Scattering imaging device and scattering imaging control system

Abstract

The invention discloses a scattering imaging device and a scattering imaging control system, and relates to the technical field of scattering imaging. In the scattering imaging device, a ray source is used for emitting ray beams; the first collimation structure comprises a first shielding cavity and a first through hole, the ray source is arranged in the first shielding cavity, and the first through hole is used for limiting the shape of a ray beam to form a first beam; the second collimation structure comprises a second shielding cavity and a second through hole, the first collimation structure is arranged in the second shielding cavity, and the second through hole is used for adjusting the shape of the first beam to form a second beam; the first collimation structure and the second collimation structure are respectively provided with a shielding layer, so that a ray beam which does not pass through the first through hole is shielded in the first shielding cavity. And the first beam which does not pass through the second through hole is shielded in the second shielding cavity. By applying the scattering imaging device disclosed by the invention, the structure of the scattering imaging device is simplified, the size is reduced, and the installation is convenient.

Description

Technical Field

[0001] The present application relates to but is not limited to the field of scatter imaging technology, and in particular to a scatter imaging device and a scatter imaging control system. Background Art

[0002] Scattering imaging is a type of radiation imaging technology. The radiation source emits radiation that sequentially irradiates each position of the object being inspected. The detector receives the scattering signal at the corresponding position and obtains the scattering image of the scanned object after electronic and computer processing.

[0003] In the related technology, the commonly used radiation source control devices are mainly based on the "flying spot" technology or its variants, wherein the radiation source is an X-ray machine, so it is necessary to additionally install a shielding body on the side, rear, and other positions of the radiation source mechanism; at the same time, the high-voltage, cooling and other systems supporting the X-ray machine radiation source are large in size, resulting in the overall device being complex, bulky, and having high operating and maintenance costs. Summary of the invention

[0004] In order to solve the above problems, the scattering imaging device provided in the present application simplifies the structure of the scattering imaging device, reduces the volume, and facilitates installation.

[0005] In a first aspect, the present application provides a scattering imaging device, which includes a ray source, a first collimating structure, and a second collimating structure. The ray source is used to emit a ray beam; the first collimating structure includes a first shielding cavity and a first through hole, the ray source is arranged in the first shielding cavity, and the first through hole is used to limit the shape of the ray beam to form a first beam; the second collimating structure includes a second shielding cavity and a second through hole, the first collimating structure is arranged in the second shielding cavity, and the second through hole is used to adjust the shape of the first beam to form a second beam; wherein the first collimating structure and the second collimating structure are both provided with a shielding layer to shield the ray beam that does not pass through the first through hole in the first shielding cavity; and shield the first beam that does not pass through the second through hole in the second shielding cavity.

[0006] The scattering imaging device provided by the present application, the ray source is arranged in the first shielding cavity of the first collimating structure, the first collimating structure also includes a first through hole, and part of the ray beam emitted by the ray source can be emitted from the first shielding cavity through the first through hole to form a first beam, and the shape of the first beam changes with the shape of the first through hole. Since the first collimating structure is arranged in the second shielding cavity of the second collimating structure, and the second collimating structure also includes a second through hole, the first beam can be emitted from the second shielding cavity through the second through hole to form a second beam, and at this time, the shape of the second beam changes with the shape of the second through hole. Since the first collimating structure and the second collimating structure are both provided with a shielding layer, the ray beam that does not pass through the first through hole and the second through hole can be shielded in the first shielding cavity and the second shielding cavity. That is, through the first collimating structure and the second collimating structure, the ray beam emitted by the ray source can form both the first beam and the second beam, and other ray beams can also be shielded in the first shielding cavity and the second shielding cavity. With such a structure, the shielding of the ray source, the shape formation of the ray beam and other functions can be integrated in the first collimating structure and the second collimating structure.

[0007] Compared with the complex component layout in the related art, the volume is reduced, and the structure of the scattering imaging device is simplified and optimized. In this way, not only space resources are saved, but also the mobility and deployment flexibility of the scattering imaging device are improved, so that the scattering imaging device can be more widely used in different scenes and environments. In addition, the scattering imaging device of the present application reduces the steps and time required during the assembly and configuration process, and reduces the difficulty and cost of installation. Operators can complete the deployment and debugging of the device more quickly, thereby improving work efficiency and overall performance.

[0008] In a possible implementation of the present application, the scattering imaging device also includes a bracket, the first collimation structure is mounted on the bracket, the second collimation structure is rotatably mounted on the bracket, and the second collimation structure can rotate relative to the first collimation structure so that a partial area of ​​the second through hole overlaps with the first through hole.

[0009] In a possible implementation of the present application, the scattering imaging device further includes a driving member, which is connected to the second collimating structure to drive the second collimating structure to rotate relative to the first collimating structure.

[0010] In a possible implementation of the present application, the scattering imaging device also includes an identification structure, which is arranged on the second collimation structure; a detector, configured to identify the identification structure to obtain a rotation parameter of the second collimation structure relative to the first collimation structure; and a controller, configured to control the radiation source and the driving member based on the rotation parameter.

[0011] In a possible implementation of the present application, the scattering imaging device also includes a movable rod, which can movably pass through the first collimation structure and be connected to the radiation source; the movable rod can drive the radiation source to move to a storage position and a working position relative to the first shielding cavity; when the radiation source is in the working position, the radiation source is aligned with the first through hole; when the radiation source is in the storage position, the radiation source is aligned with the shielding layer.

[0012] In a possible implementation of the present application, the first collimating structure is rotatably disposed on the bracket, and the first collimating structure rotates relative to the bracket to adjust the angle of the first through hole relative to the bracket.

[0013] In a possible implementation of the present application, the bracket includes a limit guide, which is arranged around the axis of the second collimation structure, and the second collimation structure is connected to the limit guide; the limit guide is used to provide a limit for the second collimation structure, and / or the second collimation structure can rotate along the limit guide.

[0014] In a possible implementation of the present application, the first through hole is arranged on the circumferential side of the first collimating structure, and the extension direction of the first through hole is parallel to the axial direction of the first collimating structure; the second through hole is arranged on the circumferential side of the second collimating structure, and there is an angle between the extension direction of the second through hole and the extension direction of the first through hole.

[0015] In a possible implementation of the present application, there are a plurality of second through holes, and the plurality of second through holes are evenly distributed along the circumference of the second collimating structure.

[0016] In a second aspect, the present application provides a scattering imaging control system. The scattering imaging control system includes the scattering imaging device of any one of the above items; the scattering imaging control system also includes an information acquisition device, which is used to acquire a scattered beam formed by the second beam on the object to be detected. The scattering imaging control system provided by the present application, since it includes the scattering imaging device of any one of the above items, has the same technical effect as the above scattering imaging device, that is, the structure of the scattering imaging device is simplified, the volume is reduced, and it is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 One of the internal structure schematic diagrams of the scattering imaging device provided in an embodiment of the present application;

[0018] Figure 2 A second schematic diagram of the internal structure of the scattering imaging device provided in an embodiment of the present application;

[0019] Figure 3 A schematic diagram of the expansion of a first collimation structure of a scattering imaging device provided in an embodiment of the present application;

[0020] Figure 4A schematic diagram of the expansion of a second collimation structure of the scattering imaging device provided in an embodiment of the present application;

[0021] Figure 5 A diagram showing the relationship between a first through hole and a ray source of a scattering imaging device provided in an embodiment of the present application;

[0022] Figure 6 A diagram showing the relationship between a second through hole and a ray source of a scattering imaging device provided in an embodiment of the present application;

[0023] Figure 7 One of the partially hidden structural schematic diagrams of the scattering imaging device provided in an embodiment of the present application (top view);

[0024] Figure 8 The second schematic diagram of a partially hidden structure of the scattering imaging device provided in an embodiment of the present application (looking up from above);

[0025] Fig. 9 A schematic diagram of the structure of a scattering imaging control system provided in an embodiment of the present application.

[0026] Reference numerals:

[0027] 1-ray source; 2-first collimation structure; 21-first shielding cavity; 22-first through hole; 3-second collimation structure; 31-second shielding cavity; 32-second through hole; 33-gear; 4-bracket; 41-limiting guide; 42-upper cover; 421-adjusting opening; 43-lower cover; 45-limiting member; 5-driving member; 6-identification structure; 61-first identification; 62-second identification; 7-detector; 8-movable rod. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0029] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0030] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to the changes in the orientation of the components in the drawings.

[0031] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0032] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0033] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0034] Scattering imaging is a type of radiation imaging technology. Its basic method is to collimate the radiation source into a pencil beam, use the collimated radiation to sequentially illuminate each position of the object to be detected, and receive the scattered signal at the corresponding position through the detector. The signal is processed by electronics and computers to finally obtain the scattered image of the scanned object. Currently, the commonly used radiation source control device is mainly based on the "flying spot" technology or its variants.

[0035] Among them, the radiation source is an X-ray machine. The rays emitted from the X-ray machine first pass through a slit "wall" to be collimated into a vertical thin fan-shaped beam. The collimated rays then pass through a chopper wheel, which has a rotatable slit "engraved" radially on it. When the chopper wheel rotates, the rays are further collimated into a pencil beam that reciprocates up and down. As the object to be measured moves, the collimated pencil beam hits various positions of the object to be measured in turn in time, so that the detector only receives the signal scattered back from one irradiation point of the object to be measured within a certain period of time, so that a complete scattering image can be obtained.

[0036] However, in the related art, it is necessary to install additional shielding bodies on the sides and rear of the radiation source mechanism; at the same time, the high voltage, cooling and other systems supporting the X-ray machine radiation source are large in size, resulting in the overall device being complex, bulky and having high maintenance costs.

[0037] An embodiment of the present application provides a scattering imaging control system, which includes the scattering imaging device of any one of the above items; the scattering imaging control system also includes an information collection device, which is used to collect a scattering beam formed by the second beam on the object to be detected.

[0038] In the embodiment of the present application, the scattering imaging device is used to generate and modulate the ray source 1 to form a specific ray beam (such as a pencil beam or a line beam) and irradiate it onto the object to be detected. The scattering imaging device may include components such as a ray source 1 (such as an X-ray source 1), a collimator, a chopper wheel (or a rotatable drum), etc., which are used to control the direction and intensity of the ray. For example, in the embodiment provided by the present application, the second beam in the scattering imaging device is emitted by the ray source 1, and a scattering beam is formed on the object to be detected.

[0039] In the embodiment of the present application, the information acquisition device is used to capture the scattered beam formed by the second beam on the object to be detected. The information acquisition device can be a highly sensitive detector array, etc., which can accurately measure the intensity, direction and distribution of the scattered beam. By transmitting this information to the subsequent data processing module, three-dimensional reconstruction or high-precision imaging of the internal structure of the object to be detected can be achieved.

[0040] Reference Fig. 9 In the embodiment of the present application, the scatter imaging control system may further include a power module, a drive module, a control module, a communication module, etc. The drive module may be connected to the motor to drive the scatter imaging device to work; the control unit is connected to a liquid crystal display (LCD) screen, and the LCD screen is used to display the parameters of each part of the scatter imaging control system; the communication module may be connected to the electrical characteristics (RS422) of the balanced voltage digital interface circuit for remote data transmission, such as remote control, remote monitoring, remote data acquisition, etc.

[0041] The scattered imaging control system provided in the embodiments of the present application is generally applicable to cargo inspection, such as luggage inspection, vehicle inspection and other application scenarios.

[0042] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4The embodiment of the present application provides a scattering imaging device, and the present application provides a scattering imaging device, which includes a ray source 1, a first collimating structure 2, and a second collimating structure 3. The ray source 1 is used to emit a ray beam; the first collimating structure 2 includes a first shielding cavity 21 and a first through hole 22, the ray source 1 is arranged in the first shielding cavity 21, and the first through hole 22 is used to limit the shape of the ray beam to form a first beam; the second collimating structure 3 includes a second shielding cavity 31 and a second through hole 32, the first collimating structure 2 is arranged in the second shielding cavity 31, and the second through hole 32 is used to adjust the shape of the first beam to form a second beam; wherein the first collimating structure 2 and the second collimating structure 3 are both provided with a shielding layer to shield the ray beam that does not pass through the first through hole 22 in the first shielding cavity 21; and shield the first beam that does not pass through the second through hole 32 in the second shielding cavity 31.

[0043] In the embodiment of the present application, the ray source 1 is used to emit high-energy ray beams, such as X-rays or gamma rays, etc. These ray beams are used in the subsequent scattering imaging process.

[0044] In the embodiment of the present application, the first shielding cavity 21 is used to accommodate the radiation source 1 and effectively shield the radiation beam that has not passed through the first through hole 22 to prevent it from leaking into the external space, thereby reducing potential harm to the environment and operators. The second shielding cavity 31 is used to accommodate the first collimating structure 2 and further shield the first beam that has not passed through the second through hole 32, so that only the radiation beam that has undergone two shape adjustments (i.e., the second beam) can be emitted from the second collimating structure 3.

[0045] In the embodiment of the present application, the shapes of the first collimating structure 2 and the second collimating structure 3 can be adjusted according to needs, and can be a cylinder, a cuboid, a prism, etc. In the embodiment provided by the present application, the first collimating structure 2 and the second collimating structure 3 are cylindrical.

[0046] In the embodiment of the present application, the radiation source 1 is arranged in the first shielding cavity 21. In order to improve the shielding effect of the first collimating structure 2 on the radiation beam, the first collimating structure 2 can be set to a hollow cylindrical structure with a first shielding cavity 21 formed inside. The radiation source 1 is arranged in the first shielding cavity 21, and the radiation beam can only be emitted from the first shielding cavity 21 through the first through hole 22.

[0047] In another embodiment, in order to facilitate the installation and replacement of the radiation source 1, the first collimation structure 2 can also be set as a circular cylindrical structure, the radiation source 1 is set in the cylinder, and the openings at both ends of the cylinder are sealed with a material that can shield the radiation beam. In this way, when the radiation source 1 needs to be replaced and maintained, the openings at both ends of the cylinder can be opened for operation.

[0048] In the embodiment of the present application, the second collimating structure 3 can also be set as a hollow cylindrical structure or a circular tube structure, which can be adjusted according to the requirements of the scattering imaging device, and the present application does not limit this. For example, the second collimating structure 3 adopts a hollow cylindrical structure.

[0049] In the embodiment of the present application, the first through hole 22 is used to limit the shape of the beam of rays to form a first beam with a specific shape and intensity; the second through hole 32 is used to further adjust the shape of the first beam to form a second beam with higher precision and a more specific shape. The shapes and positions of the first through hole 22 and the second through hole 32 are adjusted according to the imaging requirements, and this application does not limit this.

[0050] In the embodiment of the present application, a shielding layer is provided inside the first collimating structure 2 and the second collimating structure 3. The shielding layer can be made of a high-density shielding material, which can effectively absorb and block the radiation beam that does not pass through the through hole, thereby ensuring the precise control and safety of the radiation. In addition, the first collimating structure 2 and the second collimating structure 3 can be directly made of a material that can shield radiation, such as lead, depleted uranium, etc.

[0051] For example, in the embodiment provided in the present application, in order to further reduce the volume of the scattering imaging device, the first collimation structure 2 is made of depleted uranium material with stronger shielding performance, the second collimation structure 3 is made of lead, and the outside of the second collimation structure 3 is also wrapped with stainless steel.

[0052] For example, taking a cesium-137 (Cs-137) radiation source with an activity not exceeding 2.5 Curies (Ci) as an example, in order to make the dose rate at 5 cm from the surface of the scattering imaging device not exceed 2.5 microsieverts per hour (uSv / h), effective shielding measures need to be taken for the radiation source. According to calculations, if pure lead is used as the shielding material, the required equivalent lead shielding thickness is about 12.0 cm. In order to further reduce the volume of the device while ensuring safety, a double-layer shielding combining depleted uranium (a material with high density that can effectively absorb radiation, but attention should be paid to its radioactivity and handling safety) and lead can be selected. At this time, the first collimation structure 2 is shielded by depleted uranium, and the shielding thickness of the first collimation structure 2 can be designed to be 5.0 cm; the second collimation structure 3 is further shielded by lead, and the thickness of the lead layer can also be 5.0 cm.

[0053] In the scattering imaging device of the embodiment of the present application, the ray source 1 is arranged in the first shielding cavity 21 of the first collimating structure 2, and the first collimating structure 2 also includes a first through hole 22. Part of the ray beam emitted by the ray source 1 can be emitted from the first shielding cavity 21 through the first through hole 22 to form a first beam, and the shape of the first beam changes with the shape of the first through hole 22. Since the first collimating structure 2 is arranged in the second shielding cavity 31 of the second collimating structure 3, and the second collimating structure 3 also includes a second through hole 32, the first beam can be emitted from the second shielding cavity 31 through the second through hole 32 to form a second beam, and at this time, the shape of the second beam changes with the shape of the second through hole 32. Since the first collimating structure 2 and the second collimating structure 3 are both provided with a shielding layer, the ray beam that does not pass through the first through hole 22 and the second through hole 32 can be shielded in the first shielding cavity 21 and the second shielding cavity 31. That is, through the first collimating structure 2 and the second collimating structure 3, the radiation beam emitted by the radiation source 1 can form a first beam and a second beam, and other radiation beams can also be shielded in the first shielding cavity 21 and the second shielding cavity 31. With such a structure, the shielding of the radiation source 1, the shape formation of the radiation beam and other functions can be integrated into the first collimating structure 2 and the second collimating structure 3.

[0054] Compared with the complex component layout in the related art, the volume is reduced, and the structure of the scattering imaging device is simplified and optimized. In this way, not only space resources are saved, but also the mobility and deployment flexibility of the scattering imaging device are improved, so that the scattering imaging device can be more widely used in different scenes and environments. In addition, the scattering imaging device of the present application reduces the steps and time required during the assembly and configuration process, and reduces the difficulty and cost of installation. Operators can complete the deployment and debugging of the device more quickly, thereby improving work efficiency and overall performance.

[0055] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 In some possible embodiments of the present application, the scattering imaging device also includes a bracket 4, the first collimating structure 2 is installed on the bracket 4, the second collimating structure 3 can be rotatably installed on the bracket 4, and the second collimating structure 3 can be rotated relative to the first collimating structure 2 so that a partial area of ​​the second through hole 32 overlaps with the first through hole 22.

[0056] In the embodiment of the present application, the bracket 4 provides an installation base and support for the first collimating structure 2 and the second collimating structure 3. The bracket 4 is provided with an opening allowing the second beam to pass through. The position of the opening is aligned with the position of the overlapping part of the first through hole 22 and the second through hole 32.

[0057] In the embodiment of the present application, a partial area of ​​the second through hole 32 overlaps with the first through hole 22, which can be understood as an overlap between a partial area of ​​the second through hole 32 and a projection of the first through hole 22 in the radial direction of the first collimator and the second collimator along the trajectory of the ray beam emission. The overlapping area allows the first beam to be emitted from the second shielding cavity 31.

[0058] In the scattering imaging device of the embodiment of the present application, since the second collimating structure 3 can be rotatably mounted on the bracket 4, and the first collimating structure 2 is mounted on the bracket 4, rotating the second collimating structure 3 can change the angle between the second collimating structure 3 and the first collimating structure 2, thereby adjusting the angle between the first through hole 22 and the second through hole 32, so that a partial area of ​​the second through hole 32 overlaps with the first through hole 22. At this time, the shape of the second beam will be adjusted to the shape of the overlapping area of ​​the second through hole 32 and the first through hole 22. As the second collimating structure 3 rotates, the shape of the second beam changes, so that it can be partially projected onto the object to be measured.

[0059] Reference Figure 1 and Figure 2 In some possible embodiments of the present application, the scattering imaging device further includes a driving member 5 , which is connected to the second collimating structure 3 to drive the second collimating structure 3 to rotate relative to the first collimating structure 2 .

[0060] In the embodiment of the present application, the driving member 5 can be driven by a motor or pneumatically, etc. For example, in the embodiment provided by the present application, a gear 33 adapted to the driving member 5 is further provided on the outer circumference of the second collimating cylinder, and the gear 33 is meshed with the driving member 5. The driving member 5 provides a driving force to the gear 33, and the driving gear 33 rotates, driving the second collimating structure 3 to rotate relative to the first collimating structure 2.

[0061] In the embodiment of the present application, the driving member 5 may also be connected to the control unit, and the driving member 5 may receive a signal from the control unit to drive the reduction gear 33 to rotate according to a set rotation speed.

[0062] In the scattering imaging device of the embodiment of the present application, since the driving member 5 drives the second collimating structure 3 to rotate relative to the first collimating structure 2, the driving member 5 can be controlled to make real-time and accurate adjustments to the alignment speed of the second collimating structure 3 as needed, thereby optimizing the projection direction and angle of the ray beam, thereby improving the imaging quality. This improves the working efficiency of the scattering imaging device and enhances the imaging quality.

[0063] Reference Figure 3 and Figure 4In some possible embodiments of the present application, the scattering imaging device also includes an identification structure 6, which is arranged on the second collimation structure 3; a detector 7, which is configured to identify the identification structure 6 to obtain a rotation parameter of the second collimation structure 3 relative to the first collimation structure 2; and a controller, which is configured to control the radiation source 1 and the driving member 5 based on the rotation parameter.

[0064] In the embodiment of the present application, the identification structure 6 is arranged on the second collimation structure 3, and the identification structure 6 can be a physical mark (such as a barcode, a two-dimensional code, a magnetic stripe, an optical mark, etc.) or an electronic mark (such as an RFID tag, a wireless sensor, etc.). The identification structure 6 is used to provide a reference point or information that can be identified to the detector 7, so as to determine the current rotation state or position of the second collimation structure 3.

[0065] In the embodiment of the present application, the identification structure 6 includes a first identification 61 and a second identification 62. The first identification 61 is used by the detector 7 to detect the start of each scan, and the second identification 62 is used by the detector 7 to detect the rotation speed of the second collimation structure 3. For example, the first identification 61 is set at the starting position of the second through hole 32, that is, the position where the second through hole 32 first overlaps with the first through hole 22 in the rotating state. The second identification 62 is evenly distributed on the second collimation structure 3, and when the second collimation structure 3 rotates, it can reflect the speed at which the second collimation structure 3 is aligned.

[0066] In the embodiment of the present application, the type of the detector 7 depends on the type of the identification structure 6, and the detector 7 can be an optical detector 7 (such as a camera, a barcode reader), a magnetic detector 7, an RFID reader or a wireless sensor network, etc. The detector 7 is configured to be able to identify and read the information provided by the identification structure 6. By identifying this information, the detector 7 can calculate the rotation parameters of the second collimation structure 3 relative to the first collimation structure 2, such as the rotation angle, the rotation direction, etc.

[0067] For example, in the embodiment provided by the present application, the detector 7 is a photoelectric sensor, which is used to obtain the rotation speed and scanning position of the scattering imaging device. The transmitting end and the receiving end of the photoelectric sensor are respectively installed on the inner side and the outer side of the second collimation structure 3. When the collimation cylinder rotates, the photoelectric sensor can detect a continuous on-off signal through the second mark 62, thereby calculating and obtaining the current scanning position and speed, and this speed value is fed back to the control unit.

[0068] Taking vehicle inspection as an example, if the relative speed between the detector 7 and the vehicle is 0.1 meters per second (m / s) m / s, if the horizontal detection resolution is required to be 5 millimeters per second (mm / s) mm / s, the scanning speed of the scattering imaging device should reach 20 revolutions per second. When 4 scanning lines are designed on the second collimation structure 3, the rotation speed of the second collimation structure 3 should reach 5 revolutions per second.

[0069] In the embodiment of the present application, the controller is used to receive the rotation parameter information from the detector 7, and accurately control the ray source 1 and the driver 5 according to the information. The logic of the controller controlling the ray source 1 can be: based on the rotation parameter, the controller can adjust the parameters such as the emission angle, intensity or pulse width of the ray source 1. The logic of the controller controlling the driver 5 can be: if the position or angle of the second collimating structure 3 needs to be adjusted, the controller can drive the driver 5 to rotate by sending instructions to it until the required rotation parameter is reached, so that the ray beam can pass through the second collimating structure 3 and be projected to the target area.

[0070] Reference Figure 1 and Figure 2 In some possible embodiments of the present application, the scattering imaging device also includes a movable rod 8, which can movably pass through the first collimating structure 2 and be connected to the radiation source 1; the movable rod 8 can drive the radiation source 1 to move to a storage position and a working position relative to the first shielding cavity 21; when the radiation source 1 is in the working position, the radiation source 1 is aligned with the first through hole 22; when the radiation source 1 is in the storage position, the radiation source 1 is aligned with the shielding layer.

[0071] In the embodiment of the present application, the first collimating structure 2 includes a mounting through hole, which is coaxially arranged with the first collimating structure 2. The movable rod 8 extends into the first shielding cavity 21 through the mounting through hole and is connected to the radiation source 1. In this way, the movable rod 8 can be used as a mobile carrier of the radiation source 1 to drive the radiation source 1 to adjust its position in the first shielding cavity 21.

[0072] In the embodiment of the present application, the movable radiation source 1 moves in the first shielding cavity 21 along the axial direction of the first collimating structure 2. When the radiation source 1 is in the working position, the radiation source 1 is aligned with the first through hole 22 on the first collimating structure 2. It can be understood that at this time, the radiation beam emitted by the radiation source 1 can be emitted from the first through hole 22 to form the required first beam, and the scattering imaging device can perform scanning imaging. When the scattering imaging device is not needed to work temporarily or for a long time (for example, in the gap between imaging processes or during maintenance), the radiation source 1 can be moved to the storage position by the movable rod 8. In the storage position, the radiation source 1 is aligned with the shielding layer, so that the shielding layer can effectively block the radiation beam to prevent the radiation from leaking into the environment when the radiation source 1 is not working, which helps to protect operators and other personnel from unnecessary radiation damage.

[0073] In the embodiment of the present application, the movable rod 8 can also be connected to the controller, so that the movable rod 8 can be flexibly controlled by the controller, reducing manual operation and improving safety.

[0074] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 In some possible embodiments of the present application, the first collimating structure 2 can be rotatably disposed on the bracket 4, and the first collimating structure 2 rotates relative to the bracket 4 to adjust the angle of the first through hole 22 relative to the bracket 4.

[0075] In the embodiment of the present application, the first collimating structure 2 can be connected to the bracket 4 through a bearing, a rotating shaft or the like, so that the first collimating structure 2 can rotate on the bracket 4. By rotating the first collimating structure 2, the angle of the first through hole 22 relative to the bracket 4 can be adjusted, thereby changing the irradiation direction of the beam.

[0076] Reference Figure 7 and Figure 8 , Figure 7 The figure shows a partially hidden structure schematic diagram of the scattering imaging device, and the viewing angle is a top view, which is used to show the internal structure of the scattering imaging device. Figure 7 Four hollows are made in the figure to facilitate observation of the internal structure of the scattering imaging device. In fact, the cover 42 is an integral structure without hollows. Figure 8 The figure shows a partially hidden structure diagram of the scattering imaging device, and the viewing angle is a bottom view, which is used to show the internal structure of the scattering imaging device. Figure 8 Four hollows are made in the figure to facilitate observation of the internal structure diagram of the scattering imaging device. The actual lower cover 43 is an integral structure and there is no hollow. The adjustment of the angle of the first collimating structure 2 relative to the bracket 4 can be achieved manually or automatically, depending on the complexity and precision requirements of the application. For example, the bracket 4 also includes an upper cover 42 and a lower cover 43. The upper cover 42 is provided with an adjustment opening 421 in the area close to the axis of the first collimating structure 2. When the first collimating structure 2 needs to be rotated and adjusted, the operator can manually rotate and adjust the first collimating structure 2 through the adjustment opening 421.

[0077] Reference Figure 1 and Figure 2 In some possible embodiments of the present application, the bracket 4 includes a limiting guide 41, which is arranged around the axis of the second collimation structure 3, and the second collimation structure 3 is connected to the limiting guide 41; the limiting guide 41 is used to provide a limit to the second collimation structure 3, and / or the second collimation structure 3 can rotate along the limiting guide 41.

[0078] In the embodiment of the present application, the limiting guide member 41 is used to limit the second collimating structure 3 in the radial direction of the second collimating structure 3, and provide guidance for the rotation of the second collimating structure 3. The limiting guide structure can be a sliding guide rail, a rotating bearing, etc. For example, in the embodiment provided by the present application, the limiting guide structure is a groove provided on the bracket 4, and the shape of the groove is circular. The parts where the two ends of the second collimating structure 3 and the bracket 4 are connected are provided with protrusions, and the protrusions are adapted to the grooves. The protrusions are inserted into the grooves, and the second collimating structure 3 and the bracket 4 can be connected.

[0079] In the embodiment of the present application, a limiting guide 41 may also be provided in the area of ​​the bracket 4 connected to the first collimating structure 2 to provide a limit for the first collimating structure 2 , and / or the first collimating structure 2 may rotate along the limiting guide 41 .

[0080] In the embodiment of the present application, the bracket 4 further includes a limiter 45, which is used to limit the displacement of the first collimating structure 2 and the second collimating structure 3 in the radial direction of the first collimating structure 2. The present application does not limit the form of the limiter 45. For example, the limiter 45 is arranged between the outer peripheral side of the first collimating structure 2 and the inner peripheral side of the second collimating structure 3, and is used to further limit the first collimating structure 2 and the second collimating structure 3 in the radial direction, thereby improving the stability of the spacing between the first collimating structure 2 and the second collimating structure 3, and improving the imaging quality of the scattering imaging device.

[0081] In some possible embodiments of the present application, the first through hole 22 is arranged on the circumferential side of the first collimating structure 2, and the extension direction of the first through hole 22 is parallel to the axial direction of the first collimating structure 2; the second through hole 32 is arranged on the circumferential side of the second collimating structure 3, and there is an angle between the extension direction of the second through hole 32 and the extension direction of the first through hole 22.

[0082] In the present application, refer to Figure 5 and Figure 6 , Figure 5 The left side shows Figure 2 The structure in the right side is shown as Figure 3 In the structure (that is, the expanded view of the first collimating structure 2), two dotted lines at a certain angle from the ray source 1 are the opening angles of the ray source 1, and the opening angles intersect with the outer surface of the first collimating structure 2 at a point, and two dotted lines are drawn in parallel from the point, and the spacing between the two parallel dotted lines corresponds to the extension length of the first through hole 22; similarly, Figure 6 The left side shows Figure 2 The structure in the right side is shown as Figure 4In the structure (that is, the expanded view of the second collimating structure 3), the two dotted lines at a certain angle from the ray source 1 are the opening angles of the ray source 1. The opening angles and the outer surface of the second collimating structure 3 intersect at two points. Two dotted lines are drawn in parallel from the points. The spacing between the two parallel dotted lines corresponds to the extension length of the second through hole 32. The length of the first through hole 22 extending along the axial direction of the first collimating structure 2, as well as the position and height of the first through hole 22 on the first collimating structure 2 are determined by the opening angles of the rays emitted by the ray source 1. The width of the first through hole 22 is usually not more than 2 millimeters (mm).

[0083] In the embodiment of the present application, there is an angle between the extension direction of the second through hole 32 and the extension direction of the first through hole 22, and the size of the angle is determined by the scanning requirements of the scattering imaging device. The extension length of the second through hole 32, as well as the position and height of the second through hole 32 on the second collimating structure 3 are determined by the angle of the ray emitted by the ray source 1, and the width of the second through hole 32 is usually not more than 2 millimeters (mm).

[0084] In addition, in theory, the vertical resolution is mainly determined by the density of the detector, but in practice, the angles of the first through hole 22 and the second through hole 32 of the first collimation structure 2 and the second collimation structure 3 also determine the spot size and shape of the irradiation point. In addition, the rotation speed of the second collimation structure 3 also affects the acquisition time of the electronic signal and is reflected in the statistical fluctuation of the signal. Therefore, the second through hole 32 should be obtained based on a comprehensive analysis of the design indicators of the system.

[0085] In some possible embodiments of the present application, there are a plurality of second through holes 32 , and the plurality of second through holes 32 are evenly distributed along the circumference of the second collimating structure 3 .

[0086] In the embodiment of the present application, the specific number of the second through holes 32 can be adjusted according to the setting requirements. When the second collimating structure 3 rotates the same number of times, multiple second through holes 32 increase the number of second beams formed, thereby improving the imaging efficiency of the scattering imaging device.

[0087] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A scattering imaging device, characterized in that: include: A ray source, used for emitting a ray beam; A first collimating structure, comprising a first shielding cavity and a first through hole, wherein the ray source is disposed in the first shielding cavity, and the first through hole is used to limit the shape of the ray beam to form a first beam; A second collimating structure comprises a second shielding cavity and a second through hole, wherein the first collimating structure is disposed in the second shielding cavity, and the second through hole is used to adjust the shape of the first beam to form a second beam; The first collimating structure and the second collimating structure are both provided with a shielding layer to shield the ray beam that does not pass through the first through hole in the first shielding cavity; and to shield the first beam that does not pass through the second through hole in the second shielding cavity.

2. The scattering imaging device according to claim 1, characterized in that: A bracket is also included, the first collimating structure is mounted on the bracket, the second collimating structure is rotatably mounted on the bracket, and the second collimating structure is rotatable relative to the first collimating structure so that a partial area of ​​the second through hole overlaps with the first through hole.

3. The scattering imaging device according to claim 2, characterized in that: The device further comprises a driving member connected to the second collimating structure to drive the second collimating structure to rotate relative to the first collimating structure.

4. The scattering imaging device according to claim 3, characterized in that: Also includes: an identification structure, arranged on the second alignment structure; a detector configured to identify the identification structure to obtain a rotation parameter of the second collimation structure relative to the first collimation structure; A controller is configured to control the radiation source and the driving member based on the rotation parameter.

5. The scattering imaging device according to any one of claims 1 to 4, characterized in that: It also includes a movable rod, which can movably pass through the first collimation structure and be connected to the radiation source; the movable rod can drive the radiation source to move to a storage position and a working position relative to the first shielding cavity; When the ray source is in the working position, the ray source is aligned with the first through hole; When the radiation source is in the storage position, the radiation source is aligned with the shielding layer.

6. The scattering imaging device according to any one of claims 2 to 4, characterized in that: The first collimating structure is rotatably disposed on the bracket, and the first collimating structure rotates relative to the bracket to adjust the angle of the first through hole relative to the bracket.

7. The scattering imaging device according to any one of claims 2 to 4, characterized in that: The bracket includes a limiting guide, which is arranged around the axis of the second collimation structure, and the second collimation structure is connected to the limiting guide; the limiting guide is used to provide limitation for the second collimation structure, and / or the second collimation structure can rotate along the limiting guide.

8. The scattering imaging device according to any one of claims 1 to 4, characterized in that: The first through hole is arranged on the circumferential side of the first collimating structure, and the extension direction of the first through hole is parallel to the axial direction of the first collimating structure; the second through hole is arranged on the circumferential side of the second collimating structure, and there is an angle between the extension direction of the second through hole and the extension direction of the first through hole.

9. The scattering imaging device according to claim 8, characterized in that: There are a plurality of the second through holes, and the plurality of the second through holes are evenly distributed along the circumference of the second collimating structure.

10. A scattering imaging control system, characterized in that: include: The scattering imaging device according to any one of claims 1 to 9; The information collection device is used to collect the scattered beam formed by the second beam on the object to be detected.

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