CN112557425B - CT detection device and tape stop control method - Google Patents
CT detection device and tape stop control method Download PDFInfo
- Publication number
- CN112557425B CN112557425B CN202011554279.XA CN202011554279A CN112557425B CN 112557425 B CN112557425 B CN 112557425B CN 202011554279 A CN202011554279 A CN 202011554279A CN 112557425 B CN112557425 B CN 112557425B
- Authority
- CN
- China
- Prior art keywords
- conveyor belt
- computer
- light barrier
- detected
- belt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
- B65G43/08—Control devices operated by article or material being fed, conveyed or discharged
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/03—Investigating materials by wave or particle radiation by transmission
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/10—Different kinds of radiation or particles
- G01N2223/101—Different kinds of radiation or particles electromagnetic radiation
- G01N2223/1016—X-ray
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/30—Accessories, mechanical or electrical features
- G01N2223/306—Accessories, mechanical or electrical features computer control
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pulmonology (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Radiology & Medical Imaging (AREA)
- Theoretical Computer Science (AREA)
- Geophysics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention relates to a CT detection device and a belt stop control method, belongs to the technical field of safety inspection equipment, and solves the problem that the belt cannot be stopped in the detection process of the conventional CT safety inspection equipment. The CT detection device comprises a ray source, a detector, a light barrier, a conveyor belt and a computer; the ray source can emit rays, and the detector can receive the rays and convert photon signals of the rays into digital signals which can be read by a computer; the light barrier can identify the area of the detected object on the conveyor belt, and the computer can control the movement of the conveyor belt according to the position of the detected object. According to the invention, through the cooperation of the optical barrier and the encoder, the computer can acquire the position of the detected article in real time, so that when the belt stopping operation is executed, the computer can judge whether the detected article is in the imaging range of the ray, further control the movement of the conveyor belt and ensure that the complete image of the detected article is acquired.
Description
Technical Field
The invention relates to the technical field of security inspection equipment, in particular to a CT detection device and a belt stop control method.
Background
The technology of direct digital radiography under the control of computer adopts a detector made of specific material to convert the X-ray signal penetrating the detected article into digital signal capable of being read by computer system, and reconstructs the acquired digital signal to obtain the tomographic image of the scanned object.
In order to obtain a complete image of a detected article, when a detector acquires data, a conveyor belt of a CT detection device needs to run at a constant speed, so that most of current security CT equipment cannot stop the conveyor belt in the detection process of the detected article in order to ensure that the conveyor belt always runs at a constant speed in the working process of the detector. When an abnormal article is detected, the information of the abnormal article cannot be checked in a pause mode, and when the next parcel enters the detection channel, the abnormal information displayed on the computer interface can be automatically covered by the detection information of the next parcel, so that inconvenience is brought to the inspection of a security inspector.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a CT detection apparatus and a tape stop control method to solve the problem that the existing CT detection apparatus cannot stop the tape during the detection process.
The purpose of the invention is mainly realized by the following technical scheme:
a CT detection device comprises a ray source, a detector, a light barrier, a conveyor belt and a computer;
the ray source can emit rays, and the detector can receive the rays and convert photon signals of the rays into digital signals which can be read by a computer;
the light barrier can identify the area of the detected object on the conveyor belt, and the computer can control the movement of the conveyor belt according to the position of the detected object.
Further, the light barriers comprise a first light barrier, a second light barrier and a third light barrier, and the light barriers are arranged above the conveyor belt.
Further, the light barrier is a photoelectric sensor and comprises an emitting end and a receiving end, and the emitting end and the receiving end are respectively positioned on two sides of the advancing direction of the conveyor belt; the transmitting end can transmit infrared signals, and the receiving end can receive the infrared signals.
Further, CT detection device still includes the encoder, the encoder is connected with the conveyer belt, the conveyer belt can drive the encoder and rotate.
Further, the computer includes a motion control computer and a data processing computer; the data processing computer can collect, store and process data; the motion control computer is capable of controlling the motion of the conveyor belt.
A belt stop control method of a CT detection device uses the CT detection device of the technical proposal;
the tape stop control method comprises the following steps:
step 1: when the CT detection device runs at a constant speed, a safety inspector executes a belt stopping operation;
step 2: detecting whether the detected object is in a ray imaging range;
and step 3: the conveyor belt continues to advance until the inspected article 40 leaves the radiographic imaging range;
and 4, step 4: the motion control computer controls the conveyor belt to stop.
Further, in the step 2, if yes, the process proceeds to the step 3.
Further, in the step 2, if not, the step 4 is entered.
Furthermore, the belt stop control method of the CT detection device also comprises
And 5: when the conveyor belt is started again, the conveyor belt firstly falls back for a certain distance and then moves forward for detection.
Further, in step 5, the backward distance is the distance of the forward movement of the conveyor belt during the increase of the speed of the conveyor belt from zero to the speed of the uniform motion.
Further, the step 2 comprises the following steps:
step 2.1: judging the area of the detected article according to the information fed back by the light barrier;
step 2.2: judging the specific position of the detected article according to the information fed back by the encoder;
step 2.3: and judging whether the detected article is in the radiographic imaging range.
Further, the belt stop control method of the CT detection device further comprises the following steps of 5: when the conveyor belt is restarted, the conveyor belt continues to move forward without rewinding.
Further, the CT detection device further comprises a rotating disk, and the radiation source and the detector are mounted on the rotating disk.
Furthermore, the CT detection device also comprises a rotating disc motor, and the rotating disc can rotate around the conveyor belt under the driving of the rotating disc motor.
The invention can realize at least one of the following beneficial effects:
(1) In the security inspection process, when the abnormal articles are detected, the conveyor belt can be suspended to further check the abnormal information, so that the operation of a security inspector is facilitated.
(2) When the belt stopping operation is executed, the motion control device can give the position of the detected article at a certain moment and control the conveyor belt to perform corresponding action, and the normal collection of the data of the detected article is not influenced.
(3) The invention judges the specific position of the detected object at a certain moment by two modes of the optical barrier and the encoder, and the judgment is accurate.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. 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 apparatus according to an embodiment of the present invention;
fig. 2 is a flowchart of a tape stop control method according to an embodiment of the present invention.
Reference numerals:
the method comprises the following steps of 1-a ray source, 2-a rotating disk, 3-a detector, 4-an encoder, 5-a first light barrier, 6-a second light barrier, 7-a third light barrier, 40-an object to be detected, 50-a conveyor belt, 60-a conveyor belt motor, 70-a motion control computer, 80-a rotating disk motor and 90-a data processing computer.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention and not to limit its scope.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the term "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection via an intermediate medium. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to obtain a complete image of a detected article, when a detector acquires data, a conveyor belt of a CT detection device needs to run at a constant speed, so that in order to ensure that the conveyor belt always runs at a constant speed in the working process of the detector, the existing CT detection device cannot stop the conveyor belt in the detection process of the detected article, and errors of the detected article image generated in the stopping and decelerating process of the conveyor belt and the restarting acceleration process are avoided.
When CT detection device detected unusual article, computer interface can show unusual information, but after next parcel got into the detection passageway, because security installations is in continuous operation, unusual information can be covered by the detection information of next parcel for the security inspector can not carefully observe unusual information, can only open the package inspection through the manual work, brings inconvenience for security inspector's inspection, influences security inspection efficiency.
Example 1
In view of the above analysis, one embodiment of the present invention, as shown in fig. 1, discloses a CT detection apparatus, which includes a radiation source 1, a rotating disk 2, a detector 3, a light barrier, a transmission device and a computer. When the belt stopping operation is executed, the computer can control the conveying device to stop running immediately or continue to move forwards according to the position of the detected article until the data of the current detected article is acquired and then the belt is stopped. Therefore, the CT detection device can stop the belt as required, and the data acquisition of the detected object is not influenced.
The radiation source 1 is used for emitting an X-ray signal, the X-ray can penetrate through the inspected object 40, and the detector 3 can receive the X-ray signal and convert a photon signal of the X-ray into a digital signal which can be read by a computer system.
The radiation source 1 and the detector 3 are arranged on a rotating disk 2. The detector 3 is provided in plurality, and a plurality of detectors 3 are arranged along the rotating disk 2 to ensure that the detector 3 can cover the range of the X-ray emitted by the ray source 1.
The rotating disk 2 can rotate at a constant speed under the driving of the rotating disk motor 80, and the radiation source 1 and the detector 3 rotate together with the rotating disk 2.
The conveying device comprises a conveyor belt 50 and a conveyor belt motor 60, the detected article 40 is placed on the conveyor belt 50, the conveyor belt 50 conveys the detected article 40 into a detection passage, and the rotating disc 2 rotates around the conveyor belt 50 at a constant speed in the process of advancing the conveyor belt 50, so that the detector 3 can acquire three-dimensional image information of the detected article 40.
The computers include a motion control computer 70 and a data processing computer 90. The detector 3 is connected to a data processing computer 90, and both the conveyor motor 60 and the turntable motor 80 are connected to a motion control computer 70.
The motion control computer 70 controls the conveyor motor 60 to move the conveyor and controls the movement of the turntable motor 80. The data processing computer 90 is used to acquire, store and process CT projection data.
In the embodiment of the present invention, a plurality of light barriers are provided, and preferably, the light barriers include a first light barrier 5, a second light barrier 6 and a third light barrier 7.
In the embodiment of the invention, the light barriers are photoelectric sensors, the light barriers are arranged above the conveyor belt 50, each set of light barriers is composed of an emitting end and a receiving end, the emitting ends and the receiving ends are distributed on two sides of the advancing direction of the conveyor belt, the emitting ends are used for emitting infrared signals, and the receiving ends are used for receiving the infrared signals.
In the embodiment of the present invention, the first light barrier 5, the second light barrier 6, and the third light barrier 7 are arranged along the moving direction of the conveyor belt, and the first light barrier 5, the second light barrier 6, and the third light barrier 7 divide the conveyor belt 50 into four areas, i.e., an area a, an area B, an area C, and an area D. The area a is set as the area from the beginning of the conveyor belt to the end of the conveyor belt, the area B is the area between the first light barrier 5 and the second light barrier 6, the area C is the area between the second light barrier 6 and the third light barrier 7, and the area D is the area from the third light barrier 7 to the end of the conveyor belt.
When no object to be inspected passes over the conveyor belt 50, the infrared signal of the emitting end of the light barrier is received by the receiving end, and the level of the receiving end is set to be high level at this time. When the object to be inspected above the conveyor belt 50 passes through the light barrier, the infrared signal of the emitting end of the corresponding light barrier is shielded by the object to be inspected, so that the receiving end cannot receive the infrared signal emitted from the emitting end, and the level of the receiving end in the shielding period is changed into low level. The level of the receiving end changes from high to low due to the fact that the object to be detected is shielded by the light path of the light barrier transmitting end and the receiving end, so that the light barrier can detect the existence of the object to be detected, and the position of the object to be detected is judged.
Further, the CT detection apparatus of the embodiment of the present invention further includes an encoder 4, and the encoder 4 is configured to determine an accurate position of the detected object. Specifically, the number of pulses n for one rotation of the encoder 4 is the accuracy of the encoder, and one pulse signal is transmitted for every 1/n rotation of the encoder. The encoder 4 is connected with the conveyor belt through a mechanical device (such as a gear), the mechanical device is in contact with the conveyor belt, the movement of the conveyor belt drives the encoder 4 to rotate, the distance that the conveyor belt 50 advances for one circle of rotation of the encoder 4 is set to be L, the encoder 4 sends a pulse signal every time, and the distance that the conveyor belt advances is L/n. The motion control computer 70 can calculate the distance of the belt advance based on the pulse signal transmitted from the encoder 4, and can determine the position of the object to be inspected.
Specifically, the object 40 moves from the area a to the area D, and since the relative position of the light barrier and the radiographic imaging range is known, it can be determined whether the object 40 is within the radiographic imaging range or not, based on the distance between the object 40 and the light barrier. For example, the starting point of the radiographic imaging range is located in the region B and is at a distance S1 from the first optical barrier, the end point of the radiographic imaging range is located in the region C and is at a distance S2 from the second optical barrier 6, the time for the detected article to pass through the first optical barrier is set to t0, after the time t1 elapses, the distance for the conveyor belt to advance is obtained as S1 according to information fed back by the encoder, and accordingly, the detected article on the conveyor belt advances at a distance S1 along with the conveyor belt, and the detected article enters the radiographic imaging range.
The CT detection apparatus of the embodiment of the present invention enables the motion control computer 70 to obtain the position of the detected object 40 in real time by using the optical barrier and the encoder 4 in a matching manner, so that when the belt stopping operation is performed, the motion control computer 70 can determine whether the detected object 40 is in the imaging range of the ray, and further control the motion of the conveyor belt 50, thereby ensuring that a complete image of the detected object 40 is acquired.
Example 2
One embodiment of the present invention, as shown in fig. 2, discloses a belt stop control method of a CT detection device, using the CT detection device of embodiment 1;
the tape stop control method comprises the following steps:
step 1: when the CT detection device operates at a constant speed, a safety inspector performs belt stopping operation:
under normal conditions, the CT detection device runs at a constant speed, when special conditions occur and the belt needs to be stopped, a safety inspector executes belt stopping operation, and the motion control computer receives a belt stopping instruction.
And 2, step: detecting whether the inspected article 40 is within the radiographic range:
in the embodiment of the present invention, the light barrier and the encoder 4 are used to detect whether the inspected object 40 is in the range of radiographic imaging, specifically, the method includes the following steps:
step 2.1: judging the area of the detected article according to the information fed back by the light barrier:
the first, second and third light barriers 5, 6, 7 divide the conveyor belt into four zones, zone a, zone B, zone C and zone D. When the object 40 passes through the optical barrier, the feedback level of the corresponding optical barrier changes from high level to low level, so that it can be determined that the object is in the area a, the area B, the area C or the area D. For example, when the object passes through the first optical barrier 5, the level fed back by the first optical barrier changes from high level to low level, so that it can be determined that the object enters the region B.
Step 2.2: and judging the specific position of the detected article according to the information fed back by the encoder:
in the embodiment of the invention, the encoder is connected with the conveyor belt, the advancing distance of the conveyor belt is L and the number of pulses sent by the encoder is n when the encoder rotates for each circle, so that the advancing distance of the conveyor belt is L/n when the encoder sends one pulse signal, and the motion control computer can judge the advancing distance of the conveyor belt according to the number of pulses of the encoder, thereby judging the accurate position of the detected object 40 on the conveyor belt.
Step 2.3: judging whether the inspected article 40 is within the radiographic range:
because the relative position of the light barrier and the radiographic imaging range is known, whether the detected object is in the radiographic imaging range can be judged according to the distance between the detected object and the light barrier. For example, the starting point of the radiographic imaging range is located in the region B and is at a distance S1 from the first light barrier 5, the end point of the radiographic imaging range is located in the region C and is at a distance S2 from the second light barrier 6, the time for the detected article to pass through the first light barrier is set to t0, after the time t1 elapses, the distance for the conveyor belt to advance is obtained as S1 according to information fed back by the encoder, and accordingly, the detected article on the conveyor belt advances at a distance S1 with the conveyor belt, and the detected article enters the radiographic imaging range.
According to the steps, whether the detected article is located in the radiographic imaging range or not when the belt stopping operation is executed is judged, if yes, the step 3 is carried out, and if not, the step 4 is carried out.
And step 3: the conveyor belt 50 continues to advance until the inspected article 40 leaves the radiographic range:
when the belt stopping operation is performed, if the detected article 40 is located in the radiographic imaging range, the conveyor belt 50 does not stop, and the operation is continued until the detected article 40 leaves the radiographic imaging range, and the image information acquisition of the detected article is finished.
Because the relative position of the light barrier and the radiographic imaging range is known, whether the detected object leaves the radiographic imaging range can be judged according to the distance between the detected object and the light barrier. For example, the starting point of the radiographic imaging range is located in the region B and is at a distance S1 from the first optical barrier, the end point of the radiographic imaging range is located in the region C and is at a distance S2 from the second optical barrier 6, the time for the detected article to pass through the second optical barrier 6 is set to t0, after the time t1 elapses, the distance for the conveyor belt to advance is obtained as S2 according to the information fed back by the encoder, and accordingly, the distance for the detected article on the conveyor belt to advance along with the conveyor belt is S2, the detected article leaves the radiographic imaging range, and the process proceeds to step 4.
And 4, step 4: the motion control computer controls the conveyor belt to stop running:
when the motion control computer judges that no detected article exists in the camera imaging range, the motion control computer controls the conveyor belt motor 60 to stop running, so that the conveyor belt stops running.
And 5: when the conveyer belt is started again, the conveyer belt firstly falls back for a certain distance, and then advances to detect:
in order to obtain an accurate image of a detected article, a detector collects information of the detected article only when a conveyor belt runs at a constant speed, and does not collect information in the process of acceleration or deceleration of the conveyor belt, so that when the conveyor belt is restarted, the conveyor belt needs to be firstly reversed for a certain distance, the reversed distance is the advancing distance in the process of increasing the speed of the conveyor belt from zero to the speed of the conveyor belt during constant-speed motion, and the acquired distance is calculated according to the acceleration of the conveyor belt, so that the conveyor belt is in a state of constant-speed running when the detected article enters into the collection range.
In the process of the conveyor belt falling back, the encoder rotates along with the movement of the conveyor belt, and whether the conveyor belt falls back in place or not can be judged according to the pulse signals sent by the encoder.
According to the belt stop control method of the CT detection device, the light barrier and the encoder are used for judging the specific position information of the detected object, so that the data acquisition of the detected object is not influenced in the belt stop process, and the complete image information of the detected object is ensured to be obtained.
Example 3
The embodiment of the invention discloses another tape stop control method of a CT detection device, which is an improvement of the embodiment 2 and comprises the following steps:
step 1: when the CT detection device operates at a constant speed, a safety inspector performs belt stopping operation:
under normal conditions, the CT detection device runs at a constant speed, when special conditions occur and the belt needs to be stopped, a safety inspector executes belt stopping operation, and the motion control computer receives a belt stopping instruction.
Step 2: detecting whether the inspected article 40 is within the radiographic range:
in the embodiment of the present invention, the light barrier and the encoder 4 are used to detect whether the inspected article 40 is in the range of radiographic imaging, and specifically, the method includes the following steps:
step 2.1: judging the area of the detected article according to the information fed back by the light barrier:
the first, second and third light barriers 5, 6, 7 divide the conveyor belt into four zones, zone a, zone B, zone C and zone D. When the object 40 passes through the optical barrier, the feedback level of the corresponding optical barrier changes from high level to low level, so that it can be determined that the object is in the area a, the area B, the area C or the area D. For example, when the detected article passes through the first optical barrier 5, the feedback level of the first optical barrier changes from high level to low level, so that it can be determined that the detected article enters the region B.
Step 2.2: judging the accurate position of the detected article according to the information fed back by the encoder:
in the embodiment of the invention, the encoder is connected with the conveyor belt, the advancing distance of the conveyor belt is L and the number of pulses sent by the encoder is n when the encoder rotates for each circle, so that the advancing distance of the conveyor belt is L/n when the encoder sends one pulse signal, and the motion control computer can judge the advancing distance of the conveyor belt according to the number of pulses of the encoder, thereby judging the accurate position of the detected object 40 on the conveyor belt.
Step 2.3: judging whether the inspected article 40 is within the radiographic range:
because the relative position of the light barrier and the radiographic imaging range is known, whether the detected object is in the radiographic imaging range can be judged according to the distance between the detected object and the light barrier. For example, the starting point of the radiographic imaging range is located in the region B and is at a distance S1 from the first light barrier 5, the end point of the radiographic imaging range is located in the region C and is at a distance S2 from the second light barrier 6, the time for the detected article to pass through the first light barrier is set to t0, after the time t1 elapses, the distance for the conveyor belt to advance is obtained as S1 according to information fed back by the encoder, and accordingly, the detected article on the conveyor belt advances at a distance S1 with the conveyor belt, and the detected article enters the radiographic imaging range.
According to the steps, whether the detected article is located in the radiographic imaging range or not when the belt stopping operation is executed is judged, if yes, the step 3 is carried out, and if not, the step 4 is carried out.
And step 3: the conveyor belt 50 continues to advance until the inspected article 40 leaves the radiographic imaging range:
when the belt stopping operation is performed, if the detected article 40 is located in the radiographic imaging range, the conveyor belt 50 does not stop, and the operation is continued until the detected article 40 leaves the radiographic imaging range, and the image information acquisition of the detected article is finished.
Because the relative position of the light barrier and the radiographic imaging range is known, whether the detected object leaves the radiographic imaging range can be judged according to the distance between the detected object and the light barrier. For example, the starting point of the radiographic imaging range is located in the region B and is at a distance S1 from the first light barrier, the end point of the radiographic imaging range is located in the region C and is at a distance S2 from the second light barrier 6, the time when the detected article passes through the second light barrier 6 is set to be t0, after the time t1 elapses, the distance that the conveyor belt advances is obtained as S2 according to information fed back by the encoder, and accordingly, the distance that the detected article on the conveyor belt advances along with the conveyor belt is S2, the detected article leaves the radiographic imaging range, and the process proceeds to step 4.
And 4, step 4: the motion control computer controls the conveyor belt to stop running:
when the motion control computer judges that no detected article exists in the camera imaging range, the motion control computer controls the conveyor belt motor 60 to stop running, so that the conveyor belt stops running.
And 5: when the conveyer belt is restarted, the conveyer belt continues to move ahead, does not need to rewind:
after the security check personnel perform the start-up operation, the speed of the conveyor belt is gradually increased from zero to a constant speed during normal operation. In the process, the advancing distance of the conveyor belt in each acquisition period of the encoder 4 is unchanged, but the time of each acquisition period of the encoder 4 is reduced along with the increase of the speed of the conveyor belt, the computer can generate a displacement curve of the conveyor belt according to the displacement information acquired by the encoder and the acquired time interval, and the acquisition frequency of the detector 3 is controlled by using the displacement curve of the conveyor belt, so that the advancing distance of the conveyor belt in the interval process of acquiring data twice by the detector 3 is unchanged, and the computer can generate a CT sectional image of the detected object accelerating the distance according to the data acquired by the detector 3.
When the conveyor belt accelerates to the uniform motion during normal operation, the encoder 4 acquires data according to a fixed frequency, and the computer can splice the image of the acceleration section and the image of the uniform velocity section to form a complete image of the detected object 40, so that rewinding is not needed when the conveyor belt is restarted.
In summary, according to the CT detection apparatus and the belt stop control method provided in the embodiments of the present invention, through the cooperative use of the optical barrier and the encoder, the computer can obtain the position of the detected object in real time, so that when the belt stop operation is executed, the computer can determine whether the detected object is in the imaging range of the ray, and further control the movement of the conveyor belt, thereby ensuring that a complete image of the detected object is acquired.
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 (3)
1. A belt stop control method of a CT detection device is characterized in that a CT detection device is used;
the CT detection device comprises a ray source (1), a detector (3), an encoder (4), a light barrier, a conveyor belt (50) and a computer;
the ray source (1) can emit rays, and the detector (3) can receive the rays and convert photon signals of the rays into digital signals which can be read by a computer;
the light barriers comprise a first light barrier (5), a second light barrier (6) and a third light barrier (7); the light barrier is arranged above the conveyor belt (50); the first light barrier (5), the second light barrier (6) and the third light barrier (7) divide the conveyor belt (50) into four areas, namely an area A, an area B, an area C and an area D; the level of the receiving end is changed from high to low due to the fact that the object to be detected (40) passes through the shielding formed by the light paths of the light barrier emitting end and the receiving end, so that the light barrier can identify the area where the object to be detected (40) is located on the conveyor belt (50), and the computer can control the movement of the conveyor belt (50) according to the position where the object to be detected (40) is located;
the encoder (4) is connected with the conveyor belt (50), and the conveyor belt (50) can drive the encoder (4) to rotate;
by the cooperation of the optical barrier and the encoder (4), the computer can acquire the position of the detected article (40) in real time, so that when the belt stopping operation is executed, the computer can judge whether the detected article (40) is in the imaging range of the ray, and further control the movement of the conveyor belt;
the computer can generate a conveyor belt displacement curve according to the displacement information of the detected article (40) acquired by the encoder (4) and the acquired time interval; the computer can control the acquisition frequency of the detector (3) by utilizing a conveyor belt displacement curve, so that the advancing distance of the conveyor belt (50) is unchanged in the interval process of acquiring data by the detector (3) every two times, and the computer can generate a CT sectional image of the detected article accelerating the distance according to the data acquired by the detector (3);
the tape stop control method comprises the following steps:
step 1: when the CT detection device runs at a constant speed, a safety inspector executes a belt stopping operation;
step 2: detecting whether the inspected object (40) is in a radiographic range; if yes, entering step 3, if not, entering step 4;
and step 3: the conveyor belt (50) continues to advance until the detected object (40) leaves the ray imaging range;
and 4, step 4: the motion control computer (70) controls the conveyor belt (50) to stop running;
and 5: when the conveyor belt (50) is started again, the conveyor belt (50) firstly falls back for a certain distance and then moves forwards; the falling distance of the conveyor belt (50) is the advancing distance in the process that the speed of the conveyor belt (50) is increased from zero to the speed during uniform motion, so that the conveyor belt (50) is in a state of uniform motion when the detected object (40) enters the acquisition range; the detector collects the information of the detected object (40) only when the conveyor belt runs at a constant speed;
or the conveyor belt (50) continues to move forward without rewinding; the speed of the conveyor belt (50) is gradually increased from zero to a constant speed in normal operation, and the computer controls the acquisition frequency of the detector (3) by utilizing a conveyor belt displacement curve.
2. The stop control method of the CT detecting device according to claim 1, wherein the light barrier is a photo sensor, and the light barrier includes a transmitting end and a receiving end, and the transmitting end and the receiving end are respectively located at two sides of the advancing direction of the conveyor belt (50); the transmitting end can transmit infrared signals, and the receiving end can receive the infrared signals.
3. The stop belt control method of the CT detecting device according to claim 1, wherein the computer comprises a motion control computer (70) and a data processing computer (90); the data processing computer (90) is capable of collecting, storing and processing data; the motion control computer (70) is capable of controlling the motion of the conveyor belt (50).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011554279.XA CN112557425B (en) | 2020-12-24 | 2020-12-24 | CT detection device and tape stop control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011554279.XA CN112557425B (en) | 2020-12-24 | 2020-12-24 | CT detection device and tape stop control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112557425A CN112557425A (en) | 2021-03-26 |
| CN112557425B true CN112557425B (en) | 2023-01-10 |
Family
ID=75033779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011554279.XA Active CN112557425B (en) | 2020-12-24 | 2020-12-24 | CT detection device and tape stop control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112557425B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113916917A (en) * | 2021-10-20 | 2022-01-11 | 北京航星机器制造有限公司 | Security inspection system based on CT technology and detection method thereof |
| CN114634009A (en) * | 2022-04-12 | 2022-06-17 | 唐山贺祥智能科技股份有限公司 | Product supporting plate identification method with self-correction function |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175699A (en) * | 2007-10-30 | 2011-09-07 | 清华大学 | Examining system, examining method, CT (computed tomography) device and detecting device |
| CN106596596A (en) * | 2016-12-13 | 2017-04-26 | 中国海洋石油总公司 | Core X-ray scanning testing experimental method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7492860B2 (en) * | 2006-04-04 | 2009-02-17 | Ge Security, Inc. | Apparatus and method for controlling start and stop operations of a computed tomography imaging system |
| US7720194B2 (en) * | 2007-02-16 | 2010-05-18 | L-3 Communications Security and Detection Systems Inc. | High throughput baggage inspection system |
| US7724866B2 (en) * | 2007-06-27 | 2010-05-25 | Analogic Corporation | Method of and system for variable pitch computed tomography scanning for baggage screening |
-
2020
- 2020-12-24 CN CN202011554279.XA patent/CN112557425B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175699A (en) * | 2007-10-30 | 2011-09-07 | 清华大学 | Examining system, examining method, CT (computed tomography) device and detecting device |
| CN106596596A (en) * | 2016-12-13 | 2017-04-26 | 中国海洋石油总公司 | Core X-ray scanning testing experimental method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112557425A (en) | 2021-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112710683B (en) | CT detection device and detection method | |
| CN112557425B (en) | CT detection device and tape stop control method | |
| US7492860B2 (en) | Apparatus and method for controlling start and stop operations of a computed tomography imaging system | |
| US4736401A (en) | X-ray scanner | |
| RU2663258C1 (en) | Vehicles monitoring system | |
| CN112710679B (en) | DR detection device and detection method | |
| US5486700A (en) | Proximity controls for gamma camera | |
| RU2661299C1 (en) | Vehicle dragging system and vehicle monitoring system | |
| WO2015051665A1 (en) | System and method for inspecting aircraft | |
| CN104122277A (en) | Computed tomography (CT) detector of cables | |
| CN101113960B (en) | Device for testing explosive with backscatter technology | |
| US20110122989A1 (en) | Detection system, dr imaging apparatus and ct imaging apparatus | |
| US4032789A (en) | Means for controlling operation of power sources associated with an axial tomographic system | |
| CN213986870U (en) | CT detection device | |
| US20090110143A1 (en) | Inspection system, inspection method, ct apparatus and detection device | |
| CN214409338U (en) | DR detection device | |
| CN102175699A (en) | Examining system, examining method, CT (computed tomography) device and detecting device | |
| CN103901064A (en) | Ray emission device, imaging system and inspection method | |
| CN214150504U (en) | CT detection device | |
| CN115389535A (en) | Scanning imaging device | |
| EP0188782B1 (en) | Sectional radiography display method and apparatus | |
| CN2927043Y (en) | Apparatus for inspecting explosive by back scattering technology | |
| CN102175697B (en) | Object inspecting system | |
| CN115307587A (en) | Position precision detection device and position precision detection method of slicing system | |
| CN212658644U (en) | Micro-dose X-ray foot detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |