Disclosure of Invention
In view of this, the utility model provides a system for carry out radiation scanning to moving target adopts non-contact sensor to acquire moving target's characteristic information, eliminates the potential safety hazard.
The utility model provides a system for carry out radiation scanning to moving target, include: a radiation source for emitting radiation; the tag reader is used for reading information carried by a data information tag carried on a moving target and sending the information to the control module; the detection module is used for detecting the position of the moving target in the detection channel and sending a signal to the control module when the moving target reaches a preset position; the control module is used for controlling the process of emitting rays by the radiation source based on the information from the tag reader and the signal from the detection module; the radiation detector is used for receiving the rays passing through the radiation scanning area and converting the rays into digital signals; a radiation imaging device for generating a radiation image from the digital signal of the radiation detector; the information carried by the data information label comprises length information, and the length information indicates the length of a region needing radiation avoidance in the moving target or the length of a region needing low-dose-rate ray scanning.
Preferably, the information carried by the data information tag further includes radiation scanning mode information, and the radiation scanning mode information selectively indicates one of the following scanning modes: scanning a first part of a moving target without scanning and a second part of the moving target; scanning a first part of the moving target by using low-dose-rate rays, and scanning a second part of the moving target by using high-dose-rate rays; thirdly, scanning the whole moving target by low-dose-rate rays; fourthly, scanning the whole moving target by high-dose-rate rays; the whole moving target is not scanned; the first part of the moving target refers to a region which needs radiation avoidance or needs to be scanned by low dose rate rays in the moving target, and the second part of the moving target refers to a region which does not need radiation avoidance or does not need to be scanned by low dose rate rays in the moving target.
Preferably, the data information tag selectively adopts at least one of the following various tags: radio frequency identification RFID tags, two-dimensional graphic codes and bar codes.
Preferably, when the data information tag is an RFID tag, the system further comprises a triggering module for activating the tag reader upon detection of the arrival of a moving object.
Preferably, the detection module is a visual sensor.
Preferably, the detection module comprises a first detection submodule and a second detection submodule, wherein the first detection submodule is located on the upstream side of the radiation scanning area and is used for sending a signal to the control module when the moving target is about to enter the radiation scanning area; the second detection submodule is positioned at the downstream side of the radiation scanning area and used for sending a signal to the control module when the moving target travels a preset distance; the first/second detection sub-module selectively employs at least one of the following various sensors: photoelectric switch, light curtain, ground induction coil, pressure sensor.
Preferably, the radiation source selectively employs at least one of the following various radiation sources: an electron linear accelerator, an electron induction accelerator Betatron, a runway electron cyclotron RTM, a neutron generator, a Co-60 radioactive source, a Cs-137 radioactive source and an X-ray tube.
The utility model also provides a system for carry out radiation scanning to moving target, include: a radiation source for emitting radiation; the information reader is used for reading the characteristic information of the moving target and sending the characteristic information to the control module; the detection module is used for detecting the position of the moving target in the detection channel and sending a signal to the control module when the moving target reaches a preset position; the control module is used for controlling the process of emitting rays by the radiation source based on the characteristic information of the moving target from the information reader and the signal from the detection module; the radiation detector is used for receiving the rays passing through the radiation scanning area and converting the rays into digital signals; a radiation imaging device for generating a radiation image from the digital signal of the radiation detector; the information reader is connected with the database module, length information corresponding to the characteristic information of the moving target is stored in the database module, and the length information indicates the length of an area needing radiation avoidance in the moving target or the length of an area needing low-dosage-rate ray scanning.
The utility model has the advantages that:
1. the utility model discloses can accurately discern the scanning inspection mode that the moving object needs to go on, can accurately discern the length that the moving object needs to shield or the length of low dose rate ray scanning inspection.
2. The utility model discloses can realize complete high dose scanning inspection to cargo vehicle's goods.
3. To the occasion that allows to scan the passenger with low dose scanning mode, the utility model discloses can realize carrying out 100% complete quick scanning inspection to the moving target.
4. The utility model discloses have multiple scanning inspection mode, can scan the inspection to the moving target of different grade type for automatic check-out system's range of application is wider.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 shows a block diagram of a system for radiation scanning of a moving target according to the present invention, which includes:
a radiation source emitting radiation;
a tag reader for reading information carried by a data information tag mounted on a moving object and transmitting the information to the control module; the data information label is stored with length information, and the length information indicates the length of an area needing radiation avoidance in the moving target;
the detection module detects the position of the moving target in the detection channel and sends a signal to the control module when the moving target reaches a preset position;
a control module for controlling the process of emitting rays by the radiation source based on the information from the tag reader and the signal from the detection module;
a radiation detector that receives rays passing through a radiation scanning area and converts the rays into digital signals;
and a radiation imaging device which generates a radiation image from the digital signal of the radiation detector.
In the practical application scene, moving object can be all kinds of objects that need carry out the radiation scanning inspection, like the freight train of various models in going, motorbus, sedan-chair etc. or arrange various target object on the mobile station in, all can adopt the utility model discloses a system carries out the radiation scanning inspection.
In the embodiment of the present invention, the radiation source may be an accelerator radiation source, such as an electron linear accelerator (Betatron), a Betatron, a race track electron cyclotron (RTM), a neutron generator, etc.; radioactive sources such as Co-60, Cs-137, etc. may also be used; an X-ray tube may also be employed.
The embodiment of the present invention provides a data information tag, which can adopt a Radio Frequency Identification (RFID) tag, a bar code, a two-dimensional code, etc. Accordingly, the tag reader should employ an RFID tag reading device, a reading device of a barcode or a two-dimensional code, or the like. When the RFID tag is used, a trigger module can be additionally arranged for the radiation scanning system and used for activating the RFID tag reading equipment when the arrival of the moving object is detected.
In an embodiment of the present invention, the detection module can employ a vision sensor, and referring to fig. 2, a usage state diagram of the radiation scanning system when employing the vision sensor is shown. The moving object is a truck, which enters from the left side of the detection channel 110 and travels without interruption. Under the monitoring of the visual sensor 108, a truck first arrives at the position of the trigger module 101 (a photoelectric switch, a low-frequency trigger coil of an RFID tag, etc. can be used), the trigger module 101 is triggered to send a signal to the tag reader 102 to activate the tag reader 102, the tag reader 102 starts to read a data information tag carried on the truck to obtain length information, and assuming that the length is L (the length of a truck head is L, since a driver is at the truck head, radiation avoidance of the truck head should be implemented), the tag reader 102 sends the length information to the control module 106. Under the monitoring of the visual sensor 108, when the distance between the head of the truck and the radiation scanning area 103 is greater than or equal to L, the visual sensor 108 sends a signal to the control module 106, the control module 106 controls the radiation source 104 to start emitting rays according to the received signal, the cargo box of the truck is subjected to radiation scanning, and the radiation detector 105 and the radiation imaging device are subjected to receiving and imaging processing of the scanning rays.
The accurate radiation avoidance of the truck head is realized through the above processing. Because the length information of the headstock is obtained in advance, the system can not emit rays when the headstock enters a scanning area, and once the headstock leaves the scanning area, the radiation source immediately emits beams to scan the rest parts, so that the missing inspection of goods can be avoided to the maximum extent on the premise of ensuring the safety of personnel.
In the embodiment of fig. 2, a sensor 107 (e.g. a ground coil or a pressure sensor) may also be provided at the position of the scanning area 103, and the role is to perform the radiation scanning process only when the sensor 107 is triggered; if the sensor 107 is not triggered, indicating that no vehicle is driving in, then the radiation scanning procedure is not performed. The system can be prevented from being triggered by personnel who accidentally enter to start radiation scanning, so that accidental injury is caused to the personnel.
In an embodiment of the present invention, the detection module may also employ a series of sensor assemblies, see fig. 3, wherein, in order to detect whether a vehicle is about to enter the scanning area 103, a sensor assembly 109 is provided on the upstream side (left side in fig. 3) of the radiation source 104, and the sensor assembly 109 is in close proximity to the boundary of the scanning area 103; meanwhile, in order to detect the real-time position of the vehicle after entering the scanning area, the sensor assemblies 108 are arranged at the downstream side of the radiation source 104, and the sensor assemblies 108 are sequentially arranged along one side of the detection channel 110, and a certain distance can be reserved between two adjacent sensor assemblies when necessary. The sensor assemblies 108 and 109 may be implemented with any of the presently available types of sensors, such as photoelectric switches, light curtains, ground coils, pressure sensors, etc., or any combination thereof.
During a radiation scan, the embodiment of FIG. 3 differs from the embodiment of FIG. 2 in that when the sensor assembly 109 is triggered, it sends a signal to the control module 106 indicating that a vehicle head is about to enter the radiation scanning area 103; as the truck continues to travel, the sensor assemblies 108 will be triggered in turn, and since the sensor assemblies 108 are arranged in a manner that they are sequentially arranged along the aisle 110 and the positions and distances are known in advance so that they can record the displacement of the target object within the aisle 110, the control module 106 controls the radiation source 104 to start to emit a beam to scan the cargo box of the truck when the truck is displaced so that the truck leaves the scanning area 103, that is, the cargo box is about to enter the scanning area 103, according to the length L of the truck head previously obtained by the tag reader 102.
Fig. 4 shows a state diagram of the embodiment of fig. 3 in which the vehicle head passes through the scanning area 103, and fig. 4 omits the components such as the tag reader 102. When the sensor assembly 108 detects that the locomotive reaches the L position, the radiation source 104 emits a beam, so as to avoid missing detection of the cargo to the maximum extent on the premise of ensuring the safety of personnel.
On the other hand, according to the regulations of the relevant radiation safety standards, in addition to performing radiation avoidance on specific areas, such as the truck heads in fig. 2 and 3, instead of scanning, the areas may be subjected to radiation scanning with low dose rate rays, and parts not requiring radiation avoidance may be scanned with high dose rate rays, so that a hundred percent safety inspection on a target object may be realized within a radiation dose safety range.
In a practical application scenario, the moving object can be viewed as two parts, the first part is an area that needs to be scanned by low dose rate radiation, usually a region where a person is located, and the second part is an area that does not need to be scanned by low dose rate radiation, such as a region where goods are located.
Based on this, a suitable radiation scanning pattern is set for the moving object, and still taking the truck in fig. 2 as an example, the truck portion having a length L is a first portion, and the cargo box portion is a second portion, the scanning pattern can be set as: the first portion is scanned with low dose rate radiation and the second portion is scanned with high dose rate radiation. When a vehicle is scanned and inspected, the control module 106 is notified when the vision sensor 108 detects that a first part of the truck is about to enter the scanning area 103, the control module 106 enables the radiation source 104 to start to emit low-dose-rate rays (lower than the limit specified by radiation safety standards), the control module 106 is notified when the vision sensor 108 detects that the distance from the first part to the scanning area 103 is greater than or equal to L, and the control module 106 enables the radiation source 104 to convert the distance into high-dose-rate rays and scan a second part. In the present embodiment, the radiation source 104 is preferably an Betatron or a race track microtron RTM, which can rapidly realize the conversion of rays with different dose rates. According to the processing, the method meets the relevant radiation safety standard, realizes the whole-vehicle scanning of the vehicle, and greatly improves the security check reliability.
For the embodiment of fig. 3, the above-described scan mode may also be performed, and in particular, when the sensor assembly 109 is triggered, the control module 106 is notified that the first portion is about to enter the radiation scanning region 103, and the control module 106 causes the radiation source 104 to emit low dose rate radiation; as the truck continues to travel, the sensor assembly 108 is sequentially triggered, and according to the length L of the first portion obtained by the tag reader 102, when the distance from the first portion of the truck to the scanning area 103 is greater than or equal to L, the sensor assembly 108 notifies the control module 106 to convert the radiation source 104 into high dose rate radiation, and scans the second portion of the truck.
The utility model discloses an embodiment, with moving the whole passenger cabin as of target, for example sedan-chair or motorbus, need radiate the whole car and dodge or low dose rate scanning, should set up the scanning mode at this moment into: the whole moving target is not scanned, or the whole moving target is scanned by low-dosage-rate rays, so that the safety of personnel in the scanning process can be ensured.
The utility model discloses an in the embodiment, moving object is the goods of waiting to examine that is located the mobile station, then need not carry out any dodge or the adjustment of ray dose rate, and the reply should wait to examine that the goods is whole with high dose rate ray scanning.
To the setting of the above-mentioned radiation scanning mode to different grade type moving object, the utility model discloses save scanning mode information M in the data information label, together with the length information L who stores in the label, as the control foundation to the radiation source among the radiation scanning system.
Fig. 5 shows a logic block diagram of the control of the radiation source by the radiation scanning system of the present invention, when the moving target enters the detection channel, the tag reader will read the scanning mode information M and the length information L carried in the tag, and control the beam-out time of the radiation source and the dose rate of the beam-out ray according to the scanning mode, so as to scan the first part region where the personnel are located in the moving target, and scan the second part region where the personnel are not contained in the moving target; or the first partial area is scanned by low-dosage-rate rays, and the second partial area is scanned by high-dosage-rate rays; or scanning the whole moving target by low-dose-rate rays; or scanning the whole moving target by high-dose-rate rays; or not to scan the moving object with rays.
And when the moving target completely passes through the scanning area, controlling the radiation source to stop emitting rays, and finishing the radiation scanning inspection. The complete passing through the scanning area means that the tail of the moving object has left the boundary on the downstream side of the scanning area, and may also mean that the tail of the moving object has left the boundary on the downstream side of the scanning area and continues to advance by a certain distance, preferably less than 3 m.
Fig. 6 shows a data storage format of a data information tag according to an embodiment of the present invention, which is a definition of a radiation scanning pattern and a data structure of each part length, where a first byte of the definition is a data area and a subsequent part is a checksum. The data area length is 8, the highest bit U indicates whether the first part of the object is not scanned, the last 7 indicates the length of the first part in the moving object, and the unit is 0.05m, i.e. 1 indicates that the length of the first part of the moving object is 0.05m, wherein 127 indicates that the length of the first part is equal to the total length of the moving object (as shown in table 1 below). The subsequent n bits are checksum, which may be parity of 1 bit, or cyclic redundancy check CRC check of 8 bits or other bits. The checksum has the function of verifying the integrity of the data and preventing the data from being read and written wrongly. A checksum is not necessary. Table 1 shows a specific form of the above scanning mode and length data structure:
TABLE 1
Depending on the type of moving object and the length of the first portion of the moving object, the length information and information of the appropriate scanning pattern is stored in an RFID tag (or two-dimensional graphic code, bar code) that is placed inside the moving object or affixed to the outside of the moving object for use with the radiation scanning system. The RFID tags used may be passive, active or semi-active. Preferably a metal resistant RFID tag is used.
Furthermore, to the vehicle, it itself has only license plate number or vehicle identification number VIN, reflects the characteristic information of vehicle (the motorcycle type and the length information of each part of vehicle), therefore, the utility model discloses in also can replace radiation scanning system's label reader for information reader, the license plate number or the VIN sign indicating number of vehicle are read to the reader to connect a database module for this information reader, store scanning mode information M and length information L corresponding with license plate number or VIN sign indicating number in the database. The information is fed back to the system control module 106, the processing flow given in the above scheme is executed, and the radiation scanning inspection can be completed by adopting a proper scanning mode for vehicles of different vehicle types. In other embodiments, the tag reader may be reserved, and an information reader is added to the system, so that the information reader can read the license plate number or VIN code of the vehicle when the tag reader fails to acquire the data.
In the above embodiments of the present invention, when the length of the first part of the moving target is L, the length of the system performing radiation avoidance (or low dose rate scanning) is greater than or equal to L, where the length is set to be equal to L, which means that the first part is accurately avoided, and the control precision is high; the length is set to be larger than L, which means that the avoiding length is increased, and the device is a safer device and can prevent accidental radiation to personnel.
With respect to the first and second portions of the moving object defined in the present invention, for convenience of description, the first and second portions given in the embodiments are each continuous, and in other embodiments, the first portion may be discontinuous. For example: the cab of a large vehicle is provided with a driver, the middle part of the vehicle is provided with a cargo box, the tail of the vehicle is provided with a passenger seat, the first part of the moving target comprises the cab of the head of the vehicle and the passenger seat area of the tail of the vehicle, and the second part is provided with the cargo box in the middle. In contrast, at least the length L1 of the cab and the length L2 of the cargo box can be stored in the tag, and the scanning mode can be set accordingly, so that only the cargo box is scanned without scanning the front cab and rear passenger seat areas; or the areas of the cab and the seats of the passengers at the head of the vehicle are scanned at low dose rate, and the areas of the seats of the passengers at the tail of the vehicle are scanned at high dose rate.
The technical solution of the present invention is described in detail with reference to the specific embodiments, and the described specific embodiments are used to help understand the idea of the present invention. The derivation and modification made by the person skilled in the art on the basis of the specific embodiments of the present invention also belong to the protection scope of the present invention.