Pipeline leakage point detection method and system based on sound intensity focusing

Abstract

The invention relates to the technical field of pipeline leakage point detection, in particular to a pipeline leakage point detection method and system based on sound intensity focusing. According to the pipeline leakage point detection method based on sound intensity focusing, the sound signal acquisition and identification capability of the sound detection device can be improved; the phase of a sound signal is actively controlled through a linear array pickup, the sound signal is focused in a specific underground area (the position of a potential leakage point), and directional enhancement and interference suppression of the sound signal of the leakage point are realized; the focused sound signal of each potential leakage point is determined based on the real-time sound signal of each pickup and the sound signal time delay, and the focused sound signal can reflect the sound signal of each potential leakage point after delay correction, so that whether the potential leakage point is a leakage point or not is judged more accurately. Compared with a traditional single-point sound signal intensity judgment method, the scheme is higher in positioning precision, smaller in positioning error and higher in noise interference resistance by gathering the sound signals.

Description

Technical Field

[0001] This invention relates to the field of pipeline leak detection technology, specifically to a pipeline leak detection method and system based on sound intensity focusing. Background Technology

[0002] With the development of science and technology, the number of underground pipelines (such as water pipes) is increasing. When a large number of underground pipelines with complex layouts leak, it is necessary to locate the leak point in time to avoid water loss. At present, locating the leak point of buried pipelines is a difficult problem in the industry. Most existing water pipe leak detection methods use sound detection devices to detect leaks on the ground to find the leak point. This leak detection method relies on the sound detection device's ability to collect and recognize sound signals. Therefore, how to improve the sound detection device's ability to collect and recognize sound signals is an urgent problem to be solved. Summary of the Invention

[0003] The main objective of this invention is to provide a method and system for detecting pipe leaks based on sound intensity focusing, aiming to solve the problem of how to improve the ability of sound detection devices to collect and identify sound signals.

[0004] The technical solution proposed in this invention is as follows: A method for detecting pipe leaks based on sound intensity focusing is applied to a pipe leak detection system based on sound intensity focusing; the system includes microphones and a control host that are communicatively connected to each other; the number of microphones is multiple; the method includes: After determining the area to be tested, the microphone is placed on the ground of the area to be tested to form a linear array. The area to be tested is rectangular, and the leak point of the pipe to be tested is located underground in the area to be tested. The area to be tested includes a first edge and a second edge that are parallel and opposite to each other, as well as a third edge and a fourth edge that are parallel and opposite to each other. The inlet end of the pipe to be tested is located at the first edge, the inlet end of the pipe to be tested is located at the second edge, the line segment connecting the inlet end and the outlet end of the pipe to be tested coincides with the linear array, and the line segment where the linear array is located is perpendicular to the third edge. A three-dimensional coordinate system is constructed based on the area to be tested, and potential leakage points of the pipeline to be tested are set in the three-dimensional coordinate system; The control host calculates the audio signal delay of each microphone at potential leakage points, wherein each microphone is equally spaced in the linear array; The control host acquires the real-time sound signals collected by each microphone, and determines the focused sound signal of each potential leakage point based on the real-time sound signal and sound signal delay of each microphone. The control host determines the estimated leak location of the pipeline under test based on the focused sound signals of each potential leak point.

[0005] Preferably, the step of constructing a three-dimensional coordinate system based on the area to be tested and setting the potential leakage point of the pipe to be tested in the three-dimensional coordinate system includes: Establish x-axis and y-axis on the ground of the area to be measured, and establish z-axis in the vertical direction. The origin of z-axis is located on the ground of the area to be measured, and the intersection of x-axis and y-axis is the intersection of the first edge and the fourth edge. A three-dimensional coordinate system is constructed using the x-axis, y-axis, and z-axis, where the leak point of the pipeline under test is located in the three-dimensional coordinate system; Let the coordinates of the potential leak point in the pipeline under test be in the three-dimensional coordinate system. .

[0006] Preferably, the step of calculating the audio signal delay of each microphone at potential leakage points via the control host includes: Obtain the soil sound propagation speed in the area to be tested; For each potential leak point, based on the speed of sound propagation in the soil, the control host calculates the arrival time of the sound signal generated at each potential leak point. i The time of each pickup : , In the formula, Let be the coordinates of the i-th microphone in the linear array in the three-dimensional coordinate system, and satisfy . ; The speed at which sound travels through the soil in the area to be tested; The audio signal delay is determined by the control host. ,in, For reference time.

[0007] Preferably, the step of acquiring the real-time sound signals collected by each microphone through the control host, and determining the focused sound signal of each potential leakage point based on the real-time sound signals and sound signal delays of each microphone, includes: The control host acquires the real-time sound signal collected by the i-th microphone. ; The real-time sound signal collected by the i-th microphone is controlled by the control host. Applying audio signal delay To obtain the compensated sound signal corresponding to the i-th microphone. : ; The control host sums the compensated sound signals corresponding to all microphones to obtain the focusing signal strength of potential leakage points. : , In the formula, N is the total number of pickups in the linear array.

[0008] Preferably, the step of determining the estimated leak location of the pipeline under test based on the focused sound signals of each potential leak point by the control host includes: The control host iterates through the focused signal strength of all potential leakage points and obtains... The maximum value will be the largest The corresponding potential leak point is used as the estimated leak location point of the pipeline to be tested.

[0009] Preferred options also include: Select one microphone as the noise reference microphone and place it around the area to be tested; The control host acquires the real-time noise signal collected by the noise reference pickup. ; An adaptive filter is constructed using the control host, and a real-time noise signal is used. As the reference input, the focused sound signal As the desired input, the coefficients of the adaptive filter are adjusted in real time using the LMS algorithm. ; The control host outputs an interference sound signal based on an adaptive filter. ; The control host receives the aggregated signal. Subtracting interference sound signals In order to obtain a clean sound signal : ; The control host uses the sound intensity of the clean sound signal as the intensity of the focus signal.

[0010] Preferably, the step of determining the estimated leak location of the pipeline under test based on the focused sound signals of each potential leak point by the control host further includes: Four pickups were selected as the first reference pickup, the second reference pickup, the third reference pickup, and the fourth reference pickup, respectively. The first reference microphone and the second reference microphone are respectively set on both sides of the estimated leak location point along the x-axis direction. The horizontal distance between the first reference microphone and the estimated leak location point, and the horizontal distance between the second reference microphone and the estimated leak location point are both preset distance values. The third and fourth reference microphones are respectively set on both sides of the estimated leak location point along the y-axis. The horizontal distance between the third reference microphone and the estimated leak location point, and the horizontal distance between the fourth reference microphone and the estimated leak location point are both preset distance values. The control host acquires the real-time sound signal collected by the first reference pickup and marks it as the first target sound signal, the real-time sound signal collected by the second reference pickup and marks it as the second target sound signal, the real-time sound signal collected by the third reference pickup and marks it as the third target sound signal, and the real-time sound signal collected by the fourth reference pickup and marks it as the fourth target sound signal. The control host verifies the estimated leak location of the pipeline under test based on the first target sound signal, the second target sound signal, the third target sound signal, and the fourth target sound signal.

[0011] Preferably, the step of verifying the estimated leak location of the pipeline under test by the control host based on the first target sound signal, the second target sound signal, the third target sound signal, and the fourth target sound signal includes: The control host obtains the average sound intensity of the first target sound signal over a preset time period. The average sound intensity of the second target sound signal over a preset period of time. The average sound intensity of the third target sound signal over a preset period of time. And the average sound intensity of the fourth target sound signal over the past preset time period. ; The control host determines whether the following formula is satisfied: , , If so, the estimated leak location is determined and verified through the control host. If not, the control host determines that the estimated leak location point has not passed the verification, and re-executes the step of acquiring the real-time sound signals collected by each microphone through the control host, and determining the focused sound signal of each potential leak point based on the real-time sound signal and sound signal delay of each microphone.

[0012] This invention also proposes a pipeline leak detection system based on sound intensity focusing, which applies a pipeline leak detection method based on sound intensity focusing; the system includes microphones and a control host that are communicatively connected to each other; the number of microphones is multiple.

[0013] The above technical solution can achieve the following beneficial effects: The pipeline leak detection method based on sound intensity focusing proposed in this invention can improve the sound detection device's ability to collect and identify sound signals. By actively controlling the phase of the sound signal through a linear array microphone, the sound signal is focused on a specific underground area (the location of the potential leak point), achieving directional enhancement and interference suppression of the leak point sound signal. Based on the real-time sound signal and sound signal delay of each microphone, the focused sound signal of each potential leak point is determined. The focused sound signal can reflect the sound signal of each potential leak point after delay correction, thus more accurately determining whether a potential leak point is a leak point. Compared with the traditional single-point sound signal intensity judgment method, this scheme has higher positioning accuracy and smaller positioning error. By focusing the sound signal, it also has stronger anti-noise interference capability. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 This is a flowchart illustrating the steps of a first embodiment of a pipe leak detection method based on sound intensity focusing proposed in this invention. Figure 2 This is a schematic diagram of the test area and the microphone array in the first embodiment of the pipe leak detection method based on sound intensity focusing proposed in this invention. Detailed Implementation

[0016] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0017] This invention proposes a method and system for detecting pipeline leaks based on sound intensity focusing.

[0018] As attached Figure 1 and attached Figure 2 As shown, in the first embodiment of the pipe leak detection method based on sound intensity focusing proposed in this invention, this pipe leak detection method based on sound intensity focusing is applied to a pipe leak detection system based on sound intensity focusing; the system includes microphones (components for acquiring sound signals) and a control host that are communicatively connected to each other; the number of microphones is multiple; this embodiment includes the following steps: Step S110: After determining the area to be tested, place the microphone on the ground of the area to be tested to form a linear array. The area to be tested is rectangular, and the leak point of the pipe to be tested is located underground in the area to be tested. The area to be tested includes a first edge and a second edge that are parallel and opposite to each other, as well as a third edge and a fourth edge that are parallel and opposite to each other. The inlet end of the pipe to be tested is located at the first edge (and the inlet end of the pipe to be tested is located at the midpoint of the first edge). The inlet end of the pipe to be tested is located at the second edge (the inlet end of the pipe to be tested is located at the midpoint of the second edge). The line segment connecting the inlet end and the outlet end of the pipe to be tested coincides with the linear array, and the line segment where the linear array is located is perpendicular to the third edge.

[0019] Step S120: Construct a three-dimensional coordinate system based on the area to be tested, and set the potential leakage points of the pipeline to be tested in the three-dimensional coordinate system.

[0020] Specifically, a potential leak point can be any point in the three-dimensional coordinate system of the area to be tested. Therefore, it is necessary to traverse each potential leak point to determine the actual leak point.

[0021] Step S130: The control host calculates the audio signal delay of each microphone at potential leakage points, wherein each microphone is evenly distributed in the linear array.

[0022] Step S140: The control host acquires the real-time sound signals collected by each microphone, and determines the focused sound signal of each potential leakage point based on the real-time sound signal and sound signal delay of each microphone.

[0023] Specifically, the focused sound signal of each potential leakage point is determined based on the real-time sound signal and sound signal delay of each microphone. This focused sound signal can reflect the sound signal of each potential leakage point after delay correction, thereby more accurately determining whether a potential leakage point is a leakage point.

[0024] Step S150: The control host determines the estimated leak location of the pipeline under test based on the focused sound signals of each potential leak point.

[0025] The pipeline leak detection method based on sound intensity focusing proposed in this invention can improve the sound detection device's ability to collect and identify sound signals. By actively controlling the phase of the sound signal through a linear array microphone, the sound signal is focused on a specific underground area (the location of the potential leak point), achieving directional enhancement and interference suppression of the leak point sound signal. Based on the real-time sound signal and sound signal delay of each microphone, the focused sound signal of each potential leak point is determined. The focused sound signal can reflect the sound signal of each potential leak point after delay correction, thus more accurately determining whether a potential leak point is a leak point. Compared with the traditional single-point sound signal intensity judgment method, this scheme has higher positioning accuracy and smaller positioning error. By focusing the sound signal, it also has stronger anti-noise interference capability.

[0026] In the second embodiment of the pipe leak detection method based on sound intensity focusing proposed in this invention, based on the first embodiment, step S120 includes the following steps: Step S210: Establish x-axis and y-axis on the ground of the area to be measured, and establish z-axis in the vertical direction. The origin of z-axis is located on the ground of the area to be measured, and the intersection of x-axis and y-axis is the intersection of the first edge and the fourth edge.

[0027] Step S220: Construct a three-dimensional coordinate system with the x-axis, y-axis and z-axis, wherein the leak point of the pipeline under test is located in the three-dimensional coordinate system.

[0028] Step S230: Set the coordinates of the potential leak point of the pipeline under test in the three-dimensional coordinate system as follows: .

[0029] Specifically, this embodiment provides a technical solution for constructing a three-dimensional coordinate system and setting the coordinates of potential leak points in the pipeline under test within the three-dimensional coordinate system.

[0030] In the third embodiment of the pipe leak detection method based on sound intensity focusing proposed in this invention, based on the second embodiment, step S130 includes the following steps: Step S310: Obtain the soil sound propagation speed in the area to be tested.

[0031] Specifically, the speed of sound propagation in the soil needs to be calibrated on-site. For example, sand ≈ 320 m / s, clay ≈ 280 m / s.

[0032] Step S320: For each potential leak point, based on the soil sound propagation speed, the control host calculates the arrival time of the sound signal generated at each potential leak point. i The time of each pickup : , In the formula, Let be the coordinates of the i-th microphone in the linear array in the three-dimensional coordinate system, and satisfy . ; The speed at which sound travels through the soil in the area to be tested is denoted as .

[0033] Step S330: Determine the audio signal delay via the control host. ,in, For reference time.

[0034] Specifically, this embodiment provides a technical solution for calculating the audio signal delay of each microphone at potential leakage points.

[0035] In the fourth embodiment of the pipe leak detection method based on sound intensity focusing proposed in this invention, based on the third embodiment, step S140 includes the following steps: Step S410: Obtain the real-time sound signal collected by the i-th microphone through the control host. .

[0036] Step S420: The real-time sound signal acquired by the i-th microphone is processed by the control host. Applying audio signal delay To obtain the compensated sound signal corresponding to the i-th microphone. : .

[0037] Step S430: The control host sums the compensated sound signals corresponding to all microphones to obtain the focusing signal intensity of potential leakage points. : , In the formula, N is the total number of pickups in the linear array.

[0038] Specifically, this embodiment provides a specific scheme for determining the focused sound signal of each potential leakage point based on the real-time sound signal and sound signal delay of each microphone.

[0039] In the fifth embodiment of the pipe leak detection method based on sound intensity focusing proposed in this invention, based on the fourth embodiment, step S150 includes the following steps: Step S510: The control host iterates through the focused signal strength of all potential leakage points and obtains... The maximum value will be the largest The corresponding potential leak point is used as the estimated leak location point of the pipeline to be tested.

[0040] Specifically, the focused signal strength at the potential leak points here. This reflects the sound intensity of the sound signal emitted from a potential leak point, as it converges on various microphones. The actual leak point will have the highest sound intensity. Therefore, it is necessary to iterate through each potential leak point (i.e., sequentially...) By assigning different values ​​to the focusing signal intensity, the potential leak point corresponding to the largest focusing signal intensity can be used as the estimated leak location of the pipeline under test.

[0041] In the sixth embodiment of the pipe leak detection method based on sound intensity focusing proposed in this invention, based on the fifth embodiment, this embodiment further includes the following steps: Step S610: Select one microphone as a noise reference microphone and set it around the area to be tested.

[0042] Step S620: Obtain the real-time noise signal collected by the noise reference pickup through the control host. .

[0043] Step S630: Construct an adaptive filter using the control host and apply it to the real-time noise signal. As the reference input, the focused sound signal As the desired input, the coefficients of the adaptive filter are adjusted in real time using the LMS algorithm. .

[0044] Step S640: The control host outputs an interference sound signal based on an adaptive filter. .

[0045] Step S650: The control host collects the signal signal. Subtracting interference sound signals In order to obtain a clean sound signal : .

[0046] Step S660: The sound intensity of the clean sound signal is used as the focus signal intensity by the control host.

[0047] Specifically, by constructing an adaptive filter, the external noise collected by the noise reference pickup is filtered to obtain the final focused signal strength, thereby further reducing the interference of external noise.

[0048] In the seventh embodiment of the pipe leak detection method based on sound intensity focusing proposed in this invention, based on the first embodiment, step S150 is followed by the following steps: Step S710: Select four microphones as the first reference microphone, the second reference microphone, the third reference microphone, and the fourth reference microphone, respectively.

[0049] Step S720: The first reference microphone and the second reference microphone are respectively set on both sides of the estimated leak location point along the x-axis direction, wherein the horizontal distance between the first reference microphone and the estimated leak location point, and the horizontal distance between the second reference microphone and the estimated leak location point are both preset distance values.

[0050] Step S730: Set the third reference microphone and the fourth reference microphone on both sides of the estimated leak location point along the y-axis, respectively. The horizontal distance between the third reference microphone and the estimated leak location point, and the horizontal distance between the fourth reference microphone and the estimated leak location point are both preset distance values ​​(e.g., 1 meter).

[0051] Specifically, a first reference microphone, a second reference microphone, a third reference microphone, and a fourth reference microphone are set up and placed around the estimated leak location. The sound signals collected by these four reference microphones are then used to verify the accuracy of the estimated leak location.

[0052] Step S740: The real-time sound signal acquired by the first reference pickup is acquired through the control host and marked as the first target sound signal, the real-time sound signal acquired by the second reference pickup is marked as the second target sound signal, the real-time sound signal acquired by the third reference pickup is marked as the third target sound signal, and the real-time sound signal acquired by the fourth reference pickup is marked as the fourth target sound signal.

[0053] Step S750: The control host verifies the estimated leak location of the pipeline under test based on the first target sound signal, the second target sound signal, the third target sound signal, and the fourth target sound signal.

[0054] In the eighth embodiment of the pipe leak detection method based on sound intensity focusing proposed in this invention, based on the first embodiment, step S750 includes the following steps: Step S810: Obtain the average sound intensity of the first target sound signal over a preset time period (e.g., 10 seconds) via the control host. The average sound intensity of the second target sound signal over a preset period of time. The average sound intensity of the third target sound signal over a preset period of time. And the average sound intensity of the fourth target sound signal over the past preset time period. .

[0055] Step S820: The control host determines whether the following formula is satisfied: , , If so, proceed to step S830: verify the estimated leak location point determined by the control host.

[0056] Specifically, if the above formula is satisfied, it proves that the intensity of the sound signals received by the first reference microphone, the second reference microphone, the third reference microphone, and the fourth reference microphone is not much different. Therefore, the current estimated leakage location is likely to be the actual leakage location, and the estimated leakage location is verified.

[0057] If not, proceed to step S840: determine through the control host that the estimated leak location point has not passed verification, and re-execute step S140 and subsequent steps.

[0058] Conversely, if the above formula is not satisfied, it proves that the intensity of the sound signals received by the first reference microphone, the second reference microphone, the third reference microphone, and the fourth reference microphone is significantly different. Therefore, the current estimated leak location is not accurate, the estimated leak location has not passed the verification, and step S140 and subsequent steps need to be executed again to determine the estimated leak location of the pipe under test.

[0059] This invention also proposes a pipeline leak detection system based on sound intensity focusing, which applies a pipeline leak detection method based on sound intensity focusing; the system includes microphones and a control host that are communicatively connected to each other; the number of microphones is multiple.

[0060] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0061] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A method for detecting pipe leaks based on sound intensity focusing, characterized in that, An application to a pipe leak detection system based on sound intensity focusing; the system includes microphones and a control host that are communicatively connected to each other; The number of pickups is multiple; the method includes: After determining the area to be tested, the microphone is placed on the ground of the area to be tested to form a linear array. The area to be tested is rectangular, and the leak point of the pipe to be tested is located underground in the area to be tested. The area to be tested includes a first edge and a second edge that are parallel and opposite to each other, as well as a third edge and a fourth edge that are parallel and opposite to each other. The inlet end of the pipe to be tested is located at the first edge, the inlet end of the pipe to be tested is located at the second edge, the line segment connecting the inlet end and the outlet end of the pipe to be tested coincides with the linear array, and the line segment where the linear array is located is perpendicular to the third edge. A three-dimensional coordinate system is constructed based on the area to be tested, and potential leakage points of the pipeline to be tested are set in the three-dimensional coordinate system; The control host calculates the audio signal delay of each microphone at potential leakage points, wherein each microphone is equally spaced in the linear array; The control host acquires the real-time sound signals collected by each microphone, and determines the focused sound signal of each potential leakage point based on the real-time sound signal and sound signal delay of each microphone. The control host determines the estimated leak location of the pipeline under test based on the focused sound signals of each potential leak point.

2. The pipeline leak detection method based on sound intensity focusing according to claim 1, characterized in that, The construction of a three-dimensional coordinate system based on the area to be tested, and the setting of potential leak points of the pipeline to be tested in the three-dimensional coordinate system, includes: Establish x-axis and y-axis on the ground of the area to be measured, and establish z-axis in the vertical direction. The origin of z-axis is located on the ground of the area to be measured, and the intersection of x-axis and y-axis is the intersection of the first edge and the fourth edge. A three-dimensional coordinate system is constructed using the x-axis, y-axis, and z-axis, where the leak point of the pipeline under test is located in the three-dimensional coordinate system; Let the coordinates of the potential leak point in the pipeline under test be in the three-dimensional coordinate system. .

3. The pipeline leak detection method based on sound intensity focusing according to claim 2, characterized in that, The calculation of the audio signal delay of each microphone at potential leakage points via the control host includes: Obtain the soil sound propagation speed in the area to be tested; For each potential leak point, based on the speed of sound propagation in the soil, the control host calculates the arrival time of the sound signal generated at each potential leak point. i The time of each pickup : ， In the formula, Let be the coordinates of the i-th microphone in the linear array in the three-dimensional coordinate system, and satisfy . ; The speed at which sound travels through the soil in the area to be tested; The audio signal delay is determined by the control host. ,in, For reference time.

4. The pipeline leak detection method based on sound intensity focusing according to claim 3, characterized in that, The process of acquiring real-time sound signals collected by each microphone through the control host, and determining the focused sound signal of each potential leakage point based on the real-time sound signal and sound signal delay of each microphone, includes: The control host acquires the real-time sound signal collected by the i-th microphone. ; The real-time sound signal collected by the i-th microphone is controlled by the control host. Applying audio signal delay To obtain the compensated sound signal corresponding to the i-th microphone. : ； The control host sums the compensated sound signals corresponding to all microphones to obtain the focusing signal strength of potential leakage points. : , In the formula, N is the total number of pickups in the linear array.

5. The pipeline leak detection method based on sound intensity focusing according to claim 4, characterized in that, The step of determining the estimated leak location of the pipeline under test by the control host based on the focused sound signals of each potential leak point includes: The control host iterates through the focused signal strength of all potential leakage points and obtains... The maximum value will be the largest The corresponding potential leak point is used as the estimated leak location point of the pipeline to be tested.

6. The pipeline leak detection method based on sound intensity focusing according to claim 5, characterized in that, Also includes: Select one microphone as the noise reference microphone and place it around the area to be tested; The control host acquires the real-time noise signal collected by the noise reference pickup. ; An adaptive filter is constructed using the control host, and a real-time noise signal is used. As the reference input, the focused sound signal As the desired input, the coefficients of the adaptive filter are adjusted in real time using the LMS algorithm. ; The control host outputs an interference sound signal based on an adaptive filter. ; The control host receives the aggregated signal. Subtracting interference sound signals In order to obtain a clean sound signal : ； The control host uses the sound intensity of the clean sound signal as the intensity of the focus signal.

7. The pipeline leak detection method based on sound intensity focusing according to claim 1, characterized in that, The process of determining the estimated leak location of the pipeline under test based on the focused sound signals of each potential leak point using the control host further includes: Four pickups were selected as the first reference pickup, the second reference pickup, the third reference pickup, and the fourth reference pickup, respectively. The first reference microphone and the second reference microphone are respectively set on both sides of the estimated leak location point along the x-axis direction. The horizontal distance between the first reference microphone and the estimated leak location point, and the horizontal distance between the second reference microphone and the estimated leak location point are both preset distance values. The third and fourth reference microphones are respectively set on both sides of the estimated leak location point along the y-axis. The horizontal distance between the third reference microphone and the estimated leak location point, and the horizontal distance between the fourth reference microphone and the estimated leak location point are both preset distance values. The control host acquires the real-time sound signal collected by the first reference pickup and marks it as the first target sound signal, the real-time sound signal collected by the second reference pickup and marks it as the second target sound signal, the real-time sound signal collected by the third reference pickup and marks it as the third target sound signal, and the real-time sound signal collected by the fourth reference pickup and marks it as the fourth target sound signal. The control host verifies the estimated leak location of the pipeline under test based on the first target sound signal, the second target sound signal, the third target sound signal, and the fourth target sound signal.

8. The pipeline leak detection method based on sound intensity focusing according to claim 1, characterized in that, The verification of the estimated leak location of the pipeline under test by the control host based on the first target sound signal, the second target sound signal, the third target sound signal, and the fourth target sound signal includes: The control host obtains the average sound intensity of the first target sound signal over a preset time period. The average sound intensity of the second target sound signal over a preset period of time. The average sound intensity of the third target sound signal over a preset period of time. And the average sound intensity of the fourth target sound signal over the past preset time period. ; The control host determines whether the following formula is satisfied: ， ， If so, the estimated leak location is verified by the control host. If not, the control host determines that the estimated leak location point has not passed the verification, and re-executes the step of acquiring the real-time sound signals collected by each microphone through the control host, and determining the focused sound signal of each potential leak point based on the real-time sound signal and sound signal delay of each microphone.

9. A pipeline leak detection system based on sound intensity focusing, characterized in that, The method for detecting pipe leaks based on sound intensity focusing, as described in any one of claims 1-8, is applied; the system includes microphones and a control host that are communicatively connected to each other; the number of microphones is multiple.

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