CN113687436A - Double-view-angle push-sweeping type terahertz human body imaging equipment - Google Patents
Double-view-angle push-sweeping type terahertz human body imaging equipment Download PDFInfo
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Abstract
The invention discloses double-view push-broom type terahertz human body imaging equipment, belongs to the technical field of passive human body imaging, and comprises a first view angle human body imaging acquisition module, a second view angle human body imaging acquisition module, a top plate device and a bottom plate device. The invention adopts two sets of acquisition scanning devices, can realize double-view human body detection imaging in one scanning process by using one device, reduces detection blind areas, improves the detection rate and reduces the device cost; compared with the common swinging and rotating scanning modes, the push-broom type scanning scheme is adopted, the limit of the space imaging distance is small, the required detection space volume is smaller, the occupied space is smaller when the whole equipment is used, the push-broom type scanning device is more suitable for various places, and the application is flexible; a plurality of multi-channel radiometers with switch matrixes are adopted, the acquisition control of terahertz signals is realized by switching channels, the integration level is improved, and the hardware cost of the radiometer is reduced.
Description
Technical Field
The invention relates to the technical field of passive human body imaging, in particular to double-view-angle push-broom terahertz human body imaging equipment.
Background
Currently, the common human body security check devices in China are handheld metal detectors, metal security check gates, weak photon human body detection devices, active millimeter wave human body imaging devices and passive terahertz human body imaging devices.
These two kinds of equipment of hand-held type metal detector and metal security inspection door often jointly use, but these two kinds of equipment have certain limitation in the use, all can only detect metal class material, do not have the detection capability to various non-metal hazardous articles, and hand-held type metal detector needs the operator to carry out artificial whole-body detection, and examinee's transit time is longer, and the experience of examining the people is felt relatively poor. The weak-photon human body detection equipment is based on an X-ray imaging device in nature, although metal, nonmetal, powder, liquid and other substances carried by a human body can be detected, the X-ray has short wavelength and strong energy, and the ionizing radiation caused by the X-ray causes a certain degree of damage to the human body to be detected, so that the weak-photon human body detection equipment cannot be used for a long time. The active millimeter wave human body imaging equipment has high spatial resolution and strong penetrating power, can effectively detect various articles carried by a human body, is mainly applied to places such as airports, customs and the like at present, but cannot be widely accepted by the public because the basic principle is that electromagnetic waves with certain power are actively radiated outwards, and the equipment price is higher. Compared with the prior art, the passive terahertz human body imaging equipment has the advantages of no radiation, low cost, easy popularization in the use level and wide application in large passenger flow fields such as subways, inspection stations and the like.
The common passive terahertz human body imaging devices are mainly channel type, rotary type and wall-mounted/standing type in terms of use form. The channel type generally adopts 2 devices to be integrated in a specific device cabin, the detection of the human body is completed when the human body passes through a specific channel, can meet the detection of two front and back side visual angles of a human body, but the whole system is expensive, 1 device is generally adopted for detection in a rotary type and a wall hanging/standing type, the former needs personnel to be matched in a rotary manner to finish the detection of a plurality of visual angles, the user experience is poor, the latter can only detect one visual angle of the human body, on the other hand, the passive terahertz human body imaging equipment still adopts a mechanical rotation or swing scanning mode, the required scanning coverage space is large, so that the occupied area of the whole detection area is large when the equipment is used, the device can only be suitable for places with wider space, and the device is easily influenced by clutter of the surrounding environment, can not be flexibly used in various places, and is not beneficial to large-scale popularization. Based on the problems, the double-view push-broom type terahertz human body imaging device is provided.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to solve the detection that current passive form terahertz human imaging equipment exists inconvenient, equipment occupation of land space big scheduling problem, provide a double-view push-broom formula terahertz human imaging equipment. The device adopts a push-broom type scanning scheme, the required detection area space volume is smaller, no extra occupied area is used except the volume of the device, and the device can simultaneously carry out scanning imaging of two visual angles of a human body, is used for solving the problems of large occupied area, single detection visual angle and the like in the existing passive terahertz human body imaging device, has high flexibility, and can meet the use requirements of various occasions; meanwhile, the equipment adopts a multi-channel radiometer with a switch matrix to collect signals, so that the integration level is improved, the hardware cost is reduced, and the popularization is easier.
The invention solves the technical problems by the following technical scheme, and the invention comprises a first visual angle human body imaging acquisition module, a second visual angle human body imaging acquisition module, a top plate device and a bottom plate device, wherein the top plate device and the bottom plate device are both arranged between the first visual angle human body imaging acquisition module and the second visual angle human body imaging acquisition module, and the first visual angle human body imaging acquisition module and the second visual angle human body imaging acquisition module are symmetrically arranged;
the first visual angle human body imaging acquisition module and the second visual angle human body imaging acquisition module have the same structure and respectively comprise a scanning connecting device, a first side visual angle imaging acquisition module, a second side visual angle imaging acquisition module and a side bracket, the first side visual angle imaging acquisition module and the second side visual angle imaging acquisition module are respectively connected with the scanning connecting device and are respectively arranged at two sides of the scanning connecting device, the scanning connecting device is arranged on the side bracket, and the scanning connecting device is connected with the top plate device;
the top plate device comprises a first driving device, a second driving device, an upper computer, a power supply device and a top frame, the first driving device is connected with a scanning connecting device in the first visual angle human body imaging acquisition module, the second driving device is connected with a scanning connecting device in the second visual angle human body imaging acquisition module, the first driving device, the second driving device, the upper computer and the power supply device are all arranged on the top frame, the top frame is connected with the side frame, and the first driving device, the second driving device and the upper computer are all electrically connected with the power supply device;
the first lateral visual angle imaging acquisition module and the second lateral visual angle imaging acquisition module on two sides are in communication connection with the upper computer;
the side brackets on the two sides are connected with the bottom plate device.
Furthermore, the first lateral visual angle imaging acquisition module and the second lateral visual angle imaging acquisition module are identical in structure and respectively comprise a switch type multi-channel radiometer array, a quasi-optical path structure and a signal processing device, terahertz signals radiated by a human body are focused on the switch type multi-channel radiometer array through the quasi-optical path structure, and then are analyzed and processed by the signal processing device and then transmitted to the upper computer.
Furthermore, the quasi-optical light path structure is a static lens structure, and is any one of a transmission type, a reflection type or a transmission-reflection type lens.
Furthermore, the switch type multi-channel radiometer array comprises a plurality of multi-channel radiometers with switch matrixes, the switching of different multiplexing channels of the radiometers is realized to collect signals, and the number of the channels is more than or equal to 2. The multi-channel radiometer is in a linear single-row or multi-row staggered arrangement.
Furthermore, the multichannel radiometer comprises a receiving antenna array, a signal matching converter, a broadband switch multiplexing matrix, a broadband power detector and an integrating circuit, wherein the receiving antenna array, the signal matching converter, the broadband switch multiplexing matrix, the broadband power detector and the integrating circuit are sequentially connected.
Furthermore, the first visual angle human body imaging acquisition module, in the second visual angle human body imaging acquisition module, the first lateral visual angle imaging acquisition module and the second lateral visual angle imaging acquisition module are respectively positioned on the same vertical plane, wherein the first lateral visual angle imaging acquisition module and the second lateral visual angle imaging acquisition module on the same side are opposite in movement direction. The first lateral visual angle imaging acquisition module and the second lateral visual angle imaging acquisition module at the same side work simultaneously. The first visual angle human body imaging acquisition module and the second visual angle human body imaging acquisition module can work independently and simultaneously.
Furthermore, the scanning connection device is a transmission structure, and is any one of a synchronous belt, a steel wire rope or a chain transmission structure.
Further, the transmission structure is a synchronous belt transmission structure and comprises a synchronous belt and two synchronous belt wheels, the synchronous belt wheels are arranged at the upper end and the lower end of the side support respectively, the two synchronous belt wheels are connected with the synchronous belt respectively, and the first side visual angle imaging acquisition module and the second side visual angle imaging acquisition module are arranged on two sides of the synchronous belt respectively.
Furthermore, the first view angle human body imaging acquisition module and the second view angle human body imaging acquisition module both further comprise a position measurement device, and the position measurement device is any one of a magnetic grating ruler, a grating ruler or an angle decoder assembly.
Furthermore, the position measuring device is a magnetic grid ruler assembly and comprises a magnetic grid ruler and a magnetic grid ruler reading module, the magnetic grid ruler is arranged on the side support, and the magnetic grid ruler reading module is arranged on the first side visual angle imaging acquisition module/the second side visual angle imaging acquisition module.
Still further, the backplane device may integrate a metal detection device.
Compared with the prior art, the invention has the following advantages: the double-view-angle push-scanning terahertz human body imaging equipment adopts two sets of collecting and scanning devices, can realize double-view-angle human body detection imaging in one-time scanning by using one piece of equipment, reduces detection blind areas, improves the detection rate and reduces the equipment cost; compared with the common swinging and rotating scanning modes, the push-broom type scanning scheme is adopted, the limit of the space imaging distance is small, the required detection space volume is smaller, the occupied space is smaller when the whole equipment is used, the push-broom type scanning device is more suitable for various places, and the application is flexible; a plurality of multi-channel radiometers with switch matrixes are adopted, the acquisition control of terahertz signals is realized by switching channels, the integration level is improved, and the hardware cost of the radiometer is reduced.
Drawings
Fig. 1 is a schematic overall structure diagram of a double-view push-broom terahertz human body imaging device in an embodiment of the invention;
FIG. 2 is a front view of a double-view push-broom terahertz human body imaging device in an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a first-view human body imaging acquisition module according to an embodiment of the present invention;
FIG. 4a is a schematic top view of a first left and right viewing angle imaging acquisition module in use according to an embodiment of the present invention;
FIG. 4b is a schematic structural diagram of a first left-view imaging acquisition module in an embodiment of the present invention;
FIG. 5 is a partial schematic view of a first scanning interface and a first position measuring device in accordance with an embodiment of the present invention;
FIG. 6a is a schematic diagram of the internal components of a switch-mode radiometer in an embodiment of the present invention;
FIG. 6b is a schematic diagram of channel switch acquisition of a switched radiometer array during a scan according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a first/second viewing angle human body imaging acquisition module in an embodiment of the invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
As shown in fig. 1, which is a schematic view of an overall structure of the dual-view push-broom terahertz human body imaging apparatus in this embodiment, the apparatus includes a first view human body imaging and collecting module 1, a second view human body imaging and collecting module 2, a top plate device 3, and a bottom plate device 4. The first visual angle human body imaging acquisition module 1 and the second visual angle human body imaging acquisition module 2 are connected through the top plate device 3 and the bottom plate device 4 to form a structure shaped like a Chinese character 'kou', as shown in fig. 2. When a human body stands at the central position of the bottom plate device 4, the first visual angle human body imaging acquisition module 1 and the second visual angle human body imaging acquisition module 2 respectively scan the front side and the rear side of the detected person from top to bottom/from bottom to top, the acquired human body terahertz signals are subjected to data processing and image reconstruction through the signal processing device and the upper computer 32, and finally the body shape outline information of the detected person and the carried object outline information are displayed on the display.
In this embodiment, the first-view human body imaging acquisition module 1 and the second-view human body imaging acquisition module 2 are designed in the same way. Taking the first-view human body imaging and collecting module 1 as an example for specific explanation, as shown in fig. 3, the interior thereof includes a first scanning connection device 10, a first left-view imaging and collecting module 11, a first right-view imaging and collecting module 12, a first position measuring device 13, and a first bracket 14.
Correspondingly, the second-view human body imaging acquisition module 2 comprises a second scanning connection device 20, a second left-view imaging acquisition module 21, a second right-view imaging acquisition module 22, a second position measurement device and a second support 24, and the arrangement positions of the above components are mirror-symmetrical to the mirror image in the first-view human body imaging acquisition module 1.
In this embodiment, the first left visual angle imaging and collecting module 11 and the first right visual angle imaging and collecting module 12 are designed the same, when a human body stands at the central position of the bottom plate device 4, the first left visual angle imaging and collecting module 11 collects terahertz signals on the left side of the front side of the human body, the first right visual angle imaging and collecting module 12 collects terahertz signals on the right side of the front side of the human body, as shown in fig. 4a, the signals collected by the modules are uploaded to the signal processing device, and finally, the images are spliced on the upper computer 32. Taking the first left view imaging and collecting module 11 as an example for specific description, as shown in fig. 4b, it includes a first left view switch type multi-channel radiometer array 110, a first left view quasi-optical path structure 111, and a first left view signal processing device 112. In an embodiment, the first left-view quasi-optical path structure 111 adopts a mirror group design, and is composed of a planar mirror and a concave mirror, the mirror group is made of a metal material or a composite material with a metal coated surface, each component is in a static state relative to the first left-view imaging and collecting module 11, terahertz signals radiated by a human body are reflected by the planar mirror and the concave mirror and finally focused on the terahertz radiometer array 110, and the radiometer is limited by the volume of the radiometer.
In this embodiment, the first scanning connecting device 10 includes a synchronous belt 101, 2 synchronous belt pulleys 102 are respectively fixed at the upper and lower ends of the central position of the first bracket 14 through fasteners, the synchronous belt 101 crosses over 2 synchronous belt pulleys 102 to realize gear engagement, the first left and right viewing angle imaging and collecting modules 11 and 12 are located at two sides of the synchronous belt 101, the partial schematic view is shown in fig. 5, the first left and right viewing angle imaging and collecting modules 11 and 12 are driven by the synchronous belt 101 to perform up and down linear reciprocating motion along the first bracket 14, and the motion directions are opposite.
It should be noted that the second-view human body imaging and collecting module 1 and the first-view human body imaging and collecting module 2 have the same structure, the second left-view imaging and collecting module 21 and the first left-view imaging and collecting module 11 have the same or opposite scanning movement directions, and the second right-view imaging and collecting module 22 and the first right-view imaging and collecting module 11 have the same or opposite scanning movement directions.
When needed, the second visual angle human body imaging acquisition module 2 and the first visual angle human body imaging acquisition module 1 are driven independently, and can work simultaneously or independently.
The first left and right view angle switch type multi-channel radiometer array 110 adopts a plurality of switch type multi-channel radiometers, the number of channels is more than or equal to 2, and the interior of the array mainly comprises a receiving antenna array, a signal matching converter, a broadband switch multiplexing matrix, a broadband power detector and an integrating circuit. In this specific embodiment, a four-channel radiometer with a switch matrix is used, as shown in fig. 6a, the four-channel radiometer includes a receiving antenna array 1101, a signal matching converter 1102, a wideband low noise amplifier 1103, a wideband switch multiplexing matrix 1104, a wideband low noise amplifier 1105, a wideband power detector 1106, and an integrating circuit 1107, during scanning, different channels are quickly selected for acquisition by controlling sequential switching of four channels of the switch type radiometer, so that the integration of the radiometer is further improved, and the cost is reduced.
Specifically, the top plate device 3 includes a first driving device 30, a second driving device 31, an upper computer 32, and a power supply device 33; as shown in FIG. 1, the first driving device 30 and the second driving device 31 have the same structure and are independent from each other, and include a motor, a speed reducer, and a coupling device, which are respectively installed on both sides of the top plate device 3, the first driving device 30 drives the first left and right viewing angle imaging and collecting modules 11, 12 to perform a vertical linear reciprocating motion by connecting with the first scanning connection device 10, the first driving device 30 records the position information of the motion of the first left and right viewing angle imaging and collecting modules 11, 12 in real time by connecting with the first position measuring device 13 (the corresponding second driving device 31 is connected with the second scanning connection device 20), compares with the set distance value, and decelerates when approaching the top/bottom end of the first scanning connection device 10, installs a detecting device such as an electric switch, a microswitch, etc. on the top/bottom end of the central support of the first support 14, and determines whether to trigger the starting position of the scan and adjusts the first left, right, etc. based on the trigger of the detecting device, And resetting the positions of the right visual angle imaging acquisition modules 11 and 12.
Specifically, the upper computer 32 controls the first and second driving devices 30, 31 to drive the first viewing angle human body imaging and collecting module 1 and the second viewing angle human body imaging and collecting module 2 to start scanning, taking the first viewing angle human body imaging and collecting module 1 as an example for specific explanation, the motor of the first driving device 30 starts to accelerate to drive the first left and right viewing angle imaging and collecting modules 11, 12 to start moving and reach a set rotating speed, at this time, a plurality of radiometers with switch matrixes start to rapidly and sequentially switch channels to realize terahertz signal collection, and cycle is repeated in sequence, during the whole scanning process, the first position measuring device 13 reads and feeds back the moving position information of the first right viewing angle collecting module 12 in real time, when the scanning distance approaches the set value, the motor starts to decelerate to stop, during the whole scanning process, the switch type radiometer always switches and collects the channels, when the movement stops, all channels of a plurality of radiometers with switch matrixes are closed until the next scanning starts, the collected terahertz signals are processed by the signal processing device and then uploaded to the upper computer 32, the upper computer 32 realizes the splicing of the detection images on the left side and the right side of the front side of the human body, the whole principle schematic diagram is shown in fig. 7, and the second visual angle human body imaging acquisition modules 2 are the same.
In the present embodiment, when the first left and right view angle imaging acquisition modules 11 and 12 perform up-and-down scanning, the first position measuring device 13 collects the moving position information of the first left and right viewing angle imaging collection modules 11 and 12, the position measuring device can be a device capable of recording position information, such as a magnetic grating ruler, a grating ruler or an angle encoder, in this embodiment, the first position measuring device 13 measures position information using a magnetic scale, the reading device of the magnetic scale is fixed on the top of the first right viewing angle imaging and collecting module 12, the magnetic scale is fixed on the central support of the first support 14, as shown in fig. 5, the magnetic grid ruler reading device slides on the magnetic grid ruler along with the movement of the first right viewing angle imaging and collecting module 12 to obtain the position information, the distance between the first left viewing angle imaging and collecting module 11 and the first right viewing angle imaging and collecting module 12 is fixed, and the position information of the first left viewing angle imaging and collecting module 11 is obtained through calculation.
In this embodiment, the human imaging collection module of first visual angle 1 and the human imaging collection module of second visual angle 2 are installed relatively, and the terahertz wave is transmitted to the encapsulation shell material that two opposite faces adopted, including expanded material and combined material, in this embodiment, adopt expanded material + combined material, the integrated metal detection device of bottom plate device 4, the realization is surveyed the metal of sole, and the regional top shell of metal detection device adopts non-metallic material, like the plank, and all the other position shells of this equipment can adopt metal or combined material.
In summary, the double-view push-broom terahertz human body imaging device of the embodiment adopts two sets of collecting and scanning devices, so that double-view human body detection imaging can be realized in one scanning process by using one device, detection blind areas are reduced, the detection rate is improved, and the device cost is reduced; compared with the common swinging and rotating scanning modes, the push-broom type scanning scheme is adopted, the limit of the space imaging distance is small, the required detection space volume is smaller, the occupied space is smaller when the whole equipment is used, the push-broom type scanning device is more suitable for various places, and the application is flexible; a plurality of multi-channel radiometers with switch matrixes are adopted, the acquisition control of terahertz signals is realized by switching channels, the integration level is improved, the hardware cost of the radiometer is reduced, and the radiometer is worthy of being popularized and used.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The utility model provides a double-view pushes away formula terahertz and scans human imaging equipment which characterized in that: the human body imaging acquisition module with the first visual angle and the second visual angle are symmetrically arranged;
the first visual angle human body imaging acquisition module and the second visual angle human body imaging acquisition module have the same structure and respectively comprise a scanning connecting device, a first side visual angle imaging acquisition module, a second side visual angle imaging acquisition module and a side bracket, the first side visual angle imaging acquisition module and the second side visual angle imaging acquisition module are respectively connected with the scanning connecting device and are respectively arranged at two sides of the scanning connecting device, the scanning connecting device is arranged on the side bracket, and the scanning connecting device is connected with the top plate device;
the top plate device comprises a first driving device, a second driving device, an upper computer, a power supply device and a top frame, the first driving device is connected with a scanning connecting device in the first visual angle human body imaging acquisition module, the second driving device is connected with a scanning connecting device in the second visual angle human body imaging acquisition module, the first driving device, the second driving device, the upper computer and the power supply device are all arranged on the top frame, the top frame is connected with the side frame, and the first driving device, the second driving device and the upper computer are all electrically connected with the power supply device;
the first lateral visual angle imaging acquisition module and the second lateral visual angle imaging acquisition module on two sides are in communication connection with the upper computer;
the side brackets on the two sides are connected with the bottom plate device.
2. The double-view push-broom terahertz human body imaging device according to claim 1, wherein: the structure of the first lateral visual angle imaging acquisition module is the same as that of the second lateral visual angle imaging acquisition module, and the first lateral visual angle imaging acquisition module and the second lateral visual angle imaging acquisition module respectively comprise an on-off type multi-channel radiometer array, a quasi-optical path structure and a signal processing device, wherein terahertz signals radiated by a human body are focused on the on-off type multi-channel radiometer array through the quasi-optical path structure, and then are analyzed and processed by the signal processing device and then transmitted to the upper computer.
3. The double-view push-broom terahertz human body imaging device according to claim 2, wherein: the quasi-optical light path structure is a static lens group structure and is any one of a transmission type lens group, a reflection type lens group and a transmission-reflection type lens group.
4. The double-view push-broom terahertz human body imaging device according to claim 3, wherein: the switch type multi-channel radiometer array comprises a plurality of multi-channel radiometers with switch matrixes, signal acquisition is carried out through switching of different multiplexing channels of the radiometers, and the number of the channels is more than or equal to 2.
5. The double-view push-broom terahertz human body imaging device according to claim 4, wherein: the multichannel radiometer comprises a receiving antenna array, a signal matching converter, a broadband switch multiplexing matrix, a broadband power detector and an integrating circuit, wherein the receiving antenna array, the signal matching converter, the broadband switch multiplexing matrix, the broadband power detector and the integrating circuit are sequentially connected.
6. The double-view push-broom terahertz human body imaging device according to claim 5, wherein: the human imaging collection module of first visual angle in the human imaging collection module of second visual angle first side visual angle imaging collection module second side visual angle imaging collection module is equallyd divide and is located same perpendicular, wherein the first side visual angle imaging collection module of homonymy second side visual angle imaging collection module motion direction is opposite.
7. The double-view push-broom terahertz human body imaging device according to claim 6, wherein: the scanning connecting device is a transmission structure and is any one of a synchronous belt, a steel wire rope or a chain transmission structure.
8. The double-view push-broom terahertz human body imaging device according to claim 7, wherein: the transmission structure is a synchronous belt transmission structure and comprises a synchronous belt and two synchronous belt wheels, wherein the synchronous belt wheels are arranged at the upper end and the lower end of the side bracket respectively, the two synchronous belt wheels are connected with the synchronous belt respectively, and the first side visual angle imaging acquisition module and the second side visual angle imaging acquisition module are arranged at two sides of the synchronous belt respectively.
9. The double-view push-broom terahertz human body imaging device according to claim 8, wherein: the first visual angle human body imaging acquisition module and the second visual angle human body imaging acquisition module both comprise position measurement devices, and the position measurement devices are any one of magnetic grating rulers, grating rulers or angle decoder components.
10. The double-view push-broom terahertz human body imaging device according to claim 9, wherein: the position measuring device is a magnetic grid ruler assembly and comprises a magnetic grid ruler and a magnetic grid ruler reading module, wherein the magnetic grid ruler is arranged on the side support, and the magnetic grid ruler reading module is arranged on the first side visual angle imaging acquisition module/the second side visual angle imaging acquisition module.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116908933A (en) * | 2023-09-06 | 2023-10-20 | 山东宏科水电设备有限公司 | Security inspection dangerous goods detection device based on terahertz imaging |
| CN116908933B (en) * | 2023-09-06 | 2023-11-24 | 山东宏科水电设备有限公司 | Security inspection dangerous goods detection device based on terahertz imaging |
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| CN113687436B (en) | 2023-10-13 |
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