CN113687436B - Double-view push-broom terahertz human body imaging equipment - Google Patents
Double-view push-broom terahertz human body imaging equipment Download PDFInfo
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- CN113687436B CN113687436B CN202110743884.XA CN202110743884A CN113687436B CN 113687436 B CN113687436 B CN 113687436B CN 202110743884 A CN202110743884 A CN 202110743884A CN 113687436 B CN113687436 B CN 113687436B
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- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
Abstract
The invention discloses a double-view push-broom terahertz human body imaging device, which belongs to the technical field of passive human body imaging and comprises a first-view human body imaging acquisition module, a second-view 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 human body detection imaging with double visual angles in one scanning by one device, reduces detection blind areas, improves detection rate and reduces equipment cost; compared with the common swing and rotation scanning modes, the push-broom type scanning mode is limited by the space imaging distance, the required detection space is smaller in volume, the occupied space is smaller when the equipment is used as a whole, the push-broom type scanning mode is more suitable for various places, and the application is flexible; a plurality of multichannel radiometers with switch matrixes are adopted, acquisition control of terahertz signals is realized through switching channels, the integration level is improved, and the hardware cost of the radiometers is reduced.
Description
Technical Field
The invention relates to the technical field of passive human body imaging, in particular to a double-view push-broom terahertz human body imaging device.
Background
The human body security inspection devices which are common in China at present are a handheld metal detector, a metal security inspection door, a weak photon human body detection device, an active millimeter wave human body imaging device and a passive terahertz human body imaging device.
The handheld metal detector and the metal security inspection door are often used in a combined mode, but the handheld metal detector and the metal security inspection door have certain limitations in use, metal substances can be detected only, detection capability on various nonmetallic dangerous substances is not achieved, the handheld metal detector needs manual whole-body detection by an operator, the passing time of a detected person is long, and the experience of the detected person is poor. The weak photon human body detection device is based on an X-ray imaging device, and although substances such as metal, nonmetal, powder, liquid and the like carried by a human body can be detected, the X-ray has very short wavelength and very strong energy, and the ionizing radiation caused by the weak photon human body detection device causes damage to the human body to be detected to a certain extent and cannot be used for a long time. The active millimeter wave human imaging device has high spatial resolution and strong penetrating power, can effectively detect various articles carried by human bodies, is mainly applied to places such as airports, customs and the like at present, but has the basic principle that electromagnetic waves with certain power are actively radiated outwards, cannot be widely accepted by the masses, and has higher device price. Compared with the passive terahertz human body imaging equipment, the passive terahertz human body imaging equipment has the advantages of no radiation, low cost, easy popularization on the use level and wide application in large passenger flow places such as subways and inspection stations at present.
The common passive terahertz human body imaging devices are mainly channel type, rotary type and wall-hanging/standing type in terms of use form. The channel type terahertz human imaging device is characterized in that 2 pieces of equipment are integrated in a specific equipment cabin, when a human body passes through the specific channel, detection of two front and rear side visual angles of the human body can be achieved, but the system is high in overall price, rotary type and wall-mounted/standing type equipment are generally adopted, the detection of multiple visual angles can be achieved through rotary matching of personnel, user experience is poor, the detection of one visual angle of the human body can only be achieved through the latter, on the other hand, the scanning coverage space required by the scanning mode which is still used by the traditional passive terahertz human imaging device is large, the occupied area of the whole detection area is large when the device is used is only suitable for places with wide space and is easily influenced by clutters of surrounding environments, the device cannot be used in various places flexibly, and large-scale popularization is not facilitated. Based on the problems, a double-view push-broom terahertz human body imaging device is provided.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to solve the problems of inconvenient detection, large occupied space of equipment and the like of the traditional passive terahertz human body imaging equipment, and provides the double-view push-broom terahertz human body imaging equipment. The device adopts a push-broom type scanning scheme, the space volume of a required detection area is smaller, the device has no extra occupied area except the self volume of the device, and meanwhile, the device can perform scanning imaging of double visual angles of a human body, and 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 of various occasions; meanwhile, the equipment adopts the multichannel radiometer with the 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 through the following technical scheme that the device 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 respectively 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 connection device, a first side visual angle imaging acquisition module, a second side visual angle imaging acquisition module and a side bracket, wherein the first side visual angle imaging acquisition module and the second side visual angle imaging acquisition module are connected with the scanning connection device and are respectively arranged at two sides of the scanning connection device, the scanning connection device is arranged on the side bracket, and the scanning connection 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, wherein 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 support, and the first driving device, the second driving device and the upper computer are all electrically connected with the power supply device;
the first side view angle imaging acquisition modules and the second side view angle imaging acquisition modules on two sides are all in communication connection with the upper computer;
the side brackets on both sides are connected with the bottom plate device.
Furthermore, the first side view angle imaging acquisition module and the second side view angle imaging acquisition module have the same structure and comprise a switch type multichannel radiometer array, a quasi-light path structure and a signal processing device, terahertz signals radiated by a human body are focused on the switch type multichannel radiometer array through the quasi-light path structure, and then are analyzed and processed by the signal processing device and then are transmitted to the upper computer.
Further, the quasi-optical 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 type lens group.
Furthermore, the switch type multi-channel radiometer array comprises a plurality of multi-channel radiometers with switch matrixes, so that the signal acquisition is realized by switching different multiplexing channels of the radiometers, and the channel number is more than or equal to 2. The multichannel radiometer is in linear single-row or multi-row staggered arrangement.
Still further, the multichannel radiometer includes receiving antenna array, signal matching converter, broadband switch multiplexing matrix, broadband power detector and integrating circuit, receiving antenna array, signal matching converter, broadband switch multiplexing matrix, broadband power detector and integrating circuit connect gradually.
Still further, the first side view angle imaging acquisition module and the second side view angle imaging acquisition module in the first view angle human body imaging acquisition module and the second view angle human body imaging acquisition module are respectively located on the same vertical plane, wherein the movement directions of the first side view angle imaging acquisition module and the second side view angle imaging acquisition module on the same side are opposite. The first side view angle imaging acquisition modules and the second side view angle imaging acquisition modules on 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 or simultaneously.
Further, the scanning connecting device is of a transmission structure and is any one of a synchronous belt, a steel wire rope or a chain transmission structure.
Still further, the transmission structure is synchronous belt transmission structure, including a hold-in range, two synchronous pulleys, synchronous pulleys sets up respectively the upper and lower both ends of side stand, two synchronous pulleys respectively with the hold-in range is connected, first side view angle formation of image collection module second side view angle formation of image collection module installs respectively the both sides of hold-in range.
Still further, the first visual angle human body imaging acquisition module and the second visual angle human body imaging acquisition module each 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.
Still further, the position measurement device is a magnetic grating ruler assembly, and comprises a magnetic grating ruler and a magnetic grating ruler reading module, wherein the magnetic grating ruler is arranged on the side support, and the magnetic grating 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 base plate means may integrate metal detection means.
Compared with the prior art, the invention has the following advantages: the double-view push-broom terahertz human body imaging device adopts two sets of acquisition scanning devices, can realize human body detection imaging of double views in one scanning by one device, reduces detection blind areas, improves detection rate and reduces equipment cost; compared with the common swing and rotation scanning modes, the push-broom type scanning mode is limited by the space imaging distance, the required detection space is smaller in volume, the occupied space is smaller when the equipment is used as a whole, the push-broom type scanning mode is more suitable for various places, and the application is flexible; a plurality of multichannel radiometers with switch matrixes are adopted, acquisition control of terahertz signals is realized through switching channels, the integration level is improved, and the hardware cost of the radiometers is reduced.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a dual view push-broom terahertz human imaging device according to an embodiment of the present invention;
FIG. 2 is a front view of a dual view push broom terahertz human imaging device in accordance with an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a first view human imaging acquisition module according to an embodiment of the present invention;
FIG. 4a is a schematic top view of a first left and right view imaging acquisition module according to an embodiment of the present invention;
FIG. 4b is a schematic structural diagram of a first left view imaging acquisition module according to an embodiment of the present invention;
FIG. 5 is a schematic view of a portion of a first scan connection device and a first position measurement device according to an embodiment of the present invention;
FIG. 6a is a schematic diagram of the internal composition of a switching radiometer in an embodiment of the invention;
FIG. 6b is a schematic diagram of a channel switch acquisition of a switched radiometer array during a scan in an embodiment of the invention;
fig. 7 is a schematic diagram of a first/second view human imaging acquisition module according to an embodiment of the present invention.
Detailed Description
The following describes in detail the examples of the present invention, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of protection of the present invention is not limited to the following examples.
As shown in fig. 1, the overall structure of the dual-view push-broom terahertz human body imaging apparatus of the present embodiment is schematically shown, and 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 'mouth' -shaped structure, 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 scan the front side and the rear side of the detected person respectively 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 type profile information of the detected person and the carried object profile 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 identical in design. Taking the first-view human imaging acquisition module 1 as an example for specific explanation, as shown in fig. 3, the interior of the first-view human imaging acquisition module includes a first scanning connection device 10, a first left-view imaging acquisition module 11, a first right-view imaging acquisition module 12, a first position measurement device 13 and a first bracket 14.
Correspondingly, the second visual angle human body imaging and collecting module 2 comprises a second scanning connecting device 20, a second left visual angle imaging and collecting module 21, a second right visual angle imaging and collecting module 22, a second position measuring device and a second bracket 24, wherein the setting positions of the components are in mirror symmetry with those in the first visual angle human body imaging and collecting module 1.
In this embodiment, the first left view imaging and acquiring module 11 and the first right view imaging and acquiring module 12 are designed to be the same, when a human body stands at the central position of the bottom plate device 4, the first left view imaging and acquiring module 11 acquires terahertz signals on the left side of the front side of the human body, the first right view imaging and acquiring module 12 acquires terahertz signals on the right side of the front side of the human body, as shown in fig. 4a, the signals acquired by the modules are uploaded to the signal processing device, and finally, the upper computer 32 realizes the image stitching. Taking the first left view imaging acquisition module 11 as an example, as shown in fig. 4b, it includes a first left view switch-type multichannel radiometer array 110, a first left view quasi-optical light path structure 111, and a first left view signal processing device 112. In a specific embodiment, the first left view quasi-optical light path structure 111 is designed by adopting a reflecting mirror group, and is composed of a plane reflecting mirror and a concave reflecting mirror, wherein the reflecting mirror group is made of metal materials or composite materials with metal coated surfaces, each component is in a static state relative to the first left view imaging acquisition module 11, terahertz signals radiated by a human body are reflected by the plane mirror and the concave reflecting mirror and finally focused on the terahertz radiometer array 110, and the radiometers are limited by the self volume, so that the double-row linear staggered array arrangement is adopted in the specific embodiment.
In this embodiment, the first scanning connection device 10 includes a synchronous belt 101, 2 synchronous pulleys 102,2, and two synchronous pulleys 102 respectively fixed at the upper and lower ends of the central position of the first support 14 by fasteners, the synchronous belt 101 spans the 2 synchronous pulleys 102 to realize gear engagement, the first left and right view imaging acquisition modules 11, 12 are located at two sides of the synchronous belt 101, as shown in fig. 5, the first left and right view imaging acquisition modules 11, 12 are driven by the synchronous belt 101 to perform up and down rectilinear reciprocating motion along the first support 14 and have opposite motion directions.
It should be noted that, the second view angle human body imaging and collecting module 1 has the same structure as the first view angle human body imaging and collecting module 2, the second left view angle imaging and collecting module 21 has the same or opposite scanning movement direction as the first left view angle imaging and collecting module 11, and the second right view angle imaging and collecting module 22 has the same or opposite scanning movement direction as the first right view angle imaging and collecting module 11.
When needed, the second visual angle human body imaging acquisition module 2 and the first visual angle human body imaging acquisition module 1 are independently driven, and can work simultaneously or independently.
The first left and right view angle switch type multichannel radiometer arrays 110 are all provided with a plurality of switch type multichannel radiometers, the number of channels is more than or equal to 2, and the inside of the first left and right view angle switch type multichannel radiometer arrays 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 embodiment, a four-channel radiometer with a switch matrix is adopted, as shown in fig. 6a, which includes a receiving antenna array 1101, a signal matching converter 1102, a broadband low noise amplifier 1103, a broadband switch multiplexing matrix 1104, a broadband low noise amplifier 1105, a broadband power detector 1106, and an integrating circuit 1107, when scanning, different channels are rapidly selected for collection by controlling sequential switching of four channels of the switch radiometer, so that the integration level of the radiometer is further improved, the cost is reduced, the collection point schematic diagram of the switch radiometer array is shown in fig. 6b, one channel is sequentially selected for each switching, when the 1 st channel is opened, the 2 nd, 3 rd and 4 th channels are closed, then the 1 st, 3 nd and 4 th channels are closed, and the 2 nd channels are opened and sequentially circulated.
Specifically, the top board apparatus 3 includes a first driving apparatus 30, a second driving apparatus 31, an upper computer 32, and a power supply apparatus 33; as shown in fig. 1, the first driving device 30 and the second driving device 31 have the same structure and are mutually independent, and comprise a motor, a speed reducer and a coupling device, which are respectively installed at two sides of the top plate device 3, the first driving device 30 drives the first left and right visual angle imaging acquisition modules 11 and 12 to perform up-and-down linear back-and-forth movement by connecting with the first scanning connection device 10, the first position measuring device 13 (corresponding second driving device 31 is connected with the second scanning connection device 20) records the position information of the movement of the first left and right visual angle imaging acquisition modules 11 and 12 in real time, compares the position information with a set path value, decelerates when approaching the top/bottom end of the first scanning connection device 10, and the detection devices such as an electric switch and a micro switch are installed at the top/bottom end of the central bracket of the first bracket 14, and reset is performed by judging whether the detection devices trigger to ensure the starting position of scanning and adjusting the positions of the first left and right visual angle imaging acquisition modules 11 and 12.
Specifically, the upper computer 32 controls the first and second driving devices 30 and 31 to drive the first view human imaging acquisition module 1 and the second view human imaging acquisition module 2 to start scanning, taking the first view human imaging acquisition module 1 as an example for specific explanation, the motor of the first driving device 30 starts accelerating to drive the first left and right view imaging acquisition modules 11 and 12 to start moving and reach a set rotating speed, at this time, the plurality of radiometers with switch matrixes synchronously start to rapidly and sequentially switch channels to realize the acquisition of terahertz signals, and sequentially and reciprocally circulate, in the whole scanning process, the first position measuring device 13 reads and feeds back the movement position information of the first right view acquisition module 12 in real time, the motor starts to slow down to stop after the scanning distance approaches to a set value, in the whole scanning process, the switch radiometers always switch channels and acquire, after the movement stops, all channels of the plurality of radiometers with switch matrixes are closed until the next scanning starts, the acquired terahertz signals are processed by the signal processing device and then uploaded to the upper computer 32, the upper computer 32 realizes the detection image splicing of the left and right sides of the human body, as shown in the whole imaging module 7, and the second view is the same as the whole imaging module 2.
In this embodiment, when the first left and right view imaging acquisition modules 11, 12 are scanned up and down, the first position measuring device 13 acquires moving position information of the first left and right view imaging acquisition modules 11, 12, the position measuring device may 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 adopts a magnetic grating ruler to measure the position information, the magnetic grating ruler reading device is fixed at the top end of the first right view imaging acquisition module 12, the magnetic grating ruler is fixed on the central support of the first support 14, as shown in fig. 5, the magnetic grating ruler reading device slides on the magnetic grating ruler along with the movement of the first right view imaging acquisition module 12 to obtain the position information, the distance between the first left view imaging acquisition module 11 and the first right view imaging acquisition module 12 is fixed, and the position information of the first left view imaging acquisition module 11 is obtained through calculation.
In this embodiment, the first view-angle human body imaging acquisition module 1 and the second view-angle human body imaging acquisition module 2 are installed relatively, the material of the packaging shell adopted by the two opposite surfaces is capable of transmitting terahertz waves, the terahertz waves comprise foaming materials and composite materials, in this embodiment, the foaming materials and the composite materials are combined, the bottom plate device 4 is integrated with a metal detection device, metal detection on the sole is achieved, the top shell of the metal detection device area is made of a non-metal material, such as a wood plate, and the shells at other positions of the device can be made of metal or composite materials.
In summary, the dual-view push-broom terahertz human body imaging device in the embodiment adopts two sets of acquisition scanning devices, so that human body detection imaging with dual view can be realized in one scan by one device, detection dead zones are reduced, detection rate is improved, and equipment cost is reduced; compared with the common swing and rotation scanning modes, the push-broom type scanning mode is limited by the space imaging distance, the required detection space is smaller in volume, the occupied space is smaller when the equipment is used as a whole, the push-broom type scanning mode is more suitable for various places, and the application is flexible; a plurality of multichannel radiometers with switch matrixes are adopted, acquisition control of terahertz signals is realized through switching channels, the integration level is improved, the hardware cost of the radiometers is reduced, and the multichannel radiometers are worthy of being popularized and used.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (6)
1. A double-view push-broom terahertz human body imaging device is characterized in that: the device 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 respectively 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 connection device, a first side visual angle imaging acquisition module, a second side visual angle imaging acquisition module and a side bracket, wherein the first side visual angle imaging acquisition module and the second side visual angle imaging acquisition module are connected with the scanning connection device and are respectively arranged at two sides of the scanning connection device, the scanning connection device is arranged on the side bracket, and the scanning connection 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, wherein 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 support, and the first driving device, the second driving device and the upper computer are all electrically connected with the power supply device;
the first side view angle imaging acquisition modules and the second side view angle imaging acquisition modules on two sides are all in communication connection with the upper computer;
the side brackets on two sides are connected with the bottom plate device;
the first side view angle imaging acquisition module and the second side view angle imaging acquisition module have the same structure and comprise a switch type multichannel radiometer array, a quasi-light optical path structure and a signal processing device, terahertz signals radiated by a human body are focused on the switch type multichannel radiometer array through the quasi-light optical path structure, and then are analyzed and processed by the signal processing device and then are transmitted to the upper computer;
the switch type multichannel radiometer array comprises a plurality of multichannel 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;
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;
the first side view angle imaging acquisition module and the second side view angle imaging acquisition module in the first view angle human body imaging acquisition module and the second side view angle imaging acquisition module are respectively located on the same vertical plane, and the movement directions of the first side view angle imaging acquisition module and the second side view angle imaging acquisition module on the same side are opposite.
2. The dual view push broom terahertz human imaging apparatus of claim 1, wherein: the quasi-light optical path structure is a static lens group structure and is any one of a transmission type lens group, a reflection type lens group or a transmission type lens group.
3. The dual view push broom terahertz human imaging apparatus of claim 2, wherein: the scanning connecting device is of a transmission structure and is any one of a synchronous belt, a steel wire rope or a chain transmission structure.
4. A dual view push broom terahertz human imaging device in accordance with claim 3, wherein: the transmission structure is a synchronous belt transmission structure and comprises a synchronous belt and two synchronous pulleys, wherein the two synchronous pulleys are respectively arranged at the upper end and the lower end of the side support, the two synchronous pulleys are respectively connected with the synchronous belt, and the first side view angle imaging acquisition module and the second side view angle imaging acquisition module are respectively arranged at two sides of the synchronous belt.
5. The dual view push broom terahertz human imaging apparatus of claim 4, wherein: the first visual angle human body imaging acquisition module and the second visual angle human body imaging acquisition module also comprise position measurement devices, and the position measurement devices are any one of magnetic grating ruler, grating ruler or angle decoder components.
6. The dual view push broom terahertz human imaging apparatus of claim 5, wherein: the position measuring device is a magnetic grating ruler assembly and comprises a magnetic grating ruler and a magnetic grating ruler reading module, wherein the magnetic grating ruler is arranged on the side support, and the magnetic grating 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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