CN104374785A - Continuous pass-type radiation scanning system and method - Google Patents
Continuous pass-type radiation scanning system and method Download PDFInfo
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Abstract
The invention discloses a continuous pass-type radiation scanning system. The system comprises a radiation source, a collimator, a radiation detector, an imaging device, a first detection unit (105), a second detection unit (108) and a control module; the first detection (105) is used for detecting whether a target object achieves a preset position which is located at the upstream of a scanning region and apart from the upstream side border of the scanning region by a first length L1, wherein the scanning region is a region covered with radiation source rays in a detection channel; the second detection unit (108) is used for detecting whether a part required to be subjected to the scanning of low-dosage rate rays in the target object leaves a scanning region and a part required to be subjected to the canning of high-dosage rate rays in the target object is about to enter the scanning region; and the control module is used for receiving signals from various detection units and controlling the radiation source according to the signals. The system and the method disclosed by the invention can be used for achieving the condition that a large quantity of to-be-detected vehicles can continuously and fast pass through the detection channel to finish the radiation scanning examination.
Description
Technical field
The present invention relates to radiography field, particularly moving target is carried out to the field of Rapid radiating imaging, be specifically related to a kind of continuous radiation scanning system and method.
Background technology
Ray is utilized to carry out to vehicle, goods etc. the conventional means that scanography is current border control and customs inspection.Along with increasingly serious anti-terrorism situation and the needs of cracking down on smuggling, need to carry out radiation scanning inspection to all vehicles of clearance.When clearance vehicle fleet size is numerous, in order to improve checking efficiency, be necessary to implement Rapid radiating imaging to moving vehicle, scanning is completed within the enough short time, like this, vehicle to be checked can accept scanography when not stopping, and safety check efficiency is high.In this scanography technology rapidly, continuously, a sixty-four dollar question need be dodged the region at occupant place in vehicle, prevent radiation injury, to the restriction that the roentgen dose X rate of occupant region must not specify higher than coherent radiation safety standard, as the dosage safety limit value that ANSI N43.17, IEC62463 require.At present, the equipment that can realize this Rapid radiating scanning safety check mainly contains two types.
The first does not distinguish occupant region in vehicle (pilothouse as headstock) and goods region (aft cargo compartment as high capacity waggon), uses LDR ray scanning to vehicle whole process to be checked.The advantage of this scheme scans with single LDR ray, and the steering logic of system is simple, and input cost is low.But because whole process uses indiscriminate LDR ray scanning, the penetration capacity of ray is not high, contrast resolution low, comparatively large to radiant image quality influence, limit the suspicion quality testing output capacity of this kind equipment.
The second distinguishes automotive occupant region and goods region, to occupant region in vehicle to be checked with LDR ray scanning, to goods region with high dose rate ray scanning.Namely first send LDR ray scanning headstock (pilothouse), after send high dose rate ray scanning cargo hold.The advantage of this scheme is under the prerequisite guaranteeing personal security, improves the suspicion quality testing output capacity of equipment.But, this radiation scanning rays safety detection apparatus must use jointly with other auxiliary equipment, such as must arrange the indicating device such as traffic lights and/or pin in the porch of sense channel to control scanning process, in Current vehicle scanning process, subsequent vehicle keeps off outside sense channel by indicating device, after front truck inspection terminates, reboot rear car and enter sense channel.If do not arrange this kind of indicating device, rear car is likely strayed into sense channel, the dosage causing rear car occupant to accept exceedes safety limit, the danger that the headstock that even there is rear car is swept by the high dose rate ray just in outgoing by mistake, some safety check place even needs to arrange special messenger aid in guide for this reason, plant maintenance and human cost high.
Summary of the invention
In view of this, the present invention proposes a kind of continuous radiation scanning system and method, by arranging secure border at scanning area upstream side, car state before and after monitoring, control the mode of operation of radiation source, the generation of by mistake sweeping can be stopped, guarantee that the acceptable dose of automotive occupant is below safety limit.
The invention provides a kind of continuous radiation scanning system, it comprises: radiation source, collimating apparatus, radiation detector and imaging device, it is characterized in that, also comprise: the first detecting unit (105), the second detecting unit (108) and control module; Wherein, whether the first detecting unit (105) arrives precalculated position for detecting object, described precalculated position be positioned at scanning area upstream and with the upstream side border of scanning area at a distance of the first length L1; Wherein, described scanning area is by region that radiation source ray covers in sense channel; Second detecting unit (108) needs to have left scanning area with the part of LDR ray scanning for detecting in object and needs in object to be about to enter scanning area with the part of high dose rate ray scanning; Control module is for the signal that receives from each detecting unit and control radiation source according to signal; Wherein, when object arrives described precalculated position and radiation source scans with high dose rate ray, described control module control radiation source is converted to and scans with LDR ray.
Preferably, wherein the first length L1 is more than or equal to 1 meter.
Preferably, wherein the second detecting unit (108) be positioned at scanning area downstream and with border, scanning area downstream at a distance of the second length L2.
Preferably, wherein the second detecting unit (108) comprises optoelectronic switch and light curtain, and wherein, optoelectronic switch is positioned at distance floor level H place, light curtain is positioned at immediately below optoelectronic switch on ground, and optoelectronic switch and light curtain are the second length L2 to the distance on border, scanning area downstream.
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, this system comprises the 3rd detecting unit (106) further, between the first detecting unit and scanning area, and the upstream side Boundary Nearest of the 3rd detecting unit and scanning area.
Preferably, this system comprises the 4th detecting unit (107) further, and it is between scanning area and the second detecting unit, and the downstream Boundary Nearest of the 4th detecting unit and scanning area.
Preferably, this system comprises the 5th detecting unit (109) further, and it is positioned at scanning area inside, and the 5th detecting unit is near the border, downstream of scanning area.
Preferably, this system comprises the 6th detecting unit (112) further, it is between the entrance and exit of sense channel, and when object is vehicle, the 6th detecting unit is for identifying the number-plate number of vehicle, vehicle identification code VIN and/or container number.
Preferably, between the entrance and exit of sense channel, velocity radar or vision sensor are installed.
Preferably, between the border, downstream and the outlet of sense channel of scanning area, be provided with buffer zone, the part sense channel of to be length be in buffer zone L3; When the car speed in buffer zone is less than predetermined speed, control module controls radiation scanning system break-off, closes sense channel, until when not having vehicle in buffer zone, control module controls radiation scanning system and resumes work, and reopens sense channel.
Preferably, the length L3 of buffer zone is more than or equal to 20 meters, and predetermined speed is 3km/h.
Preferably, in the porch of sense channel, traffic lights and/or pin are installed.
The present invention also provides a kind of continuous radiation scanning methods, the ray sent with radiation source scans the vehicle in sense channel, the method comprises: the first step, when detecting that the first vehicle is about to enter scanning area, scans with LDR ray; Second step, after needing to leave scanning area with the part of LDR ray scanning, and when needing to enter scanning area with the part of high dose rate ray scanning, is converted to and scans with high dose rate ray in the first vehicle; 3rd step, after the first vehicle leaves scanning area completely, stops scanning; Wherein, in second step, carrying out scan period with high dose rate ray, if detect that the second vehicle in sense channel has arrived predetermined secure border, then immediately radiation source is controlled, scan transformation will be carried out for scan with LDR ray with high dose rate ray; 4th step, when detecting that the second vehicle enters scanning area, continues to scan with LDR ray; 5th step, using the second vehicle as the first new vehicle, proceeds to second step; Wherein, secure border is positioned at the upstream of scanning area, and the distance between the upstream side border of secure border and scanning area is predetermined length L1.
Beneficial effect of the present invention: the present invention can do LDR ray scanning to the driving cabin of goods carrying vehicle, high dose rate ray scanning is done to cargo hold, to passenger carrying vehicle then car load do LDR ray scanning, under the prerequisite guaranteeing driver and crew's safety, there is higher suspicion quality testing output capacity; The more important thing is, the present invention is that the situation that many cars enter sense channel is continuously provided with secure border, achieves the automatic switchover of scan pattern, can very stop to sweep by mistake, make a large amount of vehicle to be checked can continuously quickly through sense channel, complete radiation scanning inspection, detection efficiency be high.
Accompanying drawing explanation
Fig. 1 is the type of four kinds of typical vehicles.
Fig. 2 is a kind of vertical view of typical radiation scanning sense channel.
Fig. 3 is the vertical view of the continuous radiation scanning system of the embodiment of the present invention.
Fig. 4 is the side view of Fig. 3 embodiment.
Fig. 5-7 is the schematic diagram having vehicle V1 and vehicle V2 to continue through in Fig. 3 sense channel.
Fig. 8 and Fig. 9 is the radiation scanning system side view of the present invention's two embodiments.
Figure 10 and Figure 11 is system job state transition diagram of the present invention.
Figure 12 is the system vertical view being provided with buffer zone etc. of the embodiment of the present invention.
Figure 13 is the corresponding relation figure of embodiment of the present invention scan image and identifier.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical scheme of the present invention is described in detail.
Fig. 1 schematically illustrates several dissimilar vehicle, and such as (1) is common goods carrying vehicle, as container car, truck, and the not identifiable design of the gap between headstock and cargo hold.(2) be container-type goods carrying vehicle, the gap identifiable design between headstock and container.(3) for dragging the container-type goods carrying vehicle of two containers.(4) be small-sized passenger carrying vehicle, as car.To scan several vehicles shown in Fig. 1, principle of the present invention, the course of work and ins and outs are described.Applicable object of the present invention is not limited to the vehicle shown in Fig. 1, is also applicable to similar all vehicles.
Fig. 2 schematically illustrates a kind of vertical view of typical sense channel.Wherein, radiographic source 101 sends ray, and ray covers certain space after collimating apparatus outgoing in sense channel, and vehicle accepts ray scanning through this part space, and this part free token is scanning area 104.Radiation detector array 102 receives the ray through scanning area 104, for later stage imaging.Control module 103 controls the duty of radiographic source 101.Conventional collimating apparatus, imaging device and radiation fender wall etc. are eliminated in Fig. 2.
Fig. 3 is the radiation scanning system vertical view of the embodiment of the present invention, and Fig. 4 is the side view of Fig. 3 embodiment, eliminates radiographic source 101, radiation detector array 102 and control module 103 in Fig. 4.During work, vehicle to be checked sails into from the entrance of sense channel upstream side (being left side figure).
In this embodiment, multiple detecting unit 105,106 and 108 is furnished with in sense channel, each detecting unit can be photoelectric sensor, metal sensor, pressure transducer, vision sensor, or the combination of multiple sensors, such as ground induction coil and light curtain can be combined as a detecting unit.
Wherein, detecting unit 105 is positioned at the pre-position of scanning area 104 upstream side, and with the upstream side border specific range L1 apart of scanning area 104, detecting unit 105 position can be considered " secure border ".During work, if detecting unit 105 is triggered, show have vehicle to reach secure border, now, if radiographic source 101 sends ray with high dose rate pattern, then need to be converted into LDR pattern immediately, avoid this car to continue traveling and cause the vehicle head part at personnel place to accept high dose rate ray, thus guarantee that dosage that rear car occupant accepts is below safety limit, stops the generation of by mistake sweeping.
Meanwhile, detecting unit 105 also can be used for detect vehicle whether be about to enter scanning area.If detecting unit 105 is triggered, show that vehicle is about to cross secure border and enters scanning area 104.Due to the necessarily headstock entered at first, should start with LDR Mode scans when therefore detecting unit 105 is triggered.
Preferably, L1 is more than or equal to 1m, and detecting unit 105 can adopt light curtain.
Detecting unit 108 is positioned at the downstream of scanning area 104, and with border, the downstream specific range L2 apart of scanning area 104, and detection is highly H; Wherein, L2 is more than or equal to the length of most long vehicle head, and such as, in all types of vehicle, the headstock length of container carrier is 2.5 meters, and the headstock length of other vehicle is all less than this value, then L2 >=2.5 meter.Detect height H and can be set to 2 meters, headstock height is less than to the vehicle of 2 meters, as small-sized passenger vehicle, can not trigger detecting unit 108.
This detecting unit 108 is mainly used in execution three functions: 1. detect the type of vehicle, 2. detect in vehicle whether need sail out of scanning area 104 and 3. detect entire vehicle whether sailed out of scanning area 104 with the part of LDR ray scanning (headstock).In an embodiment of the present invention, detecting unit 108 is suitable for the combination adopting multiple sensors, and a kind of preferred array mode is optoelectronic switch and light curtain.Wherein, optoelectronic switch is arranged on distance ground H At The Height, for performing the 1. individual function; Light curtain is arranged on the ground immediately below this optoelectronic switch, for performing the 2. with the 3. individual function.During work, if optoelectronic switch is triggered, show that the type of vehicle is lorry (headstock height is greater than 2 meters), this time curtain also will inevitably be triggered, show that headstock has sailed out of scanning area 104, what enter scanning area 104 after this is the cargo hold (now should be converted to high dose rate Mode scans) of vehicle, when light curtain reverts to non-trigger state, show that the tailstock has sailed out of detecting unit 108, also namely entire vehicle has sailed out of scanning area 104 (now should stop scanning).On the other hand, if light curtain is triggered and optoelectronic switch is not triggered, show that the type of vehicle is small-sized passenger vehicle (headstock height is less than 2 meters), show that this whole vehicle need (not need to distinguish headstock and cargo hold with LDR ray scanning, do not need to change scan pattern), light curtain reverts to when not triggering and shows that car load sails out of (should stop scanning).
In certain embodiments, the type of all vehicles to be checked is all goods carrying vehicle, such as, shunts vehicle to be checked in early stage, only allows goods carrying vehicle to accept above-mentioned radiation scanning inspection.Now, above-mentioned detecting unit 108 can not possess the 1. individual function.
Preferably, the function of detecting unit 108 also can be realized by vision sensor, vision sensor can detect by the type of the vehicle of scanning area 104, whether the low-dose scanning part detected in vehicle has left scanning area 104, detect car load and whether left scanning area 104, control module 103 goes out bundle pattern according to these information control radiographic source 101.
In addition, detecting unit 106 can being arranged on the upstream side border in neighbor scanning region 104, whether being about to enter scanning area 104 for detecting vehicle.During work, if detecting unit 106 is triggered, shows that vehicle is about to enter scanning area 104, should start immediately with LDR Mode scans.The benefit arranging detecting unit 106 it is possible to detect that vehicle enters the moment of scanning area 104 more exactly.Preferably, detecting unit 106 adopts light curtain.
The trigger pip of above-mentioned all detecting units is all sent to control module 103 in real time, and control module 103 controls the duty of radiation source 101 according to different trigger pips.
The radiation scanning flow process of the embodiment of the present invention is below described.Fig. 5 shows the schematic diagram having vehicle V1 and vehicle V2 passing through in the sense channel of Fig. 3.In Fig. 5 embodiment, V1 and V2 is goods carrying vehicle, and two cars sail into successively from left side, and V1 is front, and V2, rear, continues through sense channel.
Vehicle V1 first sails sense channel into, successively trigger detecting unit 105 and 106, and wherein 106 when being triggered, and control module 103 controls radiation source 101 according to this trigger pip and starts to send LDR ray, implements scanning to the V1 headstock entering scanning area 104; The trigger detecting unit 108 when V1 headstock rolls scanning area 104 away from, control module 103 controls radiation source 101 according to this trigger pip and enters high dose rate pattern, sends high dose rate ray and implements scanning to the V1 cargo hold entering scanning area 104; During radiation source 101 is in high dose rate pattern, V2 sails sense channel into, and trigger detecting unit 105 (as Fig. 5), illustrate that V2 has driven to secure border place, now control module 103 controls radiation source 101 according to this trigger pip and enters LDR pattern immediately, before detecting that V2 headstock rolls scanning area 104 away from, radiation source 101 is made to continue to send ray with LDR pattern, guarantee that dosage that rear car occupant accepts is below safety limit, eliminates V2 headstock by the risk of sweeping by mistake.That is, after V2 trigger detecting unit 105, radiation source 101 is converted to and sends LDR ray, be then LDR ray scanning for the part V1 cargo hold not yet sailing out of scanning area 104, when detecting unit 108 detects that V1 entirety leaves scanning area 104 completely (as Fig. 6), radiation source 101 not break-off, but maintenance sends LDR ray, until detecting unit 108 detects that V2 headstock has rolled scanning area 104 (at this moment detecting unit 108 also detects that V2 is lorry) away from, control module 103 controls radiation source 101 and is again converted to high dose rate pattern (as Fig. 7), to do high dose rate ray scanning to the cargo hold of V2, then, when detecting unit 108 detects that V2 leaves scanning area 104 completely, control module 103 makes radiation source 101 stop sending ray.Certainly, if during V2 leaves scanning area 104 not yet completely, radiation source 101 is also in high dose rate pattern, have again vehicle V3 to sail sense channel into and trigger detecting unit 105, similarly, radiation source 101 can be made to enter LDR pattern immediately, perform above-mentioned similar flow process.
The key of above control flow is when rear car V2 arrives the detecting unit 105 of secure border, the high dose rate pattern of radiation source 101 is switched to LDR pattern, guarantee that dosage that rear car occupant accepts is below safety limit, and the situation that high dose rate ray sweeps pilothouse by mistake can not occur.
In addition, if when rear car V2 arrives the detecting unit 105 of secure border, radiation source 101 is not in high dose rate pattern, then do not need the duty changing radiation source 101.Such as, detected by detecting unit 108 and find that front truck V1 is small-sized passenger carrying vehicle (bodywork height is lower than H), then control module 103 can not notify that radiation source 101 is converted to high dose rate pattern, but carrying out car load scanning with the small-sized passenger carrying vehicle of LDR pattern to front truck V1, the dosage that therefore there is not rear car V2 occupant acceptance exceedes safety limit situation possibility.
Alternatively, the T.T. of bundle is gone out in order to shorten radiation source 101, reduce the dosage that automotive occupant accepts, for Fig. 5 embodiment, during radiation source 101 is in high dose rate pattern, after V2 sails sense channel trigger detecting unit 105 into, but not yet before trigger detecting unit 106, if detecting unit 108 detects front truck V1, entirety leaves scanning area 104 completely, control module 103 makes radiation source 101 stop sending ray, until during V2 trigger detecting unit 106, control module 103 just makes radiation source 101 send LDR ray, starts the scanning to V2.This scanning process shortens the T.T. that radiation source 101 goes out bundle, and reduces the radiation dose of automotive occupant acceptance, and does not affect the scanography to V1 and V2 continued through.
Fig. 8 is the radiation scanning system side view of another embodiment of the present invention.Adding detecting unit 107 relative to Fig. 4, Fig. 8, the border, downstream in its neighbor scanning region 104, whether having sailed out of scanning area 104 for detecting entire vehicle.During work, if detecting unit 107 returns to non-trigger state from trigger state, show that the tailstock has sailed out of detecting unit 107, also namely entire vehicle has sailed out of scanning area 104.
The effect of the notice that the effect of detecting unit 107 and detecting unit 108 possess 3. individual function is identical, therefore in scanning process, control module 103 can obtain according to the trigger state of detecting unit 107 information that vehicle sail out of scanning area 104, replaces the 3. individual function of detecting unit 108 with this.
Because detecting unit 107 is than the downstream border of detecting unit 108 closer to scanning area 104, therefore once vehicle sails out of, detecting unit 107 can detect in the very first time, report control module 103 in time, make radiation source 101 stop scanning, therefore the sweep time that detecting unit 107 can shorten radiation source 101 is on the whole set.
Fig. 9 is the radiation scanning system side view of further embodiment of this invention.Add detecting unit 109 relative to Fig. 4, Fig. 9, it is positioned at scanning area 104, whether has sailed out of scanning area 104 for the headstock detecting vehicle.
The effect of the notice that the effect of detecting unit 109 and detecting unit 108 possess 2. individual function is identical.But both working mechanisms are different, and detecting unit 109, by identifying the gap between the headstock of vehicle and cargo hold (as container), judges whether headstock has sailed out of scanning area 104.Particularly, during work, by trigger detecting unit 109 after headstock enters scanning area 104, in the time period before entire vehicle sails out of, if detecting unit 109 returns to do not trigger, the sweep object showing corresponding to this time period is the gap between headstock and cargo hold, then what enter scanning area 104 after that period of time is the cargo hold of vehicle.That is, the change of the trigger state of detecting unit 109 reflects the gap between headstock and cargo hold, in scanning process, control module 103 is according to this gap of trigger pip identification of detecting unit 109, in this gap by afterwards, make radiation source 101 be converted to high dose rate Mode scans cargo hold, replace the 2. individual function of detecting unit 108 with this.Gap is there is not in some vehicle between headstock and cargo hold, whether 109 cannot detect headstock passes through scanning area, in this case, when 108 are triggered, then represent that headstock passes through scanning area, control module 103, by the trigger pip according to detecting unit 108, makes radiation source 101 be converted to high dose rate Mode scans cargo hold.
Preferably, detecting unit 109 is arranged in scanning area 104 and close scanning area 104 downstream boundary.Detecting unit 109 can adopt Measuring light screen.
The benefit arranging detecting unit 109 is, once headstock leaves scanning area 104, detecting unit 109 can detect in the very first time, report control module 103 in time, radiation source 101 is made to be converted to high dose rate Mode scans, that can avoid cargo hold is undetected, improves the suspicion quality testing output capacity of equipment to greatest extent.
Be appreciated that in the preferred embodiment possessing detecting unit 107 and detecting unit 109 at the same time, only can retain the optoelectronic switch in detecting unit 108, be used for detecting the type of vehicle, cancel the light curtain in detecting unit 108 simultaneously.
In actual job, exist dissimilar vehicle bicycle by or many cars continue through the situation of sense channel, pointedly multiple-working mode can be set to radiation scanning system of the present invention, each mode of operation is all the flow processs based on the embodiment of the present invention described above, only illustrates at this.With reference to Figure 10, wherein contain the system operating mode that major part can be arranged.
A) small-sized passenger carrying vehicle
State transfer is according to S0->S1->S0.
B) goods carrying vehicle
State transfer is according to S0->S1->S2->S0.
C) small-sized passenger carrying vehicle is immediately following goods carrying vehicle
State transfer is according to S0->S1->S2->S3->S5->S6->S0.
D) small-sized passenger carrying vehicle is immediately following small-sized passenger carrying vehicle
State transfer is according to S0->S1->S7->S1->S0.
E) goods carrying vehicle is immediately following small-sized passenger carrying vehicle
State transfer is according to S0->S1->S7->S1->S2->S0.
F) goods carrying vehicle is immediately following goods carrying vehicle
State transfer is according to S0->S1->S2->S3->S5->S6->S2-Gr eatT.GreaT.GTS0.
G) n small-sized passenger carrying vehicle is passed through immediately following front truck continuously
Front truck is goods carrying vehicle, and state transfer is according to S0->S1->S2->S3-> (S5->S6)
n->S0.
Front truck is small-sized passenger carrying vehicle, and state transfer is according to S0->S1-> (S7->S1) n->S0.
H) n goods carrying vehicle is passed through immediately following front truck continuously
Front truck is goods carrying vehicle, and state transfer is according to S0->S1->S2-> (S3->S5->S6->S2)
n->S0.
Front truck is small-sized passenger carrying vehicle, and state transfer is according to S0->S1->S7->S1->S2-> (S3->S5->S6->S2)
n-1->S0.Wherein,
State S0: check system is ready, radiographic source 101 stops sending ray.
State S1: radiographic source 101 sends LDR ray.
State S2: radiographic source 101 sends high dose rate ray.
State S3: radiographic source 101 is switched to LDR pattern, sends LDR ray.
State S4: radiographic source 101 stops sending ray.
State S5: radiographic source 101 continues to send LDR ray.
State S6: radiographic source 101 continues to send LDR ray.
State S7: radiographic source 101 continues to send LDR ray.
Figure 11 provides another state transition diagram, with the difference of Figure 10 is, in Figure 11, detecting unit 108 detects vehicle simultaneously and left scanning area (detecting unit 108 3. individual function).
In certain embodiments, radiographic source 101 can be accelerator radiographic source, as electron linear accelerator, and betatron (Betatron), runway microtron (RTM), neutron generator; Also can be that radioactive source is as Co-60, Cs-137 etc.; Also can be X-ray tube.
On the other hand, for guaranteeing safety, should be the travel speed regulation minimum value of vehicle in sense channel, such as, can be decided to be 3km/h.After secure border crossed by vehicle, to leave sense channel outlet before during in, if the speed of a motor vehicle lower than allow minimum speed 3km/h, system will suspend scanography work, and radiographic source 101 stops bundle, sweep system halt work.
Preferably, a buffer zone can be set in the downstream of scanning area 104, in order to monitor the state of vehicle in buffer zone.As shown in figure 12, using the part between scanning area 104 and sense channel export as traffic buffer, the length of this buffer zone should be not less than the maximum length of tested vehicle, such as, can be decided to be 20m.When the speed of vehicle in buffer zone is lower than 3km/h, sweep system halt work, radiographic source 101 stops bundle.Until the vehicle in buffer zone all leaves, scanning system is resumed work.The automatic switchover of buffer zone feasible system in working order and between halted state is set.When road traffic gets congestion, without the need to carrying out human intervention to system.
In certain embodiments, the sensor 112 being used for information of vehicles identification can be arranged in sense channel, as Car license recognition sensor and/or vehicle cab recognition sensor, the identifiable design number-plate number and/or vehicle identification code VIN (Vehicle Identification Number), can reflect the characteristic information (information such as the length of such as vehicle, headstock and cargo hold and height) of vehicle, sensor 112 can also be set to the sensor of identifiable design container number.In Figure 12 embodiment, information of vehicles identification sensor 112 is arranged in porch.
In certain embodiments, control module 103 has left the signal of scanning area 104 according to the vehicle that detecting unit detects, notice system completes for the scanning of this vehicle, and follow-up what carry out will be the scanning of next vehicle.In the process of this continuous sweep, the segmentation of scan image can be realized.For kind of the typical vehicle of 4 shown in Fig. 1, if 4 kinds of vehicles are continuously successively by radiation scanning system of the present invention, the vehicle head part of goods carrying vehicle will with LDR ray scanning, and cargo hold part will with high dose rate ray scanning, and small-sized passenger carrying vehicle will scan car load with LDR.On the one hand, system, by generation 4 width scan image, is followed successively by IMG1, IMG2, IMG3 and IMG4; On the other hand, gone out the license plate number of each car by Car license recognition sensor identifiable design, and container number identification sensor also identifiable design go out the container number of container carrier, so obtain LP1, LP2, CN1, LP3, LP4, CN2, CN3; 4 width scan images and each identifier are bound according to corresponding relation, as shown in figure 13, the comprehensive information of tested vehicle can be obtained.
The experimental formula of X-radiation is produced according to electronics bombardment metallic target:
Wherein, J
xfor the dosage of X ray, i is average electron flux intensity (unit μ A), V is beam energy (unit MV).When V is 3MV, η gets 0.0271, n and gets 3; When V is 8MV, η gets 0.0964, n and gets 2.7.When being respectively 3MV and 8MV for identical electron stream strong i, V, the latter's roentgen dose X rate is about the former 36.1 times.Visible, regulate the strong i of stream or the energy V of electron beam, all can realize the adjustment to ray dose rate.Therefore, suitably strong the and/or emittance of the electron stream of adjustment radiographic source 101, can reach and meet security legislation requirement when LDR status scan, can obtain high radiation penetration capacity during high dose rate status scan.
In certain embodiments, the dose rate of ray is realized by the energy of control radiographic source 101, and during LDR state, ray energy is lower than 4MeV, and during high dose rate state, ray energy is higher than 3MeV.When radiographic source 101 is operated in LDR state or high dose rate state, the ray sent can be monoenergetic, also can be dual intensity.The time that radiographic source 101 switches mutually between high dose rate state and LDR state is not more than 20ms.
Radiographic source 101 can be Betatron, a kind of 7.5MeV Betaron that such as Russian Tomsk Polytechnics (TPU) is produced.The relation of X-ray energy that its exports and dose rate is as table 1 (when setting 7.5MeV output dose rate as 100%):
| E,MeV | 7.5 | 6 | 5 | 4 | 3 | 2.5 | 2.0 |
| R D,％ | 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, the speed obtained when vehicle leaves scanning area 104 is calculated.Can arrange velocity radar or vision sensor in sense channel exit, measuring vehicle leaves speed during sense channel.According to these velocity informations and sensor states, control module 103 can judge, outside sense channel outlet, whether traffic congestion situation or vehicle trouble Parking situation occur, if there is analogue to occur, then gated sweep system halt works by control module 103.
Preferably, as Figure 12, traffic lights 111 and automatic pin 110 can be arranged in the porch of sense channel, during control module 103 gated sweep system halt work, automatically close sense channel.
In certain embodiments, the time that control module 103 can trigger according to above-mentioned detecting unit, calculate and obtain vehicle by speed during scanning area.According to vehicle by speed during scanning area, set pulsed frequency or setting detector sample frequency/time (as radioactive source, X-ray tube) of pulsed radiographic source 101 (as accelerator) or carry out velocity compensation, or more the combination of technological means, to ensure that scan image is indeformable at vehicle direct of travel.In certain embodiments, velocity radar or vision sensor etc. also can be used to obtain vehicle by real-time speed during scanning area, according to vehicle by real-time speed during scanning area, the correction of vehicle direct of travel distortion can be carried out to scan image.
In certain embodiments, detect that vehicle is about to enter scanning area from detecting unit 106, before entering scanning area to vehicle during this period of time, check system will obtain the image of LDR ray scanning generation, the LDR ray that radiographic source 101 sends is not through tested vehicle, and after being through sense channel, directly received by ray detector.These view data can be used for correcting the inconsistency of detector LDR response.
In like manner, in certain embodiments, after vehicle leaves scanning area, to detecting unit 107 detect vehicle left scanning area before during this period of time, if radiographic source 101 sends ray with high dose rate all the time, then check system will obtain the image of high dose rate ray scanning generation, and the high dose rate ray that radiographic source 101 sends is not through tested vehicle, and after being through sense channel, directly received by ray detector.These view data can be used for correcting the inconsistency of detector high dose rate response.
Above, be described in detail in conjunction with specific embodiments to technical scheme of the present invention, described specific embodiment understands thought of the present invention for helping.The derivation that those skilled in the art make on the basis of the specific embodiment of the invention and modification also belong within scope.
Claims (22)
1. a continuous radiation scanning system, it comprises: radiation source, collimating apparatus, radiation detector and imaging device, is characterized in that, also comprises: the first detecting unit (105), the second detecting unit (108) and control module; Wherein,
Whether the first detecting unit (105) arrives precalculated position for detecting object, described precalculated position be positioned at scanning area upstream and with the upstream side border of scanning area at a distance of the first length L1; Wherein, described scanning area is by region that radiation source ray covers in sense channel;
Second detecting unit (108) needs to have left scanning area with the part of LDR ray scanning for detecting in object and needs in object to be about to enter scanning area with the part of high dose rate ray scanning;
Control module is for the signal that receives from each detecting unit and control radiation source according to signal; Wherein, when object arrives described precalculated position and radiation source scans with high dose rate ray, control module control radiation source is converted to and scans with LDR ray.
2. continuous radiation scanning system as claimed in claim 1, it is characterized in that, wherein said first length L1 is more than or equal to 1 meter.
3. continuous radiation scanning system as claimed in claim 2, is characterized in that, wherein said second detecting unit (108) be positioned at scanning area downstream and with border, scanning area downstream at a distance of the second length L2.
4. continuous radiation scanning system as claimed in claim 1, it is characterized in that, wherein said second detecting unit (108) comprises optoelectronic switch and light curtain, wherein, optoelectronic switch is positioned at distance floor level H place, light curtain is positioned at immediately below optoelectronic switch on ground, and optoelectronic switch and light curtain are described second length L2 to the distance on border, scanning area downstream.
5. continuous radiation scanning system as claimed in claim 4, it is characterized in that, wherein said height H is more than or equal to 2 meters, and described second length L2 is more than or equal to 2.5 meters.
6. continuous radiation scanning system as claimed in claim 1, it is characterized in that, described system comprises the 3rd detecting unit (106) further, between the first detecting unit and scanning area, and the upstream side Boundary Nearest of the 3rd detecting unit and scanning area.
7. continuous radiation scanning system as claimed in claim 1, it is characterized in that, described system comprises the 4th detecting unit (107) further, and it is between scanning area and the second detecting unit, and the downstream Boundary Nearest of the 4th detecting unit and scanning area.
8. continuous radiation scanning system as claimed in claim 1, it is characterized in that, described system comprises the 5th detecting unit (109) further, and it is positioned at scanning area inside, and the 5th detecting unit is near the border, downstream of scanning area.
9. continuous radiation scanning system as claimed in claim 1, it is characterized in that, described system comprises the 6th detecting unit (112) further, it is between the entrance and exit of sense channel, when object is vehicle, the 6th detecting unit is for identifying the number-plate number of vehicle, vehicle identification code VIN and/or container number.
10. continuous radiation scanning system as claimed in claim 1, is characterized in that, between the entrance and exit of described sense channel, be provided with velocity radar or vision sensor.
11. continuous radiation scanning system as claimed in claim 1, is characterized in that, between the border, downstream and the outlet of sense channel of described scanning area, be provided with buffer zone, the part sense channel of to be length be in buffer zone L3; When the car speed in buffer zone is less than predetermined speed, described control module controls radiation scanning system break-off, closes sense channel, until when not having vehicle in buffer zone, described control module controls radiation scanning system and resumes work, and reopens sense channel.
12. continuous radiation scanning system as claimed in claim 11, it is characterized in that, the length L3 of wherein said buffer zone is more than or equal to 20 meters, and described predetermined speed is 3km/h.
13. continuous radiation scanning system as claimed in claim 1, is characterized in that, be provided with traffic lights and/or pin in the porch of described sense channel.
14. 1 kinds of continuous radiation scanning methods, the ray sent with radiation source scans the vehicle in sense channel, it is characterized in that, described method comprises:
The first step, when detecting that the first vehicle is about to enter scanning area, scans with LDR ray;
Second step, after needing to leave scanning area with the part of LDR ray scanning, and when needing to enter scanning area with the part of high dose rate ray scanning, is converted to and scans with high dose rate ray in the first vehicle;
3rd step, after the first vehicle leaves scanning area completely, stops scanning; Wherein,
In described second step, scan period is being carried out with high dose rate ray, if detect that the second vehicle in sense channel has arrived predetermined secure border, then immediately radiation source is controlled, scan transformation will be carried out for scan with LDR ray with high dose rate ray;
4th step, when detecting that the second vehicle enters scanning area, continues to scan with LDR ray;
5th step, using the second vehicle as the first new vehicle, proceeds to second step; Wherein,
Described secure border is positioned at the upstream of described scanning area, and the distance between the upstream side border of described secure border and described scanning area is predetermined length L1.
15. continuous radiation scanning methods as claimed in claim 14, it is characterized in that, described predetermined length L1 is more than or equal to 1 meter.
16. continuous radiation scanning methods as claimed in claim 14, it is characterized in that, after said first step and before described second step, described method comprises further: the type detecting the first vehicle, if the first vehicle is goods carrying vehicle, proceed to second step; If the first vehicle is passenger carrying vehicle, proceed to the 3rd step; And,
After described 4th step and before described 5th step, described method also comprises: the type detecting the second vehicle, if the second vehicle is goods carrying vehicle, proceed to the 5th step; If the second vehicle is passenger carrying vehicle, then using the second vehicle as the first new vehicle, proceed to the 3rd step.
17. continuous radiation scanning methods as claimed in claim 14, it is characterized in that, wherein, at the described scan transformation that will carry out with high dose rate ray for after scanning with LDR ray, and described detect that the second vehicle is about to enter scanning area before, described method comprises further: control to make radiation source suspend scanning to radiation source, until when detecting that the second vehicle is about to enter scanning area, start scanning with LDR ray.
18. continuous radiation scanning methods as claimed in claim 14, it is characterized in that, when scanning the vehicle in sense channel, described method comprises further: identify the number-plate number of vehicle, vehicle identification code VIN and/or container number, and bound with the corresponding number-plate number, vehicle identification code VIN and/or container number by the scan image of vehicle.
19. continuous radiation scanning methods as claimed in claim 14, it is characterized in that, when scanning the vehicle in sense channel, described method comprises further: the travel speed obtaining vehicle in sense channel, when travel speed is less than 3km/h, control radiation source and suspend scanning, when travel speed is more than or equal to 3km/h, controls radiation source and recover scanning.
20. continuous radiation scanning methods as claimed in claim 14, it is characterized in that, when scanning the vehicle in sense channel, described method comprises further: arrange a buffer zone in scanning area downstream, when the travel speed of vehicle is less than 3km/h in this buffer zone, controls radiation scanning system break-off, close sense channel, until when there is no vehicle in described buffer zone, control radiation scanning system and resume work, reopen sense channel; Wherein, the length of described buffer zone is greater than the maximum length allowed by the vehicle of described sense channel.
21. continuous radiation scanning methods as claimed in claim 14, it is characterized in that, when scanning the vehicle in sense channel, described method comprises further: according to vehicle by speed during scanning area, the scan image of vehicle is carried out to the correction of vehicle direct of travel distortion.
22. continuous radiation scanning methods as claimed in claim 14, it is characterized in that, when scanning the vehicle in sense channel, described method comprises further: correct the inconsistency that the LDR ray of radiation detector responds, and corrects the inconsistency that the high dose rate ray of radiation detector responds.
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