CN102095610B - Security inspection door for inspecting hard drugs/explosives and special nuclear matters/radioactive substances - Google Patents

Abstract

The invention discloses a safety inspection door, which includes a narcotics/explosives detection subsystem, a special nuclear substance/radioactive substance detection subsystem and a control analysis subsystem. These three subsystems are jointly installed in the inspection door casing. The inspection door is also provided with an isolating device, which is used to isolate the narcotics/explosives detection subsystem and the special nuclear substance/radioactive substance detection subsystem from each other, so as to work independently without mutual interference. Multiple air nozzles are arranged on the two side walls of the detection channel, the multiple air nozzles are arranged in layers, and the multiple air nozzles in the same layer point to the center of the detection space where the layer is located. In this way, the two detection subsystems are combined and made to work reliably, and the task of inspecting drugs/explosives and special nuclear/radioactive substances carried by pedestrians can be completed at the same time, which improves the inspection while ensuring accuracy and reliability. efficiency.

Description

Security inspection gates for detecting narcotics/explosives and special nuclear/radioactive substances

This application is a divisional application of the Chinese invention patent application with application number 200810115786.6 (application date: June 27, 2008; name of invention: safety inspection gate for detecting drugs/explosives and special nuclear/radioactive substances).

technical field

The invention relates to a safety inspection door, in particular to a safety inspection door capable of simultaneously detecting drugs/explosives and special nuclear substances/radioactive substances.

Background technique

Since the "911" incident, anti-terrorism has become a common topic around the world. Terrorist incidents have occurred in the United States, Russia, Britain, Egypt, Spain, Indonesia, India and other countries, and the United States has launched two wars for this. Terrorists use "human bomb" attack to become an important way of destruction, which poses a huge threat to the safe life of ordinary people and social stability. However, the safety gates currently on the market for pedestrian inspection can generally only detect magnetic metals, and are powerless to non-magnetic objects. Some explosives, drugs, and radioactive substances that can make dirty bombs are non-magnetic substances, which cannot be recognized by ordinary security doors. This is undoubtedly a major loophole for security inspections.

With the development of drug/explosives (IMS) technology, it becomes possible to detect suspicious particles such as drugs and explosives carried by pedestrians. In recent years, foreign experts have conducted a lot of research on gate-type pedestrian inspection technology using IMS technology, and applied for a number of patents. Such as: EP1286151A1, US5915268A1, US6073499A1 and US2001049926A1, etc. In these patents, in order to facilitate the collection of airflow, a variety of door structures have been proposed; in order to improve collection efficiency, some have proposed pre-concentration ideas (such as US6073499A1, etc.); Blow the inspected pedestrians with continuous air flow (such as US2001049926A1), and develop to add a nozzle spraying high-pressure gas to blow the clothes. Ways (such as EP1286151A1, US5915268A1 and US6073499A1).

In terms of detecting special nuclear substances and radioactive substances, the patent CN02289591.4 proposes a door-type γ-radiation safety detection device. By adopting directional shielding for the NaI(Tl) scintillator for measuring γ-radiation, only one side of the scintillator Gamma radioactivity within a solid angle range can be detected; multiple gamma probes are arranged in the doorposts on both sides of the door frame, which improves the detection efficiency of radioactive substances. Patent US2006/028494 A1 also proposes a radiation safety detection door, which uses multiple detectors and collimator arrays to realize the simultaneous detection of γ and n.

However, due to various reasons, especially the interference between systems, there is no device for simultaneously detecting drugs/explosive substances and special nuclear substances/radioactive substances on the market.

Contents of the invention

The present invention is just to solve the above-mentioned problems existing in the prior art, and prevents the mutual interference between the narcotics/explosives detection subsystem and the special nuclear substance/radioactive substance detection subsystem installed together by adopting isolation measures , thereby improving the inspection efficiency while ensuring the reliability and accuracy of the inspection.

According to the present invention, a safety inspection door is provided, including a narcotics/explosives detection subsystem, a special nuclear substance/radioactive substance detection subsystem, and a control analysis subsystem. These three subsystems are jointly installed in the inspection door casing, and It is characterized in that the safety inspection door is also provided with an isolating device, which is used to isolate the drug/explosives detection subsystem and the special nuclear substance/radioactive substance detection subsystem from each other, so as to work independently without mutual interference; Multiple air nozzles are arranged on the two side walls of the detection channel, and the multiple air nozzles are arranged in layers, and the multiple air nozzles in the same layer point to the center of the detection space where the layer is located.

The isolation device includes filters, decouplers and photoelectric isolators arranged on the signal lines, power lines and ground lines of the special nuclear substance/radioactive substance detection subsystem and/or drug/explosive substance detection subsystem.

The isolation device may also include a shield made of shielding material, and the shield is arranged on the radiation detector and the preamplifier in the special nuclear material/radioactive material detection subsystem.

Preferably, the security inspection door may further include a collimator, and the collimator is installed on the radiation detector in the special nuclear material/radioactive material detection subsystem to adjust the detection range of the radiation detector.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the embodiments of the present invention.

Description of drawings

1 is a perspective view showing the overall configuration of a security inspection door according to the present invention;

Fig. 2 is a sectional view of the safety inspection door according to the present invention as shown in Fig. 1, schematically showing the internal structure of the safety inspection door;

Fig. 3 is a partial perspective view of the security inspection door according to the present invention, specifically showing the arrangement of the air nozzles of the narcotics/explosives detection subsystem;

Fig. 4 specifically shows the direction of multiple air nozzles on the same layer;

Fig. 5 shows the arrangement of the air knife on the top wall of the security inspection door and the collimator and radiation detector on the side according to the present invention.

Detailed ways

Fig. 1 shows the overall construction of the security inspection door according to the present invention. As shown in FIG. 1 , an air inlet 3 , an air outlet 14 , a user terminal 24 , an indicator light 25 and an air nozzle 11 are arranged on the casing of the inspection door 29 according to the present invention. In addition, although not shown in FIG. 1 , an air knife 10 (shown in FIG. 5 ) is also arranged on the top wall of the inspection passage of the inspection door 29 . The indicator light 25 is used to indicate several states of the checked pedestrian: checking (yellow light)/idle (green light)/warning (red light). A user terminal 24 (eg, LCD display) is used to display the inspection results in detail.

Fig. 2 shows in detail the internal structure of the security inspection door according to the present invention. As shown in Figure 2, the narcotics/explosives detection subsystem, the special nuclear/radioactive substance detection subsystem, and the control analysis subsystem are all installed in the shell of the security inspection door.

The drug/explosives detection subsystem includes: air inlet 3, air compressor 1, carrier gas flow fan 2, air knife inlet pipe 5, jet air inlet pipe 6, solenoid valve 7, air knife blowing port 9, air knife 10, Air nozzle 11 , exhaust pipe 13 , exhaust port 14 , narcotics/explosives detector (IMS) 20 , suction fan 21 , precondenser 22 and suction port 23 .

The special nuclear substance/radioactive substance detection subsystem includes: a radiation detector 8 , a collimator 4 , a radiation detector signal line 12 , and a radiation detection subsystem control box 18 .

The control analysis subsystem includes a system control computer 16 and a general control cabinet 17 .

It should be pointed out that although the control analysis subsystem is installed inside the casing of the inspection door in this embodiment, it can also be arranged outside the casing according to actual needs.

Since there are many electromagnetic wave interference sources (such as compressor 1, fan 2, solenoid valve 7, etc.) in the drug/explosives detection subsystem, they will interfere with the special nuclear/radioactive substance detection subsystem, affecting its detection accuracy and reliability.

In order to avoid the influence of the above interference, the present invention provides a signal isolator 19, and the radiation detection control box 18 of the special nuclear substance/radioactive substance detection subsystem is connected to the main control cabinet 17 via the signal isolator 19 (an isolating device). Specifically, the signal isolator 19 in this embodiment is a filter, a decoupler, and a photoelectric isolator arranged on the signal line, power line, and ground line of the special nuclear substance/radioactive substance detection subsystem. It should be pointed out that although it is shown in FIG. 2 that the signal isolator 19 is only applied in the special nuclear substance/radioactive substance detection subsystem, this is not limiting, and it can also be used in the narcotics/explosives detection subsystem Apply signal isolator 19 or apply signal isolator 19 on both probing subsystems at the same time. That is to say, filters, decouplers and photoelectric isolators can be installed on the signal lines, power lines and ground lines of the narcotics/explosives detection subsystem, or can be installed on the signal lines, Set filters, decouplers and photoelectric isolators on the power line and ground.

At the same time, in order to further reduce interference, a shield (another isolation device) is set on the radiation detector and preamplifier in the special nuclear/radioactive detection subsystem. The shield is made of materials that can shield space radiation. become.

In addition, the signal lines of the narcotics/explosives detection subsystem and the signal lines of the special nuclear substance/radioactive substance detection subsystem should be arranged separately as far as possible, that is, they should be separated from each other in space, and the vertical cross wiring method should be adopted where the lines must cross. , to minimize crosstalk.

On the other hand, it can be seen from FIG. 2 and FIG. 5 that in this embodiment, a collimator 4 is provided outside the radiation detector 8 . The opening of the collimator 4 faces the detection space 28, its wall thickness is greater than 5-10 mm, and its material is generally lead. Its purpose is to adjust the detection range of the ray detector and reduce the interference of external rays on the inspection results of the inspected pedestrians. The reliability and accuracy of inspection can be improved.

As shown in FIG. 2 , in order to reduce costs, a set of radiation detectors 8 are respectively used on both sides of the detection space 28 . The positions of the radiation detectors 8 on both sides can be staggered from each other, but their detection areas should slightly overlap and cannot be completely separated, so as to ensure the reliability of the inspection results.

Multiple air nozzles 11 are arranged on the two side walls of the detection channel. As shown in FIG. 3 , a plurality of air nozzles 11 are arranged in layers, generally no less than 4 layers (5 layers in FIG. 3 ), and no less than 2 rows on each side (3 rows in FIG. 3 ). As shown in FIG. 4 , the direction of the air nozzle 11 of each layer is directed to the center of the detection space where the layer is located, so as to enhance the ability of blowing suspicious particles carried in the clothes. The horizontal main direction of the jet stream is indicated by jet stream direction 27 . The air nozzles 11 of the same layer are generally turned on/off at the same time, and the air nozzles 11 of different layers are turned on/off at different times, and are generally turned on or off sequentially from top to bottom. And down circulation, until the jet process ends, its switch sequence is sent by total control cabinet 17, realizes by controlling the solenoid valve 7 behind each jet nozzle 11.

As can be seen from Fig. 5, in the present embodiment, the air knives 10 that are arranged on the top wall of the detection channel and blow air downwards include four large air knives and two small air knives, and the four large air knives surround the two small air knives. Wind knife arrangement. However, those skilled in the art should understand that this is only exemplary, and other arrangements may also be used.

The working principle of the present invention is explained below.

1. Working principle of narcotics/explosives detection subsystem

As shown in Figure 2, the air compressor 1 provides high-pressure gas with a pressure of 0.2-0.8 MPa, preferably about 0.5 MPa. Air nozzles 11 are provided with high-pressure gas through air nozzle intake pipe 6, and each air nozzle 11 is controlled by a solenoid valve 7 to spray/close the state. The system control computer 16 controls the opening and closing timing of the electromagnetic valve 7, the air compressor 1, the carrier gas flow fan 2 and other components through the main control cabinet 17 and the air circuit control signal line 30. The air sucked by the air compressor 1 and the carrier gas flow fan 2 comes from the air inlet 3 .

When the uppermost air nozzle 11 starts working for the first time, the carrier gas flow blower 2 also starts working, supplying air to the air knife 10 as shown in FIG. 5 . The air flow is blown out from the air knife blowing port 9 of the air knife 10 to form a carrier gas flow, and its flow direction is shown as the flow direction 26 of the carrier gas flow. The effect of the carrier gas flow is to drive the suspicious particles blown down by the air nozzle 11 to the suction port 23 .

The carrier gas flow in the detection space 28 is sucked into the suction port 23 by the suction fan 21 . When the airflow containing suspicious particles entering the suction port 23 passes through the precondenser 22, the suspicious particles are absorbed into the precondenser 22, and the filtered airflow passes through the suction fan 21, the exhaust pipe 13, and the exhaust port 14. into the atmosphere outside. During the desorption process, the precondenser 22 releases the adsorbed suspicious particles, which are inhaled by the drug/explosives detector (IMS) 20 for analysis, and the exhaust gas is discharged to the outside through the exhaust pipe 13 and the exhaust port 14 In the atmosphere.

The data detected by the narcotics/explosives detector (IMS) 20 are sent to the main control cabinet 17 through the data line, and then sent to the system control computer 16 for analysis, and the results are displayed on the user terminal 24 and the indicator light 25 .

When starting to check, the indicator light 25 shows idle (green light is on), and the pedestrian to be checked enters the designated position of the detection space 28 and stands; 20 detection, and finally the analysis result is given by the system control computer 16. If traces of narcotics and explosives are found, an alarm will be sent, and indicator light 25 will report to the police (red light flashes); if no substance is found, then this inspection ends, and indicator light 25 shows idle (green light is on), waiting for the next Entry of the inspected person.

2. The working principle of the ray detection subsystem

When the inspected pedestrian enters the designated position in the detection space 28, the system starts to work before the narcotics/explosives detection subsystem under the control of the control analysis subsystem. After the drug/explosives detection subsystem finishes a measurement work, the The system ends the measurement work.

The gamma and n-rays are detected by the ray detector 8, and the detection signals are sent to the control box 18 of the ray detection subsystem. Since the ray detection subsystem is susceptible to interference, in order to prevent interference signals from the narcotics/explosives detection subsystem, the signal and control lines pass through the signal isolator 19, and the signal isolator to the main control cabinet signal line 15 and the main control cabinet 17 interconnection, the detection data is finally sent to the system control computer 16 for analysis and processing, and the results are sent to the user terminal 24 for display. The result displayed on the indicator light 25 is the final result after integrating the data of the two detection subsystems.

In this way, according to the present invention, the two detection subsystems are combined and made to work reliably, and the tasks of checking the drugs/explosives and special nuclear substances/radioactive substances carried by pedestrians can be completed simultaneously, which improves the accuracy while ensuring accuracy. Check efficiency.

Further modifications and applications of the present invention may be made by those skilled in the art without departing from the spirit and scope of the present invention as defined by the claims.

Claims (8)

1. a safety check door comprises drugs/explosive detection subsystem and special nucleus material/radioactive material detection subsystem and control analysis subsystem, and this three sub-systems is installed in the inspection door housing jointly, it is characterized in that:

Said safety check door also is provided with spacer assembly, and said spacer assembly is used to make drugs/explosive detection subsystem and special nucleus material/radioactive material detection subsystem to isolate each other, thereby work alone without interfering with each other;

Two sidewalls of sense channel are provided with a plurality of air nozzles, and said a plurality of air nozzle layered arrangement are pointed to the center in the detection space at these layers place with a plurality of air nozzles in one deck,

Wherein, said spacer assembly comprises wave filter, decoupling device and the photoisolator on signal wire, power lead and the ground wire that is arranged on special nucleus material/radioactive material detection subsystem and/or drugs/explosive detection subsystem.

2. safety check door according to claim 1, wherein, said spacer assembly comprises the shielding part of being processed by shielding material, said shielding part is arranged on the ray detector and prime amplifier in special nucleus material/radioactive material detection subsystem.

3. safety check door according to claim 1 further comprises collimating apparatus, and said collimating apparatus is installed on the ray detector in special nucleus material/radioactive material detection subsystem, the investigative range of regulating ray detector.

4. safety check door according to claim 3 wherein, staggers each other in the position of the said ray detector of sense channel both sides, but on the short transverse of sense channel, keeps a certain amount of overlapping.

5. safety check door according to claim 1; Wherein, Under the control of said control analysis subsystem, at first start said special nucleus material/radioactive material detection subsystem and survey, start said drugs/explosive detection subsystem then and survey; And when inspection finishes, at first stop said drugs/explosive detection subsystem, stop said special nucleus material/radioactive material detection subsystem at last.

6. safety check door according to claim 1, wherein, the roof of sense channel is provided with the air knife of blowing down, and said air knife comprises four big air knives and two little air knives, and four big air knives are arranged around two little air knives.

7. safety check door according to claim 1 further comprises the pilot lamp that shows detected state and check result.

8. according to the described safety check door of arbitrary claim among the claim 1-7; Wherein, The signal wire of the signal wire of said drugs/explosive detection subsystem and said special nucleus material/radioactive material detection subsystem spatially is separated from each other; In the time must intersecting cabling, adopt the square crossing wiring.

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