Pipeline leakage point detection method and system based on thermal imaging

Abstract

The invention relates to the technical field of pipeline detection, in particular to a pipeline leakage point detection method and system based on thermal imaging. According to the pipeline leakage point detection method based on thermal imaging, the problems that an existing pipeline leakage point detection mode is rough, is prone to being interfered by external noise and is low in precision can be solved; according to the method, the first water pump and the second water pump are controlled to be started, the heating module is controlled to be started, and after the first water pump is started for a preset time, the ground temperature corresponding to the to-be-detected pipeline rises, so that the trend of the to-be-detected pipeline can be identified by scanning the ground of the to-be-detected area through the infrared thermal imager; the temperature of the earth surface position point corresponding to the leakage point is higher, so that the highest-temperature position point in the high-temperature position curve section is directly used as the leakage position point of the to-be-detected pipeline; according to the detection method provided by the invention, the leakage point of the pipeline can be more accurately detected.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline detection, and in particular to a pipeline leakage detection method and system based on thermal imaging. Background Art

[0002] With the acceleration of urbanization, the number of underground pipelines (such as underground water pipes) is also increasing. A large number of underground water pipes with complex routes need to locate the leaks in time to avoid water leakage losses. Currently, locating the leaks of buried pipes is a difficult problem in the industry and there is no universal solution.

[0003] The existing water pipe leakage detection scheme mostly requires operators to use handheld sonic detectors to detect on the ground to determine the leakage location; however, this leakage detection method is relatively rough and easily interfered by external noise, resulting in reduced accuracy of leakage detection. Summary of the invention

[0004] The main purpose of the present invention is to provide a pipeline leak detection method and system based on thermal imaging, aiming to solve the problem that the existing pipeline leak detection method is relatively rough, easily disturbed by external noise and has low accuracy.

[0005] The technical solution proposed by the present invention is:

[0006] A pipeline leakage detection method based on thermal imaging is applied to a pipeline leakage detection system based on thermal imaging; the system comprises a host, a hot water circulation component and an infrared thermal imager; the hot water circulation component comprises a first water pump, a second water pump, a water storage tank and a heating module; the water inlet end of the first water pump is connected to the water storage tank; the water outlet end of the first water pump is connected to the water inlet end of the pipeline to be tested; the water inlet end of the second water pump is connected to the water outlet end of the pipeline to be tested; the water outlet end of the second water pump is connected to the water storage tank; the heating module is arranged in the water storage tank; the infrared thermal imager is communicatively connected to the host; the first water pump and the second water pump are both electrically connected to the host; the method comprises:

[0007] The host simultaneously controls the first water pump and the second water pump to start;

[0008] The host controls the heating module to start;

[0009] After the first water pump is started for a preset time, the infrared thermal imager is used to search along the area to be tested, and the high-temperature position curve segment representing the direction of the pipeline to be tested is determined by the host, wherein the area to be tested is the area between the water inlet end and the water outlet end of the pipeline to be tested;

[0010] The host uses the highest temperature position point in the high temperature position curve segment as the leakage position point of the pipeline to be tested.

[0011] Preferably, after the first water pump is started for a preset time, the infrared thermal imager is used to search along the area to be tested, and the high-temperature position curve segment representing the direction of the pipeline to be tested is determined by the host, including:

[0012] Searching the area to be tested with an infrared thermal imager to determine a location point in the area to be tested where the surface temperature is greater than a preset temperature value, and marking it as a first target location point;

[0013] The infrared thermal imager sends the position information of all first target position points to the host;

[0014] The host marks the first target position point closest to the water inlet end of the pipeline to be tested as the starting position point, and marks the first target position point closest to the water outlet end of the pipeline to be tested as the ending position point;

[0015] The host sequentially connects the first target position point between the starting position point and the ending position point as close as possible, thereby forming a high-temperature position curve segment.

[0016] Preferably, the host sequentially connects the first target position point between the starting position point and the ending position point to form a high temperature position curve segment, including:

[0017] The host obtains the total number of first target location points;

[0018] The host sets i=1;

[0019] The host marks the position number of the starting position point as 1, and marks the position number of the ending position point as M, where M is the total number of the first target position points;

[0020] The host marks the position number of the first target position point closest to the first target position point with position number i as i+1;

[0021] The host determines whether i+1=M-1 is established;

[0022] If yes, the host connects the first target position points in order from small to large position numbers to obtain a high temperature position curve segment;

[0023] If not, the host sets i=i+1, and executes the host to mark the position number of the first target position point closest to the first target position point with position number i as i+1.

[0024] Preferably, after the first water pump is started for a preset time, the infrared thermal imager is used to search along the area to be tested, and the high-temperature position curve segment representing the direction of the pipeline to be tested is determined by the host, and then the method further includes:

[0025] The host obtains a first target position point with the highest temperature in the high-temperature position curve segment, and marks it as a first position point to be verified;

[0026] The host marks a preset number of first target position points closest to the first position point to be verified as surrounding position points;

[0027] The host determines whether a first condition is satisfied; wherein the first condition is that the temperature values ​​of the surrounding points are all lower than the temperature value of the first point to be verified;

[0028] If so, the host uses the first position point to be verified as the leakage position point of the pipeline to be tested.

[0029] Preferably, the host marks a preset number of first target position points closest to the first position point to be verified as surrounding position points, and then further includes:

[0030] The host determines whether the second condition is satisfied; wherein the second condition is: the temperature value of the surrounding position point closer to the first position point to be verified is higher;

[0031] If so, the host uses the first position point to be verified as the leakage position point of the pipeline to be tested.

[0032] Preferably, the system further comprises a pickup connected to the host in communication; the method further comprises:

[0033] The host divides the area to be tested into a plurality of sub-areas to be tested in the direction of the connection between the water inlet end and the water outlet end of the pipe to be tested according to a preset division rule;

[0034] The host obtains the intensity of the sound signal collected by the microphone at each position point in each sub-area to be tested, wherein the sound signal is generated by the vibration of the pipeline to be tested;

[0035] The host obtains the position point with the maximum sound signal strength in the sub-area to be tested, and marks it as the second target position point;

[0036] The host uses the second target position point with the maximum sound signal intensity as the leakage position point of the pipeline to be tested.

[0037] Preferably, the host obtains a position point with the maximum sound signal strength in the sub-area to be tested, and marks it as a second target position point, and then further includes:

[0038] The host marks the second target position point with the largest sound signal strength as the second position point to be verified;

[0039] The host obtains the first target position point with the highest temperature in the high temperature position curve segment and marks it as the first position point to be verified, and then further includes:

[0040] The host obtains a preset distance value;

[0041] The host determines whether the following condition is met: the distance between the first position point to be verified and the second position point to be verified is less than the preset distance value;

[0042] If yes, the host uses the midpoint between the first position point to be verified and the second position point to be verified as the leakage position point of the pipeline to be tested.

[0043] Preferably, the host obtains the preset distance value, including:

[0044] The host obtains the distance between the water inlet and the water outlet of the pipeline to be tested, and marks it as the pipeline spacing;

[0045] The host determines the preset distance value based on the pipeline spacing, wherein the larger the pipeline spacing is, the larger the preset distance value is, and the smaller the pipeline spacing is, the smaller the preset distance value is.

[0046] Preferably, the system further comprises a monitoring headset connected to the host for communication; the host obtains the intensity of the sound signal collected by the pickup at each position point in each sub-area to be tested, and then further comprises:

[0047] The host sends the sound signal collected by the microphone to the monitoring earphone, and plays it through the monitoring earphone.

[0048] The present invention also proposes a pipeline leakage detection system based on thermal imaging, which applies a pipeline leakage detection method based on thermal imaging; the system includes a main unit, a hot water circulation component and an infrared thermal imager; the hot water circulation component includes a first water pump, a second water pump, a water storage tank and a heating module; the water inlet end of the first water pump is connected to the water storage tank; the water outlet end of the first water pump is connected to the water inlet end of the pipeline to be tested; the water inlet end of the second water pump is connected to the water outlet end of the pipeline to be tested; the water outlet end of the second water pump is connected to the water storage tank; the heating module is arranged in the water storage tank; the infrared thermal imager is communicatively connected to the main unit; the first water pump and the second water pump are both electrically connected to the main unit.

[0049] Through the above technical solution, the following beneficial effects can be achieved:

[0050] The pipeline leakage point detection method based on thermal imaging proposed in the present invention can solve the problems that the existing pipeline leakage point detection method is relatively rough, easily interfered by external noise and has low accuracy; the method first controls the first water pump and the second water pump to start, and controls the heating module to start, and then when the first water pump is started for a preset time, the ground temperature corresponding to the pipeline to be tested will rise, so by scanning the ground of the area to be tested with an infrared thermal imager, the direction of the pipeline to be tested can be identified, and because hot water will gather at the pipeline leakage point, causing hot air to gather and rise, the temperature of the surface position point corresponding to the leakage point will be higher, so the highest temperature position point in the high-temperature position curve segment is directly used as the leakage position point of the pipeline to be tested; the detection method proposed in the present invention can detect the leakage point of the pipeline more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] 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 the structures shown in these drawings without paying creative work.

[0052] Figure 1 This is a flowchart of a first embodiment of a pipeline leak detection method based on thermal imaging proposed by the present invention. DETAILED DESCRIPTION

[0053] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0054] The present invention provides a pipeline leakage detection method and system based on thermal imaging.

[0055] As attached Figure 1 As shown, in a first embodiment of a pipeline leakage detection method based on thermal imaging proposed by the present invention, the method is applied to a pipeline leakage detection system based on thermal imaging; the system includes a host, a hot water circulation component and an infrared thermal imager; the hot water circulation component includes a first water pump, a second water pump, a water tank and a heating module (such as a resistance heating wire, used to heat the water in the water tank); the water inlet end of the first water pump is connected to the water tank; the water outlet end of the first water pump is connected to the water inlet end of the pipeline to be tested; the water inlet end of the second water pump is connected to the water outlet end of the pipeline to be tested; the water outlet end of the second water pump is connected to the water tank; the heating module is arranged in the water tank; the infrared thermal imager is communicatively connected to the host; the first water pump and the second water pump are both electrically connected to the host; this embodiment includes the following steps:

[0056] Step S110: the host controls the first water pump and the second water pump to start simultaneously.

[0057] Step S120: the host controls the heating module to start.

[0058] Specifically, through the above two steps, the water in the water tank can be heated, and the hot water can be circulated in the pipe to be tested, so that positioning can be performed subsequently by an infrared thermal imager.

[0059] Step S130: After the first water pump is started for a preset time (for example, 5 minutes), the infrared thermal imager searches along the area to be tested, and the host determines the high-temperature position curve segment representing the direction of the pipeline to be tested, wherein the area to be tested is the area between the water inlet end and the water outlet end of the pipeline to be tested.

[0060] Specifically, since hot water circulates in the pipeline to be tested, the pipeline to be tested will heat the underground area and the corresponding ground; therefore, by scanning the ground of the area to be tested with an infrared thermal imager, the direction of the pipeline to be tested can be identified.

[0061] Step S140: the host uses the highest temperature position point in the high temperature position curve segment as the leakage position point of the pipeline to be tested.

[0062] The pipeline leakage point detection method based on thermal imaging proposed in the present invention can solve the problems that the existing pipeline leakage point detection method is relatively rough, easily interfered by external noise and has low accuracy; the method first controls the first water pump and the second water pump to start, and controls the heating module to start, and then when the first water pump is started for a preset time, the ground temperature corresponding to the pipeline to be tested will rise, so by scanning the ground of the area to be tested with an infrared thermal imager, the direction of the pipeline to be tested can be identified, and because hot water will gather at the pipeline leakage point, causing hot air to gather and rise, the temperature of the surface position point corresponding to the leakage point will be higher, so the highest temperature position point in the high-temperature position curve segment is directly used as the leakage position point of the pipeline to be tested; the detection method proposed in the present invention can detect the leakage point of the pipeline more accurately.

[0063] In a second embodiment of a pipeline leak detection method based on thermal imaging proposed by the present invention, based on the first embodiment, step S130 includes the following steps:

[0064] Step S210: Use the infrared thermal imager to search along the area to be tested to determine a location point in the area to be tested where the surface temperature is greater than a preset temperature value (eg, 30 degrees Celsius), and mark it as a first target location point.

[0065] Step S220: The infrared thermal imager sends the position information of all first target position points to the host.

[0066] Step S230: the host marks the first target position point closest to the water inlet end of the pipeline to be tested as the starting position point, and marks the first target position point closest to the water outlet end of the pipeline to be tested as the ending position point.

[0067] Step S240: the host sequentially connects the first target position point between the starting position point and the ending position point as close as possible, thereby forming a high temperature position curve segment.

[0068] In a third embodiment of a pipeline leak detection method based on thermal imaging proposed by the present invention, based on the second embodiment, step S240 includes the following steps:

[0069] Step S310: the host obtains the total number of first target location points.

[0070] Step S320: The host sets i=1.

[0071] Step S330: The host marks the position number of the starting position point as 1, and marks the position number of the ending position point as M, where M is the total number of the first target position points.

[0072] Step S340: the host marks the position number of the first target position point closest to the first target position point with position number i as i+1.

[0073] Step S350: The host determines whether i+1=M-1 holds.

[0074] If so, execute step S360: the host connects the first target position points in order from small to large position numbers to obtain a high temperature position curve segment.

[0075] If not, execute step S370: the host sets i=i+1, and executes the host to mark the position number of the first target position point closest to the first target position point with position number i as i+1.

[0076] This embodiment provides a specific solution for determining the high-temperature position curve segment representing the direction of the pipeline to be tested.

[0077] In a fourth embodiment of a pipeline leak detection method based on thermal imaging proposed by the present invention, based on the third embodiment, step S130 further includes the following steps:

[0078] Step S410: the host obtains the first target position point with the highest temperature in the high-temperature position curve segment, and marks it as the first position point to be verified.

[0079] Step S420: The host marks a preset number (eg, 4) of first target location points closest to the first location point to be verified as surrounding location points.

[0080] Step S430: The host determines whether a first condition is satisfied; wherein the first condition is that the temperature values ​​of the surrounding points are all lower than the temperature value of the first point to be verified.

[0081] If yes, execute step S440: the host uses the first position point to be verified as the leakage position point of the pipeline to be tested.

[0082] Specifically, if the temperatures of the four first target positions around the first position to be verified are all lower than the temperature of the first position to be verified, it can be determined that the first position to be verified is the leakage position of the pipeline to be tested.

[0083] In a fifth embodiment of a pipeline leak detection method based on thermal imaging proposed by the present invention, based on the fourth embodiment, step S420 further includes the following steps:

[0084] Step S50: The host determines whether the second condition is satisfied; wherein the second condition is that the temperature value of the surrounding position points closer to the first position point to be verified is higher.

[0085] If yes, execute step S520: the host uses the first position point to be verified as the leakage position point of the pipeline to be tested.

[0086] Specifically, if the first position point to be verified corresponds to the leakage point of the pipeline to be tested, the closer the corresponding surrounding position points are to the first position point to be verified, the higher the temperature values ​​of the surrounding position points are; that is, the second condition is met.

[0087] In a sixth embodiment of a pipeline leak detection method based on thermal imaging proposed by the present invention, based on the fifth embodiment, the system further includes a pickup connected to the host for communication; this embodiment further includes the following steps:

[0088] Step S610: the host divides the area to be tested into a plurality of sub-areas to be tested in the direction of the connection line between the water inlet and the water outlet of the pipe to be tested according to a preset division rule.

[0089] The preferred rule for sub-area division in this embodiment is: first determine the area to be tested (the area to be tested is a rectangle, and the water inlet and outlet of the pipe to be tested are respectively located on two opposite edges of the area to be tested), and divide the area to be tested into 10 sub-areas to be tested of equal area (the more sub-areas to be tested, the more accurate the positioning result).

[0090] Step S620: the host obtains the intensity of the sound signal collected by the microphone at each position point in each sub-area to be tested, wherein the sound signal is generated by the vibration of the pipeline to be tested.

[0091] Step S630: The host obtains a position point with the maximum sound signal strength in the sub-area to be tested, and marks it as a second target position point.

[0092] Step S640: The host uses the second target position point with the largest sound signal intensity as the leakage position point of the pipeline to be tested.

[0093] Specifically, when water circulates in the pipeline, the pipeline to be tested will vibrate, thereby emitting a sound signal, and the intensity value of the sound signal detected on the ground corresponding to the leakage point of the pipeline to be tested is the largest.

[0094] In a seventh embodiment of a pipeline leak detection method based on thermal imaging proposed by the present invention, based on the sixth embodiment, step S630 further includes the following steps:

[0095] Step S710: The host marks the second target position point with the largest sound signal strength as the second position point to be verified.

[0096] Step S410 further includes the following steps:

[0097] Step S720: The host obtains a preset distance value.

[0098] Step S730: The host determines whether the following condition is met: the distance between the first position point to be verified and the second position point to be verified is less than the preset distance value.

[0099] If yes, execute step S740: the host uses the midpoint between the first position point to be verified and the second position point to be verified as the leakage position point of the pipeline to be tested.

[0100] Specifically, this embodiment collects sound signals through a microphone and determines the leakage point of the pipeline to be tested based on the sound signals. Under normal circumstances, the distance between the first position point to be verified and the second position point to be verified should be small (or the first position point to be verified and the second position point to be verified coincide with each other).

[0101] In an eighth embodiment of a pipeline leak detection method based on thermal imaging proposed by the present invention, based on the seventh embodiment, step S720 includes the following steps:

[0102] Step S810: The host obtains the distance between the water inlet and the water outlet of the pipeline to be tested, and marks it as the pipeline spacing.

[0103] Step S820: The host determines the preset distance value based on the pipeline spacing, wherein the larger the pipeline spacing is, the larger the preset distance value is, and the smaller the pipeline spacing is, the smaller the preset distance value is.

[0104] The host determines the preset distance value based on the pipeline spacing by a calculation formula as follows:

[0105] J Y =J G ×A,

[0106] In the formula, J Y is the preset distance value; J G is the pipeline spacing; A is a proportionality coefficient, which has a value greater than 0 and less than 1 (for example, 0.01).

[0107] Specifically, when the pipeline spacing is larger, it means that the area to be tested is larger, and accordingly the spacing tolerance value between the first position point to be verified and the second position point to be verified is larger; this embodiment obtains the preset distance value based on this calculation.

[0108] In a ninth embodiment of a pipeline leak detection method based on thermal imaging proposed by the present invention, based on the sixth embodiment, the system further includes a monitoring headset connected to the host for communication; step S620, and then further includes the following steps:

[0109] Step S910: the host sends the sound signal collected by the microphone to the monitoring earphone, and plays the sound signal through the monitoring earphone.

[0110] Specifically, the operator monitors the sound signal collected by the microphone in real time through monitoring headphones, which makes it easier for the operator to improve the accuracy of the detection.

[0111] The present invention also proposes a pipeline leakage detection system based on thermal imaging, which applies a pipeline leakage detection method based on thermal imaging; the system includes a main unit, a hot water circulation component and an infrared thermal imager; the hot water circulation component includes a first water pump, a second water pump, a water storage tank and a heating module; the water inlet end of the first water pump is connected to the water storage tank; the water outlet end of the first water pump is connected to the water inlet end of the pipeline to be tested; the water inlet end of the second water pump is connected to the water outlet end of the pipeline to be tested; the water outlet end of the second water pump is connected to the water storage tank; the heating module is arranged in the water storage tank; the infrared thermal imager is communicatively connected to the main unit; the first water pump and the second water pump are both electrically connected to the main unit.

[0112] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0113] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A pipeline leak detection method based on thermal imaging, characterized in that: Applicable to a pipeline leak detection system based on thermal imaging; the system comprises a host, a hot water circulation component and an infrared thermal imager; the hot water circulation component comprises a first water pump, a second water pump, a water storage tank and a heating module; the water inlet end of the first water pump is connected to the water storage tank; the water outlet end of the first water pump is connected to the water inlet end of the pipeline to be tested; the water inlet end of the second water pump is connected to the water outlet end of the pipeline to be tested; the water outlet end of the second water pump is connected to the water storage tank; the heating module is arranged in the water storage tank; The infrared thermal imager is communicatively connected to the host; The first water pump and the second water pump are both electrically connected to the host; the method comprises: The host simultaneously controls the first water pump and the second water pump to start; The host controls the heating module to start; After the first water pump is started for a preset time, the infrared thermal imager is used to search along the area to be tested, and the high-temperature position curve segment representing the direction of the pipeline to be tested is determined by the host, wherein the area to be tested is the area between the water inlet end and the water outlet end of the pipeline to be tested; The host uses the highest temperature position point in the high temperature position curve segment as the leakage position point of the pipeline to be tested.

2. A pipeline leak detection method based on thermal imaging according to claim 1, characterized in that: After the first water pump is started for a preset time, the infrared thermal imager is used to search along the area to be tested, and the high-temperature position curve segment representing the direction of the pipeline to be tested is determined by the host, including: Searching the area to be tested with an infrared thermal imager to determine a location point in the area to be tested where the surface temperature is greater than a preset temperature value, and marking it as a first target location point; The infrared thermal imager sends the position information of all first target position points to the host; The host marks the first target position point closest to the water inlet end of the pipeline to be tested as the starting position point, and marks the first target position point closest to the water outlet end of the pipeline to be tested as the ending position point; The host sequentially connects the first target position point between the starting position point and the ending position point as close as possible, thereby forming a high-temperature position curve segment.

3. A pipeline leak detection method based on thermal imaging according to claim 2, characterized in that: The host sequentially connects the first target position point between the starting position point and the ending position point to form a high temperature position curve segment, including: The host obtains the total number of first target location points; The host sets i=1; The host marks the position number of the starting position point as 1, and marks the position number of the ending position point as M, where M is the total number of the first target position points; The host marks the position number of the first target position point closest to the first target position point with position number i as i+1; The host determines whether i+1=M-1 is established; If yes, the host connects the first target position points in order from small to large position numbers to obtain a high temperature position curve segment; If not, the host sets i=i+1, and executes the host to mark the position number of the first target position point closest to the first target position point with position number i as i+1.

4. The pipeline leak detection method based on thermal imaging according to claim 3 is characterized in that: After the first water pump is started for a preset time, the infrared thermal imager is used to search along the area to be tested, and the high-temperature position curve segment representing the direction of the pipeline to be tested is determined by the host, and then the following steps are further included: The host obtains a first target position point with the highest temperature in the high-temperature position curve segment, and marks it as a first position point to be verified; The host marks a preset number of first target position points closest to the first position point to be verified as surrounding position points; The host determines whether a first condition is satisfied; wherein the first condition is that the temperature values ​​of the surrounding points are all lower than the temperature value of the first point to be verified; If so, the host uses the first position point to be verified as the leakage position point of the pipeline to be tested.

5. The pipeline leak detection method based on thermal imaging according to claim 4 is characterized in that: The host marks a preset number of first target position points closest to the first position point to be verified as surrounding position points, and then further includes: The host determines whether the second condition is satisfied; wherein the second condition is: the temperature value of the surrounding position point closer to the first position point to be verified is higher; If so, the host uses the first position point to be verified as the leakage position point of the pipeline to be tested.

6. The pipeline leak detection method based on thermal imaging according to claim 5 is characterized in that: The system further includes a pickup connected to the host in communication; the method further includes: The host divides the area to be tested into a plurality of sub-areas to be tested in the direction of the connection between the water inlet end and the water outlet end of the pipe to be tested according to a preset division rule; The host obtains the intensity of the sound signal collected by the microphone at each position point in each sub-area to be tested, wherein the sound signal is generated by the vibration of the pipeline to be tested; The host obtains the position point with the maximum sound signal strength in the sub-area to be tested, and marks it as the second target position point; The host uses the second target position point with the maximum sound signal intensity as the leakage position point of the pipeline to be tested.

7. The pipeline leak detection method based on thermal imaging according to claim 6 is characterized in that: The host obtains the position point with the maximum sound signal strength in the sub-area to be tested and marks it as the second target position point, and then further includes: The host marks the second target position point with the largest sound signal strength as the second position point to be verified; The host obtains the first target position point with the highest temperature in the high temperature position curve segment and marks it as the first position point to be verified, and then further includes: The host obtains a preset distance value; The host determines whether the following condition is met: the distance between the first position point to be verified and the second position point to be verified is less than the preset distance value; If yes, the host uses the midpoint between the first position point to be verified and the second position point to be verified as the leakage position point of the pipeline to be tested.

8. The pipeline leak detection method based on thermal imaging according to claim 7 is characterized in that: The host obtains a preset distance value, including: The host obtains the distance between the water inlet and the water outlet of the pipeline to be tested, and marks it as the pipeline spacing; The host determines the preset distance value based on the pipeline spacing, wherein the larger the pipeline spacing is, the larger the preset distance value is, and the smaller the pipeline spacing is, the smaller the preset distance value is.

9. The pipeline leak detection method based on thermal imaging according to claim 6, characterized in that: The system further includes a monitoring headset connected to the host for communication; the host obtains the strength of the sound signal collected by the microphone at each position point in each sub-area to be tested, and then further includes: The host sends the sound signal collected by the microphone to the monitoring earphone, and plays it through the monitoring earphone.

10. A pipeline leak detection system based on thermal imaging, characterized in that: A pipeline leak detection method based on thermal imaging as described in any one of claims 1 to 9 is applied; the system includes a main unit, a hot water circulation component and an infrared thermal imager; the hot water circulation component includes a first water pump, a second water pump, a water tank and a heating module; the water inlet end of the first water pump is connected to the water tank; the water outlet end of the first water pump is connected to the water inlet end of the pipeline to be tested; the water inlet end of the second water pump is connected to the water outlet end of the pipeline to be tested; the water outlet end of the second water pump is connected to the water tank; the heating module is arranged in the water tank; the infrared thermal imager is communicatively connected to the main unit; the first water pump and the second water pump are both electrically connected to the main unit.

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