Testing device for testing imaging quality of security inspection equipment

Abstract

The utility model provides a testing device for testing the imaging quality of security inspection equipment, which comprises a bottom plate and a plurality of testing components arranged on the bottom plate, the plurality of test assemblies at least comprise an effective material resolution and material resolution test assembly, a spatial resolution and image distortion test assembly, a mixture and inorganic matter resolution test assembly, a penetrating power test assembly and a penetrating resolution test assembly, and the mixture and inorganic matter resolution test assembly comprises two annular steps; wherein one annular step is an annular step made of a mixture material and is used for detecting the distinguishing capability of the security inspection equipment to the mixture, and the other annular step is an annular step made of an inorganic material and is used for detecting the distinguishing capability of the security inspection equipment to the inorganic material. The testing device provided by the utility model has the characteristics of high integration level, small size and light weight, and can cover the detection of various common performance indexes, so that the testing process is more convenient and faster.

Description

TECHNICAL FIELD

[0001] The utility model relates to security check technical field especially relates to a test device for testing security check equipment imaging quality. BACKGROUND

[0002] The security check equipment can cause structure change in the splitting transportation assembly process, or the performance of the device inside the security check equipment can degrade with the increase of the service life, for example, the X-ray tube degradation causes the insufficient X-ray dose, and the like, these factors can cause the imaging quality of the security check equipment to decline in different degrees compared with the factory shipment, can cause the misjudgment or the missed judgment of the contraband, and there is a big security risk. However, the current test device cannot cover various performance indexes to be detected, or the volume and weight are relatively large, and the use is inconvenient, so that the test process is relatively cumbersome. SUMMARY

[0003] The utility model provides a test device for testing security check equipment imaging quality.

[0004] In order to achieve the above technical effect, the utility model embodiment discloses the following technical scheme:

[0005] First, a test device for testing security check equipment imaging quality is provided, which includes a bottom plate and a plurality of test components arranged on the bottom plate, the plurality of test components at least include: effective material resolution and material resolution test component, spatial resolution and image distortion test component, mixture and inorganic matter resolution test component, penetration power test component, penetration resolution test component, wherein the mixture and inorganic matter resolution test component includes two annular steps, one of which is a mixture material annular step for detecting the resolution ability of the security check equipment to the mixture, and the other is an inorganic material annular step for detecting the resolution ability of the security check equipment to the inorganic matter.

[0006] The utility model embodiment provides the technical scheme at least includes the following beneficial effects:

[0007] The utility model provides a test device for testing security check equipment imaging quality, the structure of mixture and inorganic matter resolution test subassembly in this test device has been improved, so that this test subassembly guarantees test precision, and volume and weight are as small as possible, so that can integrate the test subassembly for detecting each performance index of security check equipment commonly used to a test device, only needs using a test device can complete the test of each performance index of security check equipment.

[0008] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory and are not restrictive of the specification. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is the structure schematic diagram of national standard test body A.

[0010] Figure 2 It is the structure schematic diagram of national standard test body B.

[0011] Figure 3 It is the schematic diagram of test device of one embodiment of the application.

[0012] Figure 4 It is the schematic diagram of mixture and inorganic matter resolution test subassembly of one embodiment of the application.

[0013] Figure 5 It is the schematic diagram of test device of one embodiment of the application.

[0014] Figure 6 It is the schematic diagram of space resolution and image distortion test subassembly of one embodiment of the application.

[0015] Figure 7 It is the schematic diagram of effective material resolution and material resolution test subassembly of one embodiment of the application.

[0016] Figure 8 It is the schematic diagram of penetration power test subassembly of one embodiment of the application.

[0017] Figure 9 It is the schematic diagram of penetration resolution test subassembly of one embodiment of the application.

[0018] Figure 10 It is the top view of test device of one embodiment of the application. DETAILED DESCRIPTION

[0019] In order to make the technical scheme in the embodiments of the present application better understood, and in order to make the above-mentioned purpose, characteristics and advantages of the embodiments of the present application more apparent, clear and easy to understand, the technical scheme in the embodiments of the present application will be further described in detail below with reference to the drawings.

[0020] The security inspection equipment generally comprises an X-ray security inspection machine and a display device used in conjunction therewith. When the passenger luggage enters the X-ray security inspection machine, the X-ray security inspection machine emits X-rays to scan and image the luggage, and an inspection image of the luggage is obtained. The inspection image can be presented on the display device, and the security inspection personnel can determine whether there is any prohibited article in the passenger luggage by judging the inspection image.

[0021] The security inspection equipment may be disassembled and assembled during transportation, or the performance of the components inside the security inspection equipment may degrade with the increase of the service life, for example, the X-ray tube degrades to cause insufficient X-ray dose. These factors may cause the imaging quality of the security inspection equipment to decrease to different degrees compared with that when the security inspection equipment is shipped, which may cause misjudgment or missed judgment of the prohibited articles, and there is a great security risk.

[0022] In order to evaluate the imaging quality of the security inspection equipment, some pre-designed test devices are generally used to test various performance indicators (such as spatial resolution, penetration, material resolution, etc.) of the security inspection equipment. During the test process, the test device can be imaged by the security inspection equipment to obtain a corresponding inspection image, and then whether the various performance indicators of the security inspection equipment meet the standards can be evaluated through the inspection image. For example, whether the lines in the inspection image are clearly visible can be used to determine the spatial resolution of the security inspection equipment.

[0023] The test devices provided in the related art cannot cover various performance indicators to be detected, or have a large volume and weight, and are inconvenient to use. For example, the commonly used test devices include a national standard test body A and a national standard test body B. The national standard test body A is mainly used to detect the resolution of the inspection image collected by the security inspection equipment, and the national standard test body B is mainly used to detect the material resolution of the security inspection equipment. Figure 1 As shown in FIG. 1, it is a schematic diagram of the national standard test body A. The national standard test body A is divided into four test regions, and each test region is provided with a corresponding test component, which is respectively used to test the line resolution (TEST1), the penetration resolution (TEST2), the spatial resolution (TEST3) and the penetration (TEST4) of the security inspection equipment and the like. Figure 2 As shown in FIG. 2, it is a schematic diagram of the national standard test body B. The national standard test body B is also divided into four test regions, which are respectively used to test the organic matter resolution (TEST5 and TEST6), the mixture resolution (TEST7), the inorganic matter resolution (TEST8), the material resolution and the effective material resolution (TEST9 and TEST10) of the security inspection equipment and the like.

[0024] It can be seen that in order to cover the performance indicators of the security inspection equipment, two test bodies need to be used when the security inspection equipment is tested by using the national standard test bodies, and the test bodies need to be replaced during the test process, which is relatively cumbersome, and the volume and weight of the two test bodies are relatively large, which causes many inconveniences in the test process. The reason why the national standard test bodies are designed as two test bodies is that some test components in the test bodies are relatively large in volume and heavy in weight, and if these test components are integrated into one test body, the volume and weight of the test body will be very large, which is inconvenient to use.

[0025] For example, taking the test components for detecting the resolution capability of the security inspection equipment on the mixture and inorganic matter in the national standard test body B as an example, the mixture resolution test component (such as Test7 in Figure 2 ) in the national standard test body B includes long strip-shaped thin aluminum alloy steps and long strip-shaped thick aluminum alloy steps, and different thicknesses of aluminum alloy are used to simulate different categories of mixtures. In order to simulate as many categories of mixtures as possible, the number of steps is often set to be relatively large, which causes the length of the two long strip-shaped steps to be relatively long and basically occupies the length of the entire bottom plate. Figure 2 Similarly, the inorganic matter resolution test component (such as Test8 in Figure 2 ) in the national standard test body B includes long strip-shaped steel plate steps, and different thicknesses of steel plates are used to simulate different categories of inorganic matter. In order to simulate as many categories of inorganic matter as possible, the number of steps is often set to be relatively large, which causes the length of the long strip-shaped steel steps to be relatively long and basically occupies the length of the entire bottom plate. Figure 2 It can be known from that the mixture resolution test component and the inorganic matter resolution test component in the national standard test body B basically occupy half of the volume of the test body. Since the test components are relatively large in volume, the test device cannot accommodate more test components, and in addition, since the test components are relatively large in volume and are made of steel structure material, the weight of the test device is also relatively large.

[0026] Based on this, the application provides a test device for testing the imaging quality of the security inspection equipment. The structure of the mixture and inorganic matter resolution test component in the test device is improved, so that the volume and weight of the test component are as small as possible while ensuring the test precision, so that the test components for detecting the commonly used performance indicators of the security inspection equipment can be integrated into one test device, and only one test device is needed to complete the test of the performance indicators of the security inspection equipment. The test device provided by the application has the characteristics of high integration, small volume and light weight, and can cover the detection of various commonly used performance indicators, so that the test process is more convenient and fast.

[0027] As shown in Figure 3 , it is pointed out that Figure 3These are merely exemplary examples, and the shapes and structures of the various testing components in the testing apparatus provided in this application are not limited to those shown in the figures. The testing apparatus 10 includes a base plate 110 and multiple testing components disposed on the base plate 110. These multiple testing components include at least: a mixture and inorganic matter resolution testing component 120, a spatial resolution and image distortion testing component 130, an effective material resolution and material resolution testing component 140, a penetration power testing component 150, and a penetration resolution testing component 160. To reduce the volume and weight occupied by the mixture and inorganic matter resolution testing component 120, it may include two annular steps. One annular step is made of a mixture material and is used to detect the security inspection equipment's ability to distinguish mixtures, while the other annular step is made of an inorganic material and is used to detect the security inspection equipment's ability to distinguish inorganic substances. Compared to long, narrow steps, by designing the mixture and inorganic matter differentiation test component 120 as a ring-shaped step, it is possible to ensure that the number of steps is sufficient (i.e., the number of simulated mixtures and inorganic matter categories is sufficient) while minimizing the space occupied by the test component and making the test component lighter. This reduces the overall size and weight of the test device, allowing the test device to integrate more test components and achieve weight reduction.

[0028] In some embodiments, such as Figure 4 As shown, the two annular steps can be two semi-circular steps of the same size. The two semi-circular steps are fixed to the base plate 110 and combined to form a ring. One semi-circular step is a semi-circular step 120a made of a mixed material, used to detect the security inspection equipment's ability to distinguish mixed materials. The other semi-circular step is a semi-circular step 120b made of an inorganic material, used to detect the security inspection equipment's ability to distinguish inorganic materials. By designing the mixed material and inorganic material distinguishing test component 120 into a semi-circular step shape, and then combining the two into a ring fixed in the base plate 110, the space occupied by the test component can be greatly reduced, the weight of the test component can be reduced, and thus the volume and weight of the entire test device can be reduced, achieving lightweight design. In some embodiments, the two annular steps can also be combined to form an elliptical ring, which can be set according to actual needs.

[0029] The dimensions, thickness, number of steps, and arrangement of the two semi-circular steps in the base plate 110 can be set according to actual needs, and this application embodiment does not impose any restrictions.

[0030] In some embodiments, the semi-circular step 120a of the mixed material is an aluminum alloy semi-circular step, and the semi-circular step 120a of the inorganic material is a carbon steel semi-circular step. Different types of mixed materials are simulated by using aluminum alloys of different thicknesses, and different types of inorganic materials are simulated by using carbon steel of different thicknesses.

[0031] In addition, the national standard test body cannot detect the imaging quality of some self-defined dangerous goods (such as lighters, lithium batteries, flammable liquids, etc.) of the security inspection equipment. Considering that the dangerous goods test assembly is usually set based on different scenes, it does not need to occupy a separate area in the test device. In order to make the test device can realize the detection of dangerous goods while trying to be lightweight, in some embodiments, the plurality of test assemblies includes at least one detachable test assembly. Which test assemblies are detachable, and which designated areas (such as one area or multiple areas, etc.) are used to install the detachable test assemblies can be determined according to the test and evaluation requirements, so that the test device has high scalability in use.

[0032] At least one detachable test assembly is installed in a designated area of the bottom plate (the designated area refers to the area of the bottom plate for installing the detachable test assembly). For example, the detachable test assembly includes test assembly A and test assembly B, test assembly A is installed in a designated area of the bottom plate, test assembly B is installed in another designated area of the bottom plate, or test assembly A and test assembly B can be installed in one designated area.

[0033] In some embodiments, as shown in Figure 5 One of the at least one detachable test assembly is installed in a designated area of the bottom plate 110, and the designated area is provided with an opening 110a. When the detachable test assembly is in a detached state, the opening 110a can be used to fix the dangerous goods test assembly.

[0034] The opening 110a provided on the bottom plate 110 for placing or fixing the dangerous goods test assembly can be a regular circular hole or an oval hole. The number and size of the opening 110a can be set based on actual needs, and the present application does not make any limitation. In an optional implementation, the designated area can install one or more detachable test assemblies described above. When dangerous goods testing is needed, one or more detachable test assemblies described above can be removed, and the dangerous goods assembly (such as lithium batteries, lighters, flammable and explosive liquids, etc.) to be tested can be fixed through the opening 110a, such as being installed on the bottom plate 110 through nylon lock or ribbon. The dangerous goods test assembly can share an area of the bottom plate 110 with one or more test assemblies in the test device. The test assembly that shares the area of the bottom plate 110 with the dangerous goods test assembly can be a test assembly that is easy to detach.

[0035] In some embodiments, the opening 110a provided in the designated area can be a plurality of equally spaced circular holes.

[0036] In some embodiments, the structures of the above-mentioned spatial resolution and image distortion test component 130, effective material resolution and material resolution test component 140, penetration test component 150, and penetration resolution test component 160 can adopt structures similar to the corresponding test components in existing test devices. For example, structures similar to the test components in GB test body A and GB test B can be adopted, and the size of the test components can be set based on actual needs. The principle is to make the volume and weight of the test device as small as possible to achieve lightweight.

[0037] In some embodiments, in order to make the volume and weight of the test device as small as possible to achieve lightweight, the structures of the test components in existing test devices can also be improved to make the volume and weight of the test components as small as possible so that they can be better integrated into a test device.

[0038] The positions and arrangement modes of the above-mentioned multiple test components in the test device can be set based on actual needs. The principle is to make the test components as compactly distributed in the bottom plate 110 as possible to achieve maximum space utilization and minimize the volume of the entire test device.

[0039] The spatial resolution test component in GB test body A (such as Test3 in Figure 1 is composed of four groups of wire pairs made of four different diameter specifications of single solid copper wires directly installed on the bottom plate, which is used to test the resolution capability of the security inspection equipment to the wire pairs. In this design structure, the copper wire is easy to deform and the position is easy to change, which leads to unstable test components and affects the accuracy of the test results. In addition, there is no test component designed specifically for detecting image distortion in the GB test body. Usually, the collected images are only subjectively judged by the test personnel with the naked eye, and there is a lack of accurate measurement index. Based on this, as shown in Figure 6 , the present application designs a spatial resolution and image distortion test component 130. The test component includes a regular-shaped object 130a, and the regular-shaped object is provided with multiple groups of horizontal linear holes 130b and multiple groups of vertical linear holes 130c. The widths of the multiple groups of horizontal linear holes 130b are different, and the widths of the multiple groups of vertical linear holes 130c are different. The outer contour of the regular-shaped object 130a can be used to test the distortion ratio of the image in the vertical and horizontal directions, and the linear holes can be used to test the spatial resolution of the security inspection equipment. The regular-shaped object can be a square object, a rectangular object, etc., and the embodiments of the present application are not limited.

[0040] In some embodiments, the regularly shaped object 130 can be a square copper plate, steel plate, etc., and the linear holes can be holes cut into the surface of the copper or steel plate. Compared with directly using solid copper wire, the line pairs obtained by cutting linear holes into the surface of the object are more stable and less prone to deformation. At the same time, by adopting a regular shape structure, the distortion can be determined based on the ratio of the dimensions of the regularly shaped object in the horizontal and vertical directions (e.g., length-to-width ratio) in the acquired security inspection image. Furthermore, one test component can test two indicators simultaneously, making the test device more compact and smaller in size while covering as many test indicators as possible.

[0041] In some embodiments, such as Figure 7 As shown, the effective material resolution and material resolution test assembly 140 includes a steel step 140b and at least two test plates 140a stacked on the steel step 140b. A portion of each test plate 140a overlaps with the steel step 140b. The at least two test plates 140a have different equivalent atomic numbers, and the equivalent atomic numbers of the at least two test plates 140a are less than the equivalent atomic number of the steel step 140b.

[0042] X-rays are absorbed to varying degrees when passing through different materials, and the absorption capacity of a substance (i.e., X-ray attenuation) is usually related to its atomic number (Z). The higher the atomic number, the stronger the absorption capacity of the substance for X-rays. The effective atomic number (Z_eff) is a value that comprehensively considers the atomic numbers of different elements in a material and their proportions. It can be used to describe the X-ray attenuation characteristics of a material. To test the resolution capability of this security inspection equipment for different materials, as well as its resolution capability after penetrating a steel step (i.e., effective material resolution), at least two test plates with different effective atomic numbers can be set up. These test plates can be placed over the steel step, with a portion of each test plate 140a overlapping with a portion of the steel step 140b, while the remaining portion does not overlap. That is, the steel step only covers a portion of each test plate. Therefore, the unobstructed area of ​​the test plate can be used to test the material resolution capability of the security inspection equipment, while the area of ​​the test plate obstructed by the steel step can be used to test the effective material resolution capability. The at least two test plates 140a can be made of different materials to achieve different equivalent atomic numbers, and the equivalent atomic sequence of the at least two test plates 140a is smaller than the equivalent atomic sequence of the steel step 140b. In some embodiments, the shape of the at least two test plates 140 can be a cuboid.

[0043] The material, size, number of test plates, number of steps, and thickness of the steel staircase can be flexibly set based on actual needs. For example, in some embodiments, such as...Figure 5 As shown, the test plate can include a PVC plate, a polytetrafluoroethylene plate, and a polyethylene plate, and the number of steps of the steel ladder is 2.

[0044] The penetration force test component in the national standard test body A (such as Test4 in Figure 1 is composed of three carbon steel steps with different thicknesses, and a 5mm-thick and 25mm-diameter three-quarter circular lead block is adhered to the surface of each step. If a large part of the three-quarter circular lead block blocked by the steel plate can be seen in the image collected by the security inspection equipment, and the direction of the gap of the three-quarter circular lead block can be distinguished, it can be considered that the security inspection equipment can penetrate the steel step, and the maximum thickness value of the steel step corresponding to the distinguishable three-quarter circular lead block is taken as the thickness value of the steel plate that can be penetrated by the security inspection equipment. Obviously, if this ladder structure design is used, a large number of steel steps need to be set to cover different thicknesses, resulting in a large space occupied by the penetration force test component 150 and a relatively heavy weight. Moreover, since the thickness is discontinuous, the finally determined thickness value of the steel plate that can be penetrated by the security inspection equipment is not accurate enough. Based on this, as shown in Figure 8 , the embodiment of the present application designs a penetration force test component 150, which includes a lead strip and a first cover 150b covering the lead strip 150a. The thickness of the first cover 150b changes in a continuous gradient, so that the X-ray of the security inspection equipment penetrates the first cover 150b with different thicknesses to reach the lead strip. By designing the penetration force test component 150 into the above structure, the gradual change of the thickness of the object penetrated by the security inspection equipment can be realized, the penetration ability of the security inspection equipment when facing objects with different thicknesses can be simulated, and the space occupied by the test component can also be reduced under the condition of covering as many thicknesses as possible. At the same time, similar to the detection of whether the security inspection equipment can distinguish the opening direction of the three-quarter circular lead block in the national standard test body A, the embodiment of the present application can determine the maximum steel plate thickness that can distinguish the shape of the lead strip by adding a lead strip in the test component, and then take this thickness as the maximum penetration thickness.

[0045] The size, size, material, etc. of the lead strip and the first cover 150b can be set based on actual needs, and the embodiment of the present application does not limit them.

[0046] In some embodiments, the first cover 150b can be a wedge-shaped carbon steel block, and the lead strip can be placed at the bottom center position of the wedge-shaped carbon steel block.

[0047] The penetration resolution test component in the national standard test body A (such as Test5 in Figure 1Test2) is composed of a group of sinusoidal single-core copper wires and alloy aluminum steps covering the single-core copper wires to test the resolution capability of the security inspection equipment on the single-core copper wires after penetrating the alloy aluminum steps. Since the size of the single-core copper wires is consistent, the resolution capability of the security inspection equipment on objects of different sizes after penetrating the alloy aluminum steps cannot be tested, and in addition, since the alloy aluminum covering the single-core copper wires adopts a step structure, if more thicknesses are to be covered, more steps need to be set, resulting in a large space occupied by the penetration resolution test assembly 160. Based on this, the embodiments of the present application design a penetration resolution test assembly 160, as shown in Figure 9 The penetration resolution test assembly 160 includes a substrate 160a, a plurality of wire-wound rings 160b arranged on the substrate 160a, and a second cover 160c covering the plurality of wire-wound rings 160b, the diameters of the wires in the plurality of wire-wound rings 160b are different, and the thickness of the second cover 160c is continuously gradiently changed, so that the X-rays emitted by the security inspection equipment penetrate the second cover 160c of different thicknesses to reach the plurality of wire-wound rings 160b. By combining the wire-wound rings 160b of different diameters with the second cover 160c of continuously changing thickness, the resolution of the security inspection equipment on objects of different sizes when penetrating objects of different thicknesses can be effectively evaluated, and the penetration resolution of the security inspection equipment can be more comprehensively and accurately evaluated.

[0048] The size, number, and material of the wire-wound rings 160b and the size, material, and shape of the second cover 160c can be set based on actual needs, and the embodiments of the present application do not limit them. In some embodiments, the plurality of wire-wound rings 160b can be wire-wound rings of copper wires of different diameters. In some embodiments, the plurality of wire-wound rings 160b can also be wire-wound rings of lead wires of different diameters

[0049] In some embodiments, the second cover 160c is an aluminum block in the shape of a triangular prism, such as a right triangular prism, which is placed on the plurality of wire-wound rings 160b.

[0050] In some embodiments, since the penetration resolution test assembly 160 is a long strip-shaped test assembly, the corresponding bottom plate area is convenient for opening a hollow to fix a dangerous goods assembly, so a region of the bottom plate 110 shared with the dangerous goods test assembly can be designed, thereby achieving effective use of space. The penetration resolution test assembly can be designed in a detachable structure, for example, the substrate 160a can be fixed to the bottom plate 110 by screws.

[0051] In some embodiments, the testing apparatus further includes a cover plate, with the plurality of test components located between the base plate 110 and the cover plate. The cover plate is detachably connected to the base plate 110 and serves to protect the plurality of test components. For example, the base plate 110 and the cover plate can both be made of PMMA (polymethyl methacrylate) and can be connected in the middle by aluminum alloy sleeve screws.

[0052] To further illustrate the testing apparatus provided in the embodiments of this application, the following explanation is based on a specific embodiment.

[0053] like Figure 3 The diagram shown is a schematic representation of a testing apparatus provided in one embodiment of this application. Figure 10 The image shows a top view of the testing device. The device includes a base plate 110, a cover plate (not shown), and five main testing components located between the base plate 110 and the cover plate. Both the base plate 110 and the cover plate are made of PMMA acrylic and are connected by aluminum alloy sleeve screws for easy disassembly and replacement. The five testing components are: an effective material resolution and material resolution testing component in the upper left corner; a spatial resolution and image distortion testing component in the upper middle position; a mixture and inorganic matter resolution testing component 120 in the upper right corner; a device penetration testing component 150 in the lower left corner; and a penetration resolution testing component in the lower right corner. The penetration resolution testing component is designed as a detachable structure; for example, it can be fixed to the base plate 110 with screws. The base plate 110 area where the penetration resolution testing component is installed has parallel, equally spaced elliptical holes 110a. When the penetration resolution testing component is in the disassembled state, the elliptical holes 110a can be used to fix dangerous goods such as controlled knives, hazardous liquids, and lithium batteries, which are set according to changes in actual scenarios, with cable ties or nylon buckles.

[0054] The effective material resolution and material resolution test assembly 140 is a combined assembly comprising a material resolution test assembly and an effective material resolution test assembly. The material resolution test assembly consists of horizontally placed PVC, polytetrafluoroethylene (PTFE), and polyethylene sheets with different equivalent atomic numbers, each 60 mm long and 30 mm wide, used to test the material resolution capability of the security inspection equipment. The PVC sheet is 9 mm thick with an equivalent atomic number of 14.3; the PTFE sheet is 22 mm thick with an equivalent atomic number of 8.5; and the polyethylene sheet is 25 mm thick with an equivalent atomic number of 5.53. The effective material resolution test assembly consists of stainless steel SUS304 and the aforementioned material resolution test assembly. Specifically, a steel step with a length of 20 mm, a width of 100 mm, and thicknesses of 2 mm and 1 mm, respectively, is vertically stacked on top of the material resolution test assembly. This is used to test the security inspection equipment's ability to resolve materials after X-rays pass through the thin steel step.

[0055] The spatial resolution and image distortion test component is composed of a square copper plate with a side length of 100 mm and a thickness of 2 mm. The square copper plate is cut with 4 groups of line-shaped holes with different widths, each group of line-shaped holes is divided into horizontal and vertical directions, and each direction has 4 groups of line-shaped holes with different widths, the widths are 2 mm, 1.5 mm, 1 mm and 0.8 mm respectively. The outer contour of the square copper plate is used to test the distortion ratio of the horizontal and vertical directions of the image, and the line-shaped holes are used to test the spatial resolution of the device in the horizontal and vertical directions.

[0056] The mixture and inorganic matter resolution test component 120 is composed of an aluminum alloy semi-circular ring ladder and a carbon structural steel Q235 semi-circular ring ladder, both of which have the same size and are combined into a circular ring fixed on the bottom plate 110. The inner diameter of the aluminum semi-circular ring ladder is 40 mm, the outer diameter is 100 mm, and the thickness is 1 mm, 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm and 16 mm respectively, which are divided into eight regions for testing the resolution of the security inspection equipment to the mixture; the inner diameter of the carbon structural steel Q235 semi-circular ring ladder is 40 mm, the outer diameter is 100 mm, and the thickness is 0.5 mm, 0.8 mm, 1 mm, 2 mm, 3 mm, 4 mm, 6 mm and 8 mm respectively, which are divided into eight regions for testing the resolution of the security inspection equipment to the inorganic matter.

[0057] The penetration test component 150 is composed of a carbon structural steel Q235 wedge-shaped block and a lead strip, the wedge-shaped block is 120 mm long, 55 mm wide, the thickest part is 45 mm thick, and the thinnest part is 20 mm thick, the lead strip is located at the center of the bottom of the wedge-shaped block, which is 120 mm long, 10.4 mm wide and 5 mm high. The equivalent penetration of the security inspection equipment is evaluated by calculating the half-value layer thickness of the carbon structural steel and the clarity of the lead strip.

[0058] The penetration resolution test component 160 includes a substrate 160a, 5 copper wire rings with different inner diameters arranged on the substrate 160a, and an aluminum right triangular prism placed above the copper wire rings. The right triangular prism is placed above the copper wire rings, so that the X-ray needs to penetrate the continuously changing thickness to reach the inner copper wire ring. The substrate 160a is a PMMA acrylic plate with a length of 160 mm, a width of 55 mm and a height of 4 mm. The inner diameter of the copper wire ring is 25 mm, and the diameter of the inner copper wire is 0.511 mm, 0.320 mm, 0.203 mm, 0.127 mm and 0.0787 mm from left to right. The aluminum triangular prism is 160 mm long, 27.5 mm wide and 20 mm high. The penetration resolution of the security inspection equipment is evaluated by testing the X-ray penetration resolution of the security inspection equipment through the aluminum block.

[0059] The test device provided by the embodiment of the application can cover the detection of various performance indexes of the security inspection equipment, has high integration, and through optimization of the structure of various test components, the test device has smaller volume and weight while ensuring the test precision of various performance indexes, can realize light weight, and is more convenient for users to use.

[0060] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The specification and examples given are considered exemplary only, and the true scope and spirit of the application is indicated by the following claims.

[0061] It should be understood that the present application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the present application. The scope of the present application is limited only by the appended claims.

[0062] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A test device for testing imaging quality of a security inspection device, characterized in that, The test device comprises a base plate and a plurality of test components arranged on the base plate, the plurality of test components at least comprising: an effective material resolution and material resolution test component, a spatial resolution and image distortion test component, a mixture and inorganic material resolution test component, a penetration power test component, and a penetration resolution test component, wherein the mixture and inorganic material resolution test component comprises two annular steps, one of which is a mixture material annular step for detecting the resolution capability of the security inspection equipment on the mixture, and the other is an inorganic material annular step for detecting the resolution capability of the security inspection equipment on the inorganic material.

2. The test device of claim 1, wherein, The two annular steps are two half-circular annular steps which are fixed on the base plate and combined into a circular annulus. And / or The mixture material annular step is an aluminum alloy annular step, and the inorganic material annular step is a carbon steel annular step.

3. The test device of claim 1, wherein, The plurality of test components comprises at least one detachable test component.

4. The test device of claim 3, wherein, The at least one detachable test component is installed in a designated area of the base plate, and an opening is arranged in the designated area, which can be used to fix a dangerous goods test component when one of the detachable test components is in a detached state.

5. The test device of claim 1, wherein, The penetration power test component comprises a lead strip and a first cover arranged above the lead strip, and the thickness of the first cover changes continuously in a gradient manner, so that the X-ray of the security inspection equipment penetrates the first cover with different thicknesses to reach the lead strip.

6. The test device of claim 5, wherein, The first cover is a wedge-shaped carbon steel block.

7. The test device of claim 1, wherein, The penetration resolution test component comprises a substrate, a plurality of circular rings formed by metal wires arranged on the substrate, and a second cover arranged above the plurality of circular rings, the diameters of the plurality of circular rings are different, and the thickness of the second cover changes continuously in a gradient manner, so that the X-ray of the security inspection equipment penetrates the second cover with different thicknesses to reach the plurality of circular rings.

8. The test device of claim 7, wherein, The at least one detachable test component comprises the penetration resolution test component; and / or The second cover is a triangular prism-shaped aluminum block.

9. The test device of claim 1, wherein, The spatial resolution and image distortion test component comprises a regular-shaped object, and a plurality of horizontal linear holes and a plurality of vertical linear holes are arranged on the surface of the regular-shaped object, the widths of the plurality of horizontal linear holes are different, the widths of the plurality of vertical linear holes are different, the outer contour of the regular-shaped object is used to detect the distortion of the security inspection image collected by the security inspection equipment, and the linear holes are used to detect the spatial resolution of the security inspection equipment.

10. The test device of claim 1, wherein, The effective material resolution and material resolution test component comprises a steel step and at least two test plates stacked on the steel step, and a part of each test plate overlaps with the steel step, wherein the equivalent atomic numbers of the at least two test plates are different, and the equivalent atomic numbers of the at least two test plates are smaller than the equivalent atomic number of the steel step.

11. The test device of claim 1, wherein, The test device further comprises a cover plate, the plurality of test components are located between the bottom plate and the cover plate, the cover plate is detachably connected with the bottom plate, and the plurality of test components are protected.

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