CN218974226U - Article security inspection imaging system - Google Patents
Article security inspection imaging system Download PDFInfo
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- CN218974226U CN218974226U CN202223533221.4U CN202223533221U CN218974226U CN 218974226 U CN218974226 U CN 218974226U CN 202223533221 U CN202223533221 U CN 202223533221U CN 218974226 U CN218974226 U CN 218974226U
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Abstract
The utility model discloses an object security inspection imaging system, and belongs to the technical field of security inspection; the technical problem of low scanning speed caused by the limitation of the rotating speed of the rotating frame of the existing spiral CT is solved. The imaging system comprises an inlet end ray source, an outlet end ray source, an inlet end detector and an outlet end detector; the inlet end ray source and the inlet end detector are arranged on the inlet end conveyor belt, and the outlet end ray source and the outlet end detector are arranged on the outlet end conveyor belt; the combined action of the ray source at the inlet end and the ray source at the outlet end can cover the detection range of the whole conveyor belt; the inlet end detector and the outlet end detector cooperate to detect the detection range of the whole conveyor belt. According to the utility model, the tomographic image of the object can be obtained quickly, and the internal information of the scanned object is finally obtained by obtaining the tomographic image of the object to carry out quick imaging.
Description
Technical Field
The utility model relates to the technical field of article security inspection, in particular to an imaging system for article security inspection.
Background
X-rays have found wide application in security inspection applications. The X-ray security inspection equipment commonly used at present mainly comprises a security inspection machine and a security inspection CT. The security inspection CT can acquire three-dimensional information of luggage articles, and has special advantages compared with the problem of article shielding in two-dimensional imaging of a security inspection machine. In particular to a dual-energy CT device, dangerous objects such as explosives are distinguished by acquiring the atomic number and electron density information of the objects.
However, the current security inspection CT mainly adopts a spiral scanning mode, and solves the problem of continuous rotation of the frame through a slip ring. However, because the rack is provided with the devices such as the radiation source, the detector and the like, the rotating speed of the rack is difficult to be greatly improved, and the rotating speed commonly used at present is 2-4 circles/second. The fastest belt speed of the conventional security inspection CT is about 0.5m/s, the quality of the reconstructed image is obviously reduced due to the large pitch, so that the requirement of high-speed security inspection cannot be met, and noise caused by rotation is difficult to eliminate.
Disclosure of Invention
In view of the above analysis, the present utility model aims to provide an object security inspection imaging system, which is used for solving the technical problem of slow scanning speed caused by the rotation speed limitation of the rotating gantry in the existing spiral CT.
The aim of the utility model is mainly realized by the following technical scheme:
the utility model provides an object security inspection imaging system, which comprises an inlet end ray source, an outlet end ray source, an inlet end detector and an outlet end detector; the inlet end ray source and the inlet end detector are arranged on the inlet end conveyor belt, and the outlet end ray source and the outlet end detector are arranged on the outlet end conveyor belt;
the combined action of the ray source at the inlet end and the ray source at the outlet end can cover the detection range of the whole conveyor belt; the inlet end detector and the outlet end detector cooperate to detect the detection range of the whole conveyor belt.
In one possible design, the system further comprises an inlet end visible light source and an outlet end visible light source; the inlet end visible light source is arranged above the inlet end detector, and the outlet end detector is arranged above the outlet end detector.
In one possible design, the system further comprises a controller; the controller is respectively connected with the inlet end ray source, the outlet end ray source, the inlet end conveyor belt and the outlet end conveyor belt in a control way.
In one possible design, the system further comprises a microprocessor; the microprocessor is in control connection with the inlet end detector, the outlet end detector and the controller.
In one possible design, a rotation mechanism is also included; the rotating mechanism is arranged between the inlet end detector and the outlet end detector; the rotating mechanism is used for driving the detected object to rotate by a certain angle.
In one possible design, the rotation mechanism includes a rotary motor and a rotary platform;
the rotating platform and the conveyor belt are mutually independent; the rotary platform is connected with a rotary motor, and the rotary motor can drive the rotary platform to rotate.
In one possible design, the rotation mechanism drives the detected object to rotate by an angle of 70-110 degrees.
In one possible design, the rotation mechanism drives the detected object to rotate by 80-100 degrees.
In one possible design, the inlet detector and the outlet detector are each one of a single energy detector, a sandwich detector, a linear array detector, or an area array detector.
In one possible design, the system further comprises an inlet digital camera and an outlet digital camera, wherein the inlet digital camera is arranged above the inlet conveyor belt, and the outlet digital camera is arranged above the outlet conveyor belt.
Compared with the prior art, the utility model has at least one of the following beneficial effects:
(1) According to the utility model, the rotating mechanism is arranged, and can drive the article to rotate for a certain angle, so that a tomographic image of the article can be obtained; and (3) carrying out rapid imaging by obtaining a tomographic image of the object, and finally obtaining the internal information of the scanned object.
(2) The rotating mechanism comprises the rotating platform and the rotating motor, a high-speed rotating component is not required to be arranged, and the system mechanism is relatively simple.
(3) The inlet end ray source, the outlet end ray source, the inlet end detector and the outlet end detector of the imaging system do not need to do rotary motion, so that the installation cost is greatly reduced, and the security inspection efficiency of articles is improved.
In the utility model, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the embodiments of the utility model particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the utility model, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 is a schematic diagram of the composition of an item security inspection imaging system of the present utility model;
FIG. 2 is a top view of a sparse arrangement of pixels of an entrance end detector and an exit end detector;
FIG. 3 is a schematic view of a linear tomography scan according to the present utility model;
fig. 4 is a schematic view of a projection data range during linear tomography according to the present utility model.
Reference numerals:
1-an inlet end radiation source; 2-an inlet end detector; 3-an outlet end ray source; 4-an outlet end detector; 5-inlet end article; 6-exit end article; 7-an inlet end conveyor belt; 8-an outlet end conveyor belt; 9-a controller; 10-a microprocessor; 11-an inlet end visible light source; 12-an inlet digital camera; 13-an outlet end visible light source; 14-an exit digital camera; 15-a rotation mechanism.
Detailed Description
The following detailed description of preferred embodiments of the utility model is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the utility model, are used to explain the principles of the utility model and are not intended to limit the scope of the utility model.
The utility model provides an article security inspection imaging system, as shown in figure 1, which comprises an inlet end ray source 1, an outlet end ray source 3, an inlet end detector 2 and an outlet end detector 4; wherein the inlet end ray source 1 and the inlet end detector 2 are close to the inlet end conveyor belt, the outlet end ray source 3 and the outlet end detector 4 are close to the outlet end conveyor belt, and the rotating mechanism 15 is arranged at the middle position of the conveyor belt, namely between the inlet end conveyor belt 7 and the outlet end conveyor belt.
It should be emphasized that the combined action of the inlet-side radiation source 1 and the outlet-side radiation source 3 can cover the detection range of the whole conveyor belt; likewise, the entrance end detector 2 and the exit end detector 4 cooperate to cover the detection range of the entire conveyor belt.
It should be noted that, as shown in fig. 2, the inlet end detector 2 and the outlet end detector 4 are both sparse detectors or conventional detectors. Wherein the detector units in the conventional detector are arranged at equal intervals, and the scintillator used by each detector unit is the same area. Whereas in sparse detectors the detector elements are non-equally spaced, e.g. the detector elements are positioned closer together in the center of the detector and are positioned relatively loose at the edges to reduce the material costs of the detector construction.
Compared with the prior art, the utility model realizes tomography by using the layout of the double-ray source and the double detectors, thereby realizing detection of the detected object.
The imaging system of the utility model further comprises a rotation mechanism 15 arranged in the middle of the conveyor belt (i.e. between the entrance conveyor belt and the exit conveyor belt 8), the selection mechanism being arranged to rotate the inspected object by a certain angle.
According to the utility model, only the detected object is rotated through the rotating mechanism 15, so that the cost and complexity of an imaging system are reduced; meanwhile, the utility model can realize tomography and improve the precision of an imaging system.
In order to realize the rotation of the articles, the rotating mechanism 15 comprises a rotating motor and a rotating platform, wherein the rotating platform is arranged between the conveying belt 7 at the inlet end and the conveying belt at the outlet end, and the rotating platform and the conveying belt are mutually independent and do not influence the normal operation of each other; the rotary platform is connected with the rotary motor, and the rotary motor can drive the rotary platform to rotate a certain angle, and articles conveyed by the inlet end conveyor belt move to the rotary platform by means of inertia of horizontal movement, then the rotary platform drives the rotary platform to rotate a certain angle, so that gesture change is realized, and finally the articles move to the next imaging view.
The imaging unit formed by the outlet end ray source 3 and the outlet end detector 4 has a larger gap between the angle position information corresponding to the acquired data of the object and the imaging unit formed by the front inlet end ray source 1 and the inlet end detector 2, so that the angle of the acquired data can be greatly increased.
The rotation mechanism 15 can rotate the object to be inspected by a certain angle, and the rotation angle is in the range of 70-110 °. For example, the rotation angle is 80-10 °.
Specifically, the detected article at the inlet end (inlet end article 5 for short) is moved onto the rotating mechanism 15 by the action of the conveyor belt, the detected article is rotated by 70-110 ° by the rotation of the rotating mechanism 15, the detected article after being rotated is defined as the outlet end article 6, and the outlet end article 6 is carried to the outlet end conveyor belt 8 by the conveyor belt.
Compared with the prior art, the utility model rotates the article by 70-110 degrees by using the rotating mechanism 15, so that the article has a certain posture change, and the rotation of the angle of the article is easy to realize mechanically.
It should be noted that the inlet detector and the outlet detector 4 are each one of a single-energy detector, a sandwich detector, a linear array detector or an area array detector.
The inlet end detector 2 and the outlet end detector 4 of the present utility model are both disposed horizontally.
The imaging system of the utility model also comprises an inlet digital camera 12 and an outlet digital camera 14, wherein the inlet digital camera 12 is arranged above the inlet conveyor belt, and the outlet digital camera 14 is arranged above the outlet conveyor belt, and both the inlet digital camera 12 and the outlet digital camera 14 are used for acquiring the gesture of the detected object.
The imaging system of the present utility model further comprises a controller 9, which controller 9 is in control connection with the inlet end radiation source 1, the outlet end radiation source 3, the inlet end conveyor belt 7 and the outlet end conveyor belt 8, respectively.
The imaging system of the present utility model further comprises a microprocessor 10, the microprocessor 10 being in control connection with the inlet end detector 2, the outlet end detector 4, the inlet end digital camera 12, the outlet end digital camera 14 and the controller 9.
The imaging system of the present utility model further comprises an entrance end visible light source 11 and an exit end visible light source 13, both of which are used to illuminate the conveyor belt and are capable of illuminating the entire conveyor belt. The rotation angle of the article is obtained by registering the visible light images corresponding to the inlet-end visible light source 11 and the outlet-end visible light source 13.
The rotation mechanism 15 is disposed at a middle position of the conveyor belt, and the inlet-end radiation source 1 and the inlet-end detector 2 and the outlet-end radiation source 3 and the outlet-end detector 4 are disposed at both sides of the rotation mechanism 15, respectively.
The imaging system of the utility model has the working procedures that: placing the detected object on a conveyor belt, and enabling the conveyor belt to perform uniform linear motion under the control of a controller 9 so as to drive the detected object to move forwards; firstly, the detected object enters an inlet end ray detection area formed by an inlet end ray source 1 and an inlet end detector 2, and projection data acquired in the area is equivalent to parallel beam projection data in a certain angle range; as shown in fig. 3, if the opening angle of the inlet-end ray source 1 is θ, the angle range of the obtained parallel beam projection data is also θ; when the detected object runs below the inlet end digital camera 12, a visible light image of the detected object is acquired; then the detected object rotates 70-110 degrees under the action of the rotating mechanism 15; after the detected object is rotated, it is then transferred into an exit-side radiation detection area consisting of an exit-side radiation source 3 and an exit-side detector 4, where the acquired projection data is equivalent to parallel beam projection data over a range of angles. As shown in fig. 3 and 4, if the opening angle of the exit-side radiation source 3 is θ, the angle range of the obtained parallel beam projection data is also θ. When the object runs below the outlet end digital camera 14, a visible light image of the detected object is acquired; and obtaining the rotating angle number of the detected object by using the two visible light images of the detected object and utilizing the existing image registration method. Combining the parallel beam projection data within the limited angle range (realized by a conventional data combining method), reconstructing faults of the object by using the conventional iterative reconstruction algorithm to obtain electron density and atomic number information, and judging the safety attribute of the detected substance according to the electron density and the atomic number information.
The existing spiral ct security inspection device realizes the spiral movement of articles by horizontally moving a rotating frame and a conveyor belt, and the articles such as a ray source, a detector and the like of the spiral ct security inspection device are required to be arranged on the rotating frame, so that the problem of dynamic balance caused by rotation is required to be considered. Furthermore, slip rings are required to solve the problem of continuous rotation of the gantry. The data and electrical signals are passed between the rotating gantry and the stationary part through electrical, optical or radio frequency links on the slip ring.
Compared with the prior art, the imaging system has the advantages that the inlet end ray source 1, the outlet end ray source 3, the inlet end detector 2 and the outlet end detector 4 do not need to do rotary motion, so that the installation cost is greatly reduced.
The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model.
Claims (10)
1. An article security inspection imaging system, comprising an inlet end ray source, an outlet end ray source, an inlet end detector and an outlet end detector; the inlet end ray source and the inlet end detector are arranged on the inlet end conveyor belt, and the outlet end ray source and the outlet end detector are arranged on the outlet end conveyor belt;
the combined action of the inlet end ray source and the outlet end ray source can cover the detection range of the whole conveyor belt; the inlet end detector and the outlet end detector can jointly act to detect the detection range of the whole conveyor belt.
2. The item security inspection imaging system of claim 1 further comprising an inlet end visible light source and an outlet end visible light source; the inlet end visible light source is arranged above the inlet end detector, and the outlet end detector is arranged above the outlet end detector.
3. The item security inspection imaging system of claim 2, further comprising a controller; the controller is respectively connected with the inlet end ray source, the outlet end ray source, the inlet end conveyor belt and the outlet end conveyor belt.
4. The item security inspection imaging system of claim 3, further comprising a microprocessor; the microprocessor is in control connection with the inlet end detector, the outlet end detector and the controller.
5. The item security inspection imaging system of claim 4 further comprising a rotation mechanism; the rotating mechanism is arranged between the inlet end detector and the outlet end detector; the rotating mechanism is used for driving the detected object to rotate.
6. The item security inspection imaging system of claim 5 wherein the rotation mechanism comprises a rotary motor and a rotary platform;
the rotary platform and the conveyor belt are mutually independent; the rotary platform is connected with the rotary motor, and the rotary motor can drive the rotary platform to rotate.
7. The article security inspection imaging system of claim 6 wherein the rotation mechanism rotates the inspected article by an angle of between 70 ° and 110 °.
8. The article security inspection imaging system of claim 7 wherein the rotation mechanism rotates the inspected article by an angle of 80 ° to 100 °.
9. The article security inspection imaging system of any of claims 1 to 8 wherein the inlet end detector and the outlet end detector are each one of a unienergy detector, a sandwich detector, a linear array detector or an area array detector.
10. The article security inspection imaging system of claim 9 further comprising an entrance end digital camera and an exit end digital camera, the entrance end digital camera being positioned above the entrance end conveyor and the exit end digital camera being positioned above the exit end conveyor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223533221.4U CN218974226U (en) | 2022-12-29 | 2022-12-29 | Article security inspection imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223533221.4U CN218974226U (en) | 2022-12-29 | 2022-12-29 | Article security inspection imaging system |
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| Publication Number | Publication Date |
|---|---|
| CN218974226U true CN218974226U (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223533221.4U Active CN218974226U (en) | 2022-12-29 | 2022-12-29 | Article security inspection imaging system |
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| Country | Link |
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| CN (1) | CN218974226U (en) |
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- 2022-12-29 CN CN202223533221.4U patent/CN218974226U/en active Active
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