Content of the invention
The purpose of the present invention essentially consists in provides a kind of back-scatter radiation that can fast and effeciently arrange screening arrangement to becomeAs system.
According to an aspect of the invention, it is provided a kind of back-scatter radiation imaging system, including：Back scattering imaging fillsPut, for back-scatter radiation imaging is carried out to the examined object in detection zone；Shield, shield is to use radiation shield materialExpect the removable frame made, be suitable to be separately positioned on detection zone both sides with backlight scattering imaging device；And centering detectionDevice, including emission part and acceptance division, is separately positioned on shield and back scattering imaging device, wherein, is arranged on back scatteringEmission part on imaging device or acceptance division are located at back scattering imaging device and launch near the position of imaging ray bundle, emission part toPredetermined direction launches centering detection signal, wherein, when acceptance division receives centering detection signal or receives centering detection signalIntensity be more than predetermined strength threshold value when, scattering imaging device of supporting or opposing sends centering signal.
Preferably, emission part is arranged on back scattering imaging device, and predetermined direction is penetrated in the imaging of back scattering imaging deviceIn wire harness scanning plane；Or emission part is arranged on shield, predetermined direction is shield surface normal direction or and shieldThe angle in surface normal direction is less than 30 °.
Preferably, emission part be back scattering imaging device transmitting imaging ray bundle emitter, with emitter toAs centering detection signal, acceptance division is arranged on shield the centering beam of predetermined direction transmitting, for receiving centering inspectionSurvey signal, when the centering detection signal intensity that acceptance division receives is more than predetermined strength threshold value, scattering imaging device of supporting or opposing is sent outGo out centering signal.
Preferably, the intensity of the centering beam of emitter transmitting is weaker than imaging ray bundle.
Preferably, emission part is optical signal transmitter, and acceptance division is optical signal sensor, when acceptance division receives centering inspectionWhen surveying signal, scattering imaging device of supporting or opposing sends centering signal.
Preferably, it is arranged on emission part on shield or acceptance division is located at the center of shield；And/or setPut the acceptance division on back scattering imaging device or emission part is arranged to receive or the imaging of transmitting back scattering imaging device is penetratedCentering detection signal in wire harness scanning plane.
Preferably, in response to centering signal it is allowed to back scattering imaging device launches imaging ray bundle.
Preferably, back-scatter radiation imaging system can also include：Object monitoring device, for monitoring examined object beNo entrance detection zone, in the case that object monitoring device monitors that examined object enters or will enter detection zone,Emission part launches centering detection signal.
Preferably, monitor that examined object enters detection zone and back scattering imaging device receives in object monitoring deviceWhen receiving centering signal, back scattering imaging device starts to launch imaging ray bundle.
Preferably, in back scattering imaging device transmitting imaging ray bundle so that back-scatter radiation imaging is carried out to examined objectDuring, when acceptance division receives centering detection signal, back scattering imaging device stops transmitting imaging ray bundle.
Preferably, centering detection means can include multiple emission parts or multiple acceptance division, when the transmitting of multiple emission partsIn the case that centering detection signal is all received, or multiple acceptance division all receives centering detection signal, just supports or opposes and be scattering intoAs device sends centering signal.
Preferably, back-scatter radiation imaging system can also include：Alarming device, in emission part transmitting centering detectionSignal, and when centering detection means does not send centering signal, send warning.
To sum up, the back-scatter radiation imaging system of the present invention, using the portable shield installed, is examined by centering simultaneouslySurvey device detect this shield whether correct and effective install (whether with faced by the imaging ray beam scanning of back scattering imaging deviceIn), greatly improve deployment speed during the fixing work of back-scatter radiation imaging system and radiogical safety.
Specific embodiment
It is more fully described the preferred embodiment of the disclosure below with reference to accompanying drawings.Although showing the disclosure in accompanying drawingPreferred embodiment, however, it is to be appreciated that may be realized in various forms the disclosure and the embodiment party that should not illustrated hereFormula is limited.On the contrary, these embodiments are provided so that the disclosure is more thorough and complete, and can be by the disclosureScope intactly conveys to those skilled in the art.
When back scattering imaging device carries out radiant image to examined object, if being not provided with shield, or shieldingBody is not aligned with back scattering imaging device, and the imaging ray bundle of back scattering imaging device transmitting all can be led to pass through thing to be detectedBody, so that the personnel of examined object opposite side are subject to excessive radiation.And, it is vehicle-mounted shifting in back scattering imaging deviceIt is often necessary to deployment place is converted according to task situation during dynamic formula back scattering imaging equipment, need continually to dismantle and screen is installedCover body.
For above-mentioned situation, the present invention proposes a kind of back-scatter radiation that can quickly and accurately install shield and becomesAs system.
The back-scatter radiation imaging system of the present invention mainly includes back scattering imaging device, shield and centering detection dressPut three parts.With reference to specific embodiment with regard to the structure of each several part in the back-scatter radiation imaging system of the present invention and workPrinciple is described in further details.
1st, back scattering imaging device
Referring to Fig. 1, in the present embodiment, back scattering imaging device 10 can be integrated on moveable equipment, for example, canTo be integrated on vehicle.Wherein, back scattering imaging device 10 can include radiation appliance and detection device.
Radiation appliance can be made up of radiation source 11, beam current modulation device 12.The radiation signal of radiation source 11 transmitting is in bundleUnder the modulating action of stream modulating device 12, can form in time and be continually changing the pencil beam of position.
Wherein, radiation source 11 can adopt the X-ray tube of 225kV, can be shielded using lead or tungsten material about, andAnd collimater can be set in radiation direction, collimater can about radiation source beam 11 radiation X-ray beam short transverse (withScanning direction is vertical) subtended angle and scanning direction (back scattering imaging device 10 is with respect to the direction of relative movement of examined object)On width.
Beam current modulation device 12 can be any can be formed needed for back scattering imaging along inspected object short transverseThe device of the beam spot of upper scanning, such as flywheel or have incident in pairs and outgoing spiral fluted rotating cylinder etc..
Beam current modulation device 12 away from radiation source 11 side can arrange one after collimater 13.Collimater 13 afterwardsCan be made up of shielding materials such as tungsten, lead or steel, rear collimater 13 has from the ray of beam current modulation device 12 outgoing in heightSlit on direction, the slit median plane of rear collimater 13 is common with the scanning plane of the beam from beam current modulation device 12 outgoingFace.
15 is the imaging ray for object is carried out with back scattering scanning being formed in the presence of beam current modulation device 12Bundle, this imaging ray bundle is form of a stroke or a combination of strokes imaging ray bundle, and it can be scanned along short transverse.
Detection device can be made up of two detectors 14 being located at radiation appliance both sides respectively.Here, can also arrangeMultiple detectors 14, and multiple detector can be symmetricly set on the both sides of radiation appliance it is also possible to according to real space feelingsThe asymmetric setting of condition.
Wherein, detector 14 can apply to detect any detector of the scattered signal of examined object scattering, excellentSelection of land can be made up of plastic scintillant, photomultiplier and corresponding signal transacting and transmission electronics circuit.
Region shown in 30 is sense channel (detection zone addressed above), and examined object can pass through this detectionPassage, during examined object passes through sense channel, back scattering imaging device 10 just can be to treating in detection zoneDetection object carries out back-scatter radiation imaging.
Specifically, can be that back scattering imaging device 10 is motionless, examined object with certain speed (can be at the uniform velocity,Can also be speed change) pass through sense channel 30, can be to passing through from the imaging ray bundle 15 of back scattering imaging device 10 outgoingExamined object is scanned in height, and the part that examined object is scanned will scatter a number of scattering and penetrateWire harness, wherein, the detector 14 that scattered ray bundle between 90 ° to 180 ° for the angle of scattering can be scattered on imaging device 10 detectsArrive, the intensity of the scattered ray receiving bundle can be converted into dispersion image by detector 14.Thus it is possible to complete to be checkedSurvey the back-scatter radiation imaging of object.
In addition, the known technology that the back scattering imaging device 10 of the present invention can also not addressed herein using other,If installation rate detection means is to realize the geometric correction under the conditions of different speeds.
2nd, shield
Shield 16 is the removable frame made with radiation shielding material, be arranged on sense channel 30 away from back scatteringThe side of imaging device 10.
Wherein, the type of the radiation signal that the shielding material of shield 16 can be radiated according to back scattering imaging device 10Chosen.For example, for X or γ emission types, it is possible to use tungsten, lead, steel and concrete etc. are as shielding material.
Specifically, for X-ray shield, price can be adopted relatively inexpensive but the preferable lead material of shield effectiveness, in order toSolve the problems, such as that lead material rigidity is weak, necessary Steel material skeleton can be aided with.In order in the premise ensureing radiation screening effectThe lower weight as far as possible reducing shield 16, the shield 16 mid portion width range more slightly wider than imaging ray bundle 15 width is permissibleAdopt thicker main shield body to shield imaging ray bundle 15, the secondary shield beyond this part can be used for shielding ratio imaging and penetratesThe much lower stray radiation of wire harness 15 intensity, so the thickness of secondary shield can greatly reduce.
That is, shield 16 can include the stronger main shield body of screening ability and the weaker secondary shielding of screening abilityBody.Wherein it is possible to using shield 16 zone line as main shield body, main shield body can be made with thicker shielding material,Region beyond shield 16 zone line can be used as secondary shield, and secondary shield can be made with relatively thin shielding material.
In addition, shield 16 can store and be fixed on back scattering imaging device 10, with back scattering imaging device 10 1Play transport, and known technology can be adopted to simplify dismounting and to be easy to mobile and fixing.
3rd, centering detection means
Centering detection means includes emission part and acceptance division.Here it is possible to emission part is arranged on back scattering imaging deviceIt is also possible to be arranged on acceptance division on back scattering imaging device 10 on 10.Emission part is being arranged on back scattering imaging device 10When upper, acceptance division is arranged on shield 16, and when being arranged on acceptance division on back scattering imaging device 10, emission part is arranged onOn shield 16.
Because centering is mainly by shield 16 centre position of shield 16 (preferably) and back scattering imaging deviceThe position of 10 transmitting imaging ray bundle is aligned.Therefore, it is arranged on the emission part on back scattering imaging device 10 or receptionPortion can be preferably located in back scattering imaging device 10 and launch near the position of imaging ray bundle, be arranged on sending out on shield 16Penetrate portion or acceptance division can also be preferably located in the center of shield 16.
Emission part can launch centering detection signal to predetermined direction.Wherein, emission part is being arranged on back scattering imagingWhen on device 10, emission part can be along the direction of propagation transmitting centering inspection of the imaging ray bundle of back scattering imaging device 10 transmittingSurvey signal, now, predetermined direction can be in the imaging ray beam scanning face of back scattering imaging device 10.Here, imaging rayBeam scanning face is exactly the propagation face of the imaging ray bundle (flying spot bundle) from back scattering imaging device 10 transmitting.By emission partWhen being arranged on shield 16, emission part can be along the direction transmitting centering detection letter of the ground plane perpendicular to shield 16Number, now, predetermined direction can be for shield 16 surface normal direction it is also possible to angle with shield 16 surface normal directionLess than 30 °.
As shown in Figure 2 and Figure 3, in the center of shield 16, an emission part 20 can be set it is also possible in shieldIt is symmetrical arranged two emission parts 20 along center line on 16.Emission part 20 can launch centering along shield 16 surface normal directionDetection signal it is also possible to the transmitting in a certain angle with method line optics, for example, can be launched in 30 ° of angles.
When acceptance division receive emission part transmitting centering signal (or receive centering signal intensity be more than predetermined thresholdValue) when it can be determined that shield 16 is aligned with back scattering imaging device 10, scattering imaging device 10 of now can supporting or opposingPenetrate centering signal.
Emission part in centering detection means and acceptance division can be a set of independent emitting-receiving systems it is also possible to by carrying on the backThe part-structure of scattering imaging device 10 participates in constituting.
As one embodiment of the present of invention, the emission part in centering detection means can be in back scattering imaging device 10Radiation appliance.Acceptance division in centering detection means can be made up of the reception device being arranged on shield 16.This receptionDevice can be a kind of radiation detector, when the intensity signal that detector detects is higher than setting value, judge shield16 with imaging ray bundle 15 centering, scattering imaging device 10 of supporting or opposing sends centering signal it is allowed to back scattering imaging device 10 is launchedImaging ray bundle；On the contrary, if the intensity signal that control device receives is less than setting value, shield 16 and imaging are judgedThe non-centering of beam 15, forbids back scattering imaging device 10 transmitting imaging ray bundle.Here, using back scattering imaging device 10In radiation appliance as emission part when, can using the emissive porwer centering beam weaker than imaging ray bundle as centering detect letterNumber.That is, the beam of back scattering imaging device 10 transmitting both can carry out radiant image use as to object to be detectedImaging ray bundle it is also possible to as centering detection centering beam.And, detecting used time, Ke Yiyou as centeringThe weaker beam of selection of land emissive porwer.
Wherein, centering signal here can be sent by reception device it is also possible to be sent by other unit modules.For example,One control device can also be set on being arranged on shield 16, control device can according to reception device receive signal LaiForm the centering signal of whether centering.
In the present embodiment, the radiation detector in centering detection means may be mounted at the centre bit of dynamic shield 16Put.Radiation detector can apply to the various known Detection Techniques that imaging ray Shu Jinhang is detected, the radiation of its outputStrength signal can be the digital quantity that analog quantity can also be after AD conversion.
As an alternative embodiment of the invention, the emission part of centering detection means can be using similar infrared transmitterEtc optical signal transmitter, the acceptance division of centering detection means can be corresponding optical signal receiver.
Wherein, when being arranged on optical signal transmitter on back scattering imaging device 10, need to ensure optical signal transmitterThe optical signal of transmitting is in the imaging ray beam scanning face of back scattering imaging device 10.Now, the back scattering shown in Fig. 1 is becomeFor device 10, optical signal transmitter can be preferably mounted in inlet side or its slit of rear collimater 13, and optical signal connectsReceive the center that device may be mounted at shield 16.
Only when optical signal transmitter transmitting centering detection signal (optical signal) back scattering imaging device 10 imagingWhen in beam scanning plane, centering detection signal could project from rear collimater 13 collimating slit (imaging ray bundle be also fromProject it is ensured that both are coplanar in this slit), be then possible to allow optical signal receiver to receive.Only when detectingWhen sensor receiving unit receives the infrared beam that transmitter unit sends, just can provide centering signal it is allowed to back scattering imagingDevice 10 launches imaging ray bundle.
Correspondingly, when being arranged on optical signal transmitter on shield 16, optical signal transmitter may be mounted at shieldingThe center of body 16, the position that optical signal receiver may be mounted at the transmitting imaging ray bundle of back scattering imaging device 10 is attachedClosely, for example, for the back scattering shown in for Fig. 1 becomes device 10, optical signal receiver can be preferably mounted in rear collimater 13Inlet side or its slit in.
4th, specific work process
Monitoring before 4.1 centering detections
Under fixing mode of operation, back scattering imaging device 10 carries out the process of back-scatter radiation imaging to examined objectIn, examined object is located between back scattering imaging device 10 and shield 16, and now, examined object can block middle detection dressThe signal putting 20 acceptance division receives.
Therefore, the back-scatter radiation imaging system of the present invention can also include object monitoring device, to be detected for monitoringWhether object enters detection zone, in the case that object monitoring device monitors that examined object enters detection zone, centeringEmission part transmitting centering detection signal in detection means.
As shown in figure 1, when sense channel 30 is unidirectional sense channel, detection zone can be to be with imaging ray bundle 15Benchmark, extends the region of preset distance to sense channel upstream.In this case, can arrange in the upstream of imaging ray bundle 15One object monitoring device.
In addition, when sense channel 30 is two-way sense channel, detection zone can be on the basis of imaging ray bundle 15Extend the region of preset distance to both sides.In this case, an object prison can be respectively provided with imaging ray bundle 15 both sidesSurvey device.
Thus, it is possible to monitor whether examined object enters detection zone by object monitoring device, monitor to be checkedSurvey object to enter during detection zone it is believed that next needing back scattering imaging device 10 to carry out back scattering to examined objectImaging, at this point it is possible to control the emission part transmitting centering detection signal of centering detection means, to complete shield 16 and back scatteringThe centering detection process of imaging device 10.
4.2 centering detections
After the operating position of back scattering imaging device 10 is fixing, shield 16 or back scattering imaging device can be moved10, the situation of the centering detection signal of emission part transmitting that acceptance division receives in moving process, can be observed, to judge to shieldCover whether body 16 is aligned with back scattering imaging device 10.
According to the concrete setting of centering detection means, the centering detection signal of emission part transmitting can be received in acceptance divisionWhen it is believed that shield 16 is aligned with back scattering imaging device 10.Alternatively, it is also possible to receive emission part transmitting in acceptance divisionCentering detection signal intensity be more than predetermined strength threshold value when it is believed that shield 16 is right with back scattering imaging device 10Accurate.
In addition, the emission part being arranged on shield 16 or acceptance division can be multiple, at this point it is possible to only when multiple transmittingsThe centering detection signal of portion's transmitting is all received, or in the case that multiple acceptance division all receives centering detection signal, just toBack scattering imaging device 10 sends centering signal.Wherein, multiple emission parts or multiple acceptance division can keep at a certain distance away setting.
4.3 back-scatter radiation imagings
In response to receiving centering signal, back scattering imaging device 10 transmitting imaging ray bundle can be allowed.In back scatteringImaging device 10 carries out in back-scatter radiation imaging process to examined object, and the emission part in centering detection means can stopTransmitting centering signal is it is also possible to continue transmitting centering signal.
In the case that the emission part in centering detection means continues transmitting centering signal, if in centering detection meansAcceptance division receives centering signal, shows do not have examined object between shield 16 and back scattering imaging device 10, that is, completesScanning to examined object.Now, back scattering imaging device 10 can stop launching imaging ray bundle.
In addition, the back-scatter radiation imaging system of the present invention can also include alarming device.When centering detects unsuccessfully, alertShowing device can send warning, to remind related security staff.For example, it is possible to the emission part in centering detection means sends centeringDetection signal, and when centering detection means does not send centering signal, send warning.
To sum up, the back-scatter radiation imaging system of the present invention, using the portable shield installed, is examined by centering simultaneouslySurvey device detect this shield whether correct and effective install (whether with faced by the imaging ray beam scanning of back scattering imaging deviceIn), greatly improve deployment speed during the fixing work of back-scatter radiation imaging system and radiogical safety.
Above describe the back-scatter radiation imaging system according to the present invention in detail by reference to accompanying drawing.
It is described above various embodiments of the present invention, described above is exemplary, and non-exclusive, andIt is not limited to disclosed each embodiment.In the case of the scope and spirit without departing from illustrated each embodiment, for this skillFor the those of ordinary skill in art field, many modifications and changes will be apparent from.The selection of term used herein, purportBest explaining principle, practical application or the improvement to the technology in market of each embodiment, or make the artOther those of ordinary skill are understood that each embodiment disclosed herein.