Portable terahertz security inspection device with automatic detection function and working method

Abstract

The invention relates to a portable terahertz security inspection device capable of automatic detection and a working method, and the device is characterized in that a mechanical auxiliary unit is used for driving an object to be detected to move, so that a terahertz wave source emits terahertz radiation, and the radiation penetrates through a sample to be detected, is received by a terahertz linear detector, and is converted into image information; and the automatic detection platform is used for receiving image information, carrying out preliminary integration and enhancement on the input image through an image preprocessing module, judging possible dangerous goods types through a deep convolutional neural network, calibrating each target frame and sending out an early warning. And core technologies such as a terahertz imaging technology and a deep learning algorithm are fused. Compared with the prior art, the system has the advantages of convenient carrying, comprehensive functions, automatic detection and the like, and is convenient to carry, install and use. The system can efficiently adapt to temporary security check of public activities, greatly improve security check quality, effectively prevent security risks, and meet urgent needs in the field of public security and protection.

Description

Technical Field

[0001] The present invention relates to the technical field of security inspection equipment, and in particular to a portable terahertz security inspection device capable of automatic detection and a working method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0004] At present, the security inspection methods commonly used in various public places mainly include X-ray security scanners, manual inspections, handheld metal detectors, metal detection gates, explosive trace detection, liquid detectors, etc. Among them, X-ray security scanners and metal detection gates are bulky and inconvenient to carry. They are mainly fixed in stations, airports and other places, and cannot meet the needs of temporary public activities; handheld metal detectors, explosive trace detection and liquid detectors only have a single function, and the security inspection range and speed are limited, and they cannot cope with high-density crowds; manual inspections have high accuracy but low efficiency. At the same time, these devices require human participation and rely heavily on people's experience to identify dangerous substances in images, and cannot guarantee long-term accuracy. In summary, these detection devices have the disadvantages of slow inspection speed, bulky size, inconvenient to carry, single function, and reliance on experience, and it is difficult to meet the security inspection needs of high-density crowd environments under public activity conditions. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a portable terahertz security inspection device and working method capable of automatic detection, which integrates core technologies such as terahertz imaging technology and deep learning algorithm. Compared with the existing technology, the system has the advantages of convenient carrying, comprehensive functions, automatic detection, etc., and is easy to carry, install and use. It can efficiently adapt to temporary security inspections of public activities, greatly improve the quality of security inspections, effectively prevent safety risks, and meet the urgent needs in the field of public security.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] The first aspect of the present invention provides a portable terahertz security inspection device capable of automatic detection, comprising:

[0008] The mechanical auxiliary unit is used to drive the object to be tested to move, so that the terahertz wave source emits terahertz radiation, which penetrates the sample to be tested, is received by the terahertz linear detector and converted into image information;

[0009] The automatic detection platform is used to receive image information and perform preliminary integration and enhancement on the input images through the image preprocessing module. It uses a deep convolutional neural network to identify possible dangerous goods categories, calibrate each target box, and issue an early warning.

[0010] Furthermore, the mechanical auxiliary unit includes a conveying module for carrying the object or sample to be tested, the conveying module is connected to the supporting platform through the lifting module, and the supporting platform is provided with a terahertz reflector.

[0011] Furthermore, a terahertz linear detector is provided on the conveying module, and the terahertz linear detector is located at a position far away from the terahertz emission source.

[0012] Furthermore, a terahertz emission source is provided on the lifting module.

[0013] Furthermore, the lifting module drives the supporting platform together with the terahertz reflector and the terahertz emission source to rise or fall.

[0014] Furthermore, there is a shell which covers the mechanical auxiliary unit and is used to protect the terahertz emission source, the terahertz linear detector and the terahertz reflector.

[0015] Furthermore, a temperature regulating device is provided in the shell to control the ambient temperature in the shell to ensure that the desired imaging effect is achieved.

[0016] A second aspect of the present invention provides a working method of a portable terahertz security inspection device capable of automatic detection, comprising the following steps:

[0017] Mechanical auxiliary unit starts;

[0018] The terahertz emission source, terahertz linear detector and automatic detection platform were started;

[0019] The items to be inspected enter the inspection area from the entrance and are transported out from the exit through the conveying module. During the transportation process, the terahertz wave source emits terahertz radiation, which penetrates the sample to be inspected and is received by the terahertz linear detector and converted into image information. The type and location of the dangerous goods are determined through the image information.

[0020] Furthermore, the positions of the terahertz emission source and the terahertz linear detector are adjusted by changing the height of the lifting module and the speed of the conveying module, so as to drive the object to be tested to reach the set detection position.

[0021] Furthermore, the automatic detection platform determines the type and location of dangerous goods based on image information and issues a warning. After the original image is enhanced, features are extracted using a deep convolutional neural network, the category of dangerous goods is determined based on the extracted features, and the target frame is calibrated, and different warning signals are issued according to the category of dangerous goods.

[0022] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0023] The use of miniaturized terahertz wave emission and detection units effectively reduces the size and weight of the whole machine, greatly improving the convenience of carrying and rapid deployment; the system uses terahertz imaging technology, and the detection performance is more comprehensive and reliable, which can effectively identify dangerous goods of various materials such as ceramics, plastic liquid containers, powdered substances, etc.; the use of deep learning target detection algorithm replaces the previous simple matching method, and realizes faster and more accurate automatic detection, identification and early warning, reduces the false alarm rate, and enhances the user experience; modular and networked design ensures the flexible expansion and upgrade of system functions, and users can optimize and replace image target detection algorithms or add new detection modules according to actual needs; the human-computer interaction interface is simple and intuitive, and the one-button automatic operation mode reduces the user's work intensity. The visual images generated by the detection and clear dangerous goods prompts ensure the clarity of the detection process and results. Through the above innovative design, this equipment is adapted to the security inspection tasks in special environments such as temporary public activities. The work efficiency, accuracy and ease of use are all higher than similar equipment in the industry. It will effectively help customers improve the prevention and security inspection capabilities in public areas and has broad market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 is a schematic structural diagram of a portable terahertz security inspection device capable of automatic detection provided by one or more embodiments of the present invention;

[0026] Figure 2 It is a schematic diagram of the working state of the lifting module of the portable terahertz security inspection device provided by one or an embodiment of the present invention;

[0027] Figure 3 It is a structural schematic diagram of a lifting module of a portable terahertz security inspection device provided by one or an embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of the working process of the automatic detection platform of the portable terahertz security inspection device provided by one or an embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of a YOLO target detection training process of a portable terahertz security inspection device provided by one or an embodiment of the present invention;

[0030] Figure 6 It is a schematic diagram of a YOLO target detection algorithm in a portable terahertz security inspection device provided by one or an embodiment of the present invention;

[0031] Figure 7It is a schematic diagram of the YOLOV 8 model in the portable terahertz security inspection device provided by one or an embodiment of the present invention.

[0032] In the figure, 1 is a terahertz emission source, 2 is a terahertz linear detector, 3 is a terahertz reflector, 4 is a mechanical auxiliary unit, 41 includes a lifting module, 42 is a conveying module, 43 is a supporting platform, 5 is an automatic detection platform, 6 is a temperature regulating device, 7 is a re-inspection table, and 8 is a shell. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] Embodiment 1:

[0036] like Figure 1-Figure 3 As shown, a portable terahertz security inspection device capable of automatic detection includes a terahertz emission source 1, a terahertz linear detector 2, a terahertz reflector 3, a mechanical auxiliary unit 4 and an automatic detection platform 5. The mechanical auxiliary unit 4 includes a lifting module 41, a conveying module 42 and a supporting platform 43.

[0037] The conveying module 42 is used to carry the object or sample to be tested, and the lifting module 41 is arranged on the conveying module 42 and is movably connected to the supporting platform 43, and is used to drive the supporting platform 43 to rise or fall. The terahertz reflector 3 is arranged on the supporting platform 43, the terahertz emission source 1 is arranged on the lifting module 41, and the terahertz linear detector 2 is arranged on the conveying module 42.

[0038] The terahertz wave source emits terahertz radiation, which penetrates the sample to be detected, and is then received by the terahertz linear detector and converted into image information. After the automatic detection platform receives the image information, it performs preliminary integration and enhancement on the input image through the image preprocessing module, and then extracts the relevant features of the target area through the deep convolutional neural network and target detection algorithm, identifies the possible dangerous goods category, and automatically calibrates each target box, and finally issues an alarm to achieve the dangerous goods detection task.

[0039] In this embodiment, the mechanical auxiliary unit 4 includes a conveying module 42 for carrying an object or sample to be tested, and a terahertz linear detector 2 is provided on the conveying module 42, and the terahertz linear detector 2 is located at a position far away from the terahertz emission source 1; the conveying module 42 is connected to a supporting platform 43 through a lifting module 41, and a terahertz reflector 3 is provided on the supporting platform 43, and a terahertz emission source 1 is provided on the lifting module 41, and the lifting module 41 drives the supporting platform 43 together with the terahertz reflector 3 and the terahertz emission source 1 to rise or fall.

[0040] The housing 8 is covered on the mechanical auxiliary unit 4, enclosing the terahertz emission source, terahertz linear detector, terahertz reflector and other devices to form a terahertz light path for security inspection. The security inspection housing is used to separate the inspected objects from the external environment to reduce the interference of electromagnetic radiation in the external environment on the detection results.

[0041] A temperature regulating device 6 is provided in the housing 8 to control the temperature of the entire environment and ensure that the device achieves a suitable imaging effect.

[0042] Embodiment 2:

[0043] A working method of a portable terahertz security inspection device capable of automatic detection comprises the following steps:

[0044] Step 1: Start the mechanical auxiliary unit 4, which will automatically adjust the height of the lifting module, the speed of the conveying module, and the positions of the terahertz emission source and the terahertz linear detector.

[0045] Step 2: start the terahertz emission source 1, the terahertz linear detector 2, and the automatic detection platform 5.

[0046] Step 3: Put the luggage to be inspected into port A and transport it out of port B through the conveying module 42. During the transportation process, the terahertz wave source 1 emits terahertz radiation, which penetrates the sample to be inspected and is then received by the terahertz linear detector 2 and converted into image information.

[0047] Step 4: The automatic detection platform automatically detects the type and location of dangerous goods and issues an alarm. Figure 4 As shown in the figure, the automatic detection platform generates the original image, and the input image is enhanced by the preprocessing module, and then input into the deep convolutional neural network to extract features, and then through the YOLOv8 structure as shown in the figure. Figure 5-Figure 7 As shown in the figure, the possible dangerous goods category is determined based on the extracted features, and the target frame is automatically calibrated. If it is a dangerous goods, different sound and light signal alarms are implemented according to the dangerous goods category. If not, the next image is cycled.

[0048] Step 5: Unpack the suspected dangerous goods for inspection. Unpacking and inspection uses a re-inspection table 7, which is located at one end of the automatic inspection platform. When the equipment detects that there are prohibited items in the luggage, the items need to be taken to the re-inspection table for careful inspection.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A portable terahertz security inspection device capable of automatic detection, characterized in that: include: The mechanical auxiliary unit is used to drive the object to be tested to move, so that the terahertz wave source emits terahertz radiation, which penetrates the sample to be tested, is received by the terahertz linear detector and converted into image information; The automatic detection platform is used to receive image information and perform preliminary integration and enhancement on the input images through the image preprocessing module. It uses a deep convolutional neural network to identify possible dangerous goods categories, calibrate each target box, and issue an early warning.

2. A portable terahertz security inspection device capable of automatic detection as claimed in claim 1, characterized in that: The mechanical auxiliary unit comprises a conveying module for carrying the object or sample to be tested, the conveying module is connected to a supporting platform via a lifting module, and a terahertz reflector is arranged on the supporting platform.

3. A portable terahertz security inspection device capable of automatic detection as claimed in claim 2, characterized in that: The conveying module is provided with a terahertz linear detector, and the terahertz linear detector is located at a position far away from the terahertz emission source.

4. A portable terahertz security inspection device capable of automatic detection as claimed in claim 2, characterized in that: The lifting module is provided with a terahertz emission source.

5. The portable terahertz security inspection device capable of automatic detection as claimed in claim 4, characterized in that: The lifting module drives the supporting platform together with the terahertz reflector and the terahertz emission source to rise or fall.

6. The portable terahertz security inspection device capable of automatic detection as claimed in claim 2, characterized in that: The device also has a shell, which covers the mechanical auxiliary unit and is used for protecting the terahertz emission source, the terahertz linear detector and the terahertz reflector.

7. The portable terahertz security inspection device capable of automatic detection according to claim 6, characterized in that: A temperature regulating device is arranged inside the shell to control the ambient temperature inside the shell to ensure that the desired imaging effect is achieved.

8. A working method of the portable terahertz security inspection device according to any one of claims 1 to 7, comprising the following steps: Mechanical auxiliary unit starts; The terahertz emission source, terahertz linear detector and automatic detection platform were started; The items to be inspected enter the inspection area from the entrance and are transported out from the exit through the conveying module. During the transportation process, the terahertz wave source emits terahertz radiation, which penetrates the sample to be inspected and is received by the terahertz linear detector and converted into image information. The type and location of the dangerous goods are determined through the image information.

9. The working method of the portable terahertz security inspection device capable of automatic detection as claimed in claim 8, characterized in that: By changing the height of the lifting module and the speed of the conveying module, the positions of the terahertz emission source and the terahertz linear detector are adjusted to drive the object to be tested to the set detection position.

10. The working method of a portable terahertz security inspection device capable of automatic detection as claimed in claim 8, wherein the automatic detection platform determines the type and location of dangerous goods based on image information and issues an early warning; after the original image is enhanced, features are extracted using a deep convolutional neural network, the category of dangerous goods is determined based on the extracted features, and the target frame is calibrated, and different early warning signals are issued based on the category of dangerous goods.

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