CN209296949U - Millimeter wave/THz wave imaging device - Google Patents
Millimeter wave/THz wave imaging device Download PDFInfo
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- CN209296949U CN209296949U CN201822275858.5U CN201822275858U CN209296949U CN 209296949 U CN209296949 U CN 209296949U CN 201822275858 U CN201822275858 U CN 201822275858U CN 209296949 U CN209296949 U CN 209296949U
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Abstract
Disclose a kind of millimeter wave/THz wave imaging device, including quasi-optics component, including polygonal-mirror and third reflecting plate, polygonal-mirror can rotate around it axis rotation, receive so that multiple reflecting plates on polygonal-mirror are used as the first reflecting plate in turn and reflect the millimeter wave from the first checked object/THz wave wave beam；Another reflecting plate adjacent with the first reflecting plate in multiple reflecting plates is used as the second reflecting plate and receives and reflect the millimeter wave from the second checked object/THz wave wave beam；Chopper, it is configured to be only from the beams incident from the second reflecting plate of the first reflecting plate or third baffle reflection at any one time to detector array, chopper is around center axis thereof rotation so that the wave beam from the first reflecting plate and third reflecting plate is alternately received by detector array.Two checked objects can be imaged simultaneously in the equipment, and detection efficiency is high, detector utilization rate is high.
Description
Technical field
This disclosure relates to technical field of imaging, 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.However existing millimeter wave/THz wave imaging device working efficiency is low.
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.
In accordance with an embodiment of the present disclosure, providing a kind of millimeter wave/THz wave imaging device includes quasi-optics component, milli
Metric wave/terahertz wave detector array and chopper,
The quasi-optics component includes:
Polygonal-mirror, each side of the polygonal-mirror are respectively arranged with reflecting plate, the polygonal-mirror energy
Axis rotation is enough rotated around it, so that multiple reflecting plates are used as the first reflecting plate in turn to receive and reflect the first checked object
Part spontaneous radiation or reflected millimeter wave/THz wave wave beam positioned at the first visual field different location；It is multiple described anti-
Another reflecting plate adjacent with first reflecting plate penetrated in plate is used as the second reflecting plate to receive and reflect second tested pair
Part spontaneous radiation or reflected millimeter wave/THz wave wave beam as being located at the second visual field different location；With
Third reflecting plate, the third reflecting plate is adapted to will be from millimeter wave // THz wave of second reflecting plate
It is reflected on the chopper；
The chopper is located at the reflection wave paths of first reflecting plate and the back wave road of the third reflecting plate, institute
Chopper is stated to be configured to be only from millimeter wave/THz wave of first reflecting plate at any one time or be only from described
The millimeter wave of three reflecting plates/THz wave reflection is transmitted to the millimeter wave/terahertz wave detector array, the chopper
Around center axis thereof rotate so that millimeter wave/THz wave from first reflecting plate and the third reflecting plate alternately
By the millimeter wave/terahertz wave detector array received；And
The millimeter wave/terahertz wave detector array is suitable for receiving the wave beam from the quasi-optics component.
In some embodiments, the quasi-optics component further includes condenser lens, and the condenser lens is located at the copped wave
Between device and the millimeter wave/terahertz wave detector array.
In some embodiments, the quasi-optics component further includes the first condenser lens and the second condenser lens, and described
For one condenser lens between first reflecting plate and the chopper, second condenser lens is located at second reflection
Between plate and the third reflecting plate.
In some embodiments, the millimeter wave/THz wave imaging device further includes absorbing material, and the absorbing material is suitable
For absorbing the millimeter wave/THz wave from first reflecting plate reflected via the chopper, and via described
Millimeter wave/THz wave from the third reflecting plate of chopper transmission.
In some embodiments, the quantity of the reflecting plate of the polygonal-mirror is m, wherein 6 >=m >=3.
In some embodiments, the m reflecting plates are parallel with the pivot center.
In some embodiments, the angle between the m reflecting plates and the pivot center turns along the polyhedron
The direction of rotation increasing or decreasing of mirror.
In some embodiments, the chopper includes at least one blade.
In some embodiments, multiple blades are equally spaced about the central axis setting.
In some embodiments, the millimeter wave/THz wave imaging device further includes shell, the quasi-optics component and institute
It states millimeter wave/terahertz wave detector array to be located in the shell, be respectively arranged in the opposing sidewalls of the shell for coming
The first window that is passed through from the wave beam of first checked object and passed through for the wave beam from second checked object the
Two windows.
In some embodiments, the millimeter wave/THz wave imaging device further includes being suitable for that the polyhedron is driven to turn
The first driving device of mirror rotation.
In some embodiments, the millimeter wave/THz wave imaging device further includes being suitable for that the chopper is driven to turn
The second dynamic driving device.
In some embodiments, the millimeter wave/THz wave imaging device further include:
Data processing equipment, the data processing equipment are connect to divide with the millimeter wave/terahertz wave detector array
Not Jie Shou from the millimeter wave/terahertz wave detector array for the image data of first checked object and for
The image data of second checked object simultaneously generates millimeter wave/THz wave image respectively；With
Display device, the display device are connected with the data processing equipment, for receiving and showing from described
The millimeter wave of data processing equipment/THz wave image.
In some embodiments, the millimeter wave/THz wave imaging device further includes warning device, the warning device with
The data processing equipment connection, so that when the data processing equipment identifies in the millimeter wave/THz wave image
Suspicious object when issue instruction the millimeter wave/THz wave image there are the alarms of suspicious object.
In some embodiments, the millimeter wave/THz wave imaging device further includes calibration source, and the calibration source is located at institute
On the object plane for stating quasi-optics component, the data processing equipment is received from the millimeter wave/terahertz wave detector array
For the calibration data of the calibration source, and update based on the calibration data image data and the institute of first checked object
State the image data of the second checked object.
In some embodiments, the millimeter wave/THz wave imaging device further includes optical pick-up apparatus, and the optics is taken the photograph
As device includes being suitable for acquiring the first optical pick-up apparatus of the optical imagery of first checked object and being suitable for acquiring
Second optical pick-up apparatus of the optical imagery of second checked object, first optical pick-up apparatus and second light
Photographic device is learned to connect with the display device respectively.
In some embodiments, the display device includes display screen, and the display screen includes being suitable for showing the milli
The first viewing area of metric wave/THz wave image and suitable for showing optical pick-up apparatus optical imagery collected
Second viewing area.
According to millimeter wave/THz wave imaging device described in the above-mentioned various embodiments of the disclosure, by driving polyhedron
Tilting mirror is around pivot axis, so that multiple reflecting plates are used as the first reflecting plate in turn to receive and reflect the first checked object
Part spontaneous radiation or reflected millimeter wave/THz wave wave beam positioned at the first visual field different location；It is multiple described anti-
Another reflecting plate adjacent with first reflecting plate penetrated in plate is used as the second reflecting plate to receive and reflect second tested pair
Part spontaneous radiation or reflected millimeter wave/THz wave wave beam as being located at the second visual field different location, to realize
Two checked objects are imaged, thus improve detection efficiency, and detector utilization rate is high, control is simple, at low cost.
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 the knot according to millimeter wave/THz wave imaging device of another embodiment of the present disclosure after removing shell
Structure schematic diagram；
Fig. 3 is millimeter wave/THz wave imaging device polygonal-mirror according to an exemplary embodiment of the disclosure
Main view；
Fig. 4 is the side view of polygonal-mirror shown in Fig. 3；
Fig. 5 is the knot according to an exemplary embodiment of millimeter wave/THz wave imaging device chopper of the disclosure
Structure schematic diagram；
Fig. 6 is the another exemplary embodiment according to millimeter wave/THz wave imaging device chopper of the disclosure
Structural schematic diagram；
Fig. 7 is another exemplary embodiment according to millimeter wave/THz wave imaging device chopper of the disclosure
Structural schematic diagram；
Fig. 8 is the another exemplary embodiment according to millimeter wave/THz wave imaging device chopper of the disclosure
Structural schematic diagram；
Fig. 9 is the schematic diagram of lens imaging；And
Figure 10 is according to the angle between each reflecting plate and pivot center of the polygonal-mirror of another embodiment of the present disclosure
The schematic diagram of degree；
Figure 11 is according to the total pixel of millimeter wave/THz wave imaging device of one embodiment of the disclosure, respectively reflection
Millimeter wave/terahertz wave detector array schematic diagram of the scanning element of plate and sparse arrangement；
Figure 12 is to be examined according to millimeter wave/THz wave imaging device of an embodiment of the disclosure to human body or article
The flow chart for the method looked into；And
Figure 13 is millimeter wave/THz wave imaging device application scenario diagram according to an embodiment of the disclosure.
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.
Millimeter wave/THz wave imaging that Fig. 1 schematically shows a kind of exemplary embodiment according to the disclosure is set
Standby 100.As shown, the millimeter wave/THz wave imaging device 100 includes quasi-optics component, chopper 8 and millimeter wave/too
Hertz wave detector array 2, quasi-optics component include polygonal-mirror 1, and each side of polygonal-mirror 1 is respectively arranged with instead
Plate 1A, 1B, 1C, 1D are penetrated, polygonal-mirror 1 can rotate around it axis o rotation, so that multiple reflecting plate 1A, 1B, 1C, 1D
In turn be used as the first reflecting plate come receive and reflect the first checked object 31A be located at the first visual field 3A different location part it is spontaneous
Radiation or reflected millimeter wave/THz wave；It is adjacent with the first reflecting plate in multiple reflecting plate 1A, 1B, 1C, 1D simultaneously
Another reflecting plate be used as the second reflecting plate and to receive and reflect the second checked object 31B be located at the second visual field 3B different location
Part spontaneous radiation or reflected millimeter wave/THz wave wave beam；The quasi-optics component further includes third reflecting plate 7, the
Three reflecting plates 7 are adapted to will be on the beams reflected of the second baffle reflection to chopper 8.Collimating optical element further includes the first focusing
Lens 4A and the second condenser lens 4B, the first condenser lens 4A are suitable for converging the wave beam from the first reflecting plate 1A, this
Two condenser lens 4B are suitable for converging the wave beam from the second reflecting plate 1B.Chopper 8 is located at the reflection wave paths of the first reflecting plate
With the back wave of third reflecting plate 7 road, and it is configured to be only from millimeter wave/terahertz of the first reflecting plate at any one time
Hereby wave or it is only from the millimeter wave of third reflecting plate 7/THz wave reflection or is transmitted to millimeter wave/terahertz wave detector array
2, chopper 8 can be rotated around center axis thereof 81 so that millimeter wave/Terahertz from the first reflecting plate and third reflecting plate 7
Wave is alternately received by millimeter wave/terahertz wave detector array 2.Millimeter wave/terahertz wave detector array 2 is suitable for receiving
From quasi-optics component reflect and converge after wave beam；Detector in millimeter wave/terahertz wave detector array 2 it is several
Determine that arragement direction is vertical with visual field normal and is parallel to level according to required visual field 3A, 3B size and required resolution ratio
The size in face, detector is determined according to wavelength, processing technology and required sampling density.
Millimeter wave according to an embodiment of the present disclosure/THz wave imaging device, by driving polygonal-mirror 1 around its turn
Shaft line o rotation, so that multiple reflecting plate 1A, 1B, 1C, 1D are used as the first reflecting plate in turn to receive and reflect first and be detected
Object 31A is located at part spontaneous radiation or the reflected millimeter wave/THz wave wave beam of the first visual field 3A different location；It is more
Another reflecting plate adjacent with first reflecting plate in a described reflecting plate 1A, 1B, 1C, 1D is used as the second reflecting plate to connect
Receive and reflect the second checked object 31B be located at the second visual field 3B different location part spontaneous radiation or reflected millimeter
Wave/THz wave wave beam will be from the view of the first visual field 3A and second by chopper 8 during polygonal-mirror 1 rotates
Millimeter wave/THz wave of field 3B is to switch alternately to the same millimeter wave/terahertz wave detector array 2, thus realization pair
While imaging positioned at two checked objects 31A, 31B of two visual fields 3A, 3B, millimeter wave/THz wave can be reduced
The quantity of detector, to reduce equipment cost, and space occupied is small.
In this embodiment, condenser lens 4 includes the first condenser lens 4A and the second condenser lens 4B, the first condenser lens
4A between the first reflecting plate and chopper 8, the second condenser lens 4B between the second reflecting plate and third reflecting plate 7,
The focal length of two condenser lenses 4A, 4B are respectively that the size of f1, f2, wherein f1 and f2 can be the same, are also possible to different
Sample.It is placed in the wave paths after condenser lens 4A, 4B focusing due to chopper 8, the ruler of the blade 82 of chopper 8
It is very little can be smaller, in this case, the specific size of the blade 82 of chopper 8 by after condenser lens 4A, 4B focusing
The beam spot size in the place of pre-placing chopper 8 determines.Assuming that in pre-placing chopper 8 after condenser lens 4A, 4B focusing
Place beam size be Wcut, then the size (area) of the blade 82 of chopper 8 is selected as
It should be noted that it will be understood by those of skill in the art that such as scheming in some other embodiment of the disclosure
Shown in 2, a condenser lens 4 can also be used, which is located at chopper 8 and millimeter wave/terahertz wave detector battle array
Between column 2.In this case, since chopper 8 is placed in unfocused wave paths, so the size of its blade 82 is answered
Match with the reflecting surface of polygonal-mirror.
In Fig. 1 and exemplary implementation shown in Fig. 2, the millimeter wave/THz wave imaging device further includes absorbing material
9, which is suitable for absorbing the millimeter wave/THz wave from the first reflecting plate reflected via chopper 8, and
Millimeter wave/the THz wave from third reflecting plate 7 transmitted via chopper 8.
In Fig. 1 and exemplary embodiment shown in Fig. 2, each reflecting plate 1A, 1B, 1C, 1D be rectangle, length and
Width should match with corresponding condenser lens 4A, 4B, it is generally the case that the width of each reflecting plate 1A, 1B, 1C, 1D are greater than
Or the diameter equal to corresponding condenser lens 4A, 4B, the length of each reflecting plate 1A, 1B, 1C, 1D should be its width
Times, the diameter of condenser lens 4A, 4B for example can be 3cm-50cm.
As shown in Figure 1, the millimeter wave/THz wave imaging device further includes shell 6 in a kind of exemplary embodiment,
Quasi-optics component and millimeter wave/terahertz wave detector array 2 are located in shell 6, are respectively arranged in the opposing sidewalls of shell 6
The second checked object of first window 61A and confession passed through for millimeter wave/THz wave of the first checked object 31A spontaneous radiation
The second window 61B that millimeter wave/THz wave of 31B spontaneous radiation passes through.
As shown in Figure 3 and Figure 4, in a kind of exemplary embodiment, facted lens 1 further includes shaft 11, shaft 11
Both ends are rotatably coupled via bearing 10A, 10B and shell 6, so that polygonal-mirror 1 can rotate, so that first
Reflecting plate and the second reflecting plate are respectively to the part for being located at visual field 3A, 3B difference vertical position from checked object 31A, 31B
Wave beam is reflected.
As shown in Figure 3 and Figure 4, in a kind of exemplary embodiment, the millimeter wave/THz wave imaging device further includes fitting
For the first driving device 13 that drive shaft 11 rotates, such as servo motor.
As shown in Figure 3 and Figure 4, in a kind of exemplary embodiment, the millimeter wave/THz wave imaging device further includes reality
When detection polygonal-mirror 1 angular displacement angle displacement measurement mechanism 12, such as photoelectric code disk, so that multi-panel is accurately calculated
The posture of body tilting mirror 1, this can reduce the development difficulty of control algolithm and imaging algorithm to a great extent.
Fig. 5 to Fig. 8 respectively illustrates the structural schematic diagram of several choppers, and chopper 8 includes at least one blade, such as
1,2,3 and 4 etc., multiple blades 82 are equally spaced about the setting of central axis 81.In chopper 8 around center axis thereof
During 81 rotations, at any one time when millimeter wave/THz wave from the first reflecting plate is incident on the blade of chopper 8
On 82, which is reflected into absorbing material 9 for millimeter wave/THz wave from the first reflecting plate, to be inhaled by absorbing material 9
It receives, while millimeter wave/THz wave from third reflecting plate 7 is reflected into millimeter wave/terahertz wave detector array 2.With
Rotation of the chopper 8 around center axis thereof 81, in subsequent time, the millimeter wave from the first reflecting plate/THz wave is incident
The part (i.e. empty part) of blade 82 is not provided with to chopper 8, to be transmitted to millimeter wave/terahertz wave detector array 2,
Millimeter wave/THz wave from third reflecting plate 7 is transmitted to suction wave simultaneously by the part that the chopper 8 is not provided with blade 82
Material 9 is circuited sequentially down with being absorbed by absorbing material 9.
It should be noted that chopper 8 can also be by that can be quickly switched into other dresses of high reflection and highly transmissive state
It sets to replace.
In Fig. 1 and exemplary embodiment shown in Fig. 2, chopper 8 is with the wave paths from the first reflecting plate and from the
The wave paths of three reflecting plates 7 are in that 45 degree of angles are placed.It should be noted that it will be understood by those of skill in the art that in this public affairs
In some other embodiment opened, chopper 8 and the wave paths from the first reflecting plate and the wave paths from third reflecting plate 7 can also
To be placed in other angles.
In a kind of unshowned exemplary embodiment, the millimeter wave/THz wave imaging device 100 further includes being suitable for
The second driving device for driving chopper 8 to rotate, such as servo motor, to drive chopper 8 to revolve at a high speed around center axis thereof 81
Turn, the swing circle of chopper 8 should match with the scan period of polygonal-mirror 1, so as to the millimeter wave/THz wave
Imaging device 100 can simultaneously be imaged two checked objects of two visual fields 3A, 3B respectively, the preferably rotation of chopper 8
The turn-week phase is the 1/1000-1/2 of the scan period of polygonal-mirror.
In this embodiment, the static visual field of detector is horizontal field of view, it is assumed that the number of detector is N, and two adjacent
Detector center spacing d when, then the maximum offset-fed distance y of detectorm, then
It is possible thereby to which calculating the static visual field of millimeter wave/terahertz wave detector array 2 is H0.As shown in figure 9, millimeter
The static visual field H of wave/terahertz wave detector array 20With object distance L1, image distance L2Need to meet following relational expression
Polygonal-mirror 1 is rotated around its pivot center o, scan as needed tested pair of the angular dimension of data acquisition
As 31 short transverse field range determine, it is assumed that imaging viewing field needed for short transverse for angle orientation be θm, that
Corresponding scanning field of view angle is θrot=θm/2。
It is vertical to the visual field where corresponding checked object 31A (31B) that first reflecting plate 1A (the second reflecting plate 1B) is completed
The times N swung required for the reflection of rangevIt is calculate by the following formula:
In formula, [], expression rounded up；
L be visual field 3A (3B) center to the center of the first reflecting plate 1A (the second reflecting plate 1B) distance；
δ indicates object space resolution ratio；
θmCorresponding field of view angle is beaten for vertical field range.
Polygonal-mirror 1 rotates the acquisition that a cycle completes m width image to each visual field, wherein m is polygonal-mirror
Reflecting plate quantity.
Short transverse sampling density is decided by that wave beam residence time, polygonal-mirror 1 rotate 1 period, two visual field directions
Each output m sub-picture.Assuming that the angular resolution of detector is θres, the rotation of polygonal-mirror 1 θrotThe 3dB numbers of beams for being included is
N=360 °/θres (4)
Assuming that imaging rate requirement be mHz, then it is each sampling wave beam the average residence time τ in short transversedFor
At image-forming range system 3000mm, angular resolution θres=0.57 °, then object space resolution ratio is δ=30mm, imaging
For rate 10Hz, the step number that can be acquired in the hope of short transverse is about 67, and average each wave beam residence time is τd=
100ms/67=1.47ms.
In a kind of exemplary embodiment, work in millimeter wave/THz wave imaging device that centre frequency is 94GHz
100, it detector number N=30, forms a line, the center spacing d=7mm of detector, detector array length 2ym=
21cm.Object distance L1=3.5m, image distance L2=0.7m can calculate static visual field H according to formula (2)0=105cm.Assuming that imaging
Region height direction size is 1.8m, then the scanning angle of the short transverse for reconstruction image is θm=34 °.
In a further exemplary embodiment, it works in millimeter wave/THz wave imaging device that centre frequency is 220GHz
100, it detector number N=48, forms a line, d=3mm between the center of detector, detector array length 2ym=
14.4cm.Object distance Ll=5m, image distance L2=0.7m can calculate static visual field H according to formula (2)0=103cm.Assuming that imaging
Region height direction size is 1.8m, then the scanning angle of the short transverse for reconstruction image is θm=20 °.
In Fig. 1 into exemplary embodiment shown in Fig. 3, polygonal-mirror 1 includes 4 reflecting plate 1A, 1B, 1C, 1D, and 4
A reflecting plate is parallel with pivot center o.It should be noted that it will be understood by those of skill in the art that in the disclosure
Some other embodiment in, polygonal-mirror 1 also may include the reflecting plate of other quantity, the preferably quantity m of reflecting plate be 3
To 6.In addition, in certain embodiments, the angle between m reflecting plate and pivot center o can be along polygonal-mirror 1
Direction of rotation is with the incremental increase of α or successively decreases, in this way can be by millimeter wave/terahertz wave detector battle array to realize pixel value difference
The detector sparse distribution (as shown in figure 11) of column 2, to reduce the quantity of detector.
Wherein α is calculated by following equalities:
In formula, λ is millimeter wave/THz wave wavelength,
D is the diameter of ellipsoidal mirror equivalent lens 9.
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 the angle between reflecting plate 1A, 1B, 1C, 1D and pivot center o on polygonal-mirror 1 is fine-tuning.
As shown in Figure 10, in a kind of exemplary embodiment, between 4 reflecting plates 1A, 1B, 1C, 1D and pivot center o
Angular dimension is incremented by along the direction of rotation of polygonal-mirror 1.1st angle, θ between reflecting plate 1A and pivot center o be2nd angle between reflecting plate and pivot center o be3rd angle, θ between reflecting plate 1C and pivot center o
For4th angle, θ between reflecting plate 1D and pivot center o beIt should be noted that those skilled in the art answers
Work as understanding, the angle, θ in some other embodiment of the disclosure, between 4 reflecting plates 1A, 1B, 1C, 1D and pivot center o
Size can also successively decrease along the direction of rotation of polygonal-mirror 1.
In some embodiments, when m is odd number, along the 1st of the direction of rotation of polygonal-mirror 1 in m reflecting plate
Angle, θ between reflecting plate and pivot center o is 0 °, theAngle, θ between a reflecting plate and pivot center o isTheAngle, θ between a reflecting plate and pivot center o isFor example, when m is 3
When, the 1st angle, θ between reflecting plate 1A and pivot center o is 0 °, the 2nd angle between reflecting plate 1B and pivot center o
θ is+α, and the 3rd angle, θ between reflecting plate 1C and pivot center o is-α.
In some embodiments, when m is even number, along the 1st reflecting plate and rotation axis of direction of rotation in m reflecting plate
Angle, θ between line o isTheAngle, θ between a reflecting plate and pivot center o isTheIt is a anti-
The angle, θ penetrated between plate and pivot center o is
In a kind of exemplary embodiment, the millimeter wave/THz wave imaging device 100 further includes data processing equipment
(not shown).The data processing equipment is wirelessly connected with millimeter wave/terahertz wave detector array 2 or wired connection to connect respectively
It is received about the first checked object 31A and about the second checked object 31B to receive 2 institute of millimeter wave/terahertz wave detector array
Image data.
In one exemplary embodiment, which can also include display device, at the display device and data
Reason device is connected, for receiving and showing the millimeter wave from data processing equipment/THz wave image.
As shown in Figure 1, the millimeter wave/THz wave imaging device 100 further includes calibration in a kind of exemplary embodiment
Source 5, the calibration source 5 are located in shell 6 and on the object plane of quasi-optics component, to pass through millimeter wave/terahertz wave detector battle array
Column 2 receive the calibration data about calibration source 5, and data processing equipment receives millimeter wave/terahertz wave detector array 2 and received
The calibration data about calibration source 5, and the first checked object 31A and the second checked object are updated based on calibration data in real time
The image data of 31B.Since calibration source 5 is encapsulated in inside shell 1, so that the millimeter wave/THz wave imaging device 100
It is calibrated than the air using distant place more reliable and more stable.
In this embodiment, calibration source 5 is located at the oblique upper of polygonal-mirror 1, it should be noted that the position of calibration source 5
As long as set make millimeter wave/terahertz wave detector array 2 receive calibration data and checked object 31A about calibration source 5,
The image data of 31B does not interfere, and the wave beam that calibration source 5 radiates is via baffle reflection to millimeter wave/THz wave
Detector array 2 may be implemented further to protect the calibration comprising condenser lens 4 and the complete receiving channel of detector in this way
The consistency in channel is demonstrate,proved.
In Fig. 1 and exemplary embodiment shown in Fig. 2, the shaft 11 of polygonal-mirror 1 is horizontally disposed, so that first
The wave beam of reflecting plate, the second reflecting plate to the part for being located at visual field difference vertical position from corresponding checked object 31A, 31B
It is reflected.It should be noted that it will be understood by those of skill in the art that in some other embodiment of the disclosure, it is more
The shaft 11 of face body tilting mirror 1 can also be vertically arranged, so that the first reflecting plate, the second reflecting plate are to from corresponding tested pair
As 31A, 31B wave beam for being located at the part of visual field different level position are reflected.In addition, calibration source 5 can be plastics, foam
Etc. absorbing material of the emissivity close to 1, can also be using black matrix 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 vertical with visual field normal and is parallel to water
Plane is sampled with the visual field to short transverse, and millimeter wave/terahertz wave detector array 2 arranging density determines sampling
Density.Millimeter wave imaging system institute practical at image is gray level image, and space sampling frequency is wanted nyquist sampling is not achieved
When asking (lack sampling), still target scene can be imaged, only imaging effect is relatively poor.It is brought to make up lack sampling
Pixel missing, can in later period signal processing using interpolation algorithm increase packing density.
As shown in Figure 1, the length direction of calibration source 5 is parallel to turning for polygonal-mirror 1 in a kind of exemplary embodiment
Axis 11, the length of calibration source 5 are more than or equal to millimeter wave/terahertz wave detector array 2 in the view being parallel on 11 direction of shaft
Field size, the width of calibration source 5 are 10 times of the antenna beamwidth of millimeter wave/terahertz wave detector 2.However, it is necessary to say
It is bright, it will be understood by those of skill in the art that the width of calibration source 5 may be millimeter wave/terahertz wave detector
1 times of antenna beamwidth or 2 times or other multiples.
In one embodiment, the millimeter wave/THz wave imaging device 100 further includes optical pick-up apparatus, the optics
Photographic device includes being suitable for acquiring the first optical pick-up apparatus of the optical imagery of the first checked object 31A and being suitable for acquiring
Second optical pick-up apparatus of the optical imagery of the second checked object 31B, the optical pick-up apparatus are connect with display device, the light
Learning photographic device may be implemented visible light real time imagery, provide the image letter of the first checked object 31A and the second checked object 31B
Breath, to be compareed with millimeter wave/THz wave image, for user's reference.
In a kind of unshowned exemplary embodiment, display device includes display screen, and display screen includes being suitable for display
The first viewing area of the millimeter wave of first checked object 31A and the second checked object 31B/THz wave image and it is suitable for aobvious
Show the second viewing area of the optical imagery of optical pick-up apparatus the first checked object 31A collected and the second checked object 31B,
In order to which user compares optical pick-up apparatus optical imagery collected and millimeter wave/THz wave image.
In a kind of unshowned exemplary embodiment, the millimeter wave/THz wave imaging device 100 further includes alarm dress
It sets, which connect with data processing equipment, so that when identifying tested pair of the first checked object 31A and/or second
As 31B millimeter wave/THz wave image in suspicious object when, such as the millimeter wave corresponding to corresponding checked object/
It sounds an alarm such as alarm lamp below THz wave image to light, it should be noted that the report of auditory tone cues can also be used
Police's formula.
In one exemplary embodiment, data processing equipment can be used for generating control signal and send control signal
To first driving device 13 and the second driving device, rotated with respectively driving polygonal-mirror and chopper 8.In another exemplary
In embodiment, imaging device also may include and the mutually independent control device of data processing equipment.
As shown in figure 12, the disclosure additionally provide it is a kind of using millimeter wave/THz wave imaging device 100 to human body or object
The method that product are detected, comprising the following steps:
S1: driving polygonal-mirror 1 rotates, so that multiple reflecting plate 1A, 1B, 1C, 1D are used as the first reflecting plate in turn
Come receive and reflect the first checked object 31A be located at the first visual field 3A different location part spontaneous radiation or reflected milli
Metric wave/THz wave wave beam；Another reflection adjacent with first reflecting plate in multiple described reflecting plate 1A, 1B, 1C, 1D
Plate is used as the second reflecting plate to receive and reflect the spontaneous spoke in part that the second checked object 31B is located at the second visual field 3B different location
It penetrates or reflected millimeter wave/THz wave wave beam；During polygonal-mirror 1 rotates, chopper 8 is around central shaft
Line rotate so that millimeter wave/THz wave and third reflecting plate 7 from first reflecting plate reflected from described the
Millimeter wave/THz wave of two reflecting plates is alternately received by millimeter wave/terahertz wave detector array 2；
S2: by millimeter wave/terahertz wave detector array 2 image data obtained for the first checked object 31A
Data processing equipment is sent to the image data about the second checked object 31B；
S3: the data processing equipment image data to the first checked object 31A and the second checked object 31B respectively are utilized
Image data is rebuild to generate millimeter wave/THz wave image of the first checked object 31A and the second checked object 31B.
This method can carry out comprehensive imaging and detection to two checked objects 31A, 31B simultaneously, wherein tested pair
As 31 can be human body, it is also possible to article.When checked object 31A, 31B are human bodies, the millimeter wave/THz wave imaging is set
Standby 100 can cooperate article imaging device 200 to use, as shown in figure 13, two checked objects 31A and 31B respectively left side to
Inspection position and right side suspected location are detected, alternatively, can also complete just as a checked object 31A in left side suspected location
It after the detection of face, can run to along path shown in arrow to right side suspected location, and complete back side detection, without
Checked object 31A, which is turned round, can be completed comprehensive detection.
In a kind of exemplary embodiment, this method is further comprising the steps of before step S3: when 1 turn of polygonal-mirror
When moving calibration region, the calibration data about calibration source 5 is received by millimeter wave/terahertz wave detector array 2；And base
In calibration source 5 calibration data real-time update received first checked object 31A and the second checked object 31B picture number
According to.
The output voltage V of detectionoutCorresponding antenna temperature is TA, following relationship should be met,
TA=(Vout-b)/a (7)
In formula, a is gain calibration coefficient,
B is biasing calibration coefficient.
Therefore, calibration data based on calibration source 5 update the image data of institute received checked object 31A, 31B including pair
Bias the correction of calibration coefficient b and the correction to gain calibration coefficient a.
In calibration region, the radiation brightness of calibration source 5 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
Normal use process lieutenant colonel passes through adjusting biasing calibration coefficient b to complete.
In a kind of exemplary embodiment, calibration data based on calibration source 5 update received checked object 31 figure
As data mainly include the correction to biasing calibration coefficient b, 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.
It is acquired in each 3dB beam positional of data processing equipment twice, so in the embodiment shown in fig. 1, Mei Getong
Road obtains at least ten acquisition data in calibration region.In the output voltage data of calibration region and the output voltage of detection zone
Data are stored in the same data form of data processing equipment.
Property embodiment as an example, this method can also include S4: generate the first checked object 31A and the second quilt
After the millimeter wave/THz wave image for examining object 31B, whether the first checked object 31A and the second checked object 31B are had
The position of suspicious item and suspicious item identify and export result.
In above-mentioned steps, Computer Automatic Recognition or artificial knowledge can be passed through for the identification of suspicious item and its position
Not or the two method for combining carries out.As a result output can be directly displayed for example, by showing to indicate on the display apparatus
Whether the modes such as the conclusion of suspicious item are had to realize, can also will test result and directly print or send.
Execute detection security staff can according to the testing result that above-mentioned steps S4 is provided come to human body or article whether
Position with suspicious item and suspicious item is confirmed, can also be checked by artificial detection.
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 (17)
1. a kind of millimeter wave/THz wave imaging device, which is characterized in that visited including quasi-optics component, millimeter wave/THz wave
Device array and chopper are surveyed,
The quasi-optics component includes:
Polygonal-mirror, each side of the polygonal-mirror are respectively arranged with reflecting plate, and the polygonal-mirror can be around
Its pivot axis is located at so that multiple reflecting plates are used as the first reflecting plate in turn to receive and reflect the first checked object
The part spontaneous radiation of first visual field different location or reflected millimeter wave/THz wave wave beam；Multiple reflecting plates
In another reflecting plate adjacent with first reflecting plate be used as the second reflecting plate and receive and reflect the second checked object position
Part spontaneous radiation or reflected millimeter wave/THz wave wave beam in the second visual field different location；With
Third reflecting plate, the third reflecting plate is adapted to will the millimeter wave from second reflecting plate // THz wave reflection
Onto the chopper；
The chopper is located at the reflection wave paths of first reflecting plate and the back wave road of the third reflecting plate, described to cut
Wave device is configured to be only from millimeter wave/THz wave of first reflecting plate at any one time or to be only from the third anti-
It penetrates millimeter wave/THz wave reflection of plate or is transmitted to the millimeter wave/terahertz wave detector array, the chopper is around it
Center axis thereof so that millimeter wave/THz wave from first reflecting plate and the third reflecting plate alternately by institute
State millimeter wave/terahertz wave detector array received；And
The millimeter wave/terahertz wave detector array is suitable for receiving the wave beam from the quasi-optics component.
2. millimeter wave according to claim 1/THz wave imaging device, which is characterized in that the quasi-optics component is also
Including condenser lens, the condenser lens is between the chopper and the millimeter wave/terahertz wave detector array.
3. millimeter wave according to claim 1/THz wave imaging device, which is characterized in that the quasi-optics component is also
Including the first condenser lens and the second condenser lens, first condenser lens is located at first reflecting plate and the chopper
Between, second condenser lens is between second reflecting plate and the third reflecting plate.
4. millimeter wave according to claim 1/THz wave imaging device, which is characterized in that it further include absorbing material, institute
Absorbing material is stated to be suitable for absorbing the millimeter wave/THz wave from first reflecting plate reflected via the chopper,
And millimeter wave/the THz wave from the third reflecting plate transmitted via the chopper.
5. millimeter wave according to claim 1/THz wave imaging device, which is characterized in that the polygonal-mirror
The quantity of the reflecting plate is m, wherein 6 >=m >=3.
6. millimeter wave according to claim 5/THz wave imaging device, which is characterized in that the m reflecting plates and institute
It is parallel for stating pivot center.
7. millimeter wave according to claim 5/THz wave imaging device, which is characterized in that the m reflecting plates and institute
The angle between pivot center is stated along the direction of rotation increasing or decreasing of the polygonal-mirror.
8. millimeter wave according to claim 1/THz wave imaging device, which is characterized in that the chopper includes extremely
A few blade.
9. millimeter wave according to claim 8/THz wave imaging device, which is characterized in that between multiple described blades etc.
It is arranged every ground around the central axis.
10. millimeter wave according to claim 1/THz wave imaging device, which is characterized in that it further include shell, it is described
Quasi-optics component and the millimeter wave/terahertz wave detector array are located in the shell, in the opposing sidewalls of the shell
It is respectively arranged with the first window for supplying the wave beam from first checked object to pass through and for from second checked object
The second window for passing through of wave beam.
11. millimeter wave according to claim 1/THz wave imaging device, which is characterized in that further include being suitable for driving
The first driving device of the polygonal-mirror rotation.
12. millimeter wave according to claim 1/THz wave imaging device, which is characterized in that further include being suitable for driving
Second driving device of the chopper rotation.
13. millimeter wave described in any one of -12/THz wave imaging device according to claim 1, which is characterized in that also wrap
It includes:
Data processing equipment, the data processing equipment are connect with the millimeter wave/terahertz wave detector array to connect respectively
It receives from the millimeter wave/terahertz wave detector array for the image data of first checked object and for described
The image data of second checked object simultaneously generates millimeter wave/THz wave image respectively；With
Display device, the display device are connected with the data processing equipment, for receiving and showing from the data
The millimeter wave of processing unit/THz wave image.
14. millimeter wave according to claim 13/THz wave imaging device, which is characterized in that it further include warning device,
The warning device is connect with the data processing equipment so that when the data processing equipment identify the millimeter wave/
The instruction millimeter wave/THz wave image is issued when suspicious object in THz wave image, and there are the alarms of suspicious object.
15. millimeter wave according to claim 13/THz wave imaging device, which is characterized in that it further include calibration source, institute
It states calibration source to be located on the object plane of the quasi-optics component, the data processing equipment, which receives, comes from the millimeter wave/Terahertz
The calibration data for the calibration source of wave detector array, and first checked object is updated based on the calibration data
Image data and second checked object image data.
16. millimeter wave according to claim 13/THz wave imaging device, which is characterized in that further include optical camera
Device, the optical pick-up apparatus include the first optical camera dress suitable for acquiring the optical imagery of first checked object
It sets and the second optical pick-up apparatus of the optical imagery suitable for acquiring second checked object, first optical camera fills
It sets and is connect respectively with the display device with second optical pick-up apparatus.
17. millimeter wave according to claim 16/THz wave imaging device, which is characterized in that the display device packet
Display screen is included, the display screen includes being suitable for showing the first viewing area of the millimeter wave/THz wave image and being applicable in
In the second viewing area for showing the optical pick-up apparatus optical imagery collected.
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| CN201822275858.5U CN209296949U (en) | 2018-12-29 | 2018-12-29 | Millimeter wave/THz wave imaging device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633775A (en) * | 2018-12-29 | 2019-04-16 | 同方威视技术股份有限公司 | The method that millimeter wave/THz wave imaging device detects human body or article |
| WO2020134336A1 (en) * | 2018-12-29 | 2020-07-02 | 清华大学 | Millimeter-wave/terahertz-wave imaging apparatus, and inspection method for body or object |
-
2018
- 2018-12-29 CN CN201822275858.5U patent/CN209296949U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633775A (en) * | 2018-12-29 | 2019-04-16 | 同方威视技术股份有限公司 | The method that millimeter wave/THz wave imaging device detects human body or article |
| WO2020134336A1 (en) * | 2018-12-29 | 2020-07-02 | 清华大学 | Millimeter-wave/terahertz-wave imaging apparatus, and inspection method for body or object |
| CN109633775B (en) * | 2018-12-29 | 2024-01-26 | 同方威视技术股份有限公司 | Method for detecting human body or article by millimeter wave/terahertz wave imaging equipment |
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