The passive portable Terahertz safety check instrument of 220GHz masterTechnical field
The present invention relates to the passive portable Terahertz safety check instrument of safety check instrument technical field more particularly to a kind of 220GHz master.
Background technique
THz wave refers to electromagnetic wave of the frequency within the scope of 100GHz-10THz, high-end, the submillimeter wave with millimeter waveAnd far infrared is overlapped, in macroelectronics to the excessive field of microcosmic photonics.THz wave is in electromagnetic spectrumOccupy very special position.Terahertz is a kind of radiation source that is new, having many particular advantages；Terahertz Technology be one veryImportant intersection Disciplinary Frontiers provide a very tempting opportunity to technological innovation, the national economic development and national security.THz wave naturally has to nonmetallic and apolar substance penetrability, is highly suitable for detecting human body, detects human skinAnd the various dangerous material hidden among clothes.THz wave has human safety simultaneously, this is because the light of THz waveSub- energy is very small, not will cause the injury of ionization property to human body cell, is safe to human body.Compared to the microwave and millimeter wave of low frequencyFrequency range, THz wave wavelength is shorter, hereby has high-resolution characteristic.Many substances have fingerprint spectral property in terahertz wave band,Similar to the fingerprint of people, substance non-damage drive and detection can be applied to.In the numerous applications of Terahertz, ceased at present with human livesCeasing relevant is exactly Terahertz safety check technology.Terahertz human body safety check technology be using THz wave to ordinary clothing material (cotton,Fiber crops, chemical fibre etc.) special penetrability, the blank in human body safety check field has been filled up, has been the important benefit to current human's safety check meansIt fills.
Currently used safety detection means are metal detection door and X-ray machine, and metal detections can not be detected effectively except goldContraband outside category, typical dangerous material can not visited (sintex, free-flowing dynamite, liquid explosives, gasoline, diesel kerosene), elicitedOut be not dangerous material (mobile phone, steel Beng, key, metal toiletry), X-ray, can be thin to human body since its photon energy is too bigBorn of the same parents cause the injury of ionization property, and human body harmfulness is very big.America and Europe has disabled at present.Therefore Terahertz safety check has very big potential marketValue.
The safe examination system of THz wave is broadly divided into two major classes at present, and one kind is passive type safe examination system, and one kind is activelyFormula safe examination system.Passive type safety check feature: first is that it is non-contact, without searching the person, respect tested personnel's individual privacy；Second is that detection effectRate is high, and speed is fast, without stop, and tested personnel normal walking in specified security check passage is mentioned significantly by that can complete safety checkHigh safety check efficiency；Third is that safety is radiationless, similar ordinary camera, monitoring camera do not generate electromagnetism, ionising radiation, to peopleBody is harmless.The disadvantage is that resolution ratio is not high, signal-to-noise ratio is not high.Active safe examination system is the milli by actively emitting dosesMetric wave/THz wave (can receive in range of doses), human body be imaged, for passive type safety check instrument, signal-to-noise ratio is higher.Though there is certain dose of radiation, since millimeter wave/Terahertz photon energy is small, ionization property wound will not be caused to human body cellEvil.Currently used active system is mostly to be worked based on room temperature microelectronic component, is unable to real time imagery, needs 3 to 5 secondsIt could be imaged.
Safe examination system on the market or belong to passive type system at present or belong to active imaging system, due to twoKind system system respectively has advantage and disadvantage, if the advantages of proactive system and passive type system combined, may be implemented quicklyPercent of pass and the actively purpose of fine screening.
Under some specific application scenarios, such as fly after Passenger On Board ascends the throne, crew can be to the row on aircraftLee carries out single pass again, to determine that the dangerous material that will affect flight safety are next to checking, in this case, on the marketThe rays safety detection apparatus of some large sizes will be no longer suitable, it is therefore desirable to miniaturized and portable rays safety detection apparatus.
Summary of the invention
The technical problem to be solved by the present invention is to how provide a kind of can not only work in active state but also can be with workMake in passive type state, it can the passive portable Terahertz safety check instrument of fast imaging and the high 220GHz master of imaging precision.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of 220GHz master it is passive it is portable tooHertz safety check instrument, including safety check instrument ontology, it is characterised in that: the safety check instrument ontology includes shell and to be located at shell intracorporal severalA 200GHz-240GHz wave receiving unit, several 200GHz-240GHz wave transmitting units, intermediate frequency processor, computer generated imageUnit, image processing unit and alarm output module, the 200GHz-240GHz wave receiving unit, intermediate frequency processor, computerImaging unit, image processing unit and alarm output module constitute passive type active link；200GHz-240GHz wave receives singleMember, several 200GHz-240GHz wave transmitting unit, intermediate frequency processor, computer generated image unit, image processing unit and reportsAlert output module constitutes active active link；The letter of the 200GHz-240GHz wave receiving unit and the intermediate frequency processorThe connection of number input terminal, the terahertz emission signal issued for receiving human body or object；The intermediate frequency processor and the calculatingThe signal input part of machine imaging unit connects, for handling the terahertz emission signal received；The computer atAs unit is connect with the signal input part of described image processing unit, to intermediate frequency processor treated signalReason, obtains corresponding image information；The signal output end of described image processing unit and the signal of the pattern recognition module are defeatedEnter end connection, described image processing unit obtains people for handling the image obtained after computer generated image cell processingThe image of body or object；The signal output end of described image recognition unit and the signal input part of the alarm output module connectIt connects, whether described image identification module identifies in image for carrying out processing to the image for obtaining human body or object with separatedProhibited cargo product；The alarm output module prompts discovery prohibited items for issuing alarm signal；
When work, the Terahertz safety check instrument is worked first in passive work mode, receives human body by passive type active linkOr the terahertz emission that object issues, preliminary screening is carried out to human body or object, when preliminary screening goes out suspicious object, controlThe Terahertz safety check instrument is switched to active work mode, is emitted by the 200GHz-240GHz wave in active active linkThen unit receives target by 200GHz-240GHz wave receiving unit and reflects to the electromagnetic wave of objective emission 220GHzElectromagnetic wave, while increasing imaging resolution to target carry out image procossing, identify prohibited items.
A further technical solution lies in: the 200GHz-240GHz wave receiving unit includes 200GHz-240GHz loudspeakerAntenna, low-noise amplifier sub-harmonic mixer and intermediate frequency wave detector, the signal output of the 200GHz-240GHz electromagnetic hornEnd is connect with the signal input part of the sub-harmonic mixer, the signal output end of the sub-harmonic mixer and the low noiseThe signal input part of amplifier connects, and the signal of the signal output end of the low-noise amplifier and the intermediate frequency wave detector inputsEnd connection, the signal output end of the intermediate frequency wave detector are the signal output end of the receiving unit；200GHz-240GHz loudspeakerAntenna receives terahertz emission that human body or object issue or reflection, then by the sub-harmonic mixer by human body orThe faint radiation signal of person's object mixes down to easy-to-handle IF frequency, using intermediate frequency low-noise amplifier and intermediate frequency detectionIntermediate-freuqncy signal is changed into voltage signal by device, and voltage signal is sent into computer terminal display after data acquire, aobvious in computerShow that terminal forms the terahertz image of testee.
A further technical solution lies in: the 200GHz-240GHz wave receiving unit is provided with 12 rows 4 column total 48A, the 200GHz-240GHz wave transmitting unit is provided with 12, is respectively arranged at 200GHz-240GHz wave described in every two rowTwo sides position between receiving unit.
A further technical solution lies in: the working frequency of the safety check instrument is 220GHz, and bandwidth of operation is 200 GHz-240GHz。
The beneficial effects of adopting the technical scheme are that herein described safety check instrument can work and connect in passive typeReceipts state can also work in active state；When passive type works, imaging rate is fast, and 12 frame per second, imaging precision is lower, pointResolution is 2cm；When active work, imaging rate is slow, about needs 1 second, and imaging precision is high, resolution ratio 2mm.Equipment is simply smallIngeniously, hand-holdable formula works and battery power supply can be used；The safety check instrument is by being arranged corresponding operating mode, it can be achieved that by starting buildingThe switching of operation mode and active work mode, and then be not only able to achieve fast imaging but also be able to achieve imaging precision height.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the structural schematic diagram of safety check instrument described in the embodiment of the present invention；
Fig. 2 is the position view of receiving channel and transmission channel in safety check instrument described in the embodiment of the present invention；
Fig. 3 is the functional block diagram of passive type active link in safety check instrument described in the embodiment of the present invention；
Fig. 4 is the functional block diagram of active active link in safety check instrument described in the embodiment of the present invention；
Wherein: 1, safety check instrument ontology；2,200GHz-240GHz wave receiving unit；3,200GHz-240GHz wave transmitting unit.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, completeGround description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.It is based onEmbodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every otherEmbodiment shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, but the present invention can be withImplemented using other than the one described here other way, those skilled in the art can be without prejudice to intension of the present inventionIn the case of do similar popularization, therefore the present invention is not limited by the specific embodiments disclosed below.
As shown in Figure 1, the embodiment of the invention discloses a kind of 220GHz master passively portable Terahertz safety check instrument, including peaceInstrument ontology 1 is examined, the safety check instrument ontology 1 is including shell and is located at several intracorporal 200GHz-240GHz wave receiving units of shell2, several 200GHz-240GHz wave transmitting unit 3, intermediate frequency processor, computer generated image unit, image processing unit and alarmsOutput module.As shown in figure 3, the 200GHz-240GHz wave receiving unit 2, intermediate frequency processor, computer generated image unit, figureAs processing unit and alarm output module constitute passive type active link；As shown in figure 4,200GHz-240GHz wave receives listMember 2, several 200GHz-240GHz wave transmitting units 3, intermediate frequency processor, computer generated image unit, image processing unit andAlarm output module constitutes active active link；The 200GHz-240GHz wave receiving unit 2 and the intermediate frequency processorSignal input part connection, the terahertz emission signal issued for receiving human body or object；The intermediate frequency processor and the meterThe signal input part of calculation machine imaging unit connects, for handling the terahertz emission signal received；The computerImaging unit is connect with the signal input part of described image processing unit, to intermediate frequency processor treated signalReason, obtains corresponding image information；The signal output end of described image processing unit and the signal of the pattern recognition module are defeatedEnter end connection, described image processing unit obtains people for handling the image obtained after computer generated image cell processingThe image of body or object；The signal output end of described image recognition unit and the signal input part of the alarm output module connectIt connects, whether described image identification module identifies in image for carrying out processing to the image for obtaining human body or object with separatedProhibited cargo product；The alarm output module prompts discovery prohibited items for issuing alarm signal；
When work, the Terahertz safety check instrument is worked first in passive work mode, receives human body by passive type active linkOr the terahertz emission that object issues, preliminary screening is carried out to human body or object, when preliminary screening goes out suspicious object, controlThe Terahertz safety check instrument is switched to active work mode, is emitted by the 200GHz-240GHz wave in active active linkThen unit receives target by 200GHz-240GHz wave receiving unit and reflects to the electromagnetic wave of objective emission 220GHzElectromagnetic wave, while increasing imaging resolution to target carry out image procossing, identify prohibited items.
Further, as shown in figure 3, the 200GHz-240GHz wave receiving unit 3 includes 200GHz-240GHz loudspeakerAntenna, low-noise amplifier sub-harmonic mixer and intermediate frequency wave detector, the signal output of the 200GHz-240GHz electromagnetic hornEnd is connect with the signal input part of the sub-harmonic mixer, the signal output end of the sub-harmonic mixer and the low noiseThe signal input part of amplifier connects, and the signal of the signal output end of the low-noise amplifier and the intermediate frequency wave detector inputsEnd connection, the signal output end of the intermediate frequency wave detector are the signal output end of the receiving unit；200GHz-240GHz loudspeakerAntenna receives terahertz emission that human body or object issue or reflection, then by the sub-harmonic mixer by human body orThe faint radiation signal of person's object mixes down to easy-to-handle IF frequency, using intermediate frequency low-noise amplifier and intermediate frequency detectionIntermediate-freuqncy signal is changed into voltage signal by device, and voltage signal is sent into computer terminal display after data acquire, aobvious in computerShow that terminal forms the terahertz image of testee.
As shown in Fig. 2, the 200GHz-240GHz wave receiving unit 2 is provided with total 48 of 12 rows 4 column, it is described200GHz-240GHz wave transmitting unit 3 is provided with 12, is respectively arranged at 200GHz-240GHz wave described in every two row and receives listTwo sides position between member.The working frequency of the safety check instrument is 220GHz, and bandwidth of operation is 200 GHz -240GHz.
The safety check instrument working frequency is 220GHz wave band, i.e. 200-240GHz frequency range.It can work in passive and activeTwo ways.It when detecting dangerous material, is worked first in passive type working condition, imaging rate is fast at this time, can achieveThe extremely above imaging rate of 12 frame per second.When detecting doubtful dangerous material, using active operating mode, at this time to doubtfulObject emits the electromagnetic wave of 220GHz, receives the reflected electromagnetic wave of target object using the receiving module of passive type, increasesAdd imaging resolution, is imaged at this time relatively slowly, but resolution ratio is more preferably.
Further, when first using passive type operating mode, as shown in figure 3, receiving the terahertz that human body or object issueIt hereby radiates, corresponding device work is that electromagnetic horn adds the sub-harmonic mixer of the frequency range, by sub-harmonic mixer by human bodyOr the faint radiation signal of object mixes down to easy-to-handle IF frequency, using intermediate frequency low-noise amplifier and wave detector,Intermediate-freuqncy signal is changed into electric signal, voltage signal is sent into computer terminal display after data acquire, and shows eventually in computerEnd forms the terahertz image of testee.When due to passive work mode, resolution ratio 2cm tentatively can only be screened quickly,When tentatively filtering out suspicious object, controls the safety check instrument and open active working condition, as shown in Fig. 4, at this time to meshThe electromagnetic wave of object emission 200-240GHz is marked, power need to be not less than 1mW, and generally 10mW or so can be realized and arrive 30The distance of 50cm, which is realized, detects the fine resolution of target object.Imaging time about 1 second, due to being emitted using active, at this timeSignal-to-noise ratio is significantly increased, resolution ratio can reach 2 millimeters at this time, and finer imaging helps preferably to confirm contraband.
To sum up, the safety check instrument is by being arranged corresponding operating mode, it can be achieved that passive work mode and active mouldThe switching of formula, and then be not only able to achieve fast imaging but also be able to achieve imaging precision height.