CN104374785B - A kind of continuous radiation scanning system and method - Google Patents
A kind of continuous radiation scanning system and method Download PDFInfo
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- CN104374785B CN104374785B CN201410647357.9A CN201410647357A CN104374785B CN 104374785 B CN104374785 B CN 104374785B CN 201410647357 A CN201410647357 A CN 201410647357A CN 104374785 B CN104374785 B CN 104374785B
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- 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
Abstract
The invention discloses a kind of continuous radiation scanning system, it includes：Radiation source, collimater, radiation detector, imaging device, the first detection unit (105), the second detection unit (108) and control module；Wherein, whether the first detection unit (105) is used to detecting object reaches precalculated position, the precalculated position be located at the upstream of scanning area and with the upstream lateral boundaries of scanning area apart the first length L1；The scanning area is the region covered in sense channel by radiation source ray；Second detection unit (108) is used to detect to need to have been moved off needing that with the part of high dose rate ray scanning scanning area will be entered in scanning area and object with the part of low dose rate ray scanning in object；Control module is used to receive the signal from each detection unit and radiation source is controlled according to signal.A large amount of vehicles to be checked can be achieved continuously quickly through sense channel using the present invention, complete radiation scanning inspection.
Description
Technical field
The present invention relates to radiography field, and the field of Rapid radiating imaging is particularly carried out to mobile target, is had
Body is related to a kind of continuous radiation scanning system and method.
Background technology
The conventional means that inspection is current border control and customs inspection is scanned to vehicle, goods etc. using ray.
With increasingly serious anti-terrorism situation and the needs cracked down on smuggling, it is necessary to carry out radiation scanning inspection to all vehicles of clearance.
In the case where clearance vehicle fleet size is numerous, in order to improve inspection efficiency, it is necessary to Rapid radiating imaging is implemented to mobile vehicle,
Scanning is completed within the time short enough, so, vehicle to be checked can receive scanography, safety check effect in the case of not parking
Rate is high.In this scanography technology rapidly, continuously, a sixty-four dollar question is need to be to the area where occupant in vehicle
Domain is avoided, and prevents radiation injury, must not be higher than coherent radiation safety standard rule to the roentgen dose X rate of occupant region
Fixed limitation, such as the dosage safety limit value of ANSI N43.17, IEC62463 requirement.At present, this Rapid radiating scanning can be achieved
The equipment of safety check mainly has two types.
The first is not differentiate between occupant region in vehicle (driver's cabin of such as headstock) and goods region is (such as large-scale
The aft cargo compartment of lorry), it is whole to vehicle to be checked to use low dose rate ray scanning.The advantages of this scheme is with single low
Close rate ray is scanned, and the control logic of system is simple, and input cost is low.But due to whole using indiscriminate low
Close rate ray scanning, the penetration capacity of ray is not high, contrast resolution ratio is low, and radiant image quality is had a great influence, and limits
The suspicion quality testing output capacity of this kind equipment.
Be to discriminate between automotive occupant region and goods region second, to occupant region in vehicle to be checked with
Low dose rate ray scanning, to goods region with high dose rate ray scanning.Low dose rate ray is namely first sent to sweep
Retouch headstock (driver's cabin), after send high dose rate ray scanning cargo hold.The advantages of this scheme is before personal security is ensured
Put, improve the suspicion quality testing output capacity of equipment.But this radiation scanning rays safety detection apparatus must be total to other auxiliary equipment
With use, for example the instruction device such as traffic lights and/or pin must be set in the porch of sense channel to scanning process
It is controlled, in Current vehicle scanning process, instruction device keeps off subsequent vehicle outside sense channel, and front truck inspection terminates
Afterwards, reboot rear car and enter sense channel.If being not provided with this kind of instruction device, rear car is possible to be strayed into sense channel, causes
The dosage that rear car occupant receives exceedes safety limit, or even the high dose rate ray that the headstock of rear car is being emitted be present and sweep by mistake
Danger, for this, some safety check places even need to arrange for special messenger and aid in guiding, and plant maintenance and human cost are high.
The content of the invention
In view of this, the present invention proposes a kind of continuous radiation scanning system and method, by scanning area
Swim side and secure border is set, car state before and after monitoring, control the mode of operation of radiation source, the generation swept by mistake can be prevented, it is ensured that car
The acceptable dose of occupant is below safety limit.
The present invention provides a kind of continuous radiation scanning system, and it includes：Radiation source, collimater, radiation detector
And imaging device, it is characterised in that also include：First detection unit (105), the second detection unit (108) and control module；Its
In, the first detection unit (105) is used to detect whether object reaches precalculated position, and the precalculated position is located at scanning area
Upstream and with the upstream lateral boundaries of scanning area at a distance of the first length L1；Wherein, the scanning area is by spoke in sense channel
Penetrate the region of source ray covering；Second detection unit (108) is used to detect to need in object with low dose rate ray scanning
Part has been moved off needing that with the part of high dose rate ray scanning scanning area will be entered in scanning area and object；Control
Molding block is used to receive the signal from each detection unit and radiation source is controlled according to signal；Wherein, object is worked as
Reach the precalculated position and when radiation source is scanned with high dose rate ray, the control module control radiation source turns
It is changed to and is scanned with low dose rate ray.
Preferably, wherein the first length L1 is more than or equal to 1 meter.
Preferably, wherein the second detection unit (108) be located at the downstream of scanning area and with scanning area downstream lateral boundaries
At a distance of the second length L2.
Preferably, wherein the second detection unit (108) includes optoelectronic switch and light curtain, wherein, optoelectronic switch is located at distance
At ground level H, light curtain is located at immediately below optoelectronic switch on ground, optoelectronic switch and light curtain to scanning area downstream lateral boundaries
Distance is the second length L2.
Preferably, wherein height H is more than or equal to 2 meters, and the second length L2 is more than or equal to 2.5 meters.
Preferably, the system further comprises the 3rd detection unit (106), positioned at the first detection unit and scanning area it
Between, and the upstream side Boundary Nearest of the 3rd detection unit and scanning area.
Preferably, the system further comprises the 4th detection unit (107), and it is located at scanning area and the second detection unit
Between, and the downstream Boundary Nearest of the 4th detection unit and scanning area.
Preferably, the system further comprises the 5th detection unit (109), and it is located inside scanning area, and the 5th inspection
Survey downstream lateral boundaries of the unit close to scanning area.
Preferably, the system further comprises the 6th detection unit (112), its be located at the entrance and exit of sense channel it
Between, when object is vehicle, the 6th detection unit is used for the number-plate number, vehicle identification code VIN and/or the packaging for identifying vehicle
Case case number (CN).
Preferably, velocity radar or vision sensor are installed between the entrance and exit of sense channel.
Preferably, buffering area, buffering area are provided between the downstream lateral boundaries of scanning area and the outlet of sense channel
It is the part sense channel that length is L3；When the car speed in buffering area is less than predetermined speed, control module control radiation
Scanning system break-off, sense channel is closed, when there is no vehicle in buffering area, control module control radiation scanning system
Resume work, reopen sense channel.
Preferably, the length L3 of buffering area is more than or equal to 20 meters, predetermined speed 3km/h.
Preferably, traffic lights and/or pin are installed in the porch of sense channel.
The present invention also provides a kind of continuous radiation scanning methods, and the ray sent with radiation source is in sense channel
Vehicle be scanned, this method includes：The first step, when detecting that the first vehicle will enter scanning area, with low dosage
Rate ray is scanned；Second step, needed in the first vehicle with the part of low dose rate ray scanning leave scanning area it
Afterwards, when and needing to enter scanning area with the part of high dose rate ray scanning, be converted to and be scanned with high dose rate ray；
3rd step, after the first vehicle leaves scanning area completely, stop scanning；Wherein, in second step, penetrated with high dose rate
It is right immediately if detecting that the second vehicle in sense channel has arrived at predetermined secure border during line is scanned
Radiation source is controlled, and will be scanned to be converted to high dose rate ray and is scanned with low dose rate ray；4th step,
When detecting that the second vehicle enters scanning area, continue to be scanned with low dose rate ray；5th step, using the second vehicle as
The first new vehicle, is transferred to second step；Wherein, secure border is located at the upstream of scanning area, secure border and scanning area
The distance between upstream lateral boundaries are predetermined length L1.
Beneficial effects of the present invention：The present invention can do low dose rate ray scanning to the driving cabin of goods carrying vehicle, to goods
High dose rate ray scanning is done in cabin, and to passenger carrying vehicle, then vehicle does low dose rate ray scanning, is ensuring driver and crew's safety
Under the premise of, there is higher suspicion quality testing output capacity；Importantly, the present invention continuously enters the situation of sense channel for more cars
There is provided secure border, realizes the automatic switchover of scan pattern, can very prevent to sweep by mistake so that a large amount of vehicles to be checked can
Continuously quickly through sense channel, to complete radiation scanning inspection, detection efficiency is high.
Brief description of the drawings
Fig. 1 is the type of four kinds of typical vehicles.
Fig. 2 is a kind of top view of typical radiation scanning sense channel.
Fig. 3 is the top view of the continuous radiation scanning system of the embodiment of the present invention.
Fig. 4 is the side view of Fig. 3 embodiments.
Fig. 5-7 is the schematic diagram for having vehicle V1 and vehicle V2 to continue through in Fig. 3 sense channels.
Fig. 8 and Fig. 9 is the radiation scanning system side view of two embodiments of the invention.
Figure 10 and Figure 11 is the system job state transition diagram of the present invention.
Figure 12 is the system top view for being provided with buffering area etc. of the embodiment of the present invention.
Figure 13 is the corresponding relation figure of scan image of the embodiment of the present invention and identifier.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical scheme is described in detail.
Fig. 1 schematically illustrates several different types of vehicles, such as (1) is common goods carrying vehicle, such as container car, card
Car, the gap between headstock and cargo hold not can recognize that.(2) it is container-type goods carrying vehicle, the gap between headstock and container
It is recognizable.(3) it is to drag the container-type goods carrying vehicles of two containers.(4) it is small-sized passenger carrying vehicle, such as car.To show Fig. 1
Exemplified by several vehicles gone out are scanned, principle, the course of work and the ins and outs of the present invention are described.The applicable object of the present invention
The vehicle shown in Fig. 1 is not limited to, is also applied for similar all vehicles.
Fig. 2 schematically illustrates a kind of top view of typical sense channel.Wherein, radiographic source 101 sends ray, penetrates
Certain space is covered in sense channel after the outgoing of line collimator, vehicle receives ray scanning when passing through this segment space, this
Segment space is labeled as scanning area 104.Radiation detector array 102 receives the ray through scanning area 104, for the later stage
Imaging.Control module 103 controls the working condition of radiographic source 101.Conventional collimater, imaging device are eliminated in Fig. 2 and is showed
Field radiation protection wall etc..
Fig. 3 is the radiation scanning system top view of the embodiment of the present invention, and Fig. 4 is the side view of Fig. 3 embodiments, is saved in Fig. 4
Radiographic source 101, radiation detector array 102 and control module 103 are omited.During work, vehicle to be checked is from sense channel upstream side
The entrance of (being left side in figure) drives into.
In this embodiment, multiple detection units 105,106 and 108, each detection unit are disposed with sense channel
Can be the combination of photoelectric sensor, metal sensor, pressure sensor, vision sensor, or multiple sensors, such as
Can be using ground induction coil and light curtain combination as a detection unit.
Wherein, detection unit 105 is located at the pre-position of the upstream side of scanning area 104, the upstream with scanning area 104
Lateral boundaries can be considered " secure border " at a distance of specific range L1, the position of detection unit 105.During work, if detection unit
105 are triggered, and show have vehicle to reach secure border, now, are penetrated if radiographic source 101 is sent with high dose rate pattern
Line, then need to be converted into low dose rate pattern immediately, the vehicle head part for avoiding the car from continuing where traveling causes personnel connects
By high dose rate ray, so that it is guaranteed that the dosage that rear car occupant receives prevents the generation swept below safety limit by mistake.
Meanwhile detection unit 105 can also be used to detect whether vehicle will enter scanning area.If detection unit 105
It is triggered, shows that vehicle will extend over secure border and enter scanning area 104.Due to the necessarily headstock entered at first, therefore
Detection unit 105 should start with low dose rate Mode scans when being triggered.
Preferably, L1 is more than or equal to 1m, and detection unit 105 can use light curtain.
Detection unit 108 is located at the downstream of scanning area 104, and the downstream lateral boundaries with scanning area 104 are at a distance of specific
Distance L2, and it is H to detect height；Wherein, L2 is more than or equal to the length of most long headstock, such as in all types of vehicles, container
The headstock length of lorry is 2.5 meters, and the headstock length of other vehicles is respectively less than the value, then L2 >=2.5 meter.Detection height H can be set
For 2 meters, 2 meters of vehicle, such as small-sized passenger vehicle are highly less than for headstock, will not detection trigger unit 108.
The detection unit 108 is mainly used in performing three functions：Need to be with low in the type of vehicle, 2. detection vehicle 1. detecting
Whether the part (headstock) of close rate ray scanning has sailed out of scanning area 104 and has 3. detected whether vehicle has integrally been sailed
From scanning area 104.In an embodiment of the present invention, detection unit 108 suitably uses the combination of multiple sensors, a kind of preferred
Combination be optoelectronic switch and light curtain.Wherein, optoelectronic switch is arranged on highly locates apart from ground H, 1. individual for performing the
Function；Light curtain is arranged on the ground immediately below the optoelectronic switch, for perform the 2. with the 3. individual function.During work, if
Optoelectronic switch is triggered, and the type for showing vehicle is lorry (headstock is highly more than 2 meters), and now light curtain will necessarily also be triggered,
Show that headstock has sailed out of scanning area 104, enter scanning area 104 after this is that the cargo hold of vehicle (should now be converted to
High dose rate Mode scans), when light curtain reverts to non-triggering state, show that the tailstock has sailed out of detection unit 108, Ye Jiche
Entirety has sailed out of scanning area 104 (should now stop scanning).On the other hand, if light curtain is triggered, optoelectronic switch does not have
It is triggered, the type for showing vehicle is small-sized passenger vehicle (headstock is highly less than 2 meters), shows that the whole vehicle need to be with low dosage
Rate ray scanning (needs not distinguish between headstock and cargo hold, it is not necessary to change scan pattern), light curtain revert to show when not triggering it is whole
Car has sailed out of and (should stop scanning).
In certain embodiments, all goods carrying vehicles of type of all vehicles to be checked, for example, in early stage to vehicle to be checked
Shunted, only allow goods carrying vehicle to receive above-mentioned radiation scanning inspection.Now, above-mentioned detection unit 108 can not possess
1. individual function.
Preferably, the function of detection unit 108 can also be realized by vision sensor, and vision sensor can detect
By the type of the vehicle of scanning area 104, whether the low-dose scanning part detected in vehicle has been moved off scanning area
104, whether detection vehicle has been moved off scanning area 104, and control module 103 controls going out for radiographic source 101 according to these information
Beam pattern.
In addition, detection unit 106 can be arranged in the upstream lateral boundaries in neighbor scanning region 104, for detecting car
Whether will enter scanning area 104.During work, if detection unit 106 is triggered, show that vehicle will enter scanning area
Domain 104, it should immediately begin to low dose rate Mode scans.The benefit for setting detection unit 106 is more accurately to detect
At the time of entering scanning area 104 to vehicle.Preferably, detection unit 106 uses light curtain.
The trigger signal of above-mentioned all detection units is all sent to control module 103 in real time, and control module 103 is not according to
The working condition of same trigger signal control radiation source 101.
The radiation scanning flow of the embodiment of the present invention is described below.Fig. 5 is shown vehicle V1 in Fig. 3 sense channel
The schematic diagram passed through with vehicle V2.V1 and V2 is goods carrying vehicle in Fig. 5 embodiments, and two cars drive into successively from left side, V1
Preceding, V2 continues through sense channel rear.
Vehicle V1 first drives into sense channel, successively detection trigger unit 105 and 106, wherein 106 when being triggered, controls mould
Block 103 controls radiation source 101 to begin to send out low dose rate ray according to this trigger signal, the V1 cars to entering scanning area 104
Head implements scanning；The detection trigger unit 108 when V1 headstocks roll scanning area 104 away from, control module 103 is according to this trigger signal
Control radiation source 101 to enter high dose rate pattern, send high dose rate ray and the V1 cargo holds for entering scanning area 104 are implemented to sweep
Retouch；During radiation source 101 is in high dose rate pattern, V2 drives into sense channel, and detection trigger unit 105 (such as Fig. 5), says
Bright V2 has been driven at secure border, and now control module 103 controls radiation source 101 to immediately enter low dose according to this trigger signal
Dose rate pattern, before detecting that V2 headstocks roll scanning area 104 away from, radiation source 101 is made to continue to send with low dose rate pattern
Ray, it is ensured that the dosage that rear car occupant receives eliminates the risk that V2 headstocks are swept by mistake below safety limit.That is,
After V2 detection triggers unit 105, radiation source 101, which is converted to, sends low dose rate ray, then for not yet sailing out of scanning area
104 part V1 cargo holds are low dose rate ray scanning, detect that V1 integrally leaves scanning area completely in detection unit 108
When 104 (such as Fig. 6), the not break-off of radiation source 101, but maintain to send low dose rate ray, until detection unit 108 is examined
Measure V2 headstocks and rolled scanning area 104 (at this moment detection unit 108 also detects that V2 is lorry) away from, control module 103 controls
Radiation source 101 is again converted to high dose rate pattern (such as Fig. 7), and high dose rate ray scanning is done with the cargo hold to V2；Then, exist
When detection unit 108 detects that V2 has left scanning area 104 completely, control module 103 makes radiation source 101 stop sending penetrating
Line.Certainly, if V2 not yet leaves scanning area 104, radiation source 101 also in during high dose rate pattern completely, there is car again
V3 drives into sense channel and triggers detection unit 105, similarly, radiation source 101 can be made to immediately enter low dose rate pattern, held
The above-mentioned similar flow of row.
The key of above control flow is when rear car V2 reaches the detection unit 105 of secure border, by radiation source 101
High dose rate pattern switching is low dose rate pattern, it is ensured that the dosage that rear car occupant receives will not occur below safety limit
High dose rate ray sweeps the situation of driver's cabin by mistake.
In addition, if when rear car V2 reaches the detection unit 105 of secure border, radiation source 101 is not in high dose rate
Pattern, then it need not change the working condition of radiation source 101.Find that front truck V1 is small-sized for example, being detected by detection unit 108
Passenger carrying vehicle (bodywork height is less than H), then control unit 103 be not notified that radiation source 101 is converted to high dose rate pattern, but
Vehicle scanning is carried out to front truck V1 small-sized passenger carrying vehicle with low dose rate pattern, therefore in the absence of the agent that rear car V2 occupant receives
Amount exceedes safety limit situation possibility.
Alternatively, in order to shorten the total time that radiation source 101 goes out beam, the dosage that automotive occupant receives is reduced, for Fig. 5 realities
Example is applied, during radiation source 101 is in high dose rate pattern, after V2 drives into sense channel detection trigger unit 105, but still
Before non-detection trigger unit 106, if detection unit 108 detects that front truck V1 integrally leaves scanning area 104 completely, control
Molding block 103 makes radiation source 101 stop sending ray, and when V2 detection trigger units 106, control module 103 just makes radiation
Source 101 sends low dose rate ray, starts the scanning to V2.This scanning process shortens the total time that radiation source 101 goes out beam,
And the dose of radiation that automotive occupant receives is reduced, and the V1 and V2 scanography to continuing through are not influenceed.
Fig. 8 is the radiation scanning system side view of another embodiment of the present invention.Detection unit is added relative to Fig. 4, Fig. 8
107, the downstream lateral boundaries in its neighbor scanning region 104, integrally scanning area 104 whether is sailed out of for detecting vehicle.Work
When making, if detection unit 107 returns to non-triggering state from triggering state, show that the tailstock has sailed out of detection unit 107,
I.e. vehicle has integrally sailed out of scanning area 104.
Notice that the effect of the effect of detection unit 107 and the possessed of detection unit 108 3. individual function is identical, therefore
In scanning process, control module 103 can obtain vehicle according to the triggering state of detection unit 107 and sail out of scanning area 104
Information, the of detection unit 108 the 3. individual function is replaced with this.
Downstream lateral boundaries due to detection unit 107 than detection unit 108 closer to scanning area 104, once therefore car
Sail out of, detection unit 107 can detect in the very first time, report control module 103 in time, make radiation source 101 stop
Scanning, therefore setting detection unit 107 can shorten the sweep time of radiation source 101 on the whole.
Fig. 9 is the radiation scanning system side view of further embodiment of this invention.Detection unit is added relative to Fig. 4, Fig. 9
109, it is located in scanning area 104, and whether the headstock for detecting vehicle has sailed out of scanning area 104.
Notice that the effect of the effect of detection unit 109 and the possessed of detection unit 108 2. individual function is identical.But
It is that both working mechanisms are different, between detection unit 109 is by identifying between the headstock of vehicle and cargo hold (such as container)
Gap, judges whether headstock has sailed out of scanning area 104.Specifically, during work, will be touched after headstock enters scanning area 104
Detection unit 109 is sent out, within a period before vehicle integrally sails out of, is not triggered if detection unit 109 returns to, table
Sweep object corresponding to the bright period is the gap between headstock and cargo hold, then enters scanning area after that period of time
104 be vehicle cargo hold.That is, the change of the triggering state of detection unit 109 is reflected between headstock and cargo hold
Gap, in scanning process, control module 103 identifies the gap according to the trigger signal of detection unit 109, passes through in the gap
Afterwards, make radiation source 101 be converted to high dose rate Mode scans cargo hold, the of detection unit 108 the 2. individual function is replaced with this.Have
A little vehicles are between headstock and cargo hold and gap is not present, and whether 109 will be unable to detect headstock by scanning area, this feelings
Under condition, when 108 are triggered, then it represents that headstock is by scanning area, and control module 103 is by according to detection unit 108
Trigger signal, radiation source 101 is made to be converted to high dose rate Mode scans cargo hold.
Preferably, detection unit 109 is arranged in scanning area 104 and close to the downstream boundary of scanning area 104.
Detection unit 109 can use Measuring light screen.
The benefit for setting detection unit 109 is that, once headstock leaves scanning area 104, detection unit 109 can be first
Time detecting arrives, and reports control module 103 in time, makes radiation source 101 be converted to high dose rate Mode scans, can avoid to goods
The missing inspection in cabin, the suspicion quality testing output capacity of equipment is improved to greatest extent.
It is appreciated that in possessing the preferred embodiment of detection unit 107 and detection unit 109 at the same time, can only retain
Optoelectronic switch in detection unit 108, for detecting the type of vehicle, while cancel the light curtain in detection unit 108.
In actual job, exist different types of vehicle bicycle by or more cars continue through the feelings of sense channel
Condition, multiple-working mode pointedly can be set to the radiation scanning system of the present invention, each mode of operation is all based on the above and retouched
The flow for the embodiment of the present invention stated, is only illustrated herein.With reference to figure 10, wherein containing largely settable system work
Operation mode.
A) small-sized passenger carrying vehicle
State transfer according to：S0->S1->S0.
B) goods carrying vehicle
State transfer according to：S0->S1->S2->S0.
C) small-sized passenger carrying vehicle closelys follow goods carrying vehicle
State transfer according to：S0->S1->S2->S3->S5->S6->S0.
D) small-sized passenger carrying vehicle closelys follow small-sized passenger carrying vehicle
State transfer according to：S0->S1->S7->S1->S0.
E) goods carrying vehicle closelys follow small-sized passenger carrying vehicle
State transfer according to：S0->S1->S7->S1->S2->S0.
F) goods carrying vehicle closelys follow goods carrying vehicle
State transfer according to：S0->S1->S2->S3->S5->S6->S2->S0.
G) it is continuous to pass through n small-sized passenger carrying vehicle immediately following front truck
Front truck is goods carrying vehicle, state transfer according to：S0->S1->S2->S3->(S5->S6)n->S0。
Front truck is small-sized passenger carrying vehicle, state transfer according to：S0->S1->(S7->S1)n->S0.
H) it is continuous to pass through n goods carrying vehicle immediately following front truck
Front truck is goods carrying vehicle, state transfer according to：S0->S1->S2->(S3->S5->S6->S2)n->S0。
Front truck is small-sized passenger carrying vehicle, state transfer according to：S0->S1->S7->S1->S2->(S3->S5->S6->
S2)n-1->S0.Wherein,
State S0：Inspection system is ready, and radiographic source 101 stops sending ray.
State S1：Radiographic source 101 sends low dose rate ray.
State S2：Radiographic source 101 sends high dose rate ray.
State S3：Radiographic source 101 is switched into low dose rate pattern, sends low dose rate ray.
State S4：Radiographic source 101 stops sending ray.
State S5：Radiographic source 101 continues to send low dose rate ray.
State S6：Radiographic source 101 continues to send low dose rate ray.
State S7：Radiographic source 101 continues to send low dose rate ray.
Figure 11 provides another state transition diagram, with Figure 10's except that detection unit 108 detects in Figure 11 simultaneously
Vehicle has been moved off scanning area (the of detection unit 108 3. individual function).
In certain embodiments, radiographic source 101 can be accelerator radiographic source, such as electron linear accelerator, electronic induction
Accelerator (Betatron), runway microtron (RTM), accelerator for neutron production；Can also be radioactive source such as Co-60,
Cs-137 etc.；It can also be X-ray tube.
On the other hand, to ensure safety, the travel speed regulation minimum value of vehicle in sense channel is should be, such as can be set to
3km/h.After vehicle crosses secure border, to leave sense channel outlet before in a period of, if speed less than allow
Minimum speed 3km/h, system will suspend scanography work, and radiographic source 101 stops beam, sweep system halt work.
Preferably, one buffering area can be set in the downstream of scanning area 104, to monitor the shape of vehicle in buffering area
State.As shown in figure 12, using the part between scanning area 104 and sense channel outlet as traffic buffer, the buffering area
Length should be not less than the maximum length of tested vehicle, such as can be set to 20m.When speed of the vehicle in buffering area is less than 3km/h
When, system halt work is swept, radiographic source 101 stops beam.After the vehicle in buffering area all leaves, scanning system is extensive
Return to work work.Automatic switchover of the buffering area feasible system between working condition and halted state is set.Occur in road traffic
During congestion, without carrying out human intervention to system.
In some embodiments it is possible to the sensor 112 for information of vehicles identification is arranged in sense channel, such as car plate
Identification sensor and/or vehicle cab recognition sensor, it can recognize that the number-plate number and/or vehicle identification code VIN (Vehicle
Identification Number), characteristic information (such as the length and height of vehicle, headstock and cargo hold of vehicle can be reflected
The information such as degree), sensor 112 may be arranged as the sensor of recognizable container number.In Figure 12 embodiments, vehicle letter
Breath identification sensor 112 is arranged in porch.
In certain embodiments, the vehicle that control module 103 detects according to detection unit has been moved off scanning area 104
Signal, scanning of the notice system for the vehicle completed, subsequently carry out by be next vehicle scanning.In this company
During continuous scanning, it is possible to achieve the segmentation of scan image.For the 4 kinds of typical vehicles shown in Fig. 1, if 4 kinds of vehicles
The continuous radiation scanning system for passing sequentially through the present invention, the vehicle head part of goods carrying vehicle will be with low dose rate ray scanning, cargo hold
Part will will scan vehicle with high dose rate ray scanning, small-sized passenger carrying vehicle with low dose rate.On the one hand, system will produce 4
Width scan image, is followed successively by IMG1, IMG2, IMG3 and IMG4；On the other hand, each car may recognize that by Car license recognition sensor
License plate number, and container number identification sensor also may recognize that the container number of container carrier, then obtain LP1,
LP2、CN1、LP3、LP4、CN2、CN3；4 width scan images are bound with each identifier according to corresponding relation, such as Figure 13 institutes
Show, can obtain the comprehensive information of tested vehicle.
The empirical equation of X-ray radiation is produced according to electron bombardment metallic target：
Wherein, JxFor the dosage of X ray, i is average electron flux intensity (unit μ A), and V is beam energy (unit MV).
When V is 3MV, η takes 0.0271, n to take 3；When V is 8MV, η takes 0.0964, n to take 2.7.Distinguish for the strong i of identical electron stream, V
For 3MV and 8MV when, the latter's roentgen dose X rate is about the former 36.1 times.It can be seen that the stream for adjusting electron beam strong i or energy V,
The regulation to roentgen dose X rate can be achieved.Therefore, the electron stream of suitably adjustment radiographic source 101 is strong and/or emittance, can reach
Meet security legislation requirement in low dose rate status scan, energy is penetrated so that high radiation can be obtained during high dose rate status scan
Power.
In certain embodiments, the close rate of ray is realized by controlling the energy of radiographic source 101, low dose rate
During state, ray energy is less than 4MeV, and during high dose rate state, ray energy is higher than 3MeV.Radiographic source 101 is operated in low dosage
When rate state or high dose rate state, the ray sent can be single energy or dual intensity.Radiographic source 101 is in high agent
The time switched mutually between dose rate state and low dose rate state is not more than 20ms.
Radiographic source 101 can be Betatron, such as one kind of Russian Tomsk Polytechnics (TPU) production
7.5MeV Betaron.It export X-ray energy and close rate relation such as table 1 (when setting 7.5MeV output dose rate as
100%)：
| E,MeV | 7.5 | 6 | 5 | 4 | 3 | 2.5 | 2.0 |
| RD, % | 100 | 50 | 33 | 20 | 10 | 5 | 3 |
Table 1
In certain embodiments, the time that control module 103 can trigger according to different detection units, to calculate acquisition car
Leave speed during scanning area 104.Velocity radar or vision sensor can be arranged in sense channel exit, measure car
Leave speed during sense channel.According to these velocity informations and sensor states, control module 103, which may determine that, to be detected
Traffic congestion situation or vehicle trouble Parking situation, if there is analogue, control module whether occurs outside channel outlet
103 will control scanning system break-off.
Preferably, such as Figure 12, traffic lights 111 and automatic pin 110, control can be arranged in the porch of sense channel
When molding block 103 controls scanning system break-off, sense channel is closed automatically.
In certain embodiments, the time that control module 103 can trigger according to above-mentioned detection unit, to calculate acquisition car
Pass through speed during scanning area.Pass through speed during scanning area according to vehicle, setting pulsed radiographic source 101 is (as added
Fast device) pulse frequency or setting detector sample frequency/time (such as radioactive source, X-ray tube) or carry out velocity compensation, or with
The combination of upper technological means, to ensure that scan image is indeformable in vehicle traveling direction.In certain embodiments, can also use
Velocity radar or vision sensor etc. obtain real-time speed when vehicle passes through scanning area, when passing through scanning area according to vehicle
Real-time speed, can to scan image carry out vehicle traveling direction deformation correction.
In certain embodiments, detect that vehicle will enter scanning area from detection unit 106, enter to vehicle and scan
This period before region, inspection system will obtain image caused by low dose rate ray scanning, and radiographic source 101 is sent low
Close rate ray is not passed through tested vehicle, but after passing through sense channel, directly received by ray detector.These picture numbers
According to can be used for detector low dose rate response inconsistency be corrected.
Similarly, in certain embodiments, after vehicle leaves scanning area, detect vehicle to detection unit 107
Through leaving this period before scanning area, if radiographic source 101 sends ray with high dose rate all the time, inspection system will
Image caused by high dose rate ray scanning is obtained, the high dose rate ray that radiographic source 101 is sent is not passed through tested vehicle, and
It is through after sense channel, is directly received by ray detector.These view data can be used for ringing detector high dose rate
The inconsistency answered is corrected.
More than, technical scheme is described in detail in conjunction with specific embodiments, described specific implementation
Example is used to help understand the thought of the present invention.The derivation that those skilled in the art make on the basis of the specific embodiment of the invention
Fallen within modification within the scope of the present invention.
Claims (22)
1. a kind of continuous radiation scanning system, it includes：Radiation source, collimater, radiation detector and imaging device, its
It is characterised by, in addition to：First detection unit (105), the second detection unit (108) and control module；Wherein,
First detection unit (105) is used to detect whether rear object reaches precalculated position, and the precalculated position is positioned at scanning
The upstream in region and with the upstream lateral boundaries of scanning area at a distance of the first length L1；Wherein, the scanning area is sense channel
The middle region covered by radiation source ray；
Second detection unit (108) is used to detect needs the part with low dose rate ray scanning to have been moved off in preceding object
Scanning area and need that with the part of high dose rate ray scanning scanning area will be entered in preceding object；
Control module is used to receive the signal from each detection unit and radiation source is controlled according to signal；Wherein, when
When rear object reaches the precalculated position and radiation source is scanned with high dose rate ray, control module control spoke
The source of penetrating is converted to be scanned with low dose rate ray.
2. continuous radiation scanning system as claimed in claim 1, it is characterised in that wherein described first length L1 is big
In equal to 1 meter.
3. continuous radiation scanning system as claimed in claim 2, it is characterised in that wherein described second detection unit
(108) positioned at the downstream of scanning area and with scanning area downstream lateral boundaries at a distance of the second length L2.
4. continuous radiation scanning system as claimed in claim 3, it is characterised in that wherein described second detection unit
(108) optoelectronic switch and light curtain are included, wherein, optoelectronic switch is located at ground level H, under light curtain is located at optoelectronic switch just
On square ground, the distance of optoelectronic switch and light curtain to scanning area downstream lateral boundaries is the second length L2.
5. continuous radiation scanning system as claimed in claim 4, it is characterised in that wherein described height H be more than etc.
In 2 meters, the second length L2 is more than or equal to 2.5 meters.
6. continuous radiation scanning system as claimed in claim 1, it is characterised in that the system further comprises
Three detection units (106), between the first detection unit and scanning area, and the upstream of the 3rd detection unit and scanning area
Lateral boundaries are neighbouring.
7. continuous radiation scanning system as claimed in claim 1, it is characterised in that the system further comprises
Four detection units (107), it is between scanning area and the second detection unit, and under the 4th detection unit and scanning area
It is neighbouring to swim lateral boundaries.
8. continuous radiation scanning system as claimed in claim 1, it is characterised in that the system further comprises
Five detection units (109), it is located inside scanning area, and the 5th detection unit is close to the downstream lateral boundaries of scanning area.
9. continuous radiation scanning system as claimed in claim 1, it is characterised in that the system further comprises
Six detection units (112), it is located between the entrance and exit of sense channel, when preceding or when rear object is vehicle,
Six detection units are used for the number-plate number, vehicle identification code VIN and/or the container number for identifying vehicle.
10. continuous radiation scanning system as claimed in claim 1, it is characterised in that in entering for the sense channel
Velocity radar or vision sensor are installed between mouth and outlet.
11. continuous radiation scanning system as claimed in claim 1, it is characterised in that under the scanning area
Buffering area is provided between trip lateral boundaries and the outlet of sense channel, buffering area is the part sense channel that length is L3；When slow
When the car speed rushed in area is less than predetermined speed, the control module controls radiation scanning system break-off, closes detection
Passage, when not having vehicle in buffering area, the control module control radiation scanning system is resumed work, and reopens detection
Passage.
12. continuous radiation scanning system as claimed in claim 11, it is characterised in that the length of wherein described buffering area
Spend L3 and be more than or equal to 20 meters, the predetermined speed is 3km/h.
13. continuous radiation scanning system as claimed in claim 1, it is characterised in that in entering for the sense channel
Traffic lights and/or pin are installed at mouthful.
14. a kind of continuous radiation scanning methods, are swept with the ray that radiation source is sent to the vehicle in sense channel
Retouch, it is characterised in that methods described includes：
The first step, when detecting that the first vehicle will enter scanning area, it is scanned with low dose rate ray；
Second step, needed in the first vehicle after leaving scanning area with the part of low dose rate ray scanning, and need with
When the part of high dose rate ray scanning enters scanning area, be converted to and be scanned with high dose rate ray；
3rd step, after the first vehicle leaves scanning area completely, stop scanning；Wherein,
In the second step, during being scanned with high dose rate ray, if detecting the second car in sense channel
Predetermined secure border is had arrived at, then radiation source is controlled immediately, conversion will be scanned with high dose rate ray
To be scanned with low dose rate ray；
4th step, when detecting that the second vehicle enters scanning area, continue to be scanned with low dose rate ray；
5th step, using the second vehicle as the first new vehicle, it is transferred to second step；Wherein,
The secure border is located at the upstream of the scanning area, the secure border and the upstream lateral boundaries of the scanning area
The distance between be predetermined length L1.
15. continuous radiation scanning methods as claimed in claim 14, it is characterised in that the predetermined length L1 is more than
Equal to 1 meter.
16. continuous radiation scanning methods as claimed in claim 14, it is characterised in that after said first step and
Before the second step, methods described further comprises：The type of the first vehicle is detected, if the first vehicle is load-carrying vehicle
, it is transferred to second step；If the first vehicle is passenger carrying vehicle, the 3rd step is transferred to；And
After the 4th step and before the 5th step, methods described also includes：The type of the second vehicle is detected, if
Second vehicle is goods carrying vehicle, is transferred to the 5th step；If the second vehicle is passenger carrying vehicle, using the second vehicle as new first
Vehicle, it is transferred to the 3rd step.
17. continuous radiation scanning methods as claimed in claim 14, it is characterised in that wherein, it is described will be with height
Close rate ray is scanned be converted to and be scanned with low dose rate ray after, and detect that the second vehicle will described
Into before scanning area, methods described further comprises：Radiation source pause scanning, Zhi Daojian are controlled such that to radiation source
When scanning area will be entered by measuring the second vehicle, start to scan with low dose rate ray.
18. continuous radiation scanning methods as claimed in claim 14, it is characterised in that the car in sense channel
When being scanned, methods described further comprises：Identify the number-plate number, vehicle identification code VIN and/or the container case of vehicle
Number, and the scan image of vehicle is bound with the corresponding number-plate number, vehicle identification code VIN and/or container number.
19. continuous radiation scanning methods as claimed in claim 14, it is characterised in that the car in sense channel
When being scanned, methods described further comprises：The travel speed of vehicle in sense channel is obtained, when travel speed is less than
During 3km/h, control radiation source pause scanning, when travel speed is more than or equal to 3km/h, control radiation source recovers scanning.
20. continuous radiation scanning methods as claimed in claim 14, it is characterised in that the car in sense channel
When being scanned, methods described further comprises：One buffering area is set in scanning area downstream, when car in the buffering area
Travel speed when being less than 3km/h, control radiation scanning system break-off, sense channel closed, until the buffering area
When not having vehicle inside, control radiation scanning system is resumed work, and reopens sense channel；Wherein, the length of the buffering area
More than the maximum length for allowing the vehicle by the sense channel.
21. continuous radiation scanning methods as claimed in claim 14, it is characterised in that the car in sense channel
When being scanned, methods described further comprises：Pass through speed during scanning area according to vehicle, to the scan image of vehicle
Carry out the correction of vehicle traveling direction deformation.
22. continuous radiation scanning methods as claimed in claim 14, it is characterised in that the car in sense channel
When being scanned, methods described further comprises：The inconsistency responded to the low dose rate ray of radiation detector is carried out
Correction, the inconsistency responded to the high dose rate ray of radiation detector are corrected.
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| CN201410647357.9A CN104374785B (en) | 2014-11-14 | 2014-11-14 | A kind of continuous radiation scanning system and method |
| PCT/CN2015/072913 WO2016074365A1 (en) | 2014-11-14 | 2015-02-12 | Continuous pass-type radiation scanning system and method |
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