CN112051235A - Multi-angle terahertz imaging system and imaging method thereof - Google Patents
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Abstract
The application discloses multi-angle terahertz imaging system and imaging method thereof, the multi-angle terahertz imaging system comprises: the conveying belt is used for conveying the object to be detected; the terahertz source is arranged above the conveyor belt and used for transmitting terahertz signals of a plurality of angles to an object to be detected on the conveyor belt; the terahertz camera is arranged below the conveying belt and used for receiving terahertz signals of the object to be detected which penetrates through the conveying belt. By the method, the effect of multi-angle imaging of the object to be detected can be achieved at low cost, and the accuracy of terahertz imaging is improved.
Description
Technical Field
The application relates to the field of terahertz detection, in particular to a multi-angle terahertz imaging system and an imaging method thereof.
Background
Terahertz (THz) waves refer to electromagnetic waves with the frequency within the range of 0.1-10 THz (the wavelength is 3000-30 mu m), coincide with millimeter waves in a long wave band, coincide with infrared light in a short wave band, are transition regions from a macroscopic classical theory to a microscopic quantum theory, are transition regions from electronics to photonics, and are called terahertz gaps (THz gaps) of electromagnetic spectrum. Meanwhile, the terahertz energy is very small, and the material cannot be damaged, so that the terahertz wave detector has more advantages in the detection field compared with the X-ray.
The existing imaging system is composed of a fixed terahertz source and a terahertz camera, so that only imaging at a single angle exists, imaging errors are easily caused due to the single imaging angle, the situation of unclear recognition is easily caused, and the detection accuracy is low.
Disclosure of Invention
The application provides a multi-angle terahertz imaging system and an imaging method thereof, which aim to solve the problems that in the prior art, the imaging angle of the imaging system is single, imaging errors are easily caused, and the identification is unclear.
In order to solve the technical problem, the application adopts a technical scheme that: provided is a multi-angle terahertz imaging system, including:
the conveying belt is used for conveying the object to be detected;
the terahertz source is arranged above the conveyor belt and used for transmitting terahertz signals of a plurality of angles to an object to be detected on the conveyor belt;
the terahertz camera is arranged below the conveying belt and used for receiving terahertz signals of the object to be detected which penetrates through the conveying belt.
Wherein the multi-angle terahertz imaging system comprises at least three terahertz sources;
the three terahertz sources are arranged above the conveyor belt at equal intervals, and terahertz signals at different angles are transmitted to the object to be detected in sequence based on the movement speed of the conveyor belt.
The multi-angle terahertz imaging system comprises an arc-shaped track and a movable terahertz source arranged on the arc-shaped track, wherein the movable terahertz source moves back and forth on the basis of the movement speed of the conveyor belt, so that terahertz signals at different angles are emitted to the object to be detected.
The multi-angle terahertz imaging system further comprises a plurality of sensors, and the 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.
Wherein the sensor is a photoelectric sensor.
The terahertz camera is any one of a terahertz linear array camera and a terahertz area-array camera.
In order to solve the technical problem, the application adopts a technical scheme that: the multi-angle terahertz imaging method is applied to a multi-angle terahertz imaging system, and the multi-angle terahertz imaging system comprises the following steps: the conveying belt is used for conveying the object to be detected; the terahertz source is arranged above the conveyor belt and used for transmitting terahertz signals of a plurality of angles to an object to be detected on the conveyor belt; the terahertz camera is arranged below the conveyor belt and used for receiving terahertz signals passing through the object to be detected on the conveyor belt;
the multi-angle terahertz imaging method comprises the following steps:
when the object to be detected moves on the conveyor belt, the at least one terahertz source transmits a terahertz signal to the object to be detected;
the terahertz camera receives terahertz signals from a plurality of angle directions and penetrating through the object to be detected, and generates terahertz imaging images based on the terahertz signals.
The multi-angle terahertz imaging system further comprises a sensor arranged in the conveying belt;
when the object to be measured moves on the conveyor belt, the step that the at least one terahertz source transmits a terahertz signal to the object to be measured comprises the following steps:
when the sensor detects the object to be detected, the sensor transmits a detection signal to the at least one terahertz source, so that the at least one terahertz source emits the terahertz signal to the object to be detected based on the detection signal.
The multi-angle terahertz imaging system comprises at least three terahertz sources, wherein the at least three terahertz sources are arranged above the conveyor belt at equal intervals;
when the object to be measured moves on the conveyor belt, the step that the at least one terahertz source transmits a terahertz signal to the object to be measured comprises the following steps:
when the sensor detects the object to be detected, the sensor transmits detection signals to the at least three terahertz sources, so that the at least three terahertz sources sequentially emit the terahertz signals to the object to be detected based on the detection signals.
The multi-angle terahertz imaging system comprises an arc-shaped track and a movable terahertz source arranged on the arc-shaped track, wherein the movable terahertz source moves back and forth on the arc-shaped track based on the movement speed of the conveyor belt;
when the object to be measured moves on the conveyor belt, the step that the at least one terahertz source transmits a terahertz signal to the object to be measured comprises the following steps:
when the sensor detects the object to be detected, the sensor transmits a detection signal to the movable terahertz source, so that the movable terahertz source moves on the arc-shaped track based on the detection signal and transmits the terahertz signal to the object to be detected.
Different from the prior art, the beneficial effects of this application lie in: the multi-angle terahertz imaging system includes: the conveying belt is used for conveying the object to be detected; the terahertz source is arranged above the conveyor belt and used for transmitting terahertz signals of a plurality of angles to an object to be detected on the conveyor belt; the terahertz camera is arranged below the conveying belt and used for receiving terahertz signals of the object to be detected which penetrates through the conveying belt. By the method, the effect of multi-angle imaging of the object to be detected can be achieved at low cost, and the accuracy of terahertz imaging is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a structure of an embodiment of a terahertz imaging system in the prior art;
FIG. 2 is a schematic structural diagram of an embodiment of a multi-angle terahertz imaging system provided by the present application;
FIG. 3 is a schematic structural diagram of another embodiment of a multi-angle terahertz imaging system provided by the present application;
FIG. 4 is a schematic flow chart diagram of an embodiment of a multi-angle terahertz imaging method provided by the present application;
FIG. 5 is a schematic flow chart diagram of another embodiment of a multi-angle terahertz imaging method provided by the present application;
FIG. 6 is a schematic flow chart diagram of a further embodiment of a multi-angle terahertz imaging method provided by the present application;
FIG. 7 is a block diagram of an embodiment of an electronic device provided herein;
FIG. 8 is a block diagram of an embodiment of a computer-readable storage medium provided herein.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram 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. Wherein, the central connecting line of the terahertz source 12 and the terahertz camera 13 is perpendicular to the moving direction of the conveyor belt 11.
Specifically, the terahertz source 12 is used for generating a terahertz signal, and the terahertz camera 13 is used for receiving the terahertz signal transmitted through the object to be measured on the conveyor belt 11, generating terahertz imaging based on the received terahertz signal, and realizing terahertz security inspection.
Because the terahertz imaging system 100 in the prior art is composed of a fixed terahertz source 12 and a terahertz camera 13, only imaging at a single angle exists, and because the imaging angle is single, imaging errors and unclear recognition are easily caused, and the detection accuracy is low.
In order to solve the problem that most terahertz imaging systems only have a single imaging angle at present, the application provides a multi-angle terahertz imaging system, and please refer to fig. 2 specifically, fig. 2 is a schematic structural diagram of an embodiment of the multi-angle terahertz imaging system provided by the application.
The terahertz imaging system 200 of the present embodiment specifically includes a conveyor belt 21 for conveying an object to be measured; at least one terahertz source 22 arranged above the conveyor belt 21 and used for emitting terahertz signals of multiple angles to the object to be measured on the conveyor belt 21; the terahertz camera 23 is arranged below the conveyor belt 21 and is used for receiving the multi-angle terahertz signal passing through the object to be detected on the conveyor belt 21.
As shown in fig. 2, the terahertz imaging system 200 of the present embodiment includes at least three terahertz sources 22. The three terahertz sources 22 are equidistantly arranged above the conveyor belt 21, and sequentially emit terahertz signals at different angles to the object to be detected based on the movement speed of the conveyor belt 21. The three terahertz sources 22 can be arranged above the conveyor belt 21 according to an arc shape, the center of the arc is located below the conveyor belt 21, and specifically, the center of the terahertz camera 23 can be located, so that the terahertz camera 23 can well receive terahertz signals emitted by the three terahertz sources 22 at different angles.
Further, the terahertz imaging system 200 of the present embodiment further includes a plurality of sensors 24, and the plurality of sensors 24 are disposed inside the conveyor belt 21 and proximate to a side of the conveyor belt 21 close to the terahertz source 22.
During the detection process, the object to be detected moves on the conveyor belt 21, when the object to be detected passes through the signal coverage area of the sensor 24, the sensor 24 generates a current signal and sends the current signal to a control system (not shown in the figure) of the terahertz source 22, so that the control system controls the working state of the terahertz source 22 based on the current signal.
The sensor 24 provided in this embodiment may be a photoelectric sensor, or may be another type of sensor, which is not described herein again.
Further, the terahertz camera 23 provided by the present application is specifically any one of a terahertz line-array camera and a terahertz area-array camera.
When the terahertz camera 23 is a terahertz line-scan terahertz camera, the initial state of the terahertz source 22 is an 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 arranged on the light path from the terahertz source 22 to the terahertz camera 23 controlled by the sensor 24. When an object to be measured passes through the sensor 24, the sensor 24 detects a signal and gives a control signal to the time sequence circuit, the time sequence signal turns on the controlled terahertz source, at the moment, imaging at an angle can be carried out, and after an image is acquired, the terahertz source 22 is immediately turned off. When the next sensor 24 is passed, the above steps are repeated, and multi-angle collection can be completed.
When the terahertz camera 23 is a terahertz area-array camera, the terahertz sources 22 and the sensors 24 are also in one-to-one correspondence. When the object to be detected reaches the sensor 24, the terahertz source 22 controlled by the sequential circuit is turned on by the sequential circuit, and the terahertz source 22 is turned off immediately after the area-array camera collects a frame of image, so that multi-angle collection can be realized.
In order to solve the problem that most terahertz imaging systems only have a single imaging angle, the present application provides another multi-angle terahertz imaging system, and please refer to fig. 3 specifically, where fig. 3 is a schematic structural diagram of another embodiment of the multi-angle terahertz imaging system provided by the present application.
The terahertz imaging system 300 of the present embodiment specifically includes a conveyor belt 31 for conveying an object to be measured; at least one terahertz source 32 arranged above the conveyor belt 31 and used for emitting terahertz signals of a plurality of angles to the object to be measured on the conveyor belt 31; the terahertz camera 33 is arranged below the conveyor belt 31 and used for receiving the multi-angle terahertz signal passing through the object to be measured on the conveyor belt 31.
As shown in fig. 3, the terahertz imaging system 300 of the present embodiment further includes an arc-shaped track 35, and the terahertz source 32 is specifically a movable terahertz source 32. The movable terahertz source 32 of the present embodiment is disposed on the arc-shaped track 35, and moves back and forth on the arc-shaped track 35 based on the movement speed of the conveyor belt 31, so as to emit terahertz signals at different angles to the object to be measured.
The center of the arc-shaped track 35 is located below the conveyor belt 31, and particularly can be located at the center of the terahertz camera 33, so that the terahertz camera 33 can well receive terahertz signals emitted by the movable terahertz source 32 at different angles.
Further, the terahertz imaging system 300 of the present embodiment also includes a plurality of sensors 34, which are specifically the same as the sensors 24 in the embodiment of fig. 2, and are not described herein again.
In order to solve the problem that most terahertz imaging systems only have a single imaging angle, the present application provides a multi-angle terahertz imaging method, and please refer to fig. 4 specifically, where fig. 4 is a schematic flow diagram of an embodiment of the multi-angle terahertz imaging method provided by the present application.
The multi-angle terahertz imaging method of the embodiment is applied to the multi-angle terahertz imaging systems shown in fig. 2 and 3, and the specific structure of the imaging system is not described herein again.
As shown in fig. 4, the multi-angle terahertz imaging method of the present embodiment specifically includes the following steps:
s401: when the object to be measured moves on the conveyor belt, the terahertz source transmits a terahertz signal to the object to be measured.
S402: the terahertz camera receives terahertz signals from a plurality of angle directions and penetrates through an object to be detected, and generates a terahertz imaging image based on the terahertz signals.
In order to solve the problem that most terahertz imaging systems only have a single imaging angle, the present application provides another multi-angle terahertz imaging method, and please refer to fig. 5 specifically, where fig. 5 is a schematic flow diagram of another embodiment of the multi-angle terahertz imaging method provided by the present application.
The multi-angle terahertz imaging method of the embodiment is applied to the multi-angle terahertz imaging systems shown in fig. 2 and 3, and the specific structure of the imaging system is not described herein again.
As shown in fig. 5, the multi-angle terahertz imaging method of the embodiment specifically includes the following steps:
s501: when the sensor detects the object to be detected, the sensor transmits detection signals to the at least three terahertz sources, so that the at least three terahertz sources sequentially emit terahertz signals to the object to be detected based on the detection signals.
S502: the terahertz camera receives terahertz signals from a plurality of angle directions and penetrates through an object to be detected, and generates a terahertz imaging image based on the terahertz signals.
In order to solve the problem that most terahertz imaging systems only have a single imaging angle, the present application provides another multi-angle terahertz imaging method, and please refer to fig. 6 specifically, where fig. 6 is a schematic flow diagram of another embodiment of the multi-angle terahertz imaging method provided by the present application.
The multi-angle terahertz imaging method of the embodiment is applied to the multi-angle terahertz imaging systems shown in fig. 2 and 3, and the specific structure of the imaging system is not described herein again.
As shown in fig. 6, the multi-angle terahertz imaging method of the present embodiment specifically includes the following steps:
s601: when the sensor detects an object to be detected, the sensor transmits a detection signal to the movable terahertz source, so that the movable terahertz source moves on the arc-shaped track based on the detection signal and transmits the terahertz signal to the object to be detected.
S602: the terahertz camera receives terahertz signals from a plurality of angle directions and penetrates through an object to be detected, and generates a terahertz imaging image based on the terahertz signals.
Referring to fig. 7, fig. 7 is a schematic diagram of a frame of an embodiment of an electronic device provided in the present application. The electronic device 70 comprises a memory 71 and a processor 72 coupled to each other, and the processor 72 is configured to execute program instructions stored in the memory 71 to implement the steps of any of the above-described embodiments of the multi-angle terahertz imaging method. In one particular implementation scenario, the electronic device 70 may include, but is not limited to: a microcomputer, a server, and the electronic device 70 may also include a mobile device such as a notebook computer, a tablet computer, and the like, which is not limited herein.
Specifically, the processor 72 is configured to control itself and the memory 71 to implement the steps of any of the above-described multi-angle terahertz imaging method embodiments. The processor 72 may also be referred to as a CPU (Central Processing Unit). The processor 72 may be an integrated circuit chip having signal processing capabilities. The Processor 72 may also be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. Additionally, the processor 72 may be collectively implemented by an integrated circuit chip.
Referring to fig. 8, fig. 8 is a block diagram illustrating an embodiment of a computer-readable storage medium according to the present application. The computer readable storage medium 80 stores program instructions 801 executable by the processor, the program instructions 801 for implementing the steps of any of the above-described multi-angle terahertz imaging method embodiments.
In some embodiments, functions of or modules included in the apparatus provided in the embodiments of the present disclosure may be used to execute the method described in the above method embodiments, and specific implementation thereof may refer to the description of the above method embodiments, and for brevity, will not be described again here.
The foregoing description of the various embodiments is intended to highlight various differences between the embodiments, and the same or similar parts may be referred to each other, and for brevity, will not be described again herein.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a module or a unit is merely one type of logical division, and an actual implementation may have another division, for example, a unit or a component may be combined or integrated with another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some interfaces, and may be in an electrical, mechanical or other form.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A multi-angle terahertz imaging system, characterized in that, the multi-angle terahertz imaging system includes:
the conveying belt is used for conveying the object to be detected;
the terahertz source is arranged above the conveyor belt and used for transmitting terahertz signals of a plurality of angles to an object to be detected on the conveyor belt;
the terahertz camera is arranged below the conveying belt and used for receiving terahertz signals of the object to be detected which penetrates through the conveying belt.
2. The multi-angle terahertz imaging system of claim 1, comprising at least three terahertz sources;
the three terahertz sources are arranged above the conveyor belt at equal intervals, and terahertz signals at different angles are transmitted to the object to be detected in sequence based on the movement speed of the conveyor belt.
3. The multi-angle terahertz imaging system of claim 1, comprising an arc-shaped track and a movable terahertz source arranged on the arc-shaped track, wherein the movable terahertz source moves back and forth on the arc-shaped track based on the movement speed of the conveyor belt to emit terahertz signals at different angles to the object to be measured.
4. The multi-angle terahertz imaging system of claim 2 or 3, further comprising a plurality of sensors disposed 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.
5. The multi-angle terahertz imaging system of claim 4, wherein the sensor is a photosensor.
6. The multi-angle terahertz imaging system of claim 1, wherein the terahertz camera is any one of a terahertz line camera and a terahertz area-array camera.
7. The multi-angle terahertz imaging method is applied to a multi-angle terahertz imaging system, and the multi-angle terahertz imaging system comprises the following steps: the conveying belt is used for conveying the object to be detected; the terahertz source is arranged above the conveyor belt and used for transmitting terahertz signals of a plurality of angles to an object to be detected on the conveyor belt; the terahertz camera is arranged below the conveyor belt and used for receiving terahertz signals passing through the object to be detected on the conveyor belt;
the multi-angle terahertz imaging method comprises the following steps:
when the object to be detected moves on the conveyor belt, the at least one terahertz source transmits a terahertz signal to the object to be detected;
the terahertz camera receives terahertz signals from a plurality of angle directions and penetrating through the object to be detected, and generates terahertz imaging images based on the terahertz signals.
8. The multi-angle terahertz imaging method of claim 7, wherein the multi-angle terahertz imaging system further comprises a sensor disposed within the conveyor belt;
when the object to be measured moves on the conveyor belt, the step that the at least one terahertz source transmits a terahertz signal to the object to be measured comprises the following steps:
when the sensor detects the object to be detected, the sensor transmits a detection signal to the at least one terahertz source, so that the at least one terahertz source emits the terahertz signal to the object to be detected based on the detection signal.
9. The multi-angle terahertz imaging method of claim 8, wherein the multi-angle terahertz imaging system comprises at least three terahertz sources, the at least three terahertz sources being disposed equidistantly above the conveyor belt;
when the object to be measured moves on the conveyor belt, the step that the at least one terahertz source transmits a terahertz signal to the object to be measured comprises the following steps:
when the sensor detects the object to be detected, the sensor transmits detection signals to the at least three terahertz sources, so that the at least three terahertz sources sequentially emit the terahertz signals to the object to be detected based on the detection signals.
10. The multi-angle terahertz imaging method of claim 8, wherein the multi-angle terahertz imaging system comprises an arc-shaped track and a movable terahertz source arranged on the arc-shaped track, wherein the movable terahertz source moves back and forth on the arc-shaped track based on the movement speed of the conveyor belt;
when the object to be measured moves on the conveyor belt, the step that the at least one terahertz source transmits a terahertz signal to the object to be measured comprises the following steps:
when the sensor detects the object to be detected, the sensor transmits a detection signal to the movable terahertz source, so that the movable terahertz source moves on the arc-shaped track based on the detection signal and transmits the terahertz signal to the object to be detected.
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2020
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| US20190278000A1 (en) * | 2018-03-08 | 2019-09-12 | Deutsche Post Ag | Method and Apparatus for Examining Shipments |
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