CN102901740A - Channel type four visual angles X ray liquid state article safety inspection system - Google Patents
Channel type four visual angles X ray liquid state article safety inspection system Download PDFInfo
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Abstract
The invention discloses a channel type four visual angles X ray liquid state article safety inspection system, which is composed of a system control and signal processing circuit unit, a first bench acquisition computer, a second bench acquisition computer, a third bench density computer, a switch, a conveyer, a transfer channel, four groups of X radiation source and four groups of detectors, and the first bench acquisition computer, the second bench acquisition computer and third bench density computer are connected through a local network. The safety inspection system has the following advantages that 1) the inspection capability is strong, the liquid dangerous products with different sizes and different materials can be effectively detected; 2) the inspection speed is fast, and six liquid can be simultaneously detected; and 3) the detection sensitivity is high and the detection is accurate. In addition, the safety inspection system has strong anti-interference capability, and is suitable for a safety check system in important places such as civil aviation, railway and customs.
Description
Technical field
The present invention relates to a kind of channel-type four visual angle X ray liquid article safety check systems.
Background technology
Since September 11 attacks, the liquid article inspection becomes the hot issue in safety inspection field gradually, particularly in security fields such as aviation, railway, highway, rallies, because it is of a great variety, diversified in packaging that liquid article relates to, so that it is increasing quickly and accurately all kinds of liquid articles to be carried out the difficulty of dangerous identification.
In existing liquid article safety inspection technology, lossless detection method based on X ray transmission imaging technology, it is high to possess simultaneously the check result accuracy with it, low to container material quality susceptibility, the characteristics such as simple operation, be subject to the attention of more and more safety check manufacturers, this wherein, representational is that patent publication No. is two pieces of patents of invention of CN101140247A and CN101629916A, their common ground is all based on the CT layer scanning technology, its method can be sketched and be: send the X ray transmission by radiographic source and be examined liquid article, utilize detector to accept the beam that liquid article is crossed in transmission, and form hundreds of multi-angle projection data, by these hundreds of multi-angle projection data are carried out inversion calculation, calculate the gamma ray absorption coefficient that is examined liquid article, wherein, patent CN101629916A is owing to utilized dual-energy x-ray, more can obtain simultaneously to be examined density and the material information of liquid article, at last, with liquid article absorption coefficient or liquid article density, material information is compared with default database, finishes the inspection to tested liquid article.This class is based on the liquid article safety detection method of CT layer scanning technology, its sharpest edges are to check that precision is high, because it has obtained hundreds of multi-angle projection data in checking process, the various backprojection reconstruction technology that recycling is relatively ripe can access desirable tomography cross-section data.But also there is obvious deficiency in this class CT layer scanning technology: 1) checking efficiency is on the low side, once usually can only check a conventional volume size liquid article, and a checking process is consuming time longer; 2) check that the object coverage rate is wideless, for the diameter that is examined liquid article, highly, volume has to a certain degree restriction, and can only check specially that liquid article can not compatiblely check parcel.These 2 deficiencies all will limit CT type liquid article safety detection method and equipment in the larger occasion of flow of the people, as: the application in the places such as airport, railway station, big assembly.
Therefore, for common liquid article safety inspection, be necessary research and develop a kind ofly can guarantee higher inspection precision, can realize again in batches, check fast, can also compatiblely carry channel-type X-ray liquid article examination method and the system that parcel checks to the passenger.
Multi-view X ray safety detection method and system that US Patent No. 6088423, US7020241 and Chinese patent CN101592622 relate to.Shine the source according to 1 side in source at the bottom of the system that US6088423 invents adopts 2, form three visual angle x-ray sources and detector layout type that 3 sources 3 are visited; The five visual angle mode of operations that the system that US7020241 invents has adopted 3 sources 5 to visit, and irradiation line source and 1 top irradiation line source at the bottom of the various visual angles layout adopts 2, each end irradiation line source is corresponding 2 groups of detectors respectively, and the top corresponding 1 group of detector of irradiation line source forms 5 visual angles; At the bottom of multi-view X ray safety check system that CN101592622 relates to adopts 2 according to source and 1 top according to the source, form the three visual angle mode of operations that 3 sources 3 are visited, adopted the real dual-energy visual angle layout of dijection line source double detector at the bottom of its 1 according to the visual angle.But above 3 kinds of multi-view X ray safe examination systems can not be surveyed by the liquid towards article all take parcel as detected object, and lower, the poor anti jamming capability of accuracy that checks, the place of its application and field are comparatively narrow.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of channel-type four visual angle X ray liquid article safety check systems, a kind of channel-type four visual angle X ray liquid article safety check systems of the present invention are by system's control and signal processing circuit unit, the First collecting computer, second collecting computer, the 3rd density calculation machine, capture card, switch, conveyor, transfer passage, four groups of x-ray sources and four groups of detectors form described First collecting computer, connect by LAN between described second collecting computer and the 3rd density calculation machine; Every group of x-ray source and detector are called a visual angle module, comprise altogether four visual angle modules, and described four visual angle modules comprise: the top, right side according to visual angle module, right side horizontal side according to visual angle module, right side at the bottom of according at the bottom of visual angle module and the middle part according to the visual angle module; The top, right side comprises that according to the visual angle module top, right side according to x-ray source and the first detector, consists of V1 visual angle module; The right side horizontal side comprises the right side horizontal side according to x-ray source and the second detector according to the visual angle module, consists of V2 visual angle module; Shine at the bottom of the right side and shine visual angle x-ray source and the 3rd detector at the bottom of the visual angle module comprises the right side, consist of V3 visual angle module; The end, middle part, comprise that according to the visual angle module end, middle part according to visual angle x-ray source and the 4th detector, consists of V4 visual angle module.The 3rd detector of the first detector of described V1 visual angle module, the second detector of V2 visual angle module, V3 visual angle module is the L-type detector, the 4th detector of V4 visual angle module is U-shaped detector, described V1 visual angle module, V2 visual angle module, V3 visual angle module, V4 visual angle module all is connected with a capture card by signal processing circuit unit.In liquid was surveyed, described V1 visual angle module, V3 visual angle module, V4 visual angle module were responsible for the Static Fault reconstruction that liquid is surveyed, and described V2 visual angle module is responsible for liquid level and is calculated, and can assist other visual angle cross sectional reconstructions.Therefore, interior two liquid cross-sectional of simultaneously Static Fault reconstruction of four visual angle topological design structures passage and calculating liquid level that the present invention is brand-new, so the present invention can survey a plurality of liquid simultaneously.
In described First collecting computer and second collecting computer image acquisition units, low atomic number vessel liquid materials detection unit, information communication unit have been installed all, described the 3rd density calculation machine installed images match unit, density detection unit, high atomic number vessel liquid materials detection unit, decision-making alarm unit, information communication unit;
1) described image acquisition units is installed in described First collecting computer and second collecting computer, wherein the First collecting computer connects the image pick-up card of described V1 visual angle module and described V2 visual angle module, reception is from the view data of described V1 visual angle module and described V2 visual angle module, second collecting computer connects the image pick-up card of described V3 visual angle module and described V4 visual angle module, receives the view data from described V3 visual angle module and described V4 visual angle module.
2) described low atomic number vessel liquid materials detection cellular installation is used for the zone that the image from described four visual angle modules that obtains is carried out image segmentation and orients liquid article in described First collecting computer and second collecting computer.Described First collecting computer is for the material data of the low atomic number liquid in container that calculates described V1 visual angle module and described V2 visual angle module, and same described second collecting computer is for the material data of the low atomic number liquid in container to be detected that calculates described V3 visual angle module and described V4 visual angle module.
3) described information communication unit is used for transmitting original image, result of calculation, control command and information between described First collecting computer and second collecting computer and the 3rd density calculation machine.
4) described images match cellular installation is in described the 3rd density calculation machine, to from the view data of described four visual angle modules and materials detection result through after the images match, confirm that the data of described four visual angle modules of this reception are from same group of liquid article image that checks in the box.
5) described density detection cellular installation is in described the 3rd density calculation machine, to the liquid article of crossing through described images match cell processing, container material quality according to liquid article, calculate in two kinds of situation its density feature, a) when the container of liquid article is low atomic number material such as plastics, utilize four visual angle algebraic reconstructions to calculate the ray approximation penetration thickness, with ratio relation bulk density feature between penetration thickness and absorption gray scale; B) when the container of liquid article is high z number material such as glass, the space geometry relation that at first forms in passage according to ray and liquid article zone, calculate liquid article cross section model and external diameter, then take the container wall thickness of this cross section model and external diameter and estimation as initial configuration, utilize optimization numerical analysis method iterative computation to go out density feature.
6) described high atomic number vessel liquid materials detection cellular installation is in described the 3rd density calculation machine, analysis is done in rejecting for the glass container wall, revise traditional elimination method, remove the impact of chamber wall, obtain the true projection gray level information of liquid article, obtain the material behavior of liquid article in the high atomic number container.
7) described decision-making alarm unit is installed on described the 3rd density calculation machine, judges by material and the combination of density two dimensional character of liquid article whether liquid article to be detected is liquid blasting material.
When channel-type four visual angle X ray liquid article safety check systems of the present invention start, conveyor is sent into liquid article in the transfer passage, the liquid towards article carry out transmission scan, when described the first detector, the second detector, the signal that the 3rd detector and the 4th detector receive is after system's control and signal processing circuit unit are processed and send described First collecting computer and second collecting computer to, give described the 3rd density calculation machine through switch again, and then the liquid towards article carry out safety inspection in the 3rd density calculation machine, and the display of check result at First collecting computer and second collecting computer shown.
The present invention has the following advantages:
1) checking ability is strong, and 4 brand-new visual angle X ray liquid are surveyed detection mode, can be to different sizes, and the difform dangerous liquid material of unlike material is effectively surveyed;
2) inspection speed is fast, can check simultaneously double liquid, can survey simultaneously 6 bottles of liquid at most, is suitable for the luggage safety checking field of high percent of pass;
3) detection sensitivity is high, can survey simultaneously two characteristic quantities of density and effective atomic number, surveys accurately.
In addition, the present invention also has the strong characteristics of antijamming capability, is highly suitable for the safety check system of the important places such as civil aviaton, railway, customs.
Description of drawings
Fig. 1 is a kind of channel-type four visual angle X ray liquid article safety check system synoptic diagram of the present invention;
Fig. 2 be in a kind of channel-type four visual angle X ray liquid article safety check systems of the present invention transfer passage and radiographic source position face structural representation;
Fig. 3 is the plan structure synoptic diagram of transfer passage and detector position in a kind of channel-type four visual angle X ray liquid article safety check systems of the present invention;
Fig. 4 is the side-looking structural representation of transfer passage and radiographic source in a kind of channel-type four visual angle X ray liquid article safety check systems of the present invention, detector position;
Fig. 5 is the workflow diagram of a kind of channel-type four visual angle X ray liquid article safety check systems of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing and specific embodiment.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the present invention includes: system control and signal processing circuit unit 17, First collecting computer 18, second collecting computer 20, the 3rd density calculation machine 19, conveyor 11, transfer passage 5, plastic pallet 6, four groups of x-ray sources and four groups of detectors, capture card 12, capture card 13, capture card 15, capture card 16, switch 14.
Such as Fig. 1, Fig. 2, Fig. 3 and shown in Figure 4, shine x-ray source 10 at the bottom of the right side of the present invention, the right side side is according to x-ray source 4, the top, right side is according to x-ray source 2, the end, middle part is the different azimuth that lays respectively at transfer passage 5 according to x-ray source 7, that is to say, on the positive apparent direction of described transfer passage 5, shine x-ray source 10 at the bottom of the described right side for being arranged at the right side bottom position of transfer passage 5, described right side side is the right side sidepiece that is arranged at transfer passage 5 according to x-ray source 4, shine x-ray source 2 at the bottom of the described right side for being arranged at the right side, bottom of transfer passage 5, shine x-ray source 7 at the bottom of the described middle part for being arranged at the bottom, middle part of transfer passage 5.
Equally, corresponding to shining x-ray source 4 according to x-ray source 10, right side side at the bottom of the above-mentioned right side; X-ray source 7 is shone at the bottom of shining x-ray source 2, middle part in the top, right side, and L-type first detector 9, second detector 3, three detector 8, U-shaped four detector 1 corresponding with it also is attached to respectively the diverse location of described transfer passage 5.
In addition, with respect to shining x-ray source 4 according to x-ray source 10, right side side at the bottom of the above-mentioned right side; X-ray source 7 is shone at the bottom of shining x-ray source 2, middle part in the top, right side, and can form a thin fan beam for the ease of the X-ray beam that each x-ray source sends, and in each x-ray source position a collimating apparatus is set all.
Wherein, at the bottom of the right side according to x-ray source 10 photograph visual angle module at the bottom of and the composition right side corresponding with the first detector 9, formed V3 visual angle module; Right side side photograph x-ray source 4 and the second detector 3 corresponding and side photograph visual angle, composition right side modules have formed V2 visual angle module; Right side top is corresponding with the 3rd detector 8 and form the right side and push up and shine the visual angle module according to x-ray source 2, has formed V1 visual angle module; The end, middle part according to x-ray source 7 corresponding with the 4th detector 1 and form in the middle part of the end shine the visual angle module, formed V4 visual angle module.
In addition, since utilize the double energy X-ray detection mode can carry out to inspected object the differentiation of material properties, therefore, in the present invention, V1 visual angle module, V2 visual angle module, V3 visual angle module, V4 visual angle module all adopt single x-ray source, and can launch the X ray of continuum; The first detector 9 of described L-type, the second detector 3, the 3rd detector 8 and the 4th U-shaped detector 1 adopt respectively overlapping placement, namely, the first detector 9 of L-type, the second detector 3, the 3rd detector 8 and the 4th U-shaped detector 1 be have low energy front high energy after the detectors of two kinds of different power spectrums responses, so it can obtain respectively low energy transmission signal and high energy transmission signal simultaneously; And then carry out material properties and differentiate being examined in the plastic pallet 6 object.
During application, at first plastic pallet 6 is placed on the conveyor 11, then maximum 6 liquid are placed in the pallet, after described four visual angle X-ray safety inspection systems start, conveyor 11 is at the uniform velocity advanced, plastic pallet 6 is transported in the transfer passage 5, plastic pallet 6 shines x-ray source 10 at the bottom of triggering respectively the right side, the right side side is according to x-ray source 4, the top, right side is according to x-ray source 2, the end, middle part, is according to x-ray source 7, each radiographic source successively sends X-ray beam, X-ray beam becomes thin fan beam after passing through the collimating apparatus that is positioned at radiographic source the place ahead, transmission is examined plastic pallet 6, the first detector 9 of L-type, the second detector 3, the 3rd detector 8 and the 4th U-shaped detector 1 receive respectively that the deamplification of liquid article 7 is crossed in corresponding transmission and send it to system control and signal processing circuit unit 17 carries out analog to digital conversion and signal correction is processed, thereby form corresponding V1 visual angle module, V2 visual angle module, V3 visual angle module, the projection image signal of V4 visual angle module, then, the projection image signal of this formation is imported into First collecting computer 18 and second collecting computer 20, advance again switch 14 and pass to the 3rd density calculation machine 19 and carry out safety inspection, and showed check result at First collecting computer 18 and second collecting computer 20.
Such as Fig. 1, shown in Figure 5, V1 visual angle module, V2 visual angle module, V3 visual angle module, V4 visual angle module all is connected with a capture card by signal processing circuit unit 17, each image pick-up card is used for acquisition of image data, the image that V1 visual angle module and V2 visual angle module gather is received by the First collecting computer, form double-channel collection, the image that same V3 visual angle module and V4 visual angle module gather is received by second collecting computer.After the processing through process step S1, S2 shown in Figure 5, original image and result of calculation are passed to the 3rd density calculation machine by switch 14, carry out process step S4 shown in Figure 5 after the calculating of step S7, by switch 14 the explosive area coordinate of surveying is turned back to First collecting computer and second collecting computer again, the explosive area that roll display image and detection obtain on the display of First collecting computer and second collecting computer.
Specific works flow process of the present invention is as follows:
After image acquisition was complete, step S2 was the calculation process of described low atomic number vessel liquid materials detection unit, at first needed to be partitioned into each container that checks in the box, and judged the material of each container.Cutting procedure divides two parts to finish: at first, each visual angle module map picture is adopted respectively a suitable experience gray threshold V
SCut apart, gray-scale value in the image is lower than V
SPart is marked as liquid article initial segmentation zone, then, uses Canny operator edge detection method classical in the technical field of image processing, obtains accurately to be examined the liquid article edge.After obtaining the exact boundary of container, one-row pixels according to the direction finding body centre position of container, calculate the relative value of the material value in the middle of the container edge and container in this delegation, the difference more atomic number of bulk container material is higher, obtain the material properties of container, represent the Vessel Boundary of unlike material with different gray-scale values.If be the low atomic number container, then the effective neighborhood of body is done gray average filtering and the operation of material medium filtering, obtain the material value of this testing liquid.
Step S3 be by the information communication unit with original image and comprise Vessel Boundary, container material quality, the result of calculation of low atomic number liquid in container materials detection information is transferred to the 3rd density calculation machine via switch 14.
Step S4 is the calculation process of images match unit, the 3rd density calculation machine obtains V1 visual angle module, V2 visual angle module, the V3 visual angle module that step S3 transmits, and the doubtful explosive area with each visual angle module after the Vessel Boundary information of V4 visual angle module exists in the RECT structure array of each visual angle module definition.These arrays of scan round one group of doubtful explosive area of poor four visual angle modules in threshold range are mated channel direction in groups end to end, check whether the polygon that this border of organizing doubtful explosive area surrounds is reasonable in passage, unreasonable this group of abandoning, then seek the coupling group of repetition since a visual angle module, the absolute value that differs end to end by doubtful explosive area channel direction and the relation of same group of container position of each visual angle module are removed the repeated matching group, finally obtain correct matching result.
Step S5 is the calculation process of density detection unit, and the density detection unit is divided into following two subelements:
1) when container material quality is low atomic number material such as plastics, by four visual angle ART algebraically iterative approximations, obtains the cross sectional shape of liquid article.It is to be noted, it is to be to carry out under the substantially homogeneous prerequisite according to liquid article internal liquid density that the above ART algebraically iterative approximation calculates, be that each reconstruction pixel value is identical on the liquid article cross section, but not liquid article cross section reconstruction pixel value is 0, that is to say, on the reconstructed image liquid article region pixel value for the size of expression pixel equal on the occasion of, the other parts value is 0; According to the liquid article cross sectional shape that reconstructs, add up each visual angle module projected pixel ray penetration range of its correspondence, each group penetration range and corresponding high energy gray scale thereof, penetration range by inquiring about prior foundation-absorption gray scale-electron density table, obtain a density feature, further, add up rebuilding all density features corresponding to cross section, calculate the liquid article density feature;
2) when container material quality is high z number material such as glass:
(a). container is carried out the segmentation that meets high density container characteristics cut, particularly the segmentation that has the overlapping V2 visual angle module of container is cut.
(b). the overlapping situation according to container in the module of V2 visual angle, find zone suitable in the current container to be used for doing subsequent analysis, this regional overlap scheme is comparatively simple, is fit to liquid level calculating five equilibrium and analyses.
(c). data de-noising obtains four level and smooth visual angle module data for projection.
(d). according to the projection gray level curve of V2 visual angle module, V3 visual angle module, judge whether liquid in container is full; If not full, find liquid level position according to the feature locations of curve, according to the final liquid level that calculates of space geometry relation.
(e). as parameter to be calculated, utilize iteration optimization algorithms to obtain the attenuation coefficient of liquid, the information such as thickness of container the attenuation coefficient of chamber wall, the attenuation coefficient of liquid, the thickness (wall thickness that its initial value obtains with reference to S3) of chamber wall, the height of liquid level, the identity (container, liquid, air) of each pixel of cross section etc.
(f) if. container is bulge, and then the identity of each pixel beyond the circumference is fixed as air in the cross section; (for example square-section) then gives rule according to shape knowledge to the iterative process among the E. and instructs if other type of container.Finally obtain the attenuation coefficient of high density liquid in container, and more accurate chamber wall thickness.Attenuation coefficient by inquiring about prior foundation-electron density table obtains the liquid article density feature.
Next step S6 is the calculation process of high atomic number vessel liquid materials detection unit, namely calculates the material value of high atomic number liquid in container.Experimental results show that the low atomic number container to not impact of internal liquid detection, but the high atomic number container then can have a strong impact on the material behavior of internal liquid.Step S6 rejects for the glass container wall and does analysis, revises traditional elimination method, removes the impact of chamber wall, obtains the true projection gray level information of liquid, calculates the material characteristics of liquid with true high low energy data again.
Arrive this, this two dimensional feature of the material of each testing container and density obtains, enters step S7, by the decision-making alarm unit decision process of reporting to the police.If this checks what the material that do not have liquid in container in box and density combinations were reported to the police, then First collecting computer and second collecting computer roll display original image, wherein the First collecting computer shows V1 visual angle module map picture, and second collecting computer shows V2 visual angle module map picture.If this checks that box has warning liquid, then the information communication unit by the 3rd density calculation machine, the border of warning liquid container is passed to First collecting computer and second collecting computer, draw the position in explosive area in the time of the roll display original image.
Above-mentioned steps is a whole detection flow process, and First collecting computer and second collecting computer continuous acquisition inspection box image under rational spacing are processed.
The above; be the specific embodiment of the present invention only, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in scope disclosed by the invention; the variation that can expect easily or replacement all should be encompassed in the protection domain of claim of the present invention.
Claims (3)
1. channel-type four visual angle X ray liquid article safety check systems, it is characterized in that, comprise: system's control and signal processing circuit unit, First collecting computer, second collecting computer, the 3rd density calculation machine, switch, conveyor, transfer passage, four groups of x-ray sources and four groups of detectors connect by LAN between described First collecting computer, described second collecting computer and the 3rd density calculation machine; Every group of x-ray source and detector are called a visual angle module, comprise altogether four visual angle modules, and described four visual angle modules comprise: the top, right side according to visual angle module, right side horizontal side according to visual angle module, right side at the bottom of according at the bottom of visual angle module and the middle part according to the visual angle module; The top, right side comprises that according to the visual angle module top, right side according to x-ray source and the first detector, consists of V1 visual angle module; The right side horizontal side comprises the right side horizontal side according to x-ray source and the second detector according to the visual angle module, consists of V2 visual angle module; Shine at the bottom of the right side and shine visual angle x-ray source and the 3rd detector at the bottom of the visual angle module comprises the right side, consist of V3 visual angle module; The end, middle part, comprise that according to the visual angle module end, middle part is according to visual angle x-ray source and the 4th detector, consist of V4 visual angle module, described V1 visual angle module, V2 visual angle module, V3 visual angle module, V4 visual angle module all is connected with a capture card by signal processing circuit unit, wherein the First collecting computer connects the image pick-up card of described V1 visual angle module and described V2 visual angle module, reception is from the view data of described V1 visual angle module and described V2 visual angle module, second collecting computer connects the image pick-up card of described V3 visual angle module and described V4 visual angle module, receives the view data from described V3 visual angle module and described V4 visual angle module.
2. a kind of channel-type four visual angle X ray liquid article safety check systems according to claim 1, it is characterized in that, the 3rd detector of the first detector of described V1 visual angle module, the second detector of V2 visual angle module, V3 visual angle module is the L-type detector, and the 4th detector of described V4 visual angle module is U-shaped detector.
3. a kind of channel-type four visual angle X ray liquid article safety check systems according to claim 1, it is characterized in that, in described First collecting computer and second collecting computer image acquisition units, low atomic number vessel liquid materials detection unit, information communication unit have been installed all; Described the 3rd density calculation machine installed images match unit, density detection unit, high atomic number vessel liquid materials detection unit, decision-making alarm unit, information communication unit, and the described image acquisition units that is installed in First collecting computer and second collecting computer forms acquisition workstation;
Described low atomic number vessel liquid materials detection unit is for the zone that the image from described four visual angle modules that obtains is carried out image segmentation and orients liquid article;
Described information communication unit is used for transmitting original image, result of calculation, control command and information between described First collecting computer, second collecting computer and the 3rd density calculation machine;
Described images match unit be used for to from the view data of described four visual angle modules and materials detection result through the data of described four visual angle modules of confirming this reception after the images match whether from same group of liquid article image that checks box;
Described density detection unit is used for calculating the density feature to the liquid article of crossing through described images match cell processing;
Analysis is done for rejecting for the glass container wall in described high atomic number vessel liquid materials detection unit, revise traditional elimination method, remove the impact of chamber wall, obtain the true projection gray level information of liquid article, obtain the material behavior of liquid article in the high atomic number container;
Described decision-making alarm unit is used for judging by the material of liquid article and the combination of density two dimensional character whether liquid article to be detected is liquid blasting material.
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| CN105784741A (en) * | 2015-07-10 | 2016-07-20 | 公安部第研究所 | Multi-visual-angle X ray safety check device |
| CN107202808A (en) * | 2017-06-14 | 2017-09-26 | 上海英曼尼安全装备有限公司 | A kind of double source double-visual angle safety inspection method and its system |
| CN111856604A (en) * | 2020-07-31 | 2020-10-30 | 李国军 | Gate type oblique angle bottom lighting X-ray machine |
| CN112818875A (en) * | 2021-02-04 | 2021-05-18 | 成都理工大学 | Flammable liquid detection signal denoising method based on low-rank sparse decomposition |
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