CN106772638A - For the W-waveband passive millimeter wave imaging system of safety check - Google Patents
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- CN106772638A CN106772638A CN201611176307.2A CN201611176307A CN106772638A CN 106772638 A CN106772638 A CN 106772638A CN 201611176307 A CN201611176307 A CN 201611176307A CN 106772638 A CN106772638 A CN 106772638A
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- 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
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Abstract
The invention discloses a kind of W-waveband passive millimeter wave imaging system for safety check, belong to safety check technical field.The system includes W-waveband millimeter wave radiometer, Cassegrain antenna, smooth metal reflecting surface, horizontal direction rotating disk, longitudinal rotating disk, signal gathering unit, computer and PLC control unit；Smooth metal reflecting surface is fixed on longitudinal rotating disk into 45 degree of angles, longitudinal rotating disk and Cassegrain antenna are coaxially fixed on horizontal direction rotating disk, the feed of Cassegrain antenna is connected by waveguide with millimeter wave radiometer, millimeter wave radiometer is connected with signal gathering unit, and signal gathering unit is connected with computer.Imaging system simple structure of the present invention, low cost, small volume, low in energy consumption, stability are high, image taking speed is fast, can effectively detect the dangerous goods hidden on the person.
Description
Technical field
The invention belongs to safety check technical field, it is 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 technology
Concern with people to safety problem increasingly strengthens, and the security, reliability and intellectuality to safe examination system are all
Propose requirement higher.The contraband in luggage, safety check detection energy mainly detect using X-ray safety check instrument in present safety check department
Power is strong, can obtain resolution ratio fluoroscopy images higher, but X-ray ionization is larger to harm, it is impossible to for detecting people
The contraband hidden with it.Even if the X-ray machine of low radiation dose is there is currently, but it is still not easy to be accepted by the public.Such as
It is exactly the X-ray for utilizing low dosage up to so-called its essence of " dim light " human body safety check instrument of production that road is opened in Anhui by domestic security protection company
Safety check imaging is carried out to human body, in April, 2016 starts successively to make in Chengdu east railway station and Chengdu Shuangliu International Airport input
With, but disclose report once associated specialist, it is panic to cause the common people immediately, on October 10th, 2016 by national environmental protection portion with plus
The form of anxious file orders to disable immediately.
Using metal detector, can detect whether there is metal on the person, but the shape of metal can not be detected,
Cannot judge whether it is safe hard goods, such as have metal ingredient in artificial limb, it is also possible to wherein keep gun, metal detection
Device can not distinguish the metal and gun in artificial limb, and metal detector needs detection object to coordinate, and efficiency is too low.
Because the aspects such as the weapon that mm-wave imaging technology is hidden on the detection person have advantageous advantage, so
Mm-wave imaging technology is used for safety check an into study hotspot in recent years.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 is interacted by receiving machine testing and human body
Millimeter wave electromagnetic field afterwards, so as to be imaged to human body.The typical Provision series for having L-3Security companies that represents is produced
Product, the PNNL intelligent scanning mm-wave imaging instrument in U.S. TNNL laboratories and Southwest Microwave companies
INTERPID imagers etc., the advantage of 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 angle scintillations effect etc. is received when being closely imaged to be influenceed, than larger, to be difficult to overcome in imaging
This problem；In addition, what kind of biological effect millimeter-wave radiation can produce on earth to organism, do not come to a conclusion still at present,
So still there is unknown radiation safety for safety check in active millimeter wave imaging technique.
Passive millimeter imaging technology is by detecting that target millimeter-wave radiation capacity volume variance in itself is contrasted into
Picture, it is not necessary to radiation source, is perfectly safe to human body, and the textile such as clothing is 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：
One is phased array imaging technology, and mechanical scanning is replaced using electron scanning.Phased array antenna is by two-dimensional array unit
Composition, each receiving unit is connected with a phase shifter, by controlling the phase and amplitude of receiving unit, realizes antenna beam
The ken.The advantage of the technology is that system bulk is smaller, and image taking speed quickly, can realize real time imagery.But antenna structure is answered
It is miscellaneous, it is more difficult to realize a high-resolution system, study less at present for imaging and passive imaging, still in development.
Two is synthetic aperture imaging technology, and the antenna combination of multiple smaller aperture dues is simulated into one using partially coherent principle
The effect of wide aperture antenna.Such as Japanese NEC Corporation have developed the model machine based on synthetic aperture imaging, German NASA and grind
Ground and airborne Ka wave bands and W-waveband synthetic aperture radiometers image-forming system etc. are made.Program technology relative maturity, but
It is to need multiple receiving unit composition thinned arrays, design cost and hardware cost are still very high.
Three is focal plane array image-forming technology, is generally focused on using parabola antenna or lens antenna, using plurality of cells
Antenna is distributed on focal plane and the multiple spot in multiple target region is imaged simultaneously with the use of reflecting surface structure.It is typical to represent
There are the type products such as Vela125, X250, S350 of Millivision companies of the U.S., the PMMW of Lockheed Martin companies
Focal plane imaging instrument of imager model machine and Northrop Grumman companies 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.
Four is traditional mechanical scanning imaging technique, is the original millimeter-wave radiation imaging mode of comparing.This kind of mode is adopted
With the narrow antenna of beam angle as receiver, scan whole scene by mechanical movement to obtain the image of scene.Example
What single channel scanning imaging system, Ukraine country's superconduction radio research center such as Millivision companies of the U.S. were developed
8mm band imaging systems etc..Common scan mode needs constantly acceleration-deceleration based on rank scanning, in scanning process,
Imaging time is more long, and resolution ratio is relatively low；Or have improved procedure, by the way of electronically scanning at one dimension another dimension mechanical scanning, plus
Speed imaging time, however it is necessary that lining up array using multiple receivers, considerably increases system cost.The advantage of the system
It is that principle is simple, and advantage of lower cost, if improved to some extent on imaging mode, reduces imaging time, need not at some
It is then quite applicable that the occasion of real time imagery carries out human body safety check imaging.
The content of the invention
It is an object of the invention to overcome the shortcomings of that existing passive millimeter wave imaging system is present, there is provided one kind is used for safety check
W-waveband passive millimeter wave imaging system, the system has that image taking speed is fast, high resolution, low cost and other advantages, can be effective
It is quickly detected from the dangerous goods hidden on the person.
The present invention is adopted the following technical scheme that：
A kind of W-waveband passive millimeter wave imaging system for safety check, including W-waveband millimeter wave radiometer, horizontal direction
Rotating disk, scanning platform, Cassegrain antenna, smooth metal reflecting surface, longitudinal support for rotary disc, longitudinal rotating disk and control system,
It is characterized in that：The horizontal direction rotating disk is arranged on scanning platform, and Cassegrain antenna is fixedly installed in horizontal direction and turns
Disk side, smooth metal reflecting surface is fixedly installed in horizontal direction rotating disk opposite side by longitudinal rotating disk and smooth metal reflects
Face and Cassegrain antenna principal reflection mouthful face axle center is relative and angle at 45 ° therewith.
The horizontal direction rotating disk controls uniform rotation by a horizontal step motor, and longitudinal rotating disk passes through one
Longitudinal stepper motor drives smooth metal reflecting surface uniform rotation.
The horizontal direction rotating disk side is additionally provided with a proximity switch catch, two horizontal fiber sensor catch,
The start-stop position rotated for controlled level direction and the effective coverage of horizontal direction visual field.Sweep in wherein proximity switch catch outside
Retouch and be additionally provided with platform corresponding two proximity switches, horizontal direction maximum rotation angle is by two proximity switches and connects
Nearly switch catch control；When shielding plate turns to proximity switch position, horizontal rotating disc is just rotated backward, and so on；Institute
State and be provided with horizontal fiber sensor, every turn of a horizontal rotating disc week on the outside of two horizontal fiber sensor catch on scanning platform
Phase, two horizontal fiber sensor catch sequentially pass through horizontal fiber sensor, respectively produce a start pulse signal, indicate
The effective coverage of horizontal direction visual field, realizes the transversal scanning to target scene.
Longitudinal Fibre Optical Sensor catch is provided with longitudinal rotating disk, longitudinal optical fiber is provided with longitudinal support for rotary disc and is passed
Sensor, with longitudinal rotating disk each rotation, longitudinal Fibre Optical Sensor just obtains a trigger pulse letter to longitudinal Fibre Optical Sensor catch
Number, the beginning of longitudinal direction collection is indicated, further according to realistic objective size by gathering time delay, realize sweeping the longitudinal direction of target scene
Retouch.
The horizontal direction stepper motor and longitudinal stepper motor are by control system control.
The W-waveband radiometer input is connected with the feed of Cassegrain antenna by waveguide and is fixed on Cassegrain
The back side of antenna main reflector, its output end connection control system, exports scanning result.
Further, the control system includes computer, data acquisition unit and PLC control unit, and the data are adopted
The input for collecting unit is connected with the output end of W-waveband millimeter wave radiometer, and data acquisition is carried out to radiometer output signal；Number
Output end according to collecting unit is connected with computer, carries out follow-up data treatment and image recovers；The horizontal direction stepping electricity
The rotation of machine and longitudinal stepper motor is by PLC control unit control.
Further, 45 ° of the horizontal direction rotating disk maximum rotation angle, longitudinal rotating disk is 360 ° of uniform rotation,
Longitudinal imaging viewing field can be adjusted flexibly according to realistic objective size by the interval that control data is gathered.
Further, the W-waveband millimeter wave radiometer includes millimeter wave low-noise amplifier LNA concatenation units, detection
Device unit, video amplifier unit；The millimeter wave energy of observation scene radiation is by smooth metal reflective surface to jam lattice
Received by feed after human relations antenna line focus, the millimeter-wave signal for receiving is sent to W-waveband millimeter amplitude by feed by waveguide
Meter is penetrated, is amplified by the amplification of LNA concatenation units, detection unit detection, and video amplification unit, output is radiated with observation scene
The linear voltage signal of millimeter wave energy.
Further, there is the flabellum cutting antenna beam at the uniform velocity rotating before the Cassegrain antenna feed, pasted on flabellum
Absorbing material is applied, wave beam is constantly switched between observation scene and flabellum, make radiometer output AC voltage signal, at the uniform velocity revolved
The fan for turning plays a part of applied mechanical modulation, and the rotating speed of flabellum namely the frequency of modulation are always positioned at video amplifier unit
Passband in.
Specifically, system controls two stepper motors to drive level during scanning imagery by PLC control unit
Rotating disk and longitudinal rotating disk are rotated simultaneously according to the rotating speed for setting, and the horizontal and vertical of target scene is scanned respectively.
Two horizontal fiber sensor catch sequentially pass through the pulse signal that horizontal fiber sensor is produced in horizontal rotating disc rotation process
Control to a width complete object scene image data collection beginning and end (two horizontal fiber sensor catch are corresponding
Angle of circumference angle of circumference corresponding less than two proximity switches).Horizontal fiber sensor-triggered first time pulse signal, indicates right
Target scene scans the beginning with data acquisition, and the collection of each column data then passes through metal mirror rotation process in image
The pulse signal that middle longitudinal Fibre Optical Sensor is produced enters line delay collection and realizes, makes data acquisition unit just in metal mirror
Scan the output voltage signal during target scene to radiometer to be acquired, i.e. metal mirror every revolution, number
A row pixel data of correspondence position in target scene is only gathered according to collecting unit.After each column data acquisition terminates, under wait
Once longitudinal Fibre Optical Sensor trigger pulse arrives, then carries out the collection of next column data, until horizontal fiber sensor second
Secondary trigger pulse arrives and 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 reflexes to Cassegrain antenna, and feed is focused on by Cassegrain antenna,
The millimeter wave energy that the radiometer being connected with feed can just be come in each beam direction radiation of received field scape.Radiometer is exported
Voltage signal is finally delivered to computer and carries out data processing and image recovery through data acquisition unit collection.
The invention also discloses the imaging method of above-mentioned imaging system：Metal mirror along axle center uniform rotation, with one
Rise the optical fiber shielding plate for rotating often by Fibre Optical Sensor once, data acquisition unit just starts to carry out data to target scene to adopt
Collection, metal mirror leaves target scene and stops collection, and when next time, longitudinal Fibre Optical Sensor produces trigger pulse, level
Rotating disk just has turned through the deviation angle in a horizontal direction, then starts the data acquisition of next column, until view picture scene number
Completed according to collection；Amplitude according to collection signal is converted into the gray value or pseudo-colours value of pixel, and millimeter is made on computers
Ripple image.
The beneficial effects of the present invention are：W-waveband passive millimeter wave imaging system for safety check proposed by the present invention and
Its imaging method, using W-waveband direct detection formula millimeter wave radiometer, it is not necessary to which local oscillator, small volume is low in energy consumption；With flabellum
On close to absorbing material fan cut wave beam, amplify produce AC signal, eliminate dc noise；In addition to take into account being
System cost and imaging time, employ spiral scan pattern, it is only necessary to two-dimentional machinery uniform rotation, unlike in translation scanning process
Need to accelerate repeatedly, slow down, be conducive to mechanical stability, and sweep speed is faster.The system simple structure, stability is high,
The dangerous goods hidden on the person can effectively be detected.
Brief description of the drawings
Fig. 1 is the overall structure block diagram of the embodiment of the present invention.
Fig. 2 is the schematic side view of embodiment of the present invention scanning platform.
Fig. 3 is the schematic top plan view of embodiment of the present invention scanning platform.
Fig. 4 is W-waveband millimeter wave radiometer structural representation 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.
Accompanying drawing 1,2,3 is referred to, present invention is disclosed a kind of W-waveband passive millimeter wave imaging system for safety check, institute
State system including smooth metal reflecting surface (1), the Cassegrain antenna (2) of 300mm bores, W-waveband millimeter wave radiometer (3),
Longitudinal rotating disk (4), the Fibre Optical Sensor (5-1) being fixed on scanning platform, horizontal direction rotating disk (6), two proximity switch (8-
1st, 8-2), data acquisition unit (9), computer (10).Wherein described smooth metal reflecting surface (1) and longitudinal Fibre Optical Sensor gear
Piece (7-4) is fixed on longitudinal rotating disk (4)；The W-waveband radiometer (3) is connected and consolidates with the feed of Cassegrain antenna (2)
It is scheduled on Cassegrain antenna primary reflection surface；Longitudinal rotating disk (4), Cassegrain antenna (2), two horizontal fiber sensors
Catch (7-1,7-2) and proximity switch catch (7-3) are each attached on horizontal direction rotating disk (6), wherein longitudinal rotating disk (4) and card
Cassegrain antenna (2) is the offside for being coaxially fixed on horizontal rotating disc；The metal mirror (1) is fixed on longitudinal direction and turns with 45° angle
On disk (4), its center is alignd with cassette antenna feed；The output interface of the W-waveband millimeter wave radiometer (3) and data acquisition
Unit (9) is connected；The output end of the data acquisition unit (9) is connected with computer (10) carries out data processing and image is extensive
It is multiple.
The millimeter wave energy that the radiation of observation scene all directions comes is reflexed to jam lattice by the smooth metal reflecting surface (1)
The primary reflection surface of human relations antenna (2), feed is focused on by Cassegrain antenna (2), and the radiometer (3) being connected with feed can
To receive the millimeter wave energy that scene each beam direction radiation is come in.
As shown in figure 4, the W-waveband millimeter wave radiometer by LNA concatenation units 1 (3-1), LNA concatenation units 2 (3-2),
Pick-up unit (3-3), video amplifier unit (3-4) composition, wherein the Cassegrain antenna feed is cascaded with the LNA
Unit 1 (3-1) is connected, and the LNA concatenation units 1 (3-1) are connected with the LNA concatenation units 2 (3-2), the LNA grades of receipts or other documents in duplicate
2 (3-2) of unit 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.After the millimeter-wave radiation energy of observation scene is converged through Cassegrain antenna (2), by LNA concatenation units (3-1,3-
2) amplification, pick-up unit (3-3) detection, and video amplifier unit (3-4) amplify, the milli that output is radiated with observation scene
The linear voltage signal of metric wave energy.
There is the flabellum cutting antenna beam at the uniform velocity rotating before Cassegrain antenna (2) feed, suction ripple is sticked on flabellum
Material, makes wave beam constantly switch between observation scene and flabellum, feed is received ac voltage signal, and its frequency is located at video
In amplifying unit passband, alternative radiometer is constituted, compared with DC radiometer, alternative radiometer only amplifies scene and inhales ripple material
Difference between material, eliminates dc noise.
During scanning imagery, two stepper motors are controlled to drive horizontal rotating discs and longitudinal rotating disk according to setting by PLC
The rotating speed set is rotated simultaneously, and the horizontal and vertical of target scene is scanned respectively.Horizontal direction rotating disk (6) is by a water
Flat step motor control, the rotation maximum angle of horizontal direction is connect by the proximity switch catch (7-3) on horizontal rotating disc and two
Nearly switch (8-1,8-2) control, horizontal rotating disc average rate is rotated, whenever proximity switch catch (7-3) turns to proximity 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 rotating disk (6) rotation process two horizontal fiber sensors catch (7-1,7-2) according to
It is secondary successively to produce two pulse signals by horizontal fiber sensor (5-1), control a width complete object scene image data
Collection beginning and end (the corresponding angle of circumference of horizontal fiber sensor catch (7-1,7-2) less than two proximity switches (8-1,
8-2) corresponding angle of circumference), and the collection of each column data is then by longitudinal light in metal mirror (1) rotation process in image
The pulse signal that fiber sensor catch (7-4) is produced by longitudinal Fibre Optical Sensor (5-2) every time, enters line delay collection and realizes,
Enter output voltage signal of the data acquisition unit just to radiometer during metallic reflection Surface scan to target scene
Row collection, i.e. metal mirror every revolution, data acquisition unit only gather a column data of correspondence position in target scene.Such as
Fig. 5 show scanning track schematic diagram of the scanning platform to objective plane, where the dotted line signifies that objective plane is scanned and
The track of data acquisition.Such as, two horizontal fiber sensors catch (7-1,7-2) sequentially pass through horizontal fiber sensor (5-
1) time interval is 5s, and the width of correspondence front 3m distant object scenes is 1m, and the rotating speed of metal mirror is 8r/s, is adopted
The data of truck each column collection are 100, and the height of correspondence front 3m distant object scenes is 2m, then complete single pass just
40 column datas are obtained, per column data 100, this 40*100 data is to front 3m distant places width 1m 2m target scenes high
Imaging data.
Final being transferred to of data that data acquisition unit is collected carries out signal transacting to computer, obtains millimeter wave figure
Picture.The Preliminary Results that imaging is scanned to the target body for carrying metal gun are illustrated in figure 6, are illustrated in figure 7 to taking
Target body with sintex is scanned the Preliminary Results of imaging, is illustrated in figure 8 the mesh to carrying I-shaped object
Mark human body is scanned the Preliminary Results of imaging.
Image-forming principle of the invention is as follows：
Temperature can be from shooting radiated electromagnetic wave, the electromagnetic wave energy distribution of radiation higher than the object of absolute zero in nature
In wide wave frequency scope in, wherein near millimeter-wave frequency f with a width of B in the range of, object per surface
The millimeter wave power size of product itself radiation can be drawn by planck formula：
Wherein phy symbol implication is：
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, and total millimeter wave energy of object radiation is usual
The resulting radiation temperature T of object can be usedETo weigh：
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
Rate, reflectivity are different with transmissivity because transmitting is hit for the object of unlike material, and different resulting radiation temperatures are presented.
Such as metal is substantially that (human body absorbs millimeter wave (ε=0.5~0.9, ρ to reflection environment irradiation temperature mostly for ε=0, ρ=1)<
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, and the voltage of output is：
Vd=CGRF(Ps+Prn) (3)
Wherein, GRFIt is LNA concatenation unit gains, C (V/W) is detection tube sensitivity, PsFor the millimeter wave that radiometer is received
Signal power, PrnIt is radiometer noise power in itself.
The course of work of the invention is as follows：The system according to the pattern to be scanned by PLC controlled levels rotating disk (6) and
The rotating speed and sweep limits of longitudinal rotating disk (4), while flabellum rotates cutting wave beam, millimeter wave radiometer (3) produces exchange video
Signal.One is produced when first shielding plate (7-1 or 7-2) on horizontal rotating disc (6) is by horizontal fiber sensor (5-1) to touch
Hair pulse, system starts to be scanned a width complete object scene, smooth metal reflecting surface (1) every revolution, the light of longitudinal direction
Fine shielding plate (7-4) all can produce a triggering arteries and veins in the fixed position for setting in advance by longitudinal Fibre Optical Sensor (5-2)
Punching, notify data acquisition unit (9) start gather this row data, acquisition time by target scene distance and high computational
Determine, metal mirror (1) leaves target scene and stops collection, when longitudinal Fibre Optical Sensor (5-2) generation next time
Trigger pulse arrives and 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) produces trigger pulse.Due to horizontal rotating disc and vertical
All it is uniform rotation to rotating disk, so the every column data for collecting correspond to highly equal, alignment arrangement and phase in target scene
Mutual parallel rows of pixels.The vision signal of collection carries out the data processings such as denoising, sharpening in a computer, and its amplitude turns
Change gray scale or pseudo-colours into, so just obtain the corresponding millimeter-wave image of target scene.
The present invention is described above for the composition and image-forming principle of the millimeter wave imaging system of safety check, the present invention is being disclosed
While said system, the imaging method of said system is also disclosed；The method comprises the following steps：Metal mirror is even along axle center
Speed rotate, the optical fiber shielding plate for rotating therewith often by Fibre Optical Sensor once, data acquisition unit just starts to target
Scene carries out data acquisition, and metal mirror leaves target scene and stops collection, and when next time, longitudinal Fibre Optical Sensor is produced
Raw trigger pulse, horizontal rotating disc just has turned through the deviation angle in a horizontal direction, then starts the data acquisition of next column,
Until view picture contextual data is gathered completing；Amplitude according to collection signal is converted into the gray value or pseudo-colours value of pixel, in meter
Millimeter-wave image is made on calculation machine.
In sum, W-waveband passive millimeter wave imaging system proposed by the present invention and its imaging method, using direct detection
Formula millimeter wave radiometer, it is not necessary to local oscillator, small volume is low in energy consumption；Wave beam is cut with the fan on flabellum close to absorbing material,
Amplify the AC signal for producing, eliminate direct current and make an uproar field；In addition to taking into account system cost and imaging time, employ spiral and sweep
Mode is retouched, i.e., two-dimensional scan is carried out by level and the rotating disk uniform rotation simultaneously of longitudinal direction two, wherein longitudinal rotating disk and cassette day
Line be it is concentric be fixed on horizontal rotating disc together, Cassegrain antenna receives the reflection of longitudinal rotating disk Smooth metallic plate
The millimeter-wave radiation energy of target scene, passes to millimeter wave radiometer, carries out single channel imaging.The system clever structure, surely
Qualitative height, image taking speed is fast, can effectively detect the dangerous goods hidden on the person.
Here description of the invention and application are illustrative, are not wishing to limit the scope of the invention to above-described embodiment
In.The deformation and change of embodiments disclosed herein are possible, real for those skilled in the art
The replacement and equivalent various parts for applying example are 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 of, the present invention can in other forms, structure, arrangement, ratio, and with other components,
Material and part are realized.In the case where scope and spirit of the present invention are not departed from, embodiments disclosed herein can be entered
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 rotating disk and control system, its
It is characterised by：The horizontal direction rotating disk is arranged on scanning platform, and Cassegrain antenna is fixedly installed in horizontal direction rotating disk
Side, smooth metal reflecting surface is fixedly installed in horizontal direction rotating disk opposite side and smooth metal reflecting surface by longitudinal rotating disk
And therewith at 45 ° angle relative with Cassegrain antenna principal reflection mouthful face axle center；
The horizontal direction rotating disk controls uniform rotation by a horizontal step motor, and longitudinal rotating disk passes through a longitudinal direction
Stepper motor drives smooth metal reflecting surface uniform rotation；
The horizontal direction rotating disk side is additionally provided with a proximity switch catch, two horizontal fiber sensor catch, is used for
Start-stop position and the effective coverage of horizontal direction visual field that controlled level direction rotates；Wherein proximity switch catch outside scanning is flat
Corresponding two proximity switches are provided with platform, the maximum rotation angle of horizontal direction is by two proximity switches and proximity switch
Catch is controlled；When shielding plate turns to proximity switch position, horizontal rotating disc is just rotated backward, and so on；It is described two
Horizontal fiber sensor is provided with the outside of horizontal fiber sensor catch on scanning platform, horizontal rotating disc is every to turn a cycle, two
Individual horizontal fiber sensor catch sequentially passes through horizontal fiber sensor, respectively produces a start pulse signal, indicates level
The effective coverage of direction visual field, realizes the transversal scanning to target scene；
Longitudinal Fibre Optical Sensor catch is provided with longitudinal rotating disk, longitudinal Fibre Optical Sensor is provided with longitudinal support for rotary disc
Device, with longitudinal rotating disk each rotation, longitudinal Fibre Optical Sensor just obtains a start pulse signal to longitudinal Fibre Optical Sensor catch,
The beginning of longitudinal direction collection is indicated, further according to realistic objective size by gathering time delay, the longitudinal scanning to target scene is realized.
2. a kind of W-waveband passive millimeter wave imaging system for safety check as claimed in claim 1, it is characterised in that：It is described
Horizontal direction stepper motor and longitudinal stepper motor are by control system control.
3. a kind of W-waveband passive millimeter wave imaging system for safety check as claimed in claim 1, it is characterised in that：It is described
There is the flabellum cutting antenna beam at the uniform velocity rotating before Cassegrain antenna feed, deposited absorbing material is posted on flabellum, make wave beam not
Break and switch 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 claimed in claim 1, it is characterised in that：The W
Wave band radiometer input is connected with the feed of Cassegrain antenna by waveguide and is fixed on Cassegrain antenna primary reflection surface
The back side, its output end connection 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, input and the W ripples of the data acquisition unit
The output end connection of section millimeter wave radiometer, data acquisition is carried out to radiometer output signal；The output end of data acquisition unit
It is connected with computer, carries out follow-up data treatment and image recovers；The horizontal direction stepper motor and longitudinal stepper motor
Rotate by PLC control unit control.
6. a kind of W-waveband passive millimeter wave imaging system for safety check as claimed in claim 1, it is characterised in that：It is described
45 ° of horizontal direction rotating disk maximum rotation angle, longitudinal rotating disk 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 units, pick-up unit, video amplifier list
Unit；Observation scene radiation millimeter wave energy by after smooth metal reflective surface to Cassegrain antenna line focus by feed
Receive, the millimeter-wave signal for receiving is sent to W-waveband millimeter wave radiometer by feed by waveguide, by LNA concatenation units
Amplification, detection unit detection, and video amplification unit amplify, the linear pass of millimeter wave energy that output is radiated with observation scene
The voltage signal of system.
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