CN115951421B - Channel type terahertz active imaging human body security check instrument - Google Patents
Channel type terahertz active imaging human body security check instrument Download PDFInfo
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- 230000005855 radiation Effects 0.000 claims abstract description 9
- 239000007787 solid Substances 0.000 claims description 12
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Abstract
The application provides a channel type terahertz active imaging human body security check instrument which comprises a first box body, a second box body, a third box body, a fourth box body and a detection door, wherein the first box body, the second box body, the third box body and the fourth box body are mutually fixed through a frame, and a set of terahertz imaging system is respectively arranged in the second box body and the fourth box body; the frame of the security inspection instrument is divided into three parts, namely a frame for fixedly installing a metal detection door, a frame for installing and fixing two sets of active detection light sources and camera structures and a frame for connecting the two sets of active detection light sources and camera structures and wires, the three parts are connected to form the integral appearance of the security inspection instrument, and the security inspection instrument is convenient to install and disassemble and convenient to transport and maintain. The terahertz wave scanning device scans an object to be detected by radiating terahertz waves, has small radiation and low energy consumption, can effectively reduce ionization influence on human bodies or biological tissues, can perform nondestructive detection on the human bodies or the biological tissues, and reduces radiation damage.
Description
Technical Field
The application relates to the technical field of security inspection, in particular to a channel terahertz active imaging human body security inspection instrument.
Background
Terahertz waves refer to electromagnetic radiation having a frequency in the range of 0.1 to 10THz (wavelength 3000 to 30 microns). The wavelength band of which lies in a fairly broad range of electromagnetic radiation between microwave and infrared. The photon energy of the terahertz light is meV (millielectron volt), which is harmless to human body, and the active terahertz light source can penetrate clothes, plastics and other materials to realize active imaging detection on human body.
The existing domestic security inspection mode mainly adopts personnel and goods separation inspection, the goods are inspected by X-rays, the human body inspection mainly comprises metal detection, body searching and unpacking inspection, the time and the labor are consumed, and the personal privacy is also easily violated. In the traditional security inspection mode, the ionizing radiation of X rays is large, so that the goods can be effectively inspected, and the method cannot be used for human security inspection. Only the metal detector is used for security inspection of the human body, only specific metal objects can be inspected, the false alarm rate is high, and the most traditional searching mode can damage personal privacy and the like. For places with large flow, complex personnel and high passing speed requirements of subway and the like, non-contact, rapid and accurate human body security inspection equipment is more needed.
The existing terahertz security inspection modes mainly comprise passive terahertz security inspection and active terahertz security inspection, wherein the passive terahertz security inspection principle is to image by utilizing weak terahertz radiation signals emitted by a human body or an object, detected electromagnetic waves are millimeter waves, and compared with terahertz waves (sub-millimeter waves), the passive terahertz security inspection mode is low in passive radiation signal intensity, poor in signal-to-noise ratio and low in imaging spatial resolution. The active terahertz security inspection instrument is used for emitting and receiving terahertz light, the signal intensity is high, the signal-to-noise ratio of the signal is high, the wavelength of terahertz waves is shorter, and the imaging resolution is higher. For the active terahertz security inspection system, the reflection imaging effect is best, but the rapid human body security inspection when the human flow is large cannot be realized, so that an optical path system capable of receiving diffuse reflection back after the emission of an active light source is needed to detect articles on a human body is designed, the irradiation range of the security inspection instrument on a detected object is enlarged, the irradiation angle requirement is lowered, and comprehensive judgment is performed by other means, so that accurate active rapid human body security inspection is possible.
At present, few products truly using terahertz wave bands for active imaging are very few, mainly because terahertz light sources suitable for production are adopted, the focal plane detection imaging technology of terahertz waves is also in the optimized development, and the inventor obtains an active terahertz human body security inspection instrument with multiple functions, high imaging precision, real-time imaging and high reliability through design, development and test, and is suitable for carrying out rapid human body security inspection on public places with large human flow such as subway openings, high-speed rail stations and the like.
Disclosure of Invention
The present application aims to provide a channel terahertz active imaging human body security inspection instrument which overcomes or at least partially solves the above-mentioned problems.
In order to achieve the above purpose, the technical scheme of the application is specifically realized as follows:
the application provides a channel type terahertz active imaging human body security inspection instrument which comprises a first box body, a second box body, a third box body, a fourth box body, a detection door, a solid source, a receiving lens barrel and a terahertz camera, and is characterized in that the first box body, the second box body, the third box body and the fourth box body are mutually fixed through frames, and a set of terahertz imaging system is respectively arranged in the second box body and the fourth box body; the frame is divided into three parts, namely a frame for fixedly installing a metal detection door, a frame for installing and fixing two sets of active detection light sources and camera structures and a frame for connecting the two sets of active detection light sources and the camera structures and wiring, and the three parts are connected to form the integral appearance of the security inspection instrument.
According to a further scheme, the terahertz camera is a 200GHz focal plane camera, and the sensitivity can reach the picowatt level.
As a further scheme of the application, the terahertz imaging optical path system is divided into two independent systems which are respectively arranged in two security check instrument frames, and the two systems are arranged in a staggered manner face to face manner so as to avoid the influence of the energy of one set of light source on the detection result caused by the energy entering the other set of camera, wherein each system comprises two GHz solid frequency doubling sources, one terahertz camera, four focusing lenses, four plane reflecting mirrors, a receiving lens barrel and a bracket for fixing all devices.
As a further scheme of the application, terahertz light emitted by the solid source is divided into two beams through the double-end waveguide antenna, and one beam is expanded through the first focusing lens and directly irradiates the measured object; the other beam passes through the second focusing lens and then sequentially passes through the first reflecting mirror and the second reflecting mirror, terahertz light is emitted from the right left side of the lens barrel and irradiates the object to be measured, the lower solid source is the same, the terahertz light is emitted from the lower side and the right side of the lens barrel and irradiates the object to be measured, the whole system is provided with four light sources and irradiates the object to be measured at the same time, so that the irradiation of multiple light sources with multiple angles increases the imaging output energy, and the diffuse reflection light of all or part of imaging areas returns to the terahertz camera after the lens barrel for imaging no matter what angle the dangerous article is arranged on the surface of the object to be measured.
As a further scheme of the application, the lens barrel is composed of a third lens, a fourth lens, a fifth lens and a lens barrel shell, the focal lengths of the third lens, the fourth lens and the fifth lens are different, the distance between the lenses can be adjusted through screw thread rotation of the shell between the lenses, so that the purpose of adjusting imaging effect is achieved, and the terahertz camera is fixed at the tail end of the lens barrel.
As a further scheme of the application, the detection door is positioned at the entrance of the security inspection instrument, and plays roles in primarily judging the positions of metal articles, counting the number of people and triggering the terahertz imaging system to start the image acquisition function.
The application provides a channel type terahertz active imaging human body security check instrument, which has the beneficial effects that: the terahertz waves are radiated to scan the object to be detected, so that the radiation is small, the energy consumption is low, the ionization influence on the human body or biological tissues can be effectively reduced, the nondestructive detection can be carried out on the human body or biological tissues, and the radiation damage is reduced; the detection signal of the object to be detected is obtained by covering radiation of the object to be detected and adopting a terahertz detection module with the minimum side length of the light sensitive surface being larger than or equal to the maximum side length of the imaging area of the imaging objective lens, and the complete detection data of the object to be detected can be obtained by one-time radiation, so that the detection efficiency is high.
Drawings
For a clearer description of the technical solutions of embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained by those skilled in the art without inventive effort:
FIG. 1 is a three-dimensional block diagram of the present application;
FIG. 2 is a view showing the construction of the inside of the case of the present application;
FIG. 3 is a structural view of a lens barrel according to the present application;
fig. 4 is a schematic diagram of a person's path of passage according to the present application.
In the figure: 1. a first case; 2. a second case; 3. a third case; 4. a fourth case; 5. detecting a door; 6. an infrared camera; 7. an infrared thermometer; 8. a terahertz solid frequency doubling source; 9. a waveguide antenna; 10. a first focusing lens; 11. a second condenser lens; 12. a first mirror; 13. a second mirror; 14. a lens barrel; 15. a third lens; 16. a fourth focusing lens; 17. a fifth focusing lens; 18. terahertz cameras.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings, in which exemplary embodiments of the present disclosure are shown, it should be understood, however, that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein, but rather, these embodiments are provided so that the disclosure may be more thoroughly understood and to fully convey the scope of the present disclosure to those skilled in the art.
Referring to fig. 1-4, the channel terahertz active imaging human body security inspection instrument provided by the embodiment of the application comprises a first box body 1, a second box body 2, a third box body 3, a fourth box body 4 and a detection door 5, wherein the first box body 1, the second box body 2, the third box body 3 and the fourth box body 4 are mutually fixed through frames, and a set of terahertz imaging system is respectively arranged in the second box body 2 and the fourth box body 4.
The frame of the security inspection instrument is divided into three parts, namely a frame for fixedly installing a metal detection door, a frame for installing and fixing two sets of active detection light sources and camera structures and a frame for connecting the two sets of active detection light sources and camera structures and wires, the three parts are connected to form the integral appearance of the security inspection instrument, and the security inspection instrument is convenient to install and disassemble and convenient to transport and maintain.
The terahertz camera 18 is a 220GHz focal plane camera, the sensitivity can reach the picowatt level, the terahertz imaging optical path system is divided into two independent systems which are respectively arranged in two security check instrument frames, the two systems are placed in a staggered way in a face-to-face manner, so that the influence on the detection result caused by the light source energy of one set entering the one set of camera is avoided, and each set of system comprises two 220GHz solid frequency doubling sources, one terahertz camera, four focusing lenses, four plane reflecting mirrors and one bracket for receiving lens barrels and all devices of a strand.
As shown in fig. 2, the terahertz light emitted from the solid source 8 is split into two beams by the double-ended waveguide antenna 9, one beam is expanded by the first focusing lens 10 and directly irradiates the object to be measured, the other beam passes through the second focusing lens 11 and then sequentially passes through the reflecting mirror 12 and the reflecting mirror 13, the terahertz light is emitted from the right left side of the lens barrel 14 and irradiates the object to be measured, the solid source below the terahertz light is the same, the terahertz light is emitted from the lower side and the right side of the lens barrel 14 and irradiates the object to be measured, so that the whole system has four light sources and irradiates the object to be measured simultaneously, the irradiation of multiple light sources with multiple angles increases the imaging output energy, and the diffuse reflection light of all or part of the imaging area returns to the terahertz camera for imaging no matter what angle the dangerous object is arranged on the surface of the object to be measured.
As shown in fig. 3, the receiving lens barrel 14 is composed of a third lens 15, a fourth lens 16, a fifth lens 17 and a lens barrel housing, the third lens 15, the fourth lens 16 and the fifth lens 17 have different focal lengths, the distance between the lenses can be adjusted by screw rotation of the housing, so as to achieve the purpose of adjusting the imaging effect, and the terahertz camera 18 is fixed at the end of the lens barrel.
The metal detection door 5 is positioned at the entrance of the security inspection instrument, and plays roles in primarily judging the positions of metal articles, counting the number of people and triggering the terahertz imaging system to start the image acquisition function.
In the use process, as shown in fig. 4, after the installation of the security inspection instrument is finished, the end side of the security inspection instrument is provided with the isolation belt to prevent personnel from passing through the two sides; when the security inspection is formally performed, a person to be detected enters the security inspection door from the outside, when the security inspection door reaches the point A, metal detection is triggered, the metal detection door can preliminarily judge the shape and the size of a metal object carried by the person to be detected, and meanwhile, the infrared cameras 6 and 1 and the infrared thermometer 7 collect image data, measure the temperature and count the person to be detected; the point A also triggers the terahertz imaging system to start to collect images, and in the process that a tested person reaches the point B through the point A, the terahertz imaging system of the No. 4 box body can shoot terahertz images of the front faces of a plurality of human bodies; the testee turns from the point B to the point C, the process is divided into a plurality of terahertz images of the left side and the right side of the human body by a box body No. 4 and a box body No. 2, the testee continues to turn around through the point C to reach the point D, and the testee can be shot with a plurality of terahertz images of the back; and the comprehensive processing and judging functions of the image are triggered after the point D is reached, and the comprehensive judgment of whether the detected person carries dangerous goods or not is carried out according to the results of terahertz imaging and metal detection, so that the measuring accuracy is high.
The above is only an example of the present application and is not intended to limit the present application; various modifications and variations of the present application will be apparent to those skilled in the art; any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (3)
1. The channel type terahertz active imaging human body security inspection instrument comprises a first box body (1), a second box body (2), a third box body (3), a fourth box body (4), a detection door (5), a solid source (8), a lens barrel (14) and a terahertz camera (18), and is characterized in that the first box body (1), the second box body (2), the third box body (3) and the fourth box body (4) are mutually fixed through frames, and a set of terahertz imaging system is respectively arranged in the second box body (2) and the fourth box body (4); the frame is divided into three parts, namely a frame for fixedly mounting a metal detection door, a frame for mounting and fixing two sets of active detection light sources and camera structures and a frame for connecting the two sets of active detection light sources, the camera structures and wires, and the three parts are connected to form the integral appearance of the security inspection instrument;
the terahertz light emitted by the solid source (8) is divided into two beams through the double-end waveguide antenna (9), one beam is expanded through the first focusing lens (10) and directly irradiates the object to be detected, the other beam passes through the second focusing lens (11) and sequentially passes through the first reflecting mirror (12) and the second reflecting mirror (13), the terahertz light is emitted from the right left side of the lens barrel (14) and irradiates the object to be detected, the lower solid source is the same, the terahertz light is emitted from the lower side and the right side of the lens barrel (14) and irradiates the object to be detected, the whole system is provided with four light sources and irradiates the object to be detected at the same time, so that the irradiation of multiple light sources at multiple angles is realized, the imaging output energy is increased, the diffuse reflection light of all or part of imaging areas is returned to the terahertz camera behind the lens barrel to image the object to be detected no matter what angle the surface of the object to be detected, the terahertz object to be detected can be detected by covering the terahertz object to be detected, and the detection module of the terahertz object to be detected can obtain the full-length of the terahertz radiation signal of the object to be detected by adopting the largest imaging area with the minimum side length of the imaging area or the imaging area;
the lens cone (14) is composed of a third lens (15), a fourth lens (16), a fifth lens (17) and a lens cone shell, the focal lengths of the third lens (15), the fourth lens (16) and the fifth lens (17) are different, the distance between the lenses is adjusted through screw thread rotation of the shell between the lenses, so that the purpose of adjusting the imaging effect is achieved, and a terahertz camera (18) is fixed at the tail end of the lens cone;
the detection door (5) is positioned at the entrance of the security inspection instrument and plays roles in primarily judging the positions of metal articles, counting the number of people and triggering the terahertz imaging system to start the image acquisition function;
the detecting door (5) can also preliminarily judge the shape and the size of the metal object carried by the detected person.
2. The channel terahertz active imaging human body security inspection instrument according to claim 1, characterized in that the terahertz camera (18) is a 220GHz focal plane camera, and the sensitivity can reach the picowatt level.
3. The channel terahertz active imaging human body security inspection instrument according to claim 1, wherein the terahertz imaging optical path system is divided into two independent systems which are respectively installed in two security inspection instrument frames, the two systems are placed in a face-to-face staggered mode so as to prevent light source energy of one system from entering the other system, and the detection result is influenced, and each system comprises two 200GHz solid frequency doubling sources, one terahertz camera, four focusing lenses, four plane reflecting mirrors, one receiving lens barrel and a bracket for fixing all devices.
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