A multi-angle terahertz imaging system and imaging method thereof

Abstract

The present application discloses a multi-angle terahertz imaging system and an imaging method thereof, wherein the multi-angle terahertz imaging system comprises: a conveyor belt for transmitting an object to be tested; at least one terahertz source, arranged above the conveyor belt, for emitting terahertz signals of multiple angles to the object to be tested on the conveyor belt; and a terahertz camera, arranged below the conveyor belt, for receiving the terahertz signal passing through the object to be tested on the conveyor belt. Through the above method, the present application can achieve the effect of multi-angle imaging of the object to be tested at a relatively low cost, and improve the accuracy of terahertz imaging.

Description

Technical Field

[0001] The present application relates to the field of terahertz detection, and in particular to a multi-angle terahertz imaging system and an imaging method thereof. Background Art

[0002] Terahertz (THz) waves refer to electromagnetic waves with a frequency range of 0.1 to 10 THz (wavelength of 3000 to 30 μm). They overlap with millimeter waves in the long-wave band and with infrared light in the short-wave band. They are the transition zone from macroscopic classical theory to microscopic quantum theory, and also the transition zone from electronics to photonics, which is called the "THz gap" of the electromagnetic spectrum. At the same time, because the energy of terahertz is very small and will not cause damage to matter, it has more advantages than X-rays in the field of detection.

[0003] The current imaging systems are composed of a fixed terahertz source and a terahertz camera, so there is only single-angle imaging. Due to the single imaging angle, it is easy to cause imaging errors, unclear identification, and low detection accuracy. Summary of the invention

[0004] The present application provides a multi-angle terahertz imaging system and an imaging method thereof, so as to solve the problem that the imaging system in the prior art has a single imaging angle, which easily causes imaging errors and unclear recognition.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is to provide a multi-angle terahertz imaging system, the multi-angle terahertz imaging system comprising:

[0006] Conveyor belt, used to transport the object to be tested;

[0007] At least one terahertz source is disposed above the conveyor belt and is used to emit terahertz signals at multiple angles to the object to be measured on the conveyor belt;

[0008] The terahertz camera is arranged below the conveyor belt and is used to receive the terahertz signal of the object to be measured passing through the conveyor belt.

[0009] Wherein, the multi-angle terahertz imaging system comprises at least three terahertz sources;

[0010] The at least three terahertz sources are equidistantly arranged above the conveyor belt, and emit terahertz signals of different angles to the object to be measured in sequence based on the moving speed of the conveyor belt.

[0011] The multi-angle terahertz imaging system includes an arc track and a movable terahertz source arranged on the arc track. The movable terahertz source moves back and forth on the arc track based on the movement speed of the conveyor belt to emit terahertz signals of different angles to the object to be measured.

[0012] Wherein, the multi-angle terahertz imaging system further comprises a plurality of sensors, and the plurality of sensors are arranged inside the conveyor belt;

[0013] When the sensor detects the object to be detected, the sensor sends a detection signal to the terahertz source, so that the terahertz source emits the terahertz signal based on the detection signal.

[0014] Wherein, the sensor is a photoelectric sensor.

[0015] Wherein, the terahertz camera is any one of a terahertz line array camera and a terahertz area array camera.

[0016] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a multi-angle terahertz imaging method, which is applied to a multi-angle terahertz imaging system, which comprises: a conveyor belt, which is used to transmit the object to be measured; at least one terahertz source, which is arranged above the conveyor belt, and is used to emit terahertz signals of multiple angles to the object to be measured on the conveyor belt; a terahertz camera, which is arranged below the conveyor belt, and is used to receive the terahertz signal passing through the object to be measured on the conveyor belt;

[0017] The multi-angle terahertz imaging method comprises:

[0018] When the object to be measured moves on the conveyor belt, the at least one terahertz source emits a terahertz signal to the object to be measured;

[0019] The terahertz camera receives terahertz signals passing through the object to be measured from multiple angles and generates a terahertz imaging image based on the terahertz signals.

[0020] Wherein, the multi-angle terahertz imaging system further comprises a sensor disposed in the conveyor belt;

[0021] The step of transmitting a terahertz signal from the at least one terahertz source to the object under test when the object under test moves on the conveyor belt comprises:

[0022] When the sensor detects the object to be measured, the sensor transmits a detection signal to the at least one terahertz source, so that the at least one terahertz source transmits the terahertz signal to the object to be measured based on the detection signal.

[0023] Wherein, the multi-angle terahertz imaging system comprises at least three terahertz sources, and the at least three terahertz sources are equidistantly arranged above the conveyor belt;

[0024] The step of transmitting a terahertz signal from the at least one terahertz source to the object under test when the object under test moves on the conveyor belt comprises:

[0025] When the sensor detects the object to be detected, the sensor transmits a detection signal to the at least three terahertz sources, so that the at least three terahertz sources sequentially emit the terahertz signal to the object to be detected based on the detection signal.

[0026] Wherein, the multi-angle terahertz imaging system comprises an arc track and a movable terahertz source arranged on the arc track, and the movable terahertz source can move back and forth on the arc track based on the movement speed of the conveyor belt;

[0027] The step of transmitting a terahertz signal from the at least one terahertz source to the object under test when the object under test moves on the conveyor belt comprises:

[0028] When the sensor detects the object to be measured, the sensor transmits a detection signal to the movable terahertz source, so that the movable terahertz source moves on the arc track based on the detection signal and emits the terahertz signal to the object to be measured.

[0029] Different from the prior art, the beneficial effect of the present application is that: the multi-angle terahertz imaging system includes: a conveyor belt for transmitting the object to be tested; at least one terahertz source, arranged above the conveyor belt, for emitting terahertz signals of multiple angles to the object to be tested on the conveyor belt; a terahertz camera, arranged below the conveyor belt, for receiving the terahertz signal passing through the object to be tested on the conveyor belt. Through the above method, the present application can achieve the effect of multi-angle imaging of the object to be tested at a relatively low cost, and improve the accuracy of terahertz imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 is a structural schematic diagram of an embodiment of a terahertz imaging system in the prior art;

[0032] Figure 2is a structural schematic diagram of an embodiment of a multi-angle terahertz imaging system provided by the present application;

[0033] Figure 3 is a structural schematic diagram of another embodiment of the multi-angle terahertz imaging system provided by the present application;

[0034] Figure 4 It is a flow chart of an embodiment of a multi-angle terahertz imaging method provided by the present application;

[0035] Figure 5 is a flow chart of another embodiment of the multi-angle terahertz imaging method provided by the present application;

[0036] Figure 6 It is a flow chart of another embodiment of the multi-angle terahertz imaging method provided by the present application;

[0037] Figure 7 It is a schematic diagram of a framework of an embodiment of an electronic device provided by the present application;

[0038] Figure 8 A schematic diagram of a framework of an embodiment of a computer-readable storage medium provided in the present application. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] like Figure 1 As shown, Figure 1 1 is a schematic diagram of a structure of an embodiment of a terahertz imaging system in the prior art. The terahertz imaging system 100 in the prior art specifically includes a conveyor belt 11, a terahertz source 12 and a terahertz camera 13. The center line connecting the terahertz source 12 and the terahertz camera 13 is perpendicular to the moving direction of the conveyor belt 11.

[0041] Specifically, the terahertz source 12 is used to generate a terahertz signal, and the terahertz camera 13 is used to receive the terahertz signal transmitted through the object to be tested on the conveyor belt 11, and generate terahertz imaging based on the received terahertz signal to realize terahertz security inspection.

[0042] Since the terahertz imaging system 100 in the prior art is composed of a fixed terahertz source 12 and a terahertz camera 13, there is only single-angle imaging. Due to the single imaging angle, imaging errors are easily caused, unclear recognition, and low detection accuracy.

[0043] In order to solve the problem that most current terahertz imaging systems only have a single imaging angle, this application provides a multi-angle terahertz imaging system. Figure 2 , Figure 2 It is a structural schematic diagram of an embodiment of a multi-angle terahertz imaging system provided in the present application.

[0044] The terahertz imaging system 200 of this embodiment specifically includes a conveyor belt 21 for transmitting the object to be tested; at least one terahertz source 22, arranged above the conveyor belt 21, for emitting terahertz signals of multiple angles to the object to be tested on the conveyor belt 21; and a terahertz camera 23, arranged below the conveyor belt 21, for receiving multi-angle terahertz signals passing through the object to be tested on the conveyor belt 21.

[0045] like Figure 2 As shown, the terahertz imaging system 200 of this embodiment includes at least three terahertz sources 22. The three terahertz sources 22 are equidistantly arranged above the conveyor belt 21, and transmit terahertz signals of different angles to the object to be measured in sequence based on the moving speed of the conveyor belt 21. The three terahertz sources 22 can be arranged above the conveyor belt 21 according to an arc shape, and the center of the arc is located below the conveyor belt 21, specifically, it can be located at the center of the terahertz camera 23, so that the terahertz camera 23 can well receive the terahertz signals of different angles emitted by the three terahertz sources 22.

[0046] Furthermore, the terahertz imaging system 200 of this embodiment further includes a plurality of sensors 24 . The plurality of sensors 24 are disposed inside the conveyor belt 21 and close to a side of the conveyor belt 21 close to the terahertz source 22 .

[0047] During the detection process, the object to be tested moves on the conveyor belt 21. When the object to be tested passes through the signal coverage area of ​​the sensor 24, the sensor 24 generates a current signal and sends it to the control system of the terahertz source 22 (not shown in the figure), so that the control system controls the working state of the terahertz source 22 based on the current signal.

[0048] The sensor 24 provided in this embodiment may be a photoelectric sensor or other types of sensors, which will not be described in detail here.

[0049] Furthermore, the terahertz camera 23 provided in the present application is specifically any one of a terahertz line array camera and a terahertz area array camera.

[0050] When the terahertz camera 23 is a terahertz line array camera, the initial state of the terahertz source 22 is the off state, each terahertz source 22 corresponds to each sensor 24 one by one, the sensor 24 controls the switch of the corresponding terahertz source 22, and the position of the sensor 24 is set on the optical path from the terahertz source 22 controlled by it to the terahertz camera 23. Whenever the object to be measured passes through the sensor 24, the sensor 24 detects a signal and gives a control signal to the timing circuit, and the timing signal turns on the controlled terahertz source, and imaging of an angle can be performed at this time. After collecting an image, the terahertz source 22 is immediately turned off. When passing the next sensor 24, the above steps are repeated to complete multi-angle collection.

[0051] When the terahertz camera 23 is a terahertz array camera, the terahertz source 22 also corresponds to the sensor 24. When the object to be measured reaches the sensor 24, the timing circuit turns on the terahertz source 22 it controls, and the array camera immediately turns off the terahertz source 22 after collecting a frame of image, which can also achieve multi-angle collection.

[0052] In order to solve the problem that most current terahertz imaging systems only have a single imaging angle, this application provides another multi-angle terahertz imaging system. Figure 3 , Figure 3 It is a structural schematic diagram of another embodiment of the multi-angle terahertz imaging system provided in the present application.

[0053] The terahertz imaging system 300 of this embodiment specifically includes a conveyor belt 31 for transmitting the object to be tested; at least one terahertz source 32, arranged above the conveyor belt 31, for emitting terahertz signals of multiple angles to the object to be tested on the conveyor belt 31; and a terahertz camera 33, arranged below the conveyor belt 31, for receiving multi-angle terahertz signals passing through the object to be tested on the conveyor belt 31.

[0054] like Figure 3 As shown, the terahertz imaging system 300 of this embodiment further includes an arc track 35, and the terahertz source 32 is specifically a movable terahertz source 32. The movable terahertz source 32 of this embodiment is arranged on the arc track 35, and moves back and forth on the arc track 35 based on the movement speed of the conveyor belt 31 to emit terahertz signals of different angles to the object to be measured.

[0055] The center of the arc track 35 is located below the conveyor belt 31 , and specifically can be located at the center of the terahertz camera 33 , so that the terahertz camera 33 can well receive the terahertz signals of different angles emitted by the movable terahertz source 32 .

[0056] Furthermore, the terahertz imaging system 300 of this embodiment also includes a plurality of sensors 34, specifically Figure 2The sensors 24 in the embodiments are the same and will not be described again.

[0057] In order to solve the problem that most current terahertz imaging systems only have a single imaging angle, this application provides a multi-angle terahertz imaging method. Figure 4 , Figure 4 It is a flow chart of an embodiment of a multi-angle terahertz imaging method provided in the present application.

[0058] The multi-angle terahertz imaging method of this embodiment is applied to Figure 2 and Figure 3 The multi-angle terahertz imaging system is provided. The specific structure of the imaging system will not be described in detail here.

[0059] like Figure 4 As shown, the multi-angle terahertz imaging method of this embodiment specifically includes the following steps:

[0060] S401: When the object to be tested moves on the conveyor belt, at least one terahertz source transmits a terahertz signal to the object to be tested.

[0061] S402: The terahertz camera receives terahertz signals passing through the object to be measured from multiple angles and directions, and generates a terahertz imaging image based on the terahertz signals.

[0062] In order to solve the problem that most current terahertz imaging systems only have a single imaging angle, this application provides another multi-angle terahertz imaging method. Figure 5 , Figure 5 It is a flow chart of another embodiment of the multi-angle terahertz imaging method provided in the present application.

[0063] The multi-angle terahertz imaging method of this embodiment is applied to Figure 2 and Figure 3 The multi-angle terahertz imaging system is provided. The specific structure of the imaging system will not be described in detail here.

[0064] like Figure 5 As shown, the multi-angle terahertz imaging method of this embodiment specifically includes the following steps:

[0065] S501: When the sensor detects the object to be measured, the sensor transmits a detection signal to at least three terahertz sources, so that the at least three terahertz sources sequentially emit terahertz signals to the object to be measured based on the detection signal.

[0066] S502: The terahertz camera receives terahertz signals passing through the object to be measured from multiple angles and directions, and generates a terahertz imaging image based on the terahertz signals.

[0067] In order to solve the problem that most current terahertz imaging systems only have a single imaging angle, this application provides another multi-angle terahertz imaging method. Figure 6 , Figure 6 It is a flow chart of another embodiment of the multi-angle terahertz imaging method provided in the present application.

[0068] The multi-angle terahertz imaging method of this embodiment is applied to Figure 2 and Figure 3 The multi-angle terahertz imaging system is provided. The specific structure of the imaging system will not be described in detail here.

[0069] like Figure 6 As shown, the multi-angle terahertz imaging method of this embodiment specifically includes the following steps:

[0070] S601: When the sensor detects the object to be measured, the sensor transmits a detection signal to the movable terahertz source, so that the movable terahertz source moves in an arc track based on the detection signal and emits a terahertz signal to the object to be measured.

[0071] S602: The terahertz camera receives terahertz signals passing through the object to be measured from multiple angles and directions, and generates a terahertz imaging image based on the terahertz signals.

[0072] See also Figure 7 , Figure 7 : is a schematic diagram of a framework of an embodiment of an electronic device provided by the present application. The electronic device 70 includes a memory 71 and a processor 72 coupled to each other, and the processor 72 is used to execute program instructions stored in the memory 71 to implement the steps of any of the above-mentioned multi-angle terahertz imaging method embodiments. In a specific implementation scenario, the electronic device 70 may include but is not limited to: a microcomputer, a server, and in addition, the electronic device 70 may also include a mobile device such as a laptop computer and a tablet computer, which is not limited here.

[0073] Specifically, the processor 72 is used to control itself and the memory 71 to implement the steps of any of the above-mentioned multi-angle terahertz imaging method embodiments. The processor 72 can also be called a CPU (Central Processing Unit). The processor 72 may be an integrated circuit chip with signal processing capabilities. The processor 72 can also be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field-programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. In addition, the processor 72 can be implemented by an integrated circuit chip.

[0074] See also Figure 8 , Figure 8 The computer-readable storage medium 80 stores program instructions 801 that can be executed by a processor, and the program instructions 801 are used to implement the steps of any of the above multi-angle terahertz imaging method embodiments.

[0075] In some embodiments, the functions or modules included in the device provided by the embodiments of the present disclosure can be used to execute the method described in the above method embodiments. The specific implementation can refer to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0076] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0077] In the several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation described above is only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation, such as units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0078] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0079] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of each implementation method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program code.

[0080] The above description is only an implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A multi-angle terahertz imaging system, characterized in that: The multi-angle terahertz imaging system comprises: Conveyor belt, used to transport the object to be tested; A terahertz camera is disposed below the conveyor belt and is used to receive a terahertz signal of the object to be measured passing through the conveyor belt; The multi-angle terahertz imaging system includes at least three terahertz sources; The at least three terahertz sources are equidistantly arranged above the conveyor belt, and emit terahertz signals of different angles to the object to be measured in sequence based on the moving speed of the conveyor belt; The at least three terahertz sources are arranged above the conveyor belt according to an arc shape, and the center of the arc is located below the conveyor belt and at the center of the terahertz camera; or, The multi-angle terahertz imaging system includes an arc track and a movable terahertz source arranged on the arc track, and the movable terahertz source moves back and forth on the arc track based on the movement speed of the conveyor belt to emit terahertz signals of different angles to the object to be measured; The arc track is located at the center of the terahertz camera, so that the terahertz camera can receive terahertz signals at different angles emitted by a terahertz source.

2. The multi-angle terahertz imaging system according to claim 1, characterized in that: The multi-angle terahertz imaging system further includes a plurality of sensors, and the plurality of sensors are arranged inside the conveyor belt; When the sensor detects the object to be detected, the sensor sends a detection signal to the terahertz source, so that the terahertz source emits the terahertz signal based on the detection signal.

3. The multi-angle terahertz imaging system according to claim 2, characterized in that: The sensor is a photoelectric sensor.

4. The multi-angle terahertz imaging system according to claim 1, characterized in that: The terahertz camera is any one of a terahertz line array camera and a terahertz area array camera.

5. A multi-angle terahertz imaging method, characterized in that: The multi-angle terahertz imaging method is applied to a multi-angle terahertz imaging system, which comprises: a conveyor belt for transmitting an object to be tested; a terahertz camera arranged below the conveyor belt for receiving a terahertz signal passing through the object to be tested on the conveyor belt; the multi-angle terahertz imaging system comprises at least three terahertz sources; The at least three terahertz sources are equidistantly arranged above the conveyor belt, and emit terahertz signals of different angles to the object to be measured in sequence based on the moving speed of the conveyor belt; The multi-angle terahertz imaging method comprises: When the object to be measured moves on the conveyor belt, the at least one terahertz source emits a terahertz signal to the object to be measured; The terahertz camera receives terahertz signals passing through the object to be measured from multiple angles and generates a terahertz imaging image based on the terahertz signals; The at least three terahertz sources are arranged above the conveyor belt according to an arc shape, and the center of the arc is located below the conveyor belt and at the center of the terahertz camera; or, The multi-angle terahertz imaging system includes an arc track and a movable terahertz source arranged on the arc track, and the movable terahertz source moves back and forth on the arc track based on the movement speed of the conveyor belt to emit terahertz signals of different angles to the object to be measured; The arc track is located at the center of the terahertz camera, so that the terahertz camera can receive terahertz signals at different angles emitted by a terahertz source.

6. The multi-angle terahertz imaging method according to claim 5, characterized in that: The multi-angle terahertz imaging system further includes a sensor disposed in the conveyor belt; The step of transmitting a terahertz signal from the at least one terahertz source to the object under test when the object under test moves on the conveyor belt comprises: When the sensor detects the object to be measured, the sensor transmits a detection signal to the at least one terahertz source, so that the at least one terahertz source transmits the terahertz signal to the object to be measured based on the detection signal.

7. The multi-angle terahertz imaging method according to claim 6, characterized in that: The multi-angle terahertz imaging system comprises at least three terahertz sources, and the at least three terahertz sources are equidistantly arranged above the conveyor belt; The step of transmitting a terahertz signal from the at least one terahertz source to the object under test when the object under test moves on the conveyor belt comprises: When the sensor detects the object to be detected, the sensor transmits a detection signal to the at least three terahertz sources, so that the at least three terahertz sources sequentially emit the terahertz signal to the object to be detected based on the detection signal.

8. The multi-angle terahertz imaging method according to claim 6, characterized in that: The step of transmitting a terahertz signal from the at least one terahertz source to the object under test when the object under test moves on the conveyor belt comprises: When the sensor detects the object to be measured, the sensor transmits a detection signal to the movable terahertz source, so that the movable terahertz source moves on the arc track based on the detection signal and emits the terahertz signal to the object to be measured.

Images