain is: Δν B ＝υ BS -υ B0 ＝C T ·ΔT+C ε Δε (formula 1); wherein v is BS Frequency shift of stimulated brillouin scattered light corresponding to a peak in an optical power signal, v B0 For the frequency shift of the stimulated brillouin scattered light corresponding to another peak in the optical power signal, Δν B Is stimulated Brillouin scattering lightThe amount of change in the frequency shift of C T Delta T is the temperature change and C is the temperature change ε As the strain change coefficient, Δε is the strain change amount.
Specifically, the frequency shift of the stimulated brillouin scattered light is correlated with the temperature and pressure sensed by the sensing optical cable, i.e., the relationship between the amount of change in the frequency shift of the stimulated brillouin scattered light and the amount of change in temperature and strain is positive, as shown in equation 1. After the pipeline transportation raw material is determined, the temperature change coefficient C T Coefficient of strain change C ε The frequency shift change amount of the stimulated Brillouin scattering light is only related to the temperature change amount and the strain change amount, characteristic parameter data such as the temperature and the strain of the pipeline along the line can be obtained by fitting the frequency spectrum of the stimulated Brillouin scattering light according to the formula 1, the monitoring unit compares the characteristic parameter data such as the temperature and the strain of the pipeline along the line with the historical data, and if the characteristic parameter data such as the temperature and the strain of the pipeline along the line are unchanged or are changed within a certain range compared with the historical data, the pipeline is free from leakage and the like, and the service condition of the pipeline is good. If the characteristic parameter data such as the temperature and the strain along the pipeline are greatly changed compared with the historical data, leakage and the like can possibly occur, and the time of receiving the optical power signal and the propagation speed of light in the sensing optical fiber calculate the position where the temperature and the strain change, so that the time, the place, the event trend and the like of the event can be predicted in advance, and the pipeline maintainer can conveniently overhaul and process in time, thereby avoiding major accidents.
With continued reference to fig. 1, the second end b1 of the first optical fiber 11 and the second end b2 of the second optical fiber 12 are fused together, so that the second end b1 of the first optical fiber 11 and the second end b2 of the second optical fiber 12 can be in good contact.
In addition, the optical fiber collecting box 50 is further included, a welded connection between the second end b1 of the first optical fiber 11 and the second end b2 of the second optical fiber 12 is arranged in the optical fiber collecting box 50, and the optical fiber collecting box 50 protects the welded connection between the second end b1 of the first optical fiber 11 and the second end b2 of the second optical fiber 12 from corroding or breaking the connection in the external environment.
On the basis of the above technical solutions, fig. 5 is a schematic structural diagram of another on-line monitoring device for a pipeline according to an embodiment of the present invention, and as shown in fig. 5, the measurement unit 20 includes a first light source generator 21, a second light source generator 22, a coupler 23, a photodetector 24 and a processor 25.
The first light source generator 21 is connected with a coupler 23, and the coupler 23 is connected with a first end of a first optical fiber; the second light source generator 22 is connected to the first end of the second optical fiber, the photodetector 24 is connected to the coupler 23, and the processor 25 is connected to the photodetector 24.
The first light source generator 21 outputs the generated first optical signal to the first optical fiber through the coupler 23. The second light source generator 22 outputs the generated second light signal to the second optical fiber. The coupler 23 acquires the optical power signal along the conduit 40 that is transmitted in real time by the sensing fiber optic cable 10. The photodetector 24 receives the optical power signal along the line 40 output by the coupler 23 and converts it into an electrical signal. The processor 25 receives the electrical signal output by the photodetector 24, determines the spectrum of the stimulated brillouin scattered light from the electrical signal, determines the frequency shift of the stimulated brillouin scattered light corresponding to the peak of the electrical signal from the peak of the electrical signal, and calculates the characteristic parameters along the pipeline from the frequency shift. Processor 25 also calculates the position of the tube 40 corresponding to the peak of the electrical signal from the time corresponding to the peak in the electrical signal.
Specifically, the first light signal generated by the first light source generator 21, and the second light signal generated by the second light source generator 22. Since the first optical signal may be a pump laser, the first light source generator 21 may be a pump laser light source. And the second optical signal may be a detection laser, so the second light source generator 22 may be a detection laser light source. The first optical signal propagates through the first optical fiber 11, the second optical signal propagates through the second optical fiber 12, and after stimulated brillouin scattering light is generated in the sensing optical cable 10, the coupler 23 obtains an optical power signal along the pipeline 40, which is transmitted by the sensing optical cable 10 in real time, so that single-ended measurement of the pipeline 40 is realized. The optical power signal may comprise a plurality of lasers, such as a second optical signal, stimulated brillouin scattered light, etc. And transmits the optical power signal to the photodetector 24, the photodetector 24 converts the optical power signal into an electrical signal and transmits the electrical signal to the processor 25, the processor 25 performs beat frequency analysis on the electrical signal to form a spectrum of stimulated brillouin scattered light, determines a frequency shift of the stimulated brillouin scattered light corresponding to a peak value of the electrical signal according to a peak value of the electrical signal, calculates a position of the pipeline 40 corresponding to the peak value of the electrical signal according to a time corresponding to the peak value, and calculates a characteristic parameter along the pipeline 40 according to the frequency shift. The monitoring unit 30 then analyzes the historical data for changes in the characteristic parameters along the pipeline 40. When the characteristic parameters along the pipeline 40 change, the monitoring unit 30 determines the state of the pipeline 40 according to the change amount of the characteristic parameters along the pipeline 40, so as to realize online monitoring of the service condition of the pipeline 40. In general, the monitoring unit 30 is connected to the measuring unit 20 through a transmission network, and the monitoring unit 30 includes an industrial personal computer 31 and an integrated analysis monitoring unit 32. When the monitoring unit 30 receives the characteristic parameters along the pipeline 40 transmitted by the measuring unit 20, the industrial personal computer 31 controls the comprehensive analysis monitoring unit 32 to perform data analysis, characteristic signal extraction and intelligent recognition. When the characteristic parameters along the pipeline 40 have a larger phase difference with the historical data in the industrial personal computer 31, the comprehensive analysis and monitoring unit 32 sends out an early warning positioning signal, so that the early warning of the damage of a third party to the pipeline 40, the leakage of the pipeline 40, the sedimentation deformation of the pipeline 40, geological disasters and the like is realized, the time, the place, the event trend and the like of the occurrence are predicted in advance, the accurate positioning is realized, and the timely overhaul and treatment of pipeline maintainers are facilitated, and the occurrence of major accidents is avoided. In addition, the processor 25 is further connected to the first light source generator 21, and the processor 25 is configured to provide a clock signal to the first light source generator 21, where the first light signal generated by the first light source generator 21 is a pulse light signal.
Fig. 6 is a schematic structural diagram of a sensor cable laying according to an embodiment of the present invention, where, as shown in fig. 6, the sensor cable 10 is laid along a direction in which the duct 40 extends, and the sensor cable 10 is fixed on an outer wall of the duct 40.
Specifically, as shown in fig. 6, the pipe 40 is buried in the soil 60, and the sensing optical cable 10 is fixed to the outer wall of the pipe 40 at a very close distance from the pipe 40, so that it is possible to accurately respond to the variation of the characteristic parameters along the pipe 40 in real time.
Fig. 7 is a schematic diagram of another structure of laying a sensing optical cable according to an embodiment of the present invention, where, as shown in fig. 7, the sensing optical cable 10 is laid along a direction in which the pipe 40 extends, and the sensing optical cable 10 is buried in the same trench as the pipe 40.
Specifically, the pipe 40 is buried in the soil 60, the sensing optical cable 10 and the pipe 40 are buried in the same ditch, and the periphery of the sensing optical cable 10 further comprises a compacting soil layer 61, wherein the compacting soil layer 61 can better support the sensing optical cable 10. In general, when the sensing optical cable 10 and the pipeline 40 are buried in the same ditch, the vertical distance between the sensing optical cable 10 and the pipeline 40 is within 1m, so as to avoid the problem that the sensing optical cable 10 cannot accurately respond to the change of the characteristic parameters along the pipeline 40 in real time due to the overlarge distance between the sensing optical cable 10 and the pipeline 40 when the sensing optical cable 10 and the pipeline 40 are buried in the same ditch.
The embodiment of the invention also provides a method for on-line monitoring of the pipeline, which can be used for detecting whether the pipeline has the abnormality such as leakage and the like.
The pipeline on-line monitoring device comprises a sensing optical cable, a measuring unit and a monitoring unit. The sensing optical cable comprises a double-core optical fiber, namely a first optical fiber and a second optical fiber; the first optical fiber and the second optical fiber each comprise a first end and a second end; the second end of the first optical fiber is connected with the second end of the second optical fiber; the measuring unit is connected with the sensing optical cable, and the measuring unit is also connected with the monitoring unit.
Fig. 8 is a flowchart of an online pipeline monitoring method according to an embodiment of the present invention, as shown in fig. 8, where the online pipeline monitoring method includes:
s810, the measuring unit outputs a first optical signal to a first end of a first optical fiber and outputs a second optical signal to a first end of a second optical fiber; the first optical signal is a dispersion optical signal, and the second optical signal is a continuous sweep optical signal.
Specifically, the first optical signal may be a pump laser, which is a pulse optical signal. The second optical signal may be a detection laser, the frequency of which is continuously varied. The second end of the first optical fiber is connected with the second end of the second optical fiber to form a loop of stimulated brillouin scattering light, so that the stimulated brillouin scattering light can be formed in the sensing optical cable. When the frequency difference between the pump laser and the detection laser is equal to the frequency shift of the stimulated brillouin scattering light in a certain section of the sensing optical cable, the optical power of the stimulated brillouin scattering light reaches a peak value.
S820, the measuring unit acquires optical power signals along the pipeline transmitted by the sensing optical cable in real time, determines the frequency shift of stimulated Brillouin scattering light according to the optical power signals along the pipeline, and calculates characteristic parameters along the pipeline according to the frequency shift.
Specifically, the propagation direction of the stimulated brillouin scattering light is the same as that of the second optical signal, so that the measuring unit can acquire the optical power signal along the pipeline transmitted by the sensing optical cable through the first end of the first optical fiber in real time. The optical power signal is subjected to beat frequency analysis to form a spectrum of stimulated brillouin scattered light. When the optical power of the stimulated brillouin scattering light reaches a peak value, the frequency shift of the stimulated brillouin scattering light can be determined from the spectrum corresponding to the peak value. Whereas the frequency shift of the stimulated brillouin scattered light is related to a characteristic parameter along the sensing cable 10, for example, to temperature and pressure, the characteristic parameter along the pipeline can be calculated from the frequency shift of the stimulated brillouin scattered light.
And S830, the monitoring unit receives the characteristic parameters along the pipeline and judges the state of the pipeline according to the characteristic parameters along the pipeline of a plurality of groups.
Specifically, the monitoring unit stores historical data, the historical data can be one or more groups of characteristic parameters along the pipeline, and the monitoring unit analyzes whether the characteristic parameters along the pipeline change according to the historical data and the characteristic parameters along the pipeline output by the measuring unit. Therefore, the service condition of the pipeline is monitored on line, the early warning is carried out on the damage of a third party of the pipeline, the leakage of the pipeline, the sedimentation deformation of the pipeline, the geological disaster and the like, the time, the place, the event trend and the like of the event are predicted in advance, and the pipeline maintainer can conveniently overhaul and process the pipeline in time, so that the occurrence of major accidents is avoided.
According to the technical scheme, the pipeline on-line monitoring method comprises the steps that a measuring unit outputs a first optical signal to a first end of a first optical fiber and outputs a second optical signal to a first end of a second optical fiber; the first optical signal is a dispersion optical signal, and the second optical signal is a continuous sweep optical signal. The measuring unit acquires optical power signals along the pipeline transmitted by the sensing optical cable in real time, realizes single-end measurement of the pipeline, determines the frequency shift of stimulated Brillouin scattering light according to the optical power signals along the pipeline, and calculates characteristic parameters along the pipeline according to the frequency shift. The monitoring unit receives the characteristic parameters along the pipeline and judges the state of the pipeline according to the characteristic parameters along the pipeline. Therefore, the service condition of the pipeline is monitored online, the early warning of the damage of a third party of the pipeline, the leakage of the pipeline, the sedimentation deformation of the pipeline, the geological disasters and the like is realized, the time, the place, the event trend and the like of the event are predicted in advance, the accurate positioning is realized, and the timely overhaul and treatment of pipeline maintainers are facilitated, so that the occurrence of major accidents is avoided.
Fig. 9 is a flowchart of another on-line monitoring method for a pipeline according to an embodiment of the present invention, as shown in fig. 9, based on the above embodiment, step S820 may be replaced by:
s821, a coupler in the measuring unit acquires an optical power signal along a pipeline transmitted by the sensing optical cable in real time.
S822, the photoelectric detector in the measuring unit converts the optical power signal along the pipeline into an electric signal.
S823, a processor in the measuring unit determines the frequency spectrum of the stimulated Brillouin scattering light according to the electric signals.
S824, the processor determines the frequency shift of the stimulated Brillouin scattering light corresponding to the peak value of the electric signal according to the peak value of the electric signal.
S825, the processor calculates characteristic parameters along the pipeline according to the frequency shift.
And S826, the processor calculates the position of the pipeline corresponding to the peak value of the electric signal according to the time corresponding to the peak value in the electric signal.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. The on-line pipeline monitoring device is characterized by comprising a sensing optical cable, a measuring unit and a monitoring unit;
the sensing optical cable comprises a double-core optical fiber, namely a first optical fiber and a second optical fiber; the first optical fiber and the second optical fiber each include a first end and a second end; the second end of the first optical fiber is connected with the second end of the second optical fiber;
the measuring unit is connected with the sensing optical cable and is used for outputting a first optical signal to the first end of the first optical fiber, outputting a second optical signal to the first end of the second optical fiber, acquiring an optical power signal along a pipeline transmitted by the sensing optical cable in real time, determining the frequency shift of stimulated Brillouin scattering light according to the optical power signal, and calculating characteristic parameters along the pipeline according to the frequency shift; wherein the first optical signal is a dispersion optical signal and the second optical signal is a continuous sweep optical signal;
the measuring unit is connected with the monitoring unit, and the monitoring unit receives the characteristic parameters along the pipeline output by the measuring unit and judges the state of the pipeline according to a plurality of groups of characteristic parameters along the pipeline;
the measuring unit comprises a first light source generator, a second light source generator, a coupler, a photoelectric detector and a processor;
the first light source generator is connected with the coupler, and the coupler is connected with the first end of the first optical fiber; the first light source generator outputs the generated first light signal to the first optical fiber through the coupler;
the second light source generator is connected with the first end of the second optical fiber, and outputs the generated second optical signal to the second optical fiber;
the coupler acquires an optical power signal along the pipeline, which is transmitted by the sensing optical cable in real time;
the photoelectric detector is connected with the coupler, receives the optical power signal along the pipeline output by the coupler and converts the optical power signal into an electric signal;
the processor is connected with the photoelectric detector, receives the electric signal output by the photoelectric detector, determines the frequency spectrum of the stimulated Brillouin scattering light according to the electric signal, determines the frequency shift of the stimulated Brillouin scattering light corresponding to the peak value of the electric signal according to the peak value of the electric signal, and calculates the characteristic parameters along the pipeline according to the frequency shift;
the processor also calculates the position of the peak value of the electrical signal corresponding to the pipeline according to the time corresponding to the peak value in the electrical signal;
the relation between the variation of the frequency shift corresponding to different peaks in the optical power signal and the variation of the temperature and the strain is as follows: Δν B ＝υ BS -υ B0 ＝C T ·ΔT+C ε Δε; wherein v is BS A frequency shift v of the stimulated Brillouin scattered light corresponding to a peak in the optical power signal B0 A frequency shift of the stimulated brillouin scattered light corresponding to another peak in the optical power signal, Δv B C is the variation of the frequency shift of the stimulated Brillouin scattering light T Delta T is the temperature change and C is the temperature change ε As the strain change coefficient, delta epsilon is the strain change amount;
wherein the second end of the first optical fiber and the second end of the second optical fiber are fusion spliced.
2. The on-line monitoring device of claim 1, wherein the processor is further coupled to the first light source generator, the processor configured to provide a clock signal to the first light source generator, the first light signal generated by the first light source generator being a pulsed light signal.
3. The on-line monitoring device of claim 1, wherein the first light source generator is a pump laser light source and the second light source generator is a detection laser light source.
4. The on-line monitoring device of claim 1, further comprising a fiber collection box, wherein a welded junction of the second end of the first optical fiber and the second end of the second optical fiber is disposed within the fiber collection box.
5. The on-line monitoring device of claim 1, wherein the sensing fiber optic cable is laid along a direction in which the pipe extends, the sensing fiber optic cable is fixed on an outer wall of the pipe, or the sensing fiber optic cable is buried in a same trench as the pipe.
6. The pipeline online monitoring method is characterized in that the pipeline online monitoring device comprises a sensing optical cable, a measuring unit and a monitoring unit;
the sensing optical cable comprises a double-core optical fiber, namely a first optical fiber and a second optical fiber; the first optical fiber and the second optical fiber each include a first end and a second end; the second end of the first optical fiber is connected with the second end of the second optical fiber;
the measuring unit is connected with the sensing optical cable and is also connected with the monitoring unit;
the pipeline on-line monitoring method comprises the following steps:
the measuring unit outputs a first optical signal to the first end of the first optical fiber and outputs a second optical signal to the first end of the second optical fiber; wherein the first optical signal is a dispersion optical signal and the second optical signal is a continuous sweep optical signal;
the measuring unit acquires optical power signals along the pipeline transmitted by the sensing optical cable in real time, determines the frequency shift of stimulated Brillouin scattering light according to the optical power signals along the pipeline, and calculates characteristic parameters along the pipeline according to the frequency shift;
the monitoring unit receives the characteristic parameters along the pipeline and judges the state of the pipeline according to a plurality of groups of characteristic parameters along the pipeline.
7. The on-line monitoring method of a pipeline according to claim 6, wherein the measuring unit acquires optical power signals along the pipeline transmitted by the sensing optical cable in real time, determines frequency shift of stimulated brillouin scattering light according to the optical power signals along the pipeline, and calculates characteristic parameters along the pipeline according to the frequency shift; comprising the following steps:
a coupler in the measuring unit acquires an optical power signal along the pipeline, which is transmitted by the sensing optical cable in real time;
the photoelectric detector in the measuring unit converts the optical power signal along the pipeline into an electric signal;
a processor in the measurement unit determines the spectrum of the stimulated brillouin scattered light from the electrical signal;
the processor determines the frequency shift of the stimulated Brillouin scattering light corresponding to the peak value of the electric signal according to the peak value of the electric signal;
the processor calculates characteristic parameters along the pipeline according to the frequency shift;
the processor calculates the position of the peak value of the electrical signal corresponding to the pipeline according to the time corresponding to the peak value in the electrical signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811162293.8A CN109000157B (en) | 2018-10-01 | 2018-10-01 | Online monitoring device and method for pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811162293.8A CN109000157B (en) | 2018-10-01 | 2018-10-01 | Online monitoring device and method for pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109000157A CN109000157A (en) | 2018-12-14 |
| CN109000157B true CN109000157B (en) | 2024-03-29 |
Family
ID=64589896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811162293.8A Active CN109000157B (en) | 2018-10-01 | 2018-10-01 | Online monitoring device and method for pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109000157B (en) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2017246521B2 (en) | 2016-04-07 | 2023-02-02 | Bp Exploration Operating Company Limited | Detecting downhole sand ingress locations |
| BR112018070577A2 (en) | 2016-04-07 | 2019-02-12 | Bp Exploration Operating Company Limited | detection of downhole sand ingress locations |
| EP3608503B1 (en) | 2017-03-31 | 2022-05-04 | BP Exploration Operating Company Limited | Well and overburden monitoring using distributed acoustic sensors |
| EA202090528A1 (en) | 2017-08-23 | 2020-07-10 | Бп Эксплорейшн Оперейтинг Компани Лимитед | DETECTION OF WELL SANDS |
| WO2019072899A2 (en) | 2017-10-11 | 2019-04-18 | Bp Exploration Operating Company Limited | Detecting events using acoustic frequency domain features |
| CA3120493A1 (en) | 2018-11-29 | 2020-06-04 | Bp Exploration Operating Company Limited | Das data processing to identify fluid inflow locations and fluid type |
| GB201820331D0 (en) | 2018-12-13 | 2019-01-30 | Bp Exploration Operating Co Ltd | Distributed acoustic sensing autocalibration |
| CN111458059B (en) * | 2019-01-21 | 2022-01-28 | 中国科学院上海光学精密机械研究所 | Continuous vehicle collision detection system and method thereof |
| CN110345383A (en) * | 2019-06-05 | 2019-10-18 | 精楷电子科技（上海）有限公司 | A kind of on-Line Monitor Device and jet chimney |
| CN110515340B (en) * | 2019-07-09 | 2020-12-08 | 深圳市中燃科技有限公司 | Inspection remote control system and method for cooperative protection with fire-fighting system |
| CN110333059B (en) * | 2019-07-26 | 2021-06-11 | 中南大学 | Shield/TBM hob rotation state and string mill online detection method based on abrasion detection |
| WO2021073740A1 (en) | 2019-10-17 | 2021-04-22 | Lytt Limited | Inflow detection using dts features |
| EP4045766A1 (en) | 2019-10-17 | 2022-08-24 | Lytt Limited | Fluid inflow characterization using hybrid das/dts measurements |
| CN110702212B (en) * | 2019-10-30 | 2021-11-09 | 中石化石油工程技术服务有限公司 | Oil-gas pipeline optical fiber calibration method combining fixed seismic source device and phi-OTDR sensing system |
| CN110796310A (en) * | 2019-10-30 | 2020-02-14 | 黄淮学院 | Method and system for predicting susceptibility to regional geological disasters |
| CN110926355B (en) * | 2019-11-07 | 2020-10-02 | 华中科技大学 | Brillouin frequency shift extraction method and device based on convolutional neural network |
| WO2021093974A1 (en) | 2019-11-15 | 2021-05-20 | Lytt Limited | Systems and methods for draw down improvements across wellbores |
| CN111141416A (en) * | 2020-01-09 | 2020-05-12 | 中国电建集团华东勘测设计研究院有限公司 | Method for detecting position of pipeline external water entering buried pipeline or dark culvert by Brillouin optical time domain analysis technology |
| EP4165284A1 (en) | 2020-06-11 | 2023-04-19 | Lytt Limited | Systems and methods for subterranean fluid flow characterization |
| EP4168647A1 (en) | 2020-06-18 | 2023-04-26 | Lytt Limited | Event model training using in situ data |
| CN112556823A (en) * | 2020-12-08 | 2021-03-26 | 武汉理工光科股份有限公司 | Oil-gas pipeline cleaner ball-clamping positioning monitoring method and device based on distributed optical fiber sensing |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030027471A (en) * | 2001-09-28 | 2003-04-07 | 주식회사 세기엔지니어링 | Fiber Optic Brillouin OTDA(Optical Time Domain Analysis) Sensor System and the Strain Measurement Method of Large Structures |
| CA2615327A1 (en) * | 2006-12-26 | 2008-06-26 | Yokogawa Electric Corporation | Optical fiber characteristic measuring system |
| CN103162866A (en) * | 2011-12-15 | 2013-06-19 | 西安金和光学科技有限公司 | Distributed type sensing device based on double-core double-wrapping layer optical fiber |
| CN103698049A (en) * | 2013-12-18 | 2014-04-02 | 中国能源建设集团广东省电力设计研究院 | Brillouin-scattering-based distributed measurement system and method |
| CN103712639A (en) * | 2013-12-06 | 2014-04-09 | 何祖源 | Distributed rapid detection method and device of optical fiber Brillouin scattering spectrum |
| CN208832125U (en) * | 2018-10-01 | 2019-05-07 | 江苏亨通光纤科技有限公司 | A kind of pipeline on-Line Monitor Device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9574911B2 (en) * | 2012-08-09 | 2017-02-21 | Corning Incorporated | Two-core optical fibers for distributed fiber sensors and systems |
-
2018
- 2018-10-01 CN CN201811162293.8A patent/CN109000157B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030027471A (en) * | 2001-09-28 | 2003-04-07 | 주식회사 세기엔지니어링 | Fiber Optic Brillouin OTDA(Optical Time Domain Analysis) Sensor System and the Strain Measurement Method of Large Structures |
| CA2615327A1 (en) * | 2006-12-26 | 2008-06-26 | Yokogawa Electric Corporation | Optical fiber characteristic measuring system |
| CN103162866A (en) * | 2011-12-15 | 2013-06-19 | 西安金和光学科技有限公司 | Distributed type sensing device based on double-core double-wrapping layer optical fiber |
| CN103712639A (en) * | 2013-12-06 | 2014-04-09 | 何祖源 | Distributed rapid detection method and device of optical fiber Brillouin scattering spectrum |
| CN103698049A (en) * | 2013-12-18 | 2014-04-02 | 中国能源建设集团广东省电力设计研究院 | Brillouin-scattering-based distributed measurement system and method |
| CN208832125U (en) * | 2018-10-01 | 2019-05-07 | 江苏亨通光纤科技有限公司 | A kind of pipeline on-Line Monitor Device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109000157A (en) | 2018-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109000157B (en) | Online monitoring device and method for pipeline | |
| Rajeev et al. | Distributed optical fibre sensors and their applications in pipeline monitoring | |
| KR100945290B1 (en) | Pipe and system detecting breakdown and leakage of pipe by fiber-optic calbe | |
| GB2436142A (en) | Elongate structure monitoring with a fibre optic cable | |
| CN203868702U (en) | Underground pipeline leakage early-warning system based on fiber bragg grating sensors | |
| CN104596576A (en) | Optical fiber temperature sensing and vibration sensing collineation fusion system and monitoring method | |
| CN107990836A (en) | A kind of pipelines and petrochemical pipelines strain and temperature online monitoring system and method | |
| CN103912792A (en) | Telescoping underground pipeline leakage warning system on basis of fiber gratings and method implemented by telescoping underground pipeline leakage warning system | |
| CN201885733U (en) | Ultra-long-range fully-distributed optical fiber Rayleigh and Raman scattering sensor fused with optical fiber Raman frequency shifter | |
| CN111536892A (en) | Underground pipeline monitoring system and monitoring method based on distributed optical fiber sensing | |
| CN202100946U (en) | Monitoring device for pipeline leakage based on double-Sagnac optical fiber interferometers | |
| CN103939748A (en) | Underground pipeline leakage early warning system based on fiber bragg grating sensors and method thereof | |
| Huang et al. | Online monitoring of wire breaks in prestressed concrete cylinder pipe utilising fibre Bragg grating sensors | |
| CN102080953A (en) | Ultra-long-range (ULR) full-distributed optical Rayleigh and Raman scattering sensor fused with optical Raman frequency shifter | |
| CN101818640A (en) | Fully distributed device and method for monitoring underground working temperature of oil-water well based on Raman scattered light time-domain reflectometer | |
| CN203147289U (en) | Double-Sagnac pipeline safety monitoring system | |
| CN103632510A (en) | Pre-warning system for preventing high-voltage underground long-distance-transmission power cable from being damaged by external force | |
| CN102313141A (en) | Optical fiber vibration sensing system for pipeline leakage detection | |
| Myles | Permanent leak detection on pipes using a fibre optic based continuous sensor technology | |
| CN105157872A (en) | Cable temperature monitoring method and device | |
| CN204461469U (en) | A kind of optical fiber sensing and vibrating sensing collinear fusion system | |
| US10031043B2 (en) | Method and apparatus for detecting a structural fault in a structure using a brillouin gain spectrum obtained at a point along a sensing optical fiber | |
| CN208832125U (en) | A kind of pipeline on-Line Monitor Device | |
| CN211926782U (en) | Underground pipeline monitoring system based on distributed optical fiber sensing | |
| Gyger et al. | Ultra Long Range DTS (> 300km) to Support Deep Offshore and Long Tieback Developments |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |