KR101519713B1 - Electron accelerator having plural-Energy, cargo inspection device and control method using the same - Google Patents

Abstract

An electron accelerator using multiple energies, a cargo inspection apparatus and a control method thereof are presented. An electronic accelerator used in a cargo inspecting apparatus for performing an inspection through dual energy using an electron beam includes a power unit, a synchronization signal generator for generating a clock, an RF generator for generating an RF signal by the clock, And a chamber for providing a passage through which the electrons are moved, wherein the RF generator generates a first level RF signal and a second level signal in the same clock, And each of the electron beams generated by the RF signal of the second level of the low-level is oscillated. Accordingly, the accuracy of the search and the inspection can be maintained with a single energy irradiation, the search / inspection efficiency can be improved by shortening the search time, and the advantages can be maximized by using the dual energy. It is possible to precisely and promptly inspect the control technique without adding a device, and it is possible to drastically improve the throughput and inspection quality of the search and inspection without burdening the cost increase in production.

Description

TECHNICAL FIELD The present invention relates to an electron accelerator using multiple energies, a cargo inspecting apparatus and a control method thereof,

The present invention relates to an electron accelerator using a plurality of energies, a cargo inspecting apparatus and a control method thereof, more specifically, to a method of controlling a cargo inspecting apparatus and a control method thereof, in which the accuracy of search and inspection can be maintained with a single energy search, It is possible to maximize the advantage by using the dual energy, and it is possible to perform the precision and quick inspection by using the control technique without adding a separate device, To an electron accelerator using multiple energies capable of drastically improving the throughput and inspection quality of a search and inspection, a cargo inspection apparatus and a control method thereof.

In the case of facilities handling international cargoes such as ports and airports, the security search for cargo is being reinforced due to safety reasons. In recent years, advanced countries such as the United States have sought to search for various substances such as explosives as well as special nuclear materials, and to search delicately and accurately.

X-ray detection methods such as explosives are generally used. However, the inspection method using X-ray has a problem that the accuracy of the material type and identification of the cargo loaded in a predetermined storage means such as a container is low. In order to solve this problem, a conventional electronic accelerator for non-destructive testing and a security detector using dual energy have been developed. However, it is difficult to generate an X-ray using one input pulse energy at a constant driving frequency, Pulse energy is alternately applied to generate X-rays of two energies to perform inspection or search.

More specifically, in a conventional non-destructive testing electron accelerator, a double-energy-based security detector repeatedly generates high-level and low-level dual energies for a predetermined period of time and used for security search. However, there is a problem that it is difficult to search dual energy at the same position at a time with respect to passing objects to be searched. In order to compensate for this, there is a technique of raising the irradiation frequency or performing a dual energy irradiation by slowing down the speed of the object to be searched. However, there is a problem that the search time and the life time of the electron accelerator are shortened.

That is, it is urgent to develop an inspection system capable of inspecting and searching even when the subject moves fast, and maintaining accuracy and reliability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems,

An object of the present invention is to provide an electron accelerator using multiple energies that can be inspected / retrieved even when an object moves rapidly, a cargo inspecting apparatus and a control method thereof.

It is another object of the present invention to provide a method and apparatus for detecting energy using a plurality of energies capable of maximizing the advantage of dual energy by improving the efficiency of search / An electron accelerator, a cargo inspection apparatus and a control method thereof.

Another object of the present invention is to provide a method and apparatus for controlling the amount and quality of inspection and inspection which can be carried out without any additional burden on the production cost An electron accelerator using the multiple energy, a cargo inspecting apparatus and a control method thereof.

An electron accelerator used in a cargo inspecting apparatus for performing an inspection through dual energy using an electron beam according to the present invention includes a power unit, a synchronization signal generator for generating a clock, an RF signal generator for generating an RF signal by the clock, An RF generator, an electronic generator for generating electrons according to input information of the power source, and a chamber for providing a path through which the electrons are moved, wherein the RF generator generates a first level RF signal and a second level RF signal in the same clock, And each of the electron beams generated by the second level RF signal having a magnitude lower than the first level oscillates.

A signal generated in the power supply unit is simultaneously generated in conjunction with a signal of the RF generator and a signal generated in the power supply unit for the first level RF signal is smaller than a signal generated for the second level signal.

Electrons are emitted only when the propagation direction of the electrons generated by the electron generation unit and the traveling direction of the high frequency generated by the RF generation unit are the same.

In the multi-energy cargo inspecting apparatus having an electron accelerator for generating electrons, the electron accelerator has a first level signal and a second level signal smaller in level than the first level within the same clock provided for synchronization Wherein the cargo inspection apparatus further comprises a guide portion for guiding a beam by the electrons and a detector for detecting a signal passing through the inspection object.

A control method of an electronic accelerator used in a cargo inspecting apparatus for performing an inspection with dual energy using an electron beam, includes the steps of: providing a clock for synchronization; generating a first level signal and a second level signal for the one clock Generating a low-level second level signal, and generating the electron beam to correspond to the first and second levels, and simultaneously generating a power supply signal in cooperation with the first and second level signals, Wherein the power supply signal has a magnitude lower than that of the signal generated for the first level RF signal.

Accordingly, not only inspection / searching can be performed even when the subject moves fast, accuracy can be maintained by one energy irradiation, search time can be shortened, and search / inspection efficiency can be improved. It is possible to maximize its advantages and to improve precision and speedy inspection by using control technique without adding any additional equipment, thus dramatically improving inspection throughput and inspection quality without burdening cost increase in production .

According to the present invention, it is possible to perform precision and speed inspection by using a control technique without adding a separate device, and it is possible to improve the throughput and inspection quality of search and inspection without burdening the cost increase in production have.

In addition, it is possible to maintain accuracy with a single energy irradiation, to shorten the search time, and to improve the efficiency of search / inspection, thereby maximizing the advantage of using double energy.

1 is a configuration diagram of a cargo inspection apparatus according to the present invention.
2 is a detailed structure of the electron accelerator 10. Fig.
4 is a conventional electron accelerator control method.
4 is an electron accelerator control method according to the present invention.

Hereinafter, the present invention will be described in detail.

First, in the present specification, the term " inspection " refers to the meaning of the search, and the type of the built-in article is identified or judged. Cargo is any type of object provided with a case that can contain the goods. Also, the electron accelerator includes all kinds of devices or devices capable of accelerating the particles such as electrons.

1 is a configuration diagram of a cargo inspection apparatus according to the present invention.

As shown, the cargo inspection apparatus 1 includes an electron accelerator 10, a guide portion 20, and a detection portion 30.

For reference, the cargo inspection apparatus 1 described in the present invention is installed in a facility in which international cargoes such as ports and / or airports enter and exits, and cargo C is inspected. In this embodiment, as shown in Fig. 1, the cargo inspection apparatus 1 examines a cargo C in a predetermined object O such as a container.

The electron accelerator 10 accelerates electrons, which generate and accelerate a plurality of electron beams B having different energy magnitudes. Specifically, the electron accelerator 10 alternately generates at least one electron beam B having different energy magnitudes.

In the present embodiment, the electron accelerator 10 alternately generates electron beams B having energy of 6 MeV and 9 MeV. However, the present invention is not limited thereto, and the electron accelerator 10 may alternatively generate electron beams B having energy of 6 MeV, 9 MeV, and 15 MeV in order, alternately with energy of 6 MeV and 15 MeV, It is natural that the electron beam B can be changed in response to various conditions, such as alternately generating the electron beam B.

The guide unit 20 guides the electron beam B generated from the electron accelerator 10 and accelerated to the target object O. [ To this end, the guide unit 20 includes a conversion unit 21 and a collimator unit 22.

The conversion unit 21 converts the electron beam B accelerated by the electron accelerator 10 into an X-ray X and emits it. The conversion unit 21 includes a tungsten target formed of tungsten having high x-ray generation efficiency and long life.

The collimator unit 22 adjusts the direction of the X-rays X emitted from the conversion unit 21 and guides the X-rays to the object O. At this time, the collimator part 22 is provided with a slit 23 through which the X-ray X passes for guiding the X-ray X to be guided. At this time, the slit 23 of the collimator unit 22 faces the object O, and the X-ray X passing through the slit 23 is guided to the object O.

The detection unit 30 detects the X-ray X that has passed through the object O. Here, a plurality of detection units 30 are provided to three-dimensionally detect the cargo C inside the object O. In the present embodiment, as shown in Fig. 1, the detection units 30 are arranged in a pair in parallel with each other, but it is needless to say that the number of the detection units 30 is not limited as shown in Fig.

The inspection operation of the cargo inspection apparatus 1 according to the present invention having the above-described configuration will be described with reference to FIG.

As shown in FIG. 1, electron beam B having energy of 6 MeV and 9 MeV magnitude is alternately generated by electron electron accelerator 10 and accelerated to guide unit 20. The accelerated electron beam B is converted into an X-ray X through the conversion unit 21 of the guide unit 20 and then guided to the object O via the collimator unit 22. [ The X-rays X that have passed through the object O are detected by a plurality of detection units 30, that is, a pair of detection units 30. [

Here, the cargo C in the object O passes through the object O and is detected as the electron beam B having different energy magnitudes is alternately accelerated in the electron accelerator 10 The kind of the cargo C such as the metal C1 or the organic material C2 is inspected. In addition, as the X-ray X passing through the object O is detected by the pair of detecting portions 30, the perspective of the cargo C inside the object O can be obtained and a three-dimensional inspection can be performed.

2 is a detailed structure of the electron accelerator 10. Fig.

The electron accelerator 10 according to the embodiments of the present invention will be described in detail with reference to the drawings. The electron accelerator 10 includes a power supply unit 112, a synchronization signal generator 40, an RF generator 12, an RF transmitter 50, an electron generator 11, and a chamber 13. The RF generating unit 12 and the RF transmitting unit 50 may be integrally formed in a circuit.

The electron generating unit 11 generates the electrons e. The electron generating unit 11 includes a housing 113 for accommodating filaments 111 for generating electrons e and a power supply unit 112 for supplying power to the filaments 111.

The chamber 13 provides a space through which the electrons e generated in the electron generating portion 11 can travel.

The RF generating unit 12 generates a high frequency and supplies a high frequency to the electron generating unit 11 and the chamber 13, respectively. This allows the RF generating unit 12 to provide a high frequency to the electron generating unit 11 and the chamber 13 so that only when the electron generating unit 11 has the same direction of high frequency as the traveling direction of the electrons e, (e) is released. As a result, the electrons e are bunched and discharged at regular intervals.

The electrons e thus enter the chamber 13 in a tamped state. The high frequency generated by the RF generator 12 is also supplied to the RF generator 12 through the RF transmitter 50 through the RF generator 12 in the chamber 13, When the intensity of the generated high frequency is increased, the energy of the electrons e traveling in the chamber 13 also increases. This is because the electrons e advance in the chamber 13 while absorbing high frequency energy. That is, since the intensity of the high frequency power supplied to the RF generator 12 is adjusted in order to generate an electron beam having a desired energy, the energy of the electron beam can be easily adjusted.

There is an advantage that an electron beam of a desired energy can be easily obtained from one electron accelerator 10. In addition, according to the embodiments of the present invention, there is an advantage that electrons e can be obtained in the bunch state in the electron accelerator 10. [

The synchronization signal generator 40 controls the power supply unit 112 and the RF generator 12 to provide a predetermined period of clock. At this time, the RF generator 12 generates RF pulses from the RF driver and high frequency pulses from the modulator, and a high voltage signal is output from the power supply 112. FIG. 3 relates to a conventional electron accelerator control method. As shown in FIG. 3, a RF pulse is generated in a clock cycle in which a signal having a relatively high level and a signal having a low level are generated in different clock cycles, do. At this time, the high voltage signal is at a low level when the RF pulse is at a high level and at a high level when the RF pulse is at a low level.

That is, in the inspection of cargo and the like using dual energy, it causes the repetition rate of the inspection and the speed of the object to be searched to be slow, and it may be difficult to perform the security search itself, and the search time is increased.

To solve this, FIG. 4 is presented. 4 is an electron accelerator control method according to the present invention. As shown in the figure, the RF pulse is generated in the same clock cycle with respect to the signal having the relatively high level and the signal having the low level, and the RF pulse is irradiated with the electron beam to perform the security search. That is, the input power of high level and low level is simultaneously applied in the same pulse, so that the electron beam for the cargo color can be irradiated to almost the same position. At this time, when the pulse signal from the RF driver is a high level signal, the voltage signal from the power source unit corresponds to a low level signal, and when the pulse signal from the RF driver is a low level signal, The signal causes a high level signal to be generated correspondingly.
As shown in Fig. 4, the manner in which the high-level signal and the low-level signal are generated in the same clock cycle may be an RF pulse and an electron beam.
The RF input power applied from the RF driver is applied to the modulator simultaneously with the input power of high and low level according to the pulse width and the gap voltage of the electron beam is also applied to the high and low level in the electron beam power supply When the RF pulse signal from the RF generator is a high level signal, a voltage signal of a lower level than the RF pulse is correspondingly generated from the power source to the electron beam, and the RF pulse signal from the RF generator is low level Signal, the voltage signal may be configured to generate a signal of a higher level than the RF pulse to the electron beam from the power source section.

That is, in carrying out the cargo search, it is possible to perform the irradiation in a narrower range than the existing one, and it is advantageous in that even when the cargo moves quickly, the investigation can be performed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The present invention is not limited to the above-described embodiments, and various modifications and changes may be made thereto by those skilled in the art to which the present invention belongs. Therefore, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all of the equivalents or equivalents of the claims, as well as the following claims, are included in the scope of the present invention.

1: cargo inspection device 10: electron accelerator
11: Electronic generating unit 12: RF generating unit
20: Guide section 21: Conversion section
22: collimator unit 30: detection unit
40: Synchronization signal generator 50: RF transmission unit
111: filament 112:
113: Housing

Claims (8)

An electron accelerator for use in a cargo inspection apparatus for performing inspection through dual energy using an electron beam,
The electron accelerator
A power supply unit;
A synchronization signal generator for generating a clock;
And generates an RF pulse signal by the clock so that each of the electron beams generated by the first level RF signal and the second level RF signal having a magnitude lower than the first level oscillates within the same clock, An RF generator;
An electronic generator for generating electrons according to input information of the power supply unit; And
A chamber for providing a path through which the electrons travel;
Wherein when the RF pulse signal from the RF generator is a high level signal, an oscillation signal is generated from the power source to an electron beam, and a signal having a voltage level lower than that of the RF pulse signal is generated correspondingly, Wherein when the RF pulse signal from the RF generator is a low level signal, an oscillation signal is generated in the electron beam from the power supply unit, and a signal of a higher voltage level than the RF pulse signal is generated correspondingly.

The method according to claim 1,
Wherein the signal generated by the power supply unit is simultaneously generated by interlocking with the signal of the RF generator and the signal generated for the first level RF pulse signal at the power supply unit is lower than the signal generated for the second level RF pulse signal And a second electrode. The method according to claim 1,
And adjusts the frequency of the RF generator to adjust the energy of electrons traveling in the chamber. The method according to claim 1,
Wherein electrons are emitted only when the traveling direction of the electrons generated by the electron generation unit and the traveling direction of the high frequency generated by the RF generation unit are the same. An apparatus for inspecting cargo using multiple energies, comprising an electron accelerator for generating electrons,
The electron accelerator is configured such that each electron beam generated by a signal of a first level and a signal of a second level having a magnitude lower than the first level are oscillated within the same clock provided for synchronization, When the pulse signal is a high-level signal, an oscillation signal is generated from the power source unit to an electron beam, a signal with a lower voltage level than the RF pulse signal is generated correspondingly, and the RF pulse signal from the RF generation unit is a low- Wherein the oscillator generates an oscillation signal for the electron beam and a signal of a higher voltage level than the RF pulse signal from the power supply unit in a corresponding manner. delete A control method of an electron accelerator used in an apparatus for inspecting cargo which performs inspection through dual energy using an electron beam,
Providing a clock for synchronization;
Generating a first level signal for the one clock and a second level signal having a magnitude lower than the first level;
The oscillation signal is generated from the power supply unit to the electron beam and the voltage signal is lower in level than the RF pulse signal when the RF pulse signal from the RF generator in the clock is a high level signal, Generating an oscillation signal in the electron beam from the power supply unit and a signal of a higher voltage level than the RF pulse signal correspondingly when the RF pulse signal is a low level signal;
Generating the electron beam to correspond to the first and second levels;
≪ / RTI > 8. The method of claim 7,
And generating a power supply signal simultaneously with the first level and the second level signal, wherein the power supply signal is generated by applying a signal generated to the RF pulse signal of the first level to the RF pulse signal of the second level Wherein the signal has a magnitude lower than the magnitude of the signal generated for the control signal.

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