CN108490497B - Security inspection system and method - Google Patents
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- CN108490497B CN108490497B CN201810116566.9A CN201810116566A CN108490497B CN 108490497 B CN108490497 B CN 108490497B CN 201810116566 A CN201810116566 A CN 201810116566A CN 108490497 B CN108490497 B CN 108490497B
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- 238000007689 inspection Methods 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000001514 detection method Methods 0.000 claims abstract description 73
- 230000003287 optical effect Effects 0.000 claims abstract description 30
- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 12
- 230000010355 oscillation Effects 0.000 claims description 11
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 11
- 238000003384 imaging method Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000002360 explosive Substances 0.000 description 4
- 238000002310 reflectometry Methods 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
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- 230000000712 assembly Effects 0.000 description 1
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- 238000004590 computer program Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/005—Prospecting or detecting by optical means operating with millimetre waves, e.g. measuring the black losey radiation
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Abstract
The present disclosure provides a security inspection system. The system comprises: the security inspection module comprises a transceiver component and an optical component, wherein the transceiver component transmits detection signals and receives reflection information, the optical component forms a fan-shaped beam in the vertical direction based on the detection signals, and the reflection signals are reflected by the fan-shaped beam through a body to be detected. The disclosure also provides a security inspection method.
Description
Technical Field
The present disclosure relates to the field of security inspection, and more particularly, to a security inspection system and method.
Background
In recent years, security problems have become increasingly interesting for governments and citizens, and security checks are required to be performed in a plurality of public places (such as stations, hospitals, museums, etc.). Therefore, people put higher demands on the security inspection efficiency and experience of the security inspection system.
In the process of implementing the inventive concept, the inventor finds that at least the following problems exist in the prior art: the working principle of the existing mainstream security inspection system mainly comprises: the method comprises the steps that a linear array is adopted to complete quick scanning in the vertical direction, and mechanical movement is adopted to realize circular arc direction scanning, so that the scanning time is long in the security inspection process, a body to be detected is required to be kept static in the whole scanning process, otherwise, if the body to be detected is obviously moved in the scanning security inspection process, a clear image cannot be formed; the method can complete the scanning of the object to be detected quickly by adopting the area array, but the system cost is high, and in the security inspection scanning process, if the object to be detected moves quickly, the scanning cannot be completed at the same time due to the fact that more scanning units can not complete the scanning at the same time, so that the scanning results of different scanning units are different, and finally imaging is blurred.
Disclosure of Invention
In view of this, the present disclosure provides a security inspection system and method.
One aspect of the present disclosure provides a security inspection system comprising: one or more security modules comprising: transceiver component and optical component. The receiving and transmitting assembly is used for transmitting the detection signal and receiving the reflected signal; the optical assembly is used for forming a fan-shaped beam in the vertical direction based on the detection signals. Wherein the reflected signal is obtained by reflection of the fan beam via the body to be detected.
According to an embodiment of the present disclosure, the transceiver module includes: a transceiver for generating a transmission signal; an array antenna, the array antenna comprising: one or more transmitting antennas for transmitting a detection signal based on the transmission signal; and one or more receiving antennas for receiving the reflected signal and feeding back the reflected signal to the transceiver.
According to an embodiment of the present disclosure, the above security module further includes: the frequency mixing unit is connected with the transceiver, mixes frequencies based on the transmitting signal and the local oscillation signal to obtain a reference signal, and mixes frequencies based on the reflecting signal and the local oscillation signal to obtain a measuring signal; the demodulation unit demodulates the reference signal and the measurement signal to obtain detection data; the security inspection system further comprises a processing module which is connected with the demodulation unit and obtains a section scanning image of the body to be detected in the vertical direction based on the detection data. The local oscillation signal is generated by a transceiver of the security module.
According to an embodiment of the present disclosure, the above processing module: obtaining a plurality of section scanning images of the to-be-detected body in the vertical direction based on different detection data of the to-be-detected body at different moments when the to-be-detected body passes through the security inspection system; and synthesizing a three-dimensional image of the object to be detected based on the plurality of section scans.
According to an embodiment of the present disclosure, the array antenna includes a linear array antenna; and/or the arrangement mode of the array antenna comprises sparse arrangement.
According to an embodiment of the present disclosure, the array antenna includes a plurality of transmitting antennas and a plurality of receiving antennas; the transceiver assembly further comprises an electronic switch for switching the plurality of transmitting antennas and the plurality of receiving antennas.
According to an embodiment of the present disclosure, the above-described optical assembly includes: a cylindrical lens or a quasi-optical system based on a cylindrical reflecting surface to refract the detection signal to form the fan-shaped beam in the vertical direction.
According to an embodiment of the present disclosure, the optical assembly includes at least one cylindrical lens: at least one cylindrical lens is arranged on the transmitting end face of at least one transmitting antenna and is integrated with the at least one transmitting antenna into a whole; and/or at least one cylindrical lens is arranged on the receiving end face of at least one receiving antenna and integrated with at least one receiving antenna.
According to an embodiment of the present disclosure, the transceiver includes a millimeter wave transceiver or a terahertz transceiver.
According to the embodiment of the disclosure, the security inspection system further comprises a conveyor belt and a conveyor belt driving motor, and the conveyor belt can convey the object to be inspected at a constant speed under the driving of the conveyor belt driving motor.
Another aspect of the present disclosure provides a security inspection method, including: generating a detection signal; and forming a fan beam in a vertical direction based on the detection signal; the fan beam is reflected by the body to be detected to obtain a reflected signal.
According to an embodiment of the present disclosure, the above security inspection method further includes: generating a transmitting signal and a local oscillator signal; obtaining detection data based on the emission signal, the local oscillation signal and the reflection signal; and obtaining a section scanning image of the body to be detected in the vertical direction based on the detection data. Wherein the detection signal is generated based on the transmission signal.
According to an embodiment of the present disclosure, based on the transmission signal, the local oscillation signal, and the reflection signal, obtaining the detection data includes: mixing based on the transmitting signal and the local oscillator signal to obtain a reference signal; mixing based on the reflected signal and the local oscillator signal to obtain a measurement signal; and demodulating the reference signal and the measurement signal to obtain detection data.
According to an embodiment of the present disclosure, in a security inspection process of the body to be inspected: based on different detection data at different moments, a plurality of section scanning images in the vertical direction of the body to be detected can be obtained; the security inspection method further comprises the following steps: based on the plurality of section scans, three-dimensional images of the object to be detected are synthesized.
According to the embodiment of the disclosure, the technical problems of inaccurate detection results and long time consumption in the detection process caused by movement of the body to be detected in security inspection can be at least partially solved, and therefore the technical effects of accurately detecting, accelerating the security inspection speed and improving the security inspection experience of passengers can be achieved.
According to the embodiment of the disclosure, because the sparse array antenna is adopted to transmit the detection signal and receive the reflection signal, compared with the existing area array, the number of the transmitting antenna and the receiving antenna of the system can be at least partially reduced, the design of the array antenna is simplified, and the cost of the system is reduced.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of embodiments thereof with reference to the accompanying drawings in which:
FIG. 1 schematically illustrates an application scenario diagram of a security inspection system and method according to an embodiment of the present disclosure;
FIGS. 2A-2B schematically illustrate block diagrams of a security module in a security system according to an embodiment of the disclosure;
FIGS. 2C-2D schematically illustrate schematic structural views of optical components in a security inspection system according to embodiments of the present disclosure;
FIG. 3 schematically illustrates a block diagram of a security module in a security system according to another embodiment of the present disclosure;
FIG. 4 schematically illustrates a block diagram of a security inspection system according to an embodiment of the present disclosure;
FIG. 5 schematically illustrates a structural schematic of a security inspection system according to an embodiment of the present disclosure;
FIG. 6 schematically illustrates a flow chart of a security inspection method according to an embodiment of the disclosure;
7A-7B schematically illustrate a flow chart of a security inspection method according to another embodiment of the present disclosure;
fig. 8 schematically illustrates a flow chart of a security inspection method according to yet another embodiment of the present disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is only exemplary and is not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and/or the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.
Where expressions like at least one of "A, B and C, etc. are used, the expressions should generally be interpreted in accordance with the meaning as commonly understood by those skilled in the art (e.g.," a system having at least one of A, B and C "shall include, but not be limited to, a system having a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.). Where a formulation similar to at least one of "A, B or C, etc." is used, in general such a formulation should be interpreted in accordance with the ordinary understanding of one skilled in the art (e.g. "a system with at least one of A, B or C" would include but not be limited to systems with a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.). It should also be appreciated by those skilled in the art that virtually any disjunctive word and/or phrase presenting two or more alternative items, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the items, either of the items, or both. For example, the phrase "a or B" should be understood to include the possibility of "a" or "B", or "a and B".
Embodiments of the present disclosure provide a security inspection system and method. The security inspection system comprises one or more security inspection modules, wherein the security inspection modules comprise a transceiver component and an optical component, and the transceiver component is used for transmitting detection signals and receiving reflected signals; the optical assembly is used for forming a fan-shaped beam in the vertical direction based on the detection signals. Wherein the reflected signal is obtained by reflection of the fan beam via the body to be detected. Through the detection signal of vertical direction fan-shaped wave beam form for the body that waits to detect need not to keep static when passing through this security inspection system can detect and obtain accurate result, thereby accelerated the security inspection speed, promoted the security inspection experience of passenger.
Fig. 1 schematically illustrates an application scenario diagram of a security inspection system and method according to an embodiment of the present disclosure. It should be noted that fig. 1 is only an example of an application scenario in which the security inspection system and method of the embodiments of the present disclosure may be applied, so as to help those skilled in the art understand the technical content of the present disclosure, but not to mean that the embodiments of the present disclosure may not be applied to other application scenarios.
As shown in fig. 1, the application scenario 100 includes a security inspection module 10 and a processing module 20, which are configured to perform security inspection on a to-be-detected body 70.
The number of the security inspection modules 10 may be one or more, in this embodiment of the disclosure, two security inspection modules are disposed oppositely, so as to be used for detecting the object to be detected in different directions. The security module 10 comprises a transceiver component 11 and an optical component 12, wherein the transceiver component 11 is used for transmitting detection signals, the optical component 12 is used for focusing the detection signals into a fan-shaped beam in the vertical direction, and the fan-shaped beam can be used for scanning a single tangential plane in the vertical direction of a body to be detected.
The transceiver component 11 may be composed of a transceiver and an array antenna.
And a transceiver for implementing mutual conversion between electromagnetic wave signals and electric signals, wherein the transceiver can be a millimeter wave transceiver, a terahertz transceiver or the like according to the frequency of the transmitted signals.
The array antenna is used for transmitting electromagnetic wave signals transmitted by the transceiver to the body to be detected so as to realize detection scanning of the body to be detected. The array antenna can be a linear array or an area array, can adopt a single-shot double-shot mode or a multiple-shot mode, and can be arranged in a periodic or sparse mode.
The optical component may be an optical element, an optical system, or the like capable of forming the electromagnetic wave signal propagated by the array antenna into a fan-shaped beam in the vertical direction. The optical element may be, for example, a cylindrical lens or the like capable of focusing millimeter wave or terahertz wave, and the optical system may be, for example, a quasi-optical system or the like based on a cylindrical reflection surface.
The processing module 20 may be various terminal devices having processing computing functions, such as a server, a tablet Personal Computer (PC), a desktop PC, a laptop PC, a netbook computer, a smart phone, or the like.
The fan beam is reflected by the body to be detected 70 to obtain a reflected signal, the reflected signal is received by the transceiver component 11 and then converted into an electrical signal, the transceiver signal is mixed and demodulated and then transmitted to the processing module 20, and the processing module 20 can process the demodulated data to obtain a section scanning image of the body to be detected, thereby realizing the detection of the body to be detected.
It should be understood that the number of security modules, the location of the security modules, the type of processing module, and the type of object to be inspected in fig. 1 are merely illustrative. According to the implementation requirement, the device can be provided with any number of security inspection modules positioned at any position, and any type of processing module is adopted to detect any type of object to be detected.
Fig. 2A to 2B schematically show structural block diagrams of a security module in a security system according to an embodiment of the present disclosure.
As shown in fig. 2A, the security inspection system 200 includes one or more security inspection modules 210, the security inspection modules 210 including a transceiver component 211 and an optical component 212.
The transceiver component 211 transmits the detection signal and receives the reflected signal.
According to the embodiment of the disclosure, the reflected signal is obtained by reflecting the emitted detection signal after processing through the body to be detected, and the reflected signal is related to the reflectivity of the position where the detection signal contacts the body to be detected, so that the information of the body to be detected can be reversely deduced according to the reflected signal.
In accordance with an embodiment of the present disclosure, as shown in fig. 2B, the transceiver component 211 may include a transceiver 2111 and an array antenna. The transceiver is used for generating a transmitting signal and receiving a reflected signal fed back by the array antenna, and the array antenna is used for transmitting a detecting signal based on the transmitting signal and receiving the reflected signal and feeding the reflected signal back to the transceiver for the transceiver to receive.
According to the embodiment of the disclosure, when the body to be detected is a human body, the transceiver may be a millimeter wave transceiver or a terahertz transceiver, the detection signal is a millimeter wave or a terahertz wave, and the device has small radiation damage to the human body and higher detection precision. It will be appreciated that the above-described types of transceivers are merely to aid in understanding the present disclosure, and that the present disclosure is not limited to the type of transceivers employed, and that one skilled in the art may utilize suitable transceivers in combination with actual subjects to be tested, security inspection system costs, and the like.
According to an embodiment of the present disclosure, the array antenna includes one or more transmitting antennas 2112 and one or more receiving antennas 2113 for transmitting a detection signal and receiving a reflection signal based on the transmission signal, respectively, and feeding back the reflection signal to the transceiver.
According to the embodiment of the disclosure, the array antenna may be a linear array antenna or an area array antenna, and the arrangement mode of the array antenna may be periodic arrangement or sparse matrix arrangement, and the setting mode of the array antenna includes a multi-transmission multi-reception mode, a single-transmission single-reception mode or a single-transmission double-reception mode.
According to the embodiment of the disclosure, the array antenna is a MIMO (multiple-transmit multiple-receive) linear array, and if the number of transmitting units of the linear array in the single-transmit single-receive mode is N, the number of transmitting units of the area array sparse array is far greater than 2N, and the number of transmitting units required by the MIMO linear array is only 2N 1/2 The method comprises the steps of carrying out a first treatment on the surface of the Namely, the MIMO linear array can reduce the number of receiving and transmitting units, reduce the system cost and reduce the scanning time.
According to the embodiment of the disclosure, the array antenna can be placed perpendicular to the ground or at a certain angle with the ground, and the actual placement mode of the array antenna depends on the application scene of the security inspection system of the embodiment of the disclosure.
According to the embodiment of the disclosure, the plurality of transmitting antennas and receiving antennas are all provided, one transmitting antenna in the MIMO linear array transmits, all receiving antennas can receive simultaneously, for example, the whole array can adopt a sparse arrangement method, and the equivalent array (the convolution of the transmitting antenna position and the receiving antenna position) is a full array which is arranged.
According to an embodiment of the present disclosure, the transceiver assembly further includes an electronic switch for switching the plurality of transmitting antennas and the plurality of receiving antennas. The transmitting antenna which can be switched rapidly can acquire holographic data through the receiving and transmitting assembly, so that higher detection precision can be ensured.
According to an embodiment of the present disclosure, the transmitted and/or reflected signals comprise broadband signals for enabling resolution of the distance direction (the horizontal direction perpendicular to the security module); the bandwidth of the transmitted and/or reflected signals is typically 70-80 GHz. It is to be understood that the bandwidths of the foregoing emission signals and/or reflection signals are merely examples for understanding the present disclosure, and the present disclosure is not limited to the bandwidths thereof, and it is to be understood that the greater the bandwidths of the emission signals and/or reflection signals, the better the range resolution, and that, on the premise that the bandwidths are fixed, the imaging range of the detection image obtained based on the reflection signals depends on the number of frequency sampling points.
The optical component 212 forms a fan beam in the vertical direction based on the detection signal.
According to the embodiments of the present disclosure, compared with the conventional divergent beam, the fan beam in the vertical direction does not need to scan the entire surface of the object to be detected, but only scans one tangential plane in the vertical direction of the object to be detected, so that the scanning time may be, for example, microsecond, the reflected signal is only related to the reflectivity of the tangential plane, and is not affected by the movement of the object to be detected in the security inspection process, so that the accuracy of the detected image obtained based on the reflected signal is higher. Especially for human body security inspection, the passenger is not required to be in a static state in the security inspection process, so that the security inspection experience of the passenger can be improved.
Fig. 2C to 2D schematically illustrate structural schematic diagrams of optical components in a security inspection system according to an embodiment of the present disclosure.
As shown in fig. 2C, the optical assembly 212 may include a cylindrical lens 2121, where the cylindrical lens 2121 is disposed on an end face of the array antenna of the transceiver assembly 211 and is used for refracting the detection signal emitted by the transceiver assembly 211 to form a fan-shaped beam in a vertical direction, and may also be used for converting a reflection signal reflected by the object to be detected, so as to ensure that the receiving and transmitting gains of the signals are the same, avoid interference of external signals, and improve detection accuracy.
According to the embodiment of the present disclosure, the cylindrical lens 2121 is provided so that the focal length (focal length in the beam emission direction) of the cylindrical lens is ensured at a position near the surface of the surface to be detected to improve detection accuracy.
As shown in fig. 2D, the optical assembly includes a plurality of cylindrical lenses 2122, each of the plurality of cylindrical lenses 2122 may be integrated with a transmitting antenna 2112 of the array antenna to form a transmitting unit; alternatively, each of the plurality of cylindrical lenses 2122 may be integrated with the receiving antenna 2113 into a receiving unit. With this arrangement, the security inspection system of the embodiments of the present disclosure can be further simplified.
According to the embodiment of the disclosure, the optical component may also be a quasi-optical system based on a cylindrical reflecting surface, so that the detection signal is refracted to form a fan-shaped beam in the vertical direction, and the specific quasi-optical system design depends on practical requirements. The optical assembly of embodiments of the present disclosure may at least partially avoid attenuation of the detection signal and the reflected signal.
Fig. 3 schematically illustrates a block diagram of a security module in a security system according to another embodiment of the present disclosure.
As shown in fig. 3, the security module 210 includes a mixing unit 213 and a demodulation unit 214 in addition to the transceiver component 211 and the optical component 212.
The mixing unit 213 is connected to the transceiver 2111 to obtain a reference signal based on the mixing of the transmit signal and the local oscillator signal, and to obtain a measurement signal based on the mixing of the reflected signal and the local oscillator signal.
According to an embodiment of the present disclosure, the mixing unit 213 comprises a mixer whose output signal has a frequency equal to the sum, difference or other combination of the frequencies of the two input signals. The mixer is composed of a nonlinear element and a frequency-selecting loop.
According to an embodiment of the present disclosure, the local oscillator signal is generated by the transceiver 2111 of the transceiver component 211 described with reference to fig. 2B.
The demodulation unit 214 is connected to the mixing unit 213, and is configured to demodulate the reference signal and the measurement signal obtained by mixing by the mixing unit 213, thereby obtaining detection data, where the reflection signal depends on the reflectivity of the section of the body to be detected, and the obtained detection data is related to the reflectivity of the section of the body to be detected.
According to an embodiment of the present disclosure, the demodulation unit 214 may include an I/Q demodulator, for example, to perform digital demodulation, so that the measurement signal and the reference signal can obtain holographic data (i.e. detection data) after being demodulated by the I/Q demodulator. It should be noted that the implementation of the demodulation unit 214 is not limited to a hardware implementation, and the demodulation unit 214 may also be a program stored on a storage medium, where the program may include code/executable instructions, which when executed by a terminal device including a storage medium, cause the terminal device to demodulate the reference signal and the measurement signal to obtain detection data.
Fig. 4 schematically illustrates a block diagram of a security inspection system according to an embodiment of the present disclosure.
As shown in fig. 4, the security inspection system 200 includes a processing module 220 in addition to the security inspection module 210.
The processing module 220 obtains a scan of a section of the object to be detected in a vertical direction based on the detection data.
According to an embodiment of the disclosure, the processing module 220 may perform two-dimensional millimeter wave imaging (distance direction and vertical direction) on a tangential plane of a to-be-detected object in a vertical direction by using an image reconstruction technology according to detection data, for example, to obtain a scanned tangential plane of the to-be-detected object in the vertical direction. When the transceiver of the transceiver component is a millimeter wave transceiver, the detection data is holographic data.
According to the embodiment of the disclosure, in the process that the object to be detected passes through the security inspection system, a plurality of different detection data at different moments can be obtained in a very short time interval through the frequency mixing unit 213 and the demodulation unit 214 in the security inspection module 210, and then the processing module 220 can obtain a plurality of section scanning diagrams of the object to be detected in the vertical direction based on the plurality of different detection data, that is, section imaging of a plurality of different positions of the object to be detected is realized.
The processing module 220 may also synthesize a three-dimensional image of the object to be detected based on a plurality of scan images, for example. For example, an image synthesis technology can be adopted to obtain an image of the object to be detected, when the transceiver is a millimeter wave transceiver, the plurality of transmitting antennas are rapidly switched under the control of the electronic switch, a plurality of section scanning images can be obtained after processing, and then the image synthesis technology can be adopted to obtain the three-dimensional millimeter wave holographic imaging of the whole object to be detected. It will be appreciated that the above image synthesis techniques are merely examples for understanding the present disclosure, and the present disclosure is not limited to implementation methods for obtaining three-dimensional images from multiple tangent plane scans, for example, embodiments of the present disclosure may also employ image reconstruction techniques to obtain the three-dimensional images. According to an embodiment of the disclosure, the security inspection system may further include a display device, where the display device is configured to display a three-dimensional image of a current object to be inspected in real time, and then a worker may determine whether the object to be inspected includes or carries prohibited objects such as a gun, a bullet, an explosive, a control device, and a flammable and explosive object in real time according to the displayed three-dimensional image.
According to an embodiment of the disclosure, the processing module 220 may further automatically identify the obtained three-dimensional image, and when identifying that the object to be detected includes or carries prohibited articles such as a gun, a bullet, an explosive article, a control device, a flammable and explosive article, etc., the processing module may automatically alarm to remind the current staff.
The processing module 220 may be, for example, any terminal device with processing functions, or may be software/hardware integrated into the terminal device, according to an embodiment of the present disclosure. The demodulation unit 214 may also be integrated in the terminal device, for example. It will be appreciated that the processing module 220 and the demodulation unit 214 may be combined in one module or any one of the modules may be split into a plurality of modules. Alternatively, at least some of the functionality of one or more of the modules may be combined with at least some of the functionality of other modules and implemented in one module. According to embodiments of the present disclosure, at least one of the processing module 220 and the demodulation unit 214 may be implemented at least in part as hardware circuitry, such as a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), a system on a substrate, a system on a package, an Application Specific Integrated Circuit (ASIC), or any other reasonable way of integrating or packaging circuitry, or in hardware or firmware, or in a suitable combination of three implementations of software, hardware, and firmware. Alternatively, at least one of the processing module 220 and the demodulation unit 214 may be at least partially implemented as a computer program module, which when executed by a computer may perform the functions of the respective module.
Fig. 5 schematically illustrates a structural schematic diagram of a security inspection system according to an embodiment of the present disclosure.
As shown in fig. 5, the security inspection system 500 includes the conveyor belt 30 and the conveyor belt driving motor 40 in addition to the security inspection module 10 and the processing module 20 in the application scenario of the security inspection system described with reference to fig. 1.
According to an embodiment of the present disclosure, the security inspection module 10 may be the security inspection module described with reference to fig. 2A to 4, the processing module 20 may be the processing module 220 described with reference to fig. 4, and the security inspection module 10 may further include, for example, a mixer and a demodulator in addition to the transceiver component 11 and the optical component 12, and the mixer and the demodulator may be integrated with the transceiver component 11, for example.
According to the embodiment of the present disclosure, the conveyor 30 is driven by the conveyor driving motor 40 to convey the object to be inspected 70 at a constant speed. The conveyor belt drive motor 40 is controlled by the processing module 20. Specifically, the speed of the conveyor belt 30 can be set according to the working efficiency of the security module and the processing module or the imaging rate of the entire security system.
According to the embodiment of the disclosure, the security inspection module 10 comprises two sets which are oppositely arranged, and in the case that the body to be inspected is a human body, in actual inspection, as shown in fig. 5, the inspected person 70 stands laterally on the conveyor belt 30, and passes through the security inspection system at a uniform speed under the driving of the conveyor belt. In the scanning process, each moment detection signal (for example, millimeter wave signal) irradiates a section of a person to be detected along the connecting line direction of two groups of security inspection modules in a fan beam mode to scan, and the scanning time is in microsecond level; the two-dimensional millimeter wave imaging is carried out on the section through the receiving and transmitting assembly 11, the mixer and the processing module 20 in the security inspection module 10 in sequence by a synthetic aperture technology, so that a person to be inspected can form a plurality of section imaging at different positions through the security inspection system under the drive of a conveyor belt, and then the three-dimensional millimeter wave holographic image of the whole human body can be obtained by an image synthesis technology. It can be understood that in the security inspection process, the orientation of the inspected person can also be perpendicular to the direction of the connecting line of the two security inspection modules; the number and the arrangement positions of the above security inspection modules are merely examples for understanding the disclosure, and the disclosure is not limited thereto, for example, the number of the security inspection modules may be four, and they may be respectively arranged at four azimuth angles.
According to the embodiment of the disclosure, by the security inspection system described with reference to fig. 5, since the object to be inspected passes through the security inspection system at a constant speed under the drive of the conveyor belt, it can be ensured that the obtained tangential planes at different positions can cover all areas of the object to be inspected, thereby ensuring the integrity of the three-dimensional image and improving the security inspection accuracy.
FIG. 6 schematically illustrates a flow chart of a security inspection method according to an embodiment of the disclosure;
as shown in fig. 6, the security inspection method includes operations S610 to S620.
In operation S610, a detection signal is generated. In accordance with an embodiment of the present disclosure, the operation S610 may be performed by the transceiver component 211 in the one or more security inspection modules 210 described with reference to fig. 2A, which is not described herein.
In operation S620, a fan beam in a vertical direction is formed based on the detection signal; the fan beam is reflected by the body to be detected to obtain a reflected signal. According to an embodiment of the present disclosure, the operation S620 may be performed by the optical assembly 212 described with reference to fig. 2A and the optical assemblies 2121/2122 described with reference to fig. 2C-2D, or may be performed by a quasi-optical system based on a cylindrical reflection surface, which is not described herein.
Fig. 7A-7B schematically illustrate a flow chart of a security inspection method according to another embodiment of the present disclosure.
As shown in fig. 7A, the security inspection method includes operations S710 to S730 in addition to operations S610 to S620. The operation S710 may be performed before the operation S610, and the operations S720 and S730 may be performed after the operation S620.
In operation S710, a transmission signal and a local oscillation signal are generated. Wherein the detection signal described in operation S610 is generated based on the transmission signal. This operation S710 may be performed by the transceiver 2111 described with reference to fig. 2B, according to an embodiment of the present disclosure, which is not described herein.
In operation S720, detection data is obtained based on the transmission signal, the local oscillation signal, and the reflection signal. According to an embodiment of the present disclosure, the operation S720 may be performed by the mixing unit 213 and the demodulation unit 214 described with reference to fig. 3, which is not described herein.
According to an embodiment of the present disclosure, operation S720 may include operations S721 to S723 described with reference to fig. 7B. Operation S721, obtaining a reference signal based on the mixing of the transmission signal and the local oscillation signal; operation S722, obtaining a measurement signal based on the mixing of the reflected signal and the local oscillation signal; in operation S723, the reference signal and the measurement signal are demodulated to obtain detection data. According to an embodiment of the present disclosure, the operations S721 and S722 may be performed by the mixing unit 213 described with reference to fig. 3, and the operation S723 may be performed by the demodulation unit 214 described with reference to fig. 3, which will not be described again.
In operation S730, a tangential scan of the body to be detected in the vertical direction is obtained based on the detection data. This operation S730 may be performed by the processing module 220 described with reference to fig. 4 according to an embodiment of the present disclosure, which is not described herein.
Fig. 8 schematically illustrates a flow chart of a security inspection method according to yet another embodiment of the present disclosure.
As shown in fig. 8, the method includes operations S810 to S820 in addition to operations S610 to S620 and operations S710 to S720.
In the security inspection process of the object to be inspected, through operations S610 to S620 and operations S710 to S720, a plurality of different detection data at different times can be obtained, and in operation S810, a plurality of section scan images in the vertical direction of the object to be inspected are obtained based on the different detection data at different times; this operation S810 may be performed by the processing module 220 described with reference to fig. 4 according to an embodiment of the present disclosure, which is not described herein.
In operation S820, a three-dimensional image of the object to be detected is synthesized based on the plurality of section scans. This operation S820 may also be performed by the processing module 220 described with reference to fig. 4 according to an embodiment of the present disclosure, which is not described herein.
In summary, by the security inspection method described with reference to fig. 8, due to the adoption of the detection signal in the form of the fan beam in the vertical direction, the technical problems of inaccurate detection result and long time consumption in the detection process caused by the movement of the object to be detected in the security inspection can be at least partially solved, and therefore, the technical effects of accurately detecting, accelerating the security inspection speed and improving the security inspection experience of passengers can be achieved.
Those skilled in the art will appreciate that the features recited in the various embodiments of the disclosure and/or in the claims may be provided in a variety of combinations and/or combinations, even if such combinations or combinations are not explicitly recited in the disclosure. In particular, the features recited in the various embodiments of the present disclosure and/or the claims may be variously combined and/or combined without departing from the spirit and teachings of the present disclosure. All such combinations and/or combinations fall within the scope of the present disclosure.
While the present disclosure has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. The scope of the disclosure should, therefore, not be limited to the above-described embodiments, but should be determined not only by the following claims, but also by the equivalents of the following claims.
Claims (8)
1. A security inspection system, comprising:
one or more security modules, the security modules comprising:
the receiving and transmitting assembly transmits the detection signal and receives the reflected signal, and the receiving and transmitting assembly comprises a transceiver and generates a transmission signal;
an optical component for forming a fan beam in a vertical direction based on the detection signal,
wherein the reflected signal is obtained by the reflection of the fan-shaped beam by a body to be detected;
the frequency mixing unit is connected with the transceiver, mixes the frequency based on the transmitting signal and the local oscillation signal to obtain a reference signal, and mixes the frequency based on the reflecting signal and the local oscillation signal to obtain a measuring signal;
a demodulation unit for demodulating the reference signal and the measurement signal to obtain detection data;
the processing module is connected with the demodulation unit, and is used for obtaining a plurality of section scanning images of the to-be-detected body in the vertical direction based on different detection data of different moments when the to-be-detected body passes through the security inspection system, and synthesizing a three-dimensional image of the to-be-detected body based on the section scanning images;
wherein the local oscillator signal is generated by the transceiver, and the transceiver comprises a millimeter wave transceiver or a terahertz transceiver.
2. The system of claim 1, wherein the transceiver component comprises:
an array antenna, comprising:
one or more transmitting antennas that transmit the detection signal based on the transmission signal; and
one or more receiving antennas for receiving the reflected signal and feeding back the reflected signal to the transceiver.
3. The system of claim 2, wherein:
the array antenna comprises a linear array antenna; and/or
The array antenna is arranged in a sparse mode.
4. The system of claim 2, wherein:
the array antenna comprises a plurality of transmitting antennas and a plurality of receiving antennas;
the transceiver assembly further includes an electronic switch for switching the plurality of transmit antennas and the plurality of receive antennas.
5. The system of claim 2, wherein the optical assembly comprises a cylindrical lens or a quasi-optical system based on a cylindrical reflective surface to refract the detection signal to form a vertically directed fan beam.
6. The system of claim 2, wherein the optical assembly comprises at least one cylindrical lens:
at least one cylindrical lens is arranged on the transmitting end face of at least one transmitting antenna and is integrated with at least one transmitting antenna into a whole; and/or
At least one cylindrical lens is arranged on the receiving end face of at least one receiving antenna and is integrated with at least one receiving antenna.
7. The system of claim 1, further comprising a conveyor belt and a conveyor belt drive motor, the conveyor belt being capable of conveying the object to be inspected at a constant speed under the drive of the conveyor belt drive motor.
8. A security inspection method comprising:
generating a detection signal;
forming a fan-shaped beam in the vertical direction based on the detection signal, wherein the fan-shaped beam is reflected by a body to be detected to obtain a reflected signal;
generating a transmit signal and a local oscillator signal, the transmit signal and the local oscillator signal being generated by a transceiver, the transceiver comprising a millimeter wave transceiver or a terahertz transceiver;
mixing to obtain a reference signal based on the transmitting signal and the local oscillator signal;
obtaining a measurement signal based on the reflected signal and the local oscillator signal by mixing;
demodulating the reference signal and the measurement signal to obtain detection data;
obtaining a plurality of section scanning images of the body to be detected in the vertical direction based on different detection data at different moments;
synthesizing a three-dimensional image of the object to be detected based on the plurality of section scans;
wherein the detection signal is generated based on the transmission signal.
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| CN109799538A (en) * | 2018-12-29 | 2019-05-24 | 清华大学 | Rays safety detection apparatus and its control method |
| CN109946748A (en) * | 2019-03-18 | 2019-06-28 | 北京环境特性研究所 | Thinned array antenna design method applied to cylinder scanning safety check imaging system |
| CN110146464A (en) * | 2019-05-30 | 2019-08-20 | 上海理工大学 | A kind of crawler belt safe examination system based on terahertz imaging |
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