RU2247361C1 - Nuclear quadrupole resonance (nqr)detector of explosives, narcotics and metals hidden under clothes of people - Google Patents

Abstract

FIELD: use of nuclear quadrupole resonance (NQR), in particular, safety systems at inspection of access to guarded rooms.

SUBSTANCE: the NQR detector has an intake, signal normalization and processing unit, N video cameras, optical information processing device, weight platform, weigher, NQR transducer and indicator, transmitting device, damping device and an NQR transducer circuit tuning device. The person undergoing the inspection is placed in a double-glazed cabin and located on the weight platform positioned inside the cabin, whose inner wall is made of dielectric, and the outer wall serves as a screen. The NQR transducer circuit is positioned between the cabin walls, N video cameras are so installed that they do not detect the person undergoing the inspection in the preset position.

EFFECT: provided detection of metals, explosives, caseless inclusive, and narcotics, as well as their identification.

2 cl, 6 dwg

Description

The invention relates to the field of application of nuclear quadrupole resonance (NQR), in particular to security systems for access control in secure premises.

A device for the detection of explosive and narcotic substances [patent 2190842, application 2001118733, publ. 10/10/2002], containing a signal processor, an indicator device, a receiving device, a frequency synthesizer, a synchronizer, a power amplifier, a NQR signal sensor, a bandpass filter and a damping device. The first synchronizer output is connected to the first input of the receiving device, the second synchronizer output is connected to the second input of the receiving device, the first input of the synchronizer is connected to the output of the frequency synthesizer, the input of the damping device is connected to the third output of the synchronizer, and the output to the first input of the NQR sensor, the fourth output of the synchronizer connected to the input of the power amplifier, the output of which is connected to the input of the bandpass filter, the output of the bandpass filter is connected to the second input of the NQR signal sensor, output d The NQR signal sensor is connected to the third input of the receiving device. The first and second outputs of the receiving device are connected respectively to the first and second inputs of the signal processor, the first and second outputs of the signal processor are connected to the first and second inputs of the indicator device, the third output of the signal processor is connected to the second input of the synchronizer, the third input of the synchronizer is the input of the device for detecting explosive and narcotic substances.

The disadvantage of this device is the inability to detect metals.

The closest in technical essence is a device for remote detection of objects hidden under clothing of people [WO 02/35259 A1, publ. 05/02/2002], containing a series-connected radio receiving antenna focused on a portion of the body surface, a radiometric receiver, an information processing and display unit, the operator and the device for detecting objects placed in a heat-insulated cabin with double walls, between which there is a material that absorbs radio waves and located at a temperature different from the temperature of the human body, while the inner wall of the cab is made of radiolucent material, and the antenna is scanned through the body Sheep is carried out manually by the operator.

The disadvantages of this device is the inability to determine explosives, including without hull, and narcotic substances, as well as their identification. The technical result of the invention consists in achieving the possibility of detecting metals, explosives, including without hull, and narcotic substances, as well as their identification.

The essence of the invention lies in the fact that the NQR detector of explosive and narcotic substances and metals hidden under the clothing of people contains a receiving device, a signal conditioning and processing unit, and the person undergoing inspection is placed in a double-walled cabin. Distinctive features are that N video cameras, an optical information processing device, a weighing platform, a weighing device, an NQR sensor, a transmitting device, a damping device, an NQR sensor loop adjustment device and an indicator are introduced. The first output of the NQR sensor is connected to the input of the receiving device, the first output of which is connected to the first input of the signal conditioning and processing unit, the second output of the receiving device is connected to the second input of the signal forming and processing unit. The third input of the signal conditioning and processing unit is the input of the NQR detector of explosives and narcotic substances and metals hidden under people's clothing. The first output of the signal generating and processing unit is connected to the transmitting device, the output of the transmitting device is connected to the first input of the NQR sensor, the second output of the signal forming and processing unit is connected to the damping device, the output of the damping device is connected to the second input of the NQR sensor. The third output of the signal conditioning and processing unit is connected to the input of the NQR sensor loop trimmer, the output of the loop tuning device is connected to the third input of the NQR sensor, the weighing platform is connected to the weighing device, the output of the weighing device is connected to the fourth input of the signal shaping and processing block. The outputs of the N cameras are connected to the N inputs of the optical information processing device, the output of which is connected to the fifth input of the signal conditioning and processing unit, the fourth output of the signal conditioning and processing unit is connected to an indicator, and the fifth output of the signal conditioning and processing unit is connected to the second input of the receiving device. The sixth output of the signal conditioning and processing unit is connected to the N + 1 input of the optical information processing device, the NQR sensor loop being located between the walls of the cabin, the inner wall of which is made of dielectric, and the external is a screen. The person undergoing inspection is located on a weighing platform placed inside the cabin, and N video cameras are installed in such a way that at a predetermined position of the person undergoing inspection, they are not detected, and the cabin has an entrance and exit.

Figure 1 shows a block diagram of the proposed NQR detector of explosive and narcotic substances and metals hidden under the clothes of people.

Figure 2 shows a block diagram of a block for generating and processing a signal.

Figure 3 shows a block diagram of a weighing device.

Figure 4 shows a block diagram of a device for processing optical information.

Figure 5 shows a block diagram of a receiving device

Figure 6 shows a diagram of the NQR detector of explosive and narcotic substances and metals hidden under the clothing of people.

NQR detector of explosive and narcotic substances and metals hidden under people's clothing consists of a unit for generating and processing information 1 of a receiving device 2, a transmitting device 3, a damping device 4, a device for adjusting the contour of the NQR sensor 5, an optical information processing device 6, and a weight platform 7, made, for example, in the form of an elastic container of dielectric material, filled with liquid, a weighing device 8, N video cameras 9, a cabin 10, an indicator 11, an NQR sensor 12.

The first output of the NQR sensor 12 is connected to the input of the receiving device 2, the first output of which is connected to the first input of the signal conditioning and processing unit 1, the second output of the receiving device 2 is connected to the second input of the signal conditioning and processing unit 1. First output of the signal conditioning and processing unit 1 connected to the transmitting device 3, the output of the transmitting device 3 is connected to the first input of the NQR sensor 12. The second output of the signal generating and processing unit 1 is connected to the damping device 4, the output of the damping device and 4 is connected to the second input of the NQR sensor 12, the third output of the signal conditioning and processing unit 1 is connected to the input of the NQR sensor loop trimmer 5. The output of the NQR sensor loop trimmer 5 is connected to the third input of the NQR sensor 12. The output of the weighing platform 7 is hydraulically connected to a weighing device 8, the output of which is connected to the fourth input of the signal conditioning and processing unit 1, the fourth output of the signal conditioning and processing unit 1 is connected to the indicator 11, and the third input of the signal conditioning and processing unit La 1 is the input of the NQR detector of explosives and narcotic substances and metals hidden under the clothing of people. The fifth output of the signal conditioning and processing unit 1 is connected to the second input of the receiving device 2. The sixth output of the signal conditioning and processing unit 1 is connected to the N + 1 input of the optical information processing device 6. The output of each Nth video camera 9 is connected respectively to each Nth the input of the optical information processing unit 6, the output of which is connected to the fifth input of the signal forming and processing unit 1. The NQR sensor circuit 12 is placed between the walls of the cabin 10. The inner wall 14 of the cabin 10 is made of dielectric, and the outer wall Single 13 10 cockpit is a screen. In addition, the cabin 10 has an entrance and an exit. A person 15 undergoing inspection is located on a weight platform 7 placed inside the cabin 10, and N video cameras 9 are installed in such a way that at a predetermined position of the person 15 undergoing inspection, he does not detect it.

The signal generation and processing unit 1, an example of which is shown in FIG. 2, consists of a frequency synthesizer 15, a synchronizer 16, a signal processor 17, an exchange device 18, an arithmetic logic device 19, a storage device 20. The output of the frequency synthesizer 15 is connected to the first the input of the synchronizer 16, the output of the synchronizer 16 is connected to the first input of the signal processor 17, the first output of the signal processor 17 is connected to the first input of the exchange device 18, the first output of the exchange device 18 is connected to the second input of syn resonator 16. The second output of the signal processor is connected to the third input of the synchronizer 16. The third output of the exchange device 18 is connected to the first input of the arithmetic-logic device 19, the second output of which is connected to the input of the storage device 20, the output of the storage device 20 is connected to the second input of the arithmetic-logical device 19, the first output of the arithmetic logic device is connected to the second input of the exchange device 18.

The weighing device 8, an example of the implementation of which is shown in figure 3, consists of a series-connected pressure-voltage transducer 21, a DC amplifier 22 and an analog-to-digital converter 23.

The optical information processing device 6, an exemplary embodiment of which is shown in FIG. 4, consists of a multiplexer 24, a video signal-to-code converter 25, a digital comparator 26, and a threshold register 27. The output of the multiplexer 24 is connected to the input of the video-code-25 converter, the output of the video-signal converter code 25 is connected to the first input of the digital comparator 26, the output of the threshold register 27 is connected to the second input of the digital comparator 26.

The receiving device 2, an example of which is shown in FIG. 5, consists of a broadband amplifier 28, a first phase detector 29, a second phase detector 30, a phase shaper 31, a first low pass filter 32, a first analog-to-digital converter 33, and a second low-pass filter 34, of the second analog-to-digital converter 35. The output of the broadband amplifier 28 is connected to the first inputs of the first 29 and second 30 phase detectors, the first and second respectively connected to the second inputs of the first 29 and second 30 phase detectors the second outputs of the phase shaper 31. The output of the first phase detector 29 is connected to the first low-pass filter 32 connected in series with the first analog-to-digital converter 33. The second phase detector 30 is connected to the second low-pass filter 34, the second analog-to-digital converter 35, connected in series.

NQR detector of explosive and narcotic substances and metals hidden under clothing of people, works as follows:

The operator selects from the memory of the storage device 20 of the signal generation and processing unit 1 the parameters of a number of substances to be detected. Each substance has its own frequency for adjusting the contour of the NQR sensor 12, the reference frequency of the receiving device 2 supplied to the phase former 31 of the receiving device 2 from the synchronizer 16 (Fig. 6, graph e), the duration and repetition period of the radio pulses (Fig. 6, graph f) arriving at the transmitting device 3 from the synchronizer 16. The duration of any time intervals is a multiple of the duration of the period of the reference frequency.

Before starting work, it is necessary to check the absence of people and foreign objects inside the cabin 10. The operator receives a command to input 3 of the signal conditioning and processing unit 1 and then through the exchange device 18 activates the receiving device 2, the device for adjusting the NQR sensor loop 5, and the optical information processing device 6 . From the sixth output of the block for the formation and processing of signal 1, a signal proportional to the value of the threshold of video surveillance is received at the threshold register 27 of the optical information processing device 6. B deokamery 9 located at the entrance and exit of the cab 10 at a certain angle so that the person who took the correct place on the weighing platform 7, misses the surveillance zone cameras. At the same time, the signals from the video cameras 9 are fed to the inputs of the multiplexer 24 of the optical information processing device 6. Next, the signal from each video camera 9 is sequentially converted on a video signal-code converter 25 into a digital code and fed to the first input of the digital comparator 26, the second input of which is from the threshold register 27 a digital code of the value of the threshold of CCTV is received. When the signal from the video / code-converter 25 is exceeded by a threshold value, which corresponds to the absence of people and foreign objects in the cabin 10, the digital comparator 26 generates a signal fed to input 5 of the signal conditioning and processing unit 1 and then to indicator 11, which indicates an NQR explosive detector and narcotic substances and metals hidden under people's clothes, ready to go. After that, information about the mass is read from the weighing device 8, fed to the input 4 of the signal conditioning and processing unit 1 and then through the exchange device 18 to the storage device 20. In the case of information about the mass not equal to 0, the arithmetic logic unit (ALU) 19 Signal generation and processing unit 1 generates an alarm that prohibits the operation of the NQR detector of explosive and narcotic substances and metals hidden under the clothing of people, with its output to indicator 11.

If the mass is 0, which corresponds to the absence of 10 people or other objects inside the cabin, ALU 19 generates a signal allowing the subsequent operation of the NQR detector of explosive and narcotic substances and metals hidden under people's clothing. From the storage device 20 through the ALU 19, the exchange device 18, the input data for adjusting the loop of the NQR sensor 12 to the first resonant frequency corresponding to the first detectable substance previously selected by the operator are received at the input of the loop adjustment device 5. After completing the configuration of the circuit of the NQR sensor 12 is allowed to enter the cabin 10 of the person 15 undergoing inspection. A person 15 occupies a place in the cabin 10 on a weighing platform 7. Information about the mass of a person 15 is supplied from the weighing device 8 to the signal generation and processing unit 1 to the storage device 20. A person 15 located inside the cabin 10 upsets the contour of the NQR sensor 12. This can considered as a partial filling of the internal volume of the NQR 12 sensor coil with protein material with known characteristics:

- dielectric constant

- electrical conductivity.

Therefore, it is possible to predict the detuning of the NQR sensor contour depending on the mass of the person inside the NQR sensor 12.

After weighing the person (Fig. 6, graph c), the receiving device 2, together with the signal generation and processing unit 1, determines the magnitude and sign of the detuning of the NQR sensor loop 12. Information about the magnitude and sign of the mismatch goes to memory 20. Then, the device for adjusting the NQR sensor loop 5 adjusts the loop of the NQR sensor 12 again to the first resonant frequency, thus eliminating the detuning of the loop of the NQR sensor 12 by the mass of the person. Then ALU 19 compares the information about the real detuning of the NQR sensor loop with the predicted mass of a person. Processing is as follows. The predicted value is subtracted from the real detuning of the NQR sensor loop, then the type and amount of metal are determined by the sign and magnitude of the resulting detuning. Information about the metal is displayed on indicator 11.

Then ALU 19 forms the “Start” command (Fig. 6, graph d) and the NQR detector of explosives and narcotic substances and metals hidden under people's clothing performs the following operations:

- a sequence of radio pulses is transmitted by the transmitting device 3, consisting of N radio pulses (graph e, Fig.6);

- at the end of each radio pulse, a damping device 4 is turned on to suppress the natural oscillations of the sensor circuit to the sensitivity level of the receiving device (graph g, Fig.6);

- for a given time, the receiving device 2 is turned on, receiving the NQR response of the substance; information is transmitted to the signal generation and processing unit 1 (graph and, FIG. 6). The receiving information arriving after each NQR response has a signal-to-noise ratio of << 1.

The number of radio pulses, therefore, and NQR responses of the substance is selected sufficient to determine the given mass of the detected substance. The signal generating and processing unit 1 conducts coherent accumulation of the NQR response signal in the signal processor 17.

Upon completion of the accumulation of NQR responses of the substance, the result is transmitted through the exchange device 18 to ALU 19, where it is compared with a predetermined threshold previously stored in the memory 20. If the accumulated signal of NQR responses exceeds the threshold value, ALU 19 generates a “Detected” signal, which It is displayed on indicator 11.

The identification of substances is ensured by the fact that each detected substance corresponds to its own frequency of the NQR response and its own parameters of the sequence of radio pulses (Fig.6, graph e).

The detection of the following substances, selected by the operator, is carried out with the position of person 15 in the NQR sensor 12. The weighing operation is not performed, the previously obtained results of weighing the person are used 15. The loop of the NQR sensor 12 is tuned in the presence of person 15 inside the NQR sensor 12 to the frequency of the following substances. Next, the operations are repeated (Fig.6, graphs g-h) for each subsequent substance. The detection results for each substance selected by the operator are displayed on indicator 11 in the form of “Detected”.

As a result, it is possible to detect metals, explosives, including non-hull, and narcotic substances, as well as their identification.

Claims (2)

1. NQR detector of explosive and narcotic substances and metals hidden under clothing of people, containing a receiving device, a signal conditioning and processing unit, the person being screened is placed in a double-walled cabin, characterized in that N video cameras are inserted, a processing device optical information, a weighing platform, a weighing device, an NQR sensor and an indicator, a transmitting device, a damping device and a device for adjusting the contour of the NQR sensor, with the first output of the NQR sensor connected to the reception input device, the first output of which is connected to the first input of the signal conditioning and processing unit, the second output of the receiving device is connected to the second input of the signal conditioning and processing unit, the third input of the signal conditioning and processing unit is the input of the NQR detector of explosive and narcotic substances and metals hidden under the clothes of people, the first output of the signal conditioning and processing unit is connected to the transmitting device, the output of the transmitting device is connected to the first input of the NQR sensor, the second output of the signal processing and processing is connected to the damping device, the output of the damping device is connected to the second input of the NQR sensor, the third output of the signal forming and processing unit is connected to the input of the NQR sensor loop adjustment unit, the output of the circuit adjustment block is connected to the third NQR sensor input, the weight platform is connected to by a weighing device, the output of the weighing device is connected to the fourth input of the signal conditioning and processing unit, the outputs of N video cameras are connected to the N inputs of the optical processing device information, the output of which is connected to the fifth input of the signal conditioning and processing unit, the fourth output of the signal conditioning and processing unit is connected to an indicator, the fifth output of the signal conditioning and processing unit is connected to the second input of the receiving device, the sixth output of the signal conditioning and processing unit is connected to N +1 to the input of the optical information processing device, and the NQR sensor circuit is located between the walls of the cabin, the inner wall of which is made of a dielectric, and the outer one is a screen, and ek passing inspection, is placed on the weighing platform inside the cabin, and N video cameras installed so that at a predetermined position of a person passing inspection, does not detect it. 2. NQR detector of explosive and narcotic substances and metals hidden under the clothes of people, according to claim 1, characterized in that the cabin has an entrance and exit.

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