A laser reflection type pipeline leak detection method and apparatus

Abstract

The application discloses a kind of laser reflection type pipeline leakage detection method and device, the detection method includes: by laser emitting unit, detection laser is emitted to pipeline inner wall;By photoelectric receiving unit, reflected laser after pipeline inner wall is reflected is received, and reflected laser is converted into voltage signal;Voltage signal is received by signal processing analysis unit, and whether pipeline is leaked is determined according to the amplitude of voltage signal.Such, by detection laser, pipeline inner wall is scanned, since the diameter of laser beam is small, the spatial resolution accuracy of measurable leakage point is high, and the detection of pipeline tiny leakage can be realized.

Description

Technical Field

[0001] This application relates to the field of pipeline leak detection technology, and in particular to a laser reflection pipeline leak detection method and device. Background Technology

[0002] Pipeline transportation is an important mode of transport besides roads, railways, airplanes, and ships, playing a vital role in national economic development. Pipeline transportation typically offers advantages such as strong long-distance transport capacity, economic convenience, and the ability to transport a wide variety of media. It is an ideal method for transporting oil, natural gas, and chemical raw materials. However, because pipeline transported media often possess inherent dangers, such as flammable and explosive natural gas, leaks can cause significant harm to the surrounding environment and human lives. Therefore, predicting the health status of pipelines in advance and preventing leaks is crucial for the safe operation of pipelines.

[0003] Current pipeline leak detection methods typically rely on pressure changes, such as the acoustic leak location method using sensors arranged on the same side (CN105953080A). However, a sufficiently large leak is usually required to cause a pressure change. In cases of small leaks caused by weld defects or pipe corrosion, the pressure change within the pipeline is minimal, making existing pipeline leak detection methods ineffective for detecting minute leaks. Summary of the Invention

[0004] This application provides a laser reflection-based pipeline leak detection method and apparatus, which solves the problem that existing technologies cannot detect minute pipeline leaks.

[0005] To achieve the above objectives, the technical solution of this invention is as follows:

[0006] In a first aspect, embodiments of the present invention provide a laser reflection-based pipeline leak detection method, which involves emitting a detection laser towards the inner wall of a pipeline through a laser emitting unit; receiving the reflected laser after reflection from the inner wall of the pipeline through a photoelectric receiving unit and converting the reflected laser into a voltage signal; and receiving the voltage signal through a signal processing and analysis unit and determining whether the pipeline is leaking based on the amplitude of the voltage signal.

[0007] In some possible implementations, the laser emitting unit, photoelectric receiving unit, and signal processing and analysis unit are located inside the detection device and can move with the detection device inside the pipeline.

[0008] In some possible implementations, the laser emitting unit includes a laser and a beam expanding and collimating structure; the laser is used to emit a probe laser; the beam expanding and collimating structure is disposed on the exit surface of the laser and is used to expand the probe laser beam and collimate the expanded probe laser beam into parallel light.

[0009] In some possible implementations, the laser emitting unit also includes a scanning galvanometer structure; the scanning galvanometer structure is disposed on the output surface of the beam expander and collimator structure and is used to control the optical path of the probe laser.

[0010] In some possible implementations, the photoelectric receiving unit includes a receiving lens structure and a photoelectric detection structure; the receiving lens structure is used to receive the reflected laser and transmit the reflected laser to the photoelectric detection structure; the photoelectric detection structure is used to convert the reflected laser into a voltage signal according to the light signal intensity of the reflected laser.

[0011] In some possible implementations, the receiving lens structure includes at least one Fresnel lens.

[0012] In some possible implementations, the detection device also includes a communication unit for sending voltage signals to a host computer control system.

[0013] In some possible implementations, the detection device also includes a positioning unit for determining the position of the detection device in the pipeline.

[0014] In some possible implementations, the detection device also includes a power module for supplying power to the detection device.

[0015] Secondly, embodiments of the present invention provide a laser reflection-based pipeline leak detection device, comprising: a laser emitting unit for emitting a detection laser towards the inner wall of a pipeline; a photoelectric receiving unit for receiving the reflected laser after reflection from the inner wall of the pipeline and converting the reflected laser into a voltage signal; and a signal processing and analysis unit for receiving the voltage signal and determining whether the pipeline is leaking based on the amplitude of the voltage signal.

[0016] In some possible implementations, the laser emitting unit, the photoelectric receiving unit, and the signal processing and analysis unit are housed within the detection device, which is capable of moving within the pipeline.

[0017] In some possible implementations, the laser emitting unit includes a laser and a beam expanding and collimating structure; the laser is used to emit a probe laser; the beam expanding and collimating structure is disposed on the exit surface of the laser and is used to expand the probe laser beam and collimate the expanded probe laser beam into parallel light.

[0018] In some possible implementations, the laser emitting unit also includes a scanning galvanometer structure; the scanning galvanometer structure is disposed on the output surface of the beam expander and collimator structure and is used to control the optical path of the probe laser.

[0019] In some possible implementations, the photoelectric receiving unit includes a receiving lens structure and a photoelectric detection structure; the receiving lens structure is used to receive the reflected laser and transmit the reflected laser to the photoelectric detection structure; the photoelectric detection structure is used to convert the reflected laser into a voltage signal according to the light signal intensity of the reflected laser.

[0020] In some possible implementations, the receiving lens structure includes at least one Fresnel lens.

[0021] In some possible implementations, the detection device also includes a communication unit for sending voltage signals to a host computer control system.

[0022] In some possible implementations, the detection device also includes a positioning unit for determining the device's position within the pipeline. The detection device also includes a power module for supplying power to the device.

[0023] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0024] In this invention, a laser emitting unit emits a detection laser towards the inner wall of the pipe, a photoelectric receiving unit receives the reflected laser light reflected back from the inner wall of the pipe and converts the reflected laser light into a voltage signal, and a signal processing and analysis unit receives the voltage signal and determines whether there is a leak in the pipe based on the amplitude of the voltage signal. Thus, by scanning the inner wall of the pipe with a detection laser, the small diameter of the laser beam allows for high spatial resolution of the leak point, enabling the detection of even minor leaks in the pipe. Attached Figure Description

[0025] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic flowchart of an embodiment of a laser reflection-based pipeline leak detection method according to the present invention;

[0027] Figure 2a This is a front view of the cross-section of the detection device inside the pipeline;

[0028] Figure 2b This is a cross-sectional side view of the detection device inside the pipeline;

[0029] Figure 3 This is a schematic diagram of the voltage signal amplitude under the condition of whether the pipeline has a leak or not, in an embodiment of the present invention;

[0030] Figure 4This is a schematic diagram of a laser reflection-type pipeline leak detection device according to an embodiment of the present invention. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0032] In the relevant descriptions of this embodiment, the terms "including," "containing," and "possessing" are all open terms and are generally understood to include but not be limited to; the term "at least one" is generally understood to mean one or more, where "multiple" refers to two or more; the term "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items, for example, "at least one of a, b, or c", or "at least one of a, b, and c", which can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple; the symbol "A / B" is used to describe the selection relationship of associated objects, generally indicating an "or" relationship.

[0033] In the following description of the embodiments, the terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms "a" and "the" as used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0034] Those skilled in the art should understand that, in the following description of the embodiments of this application, the sequence of numbers does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0035] Those skilled in the art will understand that the numerical ranges in the embodiments of this application should be understood to specifically disclose each intermediate value between the upper and lower limits of the range. Any stated value or intermediate value within a stated range, as well as any other stated value or each smaller range between intermediate values ​​within a range, are also included within this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0036] Unless otherwise stated, the technical / scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. While this application describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this application. All references to this specification are incorporated by way of citation to disclose and describe the methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0037] To illustrate the technical solution of the present invention, specific embodiments are described below.

[0038] Pipeline transportation is an important mode of transport besides roads, railways, airplanes, and ships, playing a vital role in national economic development. Pipeline transportation typically offers advantages such as strong long-distance transport capacity, economic convenience, and the ability to transport a wide variety of media. It is an ideal method for transporting oil, natural gas, and chemical raw materials. However, because pipeline transported media often possess inherent dangers, such as flammable and explosive natural gas, leaks can cause significant harm to the surrounding environment and human lives. Therefore, predicting the health status of pipelines in advance and preventing leaks is crucial for the safe operation of pipelines.

[0039] Current pipeline leak detection methods typically rely on pressure changes, such as the acoustic leak location method using sensors arranged on the same side (CN105953080A). However, a sufficiently large leak is usually required to cause a pressure change. In cases of small leaks caused by weld defects or pipe corrosion, the pressure change within the pipeline is minimal, making existing pipeline leak detection methods ineffective for detecting minute leaks.

[0040] Based on this, the present invention provides a laser reflection-based pipeline leak detection method, which solves the problem that existing technologies cannot detect minute pipeline leaks.

[0041] Figure 1 This is a schematic flowchart of an embodiment of a laser reflection-based pipeline leak detection method according to the present invention. See also... Figure 1 As shown, the detection method may include:

[0042] S101, a detection laser is emitted into the inner wall of the pipe through a laser emitting unit;

[0043] S102 receives the reflected laser light after it is reflected by the inner wall of the pipe through the photoelectric receiving unit, and converts the reflected laser light into a voltage signal;

[0044] S103 receives voltage signals through the signal processing and analysis unit and determines whether the pipeline is leaking based on the amplitude of the voltage signals.

[0045] The aforementioned pipeline leak detection method can be applied to any type of pipeline. For example, pipelines used to transport liquid media such as petroleum and various chemical raw materials, or gaseous media such as natural gas, oxygen, nitrogen, and carbon dioxide.

[0046] Understandably, since this invention detects pipeline leaks by emitting a detection laser, the laser beam may be deflected due to refraction in the liquid, potentially affecting the detection results. Therefore, for pipelines transporting liquids, the pipeline leak detection method provided in this invention can be performed when there is no transport medium inside the pipeline. For example, this applies to newly installed pipelines or pipelines where the transport medium has been emptied during maintenance. In short, to improve the accuracy of the detection results, for pipelines transporting liquids, this invention requires that there is no transport medium inside the pipeline before the pipeline leak detection method provided in this invention can be used.

[0047] In some embodiments, the laser emitting unit, the photoelectric receiving unit, and the signal processing and analysis unit are disposed within the detection device, and the detection device is movable within the pipeline.

[0048] Understandably, laser emitting units scan the inner wall of pipes by emitting lasers, and a single laser emitting unit may not be sufficient to scan the entire pipe. Therefore, by moving the detection device, the laser emitting unit can scan every area of ​​the inner wall of the pipe, thereby achieving overall leak detection of the pipe.

[0049] In some embodiments, the shape of the detection device can be arbitrary. However, since the detection device needs to be able to move within the pipe, its size needs to be smaller than the inner diameter of the pipe.

[0050] For example, the detection device can be a sphere, a cube of various shapes, or any irregular shape. For instance, the detection device can be a spherical shell integrating functional modules such as a laser emitting unit, a photoelectric receiving unit, and a signal processing and analysis unit. Alternatively, the detection device can consist only of these functional modules, without an external shell. In short, the detection device only needs to be able to move within the pipe; this embodiment of the invention does not specifically limit the shape of the detection device.

[0051] In some embodiments, the movement of the detection device within the pipeline may be achieved by the detection device itself being equipped with a moving device.

[0052] For example, the mobile device can be a wheeled or tracked mobile device, powered by its own onboard drive power supply. Alternatively, the mobile device can be any type of robotic arm device, driven by a stepper motor.

[0053] In other embodiments, the movement of the detection device within the pipeline can also be achieved by the flow of the transport medium within the pipeline.

[0054] For example, taking a natural gas transportation pipeline as an example, the detection device is located inside the natural gas pipeline. During the transportation of natural gas, the detection device moves along with the pipeline. By following the flow of natural gas throughout the pipeline, the detection device achieves overall pipeline inspection.

[0055] Figure 2 is a schematic diagram of the detection device moving within a pipeline in an embodiment of the present invention. The detection device is a spherical shell that floats at the center of the pipeline under the influence of the gas inside and can move with the gas flow. (See Figure 2.) Figure 2a This is a front view of the cross-section of the detection device inside the pipeline. Figure 2b This is a cross-sectional side view of the detection device inside the pipeline.

[0056] Understandably, the laser emitting unit scans the inner wall of the pipe 360° by emitting a probe laser. However, laser light emitted directly from the laser often suffers from divergence and offset. For example, excessively large cross-sectional areas of the laser beam can lead to uneven energy distribution, affecting the quality of laser irradiation and causing beam divergence. Alternatively, a deviation in the center of the laser beam can prevent it from accurately irradiating the target location, resulting in beam offset. Therefore, correction and adjustment of the laser beam are necessary.

[0057] Based on this, in some embodiments, the laser emitting unit may include a laser and a beam expanding and collimating structure.

[0058] Laser, used to emit detection laser;

[0059] The beam expander and collimator structure is located on the output surface of the laser and is used to expand the probe laser beam and collimate the expanded probe laser beam into parallel light.

[0060] A beam expander and collimator is a device composed of a series of lenses and mirrors. By using a beam expander and collimator, the divergence angle of the laser beam can be reduced, making it more collimated. It can also adjust the shape and size of the laser beam to meet application requirements. Beam expanders and collimators are widely used in laser processing, laser detection, and lidar. The principle of a beam expander and collimator is to refract and reflect the laser beam through lenses and mirrors, thereby changing the direction and shape of the laser beam. Lenses can change the focusing state of the laser beam, while mirrors can reflect the laser beam back to its original path or change its direction. A beam expander and collimator typically includes a front transmission beam expander and collimator group and a rear reflection beam expander and collimator group. The front transmission beam expander and collimator group includes a biconcave negative mirror, a biconvex positive mirror, and two meniscus positive mirrors. The rear reflection beam expander and collimator group includes two parabolic mirrors with the same focal position, one a small-aperture parabolic mirror and the other a large-aperture parabolic mirror. The beam expander and collimator structure is compact, small in size, has a large beam expansion ratio and high collimation performance, and can be used in fields such as holographic imaging, optical testing, and lidar.

[0061] In this embodiment of the invention, the laser and the beam expander collimation structure can be any existing type of equipment, as long as their size can be set within the detection device.

[0062] In some embodiments, the laser emitting unit further includes a scanning galvanometer structure.

[0063] The scanning galvanometer structure is located on the output surface of the beam expander and collimator structure and is used to control the optical path of the probe laser.

[0064] The scanning galvanometer structure enables precise laser scanning. It typically includes: a reflecting mirror, controlled by a scanning motor to oscillate around its axis; a scanning motor to drive the reflecting mirror's deflection; a control driver to convert computer-sent signals into control voltage / current signals to drive the scanning motor; an optical system, usually including lenses and mirrors, for focusing and reflecting the laser beam; and a controller to receive signals from the computer and convert them into control voltage / current signals to drive the motor's deflection. By controlling the deflection of the reflecting mirror, the scanning galvanometer structure can direct the laser beam in any desired direction, achieving precise laser scanning and providing a high-precision, high-speed solution for various laser processing and micromachining applications.

[0065] Understandably, the probe laser emitted by the laser, after being processed by the beam expander and collimator, is emitted as parallel light to scan the inner wall of the pipe. However, the angular range of a single laser is limited. To achieve continuous 360° scanning of the pipe's inner wall without deflecting the laser beam, multiple lasers could be combined, or a single laser could be used to scan at different angles multiple times. However, using multiple lasers not only incurs additional costs but could also result in an excessively large detection device that cannot be placed inside the pipe. Furthermore, multiple scans at different angles with a single laser are inefficient. Therefore, by placing the scanning galvanometer structure on the output surface of the beam expander and collimator, and controlling the deflection of the probe laser's beam, a single laser can scan any angle around the inner wall of the pipe.

[0066] In some embodiments, the photoelectric receiving unit includes a receiving lens structure and a photoelectric detection structure.

[0067] The receiving lens structure is used to receive the reflected laser and transmit it to the photodetector structure; the photodetector structure is used to convert the reflected laser into a voltage signal based on the intensity of the reflected laser light signal.

[0068] The receiving lens structure includes at least one Fresnel lens, which is used to focus light onto a single point for subsequent optical processing or detection.

[0069] Fresnel lenses are commonly used in various optical systems, such as telescopes, microscopes, infrared receivers, and lidar. In these applications, the function of a Fresnel lens receiving system is to focus light from a distant object onto a single point for subsequent optical processing or detection. The advantages of Fresnel lens receiving systems include high light transmittance, high resolution, and compactness. Because its surface consists of a series of rings, spherical aberration and coma are partially eliminated, allowing parallel light to be focused onto a single point. Furthermore, its compact structure makes it widely applicable in various small optical systems.

[0070] The photoelectric detection structure consists of a photodetector, an amplifier, and a filter. The photodetector converts incident laser photons into electrons, which are then amplified and converted into a voltage signal. This voltage signal is processed by a filter to eliminate noise and improve signal quality. Based on the intensity of the reflected laser light signal, the photoelectric detection structure can detect the number of photons reflected back from the laser, and thus convert this into a corresponding voltage signal output.

[0071] Understandably, when there is no leak in the pipeline, the pipe wall is intact and there are no leaking holes, so the voltage signal collected by the photodetector is relatively stable. However, when there are leaking holes caused by corrosion in the pipe wall, most of the detection laser will pass through the holes, and the energy of the light signal reflected back from the leak location will decrease rapidly. As a result, the light energy received by the photodetector will be smaller, and the voltage value collected by the system will fluctuate significantly. Thus, after receiving the voltage signal through the signal processing and analysis unit, the presence of a leak in the pipeline can be determined based on the changes in the voltage value corresponding to the received reflected laser light.

[0072] In some embodiments, the detection device may further include a communication unit for sending voltage signals to a host computer control system.

[0073] The communication unit can be a device or component that implements communication functions, enabling data transmission and communication between different devices or systems. The communication unit can communicate via wired or wireless means and can support different communication protocols and technologies, such as serial communication, network communication, and wireless communication. In this embodiment of the invention, wireless communication can be used to facilitate the movement of the detection device within the pipeline.

[0074] The communication unit can be a separate functional unit within the aforementioned detection device, or it can be integrated into the signal processing and analysis unit module. The design and implementation of the communication unit can be customized and optimized according to specific application requirements. It can be implemented using different hardware and software methods, such as embedded systems, modular hardware and software, etc.

[0075] A host computer is a computer that can directly issue control commands, such as a personal computer (PC) or a network server. The host computer can be equipped with a display module that can show changes in voltage signals and / or pipeline leak detection results. In this way, through the display module, managers can intuitively observe whether there is a leak in the pipeline.

[0076] For example, Figure 3 This is a schematic diagram showing the voltage signal amplitude under different pipeline conditions (with and without leakage) in an embodiment of the present invention. See also... Figure 3 As shown, with the same number of sampling points, when there is a leak in the pipeline, the amplitude of the collected voltage signal is higher due to the large fluctuation of the voltage value.

[0077] In some embodiments, determining whether a pipe is leaking based on the amplitude of the voltage signal can be performed within a signal processing and analysis unit or on a host computer.

[0078] For example, after receiving a voltage signal, the signal processing and analysis unit can directly analyze the state of the voltage signal to determine the pipeline leakage situation, and send the voltage signal and the detection results of the pipeline leakage situation to the host computer for display. Alternatively, after receiving a voltage signal, the signal processing and analysis unit can also directly send the voltage signal to the host computer through the communication unit, and the host computer can analyze the pipeline leakage situation based on the voltage signal.

[0079] In some embodiments, the detection device further includes a positioning unit for determining the position of the detection device in the pipeline.

[0080] The positioning unit can be a GPS or BeiDou positioning module built into the detection device.

[0081] Understandably, the detection device scans the pipeline as it moves within it, simultaneously sending voltage signals to the host computer in real time. If the voltage signal amplitude indicates a leak, the device's positioning unit can determine its location in real time, thus pinpointing the leak.

[0082] In some embodiments, the detection device may further include a power module for supplying power to the detection device.

[0083] Understandably, each functional unit in the detection device requires a power source to operate. Examples include mobile devices, communication units, and lasers. A power module can provide unified power to each functional unit within the detection device that requires power.

[0084] In this embodiment of the invention, a laser emitting unit emits a detection laser towards the inner wall of the pipe, a photoelectric receiving unit receives the reflected laser light reflected back from the inner wall of the pipe and converts the reflected laser light into a voltage signal, and a signal processing and analysis unit receives the voltage signal and determines whether there is a leak in the pipe based on the amplitude of the voltage signal. The laser intensity detection method is low-cost, simple in structure, and eliminates the need for expensive magnetic flux leakage detectors; it also eliminates the need for additional sensors or structural components on the pipe, saving on construction and installation costs; furthermore, the built-in GPS / BeiDou positioning module records the latitude and longitude coordinates of the leak point, ensuring accurate location; and due to the small diameter of the laser beam, the spatial resolution of the measurable leak point is high, solving the problems of traditional technologies being insensitive to pipe pressure, requiring high pressure differences, and being unable to detect leaks smaller than millimeters.

[0085] Based on the same inventive concept, embodiments of the present invention provide a laser reflection pipeline leak detection device, which includes several functional units for implementing the above-described laser reflection pipeline leak detection method.

[0086] Figure 4This is a schematic diagram of a laser reflection-type pipeline leak detection device according to an embodiment of the present invention. See also... Figure 4 As shown, the laser reflection-type pipeline leak detection device 400 may include:

[0087] Laser emitting unit 401 is used to emit a detection laser towards the inner wall of the pipe;

[0088] The photoelectric receiving unit 402 is used to receive the reflected laser light after it is reflected by the inner wall of the pipe, and convert the reflected laser light into a voltage signal.

[0089] The signal processing and analysis unit 403 is used to receive voltage signals and determine whether the pipeline is leaking based on the amplitude of the voltage signals.

[0090] In some possible implementations, the laser emitting unit, the photoelectric receiving unit, and the signal processing and analysis unit are housed within the detection device, which is capable of moving within the pipeline.

[0091] In some possible implementations, the laser emitting unit includes a laser and a beam expanding and collimating structure; the laser is used to emit a probe laser; the beam expanding and collimating structure is disposed on the exit surface of the laser and is used to expand the probe laser beam and collimate the expanded probe laser beam into parallel light.

[0092] In some possible implementations, the laser emitting unit also includes a scanning galvanometer structure; the scanning galvanometer structure is disposed on the output surface of the beam expander and collimator structure and is used to control the optical path of the probe laser.

[0093] In some possible implementations, the photoelectric receiving unit includes a receiving lens structure and a photoelectric detection structure; the receiving lens structure is used to receive the reflected laser and transmit the reflected laser to the photoelectric detection structure; the photoelectric detection structure is used to convert the reflected laser into a voltage signal according to the light signal intensity of the reflected laser.

[0094] In some possible implementations, the receiving lens structure includes at least one Fresnel lens.

[0095] In some possible implementations, the detection device also includes a communication unit for sending voltage signals to a host computer control system.

[0096] In some possible implementations, the detection device also includes a positioning unit for determining the device's position within the pipeline. The detection device also includes a power module for supplying power to the device.

[0097] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0098] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A laser reflection-based pipeline leak detection method, characterized in that, include: A detection laser is emitted into the inner wall of the pipe through a laser emitting unit; The reflected laser light after being reflected by the inner wall of the pipe is received by the photoelectric receiving unit, and the reflected laser light is converted into a voltage signal; The voltage signal is received by the signal processing and analysis unit, and the presence or absence of a leak in the pipeline is determined based on the amplitude of the voltage signal. The laser emitting unit, the photoelectric receiving unit, and the signal processing and analysis unit are disposed within the detection device, which is capable of moving within the pipeline. The laser emitting unit includes a laser and a beam expanding and collimating structure; The laser is used to emit the detection laser; The beam expanding and collimating structure is disposed on the emission surface of the laser and is used to expand the probe laser beam and collimate the expanded probe laser beam into parallel light. The laser emitting unit further includes: a scanning galvanometer structure; The scanning galvanometer structure is disposed on the output surface of the beam expander and collimator structure and is used to control the optical path of the probe laser; The photoelectric receiving unit includes a receiving lens structure and a photoelectric detection structure; The receiving lens structure is used to receive the reflected laser and transmit the reflected laser to the photoelectric detection structure; The photoelectric detection structure is used to convert the reflected laser into a voltage signal based on the intensity of the reflected laser light signal; The receiving lens structure includes at least one Fresnel lens; The detection device also includes a communication unit for sending the voltage signal to the host computer control system; The detection device also includes a positioning unit for determining the position of the detection device in the pipeline; The detection device also includes a power module for supplying power to the detection device.

2. A laser reflection-based pipeline leak detection device, characterized in that, Includes: a laser emitting unit for emitting detection lasers into the inner wall of the pipe; A photoelectric receiving unit is used to receive the reflected laser light after it has been reflected by the inner wall of the pipe, and to convert the reflected laser light into a voltage signal. The signal processing and analysis unit is used to receive the voltage signal and determine whether the pipeline is leaking based on the amplitude of the voltage signal.

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