CN113447727A - Method and device for positioning lightning above oil and gas pipeline based on optical fiber vibration measurement system - Google Patents
Method and device for positioning lightning above oil and gas pipeline based on optical fiber vibration measurement system Download PDFInfo
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- CN113447727A CN113447727A CN202110741269.5A CN202110741269A CN113447727A CN 113447727 A CN113447727 A CN 113447727A CN 202110741269 A CN202110741269 A CN 202110741269A CN 113447727 A CN113447727 A CN 113447727A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0842—Measurements related to lightning, e.g. measuring electric disturbances, warning systems
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The invention relates to a lightning positioning method above an oil and gas pipeline based on an optical fiber vibration measurement system, which comprises the following steps: acquiring vibration signals of a sensing optical cable along an oil and gas pipeline within a preset time period, and acquiring a vibration signal matrix within the preset time period according to the vibration signals within the preset time period; carrying out binarization on the vibration signal matrix to obtain a binarization matrix; and determining the position of the oil and gas pipeline closest to the thunder according to the connected domain and the binarized matrix area where the connected domain is located if the connected domain with the space distance span exceeding the set threshold exists in the binarized matrix. The method for positioning the lightning above the oil and gas pipeline based on the optical fiber vibration measurement system realizes positioning of the lightning above the oil and gas pipeline.
Description
Technical Field
The invention relates to the technical field of optical fiber sensing, in particular to a lightning positioning method and device above an oil and gas pipeline based on an optical fiber vibration measurement system, electronic equipment and a computer readable storage medium.
Background
When thunderstorm weather occurs, the phenomena of mechanical effect, thermal effect, electrostatic induction, electromagnetic induction and the like generated by lightning all affect the production and operation of the oil and gas pipeline. Lightning positioning refers to a method and a technology for determining the geographical position of lightning (so a thunderstorm) according to the natural electricity, and is mainly divided into multi-station positioning and single-station positioning; the lightning location has important significance for weather forecast, forest fire prevention, aviation, rocket, missile remote control and the like. And aiming at the lightning monitoring of the oil and gas pipeline, only the space above the pipeline along the line needs to be concerned, and the section of the oil and gas pipeline which is most affected by the lightning is found. And the prior art lacks the scheme of lightning location above the oil and gas pipeline.
Disclosure of Invention
In view of the above, it is desirable to provide a method, an apparatus, an electronic device and a computer readable storage medium for positioning lightning above an oil and gas pipeline based on an optical fiber vibration measurement system, so as to realize positioning of lightning above the oil and gas pipeline.
In order to achieve the purpose, the invention provides a lightning positioning method above an oil and gas pipeline based on an optical fiber vibration measurement system, which comprises the following steps:
acquiring vibration signals of a sensing optical cable along an oil and gas pipeline within a preset time period, and acquiring a vibration signal matrix within the preset time period according to the vibration signals within the preset time period;
carrying out binarization on the vibration signal matrix to obtain a binarization matrix;
and determining the position of the oil and gas pipeline closest to the thunder according to the connected domain and the binarized matrix area where the connected domain is located if the connected domain with the space distance span exceeding the set threshold exists in the binarized matrix.
Further, obtain the vibration signal of oil gas pipeline along sensing optical cable in the time quantum that predetermines, specifically include:
and taking the communication optical cable laid in the same ditch with the oil and gas pipeline as a sensing optical cable, and acquiring a vibration signal of the sensing optical cable along the oil and gas pipeline within a preset time period by using the sensing optical cable.
Further, the vibration signal of the oil and gas pipeline along the preset time period is acquired by using the sensing optical cable, and the method specifically comprises the following steps:
the whole sensing optical cable is divided into a plurality of sections, each section of sensing optical cable is used as a monitoring unit, the vibration signal of each monitoring unit is collected at a set sampling frequency, and the vibration signal of the sensing optical cable along the oil-gas pipeline in a preset time period is obtained.
Further, binarizing the vibration signal matrix to obtain a binarized matrix, which specifically includes: and determining a segmentation threshold value, and carrying out binarization on the vibration signal matrix by using the segmentation threshold value to obtain a binarization matrix.
Further, according to whether a connected domain with a space distance span exceeding a set threshold exists in the binarization matrix, the method specifically includes: and performing closed operation on the binarization matrix, filling the cavity of the binarization matrix to obtain a filled binarization matrix, and separating all connected domains in the binarization matrix according to the filled binarization matrix.
Further, according to the connected domain and the binarization matrix area where the connected domain is located, the position of the oil and gas pipeline closest to the thunder is determined, and the method specifically comprises the following steps:
taking the lower edge data of the connected domain to obtain a data sequence t, differentiating the data sequence t and taking an absolute value to obtain a sequence tdFor the sequence tdDifference is calculated and absolute value is taken to obtain a sequence tddObtaining the sequence tddAnd determining the position of the oil and gas pipeline closest to the lightning according to the standard deviation and the binarization matrix area where the connected domain is located.
Further, according to the standard deviation and the binarization matrix area where the connected domain is located, the position of the oil and gas pipeline closest to the thunder is determined, and the method specifically comprises the following steps:
judging whether a linear line segment exists in a binarization matrix area where a connected domain is located, if so, acquiring the linear line segment of which the absolute value of the slope is greater than a set slope threshold value, and acquiring the space coverage range of the linear line segment, wherein the standard deviation exceeds a set standard deviation threshold value, and the space coverage range of the linear line segment is greater than a set space coverage range threshold value, determining that a lightning signal exists on a sensing optical cable along the oil-gas pipeline, acquiring the bottommost point of the connected domain, and taking the position of the oil-gas pipeline corresponding to the point as the position of the oil-gas pipeline closest to lightning.
The invention also provides a lightning positioning device above the oil and gas pipeline based on the optical fiber vibration measurement system, which comprises a vibration signal matrix determining module, a binarization module and a position determining module;
the vibration signal matrix determining module is used for acquiring vibration signals of the sensing optical cable along the oil and gas pipeline within a preset time period and obtaining a vibration signal matrix within the preset time period according to the vibration signals within the preset time period;
the binarization module is used for binarizing the vibration signal matrix to obtain a binarization matrix;
and the position determining module is used for determining the position of the oil and gas pipeline closest to the thunder according to the connected domain of which the space distance span exceeds a set threshold value or not and the binarized matrix area in which the connected domain and the connected domain are located if the connected domain exists.
The invention also provides electronic equipment which comprises a memory and a processor, wherein the memory is stored with a computer program, and when the computer program is executed by the processor, the lightning positioning method above the oil and gas pipeline based on the optical fiber vibration measurement system is realized.
The invention also provides a computer readable storage medium, on which a computer program is stored, wherein the computer program is executed by a processor to implement the method for positioning the lightning above the oil and gas pipeline based on the optical fiber vibration measurement system according to any one of the above technical solutions.
The beneficial effects of adopting the above embodiment are: obtaining a vibration signal matrix in a preset time period according to a vibration signal in the preset time period by obtaining the vibration signal of a sensing optical cable along the oil and gas pipeline in the preset time period; carrying out binarization on the vibration signal matrix to obtain a binarization matrix; determining the position of an oil and gas pipeline closest to thunder according to the connected domain and the binarized matrix area where the connected domain is located if the connected domain with the space distance span exceeding the set threshold exists in the binarized matrix; the lightning above the oil and gas pipeline is positioned.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of a method for locating lightning above an oil and gas pipeline based on an optical fiber vibration measurement system provided by the invention;
FIG. 2 is an original image provided by an embodiment of the present invention;
fig. 3 is a binarized image after the close operation according to the embodiment of the present invention;
FIG. 4 is a connected domain image provided by an embodiment of the present invention;
FIG. 5 shows the result of extracting the lower edge of the lightning signal according to the embodiment of the present invention;
FIG. 6 shows the lightning location above the oil and gas pipeline provided by the embodiment of the present invention;
fig. 7 is a lightning positioning device above an oil and gas pipeline based on an optical fiber vibration measurement system according to an embodiment of the invention.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
The invention discloses a lightning positioning method above an oil and gas pipeline based on an optical fiber vibration measurement system, which has a flow schematic diagram, and as shown in figure 1, the method comprises the following steps:
s1, obtaining vibration signals of the sensing optical cable along the oil and gas pipeline within a preset time period, and obtaining a vibration signal matrix within the preset time period according to the vibration signals within the preset time period;
step S2, binarizing the vibration signal matrix to obtain a binarized matrix;
and S3, determining the position of the oil and gas pipeline closest to the lightning according to the connected domain and the binarized matrix area where the connected domain is located if the connected domain with the space distance span exceeding the set threshold exists in the binarized matrix.
It should be noted that, by analyzing the collected lightning vibration wave signals, the vibration source with a great influence distance (several kilometers to dozens of kilometers) can mainly comprise negative pressure waves generated when an oil-gas valve is started or stopped, collision between a pipe cleaner and a pipe wall welding seam when the pipe cleaner travels in a pipeline, and vibration waves generated by lightning in several seconds; however, the data image formed by the vibration wave generated by the lightning is obviously different from the negative pressure wave vibration and the pig vibration. The data image formed by the negative pressure wave vibration and the pig vibration is in a very regular 'letter V' shape, because the vibration source is generated at the position of the pipe wall, the vibration wave is transmitted to the front and back directions along the metal pipe wall, the transmission speed is uniform, and when the vibration wave is transmitted to the front and back directions from the center of the vibration source, 2 straight lines are displayed in the image. The vibration source of the vibration wave generated by the lightning is positioned in the cloud layer, and the propagation medium of the vibration wave comprises the cloud layer, geological environments in various states and the like, so that the time of the vibration wave reaching each position of the detection optical cable accompanying the pipeline is not regular, an irregular snake-shaped curve is presented in the image, and the lowest point of the snake-shaped curve can be considered as the position closest to the lightning.
As a preferred embodiment, acquiring a vibration signal of a sensing optical cable along an oil and gas pipeline within a preset time period specifically includes:
and taking the communication optical cable laid in the same ditch with the oil and gas pipeline as a sensing optical cable, and acquiring a vibration signal of the sensing optical cable along the oil and gas pipeline within a preset time period by using the sensing optical cable.
In one specific embodiment, the communication optical cable is laid in the same ditch as the oil and gas pipeline as the sensing optical cable; on the whole optical fiber link, dividing the optical fiber into a plurality of small sections with equal length according to the distance, wherein each small section is used as a monitoring unit; at each moment, the vibration signal of each monitoring unit is collected, and the sampling rate can be set to be 100H.
As a preferred embodiment, the acquiring of the vibration signal along the oil and gas pipeline within the preset time period by using the sensing optical cable specifically includes:
the whole sensing optical cable is divided into a plurality of sections, each section of sensing optical cable is used as a monitoring unit, the vibration signal of each monitoring unit is collected at a set sampling frequency, and the vibration signal of the sensing optical cable along the oil-gas pipeline in a preset time period is obtained.
In a specific embodiment, the vibration signal data obtained at each time are spliced to obtain a whole section of vibration signal matrix within a preset time period (for example, 30s), the splicing method is that each column of the matrix corresponds to a time sequence sampling signal of a monitoring unit 30s (namely, the whole section of the optical cable is divided into a plurality of equidistant monitoring units, wherein the 30s time sequence sampling signal of the nth monitoring unit is in the nth column of the matrix), an optical fiber vibration data image is drawn according to the whole section of vibration signal matrix (the numerical value of the vibration intensity signal collected by the optical cable is mapped between 0 and 255 and then drawn into the optical fiber vibration data image, the optical fiber vibration data image reflects the time and space distribution information of the vibration excitation signal collected by the whole section of the optical cable, and the duration and the space influence range of certain excitation can be checked from the information), and the physical meaning of the horizontal axis direction of the matrix is a space distance, the vertical physical meaning of the matrix is time (the time update direction is from top to bottom, i.e., the time of the upper display signal is newer).
As a preferred embodiment, the binarizing the vibration signal matrix to obtain a binarized matrix specifically includes: and determining a segmentation threshold value, and carrying out binarization on the vibration signal matrix by using the segmentation threshold value to obtain a binarization matrix.
In a specific embodiment, an OTSU law is used to obtain a segmentation threshold, a portion of the vibration signal matrix smaller than or equal to the segmentation threshold is set to 0, a portion of the vibration signal matrix larger than the segmentation threshold is set to 1, and the vibration signal matrix is binarized to obtain a binarization matrix.
As a preferred embodiment, the method specifically includes, according to whether a connected domain whose spatial distance span exceeds a set threshold exists in the binarization matrix: and performing closed operation on the binarization matrix, filling the cavity of the binarization matrix to obtain a filled binarization matrix, and separating all connected domains in the binarization matrix according to the filled binarization matrix.
In a specific embodiment, connected domain analysis is performed on the obtained binarization matrix to obtain a connected domain, and the connected domain analysis specifically comprises the steps of performing closed operation on the binarization matrix and filling holes between image blocks; scanning the binary matrix image after the closed operation line by line, calling a sequence formed by continuous first monitoring units in each line as a group, and recording a starting point and an end point of the group and a line number of the group; for a blob in all rows except the first row, if it has no overlap region with all blobs in the previous row, giving it a new label; if it has an overlap region with only one blob in the previous row, assigning it the reference number of the blob in the previous row; if it has an overlapping area with more than 2 clusters in the previous row, then the current cluster is assigned a minimum label of the connected cluster, and the labels of the clusters in the previous row are written into the equivalent pair, which shows that they belong to one class; converting the equivalent pairs into equivalent sequences, each sequence being given the same reference numeral; starting to traverse the marks of the clusters, searching equivalent sequences, starting from 1, and giving each equivalent sequence a mark number; and filling the label of each group into the binary matrix image after the label closing operation, and separating each connected domain.
As a preferred embodiment, determining the position of the oil and gas pipeline closest to the lightning according to the connected domain and the binarization matrix region where the connected domain is located specifically includes:
taking the lower edge data of the connected domain to obtain a data sequence t, differentiating the data sequence t and taking an absolute value to obtain a sequence tdTo the sequencetdDifference is calculated and absolute value is taken to obtain a sequence tddObtaining the sequence tddAnd determining the position of the oil and gas pipeline closest to the lightning according to the standard deviation and the binarization matrix area where the connected domain is located.
In a specific embodiment, whether a connected domain with a space distance span exceeding a set threshold (for example, 1km) exists is judged, one connected domain represents one external vibration excitation, namely whether a single vibration excitation signal influencing the space range exceeding the set threshold exists is judged, if yes, lightning signals are judged, and if not, vibration detection signals of all monitoring units are collected again; for the lightning signal judgment, the steps are that for the connected domain meeting the space span condition, the data of the lower edge of the connected domain is extracted to obtain a data sequence t (the physical meaning is that each detection unit which is continuously arranged receives the moment of the same vibration source signal); the difference is calculated for the data sequence t and the absolute value is taken to obtain the sequence td(namely the time difference of receiving the same vibration source signal by each monitoring unit) and then comparing tdDifference is calculated and absolute value is taken to obtain a sequence tdd(i.e., the difference between the time differences), and then the sequence t is calculatedddStandard deviation of std.
As a preferred embodiment, determining the position of the oil and gas pipeline closest to the lightning according to the standard deviation and the binarization matrix region where the connected domain is located specifically includes:
judging whether a linear line segment exists in a binarization matrix area where a connected domain is located, if so, acquiring the linear line segment of which the absolute value of the slope is greater than a set slope threshold value, and acquiring the space coverage range of the linear line segment, wherein the standard deviation exceeds a set standard deviation threshold value, and the space coverage range of the linear line segment is greater than a set space coverage range threshold value, determining that a lightning signal exists on a sensing optical cable along the oil-gas pipeline, acquiring the bottommost point of the connected domain, and taking the position of the oil-gas pipeline corresponding to the point as the position of the oil-gas pipeline closest to lightning.
In one embodiment, the binarization matrix area of the connected domain is subjected to Hough transform, and the area is judgedIf the linear line segment exists, screening out the linear line segment with the slope less than-10 and the linear line segment with the slope greater than 10, and counting the space coverage range l of the linear line segment with the slope less than-10-kAnd the space coverage range l of the linear segment with the slope larger than 10k(the slope threshold k here takes the value 10); if std exceeds the threshold Tstd (value 0.7), and l-kAnd lkIf the values are less than the threshold value TL (the value can be 300m), the optical fiber is considered as a lightning signal, and the optical fiber position closest to lightning is judged; otherwise, the vibration of the oil and gas pipeline (negative pressure wave for starting and stopping the valve, collision of pipe cleaner operation and the like) can be considered, and judgment is not needed. For judging the position of the optical fiber closest to the lightning, finding the bottommost point of the connected domain can be regarded as the position closest to the lightning.
In another specific embodiment, taking the collected primary lightning vibration signal as an example to obtain an original image, as shown in fig. 2, obtaining a binary image after the closed operation, as shown in fig. 3, obtaining a connected domain image, as shown in fig. 4, where the spatial (transverse) coverage range of only one connected domain in fig. 4 exceeds 100 points (1 point corresponds to 10m, and 100 points are 1000m), extracting the lower edge of the lightning signal, as shown in fig. 5, and calculating a sequence tddHas a standard deviation std of 0.7662, exceeding the threshold value of 0.7; through hough transformation, no straight line with spatial (lateral) coverage exceeding 300m is found in the picture. The lightning signal judgment conditions are all met; and acquiring the lowest point of the found connected domain, namely the position closest to the lightning, and positioning the lightning above the oil and gas pipeline, wherein the positioning result is shown as a triangle in fig. 6, and the positioning result is shown as a triangle in fig. 6.
The embodiment of the invention provides a lightning positioning device above an oil and gas pipeline based on an optical fiber vibration measurement system, which has a structural block diagram, and as shown in fig. 7, comprises a vibration signal matrix determining module 1, a binarization module 2 and a position determining module 3;
the vibration signal matrix determining module 1 is used for acquiring vibration signals of the sensing optical cable along the oil and gas pipeline within a preset time period and obtaining a vibration signal matrix within the preset time period according to the vibration signals within the preset time period;
the binarization module 2 is used for binarizing the vibration signal matrix to obtain a binarization matrix;
and the position determining module 3 is used for determining the position of the oil and gas pipeline closest to the thunder according to the connected domain of which the space distance span exceeds a set threshold value or not and the binarized matrix area in which the connected domain and the connected domain are located if the connected domain exists.
The embodiment of the invention provides electronic equipment which comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the method for positioning lightning above an oil and gas pipeline based on an optical fiber vibration measurement system is realized.
The embodiment of the invention provides a computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and the computer program is used for realizing the method for positioning lightning above an oil and gas pipeline based on the optical fiber vibration measurement system, which is described in any one of the above embodiments, when the computer program is executed by a processor.
The invention discloses a lightning positioning method, a lightning positioning device, electronic equipment and a computer readable storage medium above an oil-gas pipeline based on an optical fiber vibration measurement system, wherein a vibration signal of a sensing optical cable along the oil-gas pipeline within a preset time period is obtained, and a vibration signal matrix within the preset time period is obtained according to the vibration signal within the preset time period; carrying out binarization on the vibration signal matrix to obtain a binarization matrix; determining the position of an oil and gas pipeline closest to thunder according to the connected domain and the binarized matrix area where the connected domain is located if the connected domain with the space distance span exceeding the set threshold exists in the binarized matrix; the lightning above the oil and gas pipeline is positioned.
According to the technical scheme, the communication optical cable laid in the same ditch as the oil and gas pipeline is used for collecting vibration signals along the optical cable, and the lightning generation position above the oil and gas pipeline is positioned by analyzing the vibration signals when lightning occurs. According to the technical scheme, vibration of the oil and gas pipeline (negative pressure wave for starting and stopping the valve, operation collision of the pipe cleaner and the like) and lightning vibration wave can be effectively distinguished, the position closest to lightning in a link of the oil and gas pipeline can be found, the lightning generating position above the oil and gas pipeline is positioned, and a reference basis is provided for operation management of the oil and gas pipeline.
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program, which is stored in a computer readable storage medium, to instruct related hardware. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A lightning positioning method above an oil and gas pipeline based on an optical fiber vibration measurement system is characterized by comprising the following steps:
acquiring vibration signals of a sensing optical cable along an oil and gas pipeline within a preset time period, and acquiring a vibration signal matrix within the preset time period according to the vibration signals within the preset time period;
carrying out binarization on the vibration signal matrix to obtain a binarization matrix;
and determining the position of the oil and gas pipeline closest to the thunder according to the connected domain and the binarized matrix area where the connected domain is located if the connected domain with the space distance span exceeding the set threshold exists in the binarized matrix.
2. The method for positioning lightning above an oil and gas pipeline based on the optical fiber vibration measurement system according to claim 1, wherein obtaining vibration signals of the sensing optical cable along the oil and gas pipeline within a preset time period specifically comprises:
and taking the communication optical cable laid in the same ditch with the oil and gas pipeline as a sensing optical cable, and acquiring a vibration signal of the sensing optical cable along the oil and gas pipeline within a preset time period by using the sensing optical cable.
3. The method for positioning lightning above an oil and gas pipeline based on the optical fiber vibration measurement system according to claim 2, wherein the vibration signals along the oil and gas pipeline within a preset time period are acquired by using the sensing optical cable, and the method specifically comprises the following steps:
the whole sensing optical cable is divided into a plurality of sections, each section of sensing optical cable is used as a monitoring unit, the vibration signal of each monitoring unit is collected at a set sampling frequency, and the vibration signal of the sensing optical cable along the oil-gas pipeline in a preset time period is obtained.
4. The method for locating the lightning above the oil and gas pipeline based on the optical fiber vibration measurement system according to claim 1, wherein the vibration signal matrix is binarized to obtain a binarized matrix, which specifically comprises: and determining a segmentation threshold value, and carrying out binarization on the vibration signal matrix by using the segmentation threshold value to obtain a binarization matrix.
5. The method for positioning lightning above an oil and gas pipeline based on the optical fiber vibration measurement system according to claim 1, wherein the method specifically comprises the following steps of according to whether the binary matrix has a connected domain with a space distance span exceeding a set threshold value: and performing closed operation on the binarization matrix, filling the cavity of the binarization matrix to obtain a filled binarization matrix, and separating all connected domains in the binarization matrix according to the filled binarization matrix.
6. The method for positioning lightning above an oil and gas pipeline based on the optical fiber vibration measurement system according to claim 1, wherein the position of the oil and gas pipeline closest to the lightning is determined according to the connected domain and the binarization matrix area where the connected domain is located, and specifically comprises the following steps:
taking the lower edge data of the connected domain to obtain a data sequence t, differentiating the data sequence t and taking an absolute value to obtain a sequencetdFor the sequence tdDifference is calculated and absolute value is taken to obtain a sequence tddObtaining the sequence tddAnd determining the position of the oil and gas pipeline closest to the lightning according to the standard deviation and the binarization matrix area where the connected domain is located.
7. The method for locating the lightning above the oil and gas pipeline based on the optical fiber vibration measurement system according to claim 6, wherein the position of the oil and gas pipeline closest to the lightning is determined according to the standard deviation and the binarization matrix region where the connected domain is located, and specifically comprises:
judging whether a linear line segment exists in a binarization matrix area where a connected domain is located, if so, acquiring the linear line segment of which the absolute value of the slope is greater than a set slope threshold value, and acquiring the space coverage range of the linear line segment, wherein the standard deviation exceeds a set standard deviation threshold value, and the space coverage range of the linear line segment is greater than a set space coverage range threshold value, determining that a lightning signal exists on a sensing optical cable along the oil-gas pipeline, acquiring the bottommost point of the connected domain, and taking the position of the oil-gas pipeline corresponding to the point as the position of the oil-gas pipeline closest to lightning.
8. A lightning positioning device above an oil and gas pipeline based on an optical fiber vibration measurement system is characterized by comprising a vibration signal matrix determining module, a binarization module and a position determining module;
the vibration signal matrix determining module is used for acquiring vibration signals of the sensing optical cable along the oil and gas pipeline within a preset time period and obtaining a vibration signal matrix within the preset time period according to the vibration signals within the preset time period;
the binarization module is used for binarizing the vibration signal matrix to obtain a binarization matrix;
and the position determining module is used for determining the position of the oil and gas pipeline closest to the thunder according to the connected domain of which the space distance span exceeds a set threshold value or not and the binarized matrix area in which the connected domain and the connected domain are located if the connected domain exists.
9. An electronic device comprising a memory and a processor, the memory having stored thereon a computer program which, when executed by the processor, implements the method of lightning location over an oil and gas pipeline based on a fiber optic vibration measurement system of any one of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method for lightning location above an oil and gas pipeline based on a fiber optic vibration measurement system according to any one of claims 1-7.
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| CN202110741269.5A CN113447727B (en) | 2021-06-30 | 2021-06-30 | Method and device for positioning lightning above oil and gas pipeline based on optical fiber vibration measurement system |
| PCT/CN2022/097590 WO2023273820A1 (en) | 2021-06-30 | 2022-06-08 | Method and apparatus for positioning thunder and lightning above oil and gas pipelines on basis of optical fiber vibration measurement system |
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| CN202110741269.5A CN113447727B (en) | 2021-06-30 | 2021-06-30 | Method and device for positioning lightning above oil and gas pipeline based on optical fiber vibration measurement system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114387748A (en) * | 2022-01-29 | 2022-04-22 | 湖北闪复管道科技有限公司 | Anti-interference perimeter intrusion alarm system based on positioning type optical fiber multi-dimensional protection |
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