Optical fiber composite detection method and device for buried pipeline leakage

Abstract

The invention provides a buried pipeline leakage optical fiber composite detection method and device, and the method comprises the steps: S1, obtaining the sound wave information of a to-be-detected optical fiber through an optical fiber sound detection method; the to-be-tested optical fiber is mounted near a to-be-tested buried pipeline; s2, determining initial condition information of the buried pipeline to be detected based on the sound wave information; if the initial condition information is normal, returning to the step S1; if the initial condition information is abnormal, determining abnormal location; s3, determining the temperature value of the soil around the abnormal positioning through an optical fiber temperature measurement method; s4, determining target condition information of the buried pipeline to be measured according to the temperature value of the soil around the abnormal positioning; if the target condition information is abnormal, determining that the buried pipeline to be detected leaks, and giving an alarm; and if the target condition information is normal, returning to the step S1. Therefore, the alarm accuracy and timeliness are improved.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline transportation, and in particular to a method and a device for detecting leakage of buried pipelines using optical fiber composites. Background Art

[0002] With the vigorous development of oil and gas pipeline construction, the risk of oil and gas pipeline leakage has become increasingly prominent. Once a pipeline leaks, it will not only cause property losses and environmental pollution, but also threaten the lives and safety of people in the surrounding areas.

[0003] In recent years, the method of using pipeline accompanying optical cables as distributed sensors to realize leakage detection and alarm in the entire pipeline has been increasingly used. However, at this stage, the fiber optic acoustic measurement method has the disadvantage of a high false alarm rate, while the fiber optic temperature measurement method has the disadvantage of a long response time. Summary of the invention

[0004] The present invention provides a buried pipeline leakage optical fiber composite detection method and device, which are used to overcome the problems of high false alarm rate and long response time in the existing detection methods and improve the alarm accuracy and timeliness.

[0005] In a first aspect, the present invention provides a method for detecting buried pipeline leakage using optical fiber composite, comprising:

[0006] S1, obtaining the acoustic wave information of the optical fiber to be tested by the optical fiber acoustic measurement method; the optical fiber to be tested is installed near the buried pipeline to be tested;

[0007] S2, based on the acoustic wave information, determining the initial situation information of the buried pipeline to be tested; if the initial situation information is normal, returning to step S1; if the initial situation information is abnormal, determining the abnormality location;

[0008] S3, determining the temperature value of the soil around the abnormal location by optical fiber temperature measurement method;

[0009] S4, determining the target condition information of the buried pipeline to be tested according to the temperature value of the soil around the abnormal location; if the target condition information is abnormal, determining that the buried pipeline to be tested has a leakage and issuing an alarm; if the target condition information is normal, returning to step S1.

[0010] Optionally, step S4 includes:

[0011] S41, obtaining the regional temperature averages of the buried pipeline to be tested in different detection areas and the period temperature averages in different time periods;

[0012] S42, obtaining the regional alarm threshold of the abnormal location;

[0013] S43, judging whether the temperature difference between the temperature value and the temperature average of the time period exceeds the regional alarm threshold, or whether the temperature difference between the temperature value and the temperature average of the time period exceeds the regional alarm threshold of the abnormal location; if so, determining whether the buried pipeline to be tested has a leak; if not, returning to step S1.

[0014] Optionally, before step S43, the following steps are further included:

[0015] Temporarily lower the regional alarm threshold for the abnormal location.

[0016] Optionally, step S2 includes:

[0017] S21, inputting an optical pulse signal into the optical fiber to be tested, generating Rayleigh scattering in the optical fiber laid along the buried pipeline to be tested, and obtaining a scattered signal image;

[0018] S22, converting the scattered signal image into a scattered signal waveform, and performing differential analysis on the scattered signal waveform to obtain corresponding signal features;

[0019] S23: Determine the initial situation information of the buried pipeline to be tested based on the signal characteristics.

[0020] In a second aspect, the present invention provides a buried pipeline leakage optical fiber composite detection device, comprising:

[0021] An acquisition module is used to acquire the acoustic wave information of the optical fiber to be tested by using an optical fiber acoustic measurement method; the optical fiber to be tested is installed near the buried pipeline to be tested;

[0022] An initial situation information determination module is used to determine the initial situation information of the buried pipeline to be tested based on the acoustic wave information; if the initial situation information is normal, return to execute the acquisition module; if the initial situation information is abnormal, determine the abnormal location;

[0023] A temperature value acquisition module determines the temperature value of the soil around the abnormal location by using an optical fiber temperature measurement method;

[0024] The target situation information determination module is used to determine the target situation information of the buried pipeline to be tested according to the temperature value of the soil around the abnormal location; if the target situation information is abnormal, it is determined that there is a leakage in the buried pipeline to be tested and an alarm is issued; if the target situation information is normal, it returns to execute the acquisition module.

[0025] Optionally, the target situation information determination module includes:

[0026] The mean value acquisition submodule is used to obtain the regional temperature mean values ​​of the buried pipeline to be tested in different detection areas, and the period temperature mean values ​​in different time periods;

[0027] A threshold automatic acquisition submodule is used to obtain the regional alarm threshold of the abnormal positioning;

[0028] The judgment submodule is used to judge whether the temperature difference between the temperature value and the temperature average of the time period exceeds the regional alarm threshold, or whether the temperature difference between the temperature value and the temperature average of the time period exceeds the regional alarm threshold of the abnormal location; if so, it is determined that there is a leakage in the buried pipeline to be tested; if not, it returns to the acquisition module.

[0029] Optionally, the target situation information determination module further includes:

[0030] The threshold adjustment submodule is used to temporarily reduce the regional alarm threshold of the abnormal positioning.

[0031] Optionally, the initial situation information determination module includes:

[0032] An input submodule, used for inputting an optical pulse signal into the optical fiber to be tested, generating Rayleigh scattering in the optical fiber laid along the buried pipeline to be tested, and obtaining a scattered signal image;

[0033] A differential analysis submodule, used for converting the scattered signal image into a scattered signal waveform, and performing differential analysis on the scattered signal waveform to obtain corresponding signal features;

[0034] The initial situation information determination submodule is used to determine the initial situation information of the buried pipeline to be tested based on the signal characteristics.

[0035] In a third aspect, the present application provides an electronic device, comprising a processor and a memory, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the steps in the method provided in the first aspect are performed.

[0036] In a fourth aspect, the present application provides a storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps in the method provided in the first aspect are performed.

[0037] It can be seen from the above technical solutions that the present invention has the following advantages:

[0038] The present invention provides a method and device for detecting buried pipeline leakage using optical fiber composites, the method comprising:

[0039] S1, obtain the acoustic wave information of the optical fiber to be tested by the optical fiber acoustic measurement method; the optical fiber to be tested is installed near the buried pipeline to be tested; S2, determine the initial situation information of the buried pipeline to be tested based on the acoustic wave information; if the initial situation information is normal, return to step S1; if the initial situation information is abnormal, determine the abnormal location; S3, determine the temperature value of the soil around the abnormal location by the optical fiber temperature measurement method; S4, determine the target situation information of the buried pipeline to be tested according to the temperature value of the soil around the abnormal location; if the target situation information is abnormal, determine that the buried pipeline to be tested has a leak and issue an alarm; if the target situation information is normal, return to step S1. In order to avoid the problem of high false alarm rate of the optical fiber acoustic measurement method, after the abnormal location is detected by the optical fiber acoustic measurement method, the optical fiber temperature measurement method is used to perform a composite judgment, thereby improving the accuracy and timeliness of the alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0041] Figure 1 A flowchart of a first embodiment of a method for detecting buried pipeline leakage using optical fiber composites according to the present invention;

[0042] Figure 2 A schematic diagram of a detection system of Embodiment 1 of a buried pipeline leakage optical fiber composite detection method of the present invention;

[0043] Figure 3 It is a schematic diagram of the existing detection system;

[0044] Figure 4 This is a flow chart of a second embodiment of a buried pipeline leakage optical fiber composite detection method of the present invention;

[0045] Figure 5 The present invention is a structural block diagram of an embodiment of an optical fiber composite detection device for buried pipeline leakage according to the present invention. DETAILED DESCRIPTION

[0046] The embodiment of the present invention provides a buried pipeline leakage optical fiber composite detection method and device, which are used to overcome the problems of high false alarm rate and long response time in the existing detection methods and improve the accuracy and timeliness of alarm.

[0047] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] For example, see Figure 1 , Figure 1 This is a flow chart of a first embodiment of a buried pipeline leakage optical fiber composite detection method of the present invention, comprising:

[0049] S1, obtaining the acoustic wave information of the optical fiber to be tested by the optical fiber acoustic measurement method; the optical fiber to be tested is installed near the buried pipeline to be tested;

[0050] It should be noted that the principle of using pipeline accompanying optical cables as distributed sensors to realize leakage detection and alarm throughout the pipeline is: when light propagates in the optical fiber, backscattering will occur. When vibration or temperature changes occur somewhere in the optical fiber, the intensity, frequency and other parameters of the scattered light will change. Then, by analyzing the information of the scattered light, the fiber optic acoustic measurement method or fiber optic temperature measurement method is used to realize leakage detection of buried pipelines equipped with optical fibers. Then, by calculating the time difference between the incident light and the returned scattered light, the leakage point can be located.

[0051] In addition, according to the different wavelengths of scattered light, it is divided into Rayleigh scattering, Brillouin scattering and Raman scattering. Usually, the fiber optic acoustic measurement method uses Rayleigh scattering to judge the leakage by detecting the leakage noise at the leakage point; the fiber optic temperature measurement uses Brillouin scattering and Raman scattering to judge the leakage by detecting the temperature change at the leakage point.

[0052] S2, based on the acoustic wave information, determining the initial situation information of the buried pipeline to be tested; if the initial situation information is normal, returning to step S1; if the initial situation information is abnormal, determining the abnormality location;

[0053] S3, determining the temperature value of the soil around the abnormal location by optical fiber temperature measurement method;

[0054] S4, determining the target condition information of the buried pipeline to be tested according to the temperature value of the soil around the abnormal location; if the target condition information is abnormal, determining that the buried pipeline to be tested has a leakage and issuing an alarm; if the target condition information is normal, returning to step S1.

[0055] In an optional embodiment, the step S4 includes:

[0056] S41, obtaining the regional temperature averages of the buried pipeline to be tested in different detection areas and the period temperature averages in different time periods;

[0057] S42, obtaining the regional alarm threshold of the abnormal location;

[0058] S43, judging whether the temperature difference between the temperature value and the temperature average of the time period exceeds the regional alarm threshold, or whether the temperature difference between the temperature value and the temperature average of the time period exceeds the regional alarm threshold of the abnormal location; if so, determining whether the buried pipeline to be tested has a leak; if not, returning to step S1.

[0059] It should be noted that since the temperature around the optical fiber can vary greatly with the change of seasons, and even the temperature can be different between day and night, and the temperature at different distances and locations along the optical fiber can also be different, optical fiber temperature measurement usually adopts the practice of setting different alarm values ​​in sections and regions. In order to reduce false alarms caused by normal temperature fluctuations, the alarm value usually takes a larger margin, and an alarm will only be triggered when the temperature changes significantly, resulting in a long alarm response time.

[0060] The buried pipeline leakage optical fiber composite detection method of the embodiment of the present invention is applied to Figure 2 In the detection system shown in the figure, the detection system consists of an optical cable 1, a temperature and sound measuring host 2, a server 3 and an operation station 4. Figure 3 The existing detection system shown, which is composed of an optical cable 1, a temperature measuring host 21, a sound measuring host 22, two servers 3, and two operating stations 4, directly integrates the temperature measuring host 21 and the sound measuring host 22, which can effectively reduce the cost of hardware, and can directly combine the characteristics of the two detection principles in the algorithm, and combine and optimize them.

[0061] The optical fiber composite detection method for buried pipeline leakage provided in the embodiment of the present invention includes: S1, obtaining the acoustic wave information of the optical fiber to be tested by the optical fiber acoustic measurement method; the optical fiber to be tested is installed near the buried pipeline to be tested; S2, determining the initial situation information of the buried pipeline to be tested based on the acoustic wave information; if the initial situation information is normal, returning to step S1; if the initial situation information is abnormal, determining the abnormal location; S3, determining the temperature value of the soil around the abnormal location by the optical fiber temperature measurement method; S4, determining the target situation information of the buried pipeline to be tested according to the temperature value of the soil around the abnormal location; if the target situation information is abnormal, determining that the buried pipeline to be tested has a leak and issuing an alarm; if the target situation information is normal, returning to step S1. In order to avoid the problem of high false alarm rate of the optical fiber acoustic measurement method, after the abnormal location is detected by the optical fiber acoustic measurement method, the optical fiber temperature measurement method is used to perform a composite judgment, thereby improving the accuracy and timeliness of the alarm.

[0062] For example 2, please refer to Figure 4 , Figure 4 The flowchart of Embodiment 2 of a method for detecting buried pipeline leakage using optical fiber composite is shown in the following figure:

[0063] Step S201, obtaining the acoustic wave information of the optical fiber to be tested by the optical fiber acoustic measurement method; the optical fiber to be tested is installed near the buried pipeline to be tested;

[0064] It should be noted that for the fiber optic acoustic measurement method, since the noise emitted by pipeline leakage is relatively small (especially small hole leakage), and the background noise around the optical fiber is relatively complex, such as passing cars and construction sites around, which will bring noise interference. Although the fiber optic acoustic measurement system itself also has functions such as event recognition and noise elimination, the risk of false alarms is still very high.

[0065] Step S202, inputting an optical pulse signal into the optical fiber to be tested, generating Rayleigh scattering in the optical fiber laid along the buried pipeline to be tested, and obtaining a scattered signal image;

[0066] Step S203, converting the scattered signal image into a scattered signal waveform, and performing differential analysis on the scattered signal waveform to obtain corresponding signal features;

[0067] Step S204, determining the initial situation information of the buried pipeline to be tested based on the signal characteristics;

[0068] In the embodiment of the present invention, the detection and location of pipeline faults is one of the important tasks of the fiber optic acoustic measurement method in pipeline detection applications. The basic idea is to use Rayleigh scattering to detect fault signals inside the pipeline, and to achieve fault location and identification by analyzing and comparing the fault signals.

[0069] In a specific implementation, the following steps are included: (1) Arrange the optical fiber sensor and install it inside or outside the pipeline, and ensure that the position and direction of the optical fiber end face remain unchanged. (2) The laser inputs the optical signal into the optical fiber to form a continuous light beam. (3) When the light beam propagates to the surface of the pipeline, Rayleigh scattering is generated, and some weak signals are scattered, forming a scattered signal image in the optical fiber. These scattered light signals can be transmitted back by the optical fiber. (4) At the receiving terminal, the returned light beam signal is collected and converted into an electrical signal through a photoelectric converter. (5) After amplification, processing, demodulation and other operations, the corresponding scattered signal waveform can be obtained, and differential analysis is performed to determine the characteristics of the acoustic wave scattering signal, including frequency, amplitude, phase, time delay, etc. (6) The obtained data is processed and analyzed. By comparing the differences in the scattered signals, it can be determined whether there is a fault in the pipeline, including pipeline rupture, corrosion, deformation and other problems. If a fault is detected, it is necessary to analyze and compare the fault signal to determine its position and range, so as to locate and identify the fault.

[0070] The application of fiber optic acoustic measurement in pipeline inspection through Rayleigh scattering can have the characteristics of non-contact, high resolution and high precision. It can detect and locate pipeline fault signals that are difficult to observe and detect, and provide an effective technical means for pipeline maintenance and transformation.

[0071] Step S205, determining the temperature value of the soil around the abnormal location by optical fiber temperature measurement method;

[0072] Step S206, obtaining the regional temperature averages of the buried pipeline to be tested in different detection areas and the period temperature averages in different time periods;

[0073] Step S207, obtaining the regional alarm threshold of the abnormal location;

[0074] Step S208, determine whether the temperature difference between the temperature value and the average temperature of the time period exceeds the regional alarm threshold or whether the temperature difference between the temperature value and the average temperature of the time period exceeds the regional alarm threshold of the abnormal location; if so, determine that the buried pipeline to be tested has a leak; if not, return to step S201.

[0075] In an optional embodiment, before step S208, the method further includes:

[0076] Temporarily lower the regional alarm threshold for the abnormal location.

[0077] The present invention uses the alarm of the optical fiber acoustic measurement method as the basis, and after identifying a possible leakage alarm, it locates the event. The optical fiber temperature sensing automatically reduces the regional alarm threshold of abnormal location, that is, a smaller alarm margin is taken compared to the regional alarm threshold of abnormal location to replace the current regional alarm threshold, thereby improving its sensitivity.

[0078] In an embodiment of the present invention, whether the temperature value of the soil around the abnormal location and the difference between the regional temperature average of different detection areas or the period temperature average in different time periods exceed the regional alarm threshold and / or whether the temperature difference between the temperature value and the period temperature average exceeds the regional alarm threshold of the abnormal location is determined, thereby determining whether the buried pipeline to be tested has a leak.

[0079] This method can automatically adjust the temperature alarm value of the potential leakage area in a targeted manner, while the alarm value of other areas remains unchanged, which can avoid false alarms, focus on the potential leakage area found by the acoustic measurement method, and speed up the alarm time of the temperature measurement method. The combination of the two can ensure the rapid response of the alarm and greatly improve the accuracy of leak detection.

[0080] An optical fiber composite detection method for buried pipeline leakage provided in an embodiment of the present invention includes:

[0081] S1, obtain the acoustic wave information of the optical fiber to be tested by the optical fiber acoustic measurement method; the optical fiber to be tested is installed near the buried pipeline to be tested; S2, determine the initial situation information of the buried pipeline to be tested based on the acoustic wave information; if the initial situation information is normal, return to step S1; if the initial situation information is abnormal, determine the abnormal location; S3, determine the temperature value of the soil around the abnormal location by the optical fiber temperature measurement method; S4, determine the target situation information of the buried pipeline to be tested according to the temperature value of the soil around the abnormal location; if the target situation information is abnormal, determine that the buried pipeline to be tested has a leak and issue an alarm; if the target situation information is normal, return to step S1. In order to avoid the problem of high false alarm rate of the optical fiber acoustic measurement method, after the abnormal location is detected by the optical fiber acoustic measurement method, the optical fiber temperature measurement method is used to perform a composite judgment, thereby improving the accuracy and timeliness of the alarm. In addition, by automatically adjusting the optical fiber temperature sensing alarm threshold at the abnormal location, the alarm response speed of the optical fiber temperature measurement method is greatly improved.

[0082] For example 3, please refer to Figure 5 , Figure 5 The structure diagram of an embodiment of an optical fiber composite detection device for buried pipeline leakage of the present invention comprises:

[0083] The acquisition module 501 is used to acquire the acoustic wave information of the optical fiber to be tested by using the optical fiber acoustic measurement method; the optical fiber to be tested is installed near the buried pipeline to be tested;

[0084] The initial situation information determination module 502 is used to determine the initial situation information of the buried pipeline to be tested based on the acoustic wave information; if the initial situation information is normal, return to execute the acquisition module; if the initial situation information is abnormal, determine the abnormal location;

[0085] The temperature value acquisition module 503 determines the temperature value of the soil around the abnormal location by using an optical fiber temperature measurement method;

[0086] The target situation information determination module 504 is used to determine the target situation information of the buried pipeline to be tested according to the temperature value of the soil around the abnormal location; if the target situation information is abnormal, it is determined that there is a leakage in the buried pipeline to be tested and an alarm is issued; if the target situation information is normal, it returns to execute the acquisition module.

[0087] In an optional embodiment, the target situation information determination module 504 includes:

[0088] The mean value acquisition submodule is used to obtain the regional temperature mean values ​​of the buried pipeline to be tested in different detection areas, and the period temperature mean values ​​in different time periods;

[0089] A threshold automatic acquisition submodule is used to obtain the regional alarm threshold of the abnormal positioning;

[0090] The judgment submodule is used to judge whether the temperature difference between the temperature value and the temperature average of the time period exceeds the regional alarm threshold, or whether the temperature difference between the temperature value and the temperature average of the time period exceeds the regional alarm threshold of the abnormal location; if so, it is determined that there is a leakage in the buried pipeline to be tested; if not, it returns to the acquisition module.

[0091] In an optional embodiment, the target situation information determination module 504 further includes:

[0092] The threshold adjustment submodule is used to temporarily reduce the regional alarm threshold of the abnormal positioning.

[0093] In an optional embodiment, the initial situation information determination module 502 includes:

[0094] An input submodule, used for inputting an optical pulse signal into the optical fiber to be tested, generating Rayleigh scattering in the optical fiber laid along the buried pipeline to be tested, and obtaining a scattered signal image;

[0095] A differential analysis submodule, used for converting the scattered signal image into a scattered signal waveform, and performing differential analysis on the scattered signal waveform to obtain corresponding signal features;

[0096] The initial situation information determination submodule is used to determine the initial situation information of the buried pipeline to be tested based on the signal characteristics.

[0097] An embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of a buried pipeline leakage optical fiber composite detection method as described in any of the above embodiments.

[0098] An embodiment of the present invention further provides a computer storage medium on which a computer program is stored. When the computer program is executed by the processor, the steps of the optical fiber composite detection method for buried pipeline leakage as described in any of the above embodiments are implemented.

[0099] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0100] In the several embodiments provided in the present application, it should be understood that the methods, devices, electronic devices and storage media disclosed in the present invention can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0101] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0102] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0103] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a readable storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned readable storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0104] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting buried pipeline leakage by optical fiber composite, characterized in that: include: S1, obtaining the acoustic wave information of the optical fiber to be tested by the optical fiber acoustic measurement method; the optical fiber to be tested is installed near the buried pipeline to be tested; S2, based on the acoustic wave information, determining the initial situation information of the buried pipeline to be tested; if the initial situation information is normal, returning to step S1; if the initial situation information is abnormal, determining the abnormality location; S3, determining the temperature value of the soil around the abnormal location by optical fiber temperature measurement method; S4, determining the target condition information of the buried pipeline to be tested according to the temperature value of the soil around the abnormal location; if the target condition information is abnormal, determining that the buried pipeline to be tested has a leakage and issuing an alarm; if the target condition information is normal, returning to step S1.

2. The optical fiber composite detection method for buried pipeline leakage according to claim 1 is characterized in that: The step S4 comprises: S41, obtaining the regional temperature averages of the buried pipeline to be tested in different detection areas and the period temperature averages in different time periods; S42, obtaining the regional alarm threshold of the abnormal location; S43, judging whether the temperature difference between the temperature value and the temperature average of the time period exceeds the regional alarm threshold, or whether the temperature difference between the temperature value and the temperature average of the time period exceeds the regional alarm threshold of the abnormal location; if so, determining whether the buried pipeline to be tested has a leak; if not, returning to step S1.

3. The optical fiber composite detection method for buried pipeline leakage according to claim 2 is characterized in that: Before step S43, the following steps are also included: Temporarily lower the regional alarm threshold for the abnormal location.

4. The optical fiber composite detection method for buried pipeline leakage according to claim 2, characterized in that: The step S2 comprises: S21, inputting an optical pulse signal into the optical fiber to be tested, generating Rayleigh scattering in the optical fiber laid along the buried pipeline to be tested, and obtaining a scattered signal image; S22, converting the scattered signal image into a scattered signal waveform, and performing differential analysis on the scattered signal waveform to obtain corresponding signal features; S23: Determine the initial situation information of the buried pipeline to be tested based on the signal characteristics.

5. A buried pipeline leakage optical fiber composite detection device, characterized in that: include: An acquisition module is used to acquire the acoustic wave information of the optical fiber to be tested by using an optical fiber acoustic measurement method; The optical fiber to be tested is installed near the buried pipeline to be tested; An initial situation information determination module is used to determine the initial situation information of the buried pipeline to be tested based on the acoustic wave information; if the initial situation information is normal, return to execute the acquisition module; if the initial situation information is abnormal, determine the abnormal location; A temperature value acquisition module determines the temperature value of the soil around the abnormal location by using an optical fiber temperature measurement method; The target situation information determination module is used to determine the target situation information of the buried pipeline to be tested according to the temperature value of the soil around the abnormal location; if the target situation information is abnormal, it is determined that there is a leakage in the buried pipeline to be tested and an alarm is issued; if the target situation information is normal, it returns to execute the acquisition module.

6. The buried pipeline leakage optical fiber composite detection device according to claim 5, characterized in that: The target situation information determination module includes: The mean value acquisition submodule is used to obtain the regional temperature mean values ​​of the buried pipeline to be tested in different detection areas, and the period temperature mean values ​​in different time periods; A threshold automatic acquisition submodule is used to obtain the regional alarm threshold of the abnormal positioning; The judgment submodule is used to judge whether the temperature difference between the temperature value and the temperature average of the time period exceeds the regional alarm threshold, or whether the temperature difference between the temperature value and the temperature average of the time period exceeds the regional alarm threshold of the abnormal location; if so, it is determined that there is a leakage in the buried pipeline to be tested; if not, it returns to the acquisition module.

7. The buried pipeline leakage optical fiber composite detection device according to claim 6, characterized in that: The target situation information determination module also includes: The threshold adjustment submodule is used to temporarily reduce the regional alarm threshold of the abnormal positioning.

8. The buried pipeline leakage optical fiber composite detection device according to claim 5, characterized in that: The initial situation information determination module includes: An input submodule, used for inputting an optical pulse signal into the optical fiber to be tested, generating Rayleigh scattering in the optical fiber laid along the buried pipeline to be tested, and obtaining a scattered signal image; A differential analysis submodule, used for converting the scattered signal image into a scattered signal waveform, and performing differential analysis on the scattered signal waveform to obtain corresponding signal features; The initial situation information determination submodule is used to determine the initial situation information of the buried pipeline to be tested based on the signal characteristics.

9. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the method according to any one of claims 1 to 4 is executed.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 4 is performed.

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