CN116931104A - Three-dimensional spatial resolution test body and method for security inspection equipment - Google Patents
Three-dimensional spatial resolution test body and method for security inspection equipment Download PDFInfo
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- CN116931104A CN116931104A CN202210372500.2A CN202210372500A CN116931104A CN 116931104 A CN116931104 A CN 116931104A CN 202210372500 A CN202210372500 A CN 202210372500A CN 116931104 A CN116931104 A CN 116931104A
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- 238000012360 testing method Methods 0.000 title claims abstract description 89
- 238000007689 inspection Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 13
- 239000010949 copper Substances 0.000 claims description 13
- 238000003384 imaging method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002591 computed tomography Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Pulmonology (AREA)
- Radiology & Medical Imaging (AREA)
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention provides a three-dimensional spatial resolution test body and method of security inspection equipment, belongs to the technical field of security inspection equipment testing, and is mainly used for testing the quality of three-dimensional images of the security inspection equipment. The three-dimensional spatial resolution test body of the security inspection equipment comprises a test body, wherein the test body comprises a plurality of hollow cylinders which are coaxially arranged and have the same height and the same inner diameter; the outer diameter of each hollow cylinder is sequentially increased in the direction along the central axis; a plurality of sets of slotted holes are arranged on the cylindrical surface of each hollow cylinder. The three-dimensional space resolution test body of the security inspection equipment has good stability, can intuitively judge the three-dimensional space resolution of the CT type security inspection equipment, and represents the three-dimensional image quality of the CT type security inspection equipment.
Description
Technical Field
The invention belongs to the technical field of security inspection equipment testing, and particularly relates to a three-dimensional spatial resolution test body and method of security inspection equipment.
Background
The security inspection device is applied to public places such as airports, customs, prisons and ports, the existing security inspection device for performing security inspection by utilizing X-rays is generally two-dimensional imaging equipment, and two-dimensional images are displayed in display equipment of the security inspection device, so that shape judgment of some inspected objects in the security inspection is not accurate enough. In order to more accurately judge the inspected articles, CT type security inspection equipment is developed. The CT type security inspection equipment forms a three-dimensional reconstruction image for the inspected object by utilizing the X-ray computed tomography principle, and provides the internal structural characteristics of the inspected object for the image identification of the security inspector.
The security inspection needs to identify each article of the inspected content more accurately according to the shape and position information of the inspected article. For CT type security check equipment, three-dimensional image quality is an important basis for evaluating equipment capacity, and the current security check equipment test body is only suitable for two-dimensional X-ray security check equipment and cannot test imaging quality of the CT type security check equipment. At present, although the security inspection equipment is formally in a use state, whether the imaging of the detected object is accurate or not cannot be judged, and the security inspection equipment is an urgent problem to be solved for the security inspection field related to social stability and resident security.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a three-dimensional spatial resolution test body of a security inspection device, which scientifically and intuitively tests the three-dimensional image quality of the CT type security inspection device, and comprises a test body, wherein the test body comprises a plurality of hollow cylinders which are coaxially arranged and have the same height and inner diameter;
the outer diameter of each hollow cylinder is sequentially increased in the direction along the central axis;
a plurality of sets of slotted holes are arranged on the cylindrical surface of each hollow cylinder.
Wherein, 3 sets of slotted holes are arranged on each hollow cylinder, and the 3 sets of slotted holes are distributed in an included angle of 120 degrees on the circumference perpendicular to the central axis of the hollow cylinder;
the slotted hole is a strip-shaped slot formed on the hollow cylinder;
each set of slots comprises 1 group of transverse slots and 1 group of vertical slots;
the plane of the central line of each transverse slot hole is perpendicular to the central axis of the hollow cylinder, and the central line of each vertical slot hole is parallel to the central axis of the hollow cylinder.
Wherein, for the same hollow cylinder, the width of the horizontal slot and the vertical slot on the hollow cylinder is the same, and the distance between the adjacent slots in each group of slots is the same as the width of the slots.
Wherein, the lengths of all slotted holes on all hollow cylinders on the test body are the same.
The test body is made of copper tubes.
Wherein the width of the slotted hole is 0.8mm-2.4mm.
The test body is packaged in an inner cavity of the cuboid acrylic box body.
The two ends of the length direction of the testing body are respectively fixed with a pair of brackets, the straight line of each bracket is perpendicular to the central axis of the copper pipe, the brackets are symmetrically arranged on two sides of the central axis of the copper pipe, two ends of each pair of brackets are respectively and fixedly installed on two opposite plates of the cuboid acrylic box body, and the testing body is fixedly supported in the cuboid acrylic box body through the brackets.
The invention also provides a method for testing the CT type security inspection equipment by using the three-dimensional spatial resolution test body of the security inspection equipment, which comprises the following operation steps:
the first step: placing a three-dimensional spatial resolution test body of the security inspection equipment at the bottom center position of a conveying device of the CT security inspection equipment;
and a second step of: operating the CT type security inspection equipment and scanning a three-dimensional space resolution test body of the whole security inspection equipment;
and a third step of: the tester directly views the three-dimensional image of the test body on the display screen of the display device, distinguishes the transverse slotted hole and the longitudinal slotted hole, and finds the slotted hole with the minimum specification capable of forming a clear grid image, wherein the slot width of the slotted hole is the three-dimensional spatial resolution value of the CT type security inspection device for testing.
In the first step, the central axis of the test body is parallel to the running direction of the conveying device.
Compared with the prior art, the invention has the beneficial effects that:
the three-dimensional space resolution test body of the security inspection device adopts a hollowed-out groove design, is obvious in imaging on a CT image, has no mutual interference between transverse and longitudinal groove holes which are uniformly arranged, is convenient for a tester to judge the image, and has better image distinction degree.
The three-dimensional spatial resolution test body of the security inspection device has the advantages of simple structure, stable material, long-time storage, multiple frequency use and difficult damage.
The three-dimensional space resolution test body of the security inspection equipment has good stability, can intuitively judge the three-dimensional space resolution of the CT type security inspection equipment, and represents the three-dimensional image quality of the CT type security inspection equipment.
Drawings
FIG. 1 is a schematic diagram of a test procedure of a test body according to the present invention.
FIG. 2 is a schematic perspective view of a test body according to the present invention;
FIG. 3 is an image of a test body displayed on a display device during a test;
FIG. 4 is a plan expanded view of the test body of the present invention;
FIG. 5 is a schematic view of the structure of the test body mounting bracket of the present invention.
Detailed Description
The present invention is described in detail below with reference to specific embodiments, and it should be noted that the following embodiments are only for further description of the present invention and should not be construed as limiting the scope of the present invention, and some insubstantial modifications and adjustments of the present invention by those skilled in the art from the present disclosure are still within the scope of the present invention.
The invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, a three-dimensional spatial resolution test body (simply referred to as a "test body") of the security inspection device is used for testing the three-dimensional spatial resolution of the CT security inspection device, and the three-dimensional spatial resolution of the CT security inspection device characterizes the ability of the security inspection device to judge and distinguish micro detail features of a three-dimensional image. The CT type security inspection equipment generally comprises a security inspection machine and display equipment matched with the security inspection machine, when an object to be detected enters the security inspection machine, a CT scanning line scans the object to be detected, after the object to be detected is scanned and imaged, the image information is displayed in the display equipment, and security inspection personnel perform artificial or machine judgment on the image information to judge whether forbidden objects exist in the object to be detected.
The three-dimensional space resolution test body of the security inspection device comprises a test body 1 and a cuboid acrylic box body (the cuboid acrylic box body is not shown in all of fig. 1-4) for packaging the test body 1, wherein the test body 1 is made of copper pipes, the inner diameter of each copper pipe is 50-150 mm, 70mm is preferably selected, the outer diameter of each copper pipe is gradually increased in a step-like manner, namely the test body 1 comprises a plurality of hollow cylinders with the same height, the same inner diameter and sequentially increased outer diameters, and the outer diameters of the hollow cylinders can be 71.6mm,72mm,72.6mm,73.2mm,74mm and 74.8mm respectively; the central axes of the plurality of hollow cylinders are in a straight line.
The length of each step of the test body 1 (i.e. the height of the hollow cylinder) ranges from 20mm to 70mm, preferably 45mm. As shown in fig. 3, the hollow cylinder of each step of the test body 1 is distributed with a transverse slot and a vertical slot, the plane of the central line of each transverse slot is perpendicular to the central axis of the hollow cylinder, and the central line of each vertical slot is parallel to the central axis of the hollow cylinder. In this embodiment, 3 sets of slots are disposed on the hollow cylinder of each step, the slots are strip slots formed on the hollow cylinder, the slots penetrate through the inner and outer walls of the hollow cylinder, each set of slots includes 1 set of transverse slots and 1 set of vertical slots, and the 3 sets of slots are distributed at 120-degree included angles on the circumference perpendicular to the central axis of the hollow cylinder, i.e. 120-degree intervals are formed between the central lines of the vertical slots in the three sets of slots. For the same hollow cylinder, the slot widths of the vertical slots and the horizontal slots on the same hollow cylinder are the same, and the distance between the slots is the same as the hole width of the slots, namely, the distance between the adjacent slots in each group of slots is the same as the hole width of the slots, because the slot widths are indexes of the three-dimensional spatial resolution of the security inspection equipment, the same slot widths of all slots on the same hollow cylinder and the same distance between the adjacent slots in each group of slots are beneficial to extracting the slot width values to determine the three-dimensional spatial resolution values of the security inspection equipment. Along with the increment of the outer diameter of the hollow cylinder, the groove width of the groove hole on the hollow cylinder is also incremented, the groove width of the groove hole is 0.8-2.4mm, and the groove widths of the groove holes on 6 hollow cylinders can be 0.8mm,1mm,1.3mm,1.6mm,2mm and 2.4mm in sequence; the lengths of all slots on all hollow cylinders on the test body 1 are the same, and the range of values is 10mm to 50mm, preferably 25mm. In this embodiment, the three-dimensional spatial resolution of the CT-type security inspection apparatus is defined as the capability of the CT-type security inspection apparatus to resolve slots, and is represented by the slot widths of the slots, and the higher the three-dimensional spatial resolution of the CT-type security inspection apparatus, the clearer the displayed image of the object.
As shown in fig. 5, further, the test body 1 is packaged by adopting a cuboid acrylic box body assembled by acrylic plates, and the cuboid acrylic box body is assembled by six acrylic plates through adhesion or other known fixed connection modes, and the specific packaging structure is as follows: as shown in fig. 5, a pair of brackets 2 are respectively fixed at two ends of the length direction of the test body 1, and the brackets 2 can be metal rods, metal tubes or rods and tubes made of other materials; the support 2 passes through the copper pipe, the straight line where the support 2 is located is perpendicular to the central axis of the copper pipe, and the support 2 is symmetrically arranged on two sides of the central axis of the copper pipe. Two ends of the two pairs of brackets 2 are respectively and fixedly arranged on two opposite plates of the cuboid acrylic box body, and the test body 1 is fixedly supported in the cuboid acrylic box body through the brackets 2. The density and atomic number difference of the acrylic packaging plate material and the copper wire material are large, the contrast ratio in CT images is large, the resolution is easy, the identification of the copper wires is not affected, and the packaging structure can play a role in fixing and protecting the test body 1.
The process of testing CT type security inspection equipment by a security inspection equipment three-dimensional space resolution test body comprises the following operation steps:
the first step: placing a three-dimensional spatial resolution test body of security inspection equipment at the bottom center position of a conveying device of a security inspection machine, and enabling the central axis of the test body 1 to be parallel to the running direction of the conveying device;
and a second step of: running a CT type security inspection device and scanning a three-dimensional space resolution test body of the whole CT type security inspection device;
and a third step of: the tester directly views the three-dimensional image of the test body on the display screen of the display device to distinguish the transverse slot and the longitudinal slot, as shown in fig. 2, rotates the three-dimensional image to select the angle to enable the current slot and the opposite slot to form the grid image shown in fig. 3, finds the minimum specification slot capable of forming a clear grid image, and the slot width value of the slot is the three-dimensional space resolution value of the security inspection device to be tested, so that the transverse slot and the longitudinal slot of the clear grid image are required to be clear and uninterrupted, and parallel lines are not adhered. As shown in fig. 3, the slots of the first two hollow cylinders on the right cannot form a complete slot image, and the complete slots can be clearly seen on the third hollow cylinder on the right, which is the minimum-specification slot that can be clearly seen, so the slot width value of the slots on the third hollow cylinder on the right is the three-dimensional spatial resolution value of the CT-type security inspection device under test.
In the first step described above, the purpose of requiring the central axis of the test body 1 to be parallel to the direction of travel of the conveyor is two: 1. the accurate groove width value is convenient to read in the test process; 2. to ensure consistency of test results for repeated tests.
The above description is only for the realization of embodiments of the invention, and it should be understood by those skilled in the art that any modification or partial replacement without departing from the scope of the invention shall fall within the scope of the invention as defined in the claims, and the protection scope of the invention shall be subject to the claims.
Claims (10)
1. The utility model provides a three-dimensional space resolution power test body of security inspection equipment, includes the test body, its characterized in that: the test body comprises a plurality of hollow cylinders which are coaxially arranged and have the same height and the same inner diameter;
the outer diameter of each hollow cylinder is sequentially increased in the direction along the central axis;
a plurality of sets of slotted holes are arranged on the cylindrical surface of each hollow cylinder.
2. The security inspection device three-dimensional spatial resolution test body according to claim 1, wherein: 3 sets of slotted holes are formed in each hollow cylinder, and the 3 sets of slotted holes are distributed in an included angle of 120 degrees on the circumference perpendicular to the central axis of the hollow cylinder;
the slotted hole is a strip-shaped slot formed on the hollow cylinder;
each set of slots comprises 1 group of transverse slots and 1 group of vertical slots;
the plane of the central line of each transverse slot hole is perpendicular to the central axis of the hollow cylinder, and the central line of each vertical slot hole is parallel to the central axis of the hollow cylinder.
3. The security inspection device three-dimensional spatial resolution test body according to claim 2, wherein: for the same hollow cylinder, the widths of the transverse slots and the vertical slots on the hollow cylinder are the same, and the distance between the adjacent slots in each group of slots is the same as the width of the slots.
4. A security inspection apparatus three-dimensional spatial resolution test body according to claim 3, characterized in that: the lengths of all slotted holes on all the hollow cylinders on the test body are the same.
5. The security inspection device three-dimensional spatial resolution test body according to claim 4, wherein: the test body is made of copper tubes.
6. The security inspection device three-dimensional spatial resolution test body according to claim 5, wherein: the width of the slotted hole is 0.8mm-2.4mm.
7. The security inspection device three-dimensional spatial resolution test body according to claim 6, wherein: the test body is packaged in an inner cavity of the cuboid acrylic box body.
8. The security inspection device three-dimensional spatial resolution test body according to claim 7, wherein: the test body is characterized in that a pair of brackets are respectively fixed at two ends of the length direction of the test body, the straight line of each bracket is perpendicular to the central axis of the copper pipe, the brackets are symmetrically arranged at two sides of the central axis of the copper pipe, two ends of each pair of brackets are respectively and fixedly mounted on two opposite plates of the cuboid acrylic box body, and the test body is fixedly supported in the cuboid acrylic box body through the brackets.
9. A method for testing CT type security inspection equipment by a three-dimensional spatial resolution test body of the security inspection equipment comprises the following operation steps:
the first step: placing a three-dimensional spatial resolution test body of the security inspection equipment at the bottom center position of a conveying device of the CT security inspection equipment;
and a second step of: operating the CT type security inspection equipment and scanning a three-dimensional space resolution test body of the whole security inspection equipment;
and a third step of: the tester directly views the three-dimensional image of the test body on the display screen of the display device, distinguishes the transverse slotted hole and the longitudinal slotted hole, and finds the slotted hole with the minimum specification capable of forming a clear grid image, wherein the slot width of the slotted hole is the three-dimensional spatial resolution value of the CT type security inspection device for testing.
10. The method for testing a CT-type security inspection device by using a three-dimensional spatial resolution test body of the security inspection device according to claim 9, wherein: in the first step, the central axis of the test body is parallel to the running direction of the conveying device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210372500.2A CN116931104A (en) | 2022-04-11 | 2022-04-11 | Three-dimensional spatial resolution test body and method for security inspection equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210372500.2A CN116931104A (en) | 2022-04-11 | 2022-04-11 | Three-dimensional spatial resolution test body and method for security inspection equipment |
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| Publication Number | Publication Date |
|---|---|
| CN116931104A true CN116931104A (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210372500.2A Pending CN116931104A (en) | 2022-04-11 | 2022-04-11 | Three-dimensional spatial resolution test body and method for security inspection equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116931104A (en) |
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- 2022-04-11 CN CN202210372500.2A patent/CN116931104A/en active Pending
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