CN112748134A - CT detection method and detection device of CT detection device - Google Patents
CT detection method and detection device of CT detection device Download PDFInfo
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- 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
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- 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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Abstract
The invention relates to a CT detection method and a CT detection device of a CT detection device, relates to the technical field of CT detection, and is used for solving the problem that once a safety inspector stops taking a belt, the safety inspector needs to move a detected object entering a detection area to the outside of the monitoring area and perform safety inspection again, wherein the detection method comprises the following steps: acquiring a first image and movement data of the conveyor belt, the movement data comprising: the moving speed and moving time of the conveyor belt; determining that the conveyor belt stops moving according to a stop instruction input from the outside; detecting whether the first image is the same as a pre-stored background image, wherein the background image is an image corresponding to the conveyor belt when no detection object exists; when the first image is different from the background image, generating a moving instruction according to the first image, the moving data and the rewinding time; controlling the conveyor belt to move through a moving instruction; acquiring a second image of the detected object; and splicing the first image and the second image to obtain a complete image of the detected object. The technical scheme provided by the invention can improve the security inspection efficiency.
Description
Technical Field
The present invention relates to the field of CT detection technologies, and in particular, to a CT detection method and a detection device for a CT detection device.
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.
Disclosure of Invention
In view of the above analysis, the present invention provides a CT detection method and a detection apparatus for a CT detection apparatus to improve security inspection efficiency.
The purpose of the invention is mainly realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a CT detection method for a CT detection apparatus, including:
acquiring a first image and movement data of a conveyor belt, the movement data comprising: the moving speed and moving time of the conveyor belt;
determining that the conveyor belt stops moving according to a stop instruction input from the outside;
detecting whether the first image is the same as a pre-stored background image, wherein the background image is an image corresponding to the conveyor belt when no detection object exists;
when the first image is different from the background image, generating a moving instruction according to the first image, moving data and preset rewinding time;
controlling the conveyor belt to move through the movement instruction;
acquiring a second image of the detected object;
and splicing the first image and the second image to obtain a complete image of the detected object.
Further, when the first image is the same as the background image, determining that the conveyor belt stops moving according to a stop instruction input from the outside;
generating a conveyor belt advancing instruction or a conveyor belt rewinding instruction according to the background image, wherein the moving instruction comprises the conveyor belt advancing instruction and the conveyor belt rewinding instruction;
and controlling the conveyor belt to move through the conveyor belt forward moving instruction or the conveyor belt rewinding instruction.
Further, whether prompt information sent by the photoelectric sensor is received or not is detected;
when the prompt information is received, generating a conveyor belt rewinding instruction;
generating the conveyor belt advance command when the prompt message is not received.
Further, whether prompt information sent by the photoelectric sensor is received or not is detected;
and when the prompt information is received, controlling the ray source to emit X rays.
Further, determining that the first image is different from a background image, wherein the background image is an image corresponding to the conveyor belt when no detection object exists;
and generating a conveyor belt rewinding instruction according to the movement data and the rewinding time, wherein the movement instruction comprises the conveyor belt rewinding instruction.
Further, according to the moving speed and the moving time, determining a maximum rewinding speed and a first time, wherein the first time is the time when the conveyor belt accelerates from a static state to the maximum rewinding speed;
determining a second time according to the rewinding time, the rewinding maximum speed and the first time, wherein the second time is the time when the conveyor belt decelerates from the time of the rewinding maximum speed to a static state;
determining the maximum forward speed and the third time of the conveyor belt according to the maximum rewind speed and the second time, wherein the third time is the time from the acceleration of the conveyor belt from a static state to the maximum forward speed of the conveyor belt;
generating the belt rewinding instruction using the maximum rewinding speed, the first time, the rewinding time, the second time, the maximum belt advancing speed, and the third time.
Further, the first time, the second time and the third time are equal in value;
the maximum forward speed of the conveyor belt is equal to the maximum rewind speed.
In a second aspect, an embodiment of the present invention provides a CT detection apparatus, for implementing the detection method according to any one of claims 1 to 5, including: the CT detector, the signal transmission antenna, the encoder, the motion control unit and the data processing unit;
the CT detector is used for acquiring a first image of a detected object; transmitting the first image to the data processing unit through the signal transmission antenna;
the encoder is used for collecting the movement data of the conveyor belt and transmitting the movement data to the data processing unit, and the movement data comprises: the moving speed and moving time of the conveyor belt;
the data processing unit is used for determining that the detected object stops moving according to a stop instruction input from the outside;
the motion control unit is used for generating a moving instruction according to the first image, the moving data and preset rewinding time, and sending the moving instruction to the encoder and the CT detector;
the motion control unit is used for controlling the conveyor belt to move according to the movement instruction;
the CT detector is used for acquiring a second image of the detected object according to the moving instruction and transmitting the first image to the data processing unit through the signal transmission antenna;
and the data processing unit is used for splicing the first image and the second image to obtain a complete image of the detected object.
Further, the CT detection apparatus further includes: rotating the disc;
the signal transmission antennas are flexible antennas, the number of the signal transmission antennas is two,
the two signal transmission antennas are arranged around the rotating disk and form a signal transmission line.
Further, the signal output end and the signal input end of the two signal transmission antennas are in contact with each other.
Further, the apparatus further comprises: a photosensor;
the photoelectric sensor includes: the signal receiving end and the signal transmitting end are oppositely arranged at two sides of the moving direction of the conveyor belt;
the photoelectric sensor is used for detecting whether the detected object is about to reach a detection area of the CT detector;
the detection area is the detection range of the CT detector on the conveyor belt.
Further, the data processing unit is used for determining that the first image is different from a background image, and the background image is an image corresponding to the conveyor belt when no detected object exists; the motion control unit is used for generating a conveyor belt rewinding instruction according to the movement data and the rewinding time, and the movement instruction comprises the conveyor belt rewinding instruction.
Further, the motion control unit is used for determining a maximum rewinding speed and a first time according to the moving speed and the moving time, wherein the first time is the time for accelerating the conveyor belt from a static state to the maximum rewinding speed; determining a second time according to the rewinding time, the rewinding maximum speed and the first time, wherein the second time is the time when the conveyor belt decelerates from the time of the rewinding maximum speed to a static state; determining the maximum forward speed and the third time of the conveyor belt according to the maximum rewind speed and the second time, wherein the third time is the time from the acceleration of the conveyor belt from a static state to the maximum forward speed of the conveyor belt; generating the belt rewinding instruction using the maximum rewinding speed, the first time, the rewinding time, the second time, the maximum belt advancing speed, and the third time.
The technical scheme of the invention can realize one of the following beneficial effects:
1. the problem of image interruption of the detected object after the tape is stopped is solved through an image splicing technology, and meanwhile, the movement of the conveyor belt is controlled according to the tape rewinding time preset by the splicing method, so that the image splicing effect is guaranteed. The CT detection device is used for replacing manpower to move the detected object out of the detection area, so that the safety inspection efficiency is improved.
And 2, the CT detection device determines whether the detected object exists in the monitoring area or not by comparing the first image with the background image. 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. Carry out accurate control to the rewinding process of conveyer belt through CT detection device rewinding maximum speed, the very first time, rewinding time, the second time, conveyer belt maximum speed of marcing forward and third time to avoid appearing rewinding the not enough and too big problem of rewinding distance, further improved security check efficiency.
4. 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.
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 representation of conveyor belt speed over time after a stop in accordance with an embodiment of the present invention;
fig. 3 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-first metal copper foil; 7-a substrate; 8-a second metal copper foil; 40-detected object; 50-a conveyor belt; 60-conveyor belt motor; 70-a motion control unit; 80-slip ring motor; 90-data processing unit.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
An embodiment of the present invention provides a CT detection system as shown in fig. 1, including: a radiation source 1, a rotating disk 2 and a CT detector 3, an encoder 4, a conveyor belt 50, a data processing unit 90, a conveyor belt motor 60, a slip ring motor 80 and a motion control unit 70. The CT detector 3, the encoder 4, the data processing unit 90 and the signal transmission antenna form the detection apparatus according to the embodiment of the present invention. The signal transmission antenna is not shown in fig. 1.
The working process of the CT detection system is as follows: the object to be detected 40 is transported to the detection range of the radiation source 1 by the conveyor belt 50, and the radiation emitted from the radiation source 1 passes through the object to be detected 40 and is absorbed by the CT detector 3. The CT detector 3 converts the received signal into an analog signal, transmits the analog signal to the data processing unit 90 through the signal transmission antenna wound on the rotating disk 2, and finally converts the analog signal into an image of the detected object 40 by the data processing unit 90.
It should be noted that the radiation source 1 emits radiation under the following conditions: the detected object 40 moves at a uniform speed in the direction close to the radiation source 1. That is, no image of the object 40 is obtained once the object 40 stops moving or the belt 50 is rewound or the object 40 is moved at a variable speed. The image of the detected object 40 is necessarily interrupted once the tape is stopped.
In order to solve the problem that the image of the detected object 40 is interrupted during the tape stop, the application proposes to adopt an image splicing method, namely, the images of the detected object 40 before and after the tape stop are combined together to obtain the finished image of the detected object, so as to avoid the image interruption under the condition of uniform motion in the direction which is not close to the ray source, such as deceleration, tape stop or acceleration, caused by the tape stop.
The detection method of the CT detection system provided by the embodiment of the invention comprises the following specific steps:
In an embodiment of the present invention, the moving data includes: the moving speed and moving time of the conveyor belt.
And 2, externally inputting a stop instruction, and stopping the conveyor belt by the CT detection device according to the externally input stop instruction.
And 3, detecting whether the first image is the same as a pre-stored background image by the CT detection device.
In an embodiment of the invention, the background image is an image corresponding to the conveyor belt without the detection object.
And 4, when the first image is different from the background image, the CT detection device generates a movement instruction according to the first image, the movement data and the preset rewinding time.
And 5, controlling the CT detection device to move the conveyor belt according to the movement instruction.
And 6, acquiring a second image of the detected object by the CT detection device.
And 7, splicing the first image and the second image by the CT detection device to obtain a complete image of the detected object.
In the embodiment of the present invention, when the moving direction of the detected object 40 is close to the radiation source 1 and the detected object 40 moves at a constant speed, the CT detecting apparatus will acquire the image of the detected object 40. Before stopping the belt, when the detected object moves at a constant speed in the direction close to the ray source 1, the CT detection device can acquire a first image of the detected object and the moving data of the conveyor belt.
As shown in fig. 2, the detected object 40 and the conveyor belt 50 after the belt stop are subjected to inertia at Δ t1Internally with a decelerating movement, Δ t1Is close to the radiation source 1 and moves at a constant speed, so that the CT detection device can only move at delta t in the process1If the image is acquired at the starting time, the image acquired at the time is the first image.
Specifically, the CT detector 3 acquires a first image of the detected object; the first image is transmitted to the data processing unit 90 through the signal transmission antenna. The encoder 4 is used for collecting the movement data of the conveyor belt and transmitting the movement data to the data processing unit 90, and the movement data includes: the moving speed and moving time of the conveyor belt. The data processing unit 90 determines that the detected object 4 stops moving according to a stop instruction input from the outside; generating a moving instruction according to the first image, the moving data and the preset rewinding time, and sending the moving instruction to the encoder and the CT detector;
the motion control unit 70 is used for controlling the conveyor belt to move according to the movement instruction;
the CT detector 3 acquires a second image of the detected object 4 according to the moving instruction, and transmits the first image to the data processing unit 90 through the signal transmission antenna;
the data processing unit 90 splices the first image and the second image to obtain a complete image of the detected object.
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.
Regarding the problem a, in the embodiment of the present invention, the specific process implemented by the cooperation of the encoder 4, the motion control unit 70 and the digital processing unit 90 is as shown in fig. 2.
After the tape is stopped, the encoder 4 will acquire Δ t in real time1During which the speed of movement and the time of movement of the conveyor belt. At the same time, the CT detector 3 will be at Δ t1The first image is obtained when the detected object 40 moves at a constant speed v0 along the direction close to the ray source.
In order to prevent rewinding in the absence of the detected object 40, the number processing unit 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 unit 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.
Note that, when the first image is the same as the background image, image defects are caused in the following two cases.
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.
In the first case, in order to prevent the entry of the article into the detection area to cause image deformity when the conveyor belt is accelerated, in the embodiment of the present invention, a photosensor is provided on the conveyor belt. When the photoelectric sensor 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 photoelectric sensor emits a trigger signal to the radiation source 1 to make the radiation source 10 emit a ray before the detected object reaches the detection region. The photoelectric sensor can also send a prompt signal to the data processing unit 90, and the data processing unit 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 sequentially passes through the detection area of the photoelectric sensor and the detection area of the ray source when being transmitted in the forward direction. The photoelectric sensor comprises a signal receiving end and a signal transmitting end, wherein 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 of the signal transmitting end is used for transmitting detection signals, the other side of the signal receiving end is used for receiving the detection signals, and when the signal receiving end cannot receive or can only receive part of the transmission signals, the signal transmitting end sends prompt information to prompt a detected object to enter a photoelectric sensor detection area in a belt stop state. The principle is that when an object to be detected passes through a detection area of a photoelectric sensor on a conveyor belt, a signal transmitting end can not transmit or partially transmit a signal through the object to be detected, and a signal receiving end can not receive or can only receive a part of the transmitted signal, so that a difference value exists between signal transmitting and signal receiving. In one possible embodiment, the signal transmitting end and the signal receiving end are a laser transmitting end and a laser receiving end.
In order to avoid the problem that the radiation source 1 stops emitting radiation to cause the loss of images of partial articles in the belt-stop state and the missing detection of the articles due to the accelerated motion or the decelerated motion of the detected articles in the belt-stop state, the distance between the photoelectric sensor and the detection area needs to be set to ensure that the radiation is emitted before the detected object reaches the detection area. Specifically, when the distance between the photoelectric sensor and the detection area is S, the object 40 to be detected is in the process of transmissionThe forward uniform motion v on the belt 50Wherein the forward uniform motion is v0Normally, the maximum speed is obtained, and the photoelectric sensor will detect the current speed of the detected object 40 at t ═ S/v no matter what the current speed is, the photoelectric sensor will detect at the encoder 40At this time, the radiation source 10 is triggered to emit radiation to ensure that the detected object emits radiation before reaching the detection region.
In the second case, in order to prevent the detected object from entering the detection area to cause image defect after the conveyor belt stops, in the embodiment of the present invention, a photoelectric sensor is provided on the conveyor belt. When the photoelectric sensor detects that the detected object passes through, the detected object possibly reaches the detection area of the CT detector. At this time, since the tape has been stopped, the photoelectric sensor sends a prompt signal to the data processing unit 90, so that the motion control unit 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 photoelectric sensor. Finally, the conveyor 5 executes a conveyor rewind command.
If the first image is different from the background image, indicating that there is the detected object 40 on the conveyor belt 5, the motion control unit 70 needs to determine various rewinding parameters, including: Δ t2-Δt6、v0And-v0。
Wherein v is0Characterizing the uniform forward movement of the conveyor belt 5, -v0The characteristic is that the conveyor belt 5 is rewound at a constant speed.
Δt1The moving time of the deceleration process after the belt is stopped;
Δt2the moving time of the rewinding acceleration process;
Δt3the moving time of the rewinding uniform speed process is shown;
Δt4the moving time of the rewinding deceleration process;
Δt5a movement time for the advancement acceleration process;
Δt6the moving time of the uniform speed process is advanced.
Note that Δ t1-Δt6May be different from each other, Δ t1-Δt6Corresponding v0And-v0The values of (c) may also be different. However, in order to improve the data processing efficiency and accurately control the position of the detected object 40 on the conveyor belt, in the embodiment of the present invention, Δ t is set1、Δt2、Δt4And Δ t5Are the same, Δ t3And Δ t6Are the same, and v0And-v0The sizes are the same and the directions are opposite.
The specific process of determining each parameter is as follows:
first according to the moving speed v0And a moving time Δ t1Determining the maximum rewinding speed-v0And a first time Δ t2，-v0And Δ t2Under the condition, the detected object 40 returns to the position where it was when the belt was stopped.
Second determining Δ t3。Δt3The image mosaic method can be obtained according to the image frequency shot by the CT detector 3, for example, the CT detector 3 shoots 12 frames of images per second, and in order to meet image mosaic, 6 frames of images are selected from the 12 frames of images to be used as the basis of mosaic. Before and after belt stop, v0In the same case, Δ t3At least 12 frames of images are taken for the CT detector 3 to ensure that the images can be stitched accurately. Therefore, the rewinding time Δ t3May be preset. The detected object 40 is measured as-v0Uniform speed rewinding delta t3Enough displacement can be reserved for the detected object in advance to ensure that the CT detector 3 can acquire enough second images in the subsequent detection process, so that support is provided for image splicing.
Again, according to Δ t3Determining the second time Deltat4From the start time of the first embodiment, the detected object 40 and the conveyor belt 50 perform deceleration movement by inertia until the rewinding speed becomes 0. Then let the second time Δ t4Is equal to the first time at2To determine the second time at4The end time of (c).
Then let the third time Δ t5Is equal to the second time deltat4The maximum speed of the belt advancing and v0Same to ensure at the third timeΔt5The detected object 40 moves to a position where a second image is to be acquired.
Finally, the detected object 40 is controlled to have a velocity v0Performing uniform motion at least delta t6The motion state is inherently maintained.
By the mode, the rewinding distance of the detected object 40 can be accurately controlled, the problem that the image splicing effect is poor due to insufficient rewinding distance is avoided, and the problem that the safety inspection efficiency is reduced due to overlong rewinding distance is solved.
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 generally 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 a PCB board can be made to be long enough, the capacitively coupled antenna 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 digital processing unit 90 cannot receive the image acquired by the CT detector.
Therefore, in the embodiment of the invention, the flexible antenna is prepared by taking polyethylene or polytetrafluoroethylene as a base material, so as to obtain the capacitive coupling antenna with the length of 2 m. The structure of the antenna comprises: an insert 5, a first metallic copper foil 6, a substrate 7 and a second metallic copper foil 8. The first metal copper foil 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, upper copper foil traces and lower copper foil traces are disposed on one side of the substrate 7. On the other side of the substrate 7, a second metal copper foil 8 is disposed, the second metal copper foil 8 also includes a plug-in 5, an upper copper foil trace and a lower copper foil trace, and the upper copper foil trace and the lower copper foil trace are differential lines.
The parameters of the antenna include: the thickness of the substrate is; 0.7mm-1.0 mm; the dielectric constant of the substrate 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.
In the embodiment of the invention, the data processing unit is used for determining that the first image is different from a background image, and the background image is an image corresponding to the conveyor belt; and generating a conveyor belt rewinding instruction according to the movement data, wherein the movement instruction comprises the conveyor belt rewinding instruction.
In the embodiment of the invention, the data processing unit is used for determining the maximum rewinding speed and the first time according to the moving speed and the moving time, wherein the first time is the time for accelerating the conveyor belt from the static state to the maximum rewinding speed; determining a second time according to the rewinding time, the rewinding maximum speed and the first time, wherein the second time is the time for decelerating the conveyor belt from the rewinding maximum speed to a static state; determining the maximum forward speed and the third time of the conveyor belt according to the maximum rewind speed and the second time, wherein the third time is the time for accelerating the conveyor belt from a static state to the maximum forward speed of the conveyor belt; and generating a belt rewinding instruction by using the maximum rewinding speed, the first time, the rewinding time, the second time, the maximum belt advancing speed and the third time.
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 are included in the scope of the present invention.
Claims (10)
1. A CT detection method of a CT detection device is characterized by comprising the following steps:
acquiring a first image and movement data of a conveyor belt, the movement data comprising: the moving speed and moving time of the conveyor belt;
determining that the conveyor belt stops moving according to a stop instruction input from the outside;
detecting whether the first image is the same as a pre-stored background image, wherein the background image is an image corresponding to the conveyor belt when no detection object exists;
when the first image is different from the background image, generating a moving instruction according to the first image, moving data and preset rewinding time;
controlling the conveyor belt to move through the movement instruction;
acquiring a second image of the detected object;
and splicing the first image and the second image to obtain a complete image of the detected object.
2. The method of claim 1, further comprising: when the first image is the same as the background image, determining that the conveyor belt stops moving according to a stop instruction input from the outside;
generating a conveyor belt advancing instruction or a conveyor belt rewinding instruction according to the background image, wherein the moving instruction comprises the conveyor belt advancing instruction and the conveyor belt rewinding instruction;
and controlling the conveyor belt to move through the conveyor belt forward moving instruction or the conveyor belt rewinding instruction.
3. The method of claim 1,
generating a movement instruction according to the first image, the movement data and a preset rewinding time, wherein the movement instruction comprises:
determining that the first image is different from a background image, wherein the background image is an image corresponding to the conveyor belt when no detection object exists;
and generating a conveyor belt rewinding instruction according to the movement data and the rewinding time, wherein the movement instruction comprises the conveyor belt rewinding instruction.
4. The method of claim 3,
generating a conveyor belt rewinding instruction according to the movement data and the rewinding time, wherein the generating comprises the following steps:
determining a maximum rewinding speed and a first time according to the moving speed and the moving time, wherein the first time is the time for accelerating the conveyor belt from a static state to the maximum rewinding speed;
determining a second time according to the rewinding time, the rewinding maximum speed and the first time, wherein the second time is the time when the conveyor belt decelerates from the time of the rewinding maximum speed to a static state;
determining the maximum forward speed and the third time of the conveyor belt according to the maximum rewind speed and the second time, wherein the third time is the time from the acceleration of the conveyor belt from a static state to the maximum forward speed of the conveyor belt;
generating the belt rewinding instruction using the maximum rewinding speed, the first time, the rewinding time, the second time, the maximum belt advancing speed, and the third time.
5. The method of claim 4,
the first time, the second time and the third time are equal in value;
the maximum forward speed of the conveyor belt is equal to the maximum rewind speed.
6. A CT detection device for implementing the detection method of claims 1-5, comprising: the CT detector, the signal transmission antenna, the encoder, the motion control unit and the data processing unit;
the CT detector is used for acquiring a first image of a detected object; transmitting the first image to the data processing unit through the signal transmission antenna;
the encoder is used for collecting the movement data of the conveyor belt and transmitting the movement data to the motion control unit, and the movement data comprises: the moving speed and moving time of the conveyor belt;
the data processing unit is used for determining that the detected object stops moving according to a stop instruction input from the outside;
the motion control unit is used for generating a moving instruction according to the first image, the moving data and preset rewinding time, and sending the moving instruction to the encoder and the CT detector;
the motion control unit is used for controlling the conveyor belt to move according to the movement instruction;
the CT detector is used for acquiring a second image of the detected object according to the moving instruction and transmitting the first image to the data processing unit through the signal transmission antenna;
and the data processing unit is used for splicing the first image and the second image to obtain a complete image of the detected object.
7. The apparatus of claim 6,
the CT detection device further comprises: rotating the disc;
the signal transmission antennas are flexible antennas, the number of the signal transmission antennas is two,
the two signal transmission antennas are arranged around the rotating disk and form a signal transmission line.
8. The apparatus of claim 7,
the signal output end and the signal input end of the two signal transmission antennas are in contact with each other.
9. The apparatus of claim 6,
the device further comprises: a photosensor;
the photoelectric sensor includes: the signal receiving end and the signal transmitting end are oppositely arranged at two sides of the moving direction of the conveyor belt;
the photoelectric sensor is used for detecting whether the detected object is about to reach a detection area of the CT detector;
the detection area is the detection range of the CT detector on the conveyor belt.
10. The apparatus of claim 6,
the data processing unit is used for determining that the first image is different from a background image, and the background image is an image corresponding to the conveyor belt when no detected object exists; the motion control unit is used for generating a conveyor belt rewinding instruction according to the movement data and the rewinding time, and the movement instruction comprises the conveyor belt rewinding instruction.
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