Magneto-optical imaging integrated probe and parameter self-adjusting method thereof

Abstract

The invention belongs to the technical field of oil and gas device detection, and particularly relates to a magneto-optical imaging integrated probe and a parameter self-adjusting method thereof. The magneto-optical imaging integrated probe has a vertical projection-acquisition optical path and a small sensing gap, and has higher defect imaging definition and equipment integration layout; in addition, the invention further provides a probe parameter self-adjusting method which can meet the detection requirements of diversified working conditions, and the self-adaptability of the probe is effectively improved. The invention discloses a parameter self-adjusting method of a magneto-optical imaging integrated probe. The parameter self-adjusting method comprises the following steps: acquiring the maximum leakage magnetic field intensity at a defect part of a to-be-detected piece; constructing a three-dimensional simulation model of the magneto-optical imaging integrated probe; performing optical physical field setting on geometric structures of all parts of the three-dimensional simulation model; performing differential mesh generation on the three-dimensional simulation model; setting scanning parameters of the three-dimensional simulation model, and calculating variable values in the three-dimensional simulation model; and drawing a simulated magneto-optical image.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas device detection, and in particular relates to a magneto-optical imaging integrated probe and a parameter self-adjustment method thereof. Background Art

[0002] Oil and gas pipelines and storage tanks are important equipment in the oil and gas field, and they play an indispensable role in the transportation, transfer, and storage of oil and natural gas. The inventors have found that the working environment of the above equipment is harsh, and it is easy to be affected by mechanical impact, medium corrosion and other factors, resulting in cracks, deformation, corrosion and other defects. Technical personnel are required to regularly inspect and maintain them, so as to implement effective intervention measures before accidents occur, so as to avoid major economic losses and casualties.

[0003] The existing oil and gas equipment detection methods mainly include the following categories: X-ray method, eddy current method, ultrasonic method, magnetic flux leakage method, etc. However, further research found that the above existing oil and gas equipment detection methods have a series of limitations such as low efficiency, insufficient sensitivity and poor intuitiveness; and the detection process relies more on manual experience, and the stability of the detection results is poor. Therefore, it is urgent for technical personnel in this field to develop a detection device with high imaging clarity, high integration, and intelligent parameter adjustment function, so as to provide reliable technical support for oil and gas equipment defect detection. Summary of the invention

[0004] The present invention provides a magneto-optical imaging integrated probe and a method for self-adjusting its parameters. The magneto-optical imaging integrated probe has a vertical "projection-collection" optical path and a smaller sensing gap, thereby having higher defect imaging clarity and equipment integrated layout. In addition, a method for self-adjusting probe parameters is also provided, which can adapt to the detection requirements of diverse working conditions and effectively improve the adaptability of the probe.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A magneto-optical imaging integrated probe, the magneto-optical imaging integrated probe is composed of a linearly polarized light emitting unit, a linearly polarized light modulation unit, a linearly polarized light imaging unit and a clamping mechanism; The clamping mechanism is composed of an inner shell and an outer shell; wherein a linear polarized light passage is also provided between the inner shell and the outer shell; The linear polarized light emitting unit includes an LED light source, a light guide plate and a polarizer; wherein the LED light source is fixedly mounted on the side wall of the inner shell; the light guide plate is fixedly mounted inside the inner shell, and is used to modulate the light output by the LED light source into parallel light in a horizontal direction; the polarizer is fixedly mounted inside the inner shell and is arranged perpendicular to the direction of the parallel light, and is used to modulate the parallel light into linear polarized light; The linear polarization light modulation unit includes a magneto-optical sensor module, a beam splitter, a silicon steel yoke and a neodymium iron boron magnet; wherein the magneto-optical sensor module is fixedly installed inside the inner shell just below the linear polarization light path; the beam splitter is fixedly installed inside the inner shell to reflect the linear polarization light modulated by the polarizer to the position of the magneto-optical sensor module; the neodymium iron boron magnet and the silicon steel yoke are sequentially arranged and installed on the periphery of the linear polarization light path to form a closed magnetic field loop; The linear polarized light imaging unit includes a camera, an analyzer, a camera driving board and a Lemo connector; wherein the analyzer is fixedly installed on the top of the outer shell just above the linear polarized light path, and is used to receive linear polarized light modulated by the leakage magnetic field; the camera, the camera driving board and the Lemo connector are connected to the analyzer in sequence, and are used to convert the optical signal captured by the analyzer into an electrical signal, and transmit it to an external display device.

[0006] Preferably, the magneto-optical sensing module is composed of a magneto-optical film, a mirror coating and a protective coating; wherein the magneto-optical film is used to induce magneto-optical rotation effect in linearly polarized light, the mirror coating is used to reflect linearly polarized light, and the protective coating is used to protect the magneto-optical film and the mirror coating.

[0007] On the other hand, the present invention also provides a method for self-adjusting parameters of a magneto-optical imaging integrated probe, comprising the following steps: Step 1: Obtain the maximum leakage magnetic field intensity at the defect of the test piece; Step 2: Construct a three-dimensional simulation model of the magneto-optical imaging integrated probe; Step 3: Setting the optical physical field for each geometric structure of the three-dimensional simulation model constructed in step 2; Step 4: Perform differential meshing on the three-dimensional simulation model processed in step 3; Step 5: Set scanning parameters for the three-dimensional simulation model processed in step 4, calculate the values ​​of various variables in the three-dimensional simulation model; and draw a simulated magneto-optical image.

[0008] Preferably, the method further comprises the following steps: Step six: Analyze the simulated magneto-optical image obtained in step five to determine the optimal value of each variable in the three-dimensional simulation model.

[0009] Preferably, the step 1 is specifically described as: Place the magneto-optical imaging integrated probe just above the defect of the test piece to stimulate the leakage magnetic field; Use a Tesla meter to measure the maximum leakage magnetic field intensity B at the defect of the test piece.

[0010] Preferably, the step 2 is specifically described as: Use the COMSOL model developer to construct a three-dimensional simulation model of the magneto-optical imaging integrated probe; wherein the constructed three-dimensional simulation model at least includes the simulation of the LED light source, polarizer, magneto-optical film, mirror coating, beam splitter, camera, analyzer, and simplified geometric structure of the light-blocking surface.

[0011] Preferably, the step three is specifically described as: The LED light source is set to emit uniform non-polarized light based on the grid unit, and its light source power is set to W. Then the output light intensity I0 satisfies: (1) ; In formula (1), l and b are the length and width of the light-emitting surface of the LED light source respectively; If the polarizer, magneto-optical film and analyzer are set as linear polarizers, the transmission axis of the polarizer is defined as: (2) ; In formula (2), v p is the direction vector of the polarizer transmission axis, v px , v py and v pz They are v p The projection on the x-axis, y-axis and z-axis, c p is a constant, γ is v p The angle with the horizontal direction; after the parallel light passes through the polarizer, its light intensity becomes I0 / 2; The deflection angle θ of linear polarized light when it passes through the magneto-optical film satisfies: (3) ; In formula (3), V is the Verdet constant, and T is the thickness of the magneto-optical film; The transmission axis of the magneto-optical film is defined as: (4) ; In formula (4), v m is the direction vector of the transmission axis of the magneto-optical film, v mx , v my and v mz They are v m The projection on the x-axis, y-axis and z-axis, c m is a constant; The transmission axis of the analyzer is defined as: (5) ; In formula (5), v d is the direction vector of the polarizer transmission axis, v dx , v dy and v dz They are v d The projection on the x-axis, y-axis and z-axis, c d is a constant; The reflectivity of the beam splitter is set to r, the transmittance is set to 1-r, and the reflection coefficient of the mirror coating is set to 1. Then, after the linearly polarized light passes through the analyzer, its light intensity I D ,satisfy: (6).

[0012] Preferably, the step six is ​​specifically described as follows: Calculate the average grayscale of simulated magneto-optical image , the maximum gray value of the simulated magneto-optical image and the minimum gray value of the simulated magneto-optical image ; Among them, the average grayscale of the simulated magneto-optical image ,satisfy: (8) ; In formula (8), M and N represent the height and width of the simulated magneto-optical image, respectively. Represents pixel Gray value of Maximum grayscale value of simulated magneto-optical image ,satisfy: (9) ; Minimum gray value of simulated magneto-optical image ,satisfy: (10) ; Constructing the evaluation function ; Among them, the evaluation function ,satisfy: (11) ; Calculate the E value under different variable conditions; when the E value is the largest, the corresponding value of each variable in the three-dimensional simulation model is the optimal value.

[0013] The present invention provides a magneto-optical imaging integrated probe and a parameter self-adjustment method thereof, wherein the parameter self-adjustment method comprises the following steps: step one: obtaining the maximum leakage magnetic field intensity at the defect of the test piece; step two: constructing a three-dimensional simulation model of the magneto-optical imaging integrated probe; step three: performing optical physical field settings on the geometric structures of each part of the three-dimensional simulation model constructed in step two; step four: performing differential grid division on the three-dimensional simulation model processed in step three; step five: performing scanning parameter settings on the three-dimensional simulation model processed in step four, calculating the values ​​of each variable in the three-dimensional simulation model; and drawing a simulated magneto-optical image.

[0014] The magneto-optical imaging integrated probe and its parameter self-adjustment method with the above technical features have higher defect imaging clarity and equipment integrated layout by configuring a vertical "cast-collect" optical path and a smaller sensor gap; at the same time, the present invention also provides a probe parameter self-adjustment method that can adapt to the detection needs of diverse working conditions. Compared with the prior art, the technical solution of the present invention has at least the following technical advantages: (1) The device structure has a higher degree of integration and less defocusing, which can effectively improve the clarity of defect detection imaging; (2) It makes up for the deficiency of experience-based parameter adjustment in the existing technology and enhances the applicability of the magneto-optical imaging integrated probe, enabling it to adapt to different working conditions through precise parameter adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the following drawings: Figure 1 A schematic diagram of the structure of the magneto-optical imaging integrated probe provided by the present invention; Figure 2 It is a structural schematic diagram of the magneto-optical sensing module; Figure 3 A schematic flow chart of a method for self-adjusting parameters of a magneto-optical imaging integrated probe provided by the present invention; Figure 4 Schematic diagram of a three-dimensional simulation model of a magneto-optical imaging integrated probe constructed by a parameter self-adjustment method of the magneto-optical imaging integrated probe.

[0016] Reference numerals: 1. LED light source; 2. Light guide plate; 3. Polarizer; 4. PET tape; 5. Magneto-optical sensor module; 501. Magneto-optical film; 502. Mirror coating; 503. Protective coating; 6. Spectroscope; 7. Inner shell; 8. Silicon steel yoke; 9. NdFeB magnet; 10. Camera; 11. Analyzer; 12. Camera driver board; 13. Lemo connector; 14. Outer shell. DETAILED DESCRIPTION

[0017] The present invention provides a magneto-optical imaging integrated probe and a method for self-adjusting its parameters. The magneto-optical imaging integrated probe has a vertical "projection-collection" optical path and a smaller sensing gap, thereby having higher defect imaging clarity and equipment integrated layout. In addition, a method for self-adjusting probe parameters is also provided, which can adapt to the detection requirements of diverse working conditions and effectively improve the adaptability of the probe.

[0018] The present invention provides a magneto-optical imaging integrated probe, such as Figure 1As shown, the magneto-optical imaging integrated probe is composed of a linearly polarized light emitting unit, a linearly polarized light modulation unit, a linearly polarized light imaging unit and a clamping mechanism.

[0019] Specifically, the clamping mechanism is composed of an inner shell 7 and an outer shell 14. It is worth noting that the inner shell 7 is used to provide installation space for structural units such as the LED light source 1, the light guide plate 2, the polarizer 3, the magneto-optical sensor module 5, and the beam splitter 6; the outer shell 14 is used to provide installation space for structural units such as the camera 10, the analyzer 11, and the camera drive board 12. In addition, a linearly polarized light path is also provided between the inner shell 7 and the outer shell 14.

[0020] The linear polarized light emitting unit includes an LED light source 1, a light guide plate 2 and a polarizer 3. The LED light source 1 is fixedly mounted on the side wall of the inner shell 7 to provide a natural light source. In this embodiment, the selected LED light source 1 outputs green natural light with a wavelength of 520 to 530 nm, the light emitting surface size is 15 mm × 15 mm, and the power W is determined according to different light source models. The light guide plate 2 is fixedly mounted inside the inner shell 7 to modulate the light output by the LED light source 1 into parallel light in the horizontal direction; the polarizer 3 is fixedly mounted inside the inner shell 7 and is arranged perpendicular to the direction of the parallel light (by screening the specific polarization component in the parallel natural light), and is used to modulate the parallel light into linear polarized light.

[0021] The linear polarized light modulation unit includes a magneto-optical sensor module 5, a beam splitter 6, a silicon steel yoke 8 and a neodymium iron boron magnet 9. The beam splitter 6 is fixedly mounted inside the inner housing 7 to reflect the linear polarized light modulated by the polarizer 3 to the position of the magneto-optical sensor module 5. The magneto-optical sensor module 5 is fixedly mounted inside the inner housing 7 directly below the linear polarized light path through the PET tape 4.

[0022] As a more preferred embodiment of the present invention, Figure 2 As shown, the magneto-optical sensor module 5 is composed of a magneto-optical film 501, a mirror coating 502 and a protective coating 503. The magneto-optical film 501 (the thickness T of the magneto-optical film is selected to be 0.05 mm, and the Field constant V is 1.04×106 rad / mT) is used to induce magneto-optical rotation effect on linearly polarized light, the mirror coating 502 is used to reflect linearly polarized light, and the protective coating 503 is used to protect the magneto-optical film 501 and the mirror coating 502.

[0023] Furthermore, the NdFeB magnet 9 and the silicon steel yoke 8 are sequentially installed on the periphery of the linear polarized light path. The silicon steel yoke 8 and the NdFeB magnet 9 are used to form a closed magnetic field loop, thereby generating a leakage magnetic field at (directly above) the defect of the test piece.

[0024] The linear polarized light imaging unit includes a camera 10, an analyzer 11, a camera driving board 12 and a Lemo connector 13. The analyzer 11 is fixedly mounted on the top of the outer shell 14 just above the linear polarized light path, and is used to receive linear polarized light modulated by the leakage magnetic field. The camera 10 (the performance parameters of the camera can be referred to as follows: 1280×720 pixels, frame rate 120 frames, pixel size 3m×3m, lens focal length 12mm, external dimensions 8mm×8mm×5mm), the camera driving board 12 and the Lemo connector 13 are sequentially connected to the analyzer 11, and are used to convert the optical signal captured by the analyzer 11 into an electrical signal, and transmit it to an external display device.

[0025] It is worth noting that the linearly polarized light modulated by the leakage magnetic field can be used to reflect the defects of the device under test; therefore, by analyzing the external electrical signal, the specific defects of the device under test can be finally determined.

[0026] On the other hand, the present invention also provides a method for self-adjusting parameters of a magneto-optical imaging integrated probe, such as Figure 3 As shown, the parameter self-adjustment method of the magneto-optical imaging integrated probe specifically includes the following steps: Step 1: Obtain the maximum leakage magnetic field intensity at the defect of the test piece.

[0027] As a more preferred embodiment of the present invention, the step 1 can be specifically described as follows: Place the magneto-optical imaging integrated probe just above the defect of the test piece to stimulate the leakage magnetic field; Use a Tesla meter to measure the maximum leakage magnetic field intensity B at the defect of the test piece.

[0028] Step 2: Construct a three-dimensional simulation model of the magneto-optical imaging integrated probe; On the basis of completing step 1, a three-dimensional simulation model of the magneto-optical imaging integrated probe is further constructed. As a preferred embodiment of the present invention, the specific description of step 2 can be referred to as follows: Use COMSOL model builder, select the specific three-dimensional space dimension and the interface of optical physics field to construct a three-dimensional simulation model of magneto-optical imaging integrated probe. It is worth noting that the constructed three-dimensional simulation model at least includes the simulation of LED light source 1, polarizer 3, magneto-optical film 501, mirror coating 502, beam splitter 6, camera 10, analyzer 11, and simplified geometric structure of light-blocking surface. For details, please refer to Figure 4 shown.

[0029] Step 3: Set the optical physics field for each geometric structure of the three-dimensional simulation model constructed in step 2.

[0030] On the basis of completing step 2, the optical physical field of each part of the geometric structure of the three-dimensional simulation model is further set. As a preferred embodiment of the present invention, step 3 mainly sets the optical physical field of the geometric structure of the LED light source 1, the polarizer 3, the magneto-optical film 501, and the analyzer 11, and the beam splitter 6, the camera 10 and the light-blocking surface are simplified.

[0031] First, the LED light source 1 is set to emit uniform non-polarized light based on the grid unit, and its light source power is set to W. Then the output light intensity I0 satisfies: (1); In formula (1), l and b are the length and width of the light-emitting surface of the LED light source 1, respectively.

[0032] Specifically, according to the design selection of the aforementioned magneto-optical imaging integrated probe, that is, Therefore, formula (1) can be used to calculate the incident light intensity: .

[0033] Then, the polarizer 3, the magneto-optical film 501 and the analyzer 11 are set as a linear polarizing plate.

[0034] Wherein, the transmission axis of the polarizer 3 is defined as: (2) ; In formula (2), v p is the direction vector of the transmission axis of polarizer 3, v px , v py and v pz They are v p The projection on the x-axis, y-axis and z-axis, c p is a constant, γ is v p The angle with the horizontal direction; after the parallel light passes through the polarizer 3, its light intensity becomes I0 / 2.

[0035] The deflection angle θ of the linear polarized light when passing through the magneto-optical film 501 satisfies: (3) ; In formula (3), V is the Verdet constant, and T is the thickness of the magneto-optical film 501.

[0036] It is necessary to add that, since the transmission axis of the polarizer 3 is arranged in the horizontal direction, , so the direction vector obtained by equation (2) is , and the rotation angle of formula (3) satisfies , where B is the maximum leakage magnetic field intensity at the defect of the test piece measured by the Tesla meter in step 1.

[0037] The transmission axis of the magneto-optical film 501 is defined as: (4) ; In formula (4), vm is the direction vector of the transmission axis of the magneto-optical film 501, v mx , v my and v mz They are v m The projection on the x-axis, y-axis and z-axis, c m is a constant.

[0038] Substituting the above calculated values, the direction vector calculated by equation 4 is .

[0039] The transmission axis of the analyzer 11 is defined as: (5) ; In formula (5), v d is the direction vector of the transmission axis of the polarizer 11, v dx , v dy and v dz They are v d The projection on the x-axis, y-axis and z-axis, c d is a constant.

[0040] Substituting the above calculated values ​​into the equation (5), the direction vector is: .

[0041] Furthermore, the reflectivity of the beam splitter 6 is set to r, the transmittance is set to 1-r, and the reflection coefficient of the mirror coating 502 is set to 1. Then, after the linearly polarized light passes through the analyzer 11, its light intensity I D ,satisfy: (6).

[0042] Substituting the above calculated values, we can obtain that the light intensity calculated by formula (6) satisfies: .

[0043] Finally, the wall condition of the light-blocking surface is set to disappear to delete the redundant light reflected and transmitted by the beam splitter 6 (to save computing power). Then, the wall condition of the camera 10 is set to freeze, thereby ensuring that the camera 10 can capture and save the position and light intensity information of the corresponding linearly polarized light.

[0044] Step 4: Perform differentiated meshing on the three-dimensional simulation model processed in step 3.

[0045] On the basis of completing step 3, the three-dimensional simulation model is further divided into differentiated grids. Specifically, in order to ensure the accuracy of the simulation and make the calculation process run faster, for the light source 1, magneto-optical film 501 and camera 10, which have high requirements for calculation accuracy, smaller cells are set (for example, the grid cell side length of the cell is set to 0.01mm); for other structures with low requirements for calculation accuracy, relatively larger unit grids can be set (for example, the grid cell side length of the cell is set to 0.05mm).

[0046] Step 5: Set scanning parameters for the three-dimensional simulation model processed in step 4, calculate the values ​​of various variables in the three-dimensional simulation model; and draw a simulated magneto-optical image.

[0047] On the basis of completing step 4, the three-dimensional simulation model is further calculated and solved to draw the simulated magneto-optical image. It is worth noting that in order to solve the variables W, α, and r that have an important influence on the imaging effect, the scanning parameters of the three-dimensional simulation model are first set to assign values ​​to the above variables.

[0048] Specific variables that satisfy: (7); Among them, range is the name of COMSOL built-in function, i W 、s W 、f W are the initial value, step size and final value of the variable W, respectively. α 、s α 、f α are the initial value, step size and final value of variable α respectively, i r 、s r 、f r are the initial value, step size and final value of the variable r. Substituting the above three variables into formula (6) and calling the solver of the three-dimensional simulation model for calculation, the simulated magneto-optical image of the camera 10 can be drawn when W, α and r take corresponding values.

[0049] Furthermore, the present invention provides a method for self-adjusting parameters of a magneto-optical imaging integrated probe, which further includes the following steps: Step six: Analyze the simulated magneto-optical image obtained in step five to determine the optimal value of each variable in the three-dimensional simulation model.

[0050] On the basis of completing step 5, the simulated magneto-optical image is further analyzed. As a preferred embodiment of the present invention, step 6 is specifically described as follows: First, calculate the average grayscale of the simulated magneto-optical image , the maximum gray value of the simulated magneto-optical image and the minimum gray value of the simulated magneto-optical image .

[0051] Among them, the average grayscale of the simulated magneto-optical image ,satisfy: (8) ; In formula (8), M and N represent the height and width of the simulated magneto-optical image, respectively. Represents pixel Gray value of Maximum grayscale value of simulated magneto-optical image ,satisfy: (9) ; Minimum gray value of simulated magneto-optical image ,satisfy: (10) .

[0052] Then, construct the evaluation function ; Among them, the evaluation function ,satisfy: (11). Calculate the E value under different variable conditions. When the E value is the largest, the corresponding value of each variable in the three-dimensional simulation model is the optimal value (when each variable value takes the optimal value, the detection effect of the magneto-optical imaging integrated probe is the best).

[0053] The present invention provides a magneto-optical imaging integrated probe and a parameter self-adjustment method thereof, wherein the parameter self-adjustment method comprises the following steps: step one: obtaining the maximum leakage magnetic field intensity at the defect of the test piece; step two: constructing a three-dimensional simulation model of the magneto-optical imaging integrated probe; step three: performing optical physical field settings on the geometric structures of each part of the three-dimensional simulation model constructed in step two; step four: performing differential grid division on the three-dimensional simulation model processed in step three; step five: performing scanning parameter settings on the three-dimensional simulation model processed in step four, calculating the values ​​of each variable in the three-dimensional simulation model; and drawing a simulated magneto-optical image.

[0054] The magneto-optical imaging integrated probe and its parameter self-adjustment method with the above technical features have higher defect imaging clarity and equipment integrated layout by configuring a vertical "cast-collect" optical path and a smaller sensor gap; at the same time, the present invention also provides a probe parameter self-adjustment method that can adapt to the detection needs of diverse working conditions. Compared with the prior art, the technical solution of the present invention has at least the following technical advantages: (1) The device structure has a higher degree of integration and less defocusing, which can effectively improve the clarity of defect detection imaging; (2) It makes up for the deficiency of experience-based parameter adjustment in the existing technology and enhances the applicability of the magneto-optical imaging integrated probe, enabling it to adapt to different working conditions through precise parameter adjustment.

[0055] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A magneto-optical imaging integrated probe, characterized in that: The magneto-optical imaging integrated probe is composed of a linearly polarized light emitting unit, a linearly polarized light modulation unit, a linearly polarized light imaging unit and a clamping mechanism; The clamping mechanism is composed of an inner shell (7) and an outer shell (14); wherein a linear polarized light path is provided between the inner shell (7) and the outer shell (14); The linearly polarized light emitting unit comprises an LED light source (1), a light guide plate (2) and a polarizer (3); wherein the LED light source (1) is fixedly mounted on the side wall of an inner shell (7); the light guide plate (2) is fixedly mounted inside the inner shell (7) and is used to modulate the light output by the LED light source (1) into parallel light in a horizontal direction; the polarizer (3) is fixedly mounted inside the inner shell (7) and is arranged perpendicular to the direction of the parallel light and is used to modulate the parallel light into linearly polarized light; The linear polarization light modulation unit comprises a magneto-optical sensor module (5), a beam splitter (6), a silicon steel yoke (8) and a neodymium iron boron magnet (9); wherein the magneto-optical sensor module (5) is fixedly installed inside an inner shell (7) directly below the linear polarization light path; the beam splitter (6) is fixedly installed inside the inner shell (7) and is used to reflect the linear polarization light modulated by the polarizer (3) to the position of the magneto-optical sensor module (5); the neodymium iron boron magnet (9) and the silicon steel yoke (8) are sequentially arranged and installed on the periphery of the linear polarization light path to form a closed magnetic field loop; The linear polarized light imaging unit comprises a camera (10), an analyzer (11), a camera driving board (12) and a Lemo connector (13); wherein the analyzer (11) is fixedly mounted on the top of an outer shell (14) directly above the linear polarized light path, and is used to receive linear polarized light modulated by a leakage magnetic field; the camera (10), the camera driving board (12) and the Lemo connector (13) are sequentially connected to the analyzer (11), and are used to convert the optical signal captured by the analyzer (11) into an electrical signal, and transmit the electrical signal to an external display device.

2. The magneto-optical imaging integrated probe according to claim 1, characterized in that: The magneto-optical sensing module (5) is composed of a magneto-optical film (501), a mirror coating (502) and a protective coating (503); wherein the magneto-optical film (501) is used to induce linearly polarized light to produce a magneto-optical rotation effect, the mirror coating (502) is used to reflect the linearly polarized light, and the protective coating (503) is used to protect the magneto-optical film (501) and the mirror coating (502).

3. A method for self-adjusting parameters of a magneto-optical imaging integrated probe, characterized in that: The magneto-optical imaging integrated probe according to any one of claims 1 or 2 comprises the following steps: Step 1: Obtain the maximum leakage magnetic field intensity at the defect of the test piece; The step 1 is specifically described as: Place the magneto-optical imaging integrated probe just above the defect of the test piece to stimulate the leakage magnetic field; Use a Tesla meter to measure the maximum leakage magnetic field intensity B at the defect of the test piece; Step 2: Construct a three-dimensional simulation model of the magneto-optical imaging integrated probe; Step 3: Setting the optical physical field for each geometric structure of the three-dimensional simulation model constructed in step 2; Step 4: Perform differential meshing on the three-dimensional simulation model processed in step 3; Step 5: Set scanning parameters for the three-dimensional simulation model processed in step 4, calculate the values ​​of various variables in the three-dimensional simulation model; and draw a simulated magneto-optical image.

4. The method for self-adjusting parameters of a magneto-optical imaging integrated probe according to claim 3, characterized in that: It also includes the following steps: Step six: Analyze the simulated magneto-optical image obtained in step five to determine the optimal value of each variable in the three-dimensional simulation model.

5. The method for self-adjusting parameters of a magneto-optical imaging integrated probe according to claim 3, characterized in that: The step 2 is specifically described as: A three-dimensional simulation model of a magneto-optical imaging integrated probe is constructed using a COMSOL model developer; wherein the constructed three-dimensional simulation model at least includes simulations of an LED light source (1), a polarizer (3), a magneto-optical film (501), a mirror coating (502), a beam splitter (6), a camera (10), an analyzer (11), and a simplified geometric structure of a light-blocking surface.

6. The method for self-adjusting parameters of a magneto-optical imaging integrated probe according to claim 3, characterized in that: The step three is specifically described as: The LED light source (1) is set to emit uniform non-polarized light based on the grid unit, and its light source power is set to W. Then the output light intensity I0 satisfies: (1) ; In the formula (1), l and b are respectively the length and width of the light-emitting surface of the LED light source (1); The polarizer (3), the magneto-optical film (501) and the analyzer (11) are set as linear polarizers, and the transmission axis of the polarizer (3) is defined as: (2) ; In formula (2), v p is the direction vector of the transmission axis of the polarizer (3), v px , v py and v pz They are v p The projection on the x-axis, y-axis and z-axis, c p is a constant, γ is v p The angle with the horizontal direction; after the parallel light passes through the polarizer (3), its light intensity becomes I0 / 2; The deflection angle θ of the linearly polarized light when passing through the magneto-optical film (501) satisfies: (3) ; In the formula (3), V is the Verdet constant, T is the thickness of the magneto-optical film (501); The transmission axis of the magneto-optical film (501) is defined as: (4) ; In formula (4), v m is the direction vector of the transmission axis of the magneto-optical film (501), v mx , v my and v mz They are v m The projection on the x-axis, y-axis and z-axis, c m is a constant; The transmission axis of the polarizer (11) is defined as: (5) ; In formula (5), v d is the direction vector of the transmission axis of the polarizer (11), v dx , v dy and v dz They are v d The projection on the x-axis, y-axis and z-axis, c d is a constant; The reflectivity of the beam splitter (6) is set to r, the transmittance is set to 1-r, and the reflection coefficient of the mirror coating (502) is set to 1. Then, after the linearly polarized light passes through the analyzer (11), its light intensity I D ,satisfy: （6）。 7. The method for self-adjusting parameters of a magneto-optical imaging integrated probe according to claim 4, characterized in that: The step six is ​​specifically described as: Calculate the average grayscale of simulated magneto-optical images , the maximum gray value of the simulated magneto-optical image and the minimum gray value of the simulated magneto-optical image ; Among them, the average grayscale of the simulated magneto-optical image ,satisfy: (8) ; In formula (8), M and N represent the height and width of the simulated magneto-optical image, respectively. Represents pixel Gray value of Maximum grayscale value of simulated magneto-optical image ,satisfy: (9) ; Minimum gray value of simulated magneto-optical image ,satisfy: (10) ; Constructing the evaluation function ; Among them, the evaluation function ,satisfy: (11) ; Calculate the E value under different variable conditions; when the E value is the largest, the corresponding value of each variable in the three-dimensional simulation model is the optimal value.

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