CN101592622A - Multi-view X-ray baggage automatic detection device for explosives with real dual energy - Google Patents

Abstract

A multi-view X-ray automatic detection device for luggage explosives with real dual energy, including a system control and signal processing circuit unit, a comprehensive processing computer, a detection unit, a conveyor and a conveying channel; wherein the detecting unit is installed in the conveying channel , and includes a left bottom-illuminated angle of view module that adopts a real dual-energy X-ray detection method, and a left-side top-illuminated angle of view module and a right bottom-illuminated angle of view module that both adopt a dual-energy X-ray detection method of one source and two detectors. In application, the conveyor sends the luggage into the conveying channel, and uses the three-angle X-ray to perform transmission scanning on the luggage. The detector receives the signal and sends it to the system control and signal processing circuit unit for processing, and then sends it to the comprehensive processing computer. The integrated processing computer automatically detects the explosives in the luggage, and displays the detection results on the integrated processing computer. The invention has the advantages of high detection precision, fast detection speed, high detection sensitivity and strong anti-interference ability.

Description

Multi-view X-ray baggage automatic detection device for explosives with real dual energy

technical field

The invention relates to a dangerous article detection device, in particular to a detection device for automatic detection of luggage explosives by using dual-energy X-rays.

Background technique

At present, it has become a security measure widely used in the world to carry out security checks on luggage carried by people passing through important entrances and exits, and for luggage security checks, the device for security checks using X-rays is currently the most widely used one. In recent years, X-ray safety inspection devices have developed rapidly due to the needs of aviation, railway, and customs security.

In the earliest used X-ray security inspection devices, it adopts single-view single-energy X-ray technology. This type of inspection device is usually mainly composed of a single X-ray generator, collimator, detector, channel, conveyor belt and box. When the system is working, the conveyor belt will send the luggage to be inspected into the channel, and the collimated fan-shaped X-ray beam will pass through the luggage on the conveyor belt, and the detector will receive the X-ray signal generated when the material is absorbed, and further An image signal is formed and displayed on a monitor. The single-view single-energy X-ray security inspection device judges whether there may be known contraband by observing the shape features of each area in the image signal.

With the improvement of safety inspection requirements, safety inspection devices using dual-energy X-ray technology are gradually being widely used. At present, there are two types of dual-energy X-ray safety inspection devices, one is standard or conventional dual-energy X-ray X-ray baggage inspection device, which uses one source and two detectors, quasi-dual-energy X-rays, the baggage of this device passes slowly, and requires manual inspection, usually used in the inspection of conventional hand baggage and checked baggage; the other is advanced The dual-energy X-ray security inspection device (AT machine), which uses dual-source and dual-detectors, produces real dual-energy X-rays. This device has a fast baggage passing speed and can realize automatic detection. It is usually used in multi-level automatic check-in baggage inspection. system. Among them, the dual-energy X-ray safety inspection device can estimate the effective atomic number of the material, and can use the difference in the X-ray absorption performance of a certain material for different energies to distinguish the material, so that substances that cannot be identified by shape can be identified by material properties. to distinguish.

In order to meet the safety inspection requirements of higher detection accuracy, X-CT technology has been introduced into the field of safety inspection, so a CT-type explosives safety inspection device using X-CT technology has appeared. At present, a typical X-CT security inspection device mainly includes two parts: a device for DR detection and acquisition of two-dimensional image projection and a device for CT scanning and acquisition of tomographic images. This type of security detection device has extremely high density resolution, but in the detection process, it needs to process a huge amount of data, and the time to obtain images is much longer than other systems, and the manufacturing cost is also very high.

In response to the above situation, a multi-view X-ray automatic detection device for luggage explosives came into being, which uses multiple fixed-view dual-energy X-rays to scan the material, and obtains the material characteristics of the object through the dual-energy X-ray image signal, and through The multi-view projection image reconstructs the cross-section of the object to obtain the material density characteristics, so as to achieve a more accurate detection of the physical properties of the object.

Now, multi-view X-ray detection devices have been applied in medical and industrial inspection. The layout adopts two bottom viewing angles and one horizontal angle of view. The advantage of this layout is that the correlation of each angle of view in the channel is small, which is conducive to the three-dimensional reconstruction of the object under inspection. However, this multi-angle layout is easy to cause horizontal placement. The items in the luggage overlap seriously, and it is difficult to extract the features of the inspected object in the projection images of each viewing angle. In addition, the multi-view X-ray automatic detection device for explosives of German Heimann Company adopts the five-view working mode of 3 sources and 5 probes, and adopts 2 bottom radiation sources and 1 top radiation source in the multi-view layout. Each bottom radiation source corresponds to two sets of detectors, and the top radiation source corresponds to one set of detectors, forming a total of five viewing angles. This multi-view device performs three-dimensional reconstruction through the projection images of five viewing angles. The advantage is that the reconstruction is redundant. The degree of ambiguity is large and the degree of ambiguity is small, but the feature matching of the five viewing angles is difficult.

Contents of the invention

In view of the problems existing in the existing multi-angle X-ray inspection devices, the main purpose of the present invention is to provide a material that can avoid the unidentifiable disadvantage of overlapping items under a single angle of view, and obtain the inspected object through multi-angle X-ray imaging. Features and density features, high detection sensitivity, high accuracy and strong anti-interference ability, with real dual-energy multi-view X-ray automatic detection device for luggage explosives.

In order to achieve the above object, the multi-view X-ray automatic detection device for luggage explosives with real dual energy according to the present invention adopts the following technical scheme:

The multi-view X-ray automatic detection device for luggage explosives with real dual energy includes a system control and signal processing circuit unit, a comprehensive processing computer for data transmission with the system control and signal processing circuit unit, and is controlled by the system control and signal processing The detection unit of the circuit unit, the conveyor, and the conveying channel; wherein, the detecting unit is installed in the conveying channel, and includes a left-side top-viewing angle module that adopts a dual-energy X-ray detection method of one source and two detectors, and adopts a source The right bottom viewing angle module of the two-detector dual-energy X-ray detection method and the left bottom viewing angle module adopting the real dual-energy X-ray detection method; the left top viewing angle module includes the left top X-ray source and the first A detector; the right bottom-illuminating angle of view module includes a right-side bottom-illuminating X-ray source and a second detector; the left-side bottom-illuminating angle of view module includes a left-side bottom-illuminating low-energy X-ray source, corresponding to the left The third detector of the low-energy X-ray source, the high-energy X-ray source on the left bottom, and the fourth detector corresponding to the high-energy X-ray source on the left; The positions of the X-ray source, the low-energy X-ray source on the left side, and the high-energy X-ray source on the left side are respectively equipped with collimators that form the X-ray beam into a thin fan-shaped beam.

In addition, the first detector and the second detector are detectors with two different energy spectral responses of low energy and high energy, and the first detector, the second detector, the third detector, and the fourth detector are all An L-shaped detector is used, wherein the third detector is an L-shaped low-energy detector, and the fourth detector is a high-energy detector.

When the real dual-energy multi-view X-ray automatic detection device for explosives in luggage is started, the conveyor sends the luggage into the conveying channel, and the multi-view X-ray of the detection device is used for transmission scanning of the luggage , when the signals received by the first detector, the second detector, the third detector and the fourth detector are processed by the system control and signal processing circuit unit and sent to the integrated processing computer, and then the integrated processing computer Automatically detect the explosives in the luggage, and display the detection results on the display of the integrated processing computer.

The multi-view X-ray luggage automatic detection device for explosives with real dual energy of the present invention has the following advantages:

1) It can automatically detect explosives in luggage through two-dimensional features of material and density, with high detection accuracy;

2) The detection speed is fast, and 1800 packages can be detected per hour;

3) With high detection sensitivity and strong anti-interference ability, it is suitable for security inspection systems in important places such as civil aviation, railways, and customs.

Description of drawings

Fig. 1 is a structural schematic diagram of a multi-view X-ray automatic detection device for luggage explosives with real dual energy according to the present invention;

Fig. 2 is a schematic diagram of the front view of the conveying channel and the position of the radiation source in the multi-view X-ray automatic detection device for luggage explosives with real dual energy according to the present invention;

Fig. 3 is a top view schematic diagram of the conveying channel and the position of the detector in the multi-view X-ray automatic detection device for luggage explosives with real dual energy according to the present invention;

Fig. 4 is a schematic side view of the conveying channel, the radiation source and the position of the detector in the multi-view X-ray automatic detection device for luggage and explosives with real dual energy according to the present invention;

Fig. 5 is a working flow diagram of the automatic detection device for multi-view X-ray luggage explosives with real dual energy according to the present invention;

Fig. 6 is a schematic diagram of a quasi-dual-energy X-ray energy spectrum;

Fig. 7 is a schematic diagram of a real dual-energy X-ray energy spectrum.

Detailed ways

The real dual-energy multi-view X-ray automatic detection device for explosives in baggage of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the detection unit of the multi-view X-ray luggage automatic detection device with real dual energy according to the present invention includes a left top-view angle module, a right bottom-view The camera module and the left bottom camera camera module. The real dual-energy multi-view X-ray automatic detection device for luggage explosives also includes a system control and signal processing circuit unit 8 , a comprehensive processing computer 9 , a conveyor 12 and a conveying channel 7 .

See Fig. 2, Fig. 3 and Fig. 4, the left top-illuminated X-ray source 1, the right bottom-illuminated X-ray source 4, the left bottom-irradiated The high-energy X-ray source 10 and the left bottom-illuminated low-energy X-ray source 11 are respectively located in different orientations of the conveying channel 7, that is, in the front view direction of the conveying channel 7, the left top-illuminated X-ray source 1 is set At the top position on the left side of the conveying channel 7, the right bottom-illuminated X-ray source 4 is arranged on the right side of the bottom of the conveying channel 7, the left bottom-illuminated high-energy X-ray source 10 and the left bottom-illuminated low-energy X-ray source 4 The source 11 is arranged on the bottom left side of the delivery channel 7 .

Similarly, corresponding to the above-mentioned left top-illuminated X-ray source 1, right bottom-illuminated X-ray source 4, left bottom-illuminated high-energy X-ray source 10, and left bottom-illuminated low-energy X-ray source 11, the corresponding L-shaped first A detector 2 , a second detector 3 , a fourth detector 5 , and a third detector 6 are also attached to different positions of the delivery channel 7 .

In addition, relative to the above-mentioned left top-illuminated X-ray source 1, right bottom-illuminated X-ray source 4, left bottom-illuminated high-energy X-ray source 10, and left bottom-illuminated low-energy X-ray source 11, and for the convenience of each X-ray The X-ray beam emitted by the source can form a thin fan beam, and a collimator is arranged at each X-ray source position.

Among them, the left top-illuminated X-ray source 1 corresponds to the first detector 2 and forms a left-side top-illuminated viewing angle module, and the right bottom-illuminated X-ray source 4 corresponds to the second detector 3, and is in the transport channel 7 In the front view direction, they respectively form the left top viewing angle V1 and the right bottom viewing angle V2, and in the detection method, the V1 viewing angle and the V2 viewing angle use the dual-energy X-ray detection method of one source and two detectors; while the left bottom viewing angle The high-energy X-ray source 10 and the left bottom-illuminated low-energy X-ray source 11 correspond to the fourth detector 5 and the third detector 6, and together form the left bottom-illumination angle of view V3, the V3 angle of view utilizes two ray sources and the third detector 6. Two detectors, thus forming a real dual-energy X-ray detection method.

As shown in FIG. 5 , in application, the luggage 13 to be inspected is first placed on the conveyor 12, and when the automatic detection device is activated, the conveyor 12 moves at a constant speed to transport the luggage 13 to the conveying channel 7, and the luggage 13 Respectively trigger the left bottom-illuminated low-energy X-ray source 11, the left bottom-illuminated high-energy X-ray source 10, the right bottom-illuminated X-ray source 4, and the left top-illuminated X-ray source 1. Each ray source successively emits X-ray beams, X The ray beam becomes a thin fan-shaped beam after passing through the collimator located in front of the ray source, and transmits the checked baggage 13, and the third detector 6, the fourth detector 5, the second detector 3 and the first detector 2 respectively receive corresponding The attenuated signal transmitted through the baggage 13 is sent to the system control and signal processing circuit unit 8 for analog-to-digital conversion and signal correction processing, thereby forming corresponding projection image signals of V3, V2 and V1 angles of view, and then, the formed The projected image signal is sent to the comprehensive processing computer 9, and the automatic detection of explosives is performed in the comprehensive processing computer 9 and the detection result is displayed.

In addition, since the dual-energy X-ray detection method can be used to discriminate the material properties of the inspected object, in the present invention, a single X-ray source is used for both the V1 viewing angle and the V2 viewing angle, and X-rays with a continuous energy spectrum are emitted; The first detector 2 and the second detector 3 are placed in an overlapping manner, that is, the first detector 2 and the second detector 3 are two different energy spectral responses with low energy in front and high energy in the rear For this reason, it can obtain low-energy transmission signals and high-energy transmission signals respectively; and then perform material property discrimination on objects in the checked luggage 13. This detection method can also be called standard or conventional dual-energy X-ray inspection. , the dual-energy X-rays in this detection mode can also be called quasi-dual-energy X-rays generally, and the energy spectra of the quasi-dual-energy X-rays are overlapping, as shown in FIG. 6 .

For the V3 viewing angle in the present invention, it adopts the real dual-energy X-ray detection method to discriminate the material properties of the objects in the checked luggage 13, and this kind of real dual-energy X-ray inspection adopts dual-source and double-detection methods. The configuration is shown in Fig. 1, Fig. 4, Fig. 5 and Fig. 7. The low-energy X-ray source 11 on the left side is filtered by low-energy X-rays, and a narrow-band low-energy X-ray transmission signal is generated on the third detector 6, and the high-energy X-ray source 11 is illuminated on the left side. The X-ray source 10 is filtered by high-energy X-rays, and generates a narrow-band high-energy X-ray transmission signal on the fourth detector 5, which is compared with the quasi-dual-energy X-ray inspection method in the form of one source and two detectors used in the V1 viewing angle and the V2 viewing angle. The energy spectra of real dual-energy X-rays are almost non-overlapping, and the material resolution ability is strong.

Referring to Fig. 1, Fig. 3, Fig. 4 and Fig. 5, after the conveyor 12 sends the luggage 13 into the conveying channel 7, the luggage 13 sequentially passes through the low-energy X-ray source 11 on the left side according to the distribution of the radiation source and the detector. And the third detector 6, the left bottom illuminates the high-energy X-ray source 10 and the fourth detector 5, the right bottom illuminates the X-ray source 4 and the second detector 3, the left top illuminates the X-ray source 1 and the first detector Device 2.

Claims (5)

1. multi-view X ray luggage explosive substance automatic detection device with real dual-energy, it is characterized in that, comprise system's control and signal processing circuit unit, with system control and signal processing circuit unit carry out data transmission the overall treatment computing machine, be controlled by probe unit, conveyor and the transfer passage of system's control and signal processing circuit unit; Wherein, described probe unit is for being installed in the transfer passage, and comprise the top, left side of adopting a source two to visit the double energy X-ray detection modes visit at the bottom of the right side of double energy X-ray detection modes according to the visual angle module according to visual angle module, the source two of adopting and at the bottom of adopting the left side of real dual-energy X ray detection mode according to the visual angle module; Top, described left side comprises that according to the visual angle module top, left side is according to the x-ray source and first detector; Shine at the bottom of the described right side and shine the x-ray source and second detector at the bottom of the visual angle module comprises the right side; At the bottom of the described left side according to the visual angle module comprise the end, left side according to the low energy X ray source, to should the end, left side according at the bottom of the 3rd detector in low energy X ray source, the left side according to the sigmatron source and to should the end, left side according to the 4th detector in sigmatron source; And be provided with the collimating apparatus that X-ray beam is formed thin fan beam respectively according to place, sigmatron source position at the bottom of shining low energy X ray source and left side at the bottom of at the bottom of top, described left side is according to x-ray source, right side, shining x-ray source, left side.

2. according to the described multi-view X ray luggage explosive substance automatic detection device of claim 1, it is characterized in that described first detector is the detector with low energy and two kinds of different power spectrum responses of high energy with second detector with real dual-energy.

3. according to the described multi-view X ray luggage explosive substance automatic detection device of claim 1, it is characterized in that described first detector, second detector, the 3rd detector and the 4th detector are L type detector with real dual-energy.

4. according to the described multi-view X ray luggage explosive substance automatic detection device of claim 1, it is characterized in that described the 3rd detector is a L type low energy detector with real dual-energy.

5. according to the described multi-view X ray luggage explosive substance automatic detection device of claim 1, it is characterized in that described the 4th detector is a L type high energy detector with real dual-energy.

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