CN207946362U - security system - Google Patents

Abstract

The present disclosure provides a security inspection system. The system includes: one or more security inspection modules, the security inspection module includes a transceiver component and an optical component, wherein the transceiver component transmits a detection signal and receives reflection information, and the optical component forms a vertical fan beam based on the detection signal , wherein the reflected signal is obtained by reflecting the fan beam through the object to be detected.

Description

security system

technical field

The present disclosure relates to the field of security inspection, and more specifically, to a security inspection system.

Background technique

In recent years, security issues have been increasingly concerned by the government and citizens, and security checks are required when entering many public places (such as stations, hospitals, museums, etc.). Therefore, people put forward higher requirements for the security inspection efficiency and experience of the security inspection system.

In the process of realizing the concept of the utility model, the inventor found that there are at least the following problems in the prior art: the working principle of the existing mainstream security inspection system mainly includes: using a linear array to complete a fast scan in the vertical direction, and using a mechanical movement To realize scanning in the arc direction, this security inspection method has a long scanning time during the security inspection process, and requires the object to be detected to remain still during the entire scanning process, otherwise, if the object to be detected moves significantly during the scanning security inspection, it cannot be formed. clear image; using the area array array to scan the object to be detected as a whole, this method can complete the scanning of the object to be detected quickly, but the system cost is very high, and in the process of security scanning, if the object to be detected moves quickly, it will be due to A large number of scanning units cannot complete scanning at the same time, so there will be differences in scanning results of different scanning units, and finally the imaging will be blurred.

Utility model content

In view of this, the present disclosure provides a security inspection system.

The present disclosure provides a security inspection system, including: one or more security inspection modules, where the security inspection module includes: a transceiver assembly and an optical assembly. Wherein, the transceiver component is used to transmit the detection signal and receive the reflected signal; the optical component is used to form a vertical fan beam based on the detection signal. Wherein, the reflected signal is obtained by reflecting the fan beam through the object to be detected.

According to an embodiment of the present disclosure, the above-mentioned transceiver component includes: a transceiver for generating a transmit signal; an array antenna comprising: one or more transmit antennas for transmitting a detection signal based on the transmit signal; and one or more receive antennas for receiving Reflect the signal and feed the reflected signal back to the transceiver.

According to an embodiment of the present disclosure, the above security inspection module further includes: a frequency mixing unit, connected to the transceiver, to obtain a reference signal based on the frequency mixing of the transmitted signal and the local oscillator signal, and to obtain a measurement signal based on the frequency mixing of the reflected signal and the local oscillator signal The demodulation unit demodulates the reference signal and the measurement signal to obtain detection data; the security inspection system also includes a processing module connected to the demodulation unit, and based on the detection data, obtains a vertical section scan of the object to be detected picture. Wherein, the local oscillator signal is generated by the transceiver of the security inspection module.

According to an embodiment of the present disclosure, the above-mentioned processing module: based on different detection data at different times when the object to be detected passes through the security inspection system, obtains a plurality of cross-sectional scanning images in the vertical direction of the object to be detected; A three-dimensional image of the object to be detected.

According to an embodiment of the present disclosure, the array antenna includes a linear array antenna; and/or, the arrangement of the array antenna includes a sparse arrangement.

According to an embodiment of the present disclosure, the above-mentioned array antenna includes multiple transmitting antennas and multiple receiving antennas; the above-mentioned transceiver component further includes an electronic switch for switching between the multiple transmitting antennas and the multiple receiving antennas.

According to an embodiment of the present disclosure, the above-mentioned optical component includes: a cylindrical lens or a quasi-optical system based on a cylindrical reflective surface, to refract the detection signal to form the fan beam in the vertical direction.

According to an embodiment of the present disclosure, the above-mentioned optical assembly includes at least one cylindrical lens: at least one cylindrical lens is placed on the emitting end surface of at least one transmitting antenna, and is integrated with at least one transmitting antenna; and/or, at least one The cylindrical lens is placed on the receiving end surface of at least one receiving antenna and integrated with at least one receiving antenna.

According to an embodiment of the present disclosure, the above transceiver includes a millimeter wave transceiver or a terahertz transceiver.

According to an embodiment of the present disclosure, the above-mentioned security inspection system further includes a conveyor belt and a conveyor belt drive motor, and the conveyor belt can transport the object to be detected at a constant speed under the drive of the conveyor belt drive motor.

According to the embodiments of the present disclosure, the technical problems of inaccurate detection results and time-consuming detection process caused by the movement of the object to be detected can be at least partially solved, and thus accurate detection can be achieved, the speed of security inspection can be accelerated, and the security inspection experience of passengers can be improved. technical effect.

According to the embodiment of the present disclosure, since the sparsely arranged linear array antennas are used to transmit the detection signal and receive the reflected signal, compared with the existing area array, at least part of the system’s transmitting antenna and receiving antenna can be reduced. number of antennas, simplifying array antenna design and reducing system cost.

Description of drawings

The above and other objects, features and advantages of the present disclosure will be more clearly described through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

FIG. 1 schematically shows an application scenario diagram of a security inspection system and method according to an embodiment of the present disclosure;

2A-2B schematically show a structural block diagram of a security check module in a security check system according to an embodiment of the present disclosure;

2C to 2D schematically illustrate the structure of optical components in the security inspection system according to an embodiment of the present disclosure;

Fig. 3 schematically shows the security inspection flow chart of the security inspection system described in Fig. 2A to Fig. 2D;

Fig. 4 schematically shows a structural block diagram of a security check module in a security check system according to another embodiment of the present disclosure;

Fig. 5 schematically shows a structural block diagram of a security inspection system according to an embodiment of the present disclosure;

Figures 6A to 6B schematically show the security inspection flow chart of the security inspection system described in Figures 4 to 5;

Fig. 7 schematically shows another security check flowchart of the security check system described in Fig. 4 to Fig. 5;

Fig. 8 schematically shows a schematic structural diagram of a security inspection system according to an embodiment of the present disclosure.

Detailed ways

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. It should be understood, however, that these descriptions are exemplary only, and are not intended to limit the scope of the present disclosure. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept 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 present disclosure. The terms "comprising", "comprising", etc. used herein indicate the presence of stated features, steps, operations and/or components, but do not exclude 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 meaning commonly understood by one of ordinary skill in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted to have a meaning consistent with the context of this specification, and not be interpreted in an idealized or overly rigid manner.

Where expressions such as "at least one of A, B, and C, etc." are used, they should generally be interpreted as those skilled in the art would normally understand the expression (for example, "having A, B, and C A system of at least one of "shall include, but not be limited to, systems with A alone, B alone, C alone, A and B, A and C, B and C, and/or A, B, C, etc. ). Where expressions such as "at least one of A, B, or C, etc." are used, they should generally be interpreted as those skilled in the art would normally understand the expression (for example, "having A, B, or C A system of at least one of "shall include, but not be limited to, systems with A alone, B alone, C alone, A and B, A and C, B and C, and/or A, B, C, etc. ). Those skilled in the art should also understand that virtually any transitional conjunction and/or phrase that represents two or more alternative items, whether in the specification, claims, or drawings, should be understood to include these Possibility of one of the items, either of those items, or both. For example, the phrase "A or B" should be read to include the possibilities of "A" or "B," or "A and B."

Embodiments of the present disclosure provide a security inspection system. The security inspection system includes one or more security inspection modules, and the security inspection module includes a transceiver component and an optical component, wherein the transceiver component is used to transmit a detection signal and receive a reflected signal; the optical component is used to form a vertical fan beam based on the detection signal. Wherein, the reflected signal is obtained by reflecting the fan beam through the object to be detected. Through the detection signal in the form of a vertical fan beam, the object to be detected can be detected without keeping still when passing through the security inspection system to obtain accurate results, thereby speeding up the security inspection speed and improving the security inspection experience of passengers.

Fig. 1 schematically shows an application scenario diagram of a security inspection system according to an embodiment of the present disclosure. It should be noted that Fig. 1 is only an example of the application scenario of the security inspection system to which the embodiment of the present disclosure can be applied, to help those skilled in the art understand the technical content of the present disclosure, but it does not mean that the embodiment of the present disclosure cannot 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 for performing security inspection on a subject 70 to be detected.

The security inspection module 10 may be one or more, in the embodiment of the present disclosure, there are two security inspection modules, and the two security inspection modules are arranged opposite to each other, so as to detect the object to be detected in different directions. The security inspection module 10 includes a transceiver component 11 and an optical component 12, wherein the transceiver component 11 is used to transmit a detection signal, and the optical component 12 is used to focus the detection signal into a vertical fan beam, which can be used to detect objects Perform a scan of a single slice in the vertical direction.

The transceiver component 11 may consist of a transceiver and an array antenna.

The transceiver is used to realize the mutual conversion between the electromagnetic wave signal and the electrical signal, and the transceiver may be, for example, a millimeter wave transceiver or a terahertz transceiver according to the frequency of the transmitted signal.

The array antenna is used for propagating the electromagnetic wave signal emitted by the transceiver, so as to propagate to the object to be detected to realize the detection scanning of the object to be detected. The array antenna can be, for example, a linear array or an area array, and can adopt a single transmission and single reception, single transmission and double reception, or multiple transmission and multiple reception modes, and the arrangement can be, for example, a periodic arrangement or a sparse arrangement.

The optical component may be an optical element, an optical system, or the like capable of forming a vertical fan beam of the electromagnetic wave signal propagated by the array antenna. The optical element may be, for example, a cylindrical lens capable of focusing millimeter waves or terahertz waves, and the optical system may be, for example, a quasi-optical system based on a cylindrical reflective surface.

The processing module 20 may be various terminal devices with processing and computing functions, such as servers, tablet personal computers (PCs), desktop PCs, laptop PCs, netbook computers, or smart phones.

The fan-shaped beam is reflected by the object to be detected 70 to obtain a reflected signal. The reflected signal is received by the transceiver component 11 and converted into an electrical signal. The transceiver signal is mixed and demodulated and then transmitted to the processing module 20. The final data can be processed to obtain the cross-sectional scan diagram of the object to be tested, so as to realize the detection of the object to be tested.

It should be understood that the number of security inspection modules, locations of security inspection modules, types of processing modules, and types of objects to be detected in FIG. 1 are only schematic. According to the implementation requirements, there can be any number of security inspection modules located at any position, and any type of processing module can be used to detect any type of object to be detected.

2A-2B schematically show a structural block diagram of a security inspection module in a security inspection 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 , and the security inspection module 210 includes a transceiver assembly 211 and an optical assembly 212 .

The transceiver component 211 transmits the detection signal and receives the reflection signal.

According to an embodiment of the present disclosure, the reflected signal is obtained by reflecting the transmitted detection signal through the object to be detected after processing, and the reflected signal is related to the reflectivity of the place where the detection signal contacts the object to be detected, and the detected object can be deduced according to the reflected signal. body information.

According to an embodiment of the present disclosure, as shown in FIG. 2B , the transceiver component 211 may include a transceiver 2111 and an array antenna. Wherein, the transceiver is used to generate the transmission signal and receive the reflection signal fed back by the array antenna, and the array antenna is used to transmit the detection signal based on the transmission signal, and feed back to the transceiver after receiving the reflection signal for the transceiver to receive.

According to an embodiment of the present disclosure, when the object to be detected is a human body, the transceiver can be a millimeter wave transceiver or a terahertz transceiver, and the detection signal is a millimeter wave or a terahertz wave, which has little radiation damage to the human body and has a high Detection accuracy. It can be understood that the above types of transceivers are only for helping to understand the present disclosure, and the present disclosure does not limit the types of transceivers used. Those skilled in the art can comprehensively consider the actual object to be detected, the cost of the security inspection system, etc. to use a suitable transceiver.

According to an embodiment of the present disclosure, the above-mentioned array antenna includes one or more transmitting antennas 2112 and one or more receiving antennas 2113, which are used to transmit detection signals and receive reflected signals based on the transmitted signals and feed the reflected signals back to the transceiver. device.

According to an embodiment of the present disclosure, the array antenna can be a linear array antenna or a planar array antenna, etc., and the array antenna can be arranged in a periodic arrangement or a sparse matrix arrangement, etc., and the setting mode of the array antenna includes multiple Multi-receipt mode, single-send and single-receive mode or single-send and double-receive mode.

According to an embodiment of the present disclosure, the array antenna is a MIMO (Multiple Transmit Multiple Receive) linear array array, then it is assumed that the number of transceiver units of the linear array array in the single-transmit and single-receive mode is N, and the number of transceiver units of the planar sparse array is much greater than 2N, and The number of transceiver units required by the MIMO line array array is only 2N ^1/2 ; that is, the MIMO line array array can reduce the number of transceiver units, reduce system cost, and reduce scanning time.

According to the embodiment of the present disclosure, the array antenna can be placed perpendicular to the ground, or can be placed at a certain angle to the ground. The actual placement of the array antenna depends on the application scenario of the security inspection system in the embodiment of the present disclosure.

According to an embodiment of the present disclosure, there are multiple transmitting antennas and receiving antennas, one transmitting antenna in the MIMO linear array transmits, and all receiving antennas can receive simultaneously, and the entire array can be sparsely arranged, for example, Its equivalent array (the position of the transmitting antenna and the position of the receiving antenna is convolved) is a full array of arrays.

According to an embodiment of the present disclosure, the above-mentioned transceiver component further includes an electronic switch configured to switch between the multiple transmitting antennas and the multiple receiving antennas. Then, through the transceiver component, the working transmitting antenna can be quickly switched, and the acquisition of holographic data can be realized, thereby ensuring high detection accuracy.

According to an embodiment of the present disclosure, the transmitted signal and/or reflected signal includes a broadband signal for realizing resolution in the distance direction (perpendicular to the horizontal direction of the security inspection module); the bandwidth of the transmitted signal and/or reflected signal is typically It is 70-80GHz. It can be understood that the above-mentioned bandwidth of the transmitted signal and/or reflected signal is only used as an example for understanding the present disclosure, and the present disclosure does not limit the bandwidth thereof, and it can be understood that the bandwidth of the transmitted signal and/or reflected signal The larger the , the better the resolution in the range direction, and under the premise of a certain bandwidth, the imaging range of the detection image obtained based on the reflected signal depends on the number of frequency sampling points.

The optical component 212 forms a vertical fan beam based on the detection signal.

According to the embodiment of the present disclosure, compared with the traditional 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 a section in the vertical direction of the object to be detected. Therefore, the scanning time For example, it can be in the order of microseconds, and the reflection signal is only related to the reflectivity of the cut surface, and will not be affected by the movement of the object to be detected during the security inspection process, so the detection image obtained based on the reflection signal has high accuracy. Especially for human body security check, since it is not necessary to keep passengers in a static state during the security check process, the security check experience of passengers can be improved.

2C to 2D schematically illustrate the structure of optical components in the 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, which is placed on the end face of the array antenna of the transceiver assembly 211 for refracting the detection signal emitted by the transceiver assembly 211 to form a vertical direction The fan-shaped beam can also be used to convert the reflected signal reflected by the object to be detected, so as to ensure that the signal receiving and sending gains are the same, avoid external signal interference, and improve detection accuracy.

According to the embodiment of the present disclosure, the setting of the cylindrical lens 2121 should ensure that the focal length of the cylindrical lens (the focal length along the beam emitting direction) is near the surface of the object to be detected, so as to improve the detection accuracy.

As shown in Figure 2D, the optical assembly includes a plurality of cylindrical lenses 2122, and each of the plurality of cylindrical lenses 2122 can be integrated with the transmitting antenna 2112 of the array antenna to form a transmitting unit; or, the plurality of cylindrical lenses Each of the lenses 2122 may be integrated with the receiving antenna 2112 to form a receiving unit. Through this setting, the security inspection system of the embodiment of the present disclosure can be further simplified.

According to an embodiment of the present disclosure, the above-mentioned optical component can also be a quasi-optical system based on a cylindrical reflective surface, which is used to refract the detection signal to form a vertical fan-shaped beam. The specific design of the quasi-optical system depends on actual needs. The optical components of the embodiments of the present disclosure can at least partially avoid the attenuation of detection signals and reflection signals.

Fig. 3 schematically shows the security inspection flow chart of the security inspection system described in Fig. 2A to Fig. 2D;

As shown in FIG. 3 , the security inspection process of the security inspection system includes operations S310 - S320 .

In operation S310, a detection signal is generated. According to an embodiment of the present disclosure, the operation S310 may be performed by the transceiver components 211 in one or more security inspection modules 210 described with reference to FIG. 2A , and details are not described herein again.

In operation S320, a vertical fan beam is formed based on the detection signal; the fan beam is reflected by the object to be detected to obtain a reflected signal. According to an embodiment of the present disclosure, the operation S320 may be performed by the optical assembly 212 described with reference to FIG. 2A and the optical assembly 2121/2122 described with reference to FIGS. This will not be repeated here.

Fig. 4 schematically shows a structural block diagram of a security inspection module in a security inspection system according to another embodiment of the present disclosure.

As shown in FIG. 4 , the security inspection module 210 includes a frequency mixing unit 213 and a demodulation unit 214 in addition to the transceiver component 211 and the optical component 212 .

Wherein, the frequency mixing unit 213 is connected to the transceiver 2111 to obtain a reference signal based on the frequency mixing of the transmitted signal and the local oscillator signal, and obtain a measurement signal based on the frequency mixing of the reflected signal and the local oscillator signal.

According to an embodiment of the present disclosure, the frequency mixing unit 213 includes a mixer, and the frequency of the output signal is equal to the sum, difference, or other combination of the frequencies of the two input signals. The mixer consists of nonlinear elements and frequency-selective loops.

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 .

Wherein, the demodulation unit 214 is connected with the frequency mixing unit 213, and is used to demodulate the reference signal and the measurement signal mixed by the frequency mixing unit 213 to obtain detection data. , so the obtained detection data is related to the reflectivity of the cut surface of the object to be detected.

According to an embodiment of the present disclosure, the demodulation unit 214 may include, for example, an I/Q demodulator to perform digital demodulation, and the measurement signal and the reference signal may be demodulated by the I/Q demodulator to obtain holographic data ( i.e. detection data). It should be noted that the implementation of the demodulation unit 214 is not limited to hardware implementation, and the demodulation unit 214 may also be a program stored on a storage medium, and the program may include codes/executable instructions, which are executed by a storage medium. During execution, the terminal device enables the terminal device to demodulate the reference signal and the measurement signal to obtain detection data.

Fig. 5 schematically shows a structural block diagram of a security inspection system according to an embodiment of the present disclosure.

As shown in FIG. 5 , the security inspection system 200 includes a processing module 220 in addition to the security inspection module 210 .

Wherein, the processing module 223, based on the detection data, obtains a vertical slice scan image of the object to be detected.

According to an embodiment of the present disclosure, the processing module 223 can, for example, perform two-dimensional millimeter-wave imaging (distance direction and vertical direction) on the vertical section of the object to be detected by using image reconstruction technology according to the detection data, to obtain the image of the object to be detected. Slice scans in the vertical direction. Wherein, when the transceiver of the transceiver component is a millimeter wave transceiver, the detection data is holographic data.

According to the embodiment of the present disclosure, when the object to be detected passes through the security inspection system, through the frequency mixing unit 213 and the demodulation unit 214 in the security inspection module 210, multiple different detection data, the processing module 220 can obtain multiple slice scan images of the object to be detected in the vertical direction based on the multiple different detection data, that is, realize slice imaging at multiple different positions of the object to be detected.

According to an embodiment of the present disclosure, for example, the processing module 220 may also synthesize a three-dimensional image of the object to be detected based on multiple slice scan images. For example, image synthesis technology can be used to obtain the image of the object to be detected. When the transceiver is a millimeter wave transceiver, multiple transmitting antennas are quickly switched under the control of an electronic switch, and multiple slice scans can be obtained after processing, and then The three-dimensional millimeter-wave holographic imaging of the entire object to be detected can be obtained by using the image synthesis technology. It can be understood that the above-mentioned image synthesis technology is only used as an example to understand the present disclosure, and the present disclosure does not limit the implementation method of obtaining a three-dimensional image from multiple slice scan images. For example, the embodiment of the present disclosure can also use image reconstruction technology to obtain the obtained the three-dimensional image.

According to an embodiment of the present disclosure, the above-mentioned security inspection system may further include, for example, a display device, which is used to display the three-dimensional image of the current object to be detected in real time, and the staff can judge in real time according to the displayed three-dimensional image whether the object to be detected contains Or carry guns, bullets, explosives, controlled appliances, flammable and explosive items and other prohibited items.

According to an embodiment of the present disclosure, the processing module 220 can also automatically identify the obtained three-dimensional image, when it is recognized that the object to be detected includes or carries guns, bullets, explosives, controlled appliances, inflammable and explosive items When waiting for prohibited items, it can automatically alarm to remind the current staff.

According to an embodiment of the present disclosure, the processing module 223 may be, for example, any terminal device having a processing function, or may be software/hardware integrated in the terminal device. However, the demodulation unit 214 can also be integrated in the terminal, for example. It can be understood that the processing module 220 and the demodulation unit 214 can be implemented in one module, or any one of the modules can be divided into multiple modules. Alternatively, at least part of the functions of one or more of these modules may be combined with at least part of the functions of other modules and implemented in one module. According to an embodiment of the present disclosure, at least one of the processing module 220 and the demodulation unit 214 may be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), a system on a chip, system-on-substrate, system-on-package, application-specific integrated circuit (ASIC), or any other reasonable means of integrating or packaging circuits that may be implemented in hardware or firmware, or in software, hardware, and firmware appropriate combination to achieve. 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, and when the program is executed by a computer, the functions of the corresponding module may be performed.

FIGS. 6A-6B schematically show the security inspection flow chart of the security inspection system described in FIGS. 4-5 .

As shown in FIG. 6A , the security inspection process includes operations S610 to S630 in addition to operations S310 to S320 . The operation S610 may be performed before the operation S310, and the operations S620 and S630 may be performed after the operation S320.

In operation S610, a transmit signal and a local oscillator signal are generated. Wherein, the detection signal described in operation S310 is generated based on the transmission signal. According to an embodiment of the present disclosure, the operation S610 may be performed by the transceiver 2111 described with reference to FIG. 2B , which will not be repeated here.

In operation S620, detection data is obtained based on the transmitted signal, the local oscillator signal and the reflected signal. According to an embodiment of the present disclosure, the operation S620 may be performed by the frequency mixing unit 213 and the demodulation unit 214 described with reference to FIG. 4 , which will not be repeated here.

According to an embodiment of the present disclosure, operation S620 may specifically include operation S621 to operation S623 described with reference to FIG. 6B . In operation S621, a reference signal is obtained based on the frequency mixing of the transmitted signal and the local oscillator signal; in operation S622, a measurement signal is obtained based on the frequency mixing of the reflected signal and the local oscillator signal; in operation S623, the reference signal and the measurement signal are demodulated to obtain detection data. According to an embodiment of the present disclosure, operation S621 and operation S622 may be performed by the frequency mixing unit 213 described with reference to FIG. 4 , and operation S623 may be performed by the demodulation unit 214 described with reference to FIG. 4 , which will not be repeated here.

In operation S630, based on the detection data, a vertical slice scanning image of the object to be detected is obtained. According to an embodiment of the present disclosure, the operation S630 may be performed by the processing module 220 described with reference to FIG. 5 , which will not be repeated here.

Fig. 7 schematically shows another security inspection flow chart of the security inspection system described in Fig. 4 to Fig. 5 .

As shown in FIG. 7 , the method further includes operations S710 to S720 in addition to operations S310 to S320 and operations S610 to S620 .

During the security inspection process of the object to be detected, a plurality of different detection data at different times can be obtained through operations S310-S320 and operations S610-S620, then in operation S710, based on different detection data at different times, the to-be-detected Multiple slice scan images in the vertical direction of the volume; according to an embodiment of the present disclosure, the operation S710 may be performed by the processing module 220 described with reference to FIG. 5 , and details are not repeated here.

In operation S720, a three-dimensional image of the object to be detected is synthesized based on the plurality of slice scan images. According to an embodiment of the present disclosure, the operation S720 may also be performed by the processing module 220 described with reference to FIG. 5 , which will not be repeated here.

Fig. 8 schematically shows a schematic structural diagram of a security inspection system according to an embodiment of the present disclosure.

As shown in FIG. 8 , the security inspection system 800 includes a conveyor belt 30 and a conveyor belt drive 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 FIGS. 2A-2D and FIGS. In addition to the component 11 and the optical component 12 , for example, a mixer and a demodulator may also be included, and the mixer and demodulator may be integrated with the transceiver component 11 , for example.

According to the embodiment of the present disclosure, the conveyor belt 30 can transport the object 70 to be detected at a constant speed under the drive of the conveyor belt drive motor 40 . The conveyor 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 inspection module and the processing module or the imaging rate of the entire security inspection system.

According to an embodiment of the present disclosure, the security inspection module 10 includes two groups that are arranged oppositely. When the object to be inspected is a human body, during actual inspection, as shown in FIG. 8 , the inspected person 70 stands sideways on the conveyor belt 30 Driven by the conveyor belt, it passes through the security inspection system at a constant speed. During the scanning process, the detection signal (for example, a millimeter wave signal) is irradiated in the form of a fan beam on a section of the subject along the direction of the connection of the two sets of security inspection modules for scanning at each moment, and the scanning time is at the microsecond level; The transceiver component 11, mixer and processing module 20 in the module 10 perform two-dimensional millimeter-wave imaging on the section through the synthetic aperture technology, and then the examinee can form multiple sections at different positions through the security inspection system driven by the conveyor belt Imaging, and then using image synthesis technology to obtain a three-dimensional millimeter-wave holographic image of the entire human body. It can be understood that during the security check process, the orientation of the subject can also be perpendicular to the direction of the connection between the two security check modules; the number and installation positions of the above security check modules are only examples for understanding the present disclosure, and the present disclosure does not This is limited, for example, the number of security inspection modules can also be four groups, which are respectively arranged at four azimuth angles and the like.

According to an embodiment of the present disclosure, by referring to the security inspection system described in FIG. 8 , since the object to be detected passes through the security inspection system at a uniform speed driven by the conveyor belt, it can be ensured that the acquired slices at different positions can cover all regions of the object to be detected. Thereby ensuring the integrity of the three-dimensional image and improving the accuracy of the security check.

To sum up, the security inspection system proposed in this disclosure can at least partially solve the problem of inaccurate detection results and long detection process caused by the movement of the object to be detected in the security inspection due to the use of detection signals in the form of vertical fan beams. Therefore, it can realize the technical effect of accurate detection, speed up the security check rate and improve the passenger security check experience.

Those skilled in the art can understand that various combinations and/or combinations of the features described in the various embodiments and/or claims of the present disclosure can be made, even if such combinations or combinations are not explicitly recorded in the present disclosure. In particular, without departing from the spirit and teaching of the present disclosure, the various embodiments of the present disclosure and/or the features described in the claims can be combined and/or combined in various ways. 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 thereto, it should be understood by those skilled in the art that other modifications may be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Various changes in form and details have been made to this disclosure. Therefore, the scope of the present disclosure should not be limited to the above-described embodiments, but should be determined not only by the appended claims, but also by the equivalents of the appended claims.

Claims (10)

1. a kind of safe examination system, which is characterized in that the safe examination system includes：

One or more safety check modules, the safety check module include：

Transmitting-receiving subassembly, transmitting detection signal simultaneously receive reflection signal；

Optical module forms the fan-shaped beam of vertical direction based on the detection signal,

Wherein, the reflection signal is reflected to obtain by the fan-shaped beam via body to be detected.

2. system according to claim 1, which is characterized in that the transmitting-receiving subassembly includes：

Transceiver generates transmitting signal；

Array antenna, including：

One or more transmitting antennas emit the detection signal based on the transmitting signal；And

One or more reception antennas receive the reflection signal, and the reflection signal are fed back to the transceiver.

3. system according to claim 2, it is characterised in that：

The safety check module further includes：

Mixing unit is connected to the transceiver of the safety check module, is mixed and is joined based on the transmitting signal and local oscillation signal Signal is examined, and is mixed to obtain measuring signal based on the reflection signal and local oscillation signal；

Demodulating unit demodulates the reference signal and obtains detection data with the measuring signal；

The safe examination system further includes：

Processing module is connect with the demodulating unit, is based on the detection data, is obtained the vertical direction of the body to be detected Section scanning figure,

Wherein, the local oscillation signal is generated by the transceiver.

4. system according to claim 3, which is characterized in that the processing module：

The different detection datas of different moments, obtain the body to be detected when passing through the safe examination system based on the body to be detected Vertical direction multiple section scanning figures；And

Based on the multiple section scanning figure, the 3-D view of the body to be detected is synthesized.

5. system according to claim 2, it is characterised in that：

The array antenna includes linear array array antenna；And/or

The arrangement mode of the array antenna includes sparse arrangement.

6. system according to claim 2, it is characterised in that：

The array antenna includes multiple transmitting antennas and multiple reception antennas；

The transmitting-receiving subassembly further includes electronic switch, for switching opening for the multiple transmitting antenna and the multiple reception antenna It closes.

7. system according to claim 2, which is characterized in that the optical module include cylindrical lens or based on cylinder it is anti- The Quasi optics for penetrating face, to reflect the fan-shaped beam that the detection signal forms vertical direction.

8. system according to claim 2, which is characterized in that the optical module includes at least one cylindrical lens：

At least one cylindrical lens is placed in the emitting facet of at least one transmitting antenna, and at least one hair Antenna is penetrated to become one；And/or

At least one cylindrical lens is placed in the reception end face of at least one reception antenna, and described is connect at least one Antenna is received to become one.

9. system according to claim 2, which is characterized in that the transceiver includes that millimeter-wave transceiver or Terahertz are received Send out device.

10. system according to claim 1, which is characterized in that the safe examination system further includes that conveyer belt and conveyer belt drive Dynamic motor, the conveyer belt can at the uniform velocity transmit the body to be detected under the driving of the belt-driven motor.