Dike safety detection method based on muon rays and muon detection device
By screening muon rays through a muon detector array and using the excitation point and incident direction to determine whether the muon rays have passed through the dam, the problem of muon rays interfering with imaging is solved, and high-precision and non-destructive imaging for dam safety detection is achieved.
Patent Information
- Application Number
- CN202511011244.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-22
- Publication Date
- 2025-09-16
AI Technical Summary
When using a muon detector for dam inspection, how to effectively filter out which muon rays received have passed through the measured area to prevent muon rays that have not passed through the measured area from interfering with the imaging process.
Muon rays are received by a muon detector array. The screening principle is that when adjacent muon detectors flash successively within a set time range, they are determined to be the same muon ray. Combined with the coordinates of the excitation point and the incident direction, it is determined whether the muon ray passes through the dam under test. The incident direction range is adjusted using a rotating and moving device to achieve 360° automatic adjustment of the muon detector.
It can effectively screen out muon rays that pass through the dam under test, generate a three-dimensional image of the dam, discover changes in the internal structure, provide a basis for safety assessment and maintenance, and improve detection accuracy and reliability.
Smart Images
Figure CN120652519A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a dam safety detection method based on muon rays and a muon detection device, belonging to the field of dam safety detection. Background Art
[0002] High-energy particles in cosmic rays produce secondary cosmic rays when they rub against the atmosphere, and cosmic ray muons are one such type. Cosmic ray muon imaging is a nondestructive imaging method that uses naturally occurring muon radiation to reveal the internal structure of an object by analyzing differences in its transmission or scattering properties across different materials. This technique can be divided into two types: transmission imaging and scattering imaging. Transmission imaging focuses on the intensity attenuation of muons as they pass through an object, while scattering imaging focuses on the changes in the scattering angles of muons within the object. The key advantages of cosmic ray muon imaging technology based on muon detectors lie in its nondestructive nature, high precision, and 3D imaging capabilities. Due to their strong penetrating power, muons can penetrate thick objects and obtain information about their internal structure. Furthermore, this technique does not require the use of any radioactive isotopes or other external radiation sources, making it harmless to the environment and humans.
[0003] However, when using a muon detector to detect the measured area, the muon detector will also receive muon rays that have not passed through the measured area. These muon rays will interfere with the imaging process and affect the image quality. Summary of the Invention
[0004] The purpose of the present invention is to provide a dam safety detection method based on muon rays and a muon detection device to solve the problem of how to filter out which rays have passed through the detected area from the received muon rays.
[0005] To achieve the above object, the solution of the present invention includes:
[0006] A muon ray-based dam safety detection method of the present invention includes the following steps: 1) receiving a first muon ray at a current detection time by a muon detection device positioned toward the dam under test, the muon detection device including a detection unit, the detection unit including a muon detector array having multiple muon detectors in each row and column, the muon detectors including cubic scintillators; 2) screening a second muon ray that passes through the dam under test at the current detection time from the first muon ray; 3) performing a safety detection on the dam under test based on the second muon ray;
[0007] The screening principles include: within a set time range, when adjacent muon detectors in the muon detector array flash successively, it is determined that they are excited by the same first muon ray; the incident direction of the first muon ray is obtained based on the corresponding excitation point of the first muon ray in the corresponding flashing muon detector; when the incident direction is within a preset direction range toward the dam being measured, the first muon ray is determined to be a second muon ray.
[0008] Furthermore, the Z-axis coordinate of the excitation point coordinate is obtained based on the signal intensity received by the silicon photomultiplier tube set at the bottom of the scintillator of the excited muon detector and the correspondence between the pre-obtained Z-axis coordinate and the signal intensity received by the silicon photomultiplier tube, and the plane where the X-axis and Y-axis are located is parallel to the surface of the muon detector array.
[0009] Furthermore, the muon detection device also includes a main box body, support columns are arranged on opposite sides of the top of the main box body, and a rotating shaft connected to the detection unit is arranged inside the support columns; the driving motor in the main box body drives the rotating shaft through a synchronous belt to realize the rotation of the detection unit.
[0010] Furthermore, the main box is movable, and a handrail for pushing the muon detection device is provided on one side wall of the main box.
[0011] Furthermore, the detection unit also includes a signal acquisition unit, and the silicon photomultiplier tube is connected to the signal acquisition unit through a wire; the signal acquisition unit is connected to a data processing unit in the main box for pre-processing the signal sent by the signal acquisition unit, and the main box also includes a communication unit for establishing a remote communication connection and a power supply unit for powering the drive motor.
[0012] A muon detection device includes a detection unit, wherein the detection unit includes a muon detector array with multiple muon detectors in each row and column, and the muon detectors include cubic scintillators. The muon detector array is used to screen out muon rays that pass through a dam under detection from all received muon rays based on adjacent and successively scintillated scintillators.
[0013] Furthermore, the muon detection device further includes a main housing, and the detection unit is rotatably disposed on support columns on opposite sides of the top of the main housing.
[0014] Furthermore, a rotating shaft connected to the detection unit is provided in the support column, and a driving motor in the main box drives the rotating shaft through a synchronous belt to realize the rotation of the detection unit.
[0015] Furthermore, the detection unit also includes a signal acquisition unit, and the silicon photomultiplier tube located at the bottom of the scintillator is connected to the signal acquisition unit through a wire; the signal acquisition unit is connected to a data processing unit in the main box for pre-processing the signal sent by the signal acquisition unit, and the main box also includes a communication unit for establishing a remote communication connection and a power supply unit for powering the drive motor.
[0016] Furthermore, the main box is movable, and a handrail for pushing the muon detection device is provided on one side wall of the main box.
[0017] The present invention has the following beneficial effects: This invention is a groundbreaking creation. First, a muon detection device receives a first muon ray at the current moment. The muon detection device comprises a muon detector array with multiple muon detectors in each row and column. When adjacent muon detectors in the muon detector array flash consecutively within a set time range, it can be determined that the ray was excited by the same muon ray. The incident direction of the muon ray is then determined based on the excitation point corresponding to the muon ray. When the incident direction falls within a set range, the muon ray is determined to be the second muon ray that has passed through the dam under test. Safety testing of the dam under test can then be performed based on the second muon ray. The present invention effectively screens received muon rays to identify those that have passed through the dam under test. Furthermore, structural changes within the dam under test can be inferred based on the muon rays that have passed through the dam under test, providing a scientific basis for safety assessment and maintenance of the dam under test. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of a dam safety assessment process of the present invention;
[0019] Figure 2 is a schematic diagram of an imaging system architecture of the present invention;
[0020] Figure 3 This is a schematic diagram of an imaging process of the present invention;
[0021] Figure 4 This is a schematic diagram of a muon detector of the present invention;
[0022] Figure 5 It is a schematic diagram of a detection side of the present invention;
[0023] Figure 6 It is a schematic diagram of the detection front of the present invention;
[0024] Figure 7 This is a schematic diagram of a muon ray passing through a muon detector array according to the present invention;
[0025] Figure 8This is a schematic diagram of determining the incident direction of the present invention;
[0026] Figure 9 It is a schematic diagram of determining a direction range of the present invention;
[0027] Figure 10 This is a schematic structural diagram of a muon detection device according to the present invention;
[0028] Figure 11 This is a schematic diagram of the usage status of a muon detection device of the present invention. DETAILED DESCRIPTION
[0029] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and implementation methods.
[0030] The concept of the present invention is that Figure 1 As shown, a muon detector array is used to receive all muon rays in the detection area, and muon rays that pass through the dam under test are screened out from all received muon rays according to predefined screening rules, so as to perform safety inspection of the dam based on the muon rays that pass through the dam under test.
[0031] Method implementation method:
[0032] This embodiment provides a dam safety detection method based on muon rays, such as Figure 2 As shown, the muon detection device of the present invention first detects the detection area containing the dam under test. The muon detection device then screens the first muon rays collected within the detection area and selects second muon rays that pass through the dam under test from all the first muon rays. The second muon rays are then sent to a data acquisition system, which then transmits them to a data analysis system via a communication system. The data analysis system then performs data fusion analysis on the received second muon rays and an imported dam model, transmitting the analysis results to an imaging system. Ultimately, the imaging system displays a three-dimensional image of the dam. This three-dimensional image not only shows the dam's three-dimensional appearance but also its internal three-dimensional structure. Therefore, based on this three-dimensional image, it is possible to analyze whether cavities, cracks, ant holes, and other structures are present within the dam. Based on the analysis results, it is possible to determine whether the dam has safety hazards, thereby establishing a corresponding early warning mechanism to ensure dam safety.
[0033] like Figure 3As shown, since the three-dimensional shape data of the dam is also required when generating a three-dimensional image of the dam, the dam needs to be mapped before detection to determine the shape structure of the dam. Based on the mapping data, a three-dimensional shape model of the dam is drawn, and then the three-dimensional shape model is imported into the data analysis system, combined with the muon rays collected by the data acquisition system to perform data fusion and output the final three-dimensional image of the dam.
[0034] The muon detection device used in the present invention includes a muon detector array, each column and each row of the array is provided with at least a plurality of muon detectors. The muon detectors used in the present invention are as follows: Figure 4 As shown, the system includes a scintillator, a silicon photomultiplier tube (SPM), and wires. When muon rays pass through the muon detector, they stimulate the generation of scintillation light in the detector. The scintillation light propagates through the scintillator and is finally received by the SPM at the bottom of the scintillator. This light signal is then converted into an electrical signal, which is then collected by the corresponding acquisition unit.
[0035] Furthermore, when using the muon detection device to detect the dam to be tested, the muon detection device is placed on the back side of the dam and faces the area to be tested on the dam body at a certain angle, such as Figure 5 and Figure 6 As shown in the figure, the dotted lines represent muon rays. The muon rays used in the final imaging are those that have passed through the dam under test. However, in practice, when the muon detector detects in its corresponding detection area, it also receives muon rays that have not passed through the dam under test. These muon rays will interfere with the imaging results. Therefore, it is necessary to determine a corresponding filtering rule to filter out the muon rays that have passed through the dam under test (second muon rays) from all the received muon rays (first muon rays).
[0036] Specifically, when all muon rays within the detection area strike the muon detector array, they stimulate the scintillators in the muon detectors within the array to scintillate. The same muon ray, when striking the muon detector array, can stimulate the scintillation of adjacent scintillators. Muon rays propagate at the speed of light, so if adjacent scintillators scintillate in a very short period of time when struck by the same muon ray, this indicates that the same muon ray has excited them. A coordinate system is then established to determine the coordinates of the excitation point when the same muon ray excites the scintillators. Based on the coordinates of the excitation point, the corresponding azimuth angle of the muon ray is determined. If the obtained azimuth angle falls within a set azimuth angle range, the muon ray is determined to have passed through the dam under test.
[0037] For example, Figure 7As shown in the figure, adjacent muon detectors in the muon detector array are triggered in succession within a very short period of time: first, point C of muon detector 1 is excited, followed by point B of muon detector 2, and finally point A of muon detector 3. These three excitation points are excited in close succession with extremely short intervals, so they can be considered to be excited by the same muon ray passing through muon detectors 1, 2, and 3, respectively.
[0038] To establish a three-dimensional coordinate system, first consider the surface of the muon detector array as a plane, with this plane serving as the plane formed by the X-axis and Y-axis of the three-dimensional coordinate system. At this point, the two-dimensional coordinates (X-axis and Y-axis) of the excitation point of each muon detector when excited can be directly obtained. Since the longer the distance the light signal propagates in the scintillator, the weaker the light signal, if the distance from the top of the muon detector to the silicon photomultiplier tube is known, the Z-axis coordinate of the corresponding excitation point can be inferred from the strength of the light signal received by the silicon photomultiplier tube. As a specific embodiment of the present invention, based on a large number of experiments, a correspondence is pre-established between the distance the light signal propagates in the scintillator and the intensity of the light signal received by the silicon photomultiplier tube, thereby establishing a correspondence between the Z-axis coordinate of the excitation point and the signal intensity received by the silicon photomultiplier tube.
[0039] Further, we can get Figure 7 A(x1, y1, z1), B(x2, y2, z2), C(x3, y3, z3), the three excitation coordinates can be used to obtain the incident direction of the muon ray corresponding to the three excitation points. When the obtained incident direction is within the preset direction range towards the measured dam, it is determined that the muon ray is a muon ray that passes through the measured dam. For example, Figure 8 As shown, the dotted line represents the muon ray, and the solid line represents the discovery that is always perpendicular to the surface of the muon detector array. When the angle between the muon ray and the normal is within a set range, it can be determined that the incident direction of the muon ray is within the preset direction range towards the dam being measured.
[0040] Specifically, the preset direction range towards the dam to be measured is related to the height of the dam, the length of the dam, the distance between the muon detection device and the dam, the placement angle of the muon detector array, etc. This embodiment provides a simple example, such as Figure 9As shown, at a certain distance from the dam, the muon detector's detection unit is adjusted to a certain angle. Based on the muon rays a, b, c, and d in the figure, a corresponding directional range is determined. Any incident direction within this directional range is considered to be a muon ray that has passed through the dam. The received muon rays a, b, c, and d are analyzed to determine the angles between them and the normal to the muon detector array plane. The preset directional range is determined based on these angles.
[0041] The muon detection device used in the present invention is as follows Figure 10 As shown, it is mainly divided into two parts, the upper movable part is the detection unit, and the lower layer is the main box, which includes the detection unit, data processing unit, power supply unit, communication unit, rotating shaft, synchronous belt, armrest, drive motor and casters.
[0042] The detection unit includes a muon detector array and a signal acquisition unit. The wires of each muon detector in the muon detector array are connected to the signal acquisition unit. The signal acquisition unit sends the electrical signal converted from the optical signal by the silicon photomultiplier tube of the muon detector to the data processing unit. The data processing unit is used to collect and integrate the collected signals and perform pre-processing, namely filtering, denoising and eliminating abnormal signals. The communication unit is used to establish a communication connection with the remote, that is, to transmit the processed data to the data analysis system or the central station database. The power supply unit is used to power the drive motor.
[0043] In order to realize the 360° automatic adjustment of the detection unit, support columns are set on the opposite sides of the top of the main box. A rotating shaft connected to the detection unit is set in the support columns. The driving motor in the main box drives the rotating shaft through a synchronous belt to realize the free steering of the detection unit. The steering diagram is as follows Figure 11 shown.
[0044] In order to realize the more convenient movement of the muon detection device, casters (universal wheels) are correspondingly set at the four top corners of the bottom of the muon detection device. In order to facilitate the dragging of the muon detection device, a handrail is set on an outer side wall of the main box of the muon detection device.
[0045] During dam maintenance and inspection, cosmic ray muon imaging technology can be used to detect cavities, ant holes, seepage paths, and seepage areas within dams, thereby promptly identifying potential safety hazards. By analyzing muon scattering or transmission data within the dam, structural changes and seepage conditions can be inferred, providing a scientific basis for dam safety assessment and maintenance.
[0046] Device implementation method:
[0047] This embodiment provides a muon detection device. The structure and connection relationship of the muon detection device have been given in the method implementation. Since the introduction of the method is clear enough, it will not be repeated here.
[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific embodiments of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.
Claims
1. A dam safety detection method based on muon rays, characterized in that: The method comprises the following steps: 1) receiving a first muon ray at a current detection time by a muon detection device positioned toward the dam under test, the muon detection device comprising a detection unit, the detection unit comprising a muon detector array having a plurality of muon detectors in each row and column, the muon detectors comprising cubic scintillators; 2) screening out a second muon ray that passes through the dam under test at the current detection time from the first muon ray; 3) Conduct safety inspection of the dam under test based on the second muon ray; The screening principles include: within a set time range, when adjacent muon detectors in the muon detector array flash successively, it is determined that they are excited by the same first muon ray; the incident direction of the first muon ray is obtained based on the corresponding excitation point of the first muon ray in the corresponding flashing muon detector; when the incident direction is within a preset direction range toward the dam being measured, the first muon ray is determined to be the second muon ray.
2. The dam safety detection method based on muon rays according to claim 1 is characterized in that: The Z-axis coordinate of the excitation point coordinate is obtained based on the signal intensity received by the silicon photomultiplier tube set at the bottom of the scintillator of the excited muon detector and the correspondence between the pre-obtained Z-axis coordinate and the signal intensity received by the silicon photomultiplier tube. The plane where the X-axis and Y-axis are located is parallel to the surface of the muon detector array.
3. The dam safety detection method based on muon rays according to claim 1 is characterized in that: The muon detection device also includes a main box body, support columns are arranged on opposite sides of the top of the main box body, and a rotating shaft connected to the detection unit is arranged inside the support columns; the driving motor in the main box body drives the rotating shaft through a synchronous belt to realize the rotation of the detection unit.
4. The dam safety detection method based on muon rays according to claim 3 is characterized in that: The main box is movable, and a handrail for pushing the muon detection device is provided on one side wall of the main box.
5. The dam safety detection method based on muon rays according to claim 2 is characterized in that: The detection unit also includes a signal acquisition unit, and the silicon photomultiplier tube is connected to the signal acquisition unit via a wire; the signal acquisition unit is connected to a data processing unit in the main box for pre-processing the signal sent by the signal acquisition unit, and the main box also includes a communication unit for establishing a remote communication connection and a power supply unit for powering the drive motor.
6. A muon detection device, characterized in that: The invention comprises a detection unit, wherein the detection unit comprises a muon detector array having multiple muon detectors in each row and column, and the muon detectors comprise cubic scintillators; the muon detector array is used to screen out muon rays that pass through the dam under test from all received muon rays based on adjacent and successively scintillated scintillators.
7. The muon detection device according to claim 6, characterized in that: The muon detection device further includes a main housing, and the detection unit is rotatably disposed on support columns on two opposite sides of the top of the main housing.
8. The muon detection device according to claim 7, characterized in that: A rotating shaft connected to the detection unit is arranged in the support column, and a driving motor in the main box drives the rotating shaft through a synchronous belt to realize the rotation of the detection unit.
9. The muon detection device according to claim 8, characterized in that: The detection unit also includes a signal acquisition unit, and the silicon photomultiplier tube located at the bottom end of the scintillator is connected to the signal acquisition unit through a wire; the signal acquisition unit is connected to a data processing unit in the main box for pre-processing the signal sent by the signal acquisition unit, and the main box also includes a communication unit for establishing a remote communication connection and a power supply unit for powering the drive motor.
10. The muon detection device according to claim 9, characterized in that: The main box is movable, and a handrail for pushing the muon detection device is provided on one side wall of the main box.