Local multi-transmit multi-receive antenna array, real-time imaging system and real-time security inspection device

Abstract

The present application relates to a local multi-transmit and multi-receive antenna array, a real-time imaging system and a real-time security inspection device, wherein the antenna array includes: a plurality of transmitting antenna modules, a plurality of receiving antenna modules and a light wave transceiver, wherein the plurality of transmitting antenna modules and the plurality of receiving antenna modules are respectively connected to the light wave transceiver, and the plurality of transmitting antenna modules and the plurality of receiving antenna modules are arranged at intervals in a straight line. The light wave transceiver is used to generate a first light wave beam, the transmitting antenna module is used to transmit the first light beam, the first light beam is reflected by the target to be measured to form a second light beam, and the light wave transceiver is also used to control the receiving antenna module adjacent to the transmitting antenna module to receive the second light beam. The use of the above-mentioned local multi-transmit and multi-receive antenna array, the real-time imaging system and the real-time security inspection device can obtain more comprehensive image information of the target to be measured, and improve the image clarity of the imaging system.

Description

Technical Field

[0001] The present application relates to the field of imaging technology, and in particular to a local multi-transmit and multi-receive antenna array, a real-time imaging system and a real-time security inspection device. Background Art

[0002] With the development of real-time imaging technology, various antenna arrays have emerged to provide scanning optical beams for imaging systems. There are two main types of antenna arrays: single-transmit single-receive antenna arrays and multi-transmit multi-receive antenna arrays.

[0003] In a single-transmit single-receive antenna array, the light beam emitted by the transmitting antenna contains light at multiple angles. After a single reflection by the target object, the light beam will form reflected light beams at multiple angles, while the receiving antenna corresponding to the transmitting antenna can only receive reflected light beams at specific angles. This causes the light beam received by the receiving antenna to lose some target information, and the image formed by the imaging system is incomplete and unclear. The more complex the surface of the target object, the more obvious the shortcomings of the single-transmit single-receive antenna array.

[0004] Compared with a single-transmit single-receive antenna array, a multi-transmit multi-receive antenna array can overcome the shortcoming that a receiving antenna can only receive a single-reflected light beam at a specific angle. However, in the traditional multi-transmit multi-receive antenna array technology, a global multi-transmit multi-receive mode is adopted, that is, the light beam emitted by each transmitting antenna is reflected by the target object and then received by all receiving antennas. This results in the light beam received by the receiving antenna including light waves reflected multiple times by the target object and other clutter in the environment. For example, after a beam of light is irradiated onto the right hand of the target object, it is reflected onto the left chest of the target object, and then reflected onto the left arm of the target object, and finally reflected by the left arm of the target object and received by the receiving antenna. This light beam is a light beam reflected multiple times by the target object. The multi-reflected light beam does not conform to the imaging model based on a single reflection. When imaging is performed based on the multi-reflected light beam, artifacts will be reconstructed in places where there is no target object, which will reduce the imaging quality of the imaging system. Summary of the invention

[0005] Based on this, it is necessary to provide a local multi-transmit and multi-receive antenna array, a real-time imaging system and a real-time security inspection device that enable the imaging system to clearly image complex targets to be measured in order to solve the above technical problems.

[0006] In a first aspect, the present application provides a local multiple-transmit multiple-receive antenna array. The local multiple-transmit multiple-receive antenna array comprises: a plurality of transmitting antenna modules (102), a plurality of receiving antenna modules (104) and an optical wave transceiver (106);

[0007] The plurality of transmitting antenna modules (102) and the plurality of receiving antenna modules (104) are respectively connected to the optical wave transceiver (106), and the plurality of transmitting antenna modules (102) and the plurality of receiving antenna modules (104) are arranged in a straight line at intervals;

[0008] The optical wave transceiver (106) is used to generate a first optical wave beam, the transmitting antenna module (102) is used to transmit the first optical wave beam, and the first optical wave beam is reflected by the target to be measured to form a second optical wave beam;

[0009] The optical wave transceiver (106) is also used to control the receiving antenna module (104) adjacent to the transmitting antenna module (102) to receive the second optical wave beam.

[0010] In one embodiment, the optical wave transceiver (106) is further used to perform signal processing on the second optical wave beam to obtain echo data.

[0011] In one embodiment, the transmitting antenna module (102) includes: a plurality of transmitting antennas (1022) and a plurality of transmitting electronic switches (1024);

[0012] One end of each of the transmitting electronic switches (1024) is connected to a transmitting antenna (1022), and the other end of each of the transmitting electronic switches (1024) is connected to the optical wave transceiver (106);

[0013] The plurality of transmitting antennas (1022) are arranged at equal distances on the straight line;

[0014] The distance between the transmitting antennas (1022) is greater than the aperture of the transmitting antenna (1022).

[0015] In one embodiment, the receiving antenna module (104) includes: a plurality of receiving antennas (1042) and a plurality of receiving electronic switches (1044);

[0016] One end of each receiving electronic switch (1044) is connected to a receiving antenna (1042), and the other end of each receiving electronic switch (1044) is connected to the optical wave transceiver (106);

[0017] The plurality of receiving antennas (1042) are arranged at equal distances on the straight line;

[0018] The distance between the receiving antennas (1042) is greater than the aperture of the receiving antennas (1042).

[0019] In one embodiment, the optical wave transceiver (106) controls the receiving antenna module (104) adjacent to the transmitting antenna module (102) to receive the second optical wave beam, including:

[0020] The optical wave transceiver (106) is used to control the receiving antenna (1042) in the target receiving antenna module to receive the second optical wave beam through the receiving electronic switch (1044) in the target receiving antenna module, and the target receiving antenna module is a receiving antenna module (104) adjacent to the transmitting antenna module (102).

[0021] In a second aspect, the present application further provides a real-time imaging system, wherein the system comprises the local multi-transmit and multi-receive antenna array according to any one of the above embodiments.

[0022] In one embodiment, the system further comprises: a scanning device (402) and a data acquisition and processing system (404);

[0023] The data acquisition and processing system (404) is used to output a light wave control signal to the local multiple-transmit multiple-receive antenna array, and the local multiple-transmit multiple-receive antenna array is used to transmit the first light wave beam in response to the light wave control signal;

[0024] The data acquisition and processing system (404) is further used to output a scanning control signal to the scanning device (402), and the scanning device (402) is used to periodically swing in response to the scanning control signal to control the first light beam to irradiate various parts of the target to be measured;

[0025] The local multi-transmit and multi-receive antenna is further used to perform signal processing on a second optical beam to obtain echo data, where the second optical beam is an optical beam obtained by reflection after the first optical beam irradiates the target to be measured;

[0026] The data acquisition and processing system (404) is also used to receive echo data corresponding to any part of the target to be measured output by the local multi-transmit multi-receive antenna array, obtain an image of any part of the target to be measured based on the echo data, and reconstruct the image of the target to be measured based on the images of each part of the target to be measured.

[0027] In one embodiment, the system further comprises a focusing component (406), wherein the focusing component (406) is used to converge the first light beam, and the converged first light beam is controlled by the scanning device (402) to irradiate the target to be measured;

[0028] The focusing component (406) is also used to converge the second optical beam, and the converged second optical beam is received by the local multi-transmit and multi-receive antenna array.

[0029] In one embodiment, the scanning device (402) includes: a control unit (502), a motor (504) and a reflective optical device (506);

[0030] The control unit (502) is connected to the motor (504), the reflective optical device (506) and the data acquisition and processing system (108) respectively, and is used to control the swing of the reflective optical device (506) according to the scanning control signal, so that the first light beam irradiates various parts of the target to be measured;

[0031] The motor (504) is used to power the reflective optical device (506);

[0032] The reflective optical device (506) is used to reflect the first light beam so that the first light beam illuminates the target to be measured.

[0033] In a third aspect, the present application further provides a real-time security inspection device, which includes the real-time imaging system described in any one of the above embodiments.

[0034] The above-mentioned local multi-transmit and multi-receive antenna array, real-time imaging system and real-time security inspection device, the antenna array includes: multiple transmitting antenna modules, multiple receiving antenna modules and a light wave transceiver, wherein the multiple transmitting antenna modules and the multiple receiving antenna modules are respectively connected to the light wave transceiver, and the multiple transmitting antenna modules and the multiple receiving antenna modules are arranged at intervals in a straight line. The light wave transceiver is used to generate a first light wave beam, the transmitting antenna module is used to transmit the first light beam, the first light beam is reflected by the target to be measured to form a second light beam, and the light wave transceiver is also used to control the receiving antenna module adjacent to the transmitting antenna module to receive the second light beam. Based on the local multi-transmit and multi-receive antenna array, real-time imaging system and real-time security inspection device provided in the embodiments of the present application, the second light beam of each transmitting antenna module can be received by multiple receiving antenna modules adjacent to the transmitting antenna module, thereby improving the angular coverage range of the light beam that can be received by the receiving antenna module, and increasing the probability that the first light beam emitted by the transmitting antenna module is received by the receiving antenna module after being reflected by the target at multiple angles, thereby alleviating the phenomenon that the light beam received by the receiving antenna module loses part of the information of the target to be measured. Therefore, more comprehensive image information of the target to be measured can be obtained, and the receiving antenna module only receives the second light beam of the adjacent transmitting antenna module, and the light beam after being reflected multiple times by the target to be measured will mostly deviate from the transmitting antenna module that emits the light beam, so that the light waves received by the receiving antenna module after being reflected multiple times by the target to be measured are reduced, thereby reducing the crosstalk between the multiple reflected light waves and other clutter in the environment, and improving the image clarity of the imaging system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the structure of a local multi-transmit multi-receive antenna array provided in one embodiment of the present application;

[0036] Figure 2a A schematic diagram of parameters of a transmitting antenna module and a receiving antenna module provided in an embodiment of the present application;

[0037] Figure 2b A schematic diagram of parameters of a transmitting antenna module and a receiving antenna module provided in another embodiment of the present application;

[0038] Figure 3a A schematic diagram of parameters of a transmitting antenna module and a receiving antenna module provided in another embodiment of the present application;

[0039] Figure 3b A schematic diagram of parameters of a transmitting antenna module and a receiving antenna module provided in another embodiment of the present application;

[0040] Figure 4 A schematic diagram of the structure of a real-time imaging system provided in one embodiment of the present application;

[0041] Figure 5 A schematic diagram of the structure of a scanning device provided in one embodiment of the present application;

[0042] Figure 6 A simulation test result of a real-time imaging system provided in an embodiment of the present application;

[0043] Figure 7 A schematic diagram of the structure of a real-time security inspection device provided in one embodiment of the present application;

[0044] Figure 8 A schematic structural diagram of a real-time security inspection device provided in another embodiment of the present application.

[0045] Description of Reference Numerals

[0046] Local multiple-transmit and multiple-receive antenna array 10, transmitting antenna module 102, receiving antenna module 104, optical wave transceiver 106, transmitting antenna 1022, transmitting electronic switch 1024, receiving antenna 1042, receiving electronic switch 1044, real-time imaging system 40, scanning device 402, data acquisition and processing system 404, focusing component 406, control unit 502, motor 504, and reflective optical device 506. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0048] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of this application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0049] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] See also Figure 1 , the embodiment of the present application provides a local multiple-transmit multiple-receive antenna array, the local multiple-transmit multiple-receive antenna array includes: multiple transmitting antenna modules 102, multiple receiving antenna modules 104 and an optical wave transceiver 106;

[0051] The plurality of transmitting antenna modules 102 and the plurality of receiving antenna modules 104 are respectively connected to the optical wave transceiver 106, and the plurality of transmitting antenna modules 102 and the plurality of receiving antenna modules 104 are arranged in a straight line at intervals;

[0052] The optical wave transceiver 106 is used to generate a first optical wave beam, and the transmitting antenna module 102 is used to transmit the first optical wave beam, and the first optical wave beam is reflected by the target to be measured to form a second optical wave beam;

[0053] The optical wave transceiver 106 is further configured to control the receiving antenna module 104 adjacent to the transmitting antenna module 102 to receive the second optical wave beam.

[0054] In the embodiment of the present application, a plurality of transmitting antenna modules 102 and a plurality of receiving antenna modules 104 are arranged in a straight line at intervals.

[0055] There are many ways of spacing the antennas, for example: n (n≥1, and n is a positive integer) receiving antenna modules 104 are arranged between every two transmitting antenna modules 102; or n (n≥1, and n is a positive integer) transmitting antenna modules 102 are arranged between every two receiving antenna modules 104, wherein the number of n receiving antenna modules 104 arranged between every two transmitting antenna modules 102 may be the same or different, and similarly, the number of n transmitting antenna modules 102 arranged between every two receiving antenna modules 104 may be the same or different, and this is not specifically limited in the embodiments of the present application.

[0056] For example, multiple transmitting antenna modules 102 and multiple receiving antenna modules 104 may be arranged at regular intervals of 1 transmitting antenna module - 1 receiving antenna module - 1 transmitting antenna module - 1 receiving antenna module..., or may be arranged at regular intervals of 1 transmitting antenna module - 2 receiving antenna modules - 1 transmitting antenna module - 2 receiving antenna modules..., or may also be arranged at regular intervals of 1 receiving antenna module - 2 transmitting antenna modules - 1 receiving antenna module - 2 transmitting antenna modules...

[0057] It should be noted that the above example is only an example of the manner in which multiple transmitting antenna modules 102 and multiple receiving antenna modules 104 are arranged in a straight line at intervals in the embodiment of the present application, and is not to be understood as a limitation on the manner in which multiple transmitting antenna modules 102 and multiple receiving antenna modules 104 are arranged in a straight line at intervals. In fact, in the embodiment of the present application, there is no specific limitation on the manner in which multiple transmitting antenna modules 102 and multiple receiving antenna modules 104 are arranged in a straight line at intervals, and any interval arrangement manner is applicable to the embodiment of the present application.

[0058] In the embodiment of the present application, the first light beam represents the light beam emitted by the local multiple-transmit multiple-receive antenna array. In the local multiple-transmit multiple-receive antenna array, the lightwave transceiver 106 is used to generate the first light beam, and the transmitting antenna module is used to emit the first light beam. After that, the first light beam propagates in the air until it irradiates the corresponding part of the target to be measured. The first light beam after a single reflection by the target to be measured is represented as the second light beam, wherein the second light beam contains image information of the above-mentioned corresponding part in the target to be measured. After that, after the second light beam is fed back to the receiving antenna module 104 adjacent to the transmitting antenna module 102, the adjacent receiving antenna module 104 will receive the second light beam; or, when the second light beam is fed back to the receiving antenna module 104 not adjacent to the transmitting antenna module 102, the non-adjacent receiving antenna module 104 will not receive the second light beam.

[0059] In the embodiment of the present application, the optical wave transceiver 106 controls the working mode of the receiving antenna module 104. The working mode of the receiving antenna module 104 includes a working state and a non-working state. When the receiving antenna module 104 is in the working state, the second optical beam fed back to the receiving antenna module 104 can be received by the receiving antenna module 104; and when the receiving antenna module 104 is in the non-working state, the second optical beam fed back to the receiving antenna module 104 cannot be received by the receiving antenna module 104. When the transmitting antenna module 102 is in the working state, the optical wave transceiver 106 controls the receiving antenna module 104 adjacent to the transmitting antenna module 102 to make the receiving antenna module 104 adjacent to the transmitting antenna module 102 in the working state, so that only the receiving antenna module adjacent to the transmitting antenna module 102 receives the second optical beam. Among them, the receiving antenna module 104 on both sides of the transmitting antenna module 102 and closest to the transmitting antenna module 102 can be determined as the receiving antenna module 104 adjacent to the transmitting antenna module 102.

[0060] Exemplarily, the arrangement pattern of multiple transmitting antenna modules 102 and multiple receiving antenna modules 104 in a local multi-transmitting and multi-receiving antenna array is: receiving antenna module 1-transmitting antenna module 1-receiving antenna module 2-transmitting antenna module 2-receiving antenna module 3. Taking transmitting antenna module 1 as an example, the receiving antenna modules adjacent to the transmitting antenna module 1 include: receiving antenna module 1 and receiving antenna module 2. That is, when this local multi-transmitting and multi-receiving antenna array is operating normally, the first light beam emitted by the transmitting antenna module 1 is reflected by the target to be measured, and the second light beam formed can only be received by the receiving antenna module 1 and the receiving antenna module 2 adjacent to the transmitting antenna module 1.

[0061] Exemplarily, the arrangement pattern of multiple transmitting antenna modules 102 and multiple receiving antenna modules 104 in the local multi-transmitting and multi-receiving antenna array is: receiving antenna module 1-transmitting antenna module 1-transmitting antenna module 2-receiving antenna module 2. Taking transmitting antenna module 1 as an example, the receiving antenna modules adjacent to the transmitting antenna module 1 include: receiving antenna module 1 and receiving antenna module 2. Taking transmitting antenna module 2 as an example, the receiving antenna modules adjacent to the transmitting antenna module 2 include: receiving antenna module 1 and receiving antenna module 2. That is, when this local multi-transmitting and multi-receiving antenna array is operating normally, the first light beam emitted by the transmitting antenna module 1 and the transmitting antenna module 2 is reflected by the target to be measured, and the formed second light beam can only be received by the receiving antenna module 1 and the receiving antenna module 2 adjacent to the transmitting antenna module 1.

[0062] In the above-mentioned local multiple-transmit and multiple-receive antenna array, the second light beam corresponding to each transmitting antenna module 102 can be received by multiple receiving antenna modules 104 adjacent to the transmitting antenna module 102, thereby improving the angular coverage range of the light beam that can be received by the receiving antenna module 104, and increasing the probability that the first light beam emitted by the transmitting antenna module 102 is received by the receiving antenna module 104 after being reflected by the target at multiple angles, thereby alleviating the phenomenon that the light beam received by the receiving antenna module 104 loses part of the information of the target to be measured. Therefore, more comprehensive image information of the target to be measured can be obtained, and the receiving antenna module 104 only receives the second light beam of the adjacent transmitting antenna module 102, and the light beam after being reflected by the target to be measured for multiple times will mostly deviate from the transmitting antenna module 102 that emits the light beam, so that the light waves received by the receiving antenna module 104 after being reflected by the target to be measured for multiple times are reduced, thereby reducing the crosstalk between the multiple reflected light waves and other clutter in the environment, and improving the image clarity of the imaging system.

[0063] In one embodiment, the optical wave transceiver 106 is further used to perform signal processing on the second optical wave beam to obtain echo data.

[0064] In the embodiment of the present application, the second optical wave beam received by the receiving antenna module 104 contains image information of the target to be measured, and the optical wave transceiver 106 performs signal processing on the received second optical beam to obtain echo data containing the image information of the target to be measured. Thereafter, other devices can be used to process the echo data to obtain the image information of the target to be measured, and then reconstruct the image of the target to be measured. In the above-mentioned signal processing process of the second light beam, the lightwave transceiver 106 may adopt different signal processing methods for the second light beam according to different bands of the transmitted light beam. For example, when the local multi-transmit multi-receive antenna array works in the millimeter wave band, the lightwave transceiver 106 may adopt heterodyne mixing technology to perform signal processing on the second light beam. At this time, the lightwave transceiver 106 includes a transmission signal and a local oscillator signal. The transmitting antenna module 102 receives the transmission signal after frequency doubling and power amplification, and transmits a first light beam according to the transmission signal after frequency doubling and power amplification. The first light beam is reflected by the target to be measured to form a second light beam. The receiving antenna module 104 receives the second light beam, that is, the lightwave transceiver 106 receives the light signal of the second light beam, and mixes the light signal of the second light beam with the local oscillator signal to obtain a measurement signal. At the same time, the transmission signal is mixed with the local oscillator signal to obtain a reference signal. The measurement signal and the reference signal are I / Q demodulated to obtain holographic data, that is, echo data containing image information of the target to be measured.

[0065] In the embodiment of the present application, the receiving antenna module 104 only receives the second optical wave beam of the adjacent transmitting antenna module 102, thereby reducing the crosstalk of multiple reflected light waves and other clutter in the environment, so that the optical wave transceiver 106 performs signal processing on the received second optical beam, and in the obtained echo data, the image information of the target to be measured is more comprehensive and the influence of useless information is reduced.

[0066] See also Figure 1 As shown, in one embodiment, the transmit antenna module 102 includes: a plurality of transmit antennas 1022 and a plurality of transmit electronic switches 1024;

[0067] One end of each transmitting electronic switch 1024 is connected to a transmitting antenna 1022, and the other end of each transmitting electronic switch 1024 is connected to the optical wave transceiver 106;

[0068] Multiple transmitting antennas 1022 are arranged at equal distances on a straight line;

[0069] The distance between the transmitting antennas 1022 is greater than the aperture of the transmitting antenna 1022 .

[0070] In the embodiment of the present application, the transmitting antenna module 102 also includes multiple transmitting antennas 1022 and multiple transmitting electronic switches 1024, wherein one end of each transmitting electronic switch 1024 is connected to a transmitting antenna 1022, and the other end of each transmitting electronic switch 1024 is connected to the optical wave transceiver 106, that is, each transmitting electronic switch 1024 corresponds to a transmitting antenna 1022, and the operation of each transmitting antenna 1022 is controlled by controlling the closing or opening of the transmitting electronic switch 1024.

[0071] Furthermore, in the transmitting antenna module 102 , a plurality of transmitting antennas 1022 are arranged at equal distances on a straight line, and a distance between every two transmitting antennas 1022 is greater than a diameter of the transmitting antenna 1022 .

[0072] In the embodiment of the present application, the transmitting antenna module 102 includes multiple transmitting antennas 1022. In the multi-transmit and multi-receive mode based on the local multi-transmit and multi-receive antenna array, compared with the single-receive and single-transmit mode, the number of transmitting antennas 1022 required in the transmitting antenna module 102 is reduced, and a sparse arrangement can be adopted. Therefore, the transmitting antenna module has a broader design space, and users can flexibly design the transmitting antenna and the arrangement of the transmitting antenna module according to their own needs.

[0073] See also Figure 1 As shown, in one embodiment, the receiving antenna module 104 includes: a plurality of receiving antennas 1042 and a plurality of receiving electronic switches 1044;

[0074] One end of each receiving electronic switch 1044 is connected to a receiving antenna 1042, and the other end of each receiving electronic switch 1044 is connected to the optical wave transceiver 106;

[0075] Multiple receiving antennas 1042 are arranged at equal distances on a straight line;

[0076] The distance between the receiving antennas 1042 is greater than the aperture of the receiving antenna 1042 .

[0077] In the embodiment of the present application, the receiving antenna module 104 includes a plurality of receiving antennas 1042 and a plurality of receiving electronic switches 1044, wherein one end of each receiving electronic switch 1044 is connected to a receiving antenna 1042, and the other end of each receiving electronic switch 1044 is connected to the optical wave transceiver 106. Each receiving electronic switch 1044 corresponds to a receiving antenna 1042, and the operation of each receiving antenna 1042 is controlled by controlling the closing or opening of the receiving electronic switch 1044.

[0078] Furthermore, in the receiving antenna module 104 , a plurality of receiving antennas 1042 are arranged at equal distances in a straight line direction, and a distance between every two receiving antennas 1042 is greater than a diameter of the receiving antenna 1042 .

[0079] In an embodiment of the present application, the receiving antenna module 104 includes multiple receiving antennas 1042. In the multi-transmit and multi-receive mode based on the local multi-transmit and multi-receive antenna array, compared with the single-receive and single-transmit mode, the number of receiving antennas 1042 required in the receiving antenna module 104 is reduced, and a sparse arrangement can be adopted. Therefore, the receiving antenna module has a broader design space, and the user can flexibly design the receiving antenna and the arrangement of the receiving antenna module according to their own needs.

[0080] In one embodiment, the specific arrangement of the local multi-transmit multi-receive antenna array is as follows: Figure 2a and Figure 2b As shown, the interval between the transmitting antennas in the transmitting antenna module 102 is dt, the number of transmitting antennas is nt, the length of the transmitting antenna module 102 is nt*dt=Lt, the half angle of the light beam transmitted by the transmitting antenna 1022 is θt, the interval between the receiving antennas in the receiving antenna module 104 is dr, the number of receiving antennas is nr, the length of the receiving antenna module 104 is nr*dr=Lr, the half angle of the light beam received by the receiving antenna 1042 is θr, the distance between the local multi-transmitting and multi-receiving antenna array and the target to be measured (i.e., the imaging distance) is Z, and the above parameters should also meet the following conditions:

[0081] (1) Considering a receiving antenna module 104 and an adjacent transmitting antenna module 102 as a combination, in order to make the local multiple-transmitting and multiple-receiving antenna array satisfy the Nyquist sampling theorem, point a is the center point of the line connecting the leftmost transmitting antenna and the leftmost receiving antenna in the combination, and point b is the center point of the line connecting the rightmost transmitting antenna and the rightmost receiving antenna in the combination (refer to Figure 2a and Figure 3a As shown), the distance between point a and point b is the sampling distance, and the sampling distance is divided by λ / 2 to obtain the number of sampling points. Any receiving antenna 1042 and any transmitting antenna 1022 in the combination can be used as an antenna combination. The number of sampling points in the combination needs to be less than or equal to the total number of antenna combinations in the combination. When the receiving antenna module 104 has two adjacent transmitting antenna modules 102, the total number of antenna combinations is 2*nt*nr, that is, any combination in the local multi-transmitting and multi-receiving antenna array needs to satisfy (Lt+Lr) / (λ / 2)≤2*nt*nr, where λ is the operating wavelength of the local multi-transmitting and multi-receiving antenna array; when the receiving antenna module 104 has only one adjacent transmitting antenna module 102, the total number of antenna combinations is nt*nr, that is, any combination in the local multi-transmitting and multi-receiving antenna array needs to satisfy (Lt / 2+Lr / 2) / (λ / 2)≤nt*nr.

[0082] (2) The beam coverage of the receiving antenna module 104 and the transmitting antenna 1022 and the receiving antenna 1042, which are the farthest apart from each other in the adjacent transmitting antenna module 102, need to overlap (refer to Figure 2b and Figure 3b As shown), the optical beam emitted by the transmitting antenna module 102 can be completely received by the adjacent receiving antenna module 104 after a single reflection by the target to be measured, that is, any receiving antenna module 104 and its adjacent transmitting antenna module 102 in the local multiple-transmit and multiple-receive antenna array must satisfy Z*tan(θt)+Z*tan(θr)>(Lt+Lr).

[0083] In one embodiment, the specific arrangement of the local multi-transmit multi-receive antenna array can also be as follows: Figure 3a and Figure 3b As shown, the multiple transmitting antenna modules 102 arranged between any two receiving antenna modules 104 are all regarded as transmitting antenna modules 102 adjacent to the two receiving antenna modules 104. In this arrangement mode, the two transmitting antenna modules 102 on the left, the one receiving antenna module 104 in the middle and the one transmitting antenna module 102 on the right are regarded as a combination, and the parameters of the local multi-transmitting and multi-receiving antenna array should meet the following requirements:

[0084] (1)(Lt+Lr+Lt / 2) / (λ / 2)≤3*nt*nr

[0085] (2)Z*tan(θt)+Z*tan(θr)>(Lt+Lt+Lr)

[0086] In an embodiment of the present application, the length of the transmitting antenna module can be changed by adjusting the aperture of the transmitting antenna, the spacing between the transmitting antennas, and the number of transmitting antennas. Similarly, the length of the receiving antenna module can be changed by adjusting the aperture of the receiving antenna, the spacing between the receiving antennas, and the number of receiving antennas. The spacing arrangement of the transmitting antenna modules and the receiving antenna modules in the local multiple-transmit and multiple-receive antenna array can be flexibly designed according to the length of the transmitting antenna module and the length of the receiving antenna module, thereby improving the design space of the local multiple-transmit and multiple-receive antenna array.

[0087] In one embodiment, the optical wave transceiver 106 controls the receiving antenna module 104 adjacent to the transmitting antenna module 102 to receive the second optical wave beam, including:

[0088] The optical wave transceiver 106 is used to control the receiving antenna 1042 in the target receiving antenna module to receive the second optical wave beam through the receiving electronic switch 1044 in the target receiving antenna module, and the target receiving antenna module is the receiving antenna module 104 adjacent to the transmitting antenna module 102 .

[0089] In the embodiment of the present application, the optical wave transceiver 106 controls the receiving antenna 1042 in the target receiving antenna module to receive the second optical wave beam through the receiving electronic switch 1044 in the target receiving antenna module, and the target receiving antenna module is the receiving antenna module 104 adjacent to the transmitting antenna module 102. When the local multiple-transmitting and multiple-receiving antenna array is working, the multiple transmitting electronic switches 1024 corresponding to the multiple transmitting antennas 1022 in the transmitting antenna module 102 are closed. At this time, the multiple transmitting antennas 1022 transmit the first optical wave beam, and the transmitting antenna module 102 is in a working state. At the same time, the optical wave transceiver 106 controls the multiple receiving electronic switches 1044 corresponding to the multiple receiving antennas 1042 in the target receiving antenna module adjacent to the transmitting antenna module 102 to be closed, so that the target receiving antenna module adjacent to the transmitting antenna module 102 is in a working state and receives the second optical wave beam.

[0090] Exemplarily, still taking the above example, when the transmitting antenna module 1 transmits the first optical wave beam, the optical wave transceiver 106 controls the receiving electronic switch 1044 in the receiving antenna module 1 and the receiving antenna module 2 to close, so that the second optical beam formed by the first optical beam emitted by the transmitting antenna module 1 after being reflected by the target to be measured is only received by the adjacent receiving antenna module 1 and the receiving antenna module 2.

[0091] In the embodiments of the present application, it should be noted that the embodiments do not specifically limit the working mode of the local multiple-transmit multiple-receive antenna array, wherein each transmitting antenna 1022 in the local multiple-transmit multiple-receive antenna array transmits a first optical beam at a certain time interval, or each transmitting antenna 1022 in the local multiple-transmit multiple-receive antenna array transmits a first optical beam at a certain time interval, or the frequencies of the first optical beams emitted by each transmitting antenna 1022 in the local multiple-transmit multiple-receive antenna array are different.

[0092] Still taking the above example, when each transmitting antenna transmits a first optical beam at a certain time interval, assuming that the time interval is 1ns, at 1ns, the optical wave transceiver 106 controls the transmitting antenna module 1, the receiving antenna module 1 and the receiving antenna module 2 to work, and the other antenna modules do not work. At 2ns, the optical wave transceiver 106 controls the transmitting antenna module 2, the receiving antenna module 2 and the receiving antenna module 3 to work, and the other antenna modules do not work. When the frequencies of the first optical beams emitted by each transmitting antenna are different, the transmitting antenna module and the receiving antenna module can work at the same time. For example, at the same time, the transmitting antenna module 1 emits an optical beam with a frequency of 70GHz. At this time, the receiving antenna module 1 and the receiving antenna module 2 receive an optical beam with a frequency of 70GHz, the transmitting antenna 2 emits an optical beam with a frequency of 75GHz, and the receiving antenna module 2 and the receiving antenna module 3 receive an optical beam with a frequency of 75GHz.

[0093] In the embodiment of the present application, an electronic switch is used to control whether the transmitting antenna and the receiving antenna are working or not. The electronic switch reacts quickly and sensitively, and can improve the working speed of the local multiple-transmitting and multiple-receiving antenna array. The optical beam emitted by a transmitting antenna module can be received by multiple adjacent receiving antenna modules. Each transmitting antenna module and receiving antenna module includes multiple antennas, and multiple optical beams can be emitted each time. A smaller number of beam emissions can be used to scan the target to be measured, thereby improving the scanning speed.

[0094] In one embodiment, a real-time imaging system is provided, comprising the local multi-transmit and multi-receive antenna array described in any one of the above embodiments.

[0095] In the embodiment of the present application, the structure and working principle of the local multi-transmitting and multi-receiving antenna array can refer to the relevant description of the above embodiment, and will not be repeated in the embodiment of the present application. The real-time imaging system can obtain the image of the target to be measured according to the echo data generated after the local multi-transmitting and multi-receiving antenna array scans the target to be measured. By using the local multi-transmitting and multi-receiving antenna array to scan the target to be measured, more comprehensive image information of the target to be measured can be obtained, and the crosstalk of multiple reflected light waves and other clutter in the environment is reduced, thereby improving the image clarity of the imaging system. At the same time, for the local multi-transmitting and multi-receiving antenna array, the receiving antenna module 104 only receives the second light beam of the adjacent transmitting antenna module 102. During near-field imaging, compared with the imaging index of the global multi-transmitting and multi-receiving antenna array, the imaging index of the local multi-transmitting and multi-receiving antenna array is more similar to the imaging index of its equivalent single-transmitting and single-receiving antenna array, so that the fast imaging algorithm for the single-transmitting and single-receiving antenna array can be directly used to image the local multi-transmitting and multi-receiving antenna array, thereby improving the imaging speed of the real-time imaging system.

[0096] See also Figure 4 As shown, in one embodiment, the system further includes: a scanning device 402 and a data acquisition and processing system 404;

[0097] The data acquisition and processing system 404 is used to output an optical wave control signal to the local multiple-transmitting and multiple-receiving antenna array, and the local multiple-transmitting and multiple-receiving antenna array is used to transmit the first optical wave beam in response to the optical wave control signal;

[0098] The data acquisition and processing system 404 is further used to output a scanning control signal to the scanning device 402, and the scanning device 402 is used to periodically swing in response to the scanning control signal to control the first light beam to irradiate various parts of the target to be measured;

[0099] The local multi-transmit and multi-receive antenna array is also used to perform signal processing on the second light beam to obtain echo data, where the second light beam is a light beam obtained by reflecting the target to be measured after the first light beam irradiates the target;

[0100] The data acquisition and processing system 404 is also used to receive echo data corresponding to any part of the target to be measured output by the local multi-transmit multi-receive antenna array, obtain an image of any part of the target to be measured based on the echo data, and reconstruct the image of the target to be measured based on the images of each part of the target to be measured.

[0101] In an embodiment of the present application, when scanning a target to be measured, the data acquisition and processing system 404 will output a light wave control signal to the local multiple-transmit and multiple-receive antenna array, and the local multiple-transmit and multiple-receive antenna array will emit a first light wave beam according to the light wave control signal. At the same time, the data acquisition and processing system 404 outputs a scanning control signal to the scanning device 402 to control the scanning device 402 to swing periodically at a certain speed. After that, when the first light wave beam propagates in the air to the scanning device 402, the scanning device 402 can reflect the first light beam at a certain angle so that the first light beam illuminates various parts of the target to be measured to scan the target to be measured. Exemplarily, the scanning device swings periodically at a speed of 5° / ms from an initial position.

[0102] Afterwards, a second light beam formed after reflection by the target to be measured is received by the local multiple-transmit multiple-receive antenna array, and the local multiple-transmit multiple-receive antenna array performs signal processing on the second light beam to obtain echo data, wherein the first light beam emitted by the local multiple-transmit multiple-receive antenna array is scanned once by the scanning device on a part of the target to be measured, and a set of corresponding echo data can be obtained.

[0103] Finally, the data acquisition and processing system 404 receives the echo data corresponding to any part of the target to be measured output by the local multi-transmit and multi-receive antenna array, and obtains a two-dimensional image of any part of the target to be measured based on the echo data. After the data acquisition and processing system 404 obtains the images of all parts of the target to be measured, it reconstructs the overall three-dimensional image of the target to be measured based on the images of each part.

[0104] In the embodiment of the present application, a local multi-transmitter and multi-receiver antenna array is used to provide a scanning light beam for the real-time imaging system, so that more comprehensive image information of the target to be measured can be obtained, and the crosstalk of multiple reflected light waves and other clutter in the environment is reduced, thereby improving the image clarity of the imaging system. At the same time, the scanning device can make the first light beam irradiate various parts of the target to be measured, and each time a scan of a part of the target to be measured is completed, the data acquisition and processing system will immediately process the echo data corresponding to the part, thereby obtaining real-time images of various parts of the target to be measured, so that the target to be measured does not need to remain still when real-time imaging is performed on the target to be measured.

[0105] See also Figure 4 As shown, in one embodiment, the system further includes a focusing component 406, and the focusing component 406 is used to converge the first light beam, and the converged first light beam is controlled by the scanning device 402 to irradiate the target to be measured;

[0106] The focusing component 406 is also used to converge the second optical beam, and the converged second optical beam is received by the local multi-transmit and multi-receive antenna array.

[0107] In the embodiment of the present application, the central axes of the multiple transmitting antenna modules 102 and the multiple receiving antenna modules 104 in the local multi-transmit multi-receive antenna array should be aligned with the central axis of the focusing component 406 so that the focusing component 406 can better converge the first light beam and the second light beam.

[0108] In one embodiment, the focusing assembly may include one of a hyperbolic cylindrical lens, an aspherical cylindrical lens, a conical cylindrical lens, or a quasi-optical system.

[0109] In an embodiment of the present application, the focusing component can converge the first light beam emitted by the local multiple-transmit and multiple-receive antenna array, and / or the second light beam formed after reflection by the target to be measured, and then focus the light beam into a fan beam or a strip beam. The focusing component can be used to control the angle of the light beam according to actual needs. The use of a local multiple-transmit and multiple-receive antenna array can obtain more comprehensive image information of the target to be measured, reduce the crosstalk of multiple reflected light waves and other clutter in the environment, and thus improve the image clarity of the imaging system.

[0110] See also Figure 5 As shown, in one embodiment, the scanning device 402 includes: a control unit 502, a motor 504, and a reflective optical device 506;

[0111] The control unit 502 is connected to the motor 504, the reflective optical device 506 and the data acquisition and processing system 108 respectively, and is used to control the swing of the reflective optical device 506 according to the scanning control signal, so that the first light beam irradiates various parts of the target to be measured;

[0112] The motor 504 is used to power the reflective optical device 506;

[0113] The reflective optical device 506 is used to reflect the first light beam so that the first light beam illuminates the target to be measured.

[0114] In the embodiment of the present application, the scanning device 402 includes a control unit 502, a motor 504 and a reflective optical device 506. The control unit 502 can control the periodic swing of the reflective optical device 506, and can also control the motor 504 so that the motor 504 provides electrical energy to the reflective optical device 506. Under the control of the control unit 502, the reflective optical device 506 can swing periodically so that the first light beam is reflected by itself and illuminates various parts of the target to be measured.

[0115] In the embodiment of the present application, the scanning device can make the first light beam irradiate various parts of the target to be measured, and each time a part of the target to be measured is scanned, the data acquisition and processing system will immediately process the echo data corresponding to the part, thereby obtaining images of various parts of the target to be measured in real time. In the real-time imaging system provided in the embodiment of the present application, the target to be measured does not need to remain still during the real-time imaging of the target to be measured.

[0116] In a specific embodiment, when the real-time imaging system 40 images the target to be measured, first, the data acquisition and processing system 404 outputs a light wave control signal to the local multiple-transmit multiple-receive antenna array 10, and the light wave transceiver 106 in the local multiple-transmit multiple-receive antenna array 10 generates a first light wave beam in response to the light wave control signal, and controls the multiple transmitting antenna modules 102 and the multiple receiving antenna modules 104 to work.

[0117] Among them, the optical wave transceiver 106 controls the multiple transmitting electronic switches in the transmitting antenna module 1 to be closed, so that the multiple transmitting antennas in the transmitting antenna module 1 transmit the first light beam. At this time, the deflection angle of the scanning device 402 is 15°. The first light beam propagates in the air to the scanning device 402, and is irradiated to the leftmost side of the target to be measured through the scanning device 402. The first light beam is reflected by the target to be measured to form a second light beam. Because the optical path is reversible, the second light beam returns to the local multi-transmitting and multi-receiving antenna array 10. The optical wave transceiver 106 controls the multiple receiving electronic switches in the receiving antenna module 1 and the receiving antenna module 2 adjacent to the transmitting antenna module 1 to be closed, so that the multiple receiving antennas in the receiving antenna module 1 and the receiving antenna module 2 receive the second light beam.

[0118] Because the local multiple-transmitting and multiple-receiving antenna array 10 transmits the first light beam at a time interval of 1 ns, after 1 ns, the lightwave transceiver 106 controls the transmitting electronic switches and receiving electronic switches corresponding to the transmitting antenna module 2, the receiving antenna module 2 and the receiving antenna module 3 to close, so that the transmitting antenna and the receiving antenna in the above antenna modules work normally, and the working process is still carried out according to the above process until all the transmitting antenna modules 102 in the local multiple-transmitting and multiple-receiving antenna array 10 have transmitted the first light beam, at which time, the scanning of the leftmost part of the target to be measured is completed. The lightwave transceiver 106 performs signal processing on the second light beam to obtain echo data, and the data acquisition and processing system 404 obtains an image of the leftmost part of the target to be measured based on the echo data.

[0119] Afterwards, the scanning device 402 enters the next angle, for example, 20°, at which time the local multi-transmitting and multi-receiving antenna array 10 will work according to the above process, so that the first light beam scans the middle of the target to be measured to obtain an image of the middle of the target to be measured. In the above manner, the real-time imaging system 40 scans various parts of the target to be measured and obtains images of various parts. Finally, the data acquisition and processing system 404 reconstructs a three-dimensional image of the target to be measured based on the two-dimensional images corresponding to each part.

[0120] In one embodiment, the real-time imaging system can be applicable to the millimeter wave band and the terahertz wave band.

[0121] In one embodiment, a simulation test is performed on a real-time imaging system in a millimeter wave band. In the test, a transmitting antenna module and a receiving antenna module of a local multi-transmitting and multi-receiving antenna array are arranged at intervals, and the local multi-transmitting and multi-receiving antenna module transmits millimeter waves and scans a T-shaped metal target. The simulation parameters of the real-time imaging system are shown in the following table:

[0122] Table 1 Simulation parameters

[0123] parameter MIMO Mode Center frequency 30GHz bandwidth 5GHz Frequency sampling interval 0.064GHz Number of transmitting antenna modules 2 Number of transmitting antennas 14 Receive antenna module data 2 Number of receiving antennas 14 Horizontal sampling range (-0.5m,0.5m) Array length 1m Imaging distance 1m

[0124] The imaging results of this simulation test are as follows: Figure 6 As shown in the figure, the left picture is a T-shaped metal plate, and the right picture is the imaging result obtained by imaging the T-shaped metal plate using the above real-time imaging system. The imaging results prove that the real-time imaging system can clearly image the target to be measured. At the same time, the number of transmitting and receiving antennas required for the local multi-transmitting and multi-receiving antenna array is greatly reduced, saving manufacturing costs.

[0125] See also Figure 7 As shown, in one embodiment, a real-time security inspection device is provided, comprising the real-time imaging system described in any one of the above embodiments. The real-time security inspection device comprises two real-time imaging systems, which are arranged on both sides of the security inspection area, and at the same time, the two real-time imaging systems are not completely opposite. When the target to be measured enters the security inspection area, the position trigger in the security inspection area is triggered. At this time, the two real-time imaging systems respectively perform three-dimensional imaging on the front and back of the target to be measured, thereby reconstructing an all-round image of the target to be measured.

[0126] See also Figure 8 As shown, in one embodiment, the real-time security inspection device includes a real-time imaging system. When the target to be inspected enters the security inspection area of ​​the real-time security inspection device, the real-time imaging system first images the front of the target to be inspected, and then the target to be inspected turns around according to the prompt, and the real-time imaging system then images the back of the target to be inspected to reconstruct a full-range three-dimensional image of the target to be inspected.

[0127] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A local multi-transmit multi-receive antenna array, characterized in that: include: A plurality of transmitting antenna modules (102), a plurality of receiving antenna modules (104) and an optical wave transceiver (106); The plurality of transmitting antenna modules (102) and the plurality of receiving antenna modules (104) are respectively connected to the optical wave transceiver (106), and the plurality of transmitting antenna modules (102) and the plurality of receiving antenna modules (104) are arranged in a straight line at intervals; The optical wave transceiver (106) is used to generate a first optical wave beam, the transmitting antenna module (102) is used to transmit the first optical wave beam, and the first optical wave beam is reflected by the target to be measured to form a second optical wave beam; The optical wave transceiver (106) is also used to control the receiving antenna module (104) adjacent to the transmitting antenna module (102) to receive the second optical wave beam; The transmitting antenna module (102) includes: a plurality of transmitting antennas (1022) and a plurality of transmitting electronic switches (1024); One end of each of the transmitting electronic switches (1024) is connected to a transmitting antenna (1022), and the other end of each of the transmitting electronic switches (1024) is connected to the optical wave transceiver (106); The plurality of transmitting antennas (1022) are arranged at equal distances on the straight line; The distance between the transmitting antennas (1022) is greater than the aperture of the transmitting antenna (1022).

2. The antenna array according to claim 1, characterized in that: The optical wave transceiver (106) is also used to perform signal processing on the second optical wave beam to obtain echo data.

3. The antenna array according to claim 1, characterized in that: The receiving antenna module (104) comprises: a plurality of receiving antennas (1042) and a plurality of receiving electronic switches (1044); One end of each receiving electronic switch (1044) is connected to a receiving antenna (1042), and the other end of each receiving electronic switch (1044) is connected to the optical wave transceiver (106); The plurality of receiving antennas (1042) are arranged at equal distances on the straight line; The distance between the receiving antennas (1042) is greater than the aperture of the receiving antennas (1042).

4. The antenna array according to claim 3, characterized in that: The optical wave transceiver (106) controls the receiving antenna module (104) adjacent to the transmitting antenna module (102) to receive the second optical wave beam, comprising: The optical wave transceiver (106) is used to control the receiving antenna (1042) in the target receiving antenna module to receive the second optical wave beam through the receiving electronic switch (1044) in the target receiving antenna module, and the target receiving antenna module is a receiving antenna module (104) adjacent to the transmitting antenna module (102).

5. A real-time imaging system, characterized in that: The invention comprises the local multiple-transmit and multiple-receive antenna array according to any one of claims 1 to 4.

6. The system according to claim 5, characterized in that The system further comprises: a scanning device (402) and a data acquisition and processing system (404); The data acquisition and processing system (404) is used to output a light wave control signal to the local multiple-transmit multiple-receive antenna array, and the local multiple-transmit multiple-receive antenna array is used to transmit the first light wave beam in response to the light wave control signal; The data acquisition and processing system (404) is further used to output a scanning control signal to the scanning device (402), and the scanning device (402) is used to periodically swing in response to the scanning control signal to control the first light beam to irradiate various parts of the target to be measured; The local multi-transmit and multi-receive antenna array is further used to perform signal processing on a second optical beam to obtain echo data, where the second optical beam is an optical beam obtained by reflection after the first optical beam irradiates the target to be measured; The data acquisition and processing system (404) is also used to receive echo data corresponding to any part of the target to be measured output by the local multi-transmit multi-receive antenna array, obtain an image of any part of the target to be measured based on the echo data, and reconstruct the image of the target to be measured based on the images of each part of the target to be measured.

7. The system according to claim 6, characterized in that The system further comprises a focusing component (406), wherein the focusing component (406) is used to converge the first light beam, and the converged first light beam is controlled by the scanning device (402) to irradiate the target to be measured; The focusing component (406) is also used to converge the second optical beam, and the converged second optical beam is received by the local multi-transmit and multi-receive antenna array.

8. The system according to claim 6, characterized in that The scanning device (402) comprises: a control unit (502), a motor (504) and a reflective optical device (506); The control unit (502) is connected to the motor (504), the reflective optical device (506) and the data acquisition and processing system (108) respectively, and is used to control the swing of the reflective optical device (506) according to the scanning control signal, so that the first light beam irradiates various parts of the target to be measured; The motor (504) is used to power the reflective optical device (506); The reflective optical device (506) is used to reflect the first light beam so that the first light beam illuminates the target to be measured.

9. A real-time security inspection device, comprising the real-time imaging system according to any one of claims 5 to 8.

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