CN106918843A - A kind of video speed scanning system based on passive type terahertz imaging - Google Patents
A kind of video speed scanning system based on passive type terahertz imaging Download PDFInfo
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- CN106918843A CN106918843A CN201710048339.2A CN201710048339A CN106918843A CN 106918843 A CN106918843 A CN 106918843A CN 201710048339 A CN201710048339 A CN 201710048339A CN 106918843 A CN106918843 A CN 106918843A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
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- G—PHYSICS
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
Abstract
The invention discloses a kind of video speed scanning system based on passive type terahertz imaging, including the first wedge-shaped mirrors of collection scanned object, the second wedge-shaped mirrors and feed antenna, the wedge-shaped mirrors have flat bottom and wedge surface reflecting surface corresponding thereto；The system also includes di-lens, second wedge-shaped mirrors are vertically set on the reflection scanning optical information of first wedge-shaped mirrors of downside reception of the first wedge-shaped mirrors, the di-lens is vertically set between the first wedge-shaped mirrors and the second wedge-shaped mirrors, reflected light information for the wedge-shaped mirrors of optically focused first projects the second wedge-shaped mirrors, the light projection transmission direction of di-lens is perpendicular to the ground, and the feed antenna is used to receive the optical information of the second wedge-shaped mirrors reflection.Present invention improves terahertz wave band closely passive safety check imaging time shortcoming more long, the quick video speed scanning of high-resolution is realized by the way of the combination of di-lens, dual rotary wedge surface mirror and detector array；Control is simple, high precision, it is adaptable to closely Terahertz safety check imaging field.
Description
Technical field
The present invention relates to a kind of video speed scanning system based on passive type terahertz imaging.
Background technology
In the last few years, the security threat that domestic and international public place was subject to is continuously increased, and public safety problem receives much concern.Pass
The safe examination system of the optics of system, infrared, X-ray and metal detection can not detect some potential concealment article, especially one
A little non-metallic weapons etc., therefore for human body and with the safety check problem urgent need to resolve with article.With the quick hair of imaging technique
Exhibition, the detection performance of international safe examination system achieves breakthrough, and the system working frequency range mainly involves Terahertz in millimeter
In wavelength band.
Millimeter wave（MMW）With low-frequency Terahertz（THz）Ripple wavelength is more long, with stronger penetration capacity and diffraction energy
Power, and resolution ratio higher can be provided, human body clothing can be penetrated, detect metal/non-metal weapon, the liquid of concealment
The dangerous goods such as explosive, biology/chemical violated thing.Be broadly divided into MMW and THz ripple imaging systems active imaging system and
Passive imaging system, active imaging system needs radiation source, it is general with dynamic detecting range higher and can realize 3D into
Picture, but radiation source is to human body radiation effect and is related to privacy problem so that and active imaging system can not be fine by people
Receiving.Passive imaging system does not need emission source, by human body and the outside radiated electromagnetic wave of other articles, and due to different
Object is different from the contrast of the radiation temperature of human body, and the electromagnetic radiation of different objects is detected by detector, is processed
Analysis obtains image.Compared to active imaging system, passive imaging system design is complex, and sensitivity is relatively low, but
It does not exist radiation source, and the characteristics of with hidden and cleaning, imaging does not exist scintillation effect, is difficult by polarization and edge scatter
Influence, and hide object and easily detected by passive imaging mode.Therefore, in recent years, the domestic and international researcher in the field
Further investigation is quick, the passive safety check imaging technique of high spatial resolution, and makes some progress.Britain
The public affairs such as Thruvision, the Millitech in the U.S., Brijot, Millisision, Trex Enterprise, the NEC of Japan
Department has been achieved with certain achievement in research in terms of passive safety check imaging, domestic such as middle electric 38 institute, Capital Normal University and
Some scientific research institutions of space flight have also made significant headway in the research that passive safety check is imaged.However, at present can practical application
Passive THz/MMW imaging rays safety detection apparatus in public places such as customs, airport, subway safety checks also have that imaging time is more long, sky
Between resolution ratio is low, high cost the problems such as, cause technical research productization development slow.
The content of the invention
The purpose of the present invention is to propose to a kind of video speed scanning system based on passive type terahertz imaging, realize improving
Image taking speed.
To achieve these goals, the technical scheme is that：
A kind of video speed scanning system based on passive type terahertz imaging, including gather the first wedge shape of scanned object
Mirror, the second wedge-shaped mirrors and feed antenna, the wedge-shaped mirrors have wedge surface reflecting surface and flat bottom corresponding thereto；Wherein, it is described
System also includes di-lens, and the downside that second wedge-shaped mirrors are vertically set on the first wedge-shaped mirrors receives the first wedge-shaped mirrors
Reflection scanning optical information, the di-lens is vertically set between the first wedge-shaped mirrors and the second wedge-shaped mirrors, for optically focused first
The reflected light information of wedge-shaped mirrors projects the second wedge-shaped mirrors, and the light projection transmission direction of di-lens is perpendicular to the ground, described
Feed antenna is used to receive the optical information of the second wedge-shaped mirrors reflection.
Scheme is further：The first wedge-shaped mirrors wedge surface reflecting surface is swept for carrying out transverse field direction to scanned object
Retouch, the second wedge-shaped mirrors wedge surface reflecting surface is used for the transmission optical information of longitudinal scanning reception and reflecting medium lens.
Scheme is further：The first wedge-shaped mirrors wedge surface reflecting surface center is 1.20m with scanned object horizontal range,
First wedge-shaped mirrors wedge surface reflecting surface is 35 degree with scanned object to the initial tilt angle of ground vertical plane, the di-lens
Center and the first wedge-shaped mirrors wedge surface reflecting surface central line distance are 0.42m, the di-lens center and the second wedge-shaped mirrors wedge
Face reflecting surface central line distance is 0.60m, and the second wedge-shaped mirrors wedge surface reflecting surface slanted angle perpendicular to the ground is 45 degree, described
Feed antenna is the air line distance of horn feed array, feed array received face center and the second wedge-shaped mirrors wedge surface reflecting surface center
It is 0.658m.
Scheme is further：The medium of the di-lens is polyethylene or polytetrafluoroethylene (PTFE), the light hole of di-lens
Footpath is 560mm；The aperture of first wedge-shaped mirrors is 600mm, and the aperture of second wedge-shaped mirrors is 500 mm, the first wedge
The wedge surface reflecting surface of shape mirror and the second wedge-shaped mirrors and the angle of flat bottom are 10 degree.
Scheme is further：The horn feed array includes diagonal horn antenna, and the diagonal horn antenna has 9,9
Individual diagonal horn antenna point three rows, often arrange 3, arrange and be arranged on to being staggered on a flat board, 9 diagonal horn antennas and work(
Divide device connection, the power splitter is 9 waveguiding structures, and 9 waveguiding structure is corresponding with 9 diagonal horn antennas to be divided into three
Group waveguide, each group of waveguide has three waveguide input interfaces and three waveguide output interfaces, and three groups of the 9 of waveguide waveguides inputs connect
9 diagonal horn antennas order arrangement same verticals of mouth and three rows are connected to the output of diagonal horn antenna in slab end-face straight line
On interface.
Scheme is further：The power splitter is provided with waveguide loss guiding export structure, and the waveguide loss guiding is defeated
Going out structure is：By each group of the three of waveguide adjacent waveguide input interfaces and corresponding three adjacent waveguides in three groups of waveguides
Order is first wave guide input interface, second waveguide input interface and the 3rd waveguide input interface and first to output interface respectively
Waveguide output interface, second waveguide output interface and the 3rd waveguide output interface, wherein, first wave guide input interface and the second ripple
It is connected with the 3rd waveguide input interface waveguide again after leading input interface waveguide connection, then three groups of mutual waveguides of waveguide input interface
Connection；Connect with the 3rd waveguide input outgoing interface waveguide again after first wave guide output interface and second waveguide output interface waveguide connection
Connect, then three groups of mutual waveguide connections of waveguide output interface；By three groups of mutual waveguide connection ends of waveguide input interface and three groups of ripples
Leading the mutual waveguide connection end of output interface carries out guiding output end as power splitter waveguide loss after waveguide connection.
Scheme is further：Bore is the rectangular horn of 12.8 mm × 14.6mm in the loudspeaker of the diagonal horn antenna
Mouthful, the output interface of the input interface of the waveguide and the diagonal horn antenna is standard W frequency ranges waveguide mouthful.
Scheme is further：The spacing often arranged between 3 diagonal horn antennas is 35mm, between row and row vertical
Distance is 35mm.
Present invention improves terahertz wave band closely passive safety check imaging time shortcoming more long, using di-lens,
The mode that dual rotary wedge surface mirror and detector array are combined realizes the quick video speed scanning of high-resolution；Control is simple, essence
Degree is high, it is adaptable to closely Terahertz safety check imaging field.
Invention is described in detail with reference to the accompanying drawings and examples.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is feed antenna structural representation of the present invention；
Fig. 3 is power splitter waveguiding structure schematic diagram of the present invention.
Specific embodiment
A kind of video speed scanning system based on passive type terahertz imaging, as shown in figure 1, the system includes collection
First wedge-shaped mirrors 2 of scanned object 1, the second wedge-shaped mirrors 3 and feed antenna 4, the wedge-shaped mirrors have flat bottom 201,301 and
Wedge surface reflecting surface 202,302 corresponding thereto；Wherein, the system also includes di-lens 5, and second wedge-shaped mirrors are vertical
The downside for being arranged on the first wedge-shaped mirrors receives the reflection scanning optical information of the first wedge-shaped mirrors, and the di-lens is vertically set on the
Between one wedge-shaped mirrors and the second wedge-shaped mirrors, the reflected light information for the wedge-shaped mirrors of optically focused first projects the second wedge-shaped mirrors, medium
The light projection transmission direction of lens is perpendicular to the ground, and the feed antenna is used to receive the optical information of the second wedge-shaped mirrors reflection.
In embodiment：The first wedge-shaped mirrors wedge surface reflecting surface is used for being swept towards scanned object 1 and di-lens
Retouching object carries out the scanning in transverse field direction, and information is reflexed into di-lens 5, the second wedge-shaped mirrors wedge surface reflecting surface direction
Di-lens and feed antenna 4 are used to receive the transmission optical information with reflecting medium lens, and optical information is sent into feed day
Line.
In embodiment：The first wedge-shaped mirrors wedge surface reflecting surface center is 1.20m, first with scanned object horizontal range
Wedge-shaped mirrors wedge surface reflecting surface is 35 degree with the initial tilt angle a of scanned object to ground vertical plane, in the di-lens
The heart and the first wedge-shaped mirrors wedge surface reflecting surface central line distance are 0.42m, the di-lens center and the second wedge-shaped mirrors wedge surface
Reflecting surface central line distance is 0.60m, and the second wedge-shaped mirrors wedge surface reflecting surface slanted angle b perpendicular to the ground is 45 degree, described
Feed antenna is the air line distance of horn feed array, feed array received face center and the second wedge-shaped mirrors wedge surface reflecting surface center
It is 0.658m.
In embodiment：The medium of the di-lens is polyethylene or polytetrafluoroethylene (PTFE), and the clear aperature of di-lens is
560mm；The aperture of first wedge-shaped mirrors is 600mm, and the aperture of second wedge-shaped mirrors is 500 mm, first wedge-shaped mirrors
It it is 10 degree with the wedge surface reflecting surface of the second wedge-shaped mirrors and the angle of flat bottom.
The first wedge-shaped mirrors in embodiment positioned at di-lens front end carry out the scanning of horizontal direction to testee, and will be corresponding
THz reflexes to di-lens.Di-lens is used for Focused Gaussian Beam, and transmits it to positioned at di-lens and reception antenna
Between the second wedge-shaped mirrors, the scanning of the second wedge-shaped mirrors longitudinal direction；Second wedge-shaped mirrors complete longitudinal scanning while, by light
Information reflexes to feed receiving antenna array, is finally received by detector.First wedge-shaped mirrors and the second wedge-shaped mirrors have cooperated
The scanning of paired testee two-dimensional directional；First wedge-shaped mirrors and the second wedge-shaped mirrors are rotated by direct current generator respectively.
The wedge surface and the angle of its another plane, the i.e. angle of wedge of the wedge surface mirror 1,3 are all 10 degree.
Scheme is further：The clear aperature of the di-lens is 560mm, the rotation positioned at di-lens front end
The aperture of wedge surface mirror 1 is 600mm, the wedge surface mirror 3 between di-lens front end and di-lens and reception antenna
Aperture be 500 mm.
Di-lens minute surface is 90 ° vertical fixed with the angle of vertical direction, and the adjustment of five dimensions can be installed in installation process
Frame carries out the vernier focusing of position.The di-lens main purpose is to realize the focusing of Gaussian beam.
Embodiment realizes that low-loss space propagation and control Gaussian beam are realized focusing on using medium transmission component, and
Using the rotation of folding wedge face speculum and the combination of multi channel detector array format, closely high spatial point can be further improved
The image taking speed of resolution, its image taking speed can reach the video speed of 20 frames/s.
Embodiment is completed by two different wedge surface mirror difference rotation sweeps in position, in the absence of the reciprocal of traditional scanning element
Acceleration and deceleration motion, can keep element velocity of rotation very high, and then improve image taking speed.Revolving scan mode is not only solved
Reciprocally swinging of having determined has that acceleration and deceleration sweep time is long, and mechanical oscillation are also reduced to a certain extent, improves and is
The stability of system.And the scanning system combination multichannel receiver array way, can well cover target area to be measured.
Therefore, the scanning antenna system imaging speed can reach the video speed of 20 frames/s, the characteristic of this high-resolution fast imaging
In can be applied to millimeter wave/terahertz wave band safety check imaging device, can be to ensconcing some non-metallic weapons in human body clothing
Effective detection imaging is carried out Deng some contrabands, with very big application value.
In embodiment, as shown in Fig. 2 feed antenna includes horn feed array and power splitter 6；The horn feed array
Including diagonal horn antenna 7, the diagonal horn antenna has 9, and 9 three rows of diagonal horn antenna point often arrange 3, arrange to friendship
Mistake is arranged on a flat board 8, and 9 diagonal horn antennas are connected with power splitter, as shown in figure 3, the power splitter is 9 ripples
Guide structure, 9 waveguiding structure is corresponding with 9 diagonal horn antennas to be divided into three groups of waveguides, and each group of waveguide has three
Waveguide input interface 601 and three waveguide output interfaces 602, three groups of the 9 of waveguide waveguide input interfaces and the diagonal loudspeaker of three rows 9
Antenna order arrangement same vertical is connected on the output interface of diagonal horn antenna in slab end-face straight line；The diagonal loudspeaker
Antenna and power splitter are fixed on a support, and the support is made up of two flat boards being arranged in a mutually vertical manner
" L " type right angle rack, the diagonal horn antenna is fixed on a flat board 8, and the power splitter is fixed on another and puts down
On plate 9.
In embodiment：As shown in figure 3,：The power splitter is provided with waveguide loss guiding export structure, the waveguide loss
Guiding export structure is：By each group of the three of waveguide adjacent waveguide input interfaces and corresponding three phases in three groups of waveguides
Adjacent wave leads output interface, and order is first wave guide input interface 601-1, second waveguide input interface 601-2 and the 3rd waveguide respectively
Input interface 601-3 and first wave guide output interface 602-1, second waveguide output interface 602-2 and the 3rd waveguide output connect
Mouth 602-3, because there is individually loss waveguide transmission structure in power splitter inside, therefore：Wherein, first wave guide input interface and
It is connected with the 3rd waveguide input interface again after the connection of two waveguide input interfaces, then three groups of mutual waveguides of waveguide input interface connect
Connect；Connect with the 3rd waveguide input outgoing interface waveguide again after first wave guide output interface and second waveguide output interface waveguide connection
Connect, then three groups of mutual waveguide connections of waveguide output interface；By three groups of mutual waveguide connection ends of waveguide input interface and three groups of ripples
Leading the mutual waveguide connection end of output interface carries out guiding output end 603 as power splitter waveguide loss after waveguide connection.Every group of ripple
Between leading and each group 3 waveguides in inside are separate, concurrent working.Each input and output end 601 and 602 are directed to different feedbacks
Unlike signal strength difference received by source antenna, is made up by the difference of each corresponding loss waveguiding structure in power splitter inside, many
Remaining loss is by 603 outputs.
In embodiment：Bore is the rectangular horn mouthful of 12.8 mm × 14.6mm in the loudspeaker of the diagonal horn antenna,
The output interface of the input interface of the waveguide and the diagonal horn antenna is standard W frequency ranges waveguide mouthful.
In embodiment：The spacing often arranged between 3 diagonal horn antennas is 35mm, vertical range between row and row
It is 35mm.
Above-described embodiment focus device uses heavy caliber di-lens, the closely large area high-resolution based on design
Scanning probe and feed it is with a tight waist, according to the propagation law of Gaussian beam, the mouth face diameter of lens uses 3 ω（ω is high bass wave
Beam radius）, can so cause that energy is reflected entirely substantially, played for the loss in passive detection system reduction transmitting procedure
Very big effect.The scan mode that scanning system is rotated using folding wedge face mirror, i.e., positioned at the first wedge surface mirror of di-lens front end
Scanning for carrying out horizontal direction to testee, the second wedge surface mirror between di-lens and reception antenna is used to indulge
To the scanning in direction,；And use the array acceptor array way of 9 passage 3 × 3, with receiver performance（Mainly receiver
The time of integration）Under conditions of matching, the rotating speed of wedge surface speculum is set, it is possible to achieve 1m detection ranges, 7-8mm high spatials point
Resolution and fast imaging.Also, the quasi-optical antenna system can be applied in millimeter wave/terahertz wave band, on being swept in wide-angle
The focal spot aberration problems occurred during retouching, can be corrected in the recovery treatment of image by some algorithms.The system is burnt
Plane uses array acceptor form, and two-dimentional machinery scanning bores scanning for transverse and longitudinal ellipse of revolution, and this method for designing was both avoided
Level crossing is swung back and forth and there are acceleration and deceleration, shortens sweep time, and whole coverings of FOV can be met again, and
The requirement of continuous rotation control requires low with the control of continuous pitching and stability is higher, can reduce to a certain extent
Cost.Focus device equally selects lens --- di-lens, realize that high-resolution low-loss transmission is imaged, for passive safety check
System is most important.
Two rotation wedge surface mirrors realize respectively to horizontal and vertical respectively around respective rotary shaft by continuously at the uniform velocity being rotated
The scanning in direction.
Reception antenna feed array and the angle of vertical direction in embodiment are 90 ° of fixations.The field range of imaging is
160 × 80cm, the channel array of detector 9, sampled point meets sampling thheorem, i.e., at least sampled 3 in each 3dB beam angle
Point, single channel scanning is be not less than time used by its inswept wave beam unit the time of integration 2 times.
Embodiment to the complete scan of target 80cm × 160cm scopes to be measured, then need folding wedge face scarnning mirror speed
Match somebody with somebody, therefore Machinery Control System is critically important.To ensure synchronous control, the rotation of revolving mirror passes through dividing for the different motor of rotating speed
Uniform rotation control is not carried out, so as to carry out the scanning respectively of transverse direction, vertical direction.The scan mode of two-dimensional directional uses rotating speed
Different rotation sweeps, elliptic cone is scanned due to the reciprocating motion in the absence of scanning element, and element very high can be kept to rotate
Speed, and then improve image taking speed.And the bore of minute surface in the present system is all relatively large, the quantity of minute surface is reduced so that
The occlusion issue of ripple transmission is less prone in system, the diffraction loss in transmission is also reduced to a certain extent.
The rotation in embodiment selection folding wedge face, the i.e. scan mode of two-dimensional elliptic bevel-type, biosynthesis locus are one screw type
Scanning track.This scan mode is closely related with the arrangement mode of reception antenna, causes focal spot in the ken because elliptic cone is scanned
In the range of target to be measured edge covering it is fine, but it is sparse in center, do not met with imaging requirements, so that connecing
The increase of passage is received, sample rate is improved.Antenna element mode is also critically important, for the row that the system uses 3 × 3 staggered arrays
Mode for cloth.
Claims (8)
1. a kind of the first wedge shape of video speed scanning system based on passive type terahertz imaging, including collection scanned object
Mirror, the second wedge-shaped mirrors and feed antenna, the wedge-shaped mirrors have wedge surface reflecting surface and flat bottom corresponding thereto；Its feature exists
In the system also includes di-lens, and the downside that second wedge-shaped mirrors are vertically set on the first wedge-shaped mirrors receives first
The reflection scanning optical information of wedge-shaped mirrors, the di-lens is vertically set between the first wedge-shaped mirrors and the second wedge-shaped mirrors, is used for
The reflected light information of the wedge-shaped mirrors of optically focused first projects the second wedge-shaped mirrors, and light projection transmission direction and the ground of di-lens are hung down
Directly, the feed antenna is used to receive the optical information of the second wedge-shaped mirrors reflection.
2. scanning system according to claim 1, it is characterised in that the first wedge-shaped mirrors wedge surface reflecting surface is used for quilt
Scanning object carries out the scanning in transverse field direction, and the second wedge-shaped mirrors wedge surface reflecting surface is used for longitudinal scanning and receives and reflecting medium
The transmission optical information of lens.
3. scanning system according to claim 2, it is characterised in that the first wedge-shaped mirrors wedge surface reflecting surface center and quilt
Scanning object horizontal range is 1.20m, and the first wedge-shaped mirrors wedge surface reflecting surface inclines with the initial of scanned object to ground vertical plane
Oblique angle is 35 degree, and the di-lens center and the first wedge-shaped mirrors wedge surface reflecting surface central line distance are 0.42m, are given an account of
Matter lens centre is 0.60m, the second wedge-shaped mirrors wedge surface reflecting surface and ground with the second wedge-shaped mirrors wedge surface reflecting surface central line distance
Face vertical tilt angle is 45 degree, and the feed antenna is horn feed array, feed array received face center and the second wedge shape
The air line distance at mirror wedge surface reflecting surface center is 0.658m.
4. the scanning system according to claim 1 or 2 or 3, it is characterised in that the medium of the di-lens is polyethylene
Or polytetrafluoroethylene (PTFE), the clear aperature of di-lens is 560mm；The aperture of first wedge-shaped mirrors is 600mm, second wedge
The aperture of shape mirror is 500 mm, and the wedge surface reflecting surface of first wedge-shaped mirrors and the second wedge-shaped mirrors and the angle of flat bottom are 10
Degree.
5. scanning system according to claim 3, it is characterised in that the horn feed array includes diagonal horn day
Line, the diagonal horn antenna has 9,9 three rows of diagonal horn antennas point, often arranges 3, arranges one is arranged on to being staggered
On flat board, 9 diagonal horn antennas are connected with power splitter, and the power splitter is 9 waveguiding structures, 9 waveguiding structure and described 9
Individual diagonal horn antenna is corresponding to be divided into three groups of waveguides, and each group of waveguide has three waveguide input interfaces and three waveguide outputs to connect
Mouthful, 9 diagonal horn antenna order arrangement same verticals of three groups of the 9 of waveguide waveguide input interfaces and three rows are straight in slab end-face
Line is connected on the output interface of diagonal horn antenna.
6. diagonal horn antenna array according to claim 5, it is characterised in that the power splitter is provided with waveguide loss
Guiding export structure, the waveguide loss guiding export structure is：It is adjacent by each group the three of waveguide in three groups of waveguides
Waveguide input interface and corresponding three adjacent waveguide output interfaces are sequentially respectively first wave guide input interface, second waveguide is defeated
Incoming interface and the 3rd waveguide input interface and first wave guide output interface, second waveguide output interface and the 3rd waveguide output connect
Mouthful, wherein, first wave guide input interface and the waveguide of second waveguide input interface connection after again with the 3rd waveguide input interface waveguide
Connection, then three groups of mutual waveguide connections of waveguide input interface；First wave guide output interface and second waveguide output interface waveguide
It is connected with the 3rd waveguide input outgoing interface waveguide again after connection, then three groups of mutual waveguide connections of waveguide output interface；By three groups
The mutual waveguide connection end of waveguide input interface and three groups of mutual waveguide connection ends of waveguide output interface carry out conduct after waveguide connection
Power splitter waveguide loss guides output end.
7. diagonal horn antenna array according to claim 5, it is characterised in that in the loudspeaker of the diagonal horn antenna
Bore is the rectangular horn mouthful of 12.8mm × 14.6mm, and the output of the input interface of the waveguide and the diagonal horn antenna connects
Mouth is standard W frequency ranges waveguide mouthful.
8. diagonal horn antenna array according to claim 5, it is characterised in that described often to arrange 3 diagonal horn antennas
Between spacing be 35mm, vertical range between row and row is 35mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108646304A (en) * | 2018-07-02 | 2018-10-12 | 常州感通威视微波科技有限公司 | active imaging system |
| CN109471196A (en) * | 2018-12-29 | 2019-03-15 | 同方威视技术股份有限公司 | Millimeter wave terahertz imaging equipment and object identification classification method |
| CN110031907A (en) * | 2019-04-18 | 2019-07-19 | 西安天和防务技术股份有限公司 | Optical mechaical scanning imaging system |
| EP3845930A1 (en) * | 2019-12-30 | 2021-07-07 | Tsinghua University | Passive security checking device and receiving antenna unit thereof |
| CN114324345A (en) * | 2021-11-01 | 2022-04-12 | 清华大学深圳国际研究生院 | Material imaging method and device, terminal equipment and storage medium |
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