阅读说明：本技术 一种飞点扫描装置及安检设备 (Flying spot scanning device and security check equipment ) 是由 熊凯 韩畅 沈海平 于 2020-06-10 设计创作，主要内容包括：本发明公开了一种飞点扫描装置及安检设备,其中飞点扫描装置包括：带有狭缝的斩波轮；用于驱动斩波轮旋转的旋转机构；用于发射X射线光束的X射线源；用于接收X射线源的X射线探测器；设置于X射线源和斩波轮之间的前置准直狭缝。本发明中通过驱动斩波轮做旋转运动,使得X射线源通过前置准直狭缝后,通过快速旋转的斩波轮产生极细X射线光束,进而产生对待扫描客体的某一维度方向(如Y方向)飞点扫描,同时通过待扫描客体和扫描平台的相对运动产生另一维度方向(如X方向)的一维扫描,从而最终实现进行对待扫描客体平面的扫描操作,进而实现X射线图像的快速重构成像,提高安检效率及准确率。(The invention discloses a flying spot scanning device and a security inspection device, wherein the flying spot scanning device comprises: a chopper wheel with slits; the rotating mechanism is used for driving the chopping wheel to rotate; an X-ray source for emitting an X-ray beam; an X-ray detector for receiving the X-ray source; and a front collimating slit disposed between the X-ray source and the chopper wheel. According to the invention, the chopping wheel is driven to rotate, so that an X-ray source generates an ultrafine X-ray beam through the chopping wheel which rotates rapidly after passing through the front collimating slit, flying spot scanning in a certain dimension direction (such as Y direction) of an object to be scanned is generated, and meanwhile, one-dimensional scanning in another dimension direction (such as X direction) is generated through the relative motion of the object to be scanned and the scanning platform, so that the scanning operation of the plane of the object to be scanned is finally realized, the rapid reconstruction imaging of an X-ray image is further realized, and the security inspection efficiency and the accuracy are improved.)

1. A flying spot scanning apparatus, comprising:

a chopper wheel with slits;

the rotating mechanism is used for driving the chopping wheel to rotate;

an X-ray source for emitting an X-ray beam;

an X-ray detector for receiving the X-ray source;

the front collimation slit is arranged between the X-ray source and the chopper wheel;

the X-ray beam emitted by the X-ray source sequentially passes through the front collimating slit and the slit on the chopper wheel in a rotating state, and flying spot scanning of the X-ray beam is realized.

2. The flying spot scanning apparatus according to claim 1, wherein there are two X-ray detectors, there is a slit between the two X-ray detectors, the slit between the X-ray detectors, the center of the pre-collimating slit, and the X-ray source are on the same axis, and the center of rotation of the chopper wheel is offset from the axis.

3. The flying spot scanning device as claimed in claim 1 or 2, wherein the chopper wheel is provided with a plurality of slits distributed along a radial direction.

4. The flying spot scanning apparatus according to claim 3, wherein the portion of the chopper wheel other than the slit is shielded by a high atomic number material.

5. The flying spot scanning apparatus according to claim 4, wherein said rotating mechanism includes a rotating shaft and a driving device for driving the rotating shaft to rotate, said chopper wheel being provided on the rotating shaft.

6. A security inspection apparatus, comprising:

the scanning platform is used for bearing the object to be scanned and can move relative to the object to be scanned;

the flying spot scanning device is used for scanning an object to be scanned on a scanning platform and is as claimed in any one of claims 1 to 5;

and the control device is in communication connection with the X-ray detector.

7. The security inspection apparatus according to claim 6, further comprising a photoelectric sensor for sensing a position of the object to be scanned, wherein the control device controls the driving of the rotation mechanism and the scanning operation of the X-ray detector by receiving sensing information of the photoelectric sensor.

8. The security inspection apparatus according to claim 6 or 7, further comprising a display device communicatively connected to the control device and configured to display a complete image of the object to be scanned reconstructed by the control device.

9. The security inspection apparatus of claim 7, further comprising an automatic identification device in communication with the control device and configured to automatically identify hazardous materials contained in the object to be scanned.

10. The security inspection apparatus of claim 6, wherein the scanning platform includes a support base, a support top plate oppositely disposed above the support base, and a plurality of support side plates disposed between and connecting the support base and the support top plate; the X-ray detector is characterized in that shielding regions are formed in regions among the supporting base, the supporting top plate and the supporting side plates, the flying spot scanning device is located between the shielding regions, and the X-ray detector is arranged on the supporting top plate.

Technical Field

The invention belongs to the technical field of security inspection, and particularly relates to a flying spot scanning device and security inspection equipment.

Background

In recent years, the electronic commerce development of China is witnessed rapidly, the rapid and efficient development of the logistics express industry is promoted, and the combination of the network and the express brings brand-new convenient life to people. In 2017, the total express delivery amount in China exceeds 400 hundred million, and occupies half of the total amount of the whole world. However, with the development of the well-spraying type in the logistics express industry, and many express enterprises adopt an franchised operation mode, the enterprises are often difficult to drip and leak water on the receiving, checking and allocating and checking of each network point. Some criminals use the new industry to engage in illegal criminal activities, so that the criminal cost is low, the risk is low, and the criminal means are more concealed. For example, drug trafficking, criminals often send express delivery by carrying drugs in conventional articles, and even if the couriers take and check the drugs, the criminals cannot easily detect the drugs; the whole of the gun and other contraband articles is easy to be broken into parts, and certain parts are difficult to be found as the contraband articles. Contraband such as gun, drugs, explosives are very easy to transport through logistics and express delivery channels, and extremely serious threat is caused to social public safety. Therefore, the logistics express industry increases the supervision on packages and checks potential safety hazards, and is very urgent. As the countries with the first fast quantity in the world nowadays, the system has extremely important significance for the fast, comprehensive and accurate security inspection technology of logistics express delivery.

On the other hand, border areas are often accompanied by a large number of inbound and outbound people streams and import and export goods transportation, and besides the need to manage and control legitimate inbound and outbound people streams, there is also a need to prevent and control the smuggling of drugs, weapons, even endangered animals and their products or other contraband. Whether the control of the border area is perfect or not relates to the main right and the dignity of the security country, maintains the safety and the stability of the country and the area, and maintains the economic benefit and the market order of the country. Therefore, the introduction of security check related equipment is crucial for the accompanying luggage of the entry and exit personnel, the mailed entry and exit letters, the packages and even the containers and goods at the entrance and exit.

The X-ray has strong penetrating power, and the detection technology of the X-ray has important application in the fields of security inspection and nondestructive detection. The traditional security inspection and nondestructive detection technology is X-ray fluoroscopy, and is based on the attenuation principle of substances to X-rays. In the field of security inspection, drugs and explosives are low-atomic-number and low-density organic matters, and are attenuated very weakly to X-rays and are almost transparent, so that the detection effect of the perspective technology is very poor. In the field of nondestructive testing, perspective has a good detection effect on small parts, but large metal parts have poor imaging contrast due to a strong attenuation effect, and the detection of cracks, damages and the like on the surface layer of an aviation part is carried out. Therefore, it is necessary to develop a new detection technology to enrich the means of contraband pursuit and nondestructive detection and improve the accuracy and precision of detection.

Disclosure of Invention

The invention provides a flying spot scanning device, which improves the security inspection efficiency and accuracy.

The technical scheme of the invention is as follows: a flying spot scanning apparatus comprising:

a chopper wheel with slits;

the rotating mechanism is used for driving the chopping wheel to rotate;

an X-ray source for emitting an X-ray beam;

an X-ray detector for receiving the X-ray source;

the front collimation slit is arranged between the X-ray source and the chopper wheel;

the X-ray beam emitted by the X-ray source sequentially passes through the front collimating slit and the slit on the chopper wheel in a rotating state, and flying spot scanning of the X-ray beam is realized.

Preferably, there are two X-ray detectors, there is a slit between the two X-ray detectors, the slit between the X-ray detectors, the center of the pre-collimating slit and the X-ray source are on the same axis, and the rotation center of the chopper wheel is offset from the axis.

Preferably, the chopper wheel is provided with a plurality of slits distributed along the radial direction.

Preferably, the parts except the slit on the chopper wheel are shielded by a material with a high atomic number.

Preferably, the rotating mechanism includes a rotating shaft and a driving device for driving the rotating shaft to rotate, and the chopper wheel is disposed on the rotating shaft.

The invention also provides a security inspection device, comprising:

the scanning platform is used for bearing the object to be scanned and can move relative to the object to be scanned;

the flying spot scanning device is used for scanning an object to be scanned on the scanning platform;

and the control device is in communication connection with the X-ray detector.

Preferably, the scanning device further comprises a photoelectric sensor for sensing the position of the object to be scanned, and the control device controls the driving of the rotating mechanism and the scanning action of the X-ray detector by receiving sensing information of the photoelectric sensor.

Preferably, the scanning device further comprises a display device which is in communication connection with the control device and is used for displaying the complete image of the object to be scanned, which is obtained by the reconstruction of the control device.

Preferably, the scanning device further comprises an automatic identification device which is in communication connection with the control device and is used for automatically identifying dangerous goods contained in the object to be scanned.

Preferably, the scanning platform comprises a supporting base, a supporting top plate oppositely arranged above the supporting base, and a plurality of supporting side plates positioned between the supporting base and the supporting top plate and used for connecting the supporting base and the supporting top plate; the X-ray detector is characterized in that shielding regions are formed in regions among the supporting base, the supporting top plate and the supporting side plates, the flying spot scanning device is located between the shielding regions, and the X-ray detector is arranged on the supporting top plate.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the chopping wheel is driven to rotate, so that an X-ray source generates an ultrafine X-ray beam through the chopping wheel which rotates rapidly after passing through the front collimating slit, flying spot scanning in a certain dimension direction (such as Y direction) of an object to be scanned is generated, and meanwhile, one-dimensional scanning in another dimension direction (such as X direction) is generated through the relative motion of the object to be scanned and the scanning platform, so that the scanning operation of the plane of the object to be scanned is finally realized, the rapid reconstruction imaging of an X-ray image is further realized, and the security inspection efficiency and the accuracy are improved.

Drawings

Fig. 1 is a schematic structural diagram of a security inspection apparatus according to the present invention.

Fig. 2 is a schematic structural diagram of another security inspection apparatus according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Further, in the exemplary embodiments, since the same reference numerals denote the same components having the same structure or the same steps of the same method, if an embodiment is exemplarily described, only a structure or a method different from the already described embodiment is described in other exemplary embodiments.

Throughout the specification and claims, when one element is described as being "connected" to another element, the one element may be "directly connected" to the other element or "electrically connected" to the other element through a third element. Furthermore, unless explicitly described to the contrary, the term "comprising" and its corresponding terms should only be taken as including the stated features, but should not be taken as excluding any other features.

Fig. 1 is a schematic structural diagram of a security inspection apparatus according to an embodiment of the present application. As shown in fig. 1, the security inspection apparatus includes a scanning platform 1 and a flying spot scanning device, wherein the flying spot scanning device includes: the X-ray scanning device comprises a rotating shaft 2, a chopping wheel 3, an X-ray source 4, a front collimation slit 5 and an X-ray detector 6, wherein the rotating shaft 2 is vertically arranged on a scanning platform 1, and the chopping wheel 3 is arranged on the rotating shaft 2; wherein, the scanning platform 1 comprises a shielding structure made of high atomic number material, and the object to be scanned is placed on the scanning platform 1. When an object to be scanned (such as a vehicle and an object carried by the vehicle) moves on the upper part of the scanning platform 1, the chopper wheel 3 rotates around a shaft along with the high-speed rotation of the rotating shaft 2, so that flying spot scanning of the object to be scanned is realized, and quick X-ray backscatter imaging is realized.

Among them, X-ray backscatter imaging detection is a precision detection technique developed in recent years. Based on the Compton scattering principle, the technology has higher sensitivity to low-density organic matters and can effectively detect contraband products such as drugs and explosives. The ray source and the detector are positioned at the same side, so that the device is particularly suitable for detecting large objects, in particular to the online nondestructive precise detection of vehicles and vehicle-mounted articles. Therefore, the security inspection efficiency and accuracy are greatly improved. In an embodiment, the chopper wheel 3 positioned on the rotating shaft 2 can be driven to perform one-dimensional flying spot scanning in the Y-axis direction on the object plane to be scanned at the upper end of the scanning platform 1 through the high-speed rotating motion of the rotating shaft 2, and simultaneously, one-dimensional scanning in the X-axis direction is generated through the relative motion of the object to be scanned and the scanning platform, so that an X-ray backscatter image can be reconstructed finally, and rapid detection is realized. It should be understood that, in the embodiment of the present application, different operation speeds of the rotating shaft 2 may be selected according to requirements of an actual application scenario, as long as the flying spot generated by the selected X-ray source 4 can meet the two-dimensional planar scanning accuracy of the object to be scanned, and the specific operation speed of the rotating shaft 2 is not limited in the embodiment of the present application.

The embodiment provides a security inspection equipment, can high-speed rotatory rotation axis through vertical setting on scanning platform to set up scanning device on the rotation axis, utilize the rotation axis to drive chopper wheel above it in the rotary motion process and carry out flying spot scanning operation to the object of treating scanning of scanning platform upper end, utilize simple structure to realize fast treating the two-dimensional plane scanning operation of scanning the object, thereby realize quick X ray backscatter imaging, improve security inspection efficiency and rate of accuracy.

In one embodiment, as shown in fig. 1, the scanning platform 1 may include: a supporting base 11, a supporting top plate 12 and a supporting side plate 13; the supporting top plate 12 is disposed corresponding to the supporting base 11 and above the supporting base 11, and the supporting side plate 13 is disposed between the supporting base 11 and the supporting top plate 12 and connects the supporting top plate 12 and the supporting base 11. A shielding structure is formed by the supporting base 11, the supporting top plate 12 and the supporting side plates 13, when an object to be scanned is located above the shielding structure, the X-ray source 4 and the X-ray detector 6 can perform fast scanning imaging on the object to be scanned by the rotation of the chopper wheel 3, and after the scanning is completed, the object to be scanned can be freely far away from the structure. In an embodiment, the scanning platform 1 may include four supporting side plates 13, and the four supporting side plates 13 are respectively disposed on four sides of the supporting base 11 and the supporting top plate 12 to realize the stable supporting base 11 and the supporting top plate 12. It should be understood that the number and the arrangement positions of the supporting side plates 13 may be selected according to different practical application scenarios in the embodiment of the present application, as long as the selected number and the arrangement positions of the supporting side plates 13 can stably support the base 11 and the top supporting plate 12 and form a shielding structure with the base 11 and the top supporting plate 12, and the specific number and the specific arrangement positions of the supporting side plates 13 are not limited in the embodiment of the present application.

In one embodiment, as shown in fig. 1, a driving device 14 may be disposed on the supporting side plate 13, the driving device 14 is connected to the rotating shaft 2, and the driving device 14 drives the rotating shaft 2 to perform high-speed rotation. The driving device 14 is arranged to drive the rotating shaft 2 to rotate at a high speed, and then the chopper wheel 3 arranged on the rotating shaft 2 is driven to rotate around the shaft and perform rapid scanning imaging on an object to be scanned. In an embodiment, the driving device 14 may be a driving motor or other component having driving capability, but it should be understood that the embodiment of the present application may select different specific structures of the driving device 14 according to different practical application scenarios, as long as the selected specific structures of the driving device 14 can drive the rotating shaft 2 to perform high-speed rotating motion, and the embodiment of the present application is not limited to the specific structures of the driving device 14.

In an embodiment, as shown in fig. 1, the drive means 14 and the rotation shaft 2 may be connected by a transmission screw structure 15. A transmission screw rod structure 15 is arranged on the supporting side plate 13, one end of the rotating shaft 2 is connected with the supporting side plate 13 through the transmission screw rod structure, and the driving device 14 drives the rotating shaft 2 to do high-speed rotating motion. In another embodiment, the drive means 14 and the rotary shaft 2 may be connected by a gear structure. The gear structure comprises a gear and a rack, the gear is connected with the rotating shaft 2, and the driving device 14 drives the gear to move along the rack, so that the rotating shaft 2 is driven to rotate at a high speed. It should be understood that the embodiment of the present application may select different connection structures of the driving device 14 and the rotating shaft 2 according to different practical application scenarios, for example, the driving device 14 and the rotating shaft 2 may be connected by a cam or the like, as long as the selected connection structure of the driving device 14 and the rotating shaft 2 can achieve high-speed rotation motion of the rotating shaft 2, and the specific connection structure of the driving device 14 and the rotating shaft 2 is not limited in the embodiment of the present application.

In one embodiment, as shown in fig. 1, the chopper wheel 3 is provided with 4 radially distributed slits, and the area outside the slits is shielded by a high atomic number material. The cone beam generated by the X-ray source 4 forms a fan-shaped beam after passing through the front collimating slit 5, and then forms flying spots after passing through the slit of the chopper wheel 3, thereby realizing one-dimensional scanning in the Y-axis direction on the object plane to be scanned. However, it should be understood that the number and the arrangement positions of the slits of the chopper wheel 3 may be selected according to different practical application scenarios, as long as the selected number and the arrangement positions of the slits of the chopper wheel 3 enable the X-ray source to form flying spot scanning on the object plane to be scanned, and the specific number and the specific arrangement positions of the slits of the chopper wheel 3 are not limited in the embodiment of the present application.

In one embodiment, chopper wheel 3 rotates at high speed about rotational axis 2, as shown in FIG. 1. The rotation axis is offset from the central axis formed by the X-ray source, the center of the collimating slit and the central slit of the X-ray detector. The cone-shaped light beam generated by the X-ray source 4 can smoothly pass through the slit of the chopper wheel 3 to form flying spots. However, it should be understood that the offset distance between the rotation axis and the central axis of the chopper wheel 3 may be selected according to different practical application scenarios, as long as the selected offset distance enables the X-ray source to form flying spot scanning on the object plane to be scanned, and the specific setting of the offset distance is not limited in the embodiment of the present application.

In an embodiment, as shown in fig. 1, the flying spot scanning device may include at least two X-ray detectors 6, and the two X-ray detectors 6 are arranged on the upper end of the scanning platform 1 in parallel along the horizontal direction, and a slit position is reserved between the two X-ray detectors 6. In a further embodiment, the flying spot scanning apparatus may comprise a plurality of X-ray detectors 6. If the number of the X-ray detectors 6 is increased, the scanning range can be expanded, but the complexity of the scanning data acquisition circuit is increased, and the scanning efficiency is reduced. Therefore, the embodiment of the application can ensure the scanning efficiency and avoid waste caused by excessive number of the X-ray detectors 6 by arranging 2X-ray detectors 6. It should be understood that, in the embodiment of the present application, different numbers of the X-ray detectors 6 may also be selected according to different practical application scenarios, as long as the number of the selected X-ray detectors 6 can meet the scanning requirement, and the specific number of the X-ray detectors 6 is not limited in the embodiment of the present application.

In the foregoing embodiment, the X-ray detector 6 employs a scintillator detection principle method, and it should be understood that, in this embodiment of the present application, different detection principle methods of the X-ray detector 6 may also be selected according to different practical application scenes, as long as the selected detection principle method of the X-ray detector 6 can meet the requirement of X-ray backscatter scanning imaging, and the specific detection principle method of the X-ray detector 6 is not limited in this embodiment of the present application.

Fig. 2 is a schematic structural diagram of another security inspection apparatus, and as shown in fig. 2, a photoelectric sensor 8 is respectively disposed at a position where the object 7 to be scanned enters and leaves the scanning platform 1. In this embodiment, a photo-coupler type photosensor is used. When the object 7 to be scanned enters and leaves the scanning platform 1, the photoelectric sensor 8 can provide corresponding control information. It should be understood that, in the embodiment of the present application, different types and numbers of the photosensors 8 may also be selected according to different practical application scenarios, as long as the selected types and numbers of the photosensors 8 can meet the scanning requirement, and the specific types and numbers of the photosensors 8 are not limited in the embodiment of the present application.

In an embodiment, as shown in fig. 2, the security inspection apparatus may further include a control device 9 in communication connection with the X-ray detector 6, configured to perform image fusion and reconstruction on scan data acquired by the plurality of X-ray detectors 6 to obtain a complete image of the object 7 to be scanned, where the control device 9 may further control the operation of the driving device 14 and the scanning operation of the X-ray detector 6 by receiving control information of the photosensor 8. It should be understood that the functions of controlling the operation of the driving device 14 and the scanning operation of the X-ray detector 6 may be performed by additional control units in the embodiments of the present application, such as control units respectively disposed inside the driving device 14 and the X-ray detector 6, which are not limited by the embodiments of the present application.

In an embodiment, as shown in fig. 2, the security inspection apparatus may further include a display device 10 communicatively connected to the control device 9 for displaying a complete image of the object 7 to be scanned reconstructed by the control device 9.

In one embodiment, as shown in fig. 2, the security inspection apparatus may further comprise an automatic identification device 11 communicatively connected to the control device 9 for automatically identifying the hazardous materials contained in the object 7 to be scanned. In a further embodiment, the automatic identification device 11 may include a neural network model, specifically, the neural network model may include a deep learning neural network model, and through training of a large number of samples, the automatic identification precision of the neural network model may be ensured, and the automatic identification is assisted while manually checking, so that the accuracy of the check may be further improved, and the workload of the manual work may also be greatly reduced. In an embodiment, in the training process of the neural network model, operations such as rotating and cutting can be performed on training samples (including images of objects to be scanned of dangerous goods) to obtain more training samples, and the universality of the training samples can be improved through the operations, so that the situation that the training samples cannot be identified due to partial shielding or different placement angles in the actual identification process is avoided, and the identification accuracy of the neural network model is improved. Through deep learning training, the neural network model can automatically identify suspected dangerous goods and mark the corresponding suspected dangerous goods for manual review, and the result of the manual review can be used as a training sample to train the neural network model again so as to further improve the accuracy of automatic identification. It should be understood that, in the embodiment of the present application, a specific method for automatic identification may be selected according to requirements of an actual application scenario, for example, an article to be automatically identified may also be extracted in an image identification manner and compared with a standard image of a dangerous article or a contraband, so as to obtain the dangerous article or the contraband in an object to be scanned.

The security inspection equipment in this embodiment may include at least one flying spot scanning device as described above, and the rotating shaft capable of rotating at a high speed is vertically disposed on the scanning platform, and the chopper wheel is disposed on the rotating shaft, and the chopper wheel on the rotating shaft is driven to rotate around the shaft during the rotating motion by the rotating shaft, so that the X-ray source disposed at the lower end of the chopper wheel passes through the front collimating slit and then generates an ultra-fine X-ray beam by the chopper wheel rotating at a high speed. And then, one-dimensional flying spot scanning is performed on the upper end of the scanning platform in the Y-axis direction of the object plane to be scanned, and meanwhile, one-dimensional scanning in the X-axis direction is generated through the relative motion of the object to be scanned and the scanning platform. Finally, the scanning operation of the object plane to be scanned is realized, so that the X-ray image is quickly reconstructed and imaged, and the security inspection efficiency and accuracy are improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.