CN100594376C - Portable Dual Energy X-ray Inspection Device - Google Patents

Abstract

The portable double energy X-ray inspection device includes X-ray source carrying case, projecting camera obscura carrying case and controller carrying case. The filtering board inside the X-ray source carrying case is first controlled in the energy I position, the computer obtains the transmission image of the detected object and treats the transmission images in different greys by means of the FISCAN software package for the inspector to judge primarily. The filtering board is then set in the energy II position to obtain the new transmission image of the detected object, and the computer analyzes and treats these two digital images, calculates the equivalent atom sequence numbers of the object to distinguish organic matter, inorganic matter and mixture and displays in different colors.

Description

Portable Dual Energy X-ray Inspection Device

technical field

The invention relates to social public security inspection equipment, in particular to a portable dual-energy X-ray inspection device.

Background technique

Portable X-ray inspection devices are mainly used in public places such as customs and airports to inspect metal weapons, explosives, drugs and other contraband hidden in luggage and parcels.

All kinds of portable X-ray inspection devices currently available generally use traditional X-ray imaging technology to identify the gray level and graphic outline of the transmission image of the inspected item. Overlaid perspective images of various items in the photo path.

For metal contraband such as guns and knives hidden in clothing and books, due to their density is much higher than that of clothing and books, and they have obvious shapes, traditional X-ray imaging technology can show more gray particles. degree of hierarchy and obvious outlines, making it easier to identify. For organic substances such as explosives or drugs, due to their low density and small attenuation of X-rays, more gray levels cannot be displayed; and explosives or drugs have no specific shape characteristics, so it is difficult to distinguish them.

Contents of the invention

The invention overcomes the shortcomings of the prior art and provides a portable dual-energy X-ray inspection device that can clearly distinguish organic substances such as explosives or drugs.

The invention adopts the surface detector imaging method and the double exposure mode, and obtains two kinds of X-rays with different energies by using a filter plate switching device at the ray outlet. After the perspective image is processed by software in the computer, the inorganic and organic substances will be displayed in different colors, so as to achieve the purpose of distinguishing explosives or drugs.

The invention includes an X-ray source carrying case, a projection dark box carrying case and a controller carrying case. The X-ray source carrying case includes an X-ray generator and a micro-motor, and a radiation filter plate and a filter plate switching device are installed at the X-ray source ray outlet on the case body of the carrying case, and the micro-motor drives the filter The plate switching device is used to switch the ray filter plate, so as to obtain two kinds of X-rays with different energies.

The carrying case of the projection obscura includes a fluorescent detector, a digital camera, a mirror, a fluorescent screen, a fluorescent screen support body and an acquisition control module. The fluorescent screen support body is fixed on the inner side wall of the projection dark box carrying case, and a fluorescent screen is bonded on the fluorescent screen support body; there is a reflector at a certain angle with the fluorescent screen in the casing of the projection dark box carrying case, and the reflective The mirror is a reflective mirror with aluminized film on the surface, and its reflective surface is in the direction of the fluorescent screen. A digital camera and a fluorescent detector are installed on the top wall of the box above the reflective surface of the reflective mirror. The angle formed by the reflective mirror and the fluorescent screen is such that the fluorescent screen The fluorescent image of the detected object presented on the mirror is reflected on the reflective surface of the mirror and then injected into the digital camera and the fluorescent detector; the acquisition control module is composed of image acquisition, fast Ethernet interface and system control. A software and hardware system with an embedded microcontroller as the core, on the one hand, under the control of the system control part, the image acquisition part acquires image information from the digital camera, transmits it to the transmission module through the fast Ethernet interface, and then transmits it to the computer through the transmission module ; On the other hand, the system control receives the control command of the computer, transmits the control command to the micromotor in the X-ray source carrying box through the transmission module, and the filter plate switching device is driven by the micromotor to adjust the position of the filter plate.

There is a transmission module and a computer in the carrying case of the controller. The transmission module is composed of image data transmission and ray source control command transmission. The image data transmission part includes a fast Ethernet interface, a wireless Ethernet access device and a wireless Ethernet network card; the image data transmission part will be transmitted from the acquisition control module The acquired image information is transmitted to the computer in a wireless or wired manner. The radiation source control command transmission part includes a control command encoder, a control command transmitter, a control command receiver and a control command decoder. The control signal sent by the computer is transmitted to the acquisition control module through the transmission module, and then the acquisition control module sends a control signal to the micro-motor. This signal is encoded by the encoder, transmitted by the transmitter, received by the receiver, and then decoded by the decoder. Finally control the micro-motor to drive the filter plate switching device. The computer mainly completes system control, material analysis, image processing, display, storage and retrieval through the FISCAN composite algorithm software package.

The invention is small in size, easy to carry and transport, flexible and convenient to operate, and can effectively identify organic substances such as explosives or drugs.

Description of drawings

Fig. 1 is a working principle diagram of the present invention;

Fig. 2 is a schematic structural view of the projection obscura carrying case of the present invention;

Fig. 3 is the acquisition control module structural schematic diagram of the present invention;

Fig. 4 is a structural schematic diagram of the transmission module of the present invention;

Fig. 5 is a schematic structural diagram of the X-ray source carrying case of the present invention.

In the picture:

1-X-ray source carrying case, 2-object to be detected, 3-projection obscura carrying case,

4-controller carrying case, 5-transmission module, 6-computer, 7-projection obscura carrying case,

8-digital camera, 9-fluorescent detector, 10-fluorescent screen support, 11-fluorescent screen,

12-mirror, 13-acquisition control module, 14-image acquisition, 15-fast ethernet interface,

16-system control, 17-wireless Ethernet access device, 18-wireless Ethernet network card,

19-control command encoder, 20-control command transmitter, 21-control command receiver,

22-control command decoder, 23-X-ray generator, 24-ray filter plate,

25-filter plate switching device, 26-micro motor.

Detailed ways

Now in conjunction with the accompanying drawings, the structure and working principle of the present invention will be further described:

As shown in accompanying drawings 1, 2, 3 and 4, the present invention includes an X-ray source carrying case 1, a projection obscura carrying case 3 and a controller carrying case 4.

The X-ray source carrying case 1 includes an X-ray generator 23, a micro-motor 26, and a radiation filter plate 24 and a filter plate switching device are installed at the X-ray source ray outlet on the body of the X-ray source carrying case 1 25. The micro-motor 26 drives the filter plate switching device 25 to switch the radiation filter plate 24, so as to obtain X-rays with two different energies. The X-ray source can be selected to work in a continuous mode or in a pulse mode. There is no strict requirement on the peak voltage of the X-ray source, so it can be flexibly selected according to user needs and the nature of the inspected items. .

The carrying case 3 of the projection obscura includes a fluorescent detector 9 , a digital camera 8 , a mirror 12 , a fluorescent screen 11 , a fluorescent screen support 10 and an acquisition control module 13 . The inner wall of the projection dark box carrying case 3 is processed to be blackened and matted to prevent the penetration of visible light. The fluorescent screen support body 10 is fixed on the inner side wall of the projection dark box carrying case 3 , and the fluorescent screen support body 10 is bonded with a fluorescent screen 11 . The fluorescent screen 11 is a scintillator fluorescent screen, which matches the spectrum of the digital camera, and has high conversion efficiency of visible light under the condition of ensuring high resolution. There is a reflector 12 which forms a certain angle with the fluorescent screen 11 in the casing of the projection dark box carrying case 3. The reflective mirror 12 is a surface aluminized film reflector, and its reflective surface is in the direction of the fluorescent screen. Its function is to reduce the size of the projection dark box. Carry the thickness of the case body 7, and make the digital camera 8 move out of the ray irradiation field. A digital camera 8 and a fluorescent detector 9 are installed on the top wall of the casing 7 above the reflective surface of the reflective mirror 12, and the angle formed between the reflective mirror 12 and the fluorescent screen 11 is such that the fluorescent image of the detected object 2 presented on the fluorescent screen 11 can be displayed. After being reflected on the reflective surface of the mirror 12, it is injected into the digital camera 8. The fluorescent detector 9 mentioned here can also be installed behind the fluorescent screen 11, and only needs to avoid the imaging field of view of the digital camera 8. The digital camera 8 uses CCD as the photosensitive device, which can change the light sensitivity of the camera by changing the resolution according to the energy of X-rays. Its shell is covered with a lead shielding layer to prevent the influence of stray radiation on the CCD device. Pixel-level zoom wide-angle industrial lens. Fluorescent screen 11, mirror 12, and digital camera 8 constitute an X-ray to visible light image conversion system. Fluorescence detector 9 is composed of high-sensitivity, fast-response photosensitive device, signal amplification circuit and light-gathering components. It detects the visible light emitted by fluorescent screen 12 and outputs digital signals. Its rising and falling edges determine the starting moment of image acquisition by digital camera 8. and stop time, so that the accumulation time of the digital camera 8 can be automatically controlled according to the change of the brightness of the fluorescent screen 11, and the X-ray generator is not required to output the accumulation control signal for the digital camera. Described acquisition control module 13 is made up of image acquisition 14, Fast Ethernet interface 15 and system control 16 three parts, is a hardware and software system with embedded micro-controller as the core, under the control of system control 16 image acquisition 14 from The digital camera 8 obtains the image information, transmits it to the transmission module 5 through the fast Ethernet interface 15, and then transmits it to the computer 6; and can receive the control command of the computer 6 transmitted by the transmission module 5 to control the micromotor 26 to drive the filter The plate switching device 25 is used to adjust the filter plate 24 position.

The controller carrying case 4 contains a transmission module 5 and a computer 6 . Transmission module 5 is made up of image data transmission and ray source control order transmission two parts, and described image data transmission part comprises Fast Ethernet interface 15, wireless Ethernet access device 17 and wireless Ethernet network card 18; Image data transmission part will The image information acquired from the acquisition control module 13 is transmitted to the computer 6 in a wireless or wired manner. The radiation source control command transmission includes a control command encoder 19 , a control command transmitter 20 , a control command receiver 21 and a control command decoder 22 . The control signal sent by the computer 6 is transmitted to the acquisition control module 13 through the transmission module 5, and the acquisition control module 13 sends a control signal to the micro-motor 26. This signal is encoded by the encoder 19, transmitted by the transmitter 20, and received by the receiver 21. After being decoded by the decoder 22, the micro-motor 26 is finally controlled to drive the filter plate switching device 25.

The working principle of the present invention is as follows: first, computer 6 transmits order to collection control module 13 by transmission module 5, and the system control 16 in the collection control module 13 controls the micromotor 26 in the X-ray source carrying case 1 to drive the filter plate switch The device 25 places the filter plate 24 at the energy "-" position, and at the same time, the computer 6 controls the X-ray generator 23 to expose according to the preset exposure amount, and the X-ray penetrates the object 2 to be detected, and the detected object 2 appears on the fluorescent screen 11. The fluorescent image of the object 2 is detected, and the fluorescent image is detected by the fluorescent detector 9 after being reflected by the mirror 12, thereby starting the digital camera 8 to collect the fluorescent image. After the exposure is completed, the digital camera 8 transmits the digital image to the transmission module 5 through the acquisition control module 13, and then transmits it to the computer 6. The computer 6 processes and displays the perspective images of different gray levels of the detected object 2 according to the FISCAN special software package. For the examiner's preliminary judgment.

Then, under the control of the computer 6, the micro-motor 26 drives the filter plate switching device 25 to place the filter plate 24 in the energy "two" position, without changing the X-ray source carrying case 1, the projection obscura carrying case 3 and the detected The position of the object 2, and keep the same exposure, exposure again, and finally get a new perspective image of the detected object 2 on the computer 6, the material analysis software of the FISCAN special software package in the computer 6 analyzes the above two consecutive images Digital images are used for material analysis and processing to calculate the equivalent atomic number of various items, thereby distinguishing organic matter, inorganic matter and mixtures, and giving different colors when displayed. Generally, if the equivalent atomic number is less than 10, the material is classified as an organic substance, which is displayed in orange; if the equivalent atomic number is 10 to 17, the material is classified as a mixture, which is displayed in green; if the equivalent atomic number is greater than 17, the material is classified as inorganic and displayed in blue; objects that are too thick or too dense are displayed in red because they cannot be penetrated by X-rays. It can be seen that when the image in the computer is displayed in orange, special attention should be given, because most of the explosives and drugs are organic substances.

Claims (5)

1. portable double energy X-ray detector, comprise that x-ray source carries case (1), the projection camera bellows carries case (3) and controller carries case (4), it is characterized in that described x-ray source carries comprises x ray generator (23) in the case (1), micromotor (26) carries at x-ray source that x-ray source ray exit is equipped with ray filtering plate (24) and filtering plate switching device shifter (25) on the casing of case (1);

Described projection camera bellows carries and comprises fluorescent probe (9) in the case (3), digital camera (8), reflective mirror (12), video screen (11), video screen supporter (10) and acquisition control module (13); Described video screen supporter (10) is fixed on the box inside wall that the projection camera bellows carries case (3), is bonded with video screen (11) on video screen supporter (10); In the projection camera bellows carries the casing of case (3), have one with the angled reflective mirror (12) of video screen (11), its reflective surface position is the video screen direction; On casing (7) roof above the reflective surface of reflective mirror (12), digital camera (8) and fluorescent probe (9) are installed; Described acquisition control module (13) is by image acquisition (14), fastethernet interface (15) and system's control (16) three parts are formed, gather (14) at the control hypograph of system's control (16) and obtain image information from digital camera (8), be sent to transport module (5) by fastethernet interface (15), be sent to computing machine (6) again; And can receive the control command of the computing machine (6) that sends by transport module (5), control micromotor (26) driving filtering plate switching device shifter (25) and regulate filtering plate (24) position;

Described controller carries transport module (5) and computing machine (6) in the case (4); Transport module (5) is made up of image data transmission and radiographic source control command transmission two parts, and described image data transmission partly comprises fastethernet interface (15), wireless ethernet access device (17) and wireless ethernet network interface card (18); The image data transmission part will be sent to computing machine (6) in wireless or wired mode from the image information that acquisition control module (13) obtain; Described radiographic source control command transmission comprises control command scrambler (19), control command transmitter (20), control command receiver (21) and control command code translator (22); The control signal that computing machine (6) sends is sent to acquisition control module (13) through transport module (5), acquisition control module (13) is sent control signal to micromotor (26) again, the encoded device of this signal (19) coding, launch by transmitter (20), receive by receiver (21), pass through code translator (22) decoding again, finally control micromotor (26) and drive filtering plate switching device shifter (25)

Wherein, described reflective mirror (12) is injected in the digital camera (8) after the fluoroscopic image that is detected object (2) that presents on the video screen (11) can being reflected on the reflective surface of reflective mirror (12) with video screen (11) angulation.

2. a kind of portable double energy X-ray detector as claimed in claim 1 is characterized in that the inwall that described projection camera bellows carries case (3) is processed into the blackout delustring.

3. a kind of portable double energy X-ray detector as claimed in claim 1 is characterized in that described reflective mirror (12) is surperficial aluminizer reflective mirror.

4. a kind of portable double energy X-ray detector as claimed in claim 1 is characterized in that digital camera (8) shell is surrounded by the lead shield layer.

5. a kind of portable double energy X-ray detector as claimed in claim 1 is characterized in that fluorescent probe (9) is installed on video screen (11) back, is positioned at outside digital camera (8) visual field.

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