CN214622399U - CT detection device and system - Google Patents
CT detection device and system Download PDFInfo
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- CN214622399U CN214622399U CN202023199187.2U CN202023199187U CN214622399U CN 214622399 U CN214622399 U CN 214622399U CN 202023199187 U CN202023199187 U CN 202023199187U CN 214622399 U CN214622399 U CN 214622399U
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Abstract
The utility model relates to a CT detection device and system relates to CT detection technical field for the image quality of solving CT check out test set is not high, can't satisfy the problem of image concatenation to the requirement of image quality, CT detection device includes: the device comprises a rotating disk, a conveyor belt, a CT detector, a signal transmission antenna, an encoder and a data processing computer; the CT detector surrounds the lower part and two sides of the conveyor belt and is in communication connection with the data processing computer through the signal transmission antenna; the encoder is arranged on the conveyor belt and is in communication connection with the conveyor belt; the number of the signal transmission antennas is two; two of the signal transmission antennas are disposed around the rotating disk; and the signal output end and the signal input end of the two signal transmission antennas are in mutual contact and form a signal transmission line. The utility model discloses can facilitate for the image concatenation.
Description
Technical Field
The utility model relates to a CT detects technical field, especially relates to a CT detection device and system.
Background
The X-ray computed tomography imaging technology (abbreviated as "CT technology") is highly valued and widely used in the field of security inspection because of its own unique advantages.
Most of current security check CT equipment can not stop the belt in the process of detecting packages, and once a safety checker stops the belt, the safety checker needs to move a detected object entering a detection area to the outside of the monitoring area and perform security check again, so that the security check efficiency is reduced. The image stitching technology can solve the above problems, however, because the image quality of most of the CT detection devices is not high, the requirements of image stitching on the image quality cannot be met, and therefore, a set of device needs to be developed urgently to improve the image quality.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing analysis, the present invention is directed to a CT detection apparatus and system, which facilitates image stitching by improving image quality and data accuracy through component setting and structural improvement.
The purpose of the utility model is mainly realized through the following technical scheme:
in a first aspect, an embodiment of the present invention provides a CT detection apparatus, including: the CT detector, the signal transmission antenna and the encoder;
the CT detector surrounds the lower part and two sides of the conveyor belt and is in communication connection with the data processing computer through the signal transmission antenna;
the encoder is arranged on the conveyor belt and is in communication connection with the conveyor belt;
the number of the signal transmission antennas is two;
two of the signal transmission antennas are disposed around the rotating disk;
and the signal output end and the signal input end of the two signal transmission antennas are in mutual contact and form a signal transmission line.
Further, the CT detection apparatus further includes: rotating the disc;
the signal transmission antenna is flexible.
Further, the CT detection apparatus further includes: a motion control computer;
the motion control computer is in communication with the encoder.
Further, the apparatus further comprises: a photosensor;
the photoelectric sensor includes: the conveying belt comprises a signal receiving end and a signal transmitting end, wherein the signal receiving end and the signal transmitting end are oppositely arranged on two sides of the moving direction of the conveying belt.
Further, a gap exists between the detection area of the photoelectric sensor and the detection area of the CT detector.
Further, the signal transmission antenna includes: the plug-in component comprises a plug-in component, a first metal copper foil layer, a base material layer and a second metal copper foil layer;
the plug-in, the upper copper foil wire and the lower copper foil wire are arranged on one surface of the substrate layer;
and the second metal copper foil layer is arranged on the other surface of the substrate layer.
Furthermore, the first metal copper foil layer is composed of an upper copper foil wire and a lower copper foil wire, and the upper copper foil wire and the lower copper foil wire are differential wires.
Further, the second metal copper foil layer includes an upper copper foil wire and a lower copper foil wire, and the upper copper foil wire and the lower copper foil wire are differential wires.
Further, the thickness of the substrate layer is as follows; 0.7mm-1.0 mm; the dielectric constant of the substrate layer is 2.3-2.8.
In a second aspect, an embodiment of the present invention provides a CT detection system, including: a conveyor belt motor, a slip ring motor and the CT detection device of the first aspect. .
The utility model discloses technical scheme can realize one of following beneficial effect:
and 1, the CT detector can acquire the image of the detected object before the belt is stopped, and after the belt is stopped, the conveyor belt is firstly rewound and then moves forwards, so that the CT detector can acquire the image of the detected object again. And finally, the data processing computer carries out image splicing on the two images. The encoder is used for collecting the moving data of the conveyor belt, so that the motion control computer can control the conveyor belt to rewind according to the moving data of the conveyor belt, and therefore the two images have a large enough overlapping area during image splicing.
2. Whether the detected object exists in the detection area of the CT detector is determined through the photoelectric sensor. When the detected object is not in the detection area, the conveying belt does not rewind, but continues to move forwards, so that the security inspection efficiency is further improved.
3. The flexibility of the flexible antenna is utilized, so that the signal output ends and the signal input ends of the two signal transmission antennas are in mutual contact, the signal attenuation is reduced to the maximum extent, the image quality is improved, and the image splicing quality is further ensured.
Additional features and advantages of the invention 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 invention. The objectives and other advantages of the invention will be realized and attained by the structure 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 invention, wherein like reference numerals are used to designate like parts throughout the drawings.
Fig. 1 is a schematic structural diagram of a CT detection system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a two-layer circuit board according to an embodiment of the present invention.
Description of the drawings: 1-a radiation source; 2-rotating the disc; 3-a CT detector; 4-an encoder; 5-a plug-in; 6-a first metallic copper foil layer; 7-a substrate layer; 8-a second metallic copper foil layer; 9-a photosensor; 40-detected object; 50-a conveyor belt; 60-conveyor belt motor; 70-a motion control computer; 80-slip ring motor; 90-data processing computer.
Detailed Description
The following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings, forms a part of this application, and together with the embodiments of the invention, serve to explain the principles of the invention and not to limit its scope.
In the existing CT detection system, the image of the object to be detected can be obtained only when the object to be detected moves at a constant speed in the direction close to the monitoring region. That is, the image of the detected object cannot be obtained once the detected object stops moving or the conveyor belt is rewound or the detected object moves at variable speed. Therefore, once the tape is stopped, the image of the detected object is interrupted inevitably. Obviously, in this scenario, the image stitching technology can solve the above problems well.
In the existing CT detection system, two technical problems need to be overcome to splice the images of the detected object 40 before and after the belt is stopped.
a. It is ensured that the portion of the detection object 40 which is not detected after the stop of the belt enters the detection area at a constant speed in the direction close to the radiation source 1.
b. The quality of the obtained images is ensured, so that the image splicing accuracy is improved, and the spliced images are prevented from being distorted.
To the above problem, an embodiment of the present invention provides a method, as shown in fig. 1, for CT detection, including: a radiation source 1, a rotating disk 2 and a CT detector 3, an encoder 4, a photoelectric sensor 9, a conveyor belt 50, a data processing computer 90, a conveyor belt motor 60, a slip ring motor 80 and a motion control computer 70. Wherein, CT detector 3, encoder 4, data processing computer 90 and signal transmission antenna constitute the detection device of the embodiment of the utility model. The photosensor and signal transmission antenna are not shown in fig. 1.
Wherein, the CT detector is arranged below the conveyor belt and is in communication connection with the data processing computer through a signal transmission antenna. An encoder 4 is disposed on and communicatively coupled to the conveyor belt. The number of the signal transmission antennas is two, and the two signal transmission antennas are arranged around the rotating disk. The signal output end and the signal input end of the two signal transmission antennas are mutually contacted, and form a signal transmission line. The photosensor 9 includes: the signal receiving end and the signal transmitting end are oppositely arranged on two sides of the moving direction of the conveyor belt.
Specifically, for problem a, in the embodiment of the present invention, the cooperation of the encoder 4, the photoelectric sensor 9, the motion control computer 70, and the data processing computer 90 is used to realize the following specific processes:
after the belt is stopped, the belt can move with the detected object for a period of time due to inertia, and the encoder 4 can acquire the moving speed and the moving time of the belt in real time. Meanwhile, the CT detector 3 will acquire the image of the detected object 40 moving at a constant speed in the direction close to the radiation source at the starting time of the time interval as the first image.
To prevent rewinding in the absence of the detected object 40, the data processing computer 90 needs to first determine whether the first image is the same as the background image. If the first image is the same as the background image, indicating that there is no detected object 40 on the conveyor belt 5, the motion control computer 70 generates a conveyor belt advance command to move the conveyor belt 5 in the direction of movement before stopping. The background image is an image corresponding to the conveyor belt without the detection object, and may also be understood as a blank image.
It should be noted that when the first image is the same as the background image, two situations are involved to cause image defects.
In the first case, the detected object is moving in an accelerated manner in the detection zone, which occurs during the uniform movement of the conveyor belt from a standstill to a maximum forward direction.
In the second case, the detected object performs deceleration movement in the detection area, and in this case, after the belt is stopped, the detected object continues to move due to inertia, so that a part of the detected object enters the detection area.
To the first case, in order to prevent that when the conveyer belt accelerates, article get into the detection zone to arouse the incomplete image, in the embodiment of the utility model provides an on the conveyer belt be provided with photoelectric sensor 9. When the photoelectric sensor 9 detects that the detected object passes through, the detected object is indicated to reach the detection area of the CT detector. At this time, the photosensor 9 emits a trigger signal to the radiation source 1 to cause the radiation source 10 to emit a radiation before the detected object reaches the detection region. The photoelectric sensor 9 can also send a prompt signal to the data processing computer 90, and the data processing computer 90 controls the radiation source 10 to emit radiation. The detection area is the detection range of the CT detector on the conveyor belt, and the detected object passes through the detection area of the photoelectric sensor 9 and the detection area of the ray source in sequence when being transmitted in the forward direction.
The photoelectric sensor 9 comprises a signal receiving end and a signal transmitting end, the signal receiving end and the signal transmitting end are respectively arranged on two sides of the moving direction of the conveyor belt, namely two sides of the conveyor belt, one side is the signal transmitting end for transmitting detection signals, the other side is the signal receiving end for receiving detection signals, when the signal receiving end cannot receive or can only receive part of the transmission signals, prompt information is sent out to prompt a detected object to enter a detection area of the photoelectric sensor 9 in a belt stop state. The principle is that when an object to be detected passes through a detection area of the photoelectric sensor 9 on a conveyor belt, a signal emitted by a signal emitting end cannot or partially pass through the object to be detected, and a signal receiving end cannot receive or can only receive part of the emitted signal, so that a difference exists between signal emission and signal reception. In one possible embodiment, the signal transmitting end and the signal receiving end are a laser transmitting end and a laser receiving end.
Specifically, when the distance between the photoelectric sensor 9 and the detection area is S, the forward uniform motion of the detected object 40 on the conveyor belt 5 is v0Wherein the forward uniform motion is v0Normally, the maximum speed is obtained, and the photoelectric sensor 9 will be at t ═ S/v no matter what the current speed of the detected object 40 detected by the encoder 4 is0At this time, the radiation source 10 is triggered to emit radiation to ensure that the detected object emits radiation before reaching the detection region.
To the second case, in order to prevent that the detected article gets into the detection area after the conveyer belt stops to arouse the incomplete image, in the embodiment of the utility model provides an on the conveyer belt be provided with photoelectric sensor 9. When the photoelectric sensor 9 detects that the detected object passes through, the detected object may reach the detection area of the CT detector. At this time, since the tape has been stopped, the photosensor 9 sends a prompt signal to the motion control computer 70, so that the motion control computer 70 sends a prompt signal to generate a tape rewinding instruction according to both the conditions of stopping the tape and the detected article passing through the photosensor 9. Finally, the conveyor 5 executes a conveyor rewind command.
If the first image is different from the background image, indicating that the detected object 40 is on the conveyor belt 5, the motion control computer 70 generates a conveyor belt rewinding command. Finally, the conveyor 5 executes a conveyor rewind command.
For the problem b, two flexible antennas are adopted to surround the rotating disk 2 to form a signal transmission line, and the signal output end and the signal input end of the two flexible antennas are in contact with each other, so that the distance between the signal output end and the signal input end between the two antennas is shortened to the maximum extent, and the signal transmission strength is ensured to the maximum extent.
However, in the prior art, the antenna of the present invention is usually made of Printed Circuit Boards (PCBs). The capacitive coupling antenna made of the PCB has the advantages that: because the PCB pattern has repeatability (reproducibility) and consistency, errors of wiring and assembly are greatly reduced, and the time for maintaining, debugging and checking the antenna is saved. The antenna has the characteristics of capability of being replaced, convenience, precision, miniaturization and the like due to the characteristics of standardization, small volume, light weight and the like in design.
The capacitive coupling antenna made of the PCB has the defect that the PCB is too brittle and is easy to break. Therefore, from the process point of view, the PCB-made capacitively-coupled antenna cannot be made too long, and the length of the PCB-made capacitively-coupled antenna currently on the market is 1.2m, and the total length of the antenna wound on the rotating disk 2 is at least 4 m. This means that signal transmission can be realized only by providing at least three antennas on the rotating disk 2, but providing multiple antennas inevitably increases impedance, thereby increasing the attenuation degree of signals, which is not favorable for image splicing.
From the use perspective, since the capacitively coupled antenna needs to surround the rotating disk 2, even if the capacitively coupled antenna made of PCB board can be made long enough, it is easy to break due to bending and too long length, which causes the strength of the transmitted signal to be attenuated sharply, and even the data processing computer 90 cannot receive the image acquired by the CT detector.
Therefore the embodiment of the utility model provides an use polyethylene or polytetrafluoroethylene to prepare flexible antenna as the substrate layer to obtain length and be 2 m's capacitive coupling formula antenna. The structure of the antenna comprises: the metal-clad laminate comprises an insert 5, a first metal copper foil layer 6, a substrate layer 7 and a second metal copper foil layer 8. The first metal copper foil layer 6 is composed of an upper copper foil wire and a lower copper foil wire, and the upper copper foil wire and the lower copper foil wire are differential wires. The interposer 5, the upper copper foil trace and the lower copper foil trace are disposed on one side of the substrate layer 7. On the other surface of the substrate layer 7, a second metal copper foil layer 8 is arranged, the second metal copper foil layer 8 also comprises an insert 5, an upper copper foil wire and a lower copper foil wire, and the upper copper foil wire and the lower copper foil wire are differential wires.
The parameters of the antenna include: the thickness of the substrate layer is as follows; 0.7mm-1.0 mm; the dielectric constant of the substrate layer is 2.3-2.8. The thickness of the upper copper foil routing is as follows: 0.1mm-0.2 mm; the width of the copper foil of the upper copper foil routing is as follows: 4mm-7 mm. The thickness of the lower copper foil routing is as follows: 0.1mm-0.2 mm; the width of the lower copper foil routing copper foil is as follows: 3cm-5 cm.
Through tests, the antenna (with the length of 2m) can achieve a high-frequency signal with the transmission rate of 2.5Gbps, namely, the measured signal attenuation is less than 3dB, so that the obtained first image and the second image have high quality.
In summary, by combining the precise control of the conveyor belt 50 and the flexible antenna with small attenuation, the second image of the detected object 4 can be accurately obtained to facilitate image stitching, and the image quality can be ensured to ensure the image stitching effect.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (10)
1. A CT detection apparatus, comprising: the device comprises a rotating disk, a conveyor belt, a CT detector, a signal transmission antenna, an encoder and a data processing computer;
the CT detector surrounds the lower part and two sides of the conveyor belt and is in communication connection with the data processing computer through the signal transmission antenna;
the encoder is arranged on the conveyor belt and is in communication connection with the conveyor belt;
the number of the signal transmission antennas is two;
two of the signal transmission antennas are disposed around the rotating disk;
and the signal output end and the signal input end of the two signal transmission antennas are in mutual contact and form a signal transmission line.
2. The apparatus of claim 1,
the CT detection device further comprises: rotating the disc;
the signal transmission antenna is a flexible antenna.
3. The apparatus of claim 1,
the CT detection device further comprises: a motion control computer;
the motion control computer is in communication with the encoder.
4. The apparatus of claim 1,
the device further comprises: a photosensor;
the photoelectric sensor includes: the conveying belt comprises a signal receiving end and a signal transmitting end, wherein the signal receiving end and the signal transmitting end are oppositely arranged on two sides of the moving direction of the conveying belt.
5. The apparatus of claim 4,
a gap exists between the detection area of the photoelectric sensor and the detection area of the CT detector.
6. The apparatus of claim 1,
the signal transmission antenna includes: the first metal copper foil layer, the substrate layer and the second metal copper foil layer;
the first metal copper foil layer is arranged on one surface of the substrate layer;
and the second metal copper foil layer is arranged on the other surface of the substrate layer.
7. The apparatus of claim 6,
the first metal copper foil layer comprises a plug-in, an upper copper foil wire and a lower copper foil wire, and the upper copper foil wire and the lower copper foil wire are differential wires.
8. The apparatus of claim 6,
the second metal copper foil layer comprises a plug-in, an upper copper foil wire and a lower copper foil wire, and the upper copper foil wire and the lower copper foil wire are differential wires.
9. The apparatus of claim 6,
the thickness of the substrate layer is as follows; 0.7mm-1.0 mm; the dielectric constant of the substrate layer is 2.3-2.8.
10. A CT inspection system, comprising: conveyor belt motor, slip ring motor and CT detection device according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023199187.2U CN214622399U (en) | 2020-12-25 | 2020-12-25 | CT detection device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023199187.2U CN214622399U (en) | 2020-12-25 | 2020-12-25 | CT detection device and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214622399U true CN214622399U (en) | 2021-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023199187.2U Active CN214622399U (en) | 2020-12-25 | 2020-12-25 | CT detection device and system |
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| CN (1) | CN214622399U (en) |
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