CN209296953U - Millimeter wave/THz wave imaging device - Google Patents
Millimeter wave/THz wave imaging device Download PDFInfo
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- CN209296953U CN209296953U CN201822275968.1U CN201822275968U CN209296953U CN 209296953 U CN209296953 U CN 209296953U CN 201822275968 U CN201822275968 U CN 201822275968U CN 209296953 U CN209296953 U CN 209296953U
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Abstract
The disclosure provides a kind of millimeter wave/THz wave imaging device, including quasi-optics component and millimeter wave/terahertz wave detector array, wherein quasi-optics component is suitable for reflecting checked object spontaneous radiation or reflected millimeter wave/THz wave and converging to wherein millimeter wave/terahertz wave detector array, wherein quasi-optics component includes multiedge cylinder tilting mirror and shaft, wherein multiedge cylinder tilting mirror can be rotated around wherein shaft, wherein shaft and the angle of wherein horizontal plane are 30 ° to 60 °, wherein each side of multiedge cylinder tilting mirror is respectively arranged with reflecting plate, and multiple wherein reflecting plates and wherein the angle between shaft is different.The millimeter wave/THz wave imaging device, by driving multiedge cylinder tilting mirror to rotate around the shaft, to drive multiple reflecting plates while rotate, it is scanned with the horizontal direction to visual field, since the angle of multiple reflecting plates and shaft is different, it so as to realize pixel value difference, therefore can reduce the number of detector, and control simple.
Description
Technical field
This disclosure relates to safety check technical field, more particularly to a kind of millimeter wave/THz wave imaging device.
Background technique
Under the increasingly serious situation of current anti-probably situation both at home and abroad, terrorist carries knife in the way of concealment
The dangerous goods such as tool, gun, explosive constitute serious threat to public safety.Based on passive millimeter wave/THz wave
Human body safety check technology, have the advantages that uniqueness, by detect target itself millimeter wave/terahertz radiation realize imaging,
It is radiated without active, safety check is carried out to human body, the inspection for concealing danger is realized using millimeter wave/THz wave penetration capacity
It surveys.According to the difference of imaging system, passive millimeter wave and THz wave imaging technique can be divided into focal plane imaging system and
Imaging system based on mechanical scanning.
Millimeter wave terahertz camera based on focal plane imaging technology is using complicated technology and needs special device,
The basic principle is that the difference of plurality of cells antenna and reflecting mirror appropriate, lens by being distributed on focal plane to target
Position is imaged simultaneously.Such as the NGC system of Northrop Grumman company, the U.S., reality may be implemented using focal plane array array antenna
When be imaged, but system complex, such as NGC system is at 15 ° of level, the angular resolution that vertical 10 ° of visual field resolution ratio is 0.5 °,
Need 1040 detectors.It can be seen that detector quantity needed for the imaging system is huge, cost is very high.
Utility model content
The purpose of the disclosure aims to solve the problem that at least one aspect of the above-mentioned problems in the prior art and defect.
According to the embodiment of disclosure one aspect, a kind of millimeter wave/THz wave imaging device is provided, comprising: quasi-
Optical module and millimeter wave/terahertz wave detector array, the quasi-optics component be suitable for checked object spontaneous radiation or
Reflected millimeter wave/THz wave reflects and converges to the millimeter wave/terahertz wave detector array, wherein described
Quasi-optics component includes multiedge cylinder tilting mirror and condenser lens, the angle between the shaft and horizontal plane of the multiedge cylinder tilting mirror
Be 30 ° to 60 °, each side of the multiedge cylinder tilting mirror is respectively arranged with reflecting plate, and multiple reflecting plates with it is described
Angle between shaft is different, so that when the multiedge cylinder tilting mirror is rotated around the shaft, multiple reflections
Plate successively to the checked object be located at visual field different level position part spontaneous radiation or reflected millimeter wave/
THz wave is reflected.
In some embodiments, the condenser lens is arranged between checked object and the multiedge cylinder tilting mirror or is arranged
Between the multiedge cylinder tilting mirror and the millimeter wave/terahertz wave detector array.
In some embodiments, the quantity of the reflecting plate of the multiedge cylinder tilting mirror is m, wherein m >=3, m
Angle between the reflecting plate and the shaft with the incremental increase of α or is successively decreased along the direction of rotation, and wherein d is by following
Equation calculates:
In formula, λ is the wavelength of the millimeter wave/THz wave,
D is the diameter of the condenser lens.
In some embodiments, when m is odd number, along the 1st reflecting plate of direction of rotation and institute in the m reflecting plates
Stating the angle between shaft is 0 °, theAngle between a reflecting plate and the shaft isThe
Angle between a reflecting plate and the shaft is
In some embodiments, when m is even number, along the 1st reflecting plate of direction of rotation and institute in the m reflecting plates
The angle stated between shaft isTheAngle between a reflecting plate and the shaft isTheIt is a
Angle between the reflecting plate and the shaft is
In some embodiments, the shaft and the angle of the horizontal plane are 45 °.
In some embodiments, the millimeter wave/THz wave imaging device further includes driving device, and the driving device is suitable
For driving the multiedge cylinder tilting mirror to rotate around the shaft.
In some embodiments, 6 >=m.
In some embodiments, multiple millimeter waves in the millimeter wave/terahertz wave detector array/THz wave is visited
Device is surveyed linearly to be distributed.
In some embodiments, the millimeter wave/THz wave imaging device further include:
Data processing equipment, the data processing equipment are connect with the millimeter wave/terahertz wave detector array to connect
It receives and for the scan data of checked object and generates millimeter wave/terahertz from the millimeter wave/terahertz wave detector array
Hereby wave image；With
Display device, the display device are connected with the data processing equipment, for receiving and showing from data
The millimeter wave of processing unit/THz wave image.
In some embodiments, the millimeter wave/THz wave imaging device further includes calibration source, and the calibration source is described
On the object plane of quasi-optics component, the data processing equipment is received from the millimeter wave/terahertz wave detector array pair
In the calibration data of the calibration source, and based on the received calibration data update the image data of the checked object.
In some embodiments, the length direction of the calibration source is parallel to the shaft of the reflecting plate, the calibration source
Length be more than or equal to the millimeter wave/terahertz wave detector array it is big in the visual field being parallel on the horizontal axis direction
It is small.
In some embodiments, the calibration source is absorbing material, black matrix or semiconductor cooler.
According to millimeter wave/THz wave imaging device described in the above-mentioned various embodiments of the disclosure, by using polygon prism
Body tilting mirror, the angle between the shaft and horizontal plane of the multiedge cylinder tilting mirror is 30 ° to 60 °, and each of multiedge cylinder tilting mirror
Side is respectively arranged with reflecting plate, and the angle between multiple reflecting plates and shaft is different, so that when multiedge cylinder turns
When mirror rotates around the shaft, multiple reflecting plates are located at the part spontaneous radiation of visual field different level position or anti-to checked object respectively
It is emitted back towards the wave beam come to be reflected, so as to realize pixel value difference, therefore can reduce the number of detector, and control letter
It is single.
Detailed description of the invention
Fig. 1 is millimeter wave/THz wave imaging device structural schematic diagram according to an embodiment of the disclosure；
Fig. 2 is according to the angle between each reflecting plate and shaft of the multiedge cylinder tilting mirror of another embodiment of the present disclosure
Schematic diagram；
Fig. 3 is a kind of millimeter wave/THz wave imaging device schematic illustration according to the disclosure；
Fig. 4 is to be shown according to structure of the condenser lens of the another embodiment of the disclosure between checked object and reflecting plate
It is intended to；
Fig. 5 is millimeter wave/terahertz wave detector of the total pixel and sparse arrangement according to one embodiment of the disclosure
The schematic diagram of array；And
Fig. 6 is according to total pixel of one embodiment of the disclosure and the schematic diagram of the scanning element of different reflecting plates.
Specific embodiment
Although being answered the disclosure is fully described referring to the attached drawing of the preferred embodiment containing the disclosure before being described herein
Disclosure described herein can be modified by understanding those skilled in the art, while obtain the technical effect of the disclosure.Cause
This, it should be understood that above description is an extensive announcement for those of ordinary skill in the art, and its content does not lie in limit
Exemplary embodiment described in the disclosure processed.
In addition, in the following detailed description, to elaborate many concrete details to provide to present disclosure convenient for explaining
The comprehensive understanding of embodiment.It should be apparent, however, that one or more embodiments without these specific details can also be with
It is carried out.In other cases, well known construction and device is diagrammatically embodied to simplify attached drawing.
Fig. 1 schematically shows millimeter wave/THz wave imaging device of the embodiment according to the disclosure.The imaging
Equipment includes quasi-optics component and millimeter wave/terahertz wave detector array 2, and wherein quasi-optics component is suitable for checked object
Millimeter wave/THz wave of 31 spontaneous radiations reflects and converges to millimeter wave/terahertz wave detector array 2, wherein quasi-optics
Component includes tri-prismoid tilting mirror 1 and condenser lens 4, and the angle between the shaft 11 and horizontal plane of tri-prismoid tilting mirror 1 is
45 °, each side of tri-prismoid tilting mirror 1 is respectively arranged with reflecting plate 1A, 1B, 1C, these three reflecting plates 1A, 1B, 1C are applicable in
In receiving and reflect millimeter wave/THz wave from checked object 31, and three reflecting plates 1A, 1B, 1C and shaft 11 it
Between angle be different, as shown in Figure 2.When 11 one circle of rotation around the shaft of tri-prismoid tilting mirror 1, can be reflected by three
Plate 1A, 1B, 1C are successively located at millimeter wave/THz wave of the part spontaneous radiation of 3 different level position of visual field to checked object
It is reflected, such as reflecting plate 1A reflects the wave beam for the forward position spontaneous radiation that checked object is located at visual field 3, is reflected
Plate 1B reflects the wave beam for the middle position spontaneous radiation that checked object is located at visual field 3, and reflecting plate 1C is to checked object position
It is reflected in the wave beam of the rear positions spontaneous radiation of visual field 3.
In accordance with an embodiment of the present disclosure, the millimeter wave/THz wave imaging device passes through three on multiedge cylinder tilting mirror 1
Reflecting plate 1A, 1B, 1C are received and are reflected by the wave beam of 31 spontaneous radiation of checked object, and after the convergence effect of line focus lens 4
(as shown in Figure 3) is received by millimeter wave/terahertz wave detector array 2.Due to three reflecting plates 1A, 1B, 1C and shaft 11 it
Between angle be different.When 11 one circle of rotation around the shaft of multiedge cylinder tilting mirror 1, three reflecting plates 1A, 1B, 1C can be passed through
The horizontal direction of visual field is reflected comprehensively, since the angle between three reflecting plates 1A, 1B, 1C and shaft 11 is different
, so as to realize pixel value difference, therefore can by millimeter wave/terahertz wave detector array 2 detector sparse distribution,
To reduce the quantity of detector.
It should be noted that, although in this embodiment, the wave beam of three reflecting plates 1A, 1B, 1C reflection is checked object
The millimeter wave or THz wave of 31 spontaneous radiations, however it will be understood by those of skill in the art that the wave beam may be irradiation
To checked object 31 and through the reflected millimeter wave/THz wave of checked object 31.Although in addition, triangular prism shown here
Body tilting mirror, it will be appreciated by those of skill in the art that other prism tilting mirrors, such as four prisms cylinder tilting mirror can also be used
To nine prism tilting mirrors, preferably tri-prismoid tilting mirror to hexagonal prism tilting mirror.
As shown in figures 1 and 3, in one exemplary embodiment, condenser lens 4 turns along the path of wave beam positioned at prism
Between mirror 1 and millimeter wave/terahertz wave detector array 2.It should be noted that it will be understood by those of skill in the art that
In some other embodiment of the disclosure, condenser lens 4 also be can be set between prism tilting mirror 1 and checked object 31, i.e.,
The wave beam of 31 spontaneous radiation of checked object passes through convergent lens 4, then reflexes to millimeter wave/THz wave by reflecting plate 1 and detects
Device array 2 is simultaneously received by millimeter wave/terahertz wave detector array 2, as shown in Figure 4.
As shown in Fig. 2, the angle between three reflecting plates 1C, 1A, 1B and shaft 11 is big in a kind of exemplary embodiment
The small direction of rotation along tri-prismoid tilting mirror 1 is incremented by.It should be noted that it will be understood by those of skill in the art that at this
In some other disclosed embodiment, the angular dimension between three reflecting plate 1C, 1A, 1B and shaft 11 is along tri-prismoid
Successively decrease the direction of rotation of tilting mirror 1.
When the quantity of reflecting plate 1A, 1B, 1C on multiedge cylinder tilting mirror 1 are m, wherein m >=3, the m reflecting plates
Angle between the shaft with the incremental increase of α or is successively decreased along the direction of rotation of the multiedge cylinder tilting mirror 1, wherein α
It is calculated by following equalities:
In formula, λ is the wavelength of the millimeter wave/THz wave,
D is the diameter of the condenser lens 4.
It should be noted that above formula is the angular resolution estimation formula under a lens ideal aggregation.In actual system
The size of α should be finely tuned according to experimental result in system, so that final pixel arrangement is as uniform as possible and non-overlapping and gap.
That is reflecting plate 1A, 1B, 1C on multiedge cylinder tilting mirror 1 and the angle between the shaft 11 are fine-tuning.
In some embodiments, when m is odd number, along the direction of rotation of multiedge cylinder tilting mirror 1 in the m reflecting plates
1st angle between reflecting plate and the shaft is 0 °, theAngle between a reflecting plate and the shaft isTheAngle between a reflecting plate and the shaft isFor example, shown in Fig. 1
Embodiment in, the 1st angle between reflecting plate 1A and shaft 11 be 0 °, the 2nd angle between reflecting plate 1B and shaft 11
Degree is+d, and the 3rd angle between reflecting plate 1C and shaft 11 is-α.
In some embodiments, when m is even number, along the 1st reflecting plate of direction of rotation and institute in the m reflecting plates
The angle stated between shaft isTheAngle between a reflecting plate and the shaft isTheIt is a
Angle between the reflecting plate and the shaft isSuch as when the quantity of reflecting plate is 4, the 1st reflection
Angle between plate and shaft 11 is2nd angle between reflecting plate and shaft 11 be3rd reflecting plate 1C with
Angle between shaft 11 is4th angle between reflecting plate and shaft 11 be
In this embodiment, the angle between shaft 11 and horizontal plane is 45 °, it should be noted that the technology of this field
Personnel should be appreciated that in some other embodiment of the disclosure, the angle may be other numerical value, such as at 30 ° to 60 °
In the range of etc..
In a kind of exemplary embodiment, which further includes driving device (not shown), such as motor, the driving
Device is suitable for 11 rotation around the shaft of driving multiedge cylinder tilting mirror 1, is swept with driving reflecting plate 1A, 1B, 1C to form level to visual field
It retouches, the speed of rotation is, for example, 1-24 revolutions per seconds.
As shown in figure 5, in one exemplary embodiment, the linear sparse row of millimeter wave/terahertz wave detector array 2
Column, and orientation is parallel with visual field normal direction.Millimeter wave/terahertz wave detector in millimeter wave/terahertz wave detector array 2
Number determined according to required visual field size and required resolution ratio, millimeter wave/terahertz wave detector size according to wavelength,
Processing technology and required sampling density etc. determine.
In addition, it should be noted that, it will be understood by those of skill in the art that in some embodiments of the present disclosure, instead
Penetrate the metal surface or metal gate grid that plate 1A, 1B, 1C can be smooth.
In one embodiment of the present disclosure, which can also include data processing equipment (not shown).The number
It is wirelessly connected according to processing unit and millimeter wave/terahertz wave detector array 2 or wired connection is to receive from millimeter wave/terahertz
Hereby wave detector array 2 for checked object 31 scan data and generate millimeter wave/THz wave image.The imaging device
It can also include display device, which is connected with data processing equipment, for receiving and showing from data processing
The millimeter wave of device/THz wave image.
In one exemplary embodiment, data processing equipment can be used for generating control signal and send control signal
To driving device to drive multiedge cylinder tilting mirror 1 to rotate.In a further exemplary embodiment, imaging device also may include and number
According to the mutually independent control device of processing unit.
In a kind of exemplary embodiment, the millimeter wave/THz wave imaging device further includes shell, quasi-optics component and
Millimeter wave/terahertz wave detector array 2 is located in shell, is provided on the side wall of shell for checked object spontaneous radiation or anti-
The window that the millimeter wave/THz wave penetrated passes through.
In a kind of exemplary embodiment, the millimeter wave/THz wave imaging device further includes calibration source, the calibration source position
In in shell and on the object plane of quasi-optics component, receive so that passing through millimeter wave/terahertz wave detector array 2 about school
The calibration data in quasi- source, data processing equipment receive millimeter wave/terahertz wave detector array 2 it is received about calibration source
Calibration data, and based on received calibration data update the image data of checked object in real time.Since calibration source is encapsulated in
Enclosure interior so that the millimeter wave/THz wave imaging device than using distant place air calibrated it is more stable can
It leans on.Calibration source for example can be the emissivity such as plastics, foam close to 1 absorbing material.In addition, calibration source can also use it is black
Body or semiconductor cooler etc..
By nyquist sampling law, could at least restore completely there are two sampled point in a half-power beam width
Image.Millimeter wave/terahertz wave detector array 2 arragement direction in the embodiment is linear array, millimeter wave/Terahertz
The arranging density of wave detector array 2 determines sampling density.Millimeter wave imaging system institute practical at image is gray level image, empty
Between sample rate when nyquist sampling requirement (lack sampling) is not achieved, still target scene can be imaged, only imaging effect
Fruit is relatively poor.In order to make up the missing of pixel brought by lack sampling, can be increased in later period signal processing using interpolation algorithm
Add packing density.
In a kind of exemplary embodiment, the length direction of calibration source is parallel to the shaft 11 of multiedge cylinder tilting mirror 1, calibration
The length in source is more than or equal to millimeter wave/terahertz wave detector array in the visual field size being parallel in rotor shaft direction, calibration source
Width be 3 times of antenna beamwidth of millimeter wave/terahertz wave detector 2.However, it is necessary to explanation, this field
It will be appreciated by the skilled person that the width of calibration source may be 1 times of millimeter wave/terahertz wave detector antenna beamwidth
Or 2 times or other multiples.
The output voltage V of detectionoutCorresponding antenna temperature is TA, following relationship should be met,
TA=(Vout-b)/a (2)
In formula, a is gain calibration coefficient,
B is biasing calibration coefficient.
Therefore, it includes to biasing calibration that calibration data based on calibration source, which updates the image data of the received checked object of institute,
The correction of coefficient b and correction to gain calibration coefficient a.
In calibration region, the radiation brightness of calibration source and its ambient enviroment can be considered as uniformly, i.e., all logical
The antenna temperature T in roadAIt is consistent.When channel is completely the same, the output V of Caustic method receiving channeloutShould be completely the same,
If output is inconsistent, needs to adjust the gain calibration coefficient a and biasing calibration coefficient b in each channel, export all channels
Unanimously, to realize that the consistency in channel is adjusted.What gain scaling parameter a reflected is the overall gain and equivalent bandwidth in channel,
This part has already passed through careful adjusting when channel debugging, it is believed that and the gain calibration coefficient a in each channel is approximately equal, therefore
Channel calibration is completed by adjusting biasing calibration coefficient b in use process.
In a kind of exemplary embodiment, based on the calibration data of received calibration source update the received checked object of institute
31 image data mainly includes the correction to biasing calibration coefficient b in real time, comprising the following steps:
A1: all channels of the millimeter wave/terahertz wave detector array are calculated in the multiple survey of the calibration region
Measure the average value of output voltage
A2: the data after the detection zone calibration in each channel are the data V that the detection zone in each channel acquiresiIt subtracts
The average valueThen again divided by the gain calibration coefficient a in each channeli。
This method can carry out piece calibration with focal plane array 1 system receiving channel array, and calibration algorithm only need to be transported simply
It calculates, it is time-consuming few, real time calibration may be implemented；Passage consistency calibration is all carried out to each image.
When equipment longtime running or replacement field of employment when, due to system temperature drift and bring system
The gain calibration coefficient a of penalty, each channel can generally also change.At this moment the gain calibration coefficient a to channel is needed
It is adjusted with biasing calibration coefficient b, specifically includes following steps
B1: the millimeter wave/terahertz wave detector array measurement air voltage value V is usedair(i), i ∈ [1, channel
Number], and calculate the average voltage level of the air in all channels
B2: the temperature of temperature and air that the calibration source is arranged has difference, is visited using the millimeter wave/THz wave
Survey the voltage value V of calibration source described in device array measurementcal(i), [1, port number] i ∈, and calculate all channels calibration source it is flat
Equal voltage valueAnd the gain calibration coefficient a in each channel is calculated by following equalitiesiWith biasing calibration coefficient bi:
B3: each channel detection zone calibration after data beAbsolute value,
Middle ViThe data acquired for the detection zone in each channel.
The output voltage data of calibration region and the output voltage data of detection zone are stored in data processing equipment
In the same data form.
In use, 11 rotation around the shaft of driving multiedge cylinder tilting mirror 1, so that three reflecting plates 1A, 1B, 1C are successively to quilt
Millimeter wave/the THz wave for the part spontaneous radiation that inspection object 31 is located at 3 different level position of visual field is reflected；Scanning imagery
When, multiedge cylinder tilting mirror 1 carries out high speed around its shaft 11 and stablizes rotation, each reflecting plate 1A, 1B, 1C of multiedge cylinder tilting mirror 1
More fast column scans, the columns and millimeter wave/terahertz wave detector of scanning successively are completed to the vertical direction of measured target 31
The quantity of detector in array 2 is consistent, as shown in Figure 6, it is assumed that horizontal direction has 48 column pixels on measured target 31, detection
It, all can be complete to measured target 31 after the quantity of device is 16, therefore each reflecting plate 1A, 1B, 1C in multiedge cylinder tilting mirror 1 are turned over
At in 16 column scan of vertical direction.Then by millimeter wave/terahertz wave detector array 2 sweeping for checked object obtained
It retouches data and is sent to data processing equipment；Finally scan data is rebuild to generate checked object using data processing equipment
Millimeter wave/THz wave image.The equipment can accurately carry out comprehensive imaging and detection to checked object 31, wherein
Checked object 31 can be human body, be also possible to article.
In addition, after generating millimeter wave/THz wave image of human body or article, it can to whether human body or article have
The position for doubting object 32 and suspicious item 32 identify and export result.The identification of suspicious item 32 and its position can be led to
The method that Computer Automatic Recognition manual identified or the two combine is crossed to carry out.As a result output can for example, by
Display indicates to directly display whether have the modes such as the conclusion of suspicious item 32 to realize in display device, can also will test result
It directly prints or sends.The security staff for executing detection can be according to the testing result that above-mentioned steps provide come to human body or article
Whether the position with suspicious item 32 and suspicious item 32 is confirmed, can also be checked by artificial detection.
According to the millimeter wave of the above-mentioned various embodiments of the disclosure/THz wave imaging device, turn by using multiedge cylinder
Mirror, the angle between the shaft and horizontal plane of the multiedge cylinder tilting mirror is 30 ° to 60 °, and each side of multiedge cylinder tilting mirror
Be respectively arranged with reflecting plate, and the angle between multiple reflecting plates and shaft is different so that when multiedge cylinder tilting mirror around
When shaft rotates, multiple reflecting plates are successively located at the part spontaneous radiation of visual field different level position to checked object or are reflected back
The wave beam come is reflected, and so as to realize pixel value difference, therefore can reduce the number of detector, and is controlled simple.
It will be understood to those skilled in the art that embodiment described above is all exemplary, and this field
Technical staff can make improvements, the rushing in terms of not recurring structure or principle of structure described in various embodiments
It can be freely combined in the case where prominent.
After the preferred embodiment that the disclosure is described in detail, those skilled in the art can be apparent from,
It does not depart from the protection scope of appended claims and spirit is lower can carry out various change and change, and the disclosure is also not only restricted to
The embodiment of examples cited embodiment in bright book.
Claims (13)
1. a kind of millimeter wave/THz wave imaging device characterized by comprising quasi-optics component and millimeter wave/THz wave
Detector array, the quasi-optics component are suitable for checked object spontaneous radiation or reflected millimeter wave/THz wave
It reflects and converges to the millimeter wave/terahertz wave detector array, wherein the quasi-optics component includes multiedge cylinder tilting mirror
And condenser lens, the angle between the shaft and horizontal plane of the multiedge cylinder tilting mirror are 30 ° to 60 °, the multiedge cylinder turns
Each side of mirror is respectively arranged with reflecting plate, and the angle between multiple reflecting plates and the shaft is different, with
So that multiple reflecting plates are successively located at view to the checked object when the multiedge cylinder tilting mirror is rotated around the shaft
The part spontaneous radiation of field different level position or reflected millimeter wave/THz wave are reflected.
2. imaging device according to claim 1, which is characterized in that condenser lens setting is in checked object and described
Between multiedge cylinder tilting mirror or it is arranged between the multiedge cylinder tilting mirror and the millimeter wave/terahertz wave detector array.
3. imaging device according to claim 2, which is characterized in that the number of the reflecting plate of the multiedge cylinder tilting mirror
Amount is m, wherein the angle between m >=3, the m reflecting plates and the shaft is along direction of rotation with the incremental increase of α
Or successively decrease, wherein α is calculated by following equalities:
In formula, λ is the wavelength of the millimeter wave/THz wave,
D is the diameter of the condenser lens.
4. imaging device according to claim 3, which is characterized in that when m is odd number, along institute in the m reflecting plates
The 1st angle between reflecting plate and the shaft for stating direction of rotation is 0 °, theBetween a reflecting plate and the shaft
Angle beTheAngle between a reflecting plate and the shaft is
5. imaging device according to claim 3, which is characterized in that when m is even number, along institute in the m reflecting plates
The 1st angle between reflecting plate and the shaft for stating direction of rotation beTheBetween a reflecting plate and the shaft
Angle isTheAngle between a reflecting plate and the shaft is
6. imaging device according to claim 1, which is characterized in that the angle of the shaft and the horizontal plane is 45 °.
7. imaging device according to claim 1, which is characterized in that further include driving device, the driving device is applicable in
It is rotated in the driving multiedge cylinder tilting mirror around the shaft.
8. imaging device according to claim 1, which is characterized in that 6 >=m.
9. imaging device according to claim 1, which is characterized in that in the millimeter wave/terahertz wave detector array
Multiple millimeter wave/terahertz wave detectors be linearly distributed.
10. imaging device according to claim 1 to 9, which is characterized in that further include:
Data processing equipment, the data processing equipment are connect to receive and with the millimeter wave/terahertz wave detector array
For the scan data of checked object and millimeter wave/THz wave is generated from the millimeter wave/terahertz wave detector array
Image；With
Display device, the display device are connected with the data processing equipment, for receiving and showing from data processing
The millimeter wave of device/THz wave image.
11. millimeter wave according to claim 10/THz wave imaging device, which is characterized in that it further include calibration source, institute
Calibration source is stated on the object plane of the quasi-optics component, the data processing equipment, which receives, comes from the millimeter wave/THz wave
The calibration data for the calibration source of detector array, and described tested pair is updated based on the received calibration data of institute
The image data of elephant.
12. millimeter wave according to claim 11/THz wave imaging device, which is characterized in that the length of the calibration source
Degree is oriented parallel to the shaft of the reflecting plate, and the length of the calibration source is more than or equal to the millimeter wave/THz wave detection
Device array is in the visual field size being parallel in the rotor shaft direction.
13. millimeter wave according to claim 11/THz wave imaging device, which is characterized in that the calibration source is to inhale
Wave material, black matrix or semiconductor cooler.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109444975A (en) * | 2018-12-29 | 2019-03-08 | 清华大学 | Millimeter wave/THz wave imaging device |
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| CN109444975A (en) * | 2018-12-29 | 2019-03-08 | 清华大学 | Millimeter wave/THz wave imaging device |
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