WO2016011804A1 - 对移动目标进行辐射扫描的系统、方法以及数据信息标签 - Google Patents

对移动目标进行辐射扫描的系统、方法以及数据信息标签 Download PDF

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Publication number
WO2016011804A1
WO2016011804A1 PCT/CN2015/072412 CN2015072412W WO2016011804A1 WO 2016011804 A1 WO2016011804 A1 WO 2016011804A1 CN 2015072412 W CN2015072412 W CN 2015072412W WO 2016011804 A1 WO2016011804 A1 WO 2016011804A1
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Prior art keywords
radiation
moving target
scanning
moving
information
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PCT/CN2015/072412
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English (en)
French (fr)
Inventor
王少峰
曹艳锋
闫雄
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北京君和信达科技有限公司
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
    • G06K19/06037—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking multi-dimensional coding
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
    • G06K19/06046—Constructional details
    • G06K19/06131—Constructional details the marking comprising a target pattern, e.g. for indicating the center of the bar code or for helping a bar code reader to properly orient the scanner or to retrieve the bar code inside of an image
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips

Definitions

  • the present invention relates to the field of radiation imaging technology, and in particular, to a system, method, and data information label for performing radiation scanning on a moving target.
  • the invention provides a system, a method and a data information label for performing radiation scanning on a moving target, and adopting a non-contact sensor to acquire feature information of the moving target.
  • the present invention provides a system for performing radiation scanning on a moving target, comprising: a radiation source for emitting radiation; and a tag reader for reading information carried by the data information tag carried on the moving target and transmitting the information a control module, configured to detect a position of the moving target in the detection channel, and send the control module to the control module when the moving target reaches the predetermined position And a control module, configured to control a process of emitting radiation by the radiation source based on information from the tag reader and a signal from the detection module; the radiation detector is configured to receive the radiation passing through the radiation scanning area and convert the signal into a digital signal; a radiation imaging device, configured to generate a radiation image according to the digital signal of the radiation detector; wherein the information carried by the data information tag includes length information, and the length information indicates a length of a region of the moving target that needs to be evaded or needs to be The length of the area scanned by the low dose rate ray.
  • 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 various scanning modes: 1 not scanning the first part of the moving target, and moving the target The second part of the scan; 2 the first part of the moving target is scanned with a low dose rate ray, the second part of the moving target is scanned with a high dose rate ray; 3 the moving target as a whole is scanned with a low dose rate ray; 4 pairs of moving targets The whole is scanned at a high dose rate; 5 pairs of moving targets are not scanned; wherein the first part of the moving target refers to the area of the moving target that needs radiation avoidance or the area that needs to be scanned with a low dose rate ray, the moving target The second part refers to the area of the moving target that does not require radiation avoidance or the area that does not need to be scanned at low dose rate rays.
  • the data information tag selectively employs at least one of the following various tags: a radio frequency identification RFID tag, a two-dimensional graphics code, a barcode.
  • the system further includes a triggering module for activating the tag reader upon detecting the arrival of the mobile target.
  • the detection module is a visual sensor.
  • the detecting module comprises a first detecting sub-module and a second detecting sub-module, wherein the first detecting sub-module is located on the upstream side of the radiation scanning area, and is configured to send a signal to the control module when the moving target is about to enter the radiation scanning area
  • the second detecting sub-module is located on the downstream side of the radiation scanning area, and is configured to send a signal to the control module when the moving target passes a predetermined distance;
  • the first detecting sub-module/second detecting sub-module selectively adopts the following various sensors At least one of: photoelectric switch, light curtain, ground sense coil, pressure sensor.
  • the radiation source selectively employs at least one of the following various radiation sources: an electron linac, an electron induction accelerator Betatron, a racetrack electron cyclotron RTM, a neutron generator, a Co-60 source, Cs-137 Radiation source, X-ray tube.
  • an electron linac an electron induction accelerator Betatron, a racetrack electron cyclotron RTM, a neutron generator, a Co-60 source, Cs-137 Radiation source, X-ray tube.
  • the invention also provides a system for performing radiation scanning on a moving target, comprising: a radiation source for emitting radiation; an information reader for reading feature information of the moving target, and transmitting the information to the control module; Detecting a position of the moving target in the detecting channel, and sending a signal to the control module when the moving target reaches the predetermined position; and a control module for using the moving target feature information from the information reader and the signal from the detecting module And controlling the process of emitting radiation by the radiation source; the radiation detector is configured to receive the radiation passing through the radiation scanning area and convert it into a digital signal; and the radiation imaging device is configured to generate a radiation image according to the digital signal of the radiation detector; wherein
  • the information reader is connected to the database module.
  • the database module stores length information corresponding to the moving target feature information, and the length information indicates the length of the region in the moving target that needs to be evaded or the length of the region that needs to be scanned at a low dose rate.
  • the invention also provides a method for performing radiation scanning on a moving target, comprising: obtaining a length of a first part of the moving target and a radiation scan required by the moving target by moving the data information tag carried on the moving target before the moving target enters the radiation scanning area Mode, wherein the first part refers to the part of the moving target that needs radiation avoidance or the part that needs to be scanned by the low dose rate ray; after the moving target enters the radiation scanning area, according to the position of the moving target, the radiation source is controlled according to the radiation scanning The mode scans the moving target; after the moving target leaves the radiation scanning area, the radiation source is controlled to stop the radiation scanning.
  • the invention also provides a data information tag, wherein the tag stores length information and radiation scanning mode information, the length information indicates a length of the first part in the object, and the radiation scanning mode information selectively indicates one of the following various scanning modes Species: 1 the first part of the target is not scanned, and the second part of the target is scanned; 2 the first part of the target is scanned at a low dose rate, and the second part of the target is scanned at a high dose rate; 3 The target object is scanned at a low dose rate as a whole; 4 pairs of the target object are scanned at a high dose rate; 5 pairs of the target are not scanned as a whole.
  • FIG. 1 is a block diagram showing the structure of a system for performing radiation scanning on a moving object of the present invention.
  • FIG. 2 is a schematic diagram showing the state of use of the system in accordance with an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a state of use of a system according to another embodiment of the present invention.
  • FIG. 4 is a schematic view showing a state in which the front end of the vehicle passes through the radiation scanning area in the embodiment of FIG. 3.
  • Figure 5 is a logic block diagram of the control of the radiation source by the radiation scanning system of the present invention.
  • Figure 6 is a data storage format of a data information tag in one embodiment of the present invention.
  • FIG. 1 is a block diagram showing the structure of a system for performing radiation scanning on a moving target according to the present invention, including:
  • a tag reader that reads information carried by the data information tag mounted on the mobile target and sends the information to the control module; wherein the data information tag stores a length information indicating that the mobile target needs radiation avoidance The length of the area;
  • a detection module that detects a position of the moving target in the detection channel and sends a signal to the control module when the moving target reaches the predetermined position
  • control module that controls the process of emitting radiation by the radiation source based on information from the tag reader and signals from the detection module;
  • a radiation detector that receives radiation passing through the radiation scanning area and converts it into a digital signal
  • a radiation imaging device that generates a radiation image based on a digital signal of the radiation detector.
  • the moving target can be used for various types of objects that need to be scanned for radiation, such as various types of trucks, large passenger cars, small cars, etc., or various targets placed on the mobile station. Radiation scanning inspection can be performed using the system of the present invention.
  • the radiation source may employ an accelerator source such as an electron linac, a betatron, a racetrack electron cyclotron (RTM), a neutron generator, etc.; Such as Co-60, Cs-137, etc.; X-ray tubes can also be used.
  • an accelerator source such as an electron linac, a betatron, a racetrack electron cyclotron (RTM), a neutron generator, etc.
  • RTM racetrack electron cyclotron
  • X-ray tubes can also be used.
  • the data information tag may be a Radio Frequency Identification (RFID) tag, or a barcode, a two-dimensional code, or the like.
  • RFID Radio Frequency Identification
  • the tag reader should use a reading device such as an RFID tag reading device, a barcode, or a two-dimensional code.
  • RFID tags it is also possible to add a trigger to the radiation scanning system.
  • the detection module may employ a visual sensor, and with reference to Figure 2, a usage state diagram of the radiation scanning system with the visual sensor is shown.
  • the moving target is a truck, which enters from the left side of the detecting passage 110 and runs without interruption. Under the monitoring of the visual sensor 108, the truck first arrives at the position of the trigger module 101 (which can use a photoelectric switch, a low frequency trigger coil of the RFID tag, etc.), and the trigger module 101 is triggered to send a signal to the tag reader 102 to activate the tag reading.
  • the trigger module 101 which can use a photoelectric switch, a low frequency trigger coil of the RFID tag, etc.
  • the tag reader 102 starts reading the data information tag mounted on the truck to obtain a length information, and assumes that the length is L (L is the length of the front end, and since the driver is in the front of the car, the radiation avoidance of the front end should be implemented).
  • the tag reader 102 transmits the length information to the control module 106.
  • the control module 106 Under the monitoring of the vision sensor 108, when the head of the truck has left the radiation scanning area 103 by a distance greater than or equal to L, the visual sensor 108 sends a signal to the control module 106, and the control module 106 controls the radiation source 104 to start according to the received signal.
  • the radiation is emitted, the cargo box of the truck is scanned for radiation, and the radiation detector 105 and the radiation imaging device perform scanning and imaging processing of the scanning rays.
  • the above treatment achieves accurate radiation avoidance of the truck head. Since the length information of the front of the vehicle is obtained in advance, the system can emit no radiation when the front of the vehicle enters the scanning area, and once the front of the vehicle leaves the scanning area, the radiation source is immediately beamed out, and the rest is scanned, thereby ensuring the safety of personnel. It can avoid the missed inspection of goods.
  • a sensor 107 eg, a sense coil or a pressure sensor
  • a sensor 107 may also be provided at the location of the scan area 103, such that the radiation scan flow is performed only when the sensor 107 is triggered; if the sensor 107 is not triggered, Note that no vehicle is entering, the radiation scanning process is not performed. It can prevent the system from being triggered by accidental entry and initiate radiation scanning, causing accidental injury to personnel.
  • the detection module may also employ a series of sensor assemblies, with reference to Figure 3, in order to detect whether the vehicle is about to enter the scanning area 103, on the upstream side of the radiation source 104 (left side in Figure 3) a sensor assembly 109 is provided, 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 after the vehicle enters the scanning area, a sensor assembly 108 is disposed on the downstream side of the radiation source 104, and the sensor assembly 108 is detected along the edge
  • the channels 110 are arranged one after the other, and when needed, between two adjacent sensor components Reserve a certain distance.
  • the sensor assemblies 108 and 109 described above may employ a variety of sensors currently available, such as photoelectric switches, light curtains, ground coils, pressure sensors, and the like, or combinations thereof.
  • the embodiment of FIG. 3 differs from the embodiment of FIG. 2 in that, when the sensor assembly 109 is triggered, it signals the control module 106 that the vehicle head is about to enter the radiation scanning area 103; As the truck continues to travel, the sensor assembly 108 will be triggered in turn, since the sensor assembly 108 is arranged in a sequential manner along the channel 110, and the position and distance are known in advance so that it can record the displacement of the target object within the channel 110, then The head length L obtained by the tag reader 102 before, when the displacement of the truck causes the head to leave the scanning area 103, that is, the container is about to enter the scanning area 103, at which time the control module 106 controls the radiation source 104 to start to beam out, to the truck. The container is scanned.
  • Fig. 4 is a view showing a state in which the front end of the embodiment of Fig. 3 passes through the scanning area 103, and components such as the tag reader 102 are omitted in Fig. 4.
  • the right side boundary of the scanning area 103 is used as a starting point (original point O)
  • the sensor component 108 detects that the front end of the vehicle reaches the L position
  • the radiation source 104 is out of the bundle, thereby maximally avoiding the missed inspection of the goods under the premise of ensuring the safety of personnel. .
  • the moving target can be divided into two parts.
  • the first part is the area that needs to be scanned by the low dose rate ray, usually the area where the person is located, such as the cab, and the second part is that the ray is not required at low dose rate.
  • the area scanned such as the area where the goods are located, such as a container.
  • the head of the length L is divided into the first part, and the part of the cargo box is the second part, and the scanning mode can be set to:
  • the low dose rate ray scans the first portion and scans the second portion at a high dose rate.
  • visual sensor 108 Upon inspection of the vehicle, visual sensor 108 notifies control module 106 when it detects that the first portion of the truck is about to enter scanning area 103, and control module 106 causes radiation source 104 to begin emitting low dose rate radiation (below the limits specified by radiation safety standards), The visual sensor 108 notifies the control module 106 when it detects that the first portion has left the scanning area 103 by a distance greater than or equal to L.
  • the control module 106 converts the radiation source 104 to emit a high dose rate ray to scan the second portion.
  • the radiation source 104 preferably employs an electronic induction accelerator Betatron or a track-type electron cyclotron RTM to rapidly convert the radiation of different dose rates. According to the above treatment, it not only meets the relevant radiation safety standards, but also realizes the vehicle full vehicle scanning, and the reliability of the security inspection is greatly improved.
  • the above scanning mode can also be performed. Specifically, when the sensor component 109 is triggered, the control module 106 is notified that the first portion is about to enter the radiation scanning area 103, and the control module 106 causes the radiation source 104 to emit a low dose rate ray. As the truck continues to travel, the sensor assembly 108 is triggered in sequence, according to the first portion length L obtained by the tag reader 102, when the first portion of the truck leaves the scanning region 103 at a distance greater than or equal to L, the sensor assembly 108 notifies the control module 106, The radiation source 104 is converted to emit a high dose rate ray to scan the second portion of the truck.
  • the entire moving target is used as a passenger compartment, such as a small car or a large passenger car, and the vehicle is subjected to radiation avoidance or low dose rate scanning.
  • the scanning mode should be set to: The overall scanning is not performed, or the entire target is scanned at a low dose rate, which ensures the safety of personnel during the scanning process.
  • the moving target is the goods to be inspected on the mobile station, and no evasive or radiation dose rate adjustment is required, and the whole of the goods to be inspected should be scanned at a high dose rate.
  • the present invention stores the scanning mode information M in the data information tag, together with the length information L stored in the tag, as a basis for controlling the radiation source in the radiation scanning system.
  • FIG. 5 is a block diagram showing the control logic of the radiation scanning system to the radiation source in some embodiments of the present invention.
  • the tag reader 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. According to the scanning mode, the timing of the exit of the radiation source and the dose rate of the emitted radiation are controlled, so that the first part of the moving target is not scanned, and the second part of the moving target is not scanned; or Scanning at a low dose rate for the first partial region, scanning at a high dose rate for the second partial region; or scanning at a low dose rate for the moving target as a whole; or shooting at a high dose rate for the moving target as a whole Line scan; or no radio scanning of the moving target as a whole.
  • the radiation source is controlled to stop emitting radiation, and the radiation scanning inspection is completed.
  • the complete passage of the scanning area means that the tail of the moving target has left the boundary of the downstream side of the scanning area, and may also mean that the tail of the moving target has left the boundary of the downstream side of the scanning area and continues to advance by a certain distance, preferably the distance is less than 3 m.
  • FIG. 6 is a data storage format of a data information tag according to some embodiments of the present invention, which is a definition of a radiation scan mode and a data structure of each part length proposed by the present invention, and the first byte of the definition is a data area.
  • the subsequent part is the checksum.
  • the length of the data area is 8, the highest position U indicates whether the first part of the target is not scanned, and the last 7 indicates the length of the first part of the moving target, the unit is 0.05 m, that is, 1 indicates that the first part of the moving target has a length of 0.05 m.
  • 127 indicates that the length of the first portion is equal to the total length of the moving target (Table 1 below).
  • checksums which may be 1-bit parity, or may be 8-bit or other bits of cyclic redundancy check CRC.
  • CRC cyclic redundancy check
  • the length information and the information of the appropriate scanning mode are stored in the RFID tag (or two-dimensional graphic code, barcode), and the tag is placed inside the mobile target or adhered to Move the outside of the target for use with a radiation scanning system.
  • the RFID tag used can be passive, active, or half Source.
  • An anti-metal RFID tag is preferably used.
  • the vehicle has a unique license plate number or vehicle identification code VIN, reflecting the characteristic information of the vehicle (the vehicle type and the length information of each part of the vehicle), and therefore, the label of the radiation scanning system can also be read in the present invention.
  • the extractor is replaced with an information reader, the reader reads the license plate number or VIN code of the vehicle, and connects a database module to the information reader, and stores scan mode information M corresponding to the license plate number or the VIN code in the database. And length information L.
  • This information is fed back to the system control module 106 to perform the processing flow given in the above scheme, and the same scanning mode can be implemented for the vehicles of different vehicle types to complete the radiation scanning inspection.
  • the tag reader may also be retained, and an information reader may be added to the system to read the license plate number or VIN code of the vehicle with the information reader if the tag reader fails to acquire data.
  • the length of the radiation avoidance (or low dose rate scan) of the system is greater than or equal to L, wherein the length is set equal to L, meaning that the first portion is The precise avoidance, high control precision; the length is set to be greater than L, which means that the avoidance length is increased, which is a safe setting to prevent accidental radiation to personnel.
  • the first portion and the second portion of the moving object defined in the present invention are each continuous, and in other embodiments, the first portion may be discontinuous. of.
  • the first portion of the moving target includes a cab of the front and a passenger seat area at the rear of the vehicle.
  • the second part is the middle of the container.
  • At least the length L1 of the cab and the length L2 of the container may be stored in the label, and the scanning mode is set correspondingly, the front cab and the rear passenger seat area are not scanned, only the container is scanned; or The front and rear passenger seat areas are scanned at a low dose rate and scanned at a high dose rate.
  • a scan check mode that can identify a moving target, and can identify the length of the moving target that needs to be shielded or scanned at a low dose rate.
  • the cargo containers of the cargo vehicles can be scanned at high dose rate.

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Abstract

一种对移动目标进行辐射扫描的系统，包括：辐射源（104），用于发出射线；标签读取器（102），用于读取搭载在移动目标上的数据信息标签所携带的信息，并发送给控制模块（106）；检测模块（108，109），用于检测移动目标在检测通道（110）中所处的位置，并在移动目标到达预定位置时，向控制模块（106）发出信号；控制模块（106），用于基于来自所述标签读取器（102）的信息以及来自所述检测模块（108，109）的信号，对辐射源（104）发出射线的过程进行控制；其中，数据信息标签所携带的信息中包含长度信息，所述长度信息指示移动目标中需要辐射避让的区域的长度或者需要以低剂量率射线扫描的区域的长度。利用上述系统可实现以多种扫描检查方式对不同类型的移动目标进行扫描检查。

Description

对移动目标进行辐射扫描的系统、方法以及数据信息标签 技术领域
本发明涉及辐射成像技术领域，具体涉及一种对移动目标进行辐射扫描的系统、方法以及数据信息标签。
背景技术
利用射线对移动目标，如车辆、货物等进行扫描检查是目前边境检查和海关查验的常用手段。随着日益严峻的反恐形势和打击走私的需要，需要对通过边境的车辆和通关的车辆进行全部检查。这就要求检查系统能够实现对移动目标进行自动快速扫描。对于车辆而言，就是需要司机不停车，驾驶车辆快速通过检查系统，加快检查速度。
针对这一需求，已有一些安检设备可以进行车辆的扫描检查，在扫描检查过程中一个最重要的问题是系统必须对车辆中乘员所在的区域进行避让，防止辐射伤害。对此，一般是采取预装的传感器检测车辆行驶状态，确保乘员所在的乘员舱驶过之后，再对车辆的货舱开始辐射扫描。
但是，由于传感器无法对车辆的乘员舱和货舱加以区别，也无法识别不同车辆乘员舱的长度，因此大多数这类车辆安检设备都采用偏安全的设计方式，即将系统设计为针对所有被检车辆总是避让一个固定长度，这个固定长度比市面上所有类型车辆的乘员舱的长度都大，从而确保对各类型被检车辆中人员的安全避让。
发明内容
本发明提出一种对移动目标进行辐射扫描的系统、方法以及数据信息标签，采用非接触式传感器获取移动目标的特征信息。
本发明提供一种对移动目标进行辐射扫描的系统，包括：辐射源，用于发出射线；标签读取器，用于读取搭载在移动目标上的数据信息标签所携带的信息，并发送给控制模块；检测模块，用于检测移动目标在检测通道中所处的位置，并在移动目标到达预定位置时，向控制模块发 出信号；控制模块，用于基于来自标签读取器的信息以及来自检测模块的信号，对辐射源发出射线的过程进行控制；辐射探测器，用于接收经过辐射扫描区域的射线，并转换成数字信号；辐射成像装置，用于根据辐射探测器的数字信号生成辐射图像；其中，数据信息标签所携带的信息中包含长度信息，长度信息指示移动目标中需要辐射避让的区域的长度或者需要以低剂量率射线扫描的区域的长度。
优选地，数据信息标签所携带的信息中还包含辐射扫描模式信息，辐射扫描模式信息选择性地指示以下各种扫描模式中的一种：①对移动目标的第一部分不予扫描，对移动目标的第二部分扫描；②对移动目标的第一部分以低剂量率射线扫描，对移动目标的第二部分以高剂量率射线扫描；③对移动目标整体以低剂量率射线扫描；④对移动目标整体以高剂量率射线扫描；⑤对移动目标整体不予扫描；其中，移动目标的第一部分指的是移动目标中需要辐射避让的区域或者需要以低剂量率射线扫描的区域，移动目标的第二部分指的是移动目标中不需要辐射避让的区域或者不需要以低剂量率射线扫描的区域。
优选地，数据信息标签选择性地采用以下各种标签中的至少一种：射频识别RFID标签、二维图形码、条形码。
优选地，当数据信息标签为RFID标签时，系统还包括触发模块，用于在检测到移动目标到达时激活标签读取器。
优选地，检测模块为视觉传感器。
优选地，检测模块包括第一检测子模块和第二检测子模块，其中，第一检测子模块位于辐射扫描区域的上游侧，用于在移动目标即将进入辐射扫描区域时，向控制模块发出信号；第二检测子模块位于辐射扫描区域的下游侧，用于在移动目标驶过预定距离时，向控制模块发出信号；第一检测子模块/第二检测子模块选择性地采用以下各种传感器中的至少一种：光电开关、光幕、地感线圈、压力传感器。
优选地，辐射源选择性地采用以下各种辐射源中的至少一种：电子直线加速器、电子感应加速器Betatron、跑道式电子回旋加速器RTM、中子发生器、Co-60放射源、Cs-137放射源、X射线管。
本发明还提供一种对移动目标进行辐射扫描的系统，包括：辐射源，用于发出射线；信息读取器，用于读取移动目标的特征信息，并发送给控制模块；检测模块，用于检测移动目标在检测通道中所处的位置，并在移动目标到达预定位置时，向控制模块发出信号；控制模块，用于基于来自信息读取器的移动目标特征信息以及来自检测模块的信号，对辐射源发出射线的过程进行控制；辐射探测器，用于接收经过辐射扫描区域的射线，并转换成数字信号；辐射成像装置，用于根据辐射探测器的数字信号生成辐射图像；其中，信息读取器与数据库模块相连，数据库模块中储存与移动目标特征信息对应的长度信息，长度信息指示移动目标中需要辐射避让的区域的长度或者需要以低剂量率射线扫描的区域的长度。
本发明还提供一种对移动目标进行辐射扫描的方法，包括：在移动目标进入辐射扫描区域之前，通过移动目标上搭载的数据信息标签获取移动目标中第一部分的长度和移动目标需要的辐射扫描模式，其中第一部分指的是移动目标中需要辐射避让的部分或者需要以低剂量率射线扫描的部分；在移动目标进入辐射扫描区域之后，根据移动目标所处的位置，控制辐射源按照辐射扫描模式对移动目标进行辐射扫描；在移动目标离开辐射扫描区域之后，控制辐射源停止辐射扫描。
本发明还提供一种数据信息标签，标签中储存有长度信息和辐射扫描模式信息，长度信息指示目标物中的第一部分的长度，辐射扫描模式信息选择性地指示以下各种扫描模式中的一种：①对目标物的第一部分不予扫描，对目标物的第二部分扫描；②对目标物的第一部分以低剂量率射线扫描，对目标物的第二部分以高剂量率射线扫描；③对目标物整体以低剂量率射线扫描；④对目标物整体以高剂量率射线扫描；⑤对目标物整体不予扫描。
附图说明
图1是本发明的对移动目标进行辐射扫描的系统结构框图。
图2是本发明一个实施例的系统使用状态示意图。
图3是本发明另一实施例的系统使用状态示意图。
图4是图3实施例中车辆的车头经过辐射扫描区域的状态示意图。
图5是本发明的辐射扫描系统对辐射源的控制逻辑框图。
图6是本发明一个实施例中数据信息标签的数据存储格式。
具体实施方式
以下结合附图以及具体实施例，对本发明的技术方案进行详细描述。
图1示出本发明的对移动目标进行辐射扫描的系统结构框图，包括：
辐射源，其发出射线；
标签读取器，其读取搭载在移动目标上的数据信息标签所携带的信息，并发送给控制模块；其中，数据信息标签中储存有一长度信息，该长度信息指示移动目标中需要辐射避让的区域的长度；
检测模块，其检测移动目标在检测通道中所处的位置，并在移动目标到达预定位置时向控制模块发出信号；
控制模块，其基于来自标签读取器的信息以及来自检测模块的信号，对辐射源发出射线的过程进行控制；
辐射探测器，其接收经过辐射扫描区域的射线并转换成数字信号；
辐射成像装置，其根据辐射探测器的数字信号生成辐射图像。
在实际应用场景中，移动目标可为各类需要进行辐射扫描检查的对象，如行驶中的各种型号的货车、大型客车、小型轿车等，或者是置于移动台上的各种目标物，均可采用本发明的系统进行辐射扫描检查。
在本发明的某些实施例中，辐射源可以采用加速器射线源，如电子直线加速器，电子感应加速器(Betatron)，跑道式电子回旋加速器(RTM)，中子发生器等；也可以采用放射源，如Co-60、Cs-137等；也可以采用X射线管。
在本发明的某些实施例中，数据信息标签可以采用射频识别(Radio Frequency Identification，RFID)标签，也可以采用条形码、二维码等。相应地，标签读取器应采用RFID标签读取设备、条形码或二维码等的读取设备。其中，当使用RFID标签时，还可以为辐射扫描系统增设一个触发 模块，用于在检测到移动目标到达时激活RFID标签读取设备。
在本发明的某些实施例中，检测模块可采用视觉传感器，参考图2，示出了采用视觉传感器时辐射扫描系统的使用状态图。其中，移动目标为一货车，从检测通道110左侧驶入，并不间断地行驶。在视觉传感器108的监测下，货车首先到达触发模块101(可采用光电开关、RFID标签的低频触发线圈等)位置处，触发模块101被触发后向标签读取器102发出信号，以激活标签读取器102，标签读取器102开始读搭载在货车上的数据信息标签，获得一长度信息，假设长度为L(L为车头的长度，由于驾驶员在车头，应实施车头的辐射避让)，标签读取器102将长度信息发送给控制模块106。在视觉传感器108的监测下，当货车的车头已经离开辐射扫描区域103距离大于等于L时，视觉传感器108向控制模块106发出信号，控制模块106根据接收到信号，控制模块106控制辐射源104开始发出射线，对货车的货箱进行辐射扫描，辐射探测器105和辐射成像装置进行扫描射线的接收和成像处理。
以上处理实现了对货车车头的精确辐射避让。由于事先获取了车头的长度信息，系统能够在车头进入扫描区域时不发出射线，而一旦车头离开扫描区域后，辐射源立即出束，对其余部分实施扫描，从而在确保人员安全的前提下，可最大限度地避免货物漏检。
在图2实施例中，还可在扫描区域103位置处设置传感器107(例如地感线圈或压力传感器)，作用是仅在传感器107被触发时才执行辐射扫描流程；如果传感器107没有被触发，说明没有车辆驶入，则不执行辐射扫描流程。可防止系统被意外进入的人员触发而启动辐射扫描，对人员造成意外伤害。
在本发明的某些实施例中，检测模块还可采用一系列传感器组件，参考图3，其中，为了检测车辆是否即将进入扫描区域103，在辐射源104的上游侧(图3中为左侧)设置有传感器组件109，且传感器组件109紧邻扫描区域103的边界；同时，为了检测车辆进入扫描区域之后的实时位置，在辐射源104的下游侧设置有传感器组件108，且传感器组件108沿检测通道110一边依次排开，需要时，相邻两个传感器组件之间可 预留一定距离。上述传感器组件108和109可采用目前已有的传感器种类，如光电开关、光幕、地感线圈、压力传感器等或其组合。
在辐射扫描过程中，与图2实施例相比，图3实施例的不同之处在于，当传感器组件109被触发时，其向控制模块106发出信号，表明车头即将进入辐射扫描区域103；随着货车继续行驶，传感器组件108将依次被触发，由于传感器组件108的设置方式是沿通道110依次排列，且位置和距离事先已知，使得其可以记录目标对象在通道110内的位移，则根据之前标签读取器102获得的车头长度L，当货车的位移使得车头离开扫描区域103时，也就是货箱将要进入扫描区域103，此时控制模块106控制辐射源104开始出束，对货车的货箱实施扫描。
图4示出了图3实施例中车头经过扫描区域103时的状态图，图4中省略了标签读取器102等部件。其中，以扫描区域103的右侧边界为起点(原点O)，当传感器组件108监测到车头到达L位置时，辐射源104出束，实现在确保人员安全的前提下最大限度地避免货物漏检。
另一方面，根据相关辐射安全标准的规定，除了对特定区域——例如图2和图3中的货车车头——实施辐射避让而不予扫描之外，也可以对这些区域以低剂量率射线进行辐射扫描，对不需要辐射避让的部分以高剂量率射线扫描，可以在辐射剂量安全范围内，实现对目标物的百分百安全检查。
在实际应用场景中，可将移动目标分为两部分看待，第一部分是需要以低剂量率射线扫描的区域，通常为人员所在的区域如驾驶室，第二部分是不需要以低剂量率射线扫描的区域，如货物所在的区域如货箱。
基于此，为移动目标设置适合的辐射扫描模式，仍以图2中的货车为例，其长度为L的车头部分为第一部分，货箱部分为第二部分，可将扫描模式设置为：以低剂量率射线扫描第一部分、以高剂量率射线扫描第二部分。对车辆扫描检查时，视觉传感器108检测到货车的第一部分即将进入扫描区域103时通知控制模块106，控制模块106令辐射源104开始发出低剂量率射线(低于辐射安全标准规定的限制)，视觉传感器108检测到第一部分已离开扫描区域103距离大于等于L时通知控制模块106， 控制模块106令辐射源104转换为发出高剂量率射线，对第二部分进行扫描。在本实施例中，辐射源104优选地采用电子感应加速器Betatron或者跑道式电子回旋加速器RTM，可快速实现不同剂量率射线的转换。按照上述处理既符合相关辐射安全标准，又实现了车辆全车扫描，安检可靠性大幅提高。
对于图3实施例，也可执行上述扫描模式，具体地，当传感器组件109被触发时通知控制模块106，表明第一部分即将进入辐射扫描区域103，控制模块106令辐射源104发出低剂量率射线；随着货车继续行驶，传感器组件108依次被触发，根据标签读取器102获得的第一部分长度L，当货车的第一部分离开扫描区域103距离大于等于L时，传感器组件108通知控制模块106，令辐射源104转换为发出高剂量率射线，对货车第二部分进行扫描。
在本发明的某些实施例中，将移动目标整体作为乘员舱，例如小型轿车或大型客车，需对整车进行辐射避让或低剂量率扫描，这时应将扫描模式设置为：对移动目标整体不予扫描，或者对移动目标整体以低剂量率射线扫描，都可以确保扫描过程中的人员安全。
在本发明的一个实施例中，移动目标是位于移动台上的待检货物，则不需要进行任何避让或射线剂量率调整，应对该待检货物整体以高剂量率射线扫描。
对于上述针对不同类型移动目标的辐射扫描模式的设置，本发明将扫描模式信息M存储于数据信息标签中，连同标签中储存的长度信息L，作为辐射扫描系统中对辐射源的控制依据。
图5示出了本发明某些实施例中辐射扫描系统对辐射源的控制逻辑框图，当移动目标进入检测通道，标签读取器将读取其标签中携带的扫描模式信息M和长度信息L，按照扫描模式来控制辐射源的出束时机和出束射线的剂量率，实现对移动目标中人员所在的第一部分区域不予扫描、对移动目标中不包含人员的第二部分区域扫描；或是对第一部分区域以低剂量率射线扫描、对第二部分区域以高剂量率射线扫描；或是对移动目标整体以低剂量率射线扫描；或是对移动目标整体以高剂量率射 线扫描；或是对移动目标整体不予射线扫描。
当移动目标完全通过扫描区域时，控制辐射源停止发出射线，完成辐射扫描检查。完全通过扫描区域是指移动目标的尾部已经离开扫描区域下游侧的边界，也可以是指移动目标的尾部已经离开扫描区域下游侧的边界并继续前进一定的距离，优选的该距离小于3m。
图6所示为本发明某些实施例中数据信息标签的数据存储格式，是对本发明提出的辐射扫描模式和各部分长度数据结构的一种定义，该定义的第一个字节为数据区，后续的部分为校验和。数据区长度为8，最高位U表示是否对目标物的第一部分不予扫描，后7表示移动目标中第一部分的长度，单位为0.05m，即1表示移动目标的第一部分长度为0.05m，其中127表示第一部分的长度等于移动目标的总长(如下文表1)。后续的n位为校验和，可以是1位的奇偶校验，也可以是8位或者其他位数的循环冗余校验CRC校验。该校验和的作用是用来校验数据的完整性，防止数据的读写错误。校验和不是必须的。表1给出了一种上述扫描方式和长度数据结构的具体形式：
Figure PCTCN2015072412-appb-000001
表1
根据移动目标的类型和移动目标中第一部分的长度，将长度信息和适合的扫描模式的信息存储在RFID标签(或二维图形码、条形码)中，将标签置于移动目标内部或粘附于移动目标外部，以便与辐射扫描系统配合使用。使用的RFID标签可以是无源的，也可以是有源的，或者半有 源的。优选地使用抗金属RFID标签。
此外，对于车辆而言，其本身具有唯一的车牌号码或车辆识别码VIN，反映车辆的特征信息(车型和车辆各部分的长度信息)，因此，本发明中也可将辐射扫描系统的标签读取器替换为信息读取器，读取器读取车辆的车牌号码或VIN码，并为该信息读取器连接一数据库模块，在数据库中存储与车牌号码或VIN码对应的扫描模式信息M和长度信息L。将这些信息反馈给系统控制模块106，执行上述方案中给出的处理流程，同样可以实现对不同车型的车辆采用适合的扫描模式，完成辐射扫描检查。在其它实施例中，也可以保留标签读取器，而为系统增设信息读取器，在标签读取器获取数据失败的情况下，以信息读取器读取车辆的车牌号码或VIN码。
在本发明的上述实施例中，当移动目标的第一部分长度为L时，系统进行辐射避让(或低剂量率扫描)的长度大于等于L，其中，长度设置为等于L，意味着对第一部分的精确避让，控制精度高；长度设置为大于L，意味着加大了避让长度，是一种偏安全的设置，可防止对人员意外辐射。
关于本发明中定义的移动目标的第一部分和第二部分，为描述方便，实施例中给出的第一部分和第二部分是各自连续的，在其它实施例中，第一部分有可能是不连续的。例如：某种大型车辆的驾驶室有驾驶员，车辆的中间部分为货箱，车辆的车尾设置有乘员座位，则该移动目标中的第一部分包括车头的驾驶室和车尾的乘员座位区域，第二部分为中间的货箱。对此，可在标签中至少存储驾驶室的长度L1和货箱的长度L2，并相应设置扫描模式，对车头驾驶室和车尾乘员座位区域不予扫描、仅对货箱进行扫描；或者对车头驾驶室和车尾乘员座位区域以低剂量率扫描、对货箱以高剂量率扫描。
本发明的实施例具有以下优点：
1、能够识别移动目标需要的扫描检查模式，能够识别移动目标中需要屏蔽或者低剂量率扫描的长度。
2、可以对载货车辆的货箱全部以高剂量率射线扫描。
3、当允许以低剂量率射线扫描车辆乘员时，可以执行对车辆的整体快速扫描检查。
4、具有多种扫描检查模式，可对不同类型的车辆实施扫描检查，应用范围广。
以上，结合具体实施例对本发明的技术方案进行了详细介绍，所描述的具体实施例用于帮助理解本发明的思想。本领域技术人员在本发明具体实施例的基础上做出的推导和变型也属于本发明保护范围之内。

Claims (15)

  1. 一种对移动目标进行辐射扫描的系统，其特征在于，包括：
    辐射源，用于发出射线；
    标签读取器，用于读取搭载在移动目标上的数据信息标签所携带的信息，并发送给控制模块；
    检测模块，用于检测移动目标在检测通道中所处的位置，并在移动目标到达预定位置时，向控制模块发出信号；
    控制模块，用于基于来自所述标签读取器的信息以及来自所述检测模块的信号，对辐射源发出射线的过程进行控制；
    辐射探测器，用于接收经过辐射扫描区域的射线，并转换成数字信号；
    辐射成像装置，用于根据辐射探测器的数字信号生成辐射图像；其中，
    所述数据信息标签所携带的信息中包含长度信息，所述长度信息指示移动目标中需要辐射避让的区域的长度或者需要以低剂量率射线扫描的区域的长度。
  2. 如权利要求1所述的对移动目标进行辐射扫描的系统，其特征在于，所述数据信息标签所携带的信息中还包含辐射扫描模式信息，所述辐射扫描模式信息选择性地指示以下各种扫描模式中的一种：①对移动目标的第一部分不予扫描，对移动目标的第二部分扫描；②对移动目标的第一部分以低剂量率射线扫描，对移动目标的第二部分以高剂量率射线扫描；③对移动目标整体以低剂量率射线扫描；④对移动目标整体以高剂量率射线扫描；⑤对移动目标整体不予扫描；其中，移动目标的第一部分指的是移动目标中需要辐射避让的区域或者需要以低剂量率射线扫描的区域，移动目标的第二部分指的是移动目标中不需要辐射避让的区域或者不需要以低剂量率射线扫描的区域。
  3. 如权利要求1或2所述的对移动目标进行辐射扫描的系统，其特征在于，所述数据信息标签选择性地采用以下各种标签中的至少一种：射频识别RFID标签、二维图形码、条形码。
  4. 如权利要求3所述的对移动目标进行辐射扫描的系统，其特征在于，当所述数据信息标签为RFID标签时，所述系统还包括触发模块，用于在检测到移动目标到达时激活所述标签读取器。
  5. 如权利要求1或2所述的对移动目标进行辐射扫描的系统，其特征在于，所述检测模块为视觉传感器。
  6. 如权利要求1或2所述的对移动目标进行辐射扫描的系统，其特征在于，所述检测模块包括第一检测子模块和第二检测子模块，其中，
    第一检测子模块位于辐射扫描区域的上游侧，用于在移动目标即将进入辐射扫描区域时，向控制模块发出信号；
    第二检测子模块位于辐射扫描区域的下游侧，用于在移动目标驶过预定距离时，向控制模块发出信号；
    第一检测子模块/第二检测子模块选择性地采用以下各种传感器中的至少一种：光电开关、光幕、地感线圈、压力传感器。
  7. 如权利要求1或2所述的对移动目标进行辐射扫描的系统，其特征在于，所述辐射源选择性地采用以下各种辐射源中的至少一种：电子直线加速器、电子感应加速器Betatron、跑道式电子回旋加速器RTM、中子发生器、Co-60放射源、Cs-137放射源、X射线管。
  8. 一种对移动目标进行辐射扫描的系统，其特征在于，包括：
    辐射源，用于发出射线；
    信息读取器，用于读取移动目标的特征信息，并发送给控制模块；
    检测模块，用于检测移动目标在检测通道中所处的位置，并在移动目标到达预定位置时，向控制模块发出信号；
    控制模块，用于基于来自所述信息读取器的移动目标特征信息以及来自所述检测模块的信号，对辐射源发出射线的过程进行控制；
    辐射探测器，用于接收经过辐射扫描区域的射线，并转换成数字信号；
    辐射成像装置，用于根据辐射探测器的数字信号生成辐射图像；其中，
    所述信息读取器与数据库模块相连，数据库模块中储存与所述移动 目标特征信息对应的长度信息，所述长度信息指示移动目标中需要辐射避让的区域的长度或者需要以低剂量率射线扫描的区域的长度。
  9. 如权利要求8所述的对移动目标进行辐射扫描的系统，其特征在于，所述数据库模块中还储存辐射扫描模式信息，所述辐射扫描模式信息选择性地指示以下各种扫描模式中的一种：①对移动目标的第一部分不予扫描，对移动目标的第二部分扫描；②对移动目标的第一部分以低剂量率射线扫描，对移动目标的第二部分以高剂量率射线扫描；③对移动目标整体以低剂量率射线扫描；④对移动目标整体以高剂量率射线扫描；⑤对移动目标整体不予扫描；其中，移动目标的第一部分指的是移动目标中需要辐射避让的区域或者需要以低剂量率射线扫描的区域，移动目标的第二部分指的是移动目标中不需要辐射避让的区域或者不需要以低剂量率射线扫描的区域。
  10. 如权利要求8或9所述的对移动目标进行辐射扫描的系统，其特征在于，所述移动目标为车辆，所述特征信息是车辆识别码VIN。
  11. 一种对移动目标进行辐射扫描的方法，其特征在于，包括：
    在移动目标进入辐射扫描区域之前，通过移动目标上搭载的数据信息标签获取移动目标中第一部分的长度和移动目标需要的辐射扫描模式，其中所述第一部分指的是移动目标中需要辐射避让的部分或者需要以低剂量率射线扫描的部分；
    在移动目标进入辐射扫描区域之后，根据移动目标所处的位置，控制辐射源按照辐射扫描模式对移动目标进行辐射扫描；
    在移动目标离开辐射扫描区域之后，控制辐射源停止辐射扫描。
  12. 如权利要求11所述的对移动目标进行辐射扫描的方法，其特征在于，所述辐射扫描模式为以下各种扫描模式中的一种：①对移动目标的第一部分不予扫描，对移动目标的第二部分扫描；②对移动目标的第一部分以低剂量率射线扫描，对移动目标的第二部分以高剂量率射线扫描；③对移动目标整体以低剂量率射线扫描；④对移动目标整体以高剂量率射线扫描；⑤对移动目标整体不予扫描；其中第二部分指的是移动目标中不需要辐射避让的部分或者不需要以低剂量率射线扫描的部分。
  13. 一种数据信息标签，其特征在于，标签中储存有长度信息和辐射扫描模式信息，所述长度信息指示目标物中的第一部分的长度，所述辐射扫描模式信息选择性地指示以下各种扫描模式中的一种：①对目标物的第一部分不予扫描，对目标物的第二部分扫描；②对目标物的第一部分以低剂量率射线扫描，对目标物的第二部分以高剂量率射线扫描；③对目标物整体以低剂量率射线扫描；④对目标物整体以高剂量率射线扫描；⑤对目标物整体不予扫描。
  14. 如权利要求13所述的数据信息标签，其特征在于，所述数据信息标签是RFID标签、二维图形码或条形码。
  15. 如权利要求13所述的数据信息标签，其特征在于，标签中数据区长度为8位，最高位表示是否对目标物的第一部分不予扫描，数据区的后7位表示目标物的第一部分的长度。
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