CN213689981U - Terahertz security inspection device with eddy current effect - Google Patents
Terahertz security inspection device with eddy current effect Download PDFInfo
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- CN213689981U CN213689981U CN202022793451.9U CN202022793451U CN213689981U CN 213689981 U CN213689981 U CN 213689981U CN 202022793451 U CN202022793451 U CN 202022793451U CN 213689981 U CN213689981 U CN 213689981U
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Abstract
The utility model discloses a fuse terahertz of eddy current effect safety inspection device now relates to terahertz technical field now. The security inspection device comprises a metal screening circuit, a terahertz signal receiving circuit and a signal processing module, wherein the signal output end of the metal screening circuit is connected with the signal input end of the signal processing module, and the metal screening circuit is used for detecting whether an object is a metal object; the signal output end of the terahertz signal receiving circuit is connected with the signal input end of the signal processing module and is used for detecting a non-metal object; the signal processing module is used for receiving the information collected by the metal discrimination circuit and the terahertz signal receiving circuit and processing the received information. The security inspection device can be used for discriminating whether an object is a metal substance or not, so that the security inspection device is more convenient to use.
Description
Technical Field
The utility model relates to a terahertz technical field especially relates to a fuse terahertz security inspection device of eddy current effect.
Background
The terahertz wave is an electromagnetic wave with the frequency range of 0.1 THz-10 THz, can penetrate through substances such as metal, ceramic, fat, plastic and the like, has low photon energy, does not have ionizing radiation to a human body, and is very suitable for detecting hidden substances in the skin and clothes of the human body.
At present, terahertz equipment for human body security inspection imaging is available at home and abroad, for example, a boc-m terahertz human body security inspection instrument developed by thirty-eighth national electronic technology group. The terahertz security check instrument system is divided into a passive security check system and an active security check system, the passive security check system detects through receiving electromagnetic waves radiated by a human body, and the terahertz security check instrument system has the advantages of safety, no radiation, high detection efficiency and the like, but has poor resolution; the active security inspection system transmits terahertz waves with dosage receivable by a human body and then receives reflected waves of detection substances to complete detection, has the characteristic of high resolution, but is higher in cost.
The existing terahertz security inspection equipment can only finish the detection of various substances, but cannot discriminate whether the detected substance is metal or not. To solve this problem, a new form of terahertz security check instrument system needs to be developed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem how to provide a can examine whether the object is metallics, make its use more convenient terahertz security inspection device who fuses the eddy current effect.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: the utility model provides a fuse terahertz of eddy current effect safety inspection device which characterized in that: the terahertz signal detection circuit comprises a metal discrimination circuit, a terahertz signal receiving circuit and a signal processing module, wherein a signal output end of the metal discrimination circuit is connected with a signal input end of the signal processing module, and the metal discrimination circuit is used for detecting whether an object is a metal object; the signal output end of the terahertz signal receiving circuit is connected with the signal input end of the signal processing module and is used for detecting a non-metal object; the signal processing module is used for receiving the information collected by the metal discrimination circuit and the terahertz signal receiving circuit and processing the received information.
The further technical scheme is as follows: the metal discriminating circuit comprises a high-frequency oscillation circuit and an oscillation detecting circuit, wherein the signal output end of the high-frequency oscillation circuit is connected with the signal input end of the oscillation detecting circuit, and the high-frequency oscillation circuit is used for inducing whether an object is metal or not through a generated magnetic field; the signal output end of the oscillation detection circuit is connected with the signal input end of the signal processing module, the oscillation detection circuit is used for converting an input alternating current signal into weak direct current voltage, and a metal flag bit is generated by judging the change of the voltage and transmitted to the signal processing module.
The further technical scheme is as follows: the terahertz signal receiving circuit comprises an antenna, a terahertz low-noise amplifier chip, a terahertz detector and a video amplifier, wherein the antenna is connected with the signal input end of the terahertz low-noise amplifier chip and is used for receiving electromagnetic waves radiated by an object; the signal output end of the terahertz low-noise amplifier chip is connected with the signal input end of the terahertz detector, and the terahertz low-noise amplifier chip is used for amplifying the received electromagnetic waves; the signal output end of the terahertz detector is connected with the signal input end of the video amplifier, and the terahertz detector is used for processing the amplified signal and outputting a direct-current voltage signal; the signal output end of the video amplifier is connected with the signal input end of the signal processing module, and the video amplifier is used for amplifying an input direct-current voltage signal.
The further technical scheme is as follows: the device also comprises an alarm module, wherein the alarm module is connected with the signal output end of the signal processing module and is used for sending out an alarm signal under the control of the signal processing module.
The further technical scheme is as follows: the safety inspection device further comprises a power supply module, wherein the power supply module is used for realizing charging and discharging, is connected with a power supply input end of a module needing power supply in the safety inspection device and provides a working power supply for the module needing power supply in the safety inspection device.
The further technical scheme is as follows: the safety inspection device further comprises a downloading unit, wherein the downloading unit is connected with the signal processing module in a two-way mode and is used for downloading the control program to the terahertz safety inspection instrument in the early stage.
The further technical scheme is as follows: the security inspection device also comprises a serial communication unit, and the serial communication unit is bidirectionally connected with the signal processing module and is used for being connected with peripheral equipment.
The further technical scheme is as follows: the safety inspection device also comprises a human-computer interaction module, wherein the human-computer interaction module is connected with the signal processing module in a two-way mode and is used for inputting control commands and displaying output data.
Preferably, the human-computer interaction module comprises a key module connected with the signal input end of the signal processing module and a display module connected with the signal output end of the signal processing module; or the man-machine interaction module comprises a touch screen which is connected with the signal processing module in a two-way mode.
The further technical scheme is as follows: the signal processing module comprises an A-D conversion module and a data processing chip, and the signal output end of the A-D conversion module is connected with the signal input end of the data processing chip.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: when the terahertz security inspection device detects an object, the signal receiving module transmits the acquired electromagnetic waves to the signal processing module by using an antenna, a low-noise amplifier chip and the like, and if the object is metal, the metal discrimination circuit induces the object to generate a marking signal by using an eddy current effect; the signal processing module carries out denoising processing and real-time dynamic analysis by utilizing a field programmable gate array technology, and finally completes discrimination driving alarm systems (buzzing, vibrating, lighting and other forms) for abnormal signals. The terahertz security inspection device fused with the eddy current effect can realize screening of metal substances; the detection time is short, and the time for completing the detection of the hidden substances and the screening of the metal substances by the equipment is 1-2 s; small volume, low cost and mass production.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic block diagram of a security inspection device according to an embodiment of the present invention;
fig. 2 is a signal processing flow chart of the case device according to the embodiment of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention are 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 some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As shown in figure 1, the embodiment of the utility model discloses a terahertz security inspection device that fuses eddy current effect, including metal discriminator circuit, terahertz signal receiving circuit and signal processing module, the signal output part of metal discriminator circuit is connected with signal processing module's signal input part, metal discriminator circuit is used for detecting whether the object is the metal object; the signal output end of the terahertz signal receiving circuit is connected with the signal input end of the signal processing module and is used for detecting a non-metal object; the signal processing module is used for receiving the information collected by the metal discrimination circuit and the terahertz signal receiving circuit and processing the received information.
When the terahertz security inspection device detects an object, the signal receiving module transmits the acquired electromagnetic waves to the signal processing module by using an antenna, a low-noise amplifier chip and the like, and if the object is metal, the metal discrimination circuit induces the object to generate a marking signal by using an eddy current effect; the signal processing module carries out denoising processing and real-time dynamic analysis by utilizing a field programmable gate array technology, and finally completes discrimination driving alarm systems (buzzing, vibrating, lighting and other forms) for abnormal signals.
Further, as shown in fig. 1, the metal discriminating circuit includes a high-frequency oscillation circuit and an oscillation detecting circuit, a signal output end of the high-frequency oscillation circuit is connected to a signal input end of the oscillation detecting circuit, and the high-frequency oscillation circuit is configured to sense whether an object is a metal or not by a generated magnetic field; the signal output end of the oscillation detection circuit is connected with the signal input end of the signal processing module, the oscillation detection circuit is used for converting an input alternating current signal into weak direct current voltage, and a metal flag bit is generated by judging the change of the voltage and transmitted to the signal processing module.
Further, as shown in fig. 1, the terahertz signal receiving circuit includes an antenna, a terahertz low-noise amplifier chip, a terahertz detector, and a video amplifier, the antenna is connected to a signal input end of the terahertz low-noise amplifier chip, and the antenna is configured to receive an electromagnetic wave radiated by an object; the signal output end of the terahertz low-noise amplifier chip is connected with the signal input end of the terahertz detector, and the terahertz low-noise amplifier chip is used for amplifying the received electromagnetic waves; the signal output end of the terahertz detector is connected with the signal input end of the video amplifier, and the terahertz detector is used for processing the amplified signal and outputting a direct-current voltage signal; the signal output end of the video amplifier is connected with the signal input end of the signal processing module, and the video amplifier is used for amplifying an input direct-current voltage signal.
Furthermore, when the system is powered on, if metal is in contact with a magnetic field generated by a high-frequency oscillation circuit in the metal screening circuit, a weak signal can be generated, the signal is amplified by a triode and then transmitted to an oscillation detection circuit, the oscillation detection circuit converts an input alternating current signal into weak direct current voltage around 0V, and a metal mark bit is generated by judging the change of the voltage and transmitted to the signal processing module. When the measured substance is nonmetal, the metal discrimination circuit can not be started; meanwhile, electromagnetic waves radiated by a measured substance are input to the terahertz low-noise amplifier chip through the horn antenna for amplification, the terahertz detector detects the electromagnetic waves and outputs the amplified electromagnetic waves as direct-current voltage, and the direct-current voltage signals are transmitted to the signal processing module through the video amplifier.
The signal processing module comprises an analog-to-digital conversion acquisition module and a data processing chip, as shown in figure 2, the analog-to-digital conversion acquisition module completes the analog-to-digital conversion of a direct-current voltage signal, a high-precision 16-bit AD7606 chip is utilized, a plurality of channels are utilized to simultaneously acquire data so as to improve the accuracy of the terahertz security inspection device, the acquired data are transmitted to the data processing chip, the field programmable gate array technology is utilized to complete the noise reduction and real-time dynamic analysis of the signal, and a mark signal is generated by comparing the signal with a preset threshold value so as to drive the alarm system to give an alarm.
Further, as shown in fig. 1, the device further includes an alarm module, where the alarm module is connected to the signal output end of the signal processing module and is configured to send an alarm signal under the control of the signal processing module, where the sent alarm signal may be an independent sound or light alarm or a sound and light alarm at the same time, and a person skilled in the art may set a specific form of the alarm signal as needed, which is not described herein again.
Further, as shown in fig. 1, the security inspection apparatus further includes a power module, where the power module is used to implement charging and discharging, is connected to a power input end of a module that needs to supply power in the security inspection apparatus, and provides a working power supply for the module that needs to supply power in the security inspection apparatus, and a specific form of the power module is the prior art, and a person skilled in the art can select the module as needed, which is not described herein.
Further, as shown in fig. 1, the security inspection device further includes a downloading unit, and the downloading unit is connected to the signal processing module in a bidirectional manner and is used for downloading the control program to the terahertz security inspection instrument in an earlier stage. The security inspection device also comprises a serial communication unit, and the serial communication unit is bidirectionally connected with the signal processing module and is used for being connected with peripheral equipment.
Further, as shown in fig. 1, the security inspection apparatus further includes a human-computer interaction module, which is connected to the signal processing module in a bidirectional manner and is configured to input a control command and display output data. The specific forms of the human-computer interaction module are at least two types as follows: the human-computer interaction module comprises a key module connected with a signal input end of the signal processing module and a display module connected with a signal output end of the signal processing module; secondly, the man-machine interaction module comprises a touch screen which is connected with the signal processing module in a bidirectional mode.
In conclusion, the security inspection device can realize the discrimination of metal substances, the detection time is short, the time for completing the detection of the hidden substances and the discrimination of the metal substances by the device is 1-2s, the volume is small, the cost is low, and the mass production can be realized.
Claims (10)
1. The utility model provides a fuse terahertz of eddy current effect safety inspection device which characterized in that: the terahertz signal detection circuit comprises a metal discrimination circuit, a terahertz signal receiving circuit and a signal processing module, wherein a signal output end of the metal discrimination circuit is connected with a signal input end of the signal processing module, and the metal discrimination circuit is used for detecting whether an object is a metal object; the signal output end of the terahertz signal receiving circuit is connected with the signal input end of the signal processing module and is used for detecting a non-metal object; the signal processing module is used for receiving the information collected by the metal discrimination circuit and the terahertz signal receiving circuit and processing the received information.
2. The terahertz security inspection device fused with the eddy current effect as claimed in claim 1, wherein: the metal discriminating circuit comprises a high-frequency oscillation circuit and an oscillation detecting circuit, wherein the signal output end of the high-frequency oscillation circuit is connected with the signal input end of the oscillation detecting circuit, and the high-frequency oscillation circuit is used for inducing whether an object is metal or not through a generated magnetic field; the signal output end of the oscillation detection circuit is connected with the signal input end of the signal processing module, the oscillation detection circuit is used for converting an input alternating current signal into weak direct current voltage, and a metal flag bit is generated by judging the change of the voltage and transmitted to the signal processing module.
3. The terahertz security inspection device fused with the eddy current effect as claimed in claim 1, wherein: the terahertz signal receiving circuit comprises an antenna, a terahertz low-noise amplifier chip, a terahertz detector and a video amplifier, wherein the antenna is connected with the signal input end of the terahertz low-noise amplifier chip and is used for receiving electromagnetic waves radiated by an object; the signal output end of the terahertz low-noise amplifier chip is connected with the signal input end of the terahertz detector, and the terahertz low-noise amplifier chip is used for amplifying the received electromagnetic waves; the signal output end of the terahertz detector is connected with the signal input end of the video amplifier, and the terahertz detector is used for processing the amplified signal and outputting a direct-current voltage signal; the signal output end of the video amplifier is connected with the signal input end of the signal processing module, and the video amplifier is used for amplifying an input direct-current voltage signal.
4. The terahertz security inspection device fused with the eddy current effect as claimed in claim 1, wherein: the device also comprises an alarm module, wherein the alarm module is connected with the signal output end of the signal processing module and is used for sending out an alarm signal under the control of the signal processing module.
5. The terahertz security inspection device fused with the eddy current effect as claimed in claim 1, wherein: the safety inspection device further comprises a power supply module, wherein the power supply module is used for realizing charging and discharging, is connected with a power supply input end of a module needing power supply in the safety inspection device and provides a working power supply for the module needing power supply in the safety inspection device.
6. The terahertz security inspection device fused with the eddy current effect as claimed in claim 1, wherein: the safety inspection device further comprises a downloading unit, wherein the downloading unit is connected with the signal processing module in a two-way mode and is used for downloading the control program to the terahertz safety inspection instrument in the early stage.
7. The terahertz security inspection device fused with the eddy current effect as claimed in claim 1, wherein: the security inspection device also comprises a serial communication unit, and the serial communication unit is bidirectionally connected with the signal processing module and is used for being connected with peripheral equipment.
8. The terahertz security inspection device fused with the eddy current effect as claimed in claim 1, wherein: the safety inspection device also comprises a human-computer interaction module, wherein the human-computer interaction module is connected with the signal processing module in a two-way mode and is used for inputting control commands and displaying output data.
9. The terahertz security inspection device fused with the eddy current effect as claimed in claim 8, wherein: the man-machine interaction module comprises a key module connected with the signal input end of the signal processing module and a display module connected with the signal output end of the signal processing module, or the man-machine interaction module comprises a touch screen connected with the signal processing module in a two-way mode.
10. The terahertz security inspection device fused with the eddy current effect as claimed in claim 1, wherein: the signal processing module comprises an A-D conversion module and a data processing chip, and the signal output end of the A-D conversion module is connected with the signal input end of the data processing chip.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113625351A (en) * | 2021-08-17 | 2021-11-09 | 上海亨临光电科技有限公司 | Method for feeding back voltage value of detector channel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113625351A (en) * | 2021-08-17 | 2021-11-09 | 上海亨临光电科技有限公司 | Method for feeding back voltage value of detector channel |
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