RU157515U1 - INSTALLATION X-RAY MULTI-PROJECTIVE FOR SURVEILLANCE OF GOODS AND HANDBAG - Google Patents

Abstract

Multiprojection x-ray apparatus for cargo and hand luggage inspection, containing a container closed by a casing with radiation protection elements, in which a multiprojection x-ray emitter is mounted, connected to a high-frequency low-power x-ray generator, connected to a programmable control unit equipped with a computer, a control panel and a video monitor, and optically coupled to a multi-element linear x-ray detector connected to a digital electronic conversion system traction and image formation connected to the programmable control unit; the container has an input and output windows through which a tunnel with X-ray transparent walls is laid, at the base of which a conveyor belt for inspection cargo passes, characterized in that at least four x-ray emitters are fixed in the container, the emission centers of which are in the same plane passing through a multi-element linear an x-ray detector perpendicular to the conveyor belt, wherein each emitter is equipped with a slotted collimator forming a narrow fan-shaped x-ray beam, optically mating angle with a multi-element linear x-ray detector, the angle between the central rays of the extreme emitters is 90 ° (± 1 °), and the programmable control unit provides alternate operation of the emitters in a pulsed mode with a pulse duration of at most s - the pixel width of a multi-element linear detector, ν - speed conveyor belts, n is the number of emitters, in addition, the computer is supplemented by a scheme for determining the effective atomic number

Description

The inventive object relates to the section of x-ray technology, more specifically to devices for non-destructive testing of baggage and cargo, and can be used in anti-terrorism screening in vehicles and at security checkpoints for various purposes.

A known two-projection x-ray apparatus for searching cargo and hand luggage, comprising a container closed by a casing with radiation protection elements, in which two x-ray emitters are mounted, each of which contains an x-ray tube and a slot-type diaphragm, which runs perpendicular to the direction of movement of the cargo being inspected and forms a fan x-ray beam, emitters connected to a high-frequency low-power x-ray generator and a programmable control unit equipped with a computer, a control panel, two video monitors protected by a vandal-proof shutter, and are optically coupled to two multi-element semiconductor detectors connected to a digital electronic conversion, registration and imaging system connected to a programmable control unit; the container has an entrance and exit window through which a tunnel with radiolucent walls is laid, at the base of which a conveyor belt for inspection cargo passes (Utility Model Patent No. 136667 of July 23, 2013 [1]).

The analogue [1] does not allow to obtain multiplicative and stereoscopic images, providing the possibility of a more detailed identification of the internal content of the inspection cargo, which is its drawback.

Known five-angle x-ray installation for baggage inspection Hi Scan 6040aTiX, Germany (http://intro-scope.ru/catalog/his_Oat [2]), containing five x-ray emitters, a container for the cargo and five x-ray image receivers. The well-known x-ray apparatus [2] sequentially scans an object with five independent beams with a projection of images from five angles onto five linear detectors. The disadvantages of this design are:

- increased dose of radiation to the scanned object (about 10 μSv);

- large overall length of the inspection tunnel and the installation as a whole;

- high price due to the presence of five emitters and five linear detectors.

The closest in design to the claimed object is a tomographic x-ray unit for cargo inspection and hand luggage Rapiscan RTT, USA (rapiscansystems.com [3]). It contains a container, closed by a casing with radiation protection elements, in which one x-ray emitter is mounted, moving in a circle, connected to a high-frequency low-power x-ray generator and a programmable control unit equipped with a computer, a control panel and a video monitor, and optically paired with one linear multi-element a detector connected to a digital electronic conversion, registration and imaging system connected to a programmable control unit . The container has an input and output windows through which a tunnel with X-ray transparent walls is laid, at the base of which a conveyor belt for inspection cargo passes. The analogue [3] was chosen by us as a prototype.

Analogue [3] has the following disadvantages:

1) a high dose received by the control object during the scan;

2) large mass-dimensional parameters of the installation make it difficult to deliver and place it in the inspection areas of transport enterprises;

3) the high cost of the installation itself and its maintenance;

4) low speed of analysis of one subject - about 13 seconds.

The aim of this work is to create a multi-projection X-ray unit for cargo inspection and hand luggage, providing high-information images about the contents of the inspection cargo, providing control at low radiation exposure, relatively low cost, facilitating the delivery of the installation to the inspection areas.

The technical result of the claimed utility model is expressed in expanding the arsenal of technical means for non-destructive testing of baggage and cargo by creating a facility that provides an increase in the information content of the internal contents of the controlled cargo due to stereoscopic and multiplicative images of baggage.

This technical result is achieved by the fact that in the installation of an x-ray multiprojection for cargo inspection and hand luggage, containing a container closed by a casing with radiation protection elements, in which a multiprojection x-ray emitter is connected, connected to a high-frequency low-power x-ray generator connected to a programmable control unit, equipped with a computer, a control panel and a video monitor and optically coupled to a multi-element linear detector connected to a digital electric a real system of conversion, registration and image formation connected to a programmable control unit; the container has an input and output windows through which a tunnel with X-ray transparent walls is laid, at the base of which a conveyor belt for inspection cargo passes, at least four x-ray emitters are fixed in the container, the emission centers of which are in the same plane passing through a multi-element linear detector, perpendicular to the tape conveyor, with each emitter equipped with a slit collimator, forming a narrow fan x-ray, optically coupled to a multi-element linear det In addition, the angle between the central beams of the extreme emitters is 90 ° (± 1 °), and the programmable control unit provides alternate operation of the emitters in a pulsed mode with a pulse duration of not more than Δt = s / νn, where s is the pixel width of a multi-element linear detector, ν - conveyor belt speed, n is the number of emitters, in addition, the computer is supplemented with a scheme for determining the effective atomic number, density and mass of inspected objects with digital image encoding.

Further description is accompanied by drawings and explanations to them. In FIG. 1 shows the inventive installation for the inspection of goods and hand luggage (top view), FIG. 2 is a section AA of FIG. 1, in FIG. 3 is an electrical block diagram of the installation, in FIG. 4 shows a photo of a prototype installation of a multi-projection cargo inspector and hand luggage “Inspector 60/40 3D”.

Multiprojection x-ray unit for cargo and hand baggage inspection contains an x-ray protective container 1 with input 2 and output 3 windows through which a tunnel 4 is laid, at the base of which there is a belt 5 of the conveyor 6 for inspected goods 7. The movement of the belt 5 is carried out by a reversible type electric motor. The walls of the tunnel 4 have an X-ray protective coating and a narrow transverse slot 8, which is essentially a slit collimator for the passage of fan X-ray beams A, B, C, D from X-ray emitters 9 _A , 9 _B , 9 _C , 9 _D , which are optically coupled to a multi-element linear an X-ray detector 10, for example a semiconductor type. In this case, the emission centers o _A , o _B , o _C , o _D , (actual focus of the x-ray tubes) of the x-ray emitters 9 _A , 9 _B , 9 _C , 9 _D are in the same plane passing through the multi-element linear x-ray detector 10, perpendicularly belt 5 of conveyor 6. At least four x-ray emitters 9 _A , 9 _B , 9 _C , 9 _{D are used} ; the angle between the central beams of the extreme emitters 9 _A and 9 _D is 90 ° (± 1 °). X-ray emitters 9 _A , 9 _B , 9 _C , 9 _{D are} connected respectively to generators 11 _A , 11 _B , 11 _C , 11 _{D of} high-frequency type of low power, which are connected to a programmable control unit 12 equipped with a computer. The control unit 12 turns on each of the x-ray emitters in turn for a short time in a pulsed mode with a pulse duration of not more than Δt = s / νn, where s is the pixel width of a multi-element linear detector, ν is the conveyor belt speed, n is the number of emitters. The control unit 12 is connected to the video monitor 13. The control panel 14, which is used as a keyboard, is designed to turn on the control unit 12, set a specific function for processing the obtained x-ray images, turn the conveyor motor 6 on and off. The electric signal from the multi-element linear x-ray detector 10 passes an amplifier 15, the analog-to-digital Converter 16 and enters the control unit 12, where it is processed according to the appropriate program, resulting in forms a digital image matrix of the controlled object is displayed, which is displayed on the screen of the video monitor 13 for viewing and analysis. Viewing the image of the controlled object 7 can be carried out in three modes: standard using direct and side projections (images from emitters 9 _D and 9 _A ), stereoscopic using a stereo pair of images received from emitters 9 _A and 9 _B ; 9 _B and 9 _C ; 9 _C and 9 _D (for stereoscopic analysis a special stereoscope can be used, for example, Stumpf’s stereo binoculars), and in the multiplication mode (alternately dynamically viewing images from emitters 9 _A , 9 _B , 9 _C , 9 _D ).

The computer included in the programmable control unit 12, supplemented by a circuit for determining the density of inspected goods.

In FIG. Figure 4 shows a photo of a prototype X-ray multiprojection unit for cargo inspection and hand luggage “Inspector 60/40 3D”. The prototype has the following main technical characteristics: tunnel size (mm) 610 (width) × 410 (height), conveyor speed 0.2 m / s, penetration, not less than 30 mm Fe, contrast sensitivity 0.08 mm Cu wire, scanning dose 0.75 μSv, conveyor height 820 mm, maximum load capacity 150 kg, overall dimensions (mm) 2200 × 1680 × 1650, weight 610 kg, mains supply 220 V, 50 Hz, 850 W, detection and display functions: definition density and eff atomic number of substances, the output of 3D images of objects.

Some explanations for the utility model formula.

1. The angle between the central rays of the extreme emitters is 90 ° (± 1 °). This arrangement of the extreme emitters is dictated by the need to view the image of the controlled object in the front and side projections.

2. At least four x-ray emitters are fixed in the container. With a smaller number of emitters (three), the convergence angle between the central rays of these emitters is more than 30 °, which makes it difficult to view the image in animated mode.

3. A pulse duration of not more than Δt = s / νn is necessary to ensure the geometric identity of images in multi-projection radiography.

Claims (1)

Multiprojection X-ray unit for cargo and hand luggage inspection, containing a container closed by a casing with radiation protection elements, in which a multiprojection X-ray emitter is attached, connected to a high-frequency low-power X-ray generator, connected to a programmable control unit equipped with a computer, a control panel and a video monitor, and optically coupled to a multi-element linear x-ray detector connected to a digital electronic conversion system traction and image formation connected to the programmable control unit; the container has an input and output windows through which a tunnel with X-ray transparent walls is laid, at the base of which a conveyor belt for inspection cargo passes, characterized in that at least four x-ray emitters are fixed in the container, the emission centers of which are in the same plane passing through a multi-element linear X-ray detector, perpendicular to the conveyor belt, with each emitter equipped with a slotted collimator, forming a narrow fan-shaped x-ray, optically mating angle with a multi-element linear x-ray detector, the angle between the central rays of the extreme emitters is 90 ° (± 1 °), and the programmable control unit provides alternate operation of the emitters in a pulsed mode with a pulse duration of not more than

where s is the pixel width of a multi-element linear detector, ν is the conveyor belt speed, n is the number of emitters, in addition, the computer is supplemented with a scheme for determining the effective atomic number, density and mass of inspected objects with digital image encoding.

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