CN105022095B - Quick-pass type mobile target radiation inspection method and system - Google Patents
Quick-pass type mobile target radiation inspection method and system Download PDFInfo
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Abstract
The invention discloses a quick-pass type mobile target radiation inspection method, which comprises the following steps: acquiring the length K of a part needing radiation avoidance in the moving target; acquiring the moving speed V of a moving target in a detection channel; determining the time T when the part needing radiation avoidance in the moving target completely passes through the radiation inspection position based on the length K and the moving speed V; when the time T comes, rays are emitted at the radiation inspection position for radiation inspection; after the moving object leaves the radiation inspection position, the emission of radiation is stopped. The invention also provides a quick-pass type mobile target radiation inspection system. The invention can dynamically adjust the beam-emitting time of the radiation source.
Description
Technical Field
The invention relates to the technical field of radiation scanning, in particular to a quick-pass type mobile target radiation inspection method and system.
Background
At present, a high-energy radiation device is used for scanning and checking targets moving at high speed such as vehicles and the like, scanning can be completed under the condition that the vehicles do not pass through the high-energy radiation device, the high-energy radiation device is an ideal means for carrying out goods vehicle checking, and the high-energy radiation device has important significance in the aspects of finding vehicle smuggling and carrying illegal and contraband security check. In the radiation scanning inspection process, in order to ensure the personal safety of personnel, a target moving object needs to be partially avoided, for example, when a running vehicle is subjected to radiation scanning, a cab where a driver is located needs to wait for beam outgoing after passing through a radiation source, and only a carriage part loaded with goods is subjected to scanning.
At present, the radiation scanning inspection of a moving target can adopt the following modes: firstly, a sensor assembly is arranged to sense a gap between a first part and a second part of a moving target, a ray source is matched with a mechanical baffle, and the propagation of high-energy rays is controlled by opening and closing the mechanical baffle, so that the avoidance of a first part of personnel of the moving target is realized; and secondly, arranging a detection component at the downstream of the radiation source to detect that the cab passes through the scanning position and the carriage does not reach the scanning position, and then outputting beams to realize avoidance of cab personnel.
However, through a great deal of research and analysis, the schemes can achieve the purpose of inspection, but have a plurality of defects. For the first method, it is necessary to sense the gap between the first portion and the second portion of the moving target, but in many cases, there is no gap or unclear gap between the first portion and the second portion of the moving target, and this method cannot determine that the second portion reaches the inspection position, so that the second portion cannot be scanned normally. For the second mode, the position of the detection component and the radiation source is fixed, but in practical application, the length of a radiation avoiding part (such as a cab) is required to be changed, so that the missing detection of a carriage part or the error scanning of cab personnel is easily caused, the reliability of a security inspection result is low, and the radiation safety hazard is large.
Disclosure of Invention
In view of the above, the invention provides a fast-pass type moving target radiation inspection method and system, which dynamically adjust the beam-emitting time of a radiation source by reasonably arranging detectors, and realize hundred percent avoidance to people on the premise of ensuring reliable radiation inspection results.
In one aspect, the present invention provides a quick-pass type moving target radiation inspection method, including: acquiring the length K of a part needing radiation avoidance in the moving target; acquiring the moving speed V of a moving target in a detection channel; determining the time T when the part needing radiation avoidance in the moving target completely passes through the radiation inspection position based on the length K and the moving speed V; when the time T comes, rays are emitted at the radiation inspection position for radiation inspection; the emission of radiation is stopped after the moving object leaves the radiation inspection position.
Preferably, wherein the moving speed V of the moving target is (L1-L2)/(t2-t1), wherein L1 and L2 are distances from a first position and a second position, respectively, within the detection channel to the radiation inspection position, both the first position and the second position being located on an upstream side of the radiation inspection position, and L1> L2; t1 and t2 are the times when the moving object reaches the first position and the second position, respectively; taking the time when the moving target head reaches the second position as the reference time, the time T is later than the reference time, and the first time interval T1 is (K + L2)/V.
Preferably, after the moving target leaves the radiation inspection position and a second time interval from the tail of the moving target to the second position, the emission of the radiation is stopped, wherein the second time interval T2 is b L2/V, and b is a constant greater than or equal to 1.
Preferably, if the moving object decelerates after reaching the second position, the method further comprises: when the moving target head does not reach the third position after reaching the second position and passing a third time interval, not emitting rays when the time T comes; the third position is located on the downstream side of the radiation inspection position, the distance from the third position to the radiation inspection position is L3, and L3 is less than or equal to length K ', wherein K' is the minimum value of the length of a part needing radiation avoidance in various types of moving targets; the third time interval is T3 ═ a (L2+ L3)/V, and a is a constant equal to or greater than 1.
Preferably, if the moving object decelerates after reaching the second position, when the head of the moving object does not reach the third position after reaching the second position and after a third time interval, no ray is emitted when time T arrives, the method further comprises: the radiation is emitted when the moving target head reaches the third position.
Preferably, the emission of radiation is stopped when the moving target tail leaves the third position.
Preferably, the time T is later than the reference time by a fourth time interval, and the fourth time interval T4 is (K + L4)/V; with the fourth location being upstream of the radiation inspection location, a distance L4 from the radiation inspection location.
In another aspect, the present invention further provides a quick-pass type moving target radiation inspection system, including: the radiation imaging device is used for emitting rays to scan the moving target and generate a radiation image; the moving target information acquisition device is used for acquiring the length K of a part needing radiation avoidance in the moving target; the moving speed acquisition device is used for acquiring the moving speed V of the moving target in the detection channel; the radiation moment determining device is used for determining the moment T of the radiation imaging device for emitting rays based on the length K and the moving speed V; and the radiation control device is used for controlling the radiation imaging device to emit rays at the radiation inspection position for radiation inspection when the time T arrives, and stopping emitting rays after the moving target leaves the radiation inspection position.
The invention has the beneficial effects that: the invention realizes the avoidance of all people on the premise of ensuring the reliable radiation inspection result by reasonably arranging the number and the positions of the detectors, detecting the speed of the moving target and the length of the part needing radiation avoidance and dynamically adjusting the beam-emitting time of the radiation source, thereby ensuring the safety of the people.
Drawings
Fig. 1 is a flow chart of a fast-pass moving target radiation inspection method according to an embodiment of the invention.
FIG. 2 is a state diagram of a fast-pass moving object radiation inspection system according to an embodiment of the present invention.
Fig. 3 is a top view of the embodiment of fig. 2.
FIG. 4 is a state diagram of a fast-pass moving object radiation inspection system according to another embodiment of the present invention.
FIG. 5 is a state diagram of a fast-pass moving object radiation inspection system according to yet another embodiment of the present invention.
Fig. 6 is a side view of the embodiment of fig. 5.
Fig. 7 is a flow chart of a method for radiation inspection of a fast-pass moving object according to another embodiment of the invention.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 shows a flow chart of a fast-pass type radiation inspection method for a moving target according to an embodiment of the present invention, which can be used in radiation scanning detection of various moving targets, fig. 2 shows a working state diagram of a radiation inspection system according to an embodiment of the present invention, and fig. 3 is a top view of the embodiment of fig. 2, which takes security inspection of a moving target, i.e., a truck 10, as an example.
Referring to fig. 1 to 3, in this embodiment, an equipment cabin 1 and a radiation detector 2 are respectively disposed on two sides of a detection channel, a radiation source 1A, a radiation source shield 1B and a radiation beam collimation 1C are disposed in the equipment cabin 1, rays emitted by the radiation source are collimated by the radiation beam collimation 1C and then emitted, a truck 10 travels along the detection channel, scanning inspection is performed when the rays pass through a beam emitting position, the rays pass through the truck 10 and are received by the radiation detector 2, and processing such as scanning image imaging is performed. To ensure personnel safety, the cab 12 in which the driver is located is the part that needs radiation avoidance during the radiation inspection process. In order to reduce the radiation leakage of the system, a radiation shielding facility 5 can be arranged in a certain space range around the system equipment and the security inspection channel.
The radiation inspection system of the present invention includes a control module (not shown) that receives signals from the plurality of detectors and controls timing of the radiation source's beam-out. The detector can be a photoelectric switch, a light curtain, a ground induction coil, an axle load sensor and the like, and can also be a combination of the sensors; the detector may be arranged above or below the tunnel floor. In particular to this example, the detectors 20 and 30 are light curtains, both located on the upstream side (left side in the figure) of the scanning position. The detector 20 is at a distance L1 from the scan position and the detector 30 is at a distance L2 from the scan position.
In addition, a ground coil may be installed on the left side (upstream side) of the detector 30, and since the ground coil can be triggered only by a metal object, it may serve as an auxiliary detector of the detector 30, and the detector 30 may be activated only in a ground coil activated state. Through the measure, the radiation time determination error caused by the fact that other non-metal objects (such as people, birds, foreign matters and the like) except the vehicle enter the inspection channel by mistake can be effectively prevented.
During security inspection, the truck 10 runs in the detection channel, the detectors 20 and 30 are triggered at the head of the truck in sequence, the control module obtains a time difference delta T (T2-T1) according to two triggering moments, wherein T1 and T2 are moments when the detectors 20 and 30 are triggered by the truck 10 respectively, and then the running speed V (L1-L2)/delta T of the truck 10 is calculated. Assuming that the length of the cab 12 of the truck 10 is K, after the detector 30 is triggered (i.e., at the reference time), the radiation source is controlled to start emitting the radiation for scanning after the delay T1 is (K + L2)/V, because the cab 12 has completely passed through the scanning position after T1 is (K + L2)/V, the emitted radiation scans only the rear compartment portion of the truck 10, and thus the percentage avoidance of the cab (driver) is realized.
In the embodiment of the invention, the vehicle identity recognition equipment can be utilized to acquire the relevant information of the part needing to be avoided in the moving target. In the embodiment of fig. 2 and 3, a license plate recognition device is installed on the upstream side of the detector 20, and comprises a camera 5A, a light curtain sensor 5B, a ground induction coil 5C and corresponding control recognition software. After the license plate recognition device obtains the license plate information of the vehicle, the information such as the vehicle type and the size of the cab of the vehicle can be obtained from the vehicle information database storage. If the type of the vehicle is a vehicle type (such as a passenger car) for which the radiation inspection is forbidden, the control module does not allow the ray to be emitted, namely, the whole vehicle is considered to be a cab; if the vehicle type is a vehicle type (such as a truck) allowing the radiation inspection, the length parameter of the cab is sent to a control module of the radiation inspection system. Since the license plate recognition device needs a certain time to complete the license plate recognition time, the database retrieval and the communication with the radiation inspection system, it is preferable to install the license plate recognition device at a position 10-20 m away from the detector 20.
In the embodiment of the invention, the types of various moving targets and the length parameters of parts needing to be avoided can be acquired by using non-contact identification devices such as an RFID (radio frequency identification device), a bar code identification device, a two-dimensional code identification device and the like.
In an embodiment of the invention, the radiation inspection system can also be provided with a vehicle parameter information input module, and the length parameter of the cab of the vehicle to be inspected is input into the system control module by an operator. In addition, the length parameter of the cab can be preset in the radiation inspection system, and the method is suitable for the conditions that the identity of the vehicle cannot be identified, the corresponding vehicle information is lacked in a database, the vehicle type similarity is inspected, and the like.
Fig. 4 is a state diagram of the radiation inspection system according to another embodiment of the present invention, in which a detector 40 is disposed at the downstream side of the scanning position, and is used for controlling the beam-emitting timing of the radiation source when the truck 10 decelerates. The detector 40 is installed at a position spaced apart from the scanning position L3, and the L3 length should be no greater than the length of the smallest cabin among the various vehicles that may be present. In security inspection, after the detector 30 is triggered, if the detector 40 is not triggered within a time a (L2+ L3)/V, which is a factor a not less than 1, for example, a is 1.2, which indicates that the vehicle is allowed to decelerate but the minimum speed is V (1/1.2), the vehicle will not trigger the detector 40 within a time a (L2+ L3)/V, and if the speed is lower than the value, the control module will prohibit the radiation beam from being emitted by the radiation source to ensure the safety of personnel because the vehicle is traveling too slowly. Alternatively, it may be provided that after the detector 30 is triggered, the radiation source is caused to start emitting a radiation beam while waiting for the detector 40 to be triggered as well.
Fig. 5 is a state diagram of a radiation inspection system according to another embodiment of the present invention, and fig. 6 is a side view of the embodiment of fig. 5, in which a radar speed measuring device 50 is used to detect a moving speed V of a moving object, and a detector 60 is installed to determine a time when a radiation source starts emitting radiation. Specifically, the radar speed measuring device 50 may be installed at a downstream side of the scanning position at a height not lower than a maximum allowable height of the object to be inspected, and at a suitable distance from the detector 60. The detector 60 is installed on the upstream side of the scanning position at a distance L4 from the scanning position.
When the truck 10 runs on the detection channel, the speed measurement radar device 50 measures the speed of the truck 10, and can directly obtain the moving speed value V of the truck 10, and if the length of the cab 12 of the truck 10 is K, after the detector 60 is triggered by the vehicle head, the radiation source is controlled to start to emit rays for scanning after the time delay T4 is (K + L4)/V, because the cab 12 completely passes through the scanning position after T4 is (K + L4)/V, and the emitted rays only scan the rear compartment part of the truck 10 at this time.
In the embodiments of fig. 5 and 6, the radar speed measuring device 50 detects the moving speed of the target by detecting the frequency change of the electromagnetic wave reflected by the object by using the doppler effect of the electromagnetic wave, and is widely used for detecting the vehicle speed in traffic engineering, such as "spark" radar speed measuring instrument. In addition, instruments such as a laser velocimeter or a visual velocimeter can be selected to obtain the moving speed of the moving target.
Fig. 7 is a logic block diagram of a radiation inspection method according to an embodiment of the present invention, which is specifically as follows: the identity information of the vehicle to be detected is captured by using a vehicle identity recognition device, a vehicle information database is retrieved according to the vehicle identity information, and the cab length of the vehicle to be detected is determined (if corresponding data is not retrieved, parameters preset by the system can be manually input or used).
After the vehicle triggers the detector 20, the control module determines the scanning starting time according to the detected moving speed of the vehicle and the triggering time of the detector 30, and gives a scanning starting command when the scanning time arrives, and the radiation source emits rays for scanning.
When the vehicle tail leaves the detector 30 (i.e. the detector 30 returns from triggered to non-triggered state), the vehicle leaves the scanning position in its entirety after a delay of b x L2/V, the control module gives a scanning end command, and the coefficient b is greater than or equal to 1. Alternatively, the scan end command may be given when the vehicle has exited the detector 40.
The above-described embodiments of the present invention are based on the use of a transmission scanning radiation imaging system that includes a radiation source, radiation beam collimation and shielding, radiation safety facilities, radiation detectors, an image acquisition and processing system, and the like. It should be noted that, because the present invention mainly realizes the avoidance of people by calculating the beam-emitting time of radiation, and has no special requirements for radiation sources and radiation imaging equipment, the present invention can be used not only in transmission scanning radiation imaging systems, but also in other forms of radiation imaging systems, such as back-scattered radiation imaging systems, forward-scattered radiation imaging systems, and the like.
The invention realizes the intelligent avoidance of the part needing protection in the inspected object, has high avoidance precision and good safety, and is the best mode for automatically and rapidly scanning and inspecting different types of moving targets containing the part needing protection.
The technical solutions of the present invention have been described in detail with reference to specific embodiments, which are used to help understand the ideas of the present invention. The derivation and modification made by the person skilled in the art on the basis of the specific embodiment of the present invention also belong to the protection scope of the present invention.
Claims (19)
1. A fast-through type moving target radiation inspection method is characterized by comprising the following steps:
acquiring the length K of a part needing radiation avoidance in the moving target;
acquiring the moving speed V of a moving target in a detection channel;
determining the time T when the part needing radiation avoidance in the moving target completely passes through the radiation inspection position based on the length K and the moving speed V;
when the time T comes, rays are emitted at the radiation inspection position for radiation inspection;
after the moving object leaves the radiation inspection position, the emission of radiation is stopped,
wherein a moving speed V of the moving target is (L1-L2)/(t2-t1), wherein L1 and L2 are distances from a first position and a second position within the detection channel, respectively, to the radiation inspection position, the first position and the second position are both located on an upstream side of the radiation inspection position, and L1> L2; t1 and t2 are times when the moving object reaches the first position and the second position, respectively.
2. The fast-pass moving-target radiation inspection method according to claim 1, wherein a time T later than the reference time by a first time interval T1 ═ K + L2)/V is taken as the reference time.
3. The method of claim 2, wherein the emission of radiation is stopped after the moving object leaves the radiation inspection position and after a second time interval from the tail of the moving object to a second position, wherein the second time interval T2 is b L2/V, and b is a constant equal to or greater than 1.
4. The method of claim 2, wherein if the moving object decelerates after reaching the second position, the method further comprises:
when the moving target head does not reach the third position after reaching the second position and passing a third time interval, not emitting rays when the time T comes; wherein the content of the first and second substances,
the third position is positioned at the downstream side of the radiation inspection position, the distance from the third position to the radiation inspection position is L3, and L3 is less than or equal to length K ', wherein K' is the minimum value of the length of the part needing radiation avoidance in various types of moving targets;
the third time interval is T3 ═ a (L2+ L3)/V, and a is a constant equal to or greater than 1.
5. The method of claim 4, wherein if the moving object decelerates after reaching the second position, no radiation is emitted when time T is reached when the head of the moving object reaches the third position after reaching the second position and a third time interval has elapsed, the method further comprising: the radiation is emitted when the moving target head reaches the third position.
6. The method of claim 4, wherein the emission of radiation is stopped when the trailing portion of the moving object leaves the third position.
7. The fast-pass moving-target radiation inspection method according to claim 1, wherein, taking a time when the moving-target head reaches a fourth position in the detection channel as a reference time, the time T is later than the reference time by a fourth time interval, and the fourth time interval T4 is (K + L4)/V; with the fourth location being upstream of the radiation inspection location, a distance L4 from the radiation inspection location.
8. A fast-pass moving target radiation inspection system, comprising:
the radiation imaging device is used for emitting rays to scan the moving target and generate a radiation image;
the moving target information acquisition device is used for acquiring the length K of a part needing radiation avoidance in the moving target;
the moving speed acquisition device is used for acquiring the moving speed V of the moving target in the detection channel;
the radiation moment determining device is used for determining the moment T of the radiation imaging device for emitting rays based on the length K and the moving speed V;
a radiation control device for controlling the radiation imaging device to emit rays at the radiation inspection position for radiation inspection when the time T comes, and stopping emitting rays after the moving object leaves the radiation inspection position,
the moving speed acquisition means includes: a first detector and a second detector for emitting a signal when arrival or departure of a moving object is detected; wherein the first detector is at a distance of L1 from the radiation inspection position, the second detector is at a distance of L2 from the radiation inspection position, L1> L2, and both the first detector and the second detector are located on the upstream side of the radiation inspection position; the moving speed acquisition device obtains a moving speed V which is (L1-L2)/(t2-t1) based on signals sent by the first detector and the second detector, wherein t1 and t2 are the time when the moving target reaches the first detector and the second detector respectively.
9. The fast-pass moving object radiation inspection system according to claim 8, wherein the radiation timing determining means determines the timing T as a first time interval later than a reference timing with a timing at which the moving object reaches the second detector as the reference timing, the first time interval being (K + L2)/V at T1.
10. The fast-pass moving object radiation inspection system of claim 9, wherein the radiation timing determining means determines that the radiation imaging means stops emitting radiation at a time T' later than a second detector timing at which the trailing portion of the moving object leaves the second detector for a second time interval T2-b-L2/V, where b is a constant equal to or greater than 1.
11. The fast-pass moving target radiation inspection system of claim 8, wherein said radiation control means includes a third detector located downstream of the radiation inspection position at a distance L3 from the radiation inspection position, wherein L3 is less than or equal to a length K ', wherein K' is the minimum of the lengths of the portions of the various types of moving targets that require radiation to avoid; and the number of the first and second electrodes,
if the moving target is decelerated after reaching the second detector, so that the head of the moving target does not reach a third detector after reaching the second detector and passing a third time interval, the radiation control device controls the radiation imaging device not to emit rays when the time T arrives, wherein the third time interval is T3 ═ a (L2+ L3)/V, and a is a constant equal to or more than 1.
12. The fast pass moving object radiation inspection system of claim 11, wherein if the moving object decelerates after reaching the second detector such that the moving object head does not reach the third detector after reaching the second detector and a third time interval has elapsed, the radiation imaging device does not emit radiation when time T arrives, the radiation control device controls the radiation imaging device to emit radiation when the moving object head reaches the third detector.
13. The fast-pass moving object radiation inspection system of claim 11, wherein said radiation control device controls the radiation imaging device to stop emitting radiation when the trailing portion of the moving object leaves the third detector.
14. The system of claim 8, wherein the moving speed acquisition device comprises a tacheometer, a laser velocimeter, or a visual velocimeter.
15. The fast-pass moving target radiation inspection system of claim 14, wherein said radiation timing determining means includes at least one detector located on an upstream side of the radiation inspection position, a fourth detector of said at least one detector being located at a distance L4 from the radiation inspection position, said radiation timing determining means determines said time T to be later than a reference time by a fourth time interval T4 ═ K + L4)/V with reference to a time when the moving target head reaches the fourth detector.
16. The quick pass moving object radiation inspection system of claim 8, wherein said moving object information acquisition means comprises moving object identification means for acquiring identification data of the moving object and a moving object information database module; and the moving target information database module is used for determining the length K of the part needing radiation avoidance in the moving target according to the identity data of the moving target.
17. The rapid-pass moving-object radiation inspection system of claim 16, wherein the moving-object identification means comprises one or more of the following devices: license plate number identification equipment, RFID identification equipment, bar code identification equipment and two-dimensional code identification equipment.
18. The system of claim 8, wherein the moving object information acquiring means comprises an input module for inputting information on the length K of the portion of the moving object requiring radiation avoidance into the system.
19. The system of claim 8, wherein the moving object information acquiring means is pre-stored with information of a length K of a portion of the moving object requiring radiation avoidance.
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| CN201410168571.6A CN105022095B (en) | 2014-04-24 | 2014-04-24 | Quick-pass type mobile target radiation inspection method and system |
| PCT/CN2015/073554 WO2015161717A1 (en) | 2014-04-24 | 2015-03-03 | Method and system for conducting radiative inspection on rapid-pass moving object |
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| CN201410168571.6A CN105022095B (en) | 2014-04-24 | 2014-04-24 | Quick-pass type mobile target radiation inspection method and system |
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| CN107228869A (en) * | 2017-06-29 | 2017-10-03 | 北京君和信达科技有限公司 | Radiation checking system and radiation testing method |
| CN107228868A (en) * | 2017-06-29 | 2017-10-03 | 北京君和信达科技有限公司 | Radiation checking system and radiation testing method |
| CN107664774A (en) * | 2017-09-19 | 2018-02-06 | 北京君和信达科技有限公司 | radiation checking system and method |
| RU2668508C1 (en) * | 2017-12-14 | 2018-10-01 | Общество с ограниченной ответственностью "ИСБ.А" (ООО "ИСБ.А") | Load and self-propelled vehicle screening system, and method of automatic radioscopic control of moving objects for determination of a radiation scanning area in system of planning |
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| CN111325114B (en) * | 2020-02-03 | 2022-07-19 | 重庆特斯联智慧科技股份有限公司 | Security image processing method and device for artificial intelligence recognition classification |
| CN113805241A (en) * | 2020-05-29 | 2021-12-17 | 同方威视技术股份有限公司 | Radiation inspection apparatus |
| CN114764074A (en) * | 2020-12-31 | 2022-07-19 | 同方威视技术股份有限公司 | Radiation inspection system and radiation inspection method |
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| WO2015161717A1 (en) | 2015-10-29 |
| CN105022095A (en) | 2015-11-04 |
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