CN208239636U - A kind of Terahertz scanning imaging system based on passive type - Google Patents
A kind of Terahertz scanning imaging system based on passive type Download PDFInfo
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- CN208239636U CN208239636U CN201820884579.6U CN201820884579U CN208239636U CN 208239636 U CN208239636 U CN 208239636U CN 201820884579 U CN201820884579 U CN 201820884579U CN 208239636 U CN208239636 U CN 208239636U
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Abstract
The utility model relates to optical image technology fields, and in particular to a kind of Terahertz scanning imaging system based on passive type, including the scanning means, THz wave converging device and terahertz detection device set gradually from top to bottom；THz wave converging device is used to converge the THz wave of scanning means reflection, and is sent in terahertz detection device, and the scanning means can be rotated around horizontal direction or/and vertical direction.The point by point scanning to measured object is completed in the composite rotating movement of horizontal axis and vertical axis of a kind of Terahertz scanning imaging system based on passive type of the utility model by using plane mirror in face, during the scanning process, realize 360 ° of horizontal direction scannings, scanning range is big, visual field is big, due to being rotated around central axis, revolving speed is fast, also without acceptance of persons movement and eccentric shaking；Wave transparent shell is provided with outside plane mirror, when can be greatly reduced scanning caused by windage, scan more smooth.
Description
Technical field
The utility model relates to optical image technology fields, and in particular to a kind of Terahertz scanning imagery based on passive type
System.
Background technique
Terahertz (THz) refers to electromagnetic wave of the frequency between 0.1THz ~ 10THz, and THz wave is between microwave and red
Between external wave, there is the features such as good to material permeabilities such as plastics, the scraps of paper, textile and leathers, the high resolution of imaging, in recent years
Come various countries and has been achieved for remarkable progress, especially Terahertz in the fermentation such as Terahertz communication, Terahertz radar, terahertz imaging
Safety check has obtained preliminary application.
Currently, due to the limitation of material and technology, terahertz detector is sufficiently expensive, it is desirable to realize two-dimentional as CCD
Face array image-forming cost is very high, so being only used among laboratory, existing Terahertz safety check uses one or more mostly
Terahertz detector is imaged by mechanical scanning.
In the prior art, one kind is to be moved back and forth in Terahertz scanning imagery using mechanical scanning part to be imaged, still,
This kind of scanning mode has the shortcomings that vibration is big, noise is big, speed is slow in actual use, is unfavorable for terahertz imaging；
Another kind of is to use rotary wedge mirror, angled by wedge-shaped mirrors shaft and mirror mirror normal, reaches the mesh of scanning
, the shortcomings that this kind of scanning mode, is, each tilting mirror high speed rotation and angle needs precise match, arranges sufficiently complex, cost
Height, implementation is excessively complicated, angled between tilting mirror shaft and mirror normal, there is an eccentric shaking, with turning when rotation
Speed increases, and tilting mirror vibration increases, prevent scanning speed is from improving；Last one kind is to carry out longitudinal scanning using multi-panel roller,
Such scanning mode scanning speed is fast, is conducive to terahertz imaging, but has the disadvantage that multi-panel roller when rotating at high speed, windage
It can rise with revolving speed exponentially curve, scanning speed can be impacted, and noise is very big.
Utility model content
It aiming at the problem that mentioning in the prior art, the utility model proposes one kind, does not need to move back and forth, when rotation is unbiased
Heart vibration, structure is simple, does not need strictly to move cooperation, and rotation windage wind is made an uproar minimum, and only needs in no reciprocating motion
Will singly be popped one's head in i.e. imageable scanning system.
In order to achieve the above object, the utility model is achieved through the following technical solutions:
Including the scanning means, THz wave converging device and terahertz detection device set gradually from top to bottom；Terahertz
Hereby wave converging device is used to converge the THz wave of scanning means reflection, and is sent in terahertz detection device, described
Scanning means can be rotated around horizontal direction or/and vertical direction, and the scanning means includes plane mirror and wave transparent shell.
Preferably, the plane mirror is arranged in wave transparent shell, and fastens and be connected.
Preferably, the wave transparent shell is set as spherical.
Preferably, the plane mirror is the plane mirror of Double sided mirror setting.
It preferably, further include first motor and the first encoder, the both ends at the scanning means midpoint are respectively arranged with branch
Ear, one of trunnion are connected with first motor, another trunnion is connected with the first encoder, sphere where the wave transparent shell
The centre of sphere be arranged on the axis of trunnion, the scanning means is adjusted by first motor and the first encoder around horizontal direction.
It preferably, further include rack, second encoder and the second motor, the rack is inverted U rack, including curved portion
With parallel symmetrical vertical portion, through-hole, the trunnion stationary phase of the through-hole and scanning means are respectively arranged on the vertical portion
Even, the curved portion is provided with connecting rod far from one end of vertical portion, and the second encoder passes through the second motor and connecting rod
It is connected, the scanning means is adjusted by the second motor and second encoder around vertical direction.
Preferably, convex lens is contained at least one in the THz wave converging device.
Preferably, the THz wave converging device includes two convex lenses, respectively upper convex lens and lower convex lens.
Preferably, the center of circle of the plane mirror, upper convex lens and lower convex lens is respectively positioned in same vertical axis.
Preferably, the radius of curvature of the upper convex lens is 1500mm, and the radius of curvature of lower convex lens is 750mm.
The utility model compared with the existing technology, achieves technical effect below:
The composite rotating of horizontal axis and vertical axis of the utility model by using plane mirror in face moves
Completing the point by point scanning to measured object realizes 360 ° of horizontal direction scannings during the scanning process, and scanning range is big, imaging view
Wild big, due to rotate around central axis, revolving speed is fast, also moves without acceptance of persons and eccentric shaking；It is provided with outside plane mirror
Wave shell, when can be greatly reduced scanning caused by windage, scanning speed can be accelerated, wave transparent shell is set as spherical shape can be better
Rotation scans more smooth；Plane mirror uses two-sided setting, scans THz wave compared with same volume multi-panel drum-type when scanning
Light-inletting quantity is bigger, and image quality is more preferable；Using biconvex lens different focal length, so that optical path is more flexible in placement process, give
Machine minimizes with convenience, and more conducively for design, assembly, debugging.
Detailed description of the invention
FIG. 1 is a schematic structural view of the utility model.
Fig. 2 is the utility model scanning optical path schematic diagram.
Fig. 3 is that the utility model scans track schematic diagram.
Appended drawing reference: 1- terahertz detection device；Convex lens under 2-；The upper convex lens of 3-；4- plane mirror；5- first is compiled
Code device；6- rack；The second motor of 7-；8- second encoder；9- wave transparent shell；10- first motor.
Specific embodiment
Embodiment 1.
The utility model provides a kind of Terahertz scanning imaging system based on passive type, including sets gradually from top to bottom
Scanning means, THz wave converging device and terahertz detection device 1；THz wave converging device is for converging scanning means
The THz wave of reflection, and being sent in terahertz detection device 1, the scanning means can be around horizontal directions or/and perpendicular
For histogram to rotation, the scanning means includes plane mirror 4 and wave transparent shell 9.
The plane mirror 4 is arranged in wave transparent shell 9, and fastens and be connected.
The wave transparent shell 9 is set as spherical.
The plane mirror 4 is the plane mirror of Double sided mirror setting.
It further include first motor 10 and the first encoder 5, the both ends at the scanning means midpoint are respectively arranged with trunnion,
In a trunnion be connected with first motor 10, another trunnion is connected with the first encoder 5, the 9 place sphere of wave transparent shell
The centre of sphere be arranged on the axis of trunnion, the scanning means is by first motor 10 and the first encoder 5 around horizontal direction tune
Section.
Further include rack 6, second encoder 8 and the second motor 7, the rack 6 is inverted U rack, including curved portion and
The vertical portion of Parallel Symmetric, is respectively arranged with through-hole on the vertical portion, and the trunnion of the through-hole and scanning means is fixedly linked,
The curved portion is provided with connecting rod far from one end of vertical portion, and the second encoder 8 passes through the second motor 7 and connecting rod phase
Even, the scanning means is adjusted by the second motor 7 and second encoder 8 around vertical direction.
The Terahertz electric wave that testee issues is scanned device scanning, and during the scanning process, first motor 10 drives
Plane mirror 4 makes rotating motion around horizontal direction, and the first encoder 5 records the rotation angle of its horizontal direction, the second electricity
Machine 7 drives rack 6 to make rotating motion around vertical direction, to drive plane mirror 4 to move together, while second encoder 8
The rotation angle for recording its vertical direction, the 360 ° omni-directional for being able to achieve upper and lower complete scan and horizontal direction in this way are swept
Retouch, while plane mirror 4 is due to using two-sided setting, one circle of rotation can scan the THz wave that scans so twice into
Light quantity is bigger, the better quality of imaging, and the THz wave after the completion of scanning, which is reflected into convex lens, to be converged, after the completion of convergence
The arranged beneath terahertz detector 1 as corresponding to concave lens focus is completed signal and is received.
Embodiment 2.
The present embodiment is the improvement done on the basis of embodiment 1, in THz wave converging device described in the present embodiment extremely
It less include a convex lens.The THz wave converging device includes two convex lenses, respectively upper convex lens 3 and lower convex lens
2.The center of circle of the plane mirror 4, upper convex lens 3 and lower convex lens 2 is respectively positioned in same vertical axis.
Only need to consider by using the arrangement of biconvex lens, when wherein designing the curvature of upper convex lens 3 and measured object away from
From (i.e. object distance), and the location arrangements of terahertz detector 1 are mainly determined by the curvature of lower convex lens 2, make lower convex lens 2 in this way
Distance to terahertz detector 1 can be more flexible, by the different focal length of biconvex lens, so that light path arrangement is cleverer
It is living, and seem more convenient in design, assembly, debugging.
Embodiment 3.
This example is the improvement done on the basis of embodiment 2, and the radius of curvature of upper convex lens 3 described in this example is
1500mm, the radius of curvature of lower convex lens 2 are 750mm.
The radius of curvature of upper convex lens 3 is 1500mm in the utility model, then focal length is that 1434mm(is obtained by emulation),
So measured object is conducive to control measured object to machine to the requirement distance about 1434mm between upper convex lens 3 when Scanning Detction
The distance of device, it is excessively close apart from machine to be unlikely to measured object.The THz wave that measured point issues is formed flat after upper convex lens 3
Capable or class parallel rays converges at terahertz detector 1 by the refraction of lower convex lens 2.Lower convex lens 2 selects curvature half
The lesser lens of diameter, focal length is smaller, is conducive to machine minification, the lens of 750mm radius of curvature are used in the utility model,
Its focal length 678mm(emulation obtains).Due to being directional light between two lens, changing two lens, respectively radius of curvature there is not other side
Have an impact, so arrangement is more flexible.
Embodiment 4
The present embodiment is the improvement done on the basis of embodiment 1 or 2 or 3, and terahertz detection device 1 can be set to several
It is a, imaging effect can be improved.
Claims (10)
1. a kind of Terahertz scanning imaging system based on passive type, which is characterized in that swept including what is set gradually from top to bottom
Imaging apparatus, THz wave converging device and terahertz detection device (1)；THz wave converging device is anti-for converging scanning means
The THz wave penetrated, and being sent in terahertz detection device (1), the scanning means can be around horizontal directions or/and perpendicular
For histogram to rotation, the scanning means includes plane mirror (4) and wave transparent shell (9).
2. a kind of Terahertz scanning imaging system based on passive type according to claim 1, which is characterized in that the plane
Reflecting mirror (4) setting fastens and is connected in wave transparent shell (9).
3. a kind of Terahertz scanning imaging system based on passive type according to claim 2, which is characterized in that the wave transparent
Shell (9) is set as spherical.
4. a kind of Terahertz scanning imaging system based on passive type according to claim 1 or claim 2, which is characterized in that described
Plane mirror (4) be Double sided mirror setting plane mirror.
5. a kind of Terahertz scanning imaging system based on passive type according to claim 1, which is characterized in that further include
One motor (5) and the first encoder (10), the both ends at the scanning means midpoint are respectively arranged with trunnion, one of trunnion with
First motor (5) is connected, another trunnion is connected with the first encoder (10), the centre of sphere of sphere where the wave transparent shell (9)
It is arranged on the axis of trunnion, the scanning means is adjusted by first motor (5) and the first encoder (10) around horizontal direction.
6. a kind of Terahertz scanning imaging system based on passive type according to claim 1, which is characterized in that further include machine
Frame (6), second encoder (8) and the second motor (7), the rack (6) are inverted U rack, including curved portion and Parallel Symmetric
Vertical portion, be respectively arranged with through-hole on the vertical portion, the trunnion of the through-hole and scanning means is fixedly linked, the arc
Portion is provided with connecting rod far from one end of vertical portion, and the second encoder (8) is connected by the second motor (7) with connecting rod,
The scanning means is adjusted by the second motor (7) and second encoder (8) around vertical direction.
7. a kind of Terahertz scanning imaging system based on passive type according to claim 1, which is characterized in that the terahertz
Hereby convex lens is contained at least one in wave converging device.
8. a kind of Terahertz scanning imaging system based on passive type according to claim 1, which is characterized in that the terahertz
Hereby wave converging device includes two convex lenses, respectively upper convex lens (3) and lower convex lens (2).
9. a kind of Terahertz scanning imaging system based on passive type according to claim 1 or 8, which is characterized in that described
The center of circle of plane mirror (4), upper convex lens (3) and lower convex lens (2) is respectively positioned in same vertical axis.
10. a kind of Terahertz scanning imaging system based on passive type according to claim 9, which is characterized in that on described
The radius of curvature of convex lens (3) is 1500mm, and the radius of curvature of lower convex lens (2) is 750mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562948A (en) * | 2018-06-08 | 2018-09-21 | 西安天和防务技术股份有限公司 | A kind of Terahertz scanning imaging system based on passive type |
| CN110031907A (en) * | 2019-04-18 | 2019-07-19 | 西安天和防务技术股份有限公司 | Optical mechaical scanning imaging system |
-
2018
- 2018-06-08 CN CN201820884579.6U patent/CN208239636U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562948A (en) * | 2018-06-08 | 2018-09-21 | 西安天和防务技术股份有限公司 | A kind of Terahertz scanning imaging system based on passive type |
| CN110031907A (en) * | 2019-04-18 | 2019-07-19 | 西安天和防务技术股份有限公司 | Optical mechaical scanning imaging system |
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