CN106772638B - W-waveband passive millimeter wave imaging system for safety check - Google Patents
W-waveband passive millimeter wave imaging system for safety check Download PDFInfo
- Publication number
- CN106772638B CN106772638B CN201611176307.2A CN201611176307A CN106772638B CN 106772638 B CN106772638 B CN 106772638B CN 201611176307 A CN201611176307 A CN 201611176307A CN 106772638 B CN106772638 B CN 106772638B
- Authority
- CN
- China
- Prior art keywords
- millimeter wave
- longitudinal
- turntable
- waveband
- horizontal direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
Abstract
The invention discloses a kind of W-waveband passive millimeter wave imaging systems for safety check, belong to safety check technical field.The system comprises W-waveband millimeter wave radiometer, Cassegrain antenna, smooth metal reflecting surface, horizontal direction turntable, longitudinal turntable, signal acquisition unit, computer and PLC control units；Smooth metal reflecting surface is fixed on longitudinal turntable at 45 degree of angles, longitudinal turntable and Cassegrain antenna are coaxially fixed on horizontal direction turntable, the feed of Cassegrain antenna is connected by waveguide with millimeter wave radiometer, millimeter wave radiometer is connect with signal acquisition unit, and signal acquisition unit is connect with computer.Imaging system structure of the present invention is simple, at low cost, small in size, low in energy consumption, stability is high, image taking speed is fast, and the dangerous goods hidden on the person can be effectively detected out.
Description
Technical field
The invention belongs to safety check technical fields, are related to a kind of imaging system more particularly to a kind of W-waveband quilt for safety check
Dynamic millimeter wave imaging system and its method.
Background technique
As people are increasingly enhanced the concern of safety problem, all to the safety of safe examination system, reliability and intelligence
More stringent requirements are proposed.Present safety check department mainly uses the contraband in X-ray safety check instrument detection luggage, and safety check detects energy
Power is strong, can get the higher fluoroscopy images of resolution ratio, but X-ray ionization harm to the human body is larger, cannot be used to detect people
Hiding contraband with it.Even if there is currently the X-ray machines of low radiation dose, but it is still not easy to be accepted by the public.Such as
So-called its essence of " dim light " human body safety check instrument that production is opened in Anhui road up to by domestic security protection company is exactly the X-ray using low dosage
Safety check imaging is carried out to human body, starts in April, 2016 successively to make in Chengdu east railway station and Chengdu Shuangliu International Airport investment
With, but report is disclosed once associated specialist, common people's fear is caused immediately, and on October 10th, 2016 is by State Ministry of Environmental Protection to add
The form of anxious file orders to deactivate immediately.
Using metal detector, whether the person on have metal, but cannot detect the shape of metal if can detecte,
Can not judge whether it is safe hard goods, for example have metal ingredient in artificial limb, it is also possible to wherein keep gun, metal detection
Device cannot in artificial limb metal and gun distinguish, and metal detector needs test object to cooperate, and efficiency is too low.
Due to mm-wave imaging technology detection the person on hide in terms of have advantageous advantage, so
Mm-wave imaging technology is for safety check at a research hotspot in recent years.It is worked based on active human body safety check imaging technique
Principle is similar with radar, by Millimeter-Wave Source to human-body emitting millimeter wave, and then by receiving machine testing and human body interaction
Millimeter wave electromagnetic field afterwards, so that human body be imaged.Typical represent has the Provision series of L-3Security company to produce
Product, the PNNL intelligent scanning mm-wave imaging instrument in the U.S. laboratory TNNL and Southwest Microwave company
The advantages of INTERPID imager etc., this kind of imaging system is that millimeter wave belongs to Non-ionizing radiation, and radiation hazradial bundle is smaller, and can
To obtain very high-resolution.But influenced when short distance is imaged by angle scintillations effect etc. bigger, it is difficult to overcome in imaging
This problem；In addition, what kind of biological effect millimeter-wave radiation can generate to organism on earth, do not come to a conclusion still at present,
So active millimeter wave imaging technique still remains unknown radiation safety problem for safety check.
Passive millimeter imaging technology is compared by detecting the millimeter-wave radiation capacity volume variance of target itself
Picture does not need radiation source, is perfectly safe to human body, and the textiles such as clothing are to millimeter wave almost unobstructed effect, so suitable
For carrying out safety check imaging to human body.According to the difference of imaging system, passive millimeter wave imaging technique is broadly divided into following four:
First is that phased array imaging technology, replaces mechanical scanning using electron scanning.Phased array antenna is by two-dimensional array unit
Composition, each receiving unit are connected with a phase shifter, by controlling and receiving the phase and amplitude of unit, realize antenna beam
The ken.The advantages of technology is that system bulk is smaller, and image taking speed quickly, can be realized real time imagery.But antenna structure is multiple
It is miscellaneous, it is more difficult to realize a high-resolution system, studied at present for imaging and passive imaging it is less, still be in development phase.
Second is that synthetic aperture imaging technology, simulates one for the antenna combination of multiple smaller aperture dues using partially coherent principle
The effect of wide aperture antenna.Such as the NEC Corporation of Japan has developed model machine based on synthetic aperture imaging, German Space Agency is ground
Ground and airborne Ka wave band and W-waveband synthetic aperture radiometers image-forming system etc. are produced.Program technology relative maturity, but
It is to need multiple receiving unit composition thinned arrays, design cost and hardware cost are still very high.
Third is that focal plane array image-forming technology, generallys use parabola antenna or lens antenna focuses, using plurality of cells
Antenna is distributed on focal plane and to the multiple spot in multiple target region while being imaged with the use of reflecting surface structure.It is typical to represent
There is the PMMW of the type products such as Vela125, X250, S350 of Millivision company, the U.S., Lockheed Martin company
Imager model machine and the focal plane imaging instrument of Northrop Grumman company etc..The technology can greatly shorten imaging time,
But system complexity is higher, and using focal plane arrays (FPA) as receiving unit, so that hardware cost is sufficiently expensive.
Fourth is that traditional mechanical scanning imaging technique, is more original millimeter-wave radiation imaging mode.This kind of mode is adopted
The antenna for using beam angle narrow scans entire scene as receiver, by mechanical movement to obtain the image of scene.Example
As the single channel scanning imaging system of Millivision company, the U.S., country, Ukraine superconduction radio research center are developed
8mm band imaging system etc..Common scanning mode needs constantly acceleration-deceleration based on rank scanning, in scanning process,
Imaging time is longer, and resolution ratio is lower；Or have improved procedure, by the way of another dimension mechanical scanning of electronically scanning at one dimension, add
Speed imaging time, but need to line up array using multiple receivers, considerably increase system cost.The advantages of system
It is that principle is simple, advantage of lower cost reduces imaging time if improved to some extent on imaging mode, does not need some
It is then quite applicable that the occasion of real time imagery, which carries out human body safety check imaging,.
Summary of the invention
It is an object of the invention to overcome deficiency existing for existing passive millimeter wave imaging system, provide a kind of for safety check
W-waveband passive millimeter wave imaging system, which has many advantages, such as image taking speed fast, high resolution, at low cost, can be effective
It is quickly detected from the dangerous goods hidden on the person.
The present invention adopts the following technical scheme:
A kind of W-waveband passive millimeter wave imaging system for safety check, including W-waveband millimeter wave radiometer, horizontal direction
Turntable, scanning platform, Cassegrain antenna, smooth metal reflecting surface, longitudinal support for rotary disc, longitudinal turntable and control system,
It is characterized by: the horizontal direction turntable is set on scanning platform, Cassegrain antenna is fixedly installed in horizontal direction and turns
Disk side, smooth metal reflecting surface is fixedly installed in the horizontal direction turntable other side by longitudinal turntable and smooth metal reflects
Face is opposite with Cassegrain antenna principal reflection mouth face axle center and angle at 45 ° therewith.
The horizontal direction turntable controls uniform rotation by a horizontal step motor, and the longitudinal direction turntable passes through one
Longitudinal stepper motor drives the uniform rotation of smooth metal reflecting surface.
Horizontal direction turntable side is additionally provided with close switch a baffle, two horizontal fiber sensor baffles,
For the start-stop position of controlled level direction rotation and the effective coverage of horizontal direction visual field.Wherein swept close on the outside of switch baffle
It retouches and is additionally provided with corresponding two on platform close to switch, the maximum rotation angle of horizontal direction by two close switches and connects
Nearly switch baffle control；When being turned to close to the position of the switch shielding plate, horizontal rotating disc is just rotated backward, and so on；Institute
It states and is provided with horizontal fiber sensor, every turn of a horizontal rotating disc week on the outside of two horizontal fiber sensor baffles on scanning platform
Phase, two horizontal fiber sensor baffles successively pass through horizontal fiber sensor, respectively generate a start pulse signal, indicate
The transversal scanning to target scene is realized in the effective coverage of horizontal direction visual field.
It is provided with longitudinal fibre optical sensor baffle on the longitudinal direction turntable, longitudinal optical fiber is provided on longitudinal support for rotary disc and is passed
Sensor, for longitudinal fibre optical sensor baffle with longitudinal turntable each rotation, longitudinal fibre optical sensor just obtains a trigger pulse letter
Number, indicate the beginning longitudinally acquired, further according to realistic objective size by acquisition delay, the longitudinal direction of target scene is swept in realization
It retouches.
The horizontal direction stepper motor and longitudinal stepper motor are controlled by control system.
The W-waveband radiometer input terminal is connected with the feed of Cassegrain antenna by waveguide and is fixed on Cassegrain
The back side of antenna main reflector, output end connect control system, export scanning result.
Further, the control system includes computer, data acquisition unit and PLC control unit, and the data are adopted
The input terminal of collection unit is connect with the output end of W-waveband millimeter wave radiometer, carries out data acquisition to radiometer output signal；Number
It is connected according to the output end of acquisition unit with computer, carries out follow-up data processing and image restores；The horizontal direction stepping electricity
The rotation of machine and longitudinal stepper motor is controlled by PLC control unit.
Further, described 45 ° of horizontal direction turntable maximum rotation angle, the longitudinal direction turntable is 360 ° of uniform rotation,
Longitudinal imaging viewing field can be adjusted flexibly according to realistic objective size by the section of control data acquisition.
Further, the W-waveband millimeter wave radiometer includes millimeter wave low-noise amplifier LNA concatenation unit, detection
Device unit, video amplifier unit；The millimeter wave energy for observing scene radiation passes through smooth metal reflective surface to card plug lattice
It is received after human relations antenna line focus by feed, the millimeter-wave signal received is transmitted to W-waveband millimeter amplitude by waveguide by feed
Meter is penetrated, is amplified by the amplification of LNA concatenation unit, detection unit detection and video amplification unit, output and observation scene radiation
The linear voltage signal of millimeter wave energy.
Further, there is the flabellum at the uniform velocity rotated to cut antenna beam before the Cassegrain antenna feed, pasted on flabellum
Absorbing material is applied, switches wave beam constantly between observation scene and flabellum, makes radiometer output AC voltage signal, at the uniform velocity revolve
The fan turned plays the role of applied mechanical modulation, and the revolving speed of flabellum namely the frequency of modulation are always positioned at video amplifier unit
Passband in.
Specifically, system controls two stepper motors by PLC control unit and drives level during scanning imagery
Turntable and longitudinal turntable according to the revolving speed set while rotating, and are scanned respectively to the horizontal and vertical of target scene.?
Two horizontal fiber sensor baffles successively pass through the pulse signal of horizontal fiber sensor generation in horizontal rotating disc rotation process
Control to a width complete object scene image data acquisition beginning and end (two horizontal fiber sensor baffles are corresponding
Angle of circumference is less than two close to the corresponding angle of circumference of switch).Horizontal fiber sensor-triggered first time pulse signal, indicates pair
The beginning of target scene scanning and data acquisition, and the acquisition of each column data then passes through metal mirror rotation process in image
The pulse signal that middle longitudinal direction fibre optical sensor generates carries out delay acquisition and realizes, makes data acquisition unit just in metal mirror
The output voltage signal of radiometer is acquired during scanning target scene, i.e. metal mirror every revolution, number
A column pixel data of corresponding position in target scene is only acquired according to acquisition unit.After every column data acquisition terminates, under waiting
Primary longitudinal direction fibre optical sensor trigger pulse arrives, then carries out the acquisition of next column data, until horizontal fiber sensor second
Secondary trigger pulse, which arrives, completes the scanning and data acquisition of a width target scene image.The smooth metal reflecting surface is observation
The millimeter wave energy that the radiation of scene all directions comes is reflected into Cassegrain antenna, focuses on feed by Cassegrain antenna,
The radiometer being connected with feed can receive the millimeter wave energy that each beam direction radiation of scene is come in.Radiometer output
Voltage signal is finally delivered to computer through data acquisition unit acquisition and carries out data processing and image recovery.
The invention also discloses the imaging methods of above-mentioned imaging system: metal mirror is along axle center uniform rotation, with one
The optical fiber shielding plate for playing rotation is every primary by fibre optical sensor, and data acquisition unit just starts to adopt target scene progress data
Collection, metal mirror leave target scene and stop acquisition, and until next time, longitudinal fibre optical sensor generates trigger pulse, horizontal
Turntable just has turned through the deviation angle in a horizontal direction, then starts the data acquisition of next column, until whole picture scene number
It is completed according to acquisition；It is converted into the gray value or pseudo-colours value of pixel according to the amplitude of acquisition signal, makes millimeter on computers
Wave image.
The beneficial effects of the present invention are: W-waveband passive millimeter wave imaging system proposed by the present invention for safety check and
Its imaging method does not need local oscillator using W-waveband direct detection formula millimeter wave radiometer, small in size, low in energy consumption；With flabellum
On close to absorbing material fan cut wave beam, amplify the AC signal of generation, eliminate dc noise；In addition to taking into account and being
Cost of uniting and imaging time use spiral scan pattern, it is only necessary to two-dimentional machinery uniform rotation, unlike in translation scanning process
It needs to accelerate repeatedly, slow down, be conducive to mechanical stability, and scanning speed is faster.This system structure is simple, and stability is high,
The dangerous goods hidden on the person can be effectively detected out.
Detailed description of the invention
Fig. 1 is the overall structure block diagram of the embodiment of the present invention.
Fig. 2 is the schematic side view of scanning platform of the embodiment of the present invention.
Fig. 3 is the schematic top plan view of scanning platform of the embodiment of the present invention.
Fig. 4 is W-waveband millimeter wave radiometer structural schematic diagram used in the embodiment of the present invention.
Fig. 5 is scanning track schematic diagram of the embodiment of the present invention to objective plane.
Fig. 6 is the Preliminary Results figure that the embodiment of the present invention is scanned imaging to the target body for carrying metal gun.
Fig. 7 is the Preliminary Results figure that the embodiment of the present invention is scanned imaging to the target body for carrying sintex.
Fig. 8 is the Preliminary Results that the embodiment of the present invention is scanned imaging to the target body for carrying I-shaped object
Figure.
Specific embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
Attached drawing 1,2,3 is please referred to, present invention discloses a kind of W-waveband passive millimeter wave imaging system for safety check, institutes
The system of stating include smooth metal reflecting surface (1), the Cassegrain antenna (2) of 300mm bore, W-waveband millimeter wave radiometer (3),
Longitudinal turntable (4), the fibre optical sensor (5-1,5-2) being fixed on scanning platform, horizontal direction turntable (6), two close to opening
Close (8-1,8-2), data acquisition unit (9), computer (10).Wherein the smooth metal reflecting surface (1) and longitudinal optical fiber pass
Sensor baffle (7-4) is fixed on longitudinal turntable (4)；The feed phase of the W-waveband radiometer (3) and Cassegrain antenna (2)
Connect and is fixed on Cassegrain antenna primary reflection surface；The longitudinal direction turntable (4), Cassegrain antenna (2), two horizontal fibers
Sensor baffle (7-1,7-2) and close switch baffle (7-3) are each attached on horizontal direction turntable (6), wherein longitudinal turntable
(4) and Cassegrain antenna (2) is the opposite side for being coaxially fixed on horizontal rotating disc；The metal mirror (1) is fixed on 45° angle
On longitudinal turntable (4), center is aligned with cassette antenna feed；The output interface and number of the W-waveband millimeter wave radiometer (3)
It is connected according to acquisition unit (9)；The output end of the data acquisition unit (9) be connected with computer (10) carry out data processing and
Image restores.
The millimeter wave energy that the radiation of observation scene all directions comes is reflected into card plug lattice by the smooth metal reflecting surface (1)
The primary reflection surface of human relations antenna (2) focuses on feed by Cassegrain antenna (2), and the radiometer (3) being connected with feed can
To receive the millimeter wave energy that each beam direction radiation of scene is come in.
As shown in figure 4, the W-waveband millimeter wave radiometer by LNA concatenation unit 1 (3-1), LNA concatenation unit 2 (3-2),
Pick-up unit (3-3), video amplifier unit (3-4) composition, wherein the Cassegrain antenna feed and the LNA are cascaded
Unit 1 (3-1) is connected, and the LNA concatenation unit 1 (3-1) is connected with the LNA concatenation unit 2 (3-2), the LNA grades of receipts or other documents in duplicate
2 (3-2) of member are connected with the pick-up unit (3-3), the pick-up unit (3-3) and the video amplifier unit (3-
4) it is connected.The millimeter-wave radiation energy of scene is observed after Cassegrain antenna (2) convergence, by LNA concatenation unit (3-1,3-
2) amplification, pick-up unit (3-3) detection and video amplifier unit (3-4) amplification, the milli of output and observation scene radiation
The linear voltage signal of metric wave energy.
There is the flabellum at the uniform velocity rotated to cut antenna beam before Cassegrain antenna (2) feed, sticks suction wave on flabellum
Material switches wave beam constantly between observation scene and flabellum, and feed is made to receive ac voltage signal, and frequency is located at video
In amplifying unit passband, alternative radiometer is constituted, compared with DC radiometer, alternative radiometer only amplifies scene and inhales wave material
Difference between material, eliminates dc noise.
During scanning imagery, two stepper motors are controlled by PLC and drive horizontal rotating discs and longitudinal turntable according to setting
It the revolving speed set while rotating, the horizontal and vertical of target scene is scanned respectively.Horizontal direction turntable (6) is by a water
Flat step motor control, the rotation maximum angle of horizontal direction close to switch baffle (7-3) and two by connecing on horizontal rotating disc
Nearly switch (8-1,8-2) control, the rotation of horizontal rotating disc average rate are turned to whenever close to switch baffle (7-3) close to switch (8-1
Or 8-2) position when, horizontal rotating disc just back rotate, and so on.A, b as shown in Figure 3 are respectively the forward and reverse rotation of horizontal rotating disc
To the position of maximum angle.In the horizontal direction in turntable (6) rotation process two horizontal fiber sensor baffles (7-1,7-2) according to
It is secondary to pass through horizontal fiber sensor (5-1), two pulse signals are successively generated, a width complete object scene image data is controlled
Acquisition beginning and end (the corresponding angle of circumference of horizontal fiber sensor baffle (7-1,7-2) less than two close to switch (8-1,
8-2) corresponding angle of circumference), and the acquisition of each column data then passes through longitudinal light in metal mirror (1) rotation process in image
The pulse signal that fiber sensor baffle (7-4) is generated by longitudinal fibre optical sensor (5-2) every time carries out delay acquisition and realizes,
Make data acquisition unit just during metallic reflection Surface scan is to target scene to the output voltage signal of radiometer into
Row acquisition, i.e., metal mirror every revolution, data acquisition unit only acquire a column data of corresponding position in target scene.Such as
Fig. 5 show scanning platform to the scanning track schematic diagram of objective plane, wherein dotted line indicate to be scanned objective plane and
The track of data acquisition.For example, two horizontal fiber sensor baffles (7-1,7-2) successively pass through horizontal fiber sensor (5-
1) time interval is 5s, and the width of corresponding front 3m distant object scene is 1m, and the revolving speed of metal mirror is 8r/s, is adopted
The data of truck each column acquisition are 100, and the height of corresponding front 3m distant object scene is 2m, then complete single pass just
40 column datas, every column data 100 are obtained, this 40*100 data is to the distant place front 3m width 1m high 2m target scene
Imaging data.
The collected data of data acquisition unit, which are finally transferred to, carries out signal processing to computer, obtains millimeter wave figure
Picture.It is illustrated in figure 6 and the Preliminary Results of imaging is scanned to the target body for carrying metal gun, be illustrated in figure 7 to taking
Target body with sintex is scanned the Preliminary Results of imaging, is illustrated in figure 8 to the mesh for carrying I-shaped object
Mark human body is scanned the Preliminary Results of imaging.
Image-forming principle of the invention is as follows:
The object that temperature is higher than absolute zero in nature can be from shooting radiated electromagnetic wave, the electromagnetic wave energy distribution of radiation
In wide wave frequency range in, wherein in the range of bandwidth is B near millimeter-wave frequency f, object per surface
Product itself radiation millimeter wave power size by planck formula it follows that
Wherein phy symbol meaning are as follows:
The emissivity of ε --- object, between 0 and 1, the emissivity of black matrix is 1, and the emissivity of metal is 0.
K --- Boltzmann constant is 1.38 × 10-23J/K。
T0--- the physical temperature of object.
C --- the light velocity.
The millimeter wave power of visible oBject itself radiation is directly proportional to the physical temperature of object, and object not only itself radiates milli
Metric wave, also reflection impinge upon millimeter wave thereon, transmit the millimeter wave of background radiation, total millimeter wave energy of object radiation is usual
The resulting radiation temperature T of object can be usedETo measure:
TE=ε T0+ρTI+tTB (2)
Wherein, the reflectivity of ρ --- object
TI--- ambient illumination temperature
The transmissivity of t --- object
TB--- background radiation temperature
Different resulting radiation temperatures is presented since rate, reflectivity and transmissivity difference are hit in transmitting in the object of unlike material.
Such as metal is substantially reflection environment irradiation temperature (ε=0, ρ=1), human body absorbs millimeter wave (ε=0.5~0.9, ρ < mostly
0.5), and clothes then mainly allow millimeter wave transmit (t=0.3~0.8).Mm-wave imaging is based on the realization of this characteristic.
Radiometer receives the millimeter wave energy of scene radiation, and converts it into voltage output, the voltage of output are as follows:
Vd=CGRF(Ps+Prn) (3)
Wherein, GRFFor LNA concatenation unit gain, C (V/W) is detection tube sensitivity, PsThe millimeter wave received for radiometer
Signal power, PrnFor the noise power of radiometer itself.
The course of work of the invention is as follows: the system according to the mode to be scanned by PLC controlled level turntable (6) and
The revolving speed and scanning range of longitudinal turntable (4), while flabellum rotation cutting wave beam, millimeter wave radiometer (3) generate exchange video
Signal.First shielding plate (7-1 or 7-2) on horizontal rotating disc (6) generates a touching when passing through horizontal fiber sensor (5-1)
Pulse is sent out, system starts to be scanned a width complete object scene, smooth metal reflecting surface (1) every revolution, longitudinal light
Fine shielding plate (7-4) all can generate a triggering arteries and veins by longitudinal fibre optical sensor (5-2) in the fixation position set in advance
Punching, notification data acquisition unit (9) start to acquire the data of this column, and acquisition time is calculated by the distance and height of target scene
It determines, metal mirror (1) leaves target scene and stops acquisition, until longitudinal fibre optical sensor (5-2) generation next time
Trigger pulse arrives starts the data acquisition of next column again, until second shielding plate on horizontal rotating disc is passed by horizontal fiber
It is the scanning and data acquisition for completing a width target scene image that sensor (5-1), which generates trigger pulse,.Due to horizontal rotating disc and indulge
It is all uniform rotation to turntable, so collected every column data corresponds to equal height in target scene, alignment arrangement and phase
Mutually parallel rows of pixels.The vision signal of acquisition such as is denoised in a computer, is sharpened at the data processings, and amplitude turns
It changes gray scale or pseudo-colours into, just obtains the corresponding millimeter-wave image of target scene in this way.
Composition and image-forming principle of the present invention for the millimeter wave imaging system of safety check is described above, the present invention is disclosing
While above system, the imaging method of above system is also disclosed；This method comprises the following steps: metal mirror is even along axle center
Speed rotation, the optical fiber shielding plate rotated therewith is every primary by fibre optical sensor, and data acquisition unit just starts to target
Scene carries out data acquisition, and metal mirror leaves target scene and stops acquisition, and until next time, longitudinal fibre optical sensor is produced
Raw trigger pulse, horizontal rotating disc just have turned through the deviation angle in a horizontal direction, then start the data acquisition of next column,
Until the acquisition of whole picture contextual data is completed；It is converted into the gray value or pseudo-colours value of pixel according to the amplitude of acquisition signal, is counting
Millimeter-wave image is made on calculation machine.
In conclusion W-waveband passive millimeter wave imaging system proposed by the present invention and its imaging method, utilize direct detection
Formula millimeter wave radiometer does not need local oscillator, small in size, low in energy consumption；Wave beam is cut close to the fan of absorbing material on flabellum,
Amplify the AC signal generated, eliminates direct current and make an uproar field；In addition to taking into account system cost and imaging time, swept using spiral
Mode is retouched, i.e., two-dimensional scanning is carried out by horizontal and longitudinal two turntables uniform rotation simultaneously, wherein longitudinal turntable and cassette day
Line be it is concentric be fixed on horizontal rotating disc together, Cassegrain antenna receives the reflection of longitudinal turntable Smooth metal plate
The millimeter-wave radiation energy of target scene passes to millimeter wave radiometer, carries out single channel imaging.This system clever structure, surely
Qualitative height, image taking speed is fast, and the dangerous goods hidden on the person can be effectively detected out.
Description and application of the invention herein are illustrative, is not wishing to limit the scope of the invention to above-described embodiment
In.The deformation and change of embodiments disclosed herein are possible, the realities for those skilled in the art
The replacement and equivalent various parts for applying example are well known.It should be appreciated by the person skilled in the art that not departing from the present invention
Spirit or essential characteristics in the case where, the present invention can in other forms, structure, arrangement, ratio, and with other components,
Material and component are realized.Without departing from the scope and spirit of the present invention, can to embodiments disclosed herein into
The other deformations of row and change.
Claims (7)
1. a kind of W-waveband passive millimeter wave imaging system for safety check, including W-waveband millimeter wave radiometer, horizontal direction turn
Disk, scanning platform, Cassegrain antenna, smooth metal reflecting surface, longitudinal support for rotary disc, longitudinal turntable and control system,
Be characterized in that: the horizontal direction turntable is set on scanning platform, and Cassegrain antenna is fixedly installed in horizontal direction turntable
Side, smooth metal reflecting surface are fixedly installed in the horizontal direction turntable other side and smooth metal reflecting surface by longitudinal turntable
And therewith at 45 ° angle opposite with Cassegrain antenna principal reflection mouth face axle center；
The horizontal direction turntable controls uniform rotation by a horizontal step motor, and the longitudinal direction turntable passes through a longitudinal direction
Stepper motor drives the uniform rotation of smooth metal reflecting surface；
Horizontal direction turntable side is additionally provided with one close to switch baffle, two horizontal fiber sensor baffles, is used for
The start-stop position of controlled level direction rotation and the effective coverage of horizontal direction visual field；It is wherein flat close to scanning on the outside of switch baffle
Corresponding two are provided on platform close to switch, the maximum rotation angle of horizontal direction is by two close switches and close switch
Baffle control；When being turned to close to the position of the switch shielding plate, horizontal rotating disc is just rotated backward, and so on；It is described two
It is provided with horizontal fiber sensor on the outside of horizontal fiber sensor baffle on scanning platform, horizontal rotating disc is every to turn a cycle, and two
A horizontal fiber sensor baffle successively passes through horizontal fiber sensor, respectively generates a start pulse signal, indicates level
The transversal scanning to target scene is realized in the effective coverage of direction visual field；
It is provided with longitudinal fibre optical sensor baffle on the longitudinal direction turntable, is provided with longitudinal Fibre Optical Sensor on longitudinal support for rotary disc
Device, for longitudinal fibre optical sensor baffle with longitudinal turntable each rotation, longitudinal fibre optical sensor just obtains a start pulse signal,
It indicates the beginning longitudinally acquired, further according to realistic objective size by acquisition delay, realizes the longitudinal scanning to target scene.
2. a kind of W-waveband passive millimeter wave imaging system for safety check as described in claim 1, it is characterised in that: described
Horizontal direction stepper motor and longitudinal stepper motor are controlled by control system.
3. a kind of W-waveband passive millimeter wave imaging system for safety check as described in claim 1, it is characterised in that: described
There is the flabellum at the uniform velocity rotated to cut antenna beam before Cassegrain antenna feed, posts deposited absorbing material on flabellum, make wave beam not
Break and switches between observation scene and flabellum, radiometer output AC voltage signal.
4. a kind of W-waveband passive millimeter wave imaging system for safety check as described in claim 1, it is characterised in that: the W
Wave band radiometer input terminal is connected with the feed of Cassegrain antenna by waveguide and is fixed on Cassegrain antenna primary reflection surface
The back side, output end connect control system, export scanning result.
5. a kind of W-waveband passive millimeter wave imaging system for safety check as described in claim 1 or 4, it is characterised in that: institute
Stating control system includes computer, data acquisition unit and PLC control unit, the input terminal and W wave of the data acquisition unit
The output end connection of section millimeter wave radiometer, carries out data acquisition to radiometer output signal；The output end of data acquisition unit
It is connected with computer, carries out follow-up data processing and image restores；The horizontal direction stepper motor and longitudinal stepper motor
Rotation is controlled by PLC control unit.
6. a kind of W-waveband passive millimeter wave imaging system for safety check as described in claim 1, it is characterised in that: described
45 ° of angle of horizontal direction turntable maximum rotation, the longitudinal direction turntable is 360 ° of uniform rotation.
7. a kind of W-waveband passive millimeter wave imaging system for safety check as described in claim 1 or 4, it is characterised in that: institute
Stating W-waveband millimeter wave radiometer includes millimeter wave low-noise amplifier LNA concatenation unit, pick-up unit, video amplifier list
Member；Observe the millimeter wave energy of scene radiation by after smooth metal reflective surface to Cassegrain antenna line focus by feed
It receives, the millimeter-wave signal received is transmitted to W-waveband millimeter wave radiometer by waveguide by feed, by LNA concatenation unit
Amplification, detection unit detection and video amplification unit amplification, the linear pass of millimeter wave energy of output and observation scene radiation
The voltage signal of system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611176307.2A CN106772638B (en) | 2016-12-19 | 2016-12-19 | W-waveband passive millimeter wave imaging system for safety check |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611176307.2A CN106772638B (en) | 2016-12-19 | 2016-12-19 | W-waveband passive millimeter wave imaging system for safety check |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106772638A CN106772638A (en) | 2017-05-31 |
| CN106772638B true CN106772638B (en) | 2019-04-05 |
Family
ID=58890100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611176307.2A Expired - Fee Related CN106772638B (en) | 2016-12-19 | 2016-12-19 | W-waveband passive millimeter wave imaging system for safety check |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106772638B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761552B (en) * | 2018-03-16 | 2021-03-26 | 电子科技大学 | Active millimeter wave human body security check imaging system with dual-channel synchronous detection |
| CN108693564A (en) * | 2018-03-16 | 2018-10-23 | 电子科技大学 | W-waveband active MMW binary channels synchronous imaging system for human body safety check |
| CN108761553B (en) * | 2018-03-16 | 2021-03-26 | 电子科技大学 | Passive millimeter wave dual-channel synchronous imaging system for security inspection and imaging method thereof |
| CN108646304B (en) * | 2018-07-02 | 2024-03-12 | 常州感通威视微波科技有限公司 | Active imaging system |
| CN109297589A (en) * | 2018-08-28 | 2019-02-01 | 北京遥感设备研究所 | A kind of test macro for W-waveband radiometer infrared radiation characteristics |
| CN109581527B (en) * | 2018-12-21 | 2020-11-27 | 济南爱我本克网络科技有限公司 | Driving device and method for rotating mechanism of double-arm millimeter wave imaging system |
| CN109725363B (en) * | 2019-01-18 | 2020-11-24 | 徐州纽卡电子科技有限公司 | Millimeter wave imaging double-side scanning detection system |
| CN114063175A (en) * | 2021-11-12 | 2022-02-18 | 芜湖展旭物联网科技有限公司 | Optical fiber alkali loss detection equipment for computer network |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7385549B2 (en) * | 2003-08-12 | 2008-06-10 | Trex Enterprises Corp | Millimeter wave portal imaging system |
| CN101644770A (en) * | 2009-09-07 | 2010-02-10 | 哈尔滨工业大学 | Passive millimeter wave imaging system |
| CN101793963A (en) * | 2010-02-09 | 2010-08-04 | 中国科学院上海微系统与信息技术研究所 | Millimeter wave imaging system for security check and imaging method thereof |
| CN103904430A (en) * | 2014-04-04 | 2014-07-02 | 北京理工大学 | Terahertz beam two-dimensional mechanical scanning antenna feed system |
| CN104076358A (en) * | 2014-07-02 | 2014-10-01 | 北京遥感设备研究所 | Passive millimeter wave imaging security inspection equipment |
| CN105759315A (en) * | 2016-04-26 | 2016-07-13 | 深圳市无牙太赫兹科技有限公司 | Scanning mechanism and safety inspection instrument possessing the scanning mechanism |
| CN106154345A (en) * | 2015-03-27 | 2016-11-23 | 常州吉赫射频电子技术有限公司 | Ellipsoid passive millimeter wave imaging system |
-
2016
- 2016-12-19 CN CN201611176307.2A patent/CN106772638B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7385549B2 (en) * | 2003-08-12 | 2008-06-10 | Trex Enterprises Corp | Millimeter wave portal imaging system |
| CN101644770A (en) * | 2009-09-07 | 2010-02-10 | 哈尔滨工业大学 | Passive millimeter wave imaging system |
| CN101793963A (en) * | 2010-02-09 | 2010-08-04 | 中国科学院上海微系统与信息技术研究所 | Millimeter wave imaging system for security check and imaging method thereof |
| CN103904430A (en) * | 2014-04-04 | 2014-07-02 | 北京理工大学 | Terahertz beam two-dimensional mechanical scanning antenna feed system |
| CN104076358A (en) * | 2014-07-02 | 2014-10-01 | 北京遥感设备研究所 | Passive millimeter wave imaging security inspection equipment |
| CN106154345A (en) * | 2015-03-27 | 2016-11-23 | 常州吉赫射频电子技术有限公司 | Ellipsoid passive millimeter wave imaging system |
| CN105759315A (en) * | 2016-04-26 | 2016-07-13 | 深圳市无牙太赫兹科技有限公司 | Scanning mechanism and safety inspection instrument possessing the scanning mechanism |
Non-Patent Citations (2)
| Title |
|---|
| Design of High-Power Millimeter-Wave TM01–TE11 Mode Converters by the Differential Evolution Algorithm;Shiwen Yang等;《IEEE TRANSACTIONS ON PLASMA SCIENCE》;20050831;第33卷(第4期);第1372-1376页 * |
| W 波段 16 元完全采样焦平面线性阵列天线设计;陈其科 等;《红外与毫米波学报》;20130228;第32卷(第1期);第23-27页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106772638A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106772638B (en) | W-waveband passive millimeter wave imaging system for safety check | |
| CN108761553B (en) | Passive millimeter wave dual-channel synchronous imaging system for security inspection and imaging method thereof | |
| CN108761552B (en) | Active millimeter wave human body security check imaging system with dual-channel synchronous detection | |
| CN101793963A (en) | Millimeter wave imaging system for security check and imaging method thereof | |
| CN102809745B (en) | Hybrid millimeter wave imaging system and method | |
| CN101644770B (en) | Passive millimeter wave imaging system | |
| Sheen et al. | Active millimeter-wave standoff and portal imaging techniques for personnel screening | |
| CN106093937A (en) | A kind of microwave and millimeter wave human body security check system and safety inspection method | |
| WO2017107284A1 (en) | Human body security check system and method based on millimeter wave holographic three-dimensional imaging | |
| CN104076358B (en) | A kind of passive millimeter imaging rays safety detection apparatus | |
| CN102141618B (en) | Microwave staring imaging method | |
| CN105607140A (en) | Terahertz wave rapid rotation scanning imaging system and method | |
| CN103048694B (en) | A kind of foreign body detection system for airfield runway | |
| CN104932029A (en) | Active terahertz human body security inspection system device and adjustment method | |
| CN106707275A (en) | Active millimeter wave imaging method of planar scanning of sparse linear array | |
| WO2008054350A3 (en) | Multi-channel millimeter wave image system | |
| CN106154345A (en) | Ellipsoid passive millimeter wave imaging system | |
| CN110806590B (en) | Terahertz active and passive composite imaging quasi-optical scanning system | |
| CN108051868A (en) | Terahertz human body safety check imaging system | |
| CN110045367B (en) | Cylindrical array antenna target three-dimensional imaging device | |
| CN108693564A (en) | W-waveband active MMW binary channels synchronous imaging system for human body safety check | |
| CN106918843B (en) | A kind of video speed scanning system based on passive type terahertz imaging | |
| CN106501207B (en) | Terahertz two-dimensional imaging system and imaging method | |
| CN102520408A (en) | Three-dimensional imaging method for three-dimensional imaging system with cylindrical array surface | |
| CN207764388U (en) | Active continuous wave Terahertz human body cache detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190405 Termination date: 20211219 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |