Neutron imaging equipment and imaging method thereof

Abstract

The invention discloses neutron imaging equipment, which relates to the technical field of multi-modal imaging and comprises a neutron imaging instrument, an infrared imaging instrument and a loading component. Through the integrated design of a neutron imaging instrument and an infrared imaging instrument, infrared thermal excitation detection is introduced as a complementary means, the surface of a sample can be subjected to active thermal excitation through a light source assembly, and the infrared imaging instrument can accurately capture the surface heat flow change generated by the active thermal excitation; when pores and cracks exist in a sample or light element materials are not uniformly distributed, the heat conduction characteristic of the sample can be changed, so that unique heat characteristics are formed in an infrared image, and the surface heat information is obtained through cooperative work of the light source assembly and the infrared imaging instrument. And by fusing with the internal structure information obtained by the neutron imaging instrument in the control box, the internal structure and defect of the light element material, which are difficult to distinguish by simply relying on neutron imaging, can be indirectly revealed, and the sensitivity and reliability of detection are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-modal imaging, in particular to a neutron imaging device and an imaging method thereof. BACKGROUND

[0002] As a core non-destructive testing method, neutron imaging technology has been widely used in industrial detection, material science and scientific research due to its penetration ability for various metal materials and complex structures, and its irreplaceable advantages in material internal defect detection, fluid distribution characterization and element composition analysis.

[0003] However, the existing neutron imaging technology still has significant limitations in practical application. Its spatial resolution, detection sensitivity and imaging real-time performance have not met the high-precision detection requirements. Especially for non-destructive testing of samples containing light elements, it is often difficult to obtain clear internal structure information due to the weak effect of light elements on neutrons, which limits the further promotion of this technology in related fields. SUMMARY

[0004] The present application provides a neutron imaging device and an imaging method thereof, which can solve the problem that the spatial resolution, detection sensitivity and imaging real-time performance of the existing technology have not met the high-precision detection requirements. Especially for non-destructive testing of samples containing light elements, it is often difficult to obtain clear internal structure information due to the weak effect of light elements on neutrons.

[0005] A neutron imaging device, comprising a neutron imaging instrument, an infrared imaging instrument and a sample carrier assembly, the neutron imaging instrument is installed on a first adjusting mechanism, the infrared imaging instrument is installed on a second adjusting mechanism, the sample carrier assembly is installed on a third adjusting mechanism, the first adjusting mechanism and the third adjusting mechanism are both installed on a bottom plate, and the second adjusting mechanism is installed on a moving assembly; the infrared imaging instrument is provided with a light source assembly connected with the second adjusting mechanism on one side; and the first adjusting mechanism is provided with a control box on one side.

[0006] The neutron imaging device provided by the present application has the following beneficial effects compared with the prior art, but is not limited to the following: The neutron imaging equipment is integrally designed by the neutron imaging instrument and the infrared imaging instrument, introduces infrared thermal excitation detection as a complementary means, can actively heat excite the sample surface through the light source assembly, and the infrared imaging instrument can accurately capture the surface heat flow changes generated thereby, when the sample has internal structures such as pores, cracks or uneven distribution of light element materials, the heat conduction characteristics will change, thereby forming unique thermal characteristics in the infrared image, the surface heat information obtained by the light source assembly and the infrared imaging instrument cooperates with the internal structure information obtained by the neutron imaging instrument in the control box, can indirectly reveal the internal structure and defects of the light element material which is difficult to distinguish by relying on the neutron imaging alone, significantly improves the sensitivity and reliability of the detection, and effectively overcomes the inherent limitations of the prior art.

[0007] Further, the sample carrying assembly comprises a sample carrying table and a base, and a rotating assembly is mounted on the base, and the rotating assembly is connected to the sample carrying table through a connecting rod at the top.

[0008] Further, the first adjusting mechanism comprises a moving frame, a lifting assembly and a limiting plate, the limiting plate is connected to the bottom plate, the moving frame is connected with a roller matched with the limiting plate at the bottom, the lifting assembly is connected to the moving frame, and a first lifting plate is connected to one side of the lifting assembly, and the neutron imaging instrument is connected to the first lifting plate.

[0009] Further, the second adjusting mechanism comprises a first horizontal moving module and a vertical moving module, the horizontal moving module is connected to the moving assembly, the vertical moving module is connected to the horizontal moving module, a second lifting plate is connected to one side of the vertical moving module, the second horizontal moving module is mounted on the second lifting plate, and the infrared imaging instrument is mounted on the second horizontal moving module.

[0010] Further, the third adjusting mechanism comprises a horizontal screw, one end of the horizontal screw is connected with a horizontal motor, a second driving block is connected to the horizontal screw, and the second driving block is connected to the sample carrying assembly at the top.

[0011] Further, the moving assembly comprises a moving trolley, and a control panel is arranged on the moving trolley.

[0012] Further, the light source assembly comprises a mounting plate and a rotating plate, one side of the mounting plate is connected with the second adjusting mechanism, the rotating plate is mounted at both ends of the mounting plate through a rotating piece, a halogen lamp is mounted at one end of the rotating plate, and a flash lamp is mounted at the other end of the rotating plate.

[0013] Furthermore, the rotating assembly includes a base frame and a rotating disk. A drive gear is connected inside the base frame via a bearing seat. The drive gear is connected to a worm gear via a transmission gear. The worm gear is connected to the drive end of a drive motor. The drive gear is connected to the bottom of the rotating disk.

[0014] Furthermore, the lifting assembly includes a lifting screw, which is connected to the movable frame via a bearing seat. One end of the lifting screw is connected to a lifting motor, and a first drive block is connected to the lifting screw. The first drive block is connected to a first lifting plate.

[0015] A neutron imaging device method includes the following steps: S1, fixing the sample to be tested on a carrier component; S2, adjusting the position and height of the neutron imaging instrument through a first adjustment mechanism, and coordinating the spatial positions of the infrared imaging instrument and the light source component through a moving component and a second adjustment mechanism, so that the optical axes of the neutron imaging instrument and the infrared imaging instrument are aligned with the sample and in a preset imaging relative position; S3, driving the carrier component to move to the neutron imaging station through a third adjustment mechanism to acquire neutron images; S4, rotating the sample through the carrier component to switch the sample to the infrared imaging station, and using the light source component to thermally excite the sample, while simultaneously acquiring infrared images of the sample through the infrared imaging instrument; S5, transmitting the acquired neutron image and infrared image to a processing unit in a control box, and fusing the two types of images based on a wavelet transform algorithm to obtain a fused image that simultaneously contains information about the sample's internal structure and surface thermal distribution. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a neutron imaging device according to an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of the medium-load assembly; Figure 3 for Figure 1 A schematic diagram of the structure of the China Mobile component; Figure 4 for Figure 1 A schematic diagram of the structure of the first regulating mechanism; Figure 5 for Figure 1 A schematic diagram of the structure of the second regulating mechanism; Figure 6 for Figure 1 A schematic diagram of the structure of the light source component; Figure 7 for Figure 1 A schematic diagram of the structure of the third regulating mechanism; Figure 8 for Figure 2 A schematic diagram of the rotating assembly.

[0017] Explanation of reference signs: 1, neutron imaging instrument; 2, infrared imaging instrument; 3, carrying assembly; 4, first adjusting mechanism; 5, second adjusting mechanism; 6, third adjusting mechanism; 7, bottom plate; 8, moving assembly; 9, light source assembly; 10, control box; 31, carrying table; 32, base; 33, rotating assembly; 34, connecting rod; 41, moving frame; 42, lifting assembly; 43, limiting plate; 44, roller; 45, first lifting plate; 51, first horizontal moving module; 52, vertical moving module; 53, second lifting plate; 54, second horizontal moving module; 61, horizontal screw rod; 62, horizontal motor; 63, second driving block; 81, moving trolley; 82, control panel; 91, mounting plate; 92, rotating plate; 93, rotating piece; 94, halogen lamp; 95, flash lamp; 331, bottom frame; 332, rotating disc; 333, driving gear; 334, transmission gear; 335, worm; 336, driving motor; 421, lifting screw rod; 422, lifting motor; 423, first driving block. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings which show the embodiments according to the present application. It should be understood that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort shall fall within the scope of protection of the present application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms used in disclosing the application, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms used in the description of the present application are used for illustrative purposes only and are not intended to limit the scope of the application. The terms "comprise", "comprising", "include", "including", "have" and "having" are used in the specification to mean "including but not limited to". The terms "comprise", "comprising", "include", "including", "have" and "having" are used in the specification to mean "including but not limited to". The terms "first", "second", and the like, as used in the description of the application, do not connote any order, quantity, or importance, but rather are used to distinguish one element from another. In addition, the terms "first" and "second" are used only for descriptive purposes and do not connote or imply any relative importance or any fixed number of the indicated elements. Thus, a feature defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality" is two or more, unless otherwise specified.

[0020] In the description of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0021] In the description of the application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0022] It should be emphasized that when the term "comprise / contain" is used in the specification, it is used to explicitly indicate the presence of the features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps, components or groups of features, integers, steps, components.

[0023] The term "and / or" in the present application is only used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0024] As shown in Figures 1-3 The neutron imaging device provided by the embodiment of the present application comprises a neutron imaging instrument 1, an infrared imaging instrument 2, and a carrier assembly 3. The neutron imaging instrument 1 is installed on a first adjusting mechanism 4. The infrared imaging instrument 2 is installed on a second adjusting mechanism 5. The carrier assembly 3 is installed on a third adjusting mechanism 6. The first adjusting mechanism 4 and the third adjusting mechanism 6 are both installed on a bottom plate 7. The second adjusting mechanism 5 is installed on a moving assembly 8. The infrared imaging instrument 2 is provided with a light source assembly 9 connected with the second adjusting mechanism 5 on one side. The first adjusting mechanism 4 is provided with a control box 10 on one side.

[0025] In the embodiment, the integration design of the neutron imaging instrument 1 and the infrared imaging instrument 2 introduces infrared thermal excitation detection as a complementary means. The light source assembly 9 can actively heat excite the sample surface. The infrared imaging instrument 2 can accurately capture the surface heat flow changes caused thereby. When there are pores, cracks, or uneven distribution of light element materials in the sample, the heat conduction characteristics will change, thereby forming unique thermal characteristics in the infrared image. The surface heat information obtained by the cooperation of the light source assembly 9 and the infrared imaging instrument 2 and the internal structure information obtained by the neutron imaging instrument 1 are fused in the control box 10, which can indirectly reveal the internal structure and defects of light element materials that are difficult to distinguish by relying on neutron imaging alone, significantly improve the sensitivity and reliability of detection, and effectively overcome the inherent limitations of the prior art.

[0026] Specifically, by realizing efficient cooperation of neutron-infrared multi-modal imaging, the neutron imaging instrument 1 is installed on the bottom plate 7 through the first adjusting mechanism 4, and the object carrying assembly 3 is synchronously fixed on the bottom plate 7 through the third adjusting mechanism 6, and the two form a stable neutron imaging core station, ensuring the stability of the neutron beam transmission path and the accuracy of sample positioning; the infrared imaging instrument 2 is carried on the second adjusting mechanism 5 on the moving assembly 8, and can be flexibly adjusted in overall deployment position through the moving assembly 8, and then the three-dimensional screw rod transmission of the second adjusting mechanism 5 is realized to realize accurate alignment with the optical axis of the neutron imaging instrument 1, and the light source assembly 9 connected with the second adjusting mechanism 5 on one side can adapt to the sample position synchronously with the infrared imaging instrument 2 to provide targeted thermal excitation; the control box 10 on one side of the first adjusting mechanism 4 can centrally control the operation of the neutron imaging instrument 1, the infrared imaging instrument 2, the object carrying assembly 3 and each adjusting mechanism and the light source assembly 9. This layout not only ensures the stability of the neutron imaging core components through the fixed installation of the bottom plate 7, but also gives the infrared imaging module flexible adaptability with the help of the moving assembly 8, and at the same time, the nearby arrangement of the control box 10 simplifies the wiring management and operation process, realizes the cooperative control of multi-modal imaging, and greatly improves the convenience of experimental operation, the accuracy of imaging alignment and the safety of equipment operation.

[0027] As shown in Figure 1 and Figure 2 , the object carrying assembly 3 includes an object carrying table 31 and a base 32, and a rotating assembly 33 is installed on the base 32, and the top of the rotating assembly 33 is connected with the object carrying table 31 through a connecting rod 34.

[0028] In this embodiment, the object carrying table 31 provides a flat and stable bearing surface for the sample to be measured, ensuring that the sample does not move during the whole process of neutron imaging and infrared imaging, and ensuring the consistency of the imaging data.

[0029] Specifically, the rotating assembly 33 can drive the object carrying table 31 to rotate flexibly and accurately by 360°, perfectly adapting to the structural requirement that the neutron imaging instrument 1 and the infrared imaging instrument 2 are arranged at 90°, and only a 90° accurate angle is needed to complete the switching of the sample from the neutron imaging station to the infrared imaging station, without the need to disassemble or move the sample, completely avoiding the error caused by secondary positioning.

[0030] As shown in Figure 1 and Figure 4 , the first adjusting mechanism 4 includes a moving frame 41, a lifting assembly 42 and a limiting plate 43, the limiting plate 43 is connected to the bottom plate 7, the moving frame 41 is connected at the bottom with a roller 44 matched with the limiting plate 43, the lifting assembly 42 is connected to the moving frame 41, and the lifting assembly 42 is connected with a first lifting plate 45 on one side, and the neutron imaging instrument 1 is connected to the first lifting plate 45.

[0031] In the embodiment, the lifting assembly 42 is assembled on the moving frame 41, and the lifting power is accurately transmitted to the neutron imaging instrument 1 through the connection with the first lifting plate 45, so that the height of the instrument is flexibly adjusted, different sample heights and experimental station requirements are adapted, the cooperation of the lifting assembly 42 and the first lifting plate 45 makes the height adjustment more stable and accurate, and combined with the smooth movement in the horizontal direction, the neutron imaging instrument 1 can quickly complete the alignment and calibration with the sample carrying assembly 3 and the infrared imaging instrument 2, and the adjustment difficulty and positioning error are significantly reduced.

[0032] Specifically, the limiting plate 43 provides a precise guide reference for the horizontal movement of the moving frame 41, and forms a matching cooperation with the roller 44 at the bottom of the moving frame 41, which not only reduces the friction resistance in the movement process, makes the horizontal position adjustment of the neutron imaging instrument 1 more smooth and labor-saving, but also can limit the movement trajectory to avoid deviation, and ensure the straightness and positioning accuracy of the horizontal adjustment.

[0033] As shown in Figure 2 and Figure 5 , the second adjusting mechanism 5 includes a first horizontal moving module 51 and a vertical moving module 52, the first horizontal moving module 51 is connected to the moving assembly 8, and the vertical moving module 52 is connected to the first horizontal moving module 51. The vertical moving module 52 is connected with a second lifting plate 53 on one side, and the second horizontal moving module 54 is installed on the second lifting plate 53. The infrared imaging instrument 2 is installed on the second horizontal moving module 54.

[0034] In the embodiment, the first horizontal moving module 51 is connected to the moving assembly 8 to provide the infrared imaging instrument 2 with horizontal displacement adjustment in the first dimension, which can quickly adapt to the horizontal position of the sample carrying assembly 3 as a basic adjusting unit, and lay a foundation for subsequent accurate alignment; the vertical moving module 52 is connected to the first horizontal moving module 51, which can drive the whole structure to realize vertical lifting, accurately adjust the height of the infrared imaging instrument 2, and meet the horizontal alignment requirement with the sample table of the neutron imaging device; the second lifting plate 53 provides a flat and reliable installation reference for the second horizontal moving module 54, and the second horizontal moving module 54 provides the infrared imaging instrument 2 with horizontal fine adjustment in the second dimension, which can accurately compensate the adjustment error of the first horizontal moving module 51, cooperate with the angle adjustment of the camera holder, realize the accurate alignment of the optical axis of the infrared imaging instrument 2 and the optical axis of the neutron imaging instrument 1, and ensure that they are in the same horizontal plane and perpendicular to the neutron beam direction.

[0035] Specifically, the first horizontal moving module 51, the vertical moving module 52 and the second horizontal moving module 54 all adopt a lead screw transmission module.

[0036] As shown in Figure 1 and Figure 7As shown, the third adjusting mechanism 6 comprises a horizontal screw 61 connected with a horizontal motor 62 at one end, and a second driving block 63 connected with the horizontal screw 61, and the top of the second driving block 63 is connected with the object carrying assembly 3.

[0037] In the embodiment, the horizontal screw 61 can convert the rotating power of the horizontal motor 62 into the linear displacement of the object carrying assembly 3, and can drive the second driving block 63 and the object carrying assembly 3 to move smoothly in the horizontal direction, so as to realize the automatic and accurate adjustment of the object carrying assembly 3, reduce the operation strength of the experimental personnel, and avoid the human error caused by manual adjustment.

[0038] As shown in Figure 1 and Figure 3 The moving assembly 8 comprises a moving trolley 81 provided with a control panel 82. By integrating the second adjusting mechanism 5 and the infrared imaging unit on the moving trolley 81, the entire infrared imaging system becomes an independent and flexible moving module, so that the device does not need to be fixedly installed, and can be quickly deployed to the best working position beside the neutron imaging device according to the experimental requirements, and can be conveniently moved out during the non-use period, which greatly improves the spatial adaptability and use flexibility of the system. At the same time, the control panel 82 is integrated on the moving trolley 81, the motion control, light source excitation and image acquisition and other core operation functions of the infrared imaging unit are concentrated here, which provides a unified local control terminal for the experimental personnel, realizes the centralization and convenience of the operation process, effectively avoids the frequent back and forth between the radiation environment and the main control device, and significantly improves the experimental efficiency under the premise of ensuring the safety of personnel.

[0039] As shown in Figure 3 and Figure 6 The light source assembly 9 comprises a mounting plate 91 and a rotating plate 92, the mounting plate 91 is connected with the second adjusting mechanism 5 at one side, the rotating plate 92 is installed at both ends of the mounting plate 91 through a rotating piece 93, a halogen lamp 94 is installed at one end of the rotating plate 92, and a flash lamp 95 is installed at the other end of the rotating plate 92.

[0040] In this embodiment, the light source assembly 9 is stably connected to the second adjusting mechanism 5 on one side of the mounting plate 91, ensuring that the light source assembly 9 can be adjusted in three-dimensional space synchronously with the infrared imaging instrument 2, and always maintain an appropriate excitation distance with the sample; the rotating plate 92 is installed at both ends of the mounting plate 91 through the rotating member 93, forming a symmetrical double-lamp group layout, which can be flexibly rotated around the rotating member 93, supporting one-key 180° switching driven by the motor, and can also be manually adjusted in small angles, which can quickly adapt to the excitation requirements of different detection surfaces of the sample, and realize omnidirectional and dead-angle-free thermal irradiation; the halogen lamp 94 at one end of the rotating plate 92 can provide continuous and stable infrared radiation, meeting the detection scene of uniform heating of the sample surface, and the flash lamp 95 at the other end can release high-energy pulses to realize instantaneous thermal excitation, and the two light sources can be independently controlled or work cooperatively, perfectly adapting to the thermal response requirements of samples with different characteristics such as light element materials, and enhancing the contrast of infrared images; the overall structure is integrated through the integrated installation of the mounting plate 91, the flexible adjustment of the rotating plate 92 and the rotating member 93, and the complementary functions of the halogen lamp 94 and the flash lamp 95, which not only ensures the accuracy and stability of thermal excitation, but also provides convenience for light source switching, providing reliable thermal excitation protection for the infrared imaging instrument 2 to obtain high-definition temperature field distribution images, and at the same time adapting to the cooperative requirements of neutron-infrared synchronous imaging.

[0041] As shown in Figure 2 and Figure 8 , the rotating assembly 33 includes a bottom frame 331 and a rotating disc 332, the inside of the bottom frame 331 is connected with a drive gear 333 through a bearing seat, the drive gear 333 is connected with a worm 335 through a transmission gear 334, the worm 335 is connected with a drive motor 336 at the driving end, and the drive gear 333 is connected with the bottom of the rotating disc 332.

[0042] In this embodiment, the bearing seat provides a stable installation and positioning reference for the drive gear 333, effectively limiting the radial and axial displacement of the transmission components, and the drive motor 336 provides a stable and controllable power source for the rotating action, cooperating with the multi-stage gear transmission structure composed of the worm 335, the transmission gear 334 and the drive gear 333, which not only realizes smooth transmission of power, but also utilizes the self-locking characteristics of the worm transmission and the high-precision advantages of the gear transmission, ensuring accurate control of the rotating angle, which can meet the experimental requirements of 90° accurate angle switching and 360° flexible rotation of the sample.

[0043] Specifically, the drive gear 333 is directly connected with the bottom of the rotating disc 332, which can accurately transmit the transmission power to the rotating disc 332, ensuring the coaxiality and stability of the rotating disc 332 during rotation, avoiding the sample from shifting or shaking during rotation, and further ensuring the consistency of the detection surface of neutron imaging and infrared imaging, completely eliminating the imaging error caused by secondary positioning.

[0044] As shown in Figure 2 andFigure 4 As shown, the lifting assembly 42 includes a lifting screw 421 connected to the moving frame 41 through a bearing block, one end of the lifting screw 421 is connected with a lifting motor 422, and the lifting screw 421 is connected with a first driving block 423, and the first driving block 423 is connected with the first lifting plate 45.

[0045] In the embodiment, the lifting screw 421 is driven to rotate by the lifting motor 422, and the first driving block 423 can realize fine adjustment of the height of the neutron imaging instrument 1, and accurately adapt to different sample heights and the requirement of alignment of the optical axis with the infrared imaging instrument 2. The first driving block 423 is in threaded transmission cooperation with the lifting screw 421, the rotational power of the lifting motor 422 is converted into linear motion along the axial direction of the screw, and the threaded transmission has a self-locking function, so that the neutron imaging instrument 1 can be stably stopped at any height position, and accidental displacement is avoided.

[0046] A neutron imaging device method, comprising the following steps: S1, fixing a sample to be measured on a carrier assembly 3; S2, adjusting the position and height of the neutron imaging instrument 1 through the first adjusting mechanism 4, and adjusting the spatial position of the infrared imaging instrument 2 and the light source assembly 9 through the moving assembly 8 and the second adjusting mechanism 5, so that the optical axis of the neutron imaging instrument 1 and the optical axis of the infrared imaging instrument 2 are aligned with the sample and are in a preset imaging relative position; S3, driving the carrier assembly 3 to move to a neutron imaging station through the third adjusting mechanism 6, and collecting a neutron image; S4, rotating the sample by the carrier assembly 3, switching the sample to an infrared imaging station, and exciting the sample by the light source assembly 9, while collecting an infrared image of the sample by the infrared imaging instrument 2; S5, transmitting the collected neutron image and infrared image to a processing unit in a control box 10, and performing fusion processing on the two types of images based on a wavelet transform algorithm to obtain a fusion image containing both internal structure information and surface thermal distribution information of the sample.

[0047] In the embodiment, the sample to be tested is fixed on the sample stage 31 of the sample holder assembly 3, and the stable bearing of the sample stage 31 and the stable support of the base 32 ensure that the sample does not move during the subsequent movement, rotation and imaging process, laying the foundation for the consistency of image acquisition; the horizontal position and height of the neutron imaging instrument 1 are adjusted by the moving frame 41 and the lifting assembly 42 of the first adjusting mechanism 4, and the infrared imaging instrument 2 and the light source assembly 9 are adjusted by the three-dimensional screw rod transmission module of the moving assembly 8 and the second adjusting mechanism 5, so that the optical axes of the two instruments are accurately aligned with the sample and are in the preset relative position, solving the problem of multi-modal imaging alignment; the sample holder assembly 3 is accurately moved to the neutron imaging station by the horizontal screw 61 and the horizontal motor 62 of the third adjusting mechanism 6, and the high precision of screw transmission ensures the accurate alignment of the sample and the neutron imaging instrument 1, ensuring the clarity and accuracy of neutron image acquisition; the sample is accurately rotated by 90° to switch to the infrared imaging station by the rotating assembly 33 of the sample holder assembly 3, avoiding secondary positioning errors, and the halogen lamp 94 or the flash lamp 95 of the light source assembly 9 provides adaptive thermal excitation, which cooperates with the infrared imaging instrument 2 to acquire high-contrast surface thermal distribution images, realizing the cooperative adaptation of thermal excitation and imaging; the processing unit in the control box 10 performs wavelet transform fusion on the two types of images, fully combines the internal structure advantages of neutron images and the surface thermal feature advantages of infrared images, and obtains a fused image with complete information, which significantly improves the defect recognition rate and detection accuracy; the overall process relies on the function adaptation of each core structure to realize the automation and precision of sample positioning, station switching, image acquisition and fusion, greatly reducing manual operation errors, improving experimental efficiency, and perfectly adapting to the technical requirements of multi-modal non-destructive testing.

[0048] Specifically, the neutron image and the infrared image are subjected to multi-scale decomposition by wavelet transform. First, the two types of images are subjected to wavelet decomposition respectively to obtain low-frequency coefficients and high-frequency coefficients; then, according to the set fusion rule, the low-frequency coefficients are subjected to weighted average fusion to retain the overall structural information of the image; the high-frequency coefficients are selectively retained or subjected to maximum value fusion to enhance the edge and detail information of the image. Finally, the fused low-frequency coefficients and high-frequency coefficients are subjected to inverse wavelet transform to obtain the fused image, realizing the effective combination of neutron imaging information and infrared imaging information, thereby improving the recognizability and detection accuracy of the features of the sample to be tested. By fusing the neutron image and the infrared image, the advantages of the two types of imaging means can be fully utilized: the neutron image can reflect the internal structural information of the material, and the infrared image can reflect the surface temperature or thermal feature information. The fused image retains the key features of the two types of information, so that the internal structure and surface features of the sample to be tested can be completely presented in the same image, thereby improving the recognizability and detection accuracy of the imaging and obtaining more comprehensive and clearer imaging results than single imaging.

[0049] The above disclosed are only several specific embodiments of the present application, but the embodiments of the present application are not limited thereto, and any changes that can be thought of by any person skilled in the art shall fall into the protection scope of the present application.

Claims

1. A neutron imaging device, characterized by, Including neutron imaging instrument (1), infrared imaging instrument (2) and object assembly (3), the neutron imaging instrument (1) is installed on the first adjusting mechanism (4), the infrared imaging instrument (2) is installed on the second adjusting mechanism (5), the object assembly (3) is installed on the third adjusting mechanism (6), the first adjusting mechanism (4) and third adjusting mechanism (6) are installed on the bottom plate (7), the second adjusting mechanism (5) is installed on the moving assembly (8); The infrared imaging instrument (2) is provided with a light source assembly (9) connected with the second adjusting mechanism (5) on one side; The first adjusting mechanism (4) is provided with a control box (10) on one side.

2. The neutron imaging device of claim 1, wherein, The object assembly (3) includes a loading platform (31) and a base (32), the base (32) is provided with a rotating assembly (33), and the rotating assembly (33) is connected with the loading platform (31) through a connecting rod (34) at the top.

3. The neutron imaging apparatus of claim 1, wherein, The first adjusting mechanism (4) includes a moving frame (41), a lifting assembly (42) and a limiting plate (43), the limiting plate (43) is connected to the bottom plate (7), the moving frame (41) is connected with a roller (44) matched with the limiting plate (43) at the bottom, the lifting assembly (42) is connected to the moving frame (41), and the lifting assembly (42) is connected with a first lifting plate (45) on one side, and the neutron imaging instrument (1) is connected to the first lifting plate (45).

4. The neutron imaging apparatus of claim 1, wherein, The second adjusting mechanism (5) includes a first horizontal moving module (51) and a vertical moving module (52), the first horizontal moving module (51) is connected to the moving assembly (8), the vertical moving module (52) is connected to the first horizontal moving module (51), the vertical moving module (52) is connected with a second lifting plate (53) on one side, the second lifting plate (53) is provided with a second horizontal moving module (54), and the infrared imaging instrument (2) is installed on the second horizontal moving module (54).

5. The neutron imaging device of claim 1, wherein, The third adjusting mechanism (6) includes a horizontal screw rod (61), one end of the horizontal screw rod (61) is connected with a horizontal motor (62), the horizontal screw rod (61) is connected with a second driving block (63), and the second driving block (63) is connected with the object assembly (3) at the top.

6. The neutron imaging apparatus of claim 1, wherein, The moving assembly (8) includes a moving cart (81), and the moving cart (81) is provided with a control panel (82).

7. The neutron imaging device of claim 1, wherein, The light source assembly (9) includes a mounting plate (91) and a rotating plate (92), one side of the mounting plate (91) is connected with the second adjusting mechanism (5), the rotating plate (92) is installed at both ends of the mounting plate (91) through a rotating piece (93), one end of the rotating plate (92) is provided with a halogen lamp (94), and the other end of the rotating plate (92) is provided with a flash lamp (95).

8. The neutron imaging apparatus of claim 2, wherein, The rotating assembly (33) comprises a bottom frame (331) and a rotating disc (332), the inside of the bottom frame (331) is connected with a driving gear (333) through a bearing seat, the driving gear (333) is connected with a worm (335) through a transmission gear (334), the worm (335) is connected with the driving end of a driving motor (336), and the driving gear (333) is connected with the bottom of the rotating disc (332).

9. The neutron imaging apparatus of claim 3, wherein, The lifting assembly (42) comprises a lifting screw (421), the lifting screw (421) is connected on the moving frame (41) through a bearing seat, one end of the lifting screw (421) is connected with a lifting motor (422), the lifting screw (421) is connected with a first driving block (423), and the first driving block (423) is connected with the first lifting plate (45).

10. A method of a neutron imaging apparatus, characterized by, The method is applied to the neutron imaging device as claimed in any one of claims 1-9, and comprises the following steps: S1, fixing a sample to be measured on the sample carrier assembly (3); S2, adjusting the position and height of the neutron imaging instrument (1) through the first adjusting mechanism (4), and adjusting the spatial position of the infrared imaging instrument (2) and the light source assembly (9) through the moving assembly (8) and the second adjusting mechanism (5), so that the optical axis of the neutron imaging instrument (1) and the optical axis of the infrared imaging instrument (2) are aligned with the sample and are in a preset imaging relative position; S3, driving the sample carrier assembly (3) to move to the neutron imaging station through the third adjusting mechanism (6) to collect a neutron image; S4, rotating the sample carrier assembly (3) to switch the sample to the infrared imaging station, and exciting the sample through the light source assembly (9), and collecting an infrared image of the sample through the infrared imaging instrument (2); S5, transmitting the collected neutron image and infrared image to the processing unit in the control box (10), and performing fusion processing on the two types of images based on a wavelet transform algorithm to obtain a fusion image containing both the internal structure information and the surface thermal distribution information of the sample.

Images