CN107741607A - A kind of simple detector quickly scans terahertz imaging system - Google Patents
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- CN107741607A CN107741607A CN201710947317.XA CN201710947317A CN107741607A CN 107741607 A CN107741607 A CN 107741607A CN 201710947317 A CN201710947317 A CN 201710947317A CN 107741607 A CN107741607 A CN 107741607A
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- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000009659 non-destructive testing Methods 0.000 abstract description 3
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
- G01V8/18—Detecting, e.g. by using light barriers using one transmitter and one receiver using mechanical scanning systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
- G01V8/14—Detecting, e.g. by using light barriers using one transmitter and one receiver using reflectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N2021/1765—Method using an image detector and processing of image signal
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Abstract
The present invention provides a kind of simple detector and quickly scans terahertz imaging system, including terahertz detector, focusing mirror, rotating mirror, rotating mirror rotating shaft, swinging mirror and terahertz emission source;The terahertz emission source sends THz wave to the object to be imaged;The THz wave of the object to be imaged radiation or reflection is reflected by swinging mirror, rotating mirror and focusing mirror successively, reaches terahertz detector and completes imaging.Simple detector proposed by the present invention quickly scans THz imaging technology, in the case where only using a terahertz detector, coordinates and rotates speculum and pendular reflex scarnning mirror, it is possible to achieve the quick imaging effect of low cost.Effectively solving two-dimentional machinery scanning in existing terahertz imaging system, time-consuming, synthetic aperture imaging algorithm is complicated and aperture synthesis is imaged the shortcomings of cost is high.It can be widely used in fields such as Terahertz safety check, Terahertz Non-Destructive Testing and terahertz imaging radars.
Description
Technical field
The present invention relates to technical field of imaging, particularly a kind of simple detector quickly scans terahertz imaging system.
Background technology
Terahertz emission is last untapped frequency range in electromagnetic spectrum, its frequency be located at microwave and it is infrared it
Between.Compared with microwave, the frequency of terahertz emission is higher, therefore can carry more information content when as communication carrier,
For visible ray and near-infrared ripple, the wavelength of terahertz emission is longer, it is not easy to suspension or cigarette in by air
The scattering of mist influences, the complementary light source being likely to become in the case of these.Compared with X ray, its photon energy body is low, will not be to life
Thing tissue produces ionization damage, is the excellent means for studying biological tissue.In addition, THz wave is very easy to penetrate various clothing
Thing, it is the effective means for human body be imaged safety check.
Because terahertz emission has the advantages of so many, various countries scientific research personnel has put into substantial amounts of energy to Terahertz
Radiation is studied.By fast development in recent years, in tera-hertz spectra, Terahertz communication, Terahertz radar and Terahertz
The fields such as imaging achieve important progress.Particularly terahertz imaging, obtained in the field such as Non-Destructive Testing and safety check
Preliminary application.
Relative to the electromagnetic wave of other frequency ranges, the research to Terahertz Technology both at home and abroad falls behind relatively, particularly Terahertz
Detector is very expensive, and there is presently no the commercialized two-dimentional terahertz detector array as optical CCD.For terahertz
Hereby scanning imagery, currently used method are that terahertz detector is placed on to progress two-dimentional machinery on the focal plane of optical system to sweep
The mode retouched is imaged, although this mode only needs a terahertz detector, two-dimentional machinery scanning is very time-consuming, far
The remote requirement for not reaching practical application.Another way is to use one-dimensional terahertz detector array, on another latitude
Using mechanical scanning.Although this mode improves image taking speed, but the cost of one-dimensional terahertz detector array greatly increases,
Can not meet the needs of practical application in cost.
Because THz imaging technology has unique application prospect in many fields, so there are various systems too
Hertz imaging system, mainly has:1. quasi-optics focal plane imaging scanning imagery, this imaging mode by terahertz detector or by
Imaging object is arranged on mechanical scanning frame and carries out two-dimensional scan, and this mode is simple in construction, but image taking speed is slow.In order to improve
Speed can take one-dimensional terahertz detector array, carry out mechanical scanning on one-dimensional in addition, but this mode increases
Cost is added.2. synthetic aperture imaging, the terahertz detector quantity that this imaging mode needs is few, and cost is low, but technology
Complexity, particularly image reconstruction algorithm difficulty is big, and time-consuming.3. aperture synthesis is imaged, this mode will use more detection
Device quantity, cost are higher.
The content of the invention
The invention aims to solve to be imaged in the prior art, cost is high, slow-footed defect, there is provided a kind of single to visit
Survey device and quickly scan terahertz imaging system to solve the above problems.
To achieve these goals, technical scheme is as follows:
A kind of simple detector quickly scans terahertz imaging system, including at least one terahertz detector, focusing reflection
Mirror, rotating mirror, rotating mirror rotating shaft, swinging mirror and terahertz emission source;The terahertz emission source to by into
As object sends THz wave;The THz wave of the object to be imaged radiation or reflection is anti-by swinging mirror, rotation successively
Mirror and focusing mirror reflection are penetrated, terahertz detector is reached and completes imaging.
Preferably, swinging mirror swings back and forth around its rotating shaft;The rotating shaft of swinging mirror is located in reflecting surface.
Preferably, rotating mirror continuously rotates around its rotating shaft, and the rotating shaft of rotating mirror and normal have an angle theta, folder
Angle θ size is determined by the imaging viewing field needed.
Preferably, the scanning track when rotating mirror rotates is a circle, the scanning rail of the swinging mirror
Mark is straight line, and the scanning track of the rotating mirror and swinging mirror is superimposed the spiral to be formed in a two dimensional surface
Line, so as to complete two-dimensional imaging scanning to the object to be imaged.
Preferably, the rotating mirror continuously rotates around its rotating shaft, and the swinging mirror swings back and forth around its rotating shaft,
One way, which is swung, completes width imaging, the completion two width imaging that swings back and forth.
Preferably, the rotating mirror and swinging mirror can be with the position of terahertz imaging optical system or order
Exchange, the function without influenceing imaging system..
The present invention compared with prior art, has the advantages that:
Simple detector proposed by the present invention quickly scans THz imaging technology, is only using terahertz detector
In the case of, coordinate and rotate speculum and pendular reflex scarnning mirror, it is possible to achieve the quick imaging effect of low cost.It is effective to solve
Time-consuming, synthetic aperture imaging algorithm is complicated and aperture synthesis imaging cost for two-dimentional machinery scanning in existing terahertz imaging system
The shortcomings of high.It can be widely used in fields such as Terahertz safety check, Terahertz Non-Destructive Testing and terahertz imaging radars.
Brief description of the drawings
Fig. 1 is the structural representation that a kind of simple detector that the embodiment of the present invention 1 provides quickly scans terahertz imaging system
Figure;
Fig. 2 is the structural representation that a kind of simple detector that the embodiment of the present invention 2 provides quickly scans terahertz imaging system
Figure;
Fig. 3 is that a kind of simple detector of offer provided by the invention quickly scans terahertz imaging system scanning track signal
Figure.
Embodiment
The effect of to make to architectural feature of the invention and being reached, has a better understanding and awareness, to preferable
Embodiment and accompanying drawing coordinate detailed description, are described as follows:
Embodiment 1
As shown in figure 1, the terahertz imaging system in the present invention is as shown in Figure 1, including terahertz detector 1, focusing
Speculum 2, rotating mirror 3, rotating mirror rotating shaft 4, swinging mirror 5 and terahertz emission source 7 form.The object to be imaged
The THz wave of 6 radiation or reflection is reflected by swinging mirror 5, rotating mirror 4 and focusing mirror 2 successively, reaches terahertz
Hereby detector 1 completes imaging.
In the present invention, rotating mirror 3 continuously rotates around its rotating shaft, and the rotating shaft of rotating mirror 3 and normal have a folder
Angle θ, the size of angle theta are determined by the imaging viewing field needed.Swinging mirror 5 swings back and forth around its rotating shaft, and amplitude of fluctuation is by needing
The imaging viewing field wanted determines that the rotating shaft of swinging mirror 5 is located in reflecting surface.
Scanning track when rotating mirror 3 continuously rotates is a circle, and the scanning track of swinging mirror 5 is straight for one
The scanning track of line, rotating mirror 3 and swinging mirror 5 is superimposed the helix to be formed in a two dimensional surface, so as to quilt
Imaging object 6 completes two-dimensional imaging scanning, as shown in Figure 3.
This imaging system work when, rotating mirror 3 continuously rotates around its rotating shaft, swinging mirror 5 around its rotating shaft back and forth
Swing, an one way, which is swung, completes width imaging, the completion two width imaging that swings back and forth.
Focusing mirror 2, rotating mirror 3 and swinging mirror 5 are process using light metal alloys.Work as use
When focusing on the replacement focusing mirror 2 of convex lens 8, focus on convex lens and be process using the transparent dielectric material of terahertz wave band.
When safety check instrument is operated in aggressive mode, the personnel of being detected are irradiated using terahertz detector 7.When being operated in Passive Mode, do not adopt
Irradiated with terahertz detector 7, only detect the Terahertz THz wave process imaging of human body itself radiation.
The operating of motor driving rotating mirror 3 and swinging mirror 5 is respectively adopted.
The control centre of whole imaging system is used computer as, the function of control centre mainly includes:
1. control the operating of rotating mirror 3 and swinging mirror 5.
2. the terahertz signal that collection terahertz detector 7 detects.
3. pair terahertz signal collected is processed and displayed, visual picture is formed, shows what the person carried
Various articles, so as to reach the purpose of safety inspection.
Embodiment 2
As shown in Fig. 2 focusing mirror 2 can be substituted by focusing convex lens 8, the function without influenceing imaging system.
The present invention in addition to it can reach the purpose of fast imaging in the case where only using a terahertz detector,
Also have the following advantages:
1. the quantity of terahertz detector 1 can be increased, to reach the purpose for improving image taking speed.
2. rotating mirror 3 and swinging mirror 5 can exchange in the position of terahertz imaging optical system or order, and
The function of imaging system is not influenceed.
3. focusing mirror 2 can be substituted by focusing convex lens 8, the function without influenceing imaging system.
4. an imaging system is not only used in terahertz wave band, after corresponding detector is changed, it can also be used to can
See other electromagnetic wave bands such as light and microwave.
5. the imaging system can be operated in aggressive mode and Passive Mode.When being operated in aggressive mode, using Terahertz spoke
Penetrate source 7 and irradiate the object to be imaged 6.When being operated in Passive Mode, do not use terahertz emission source 7 to irradiate the object to be imaged 6, utilize
The THz wave of the object to be imaged 6 itself radiation is imaged.
The present invention can carry out safety check as terahertz imaging safety check instrument in the case where not contacting detected personnel, detect
The material that the person carries has metal, ceramics, plastics, liquid and powder etc., and detectable article includes explosive, drugs, gun
With cutter etc., safety check effect is played and significantly lifted.Relative to traditional rays safety detection apparatus, this safety check instrument have it is quick, reliable,
The advantages that safety and protection privacy.
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
For personnel it should be appreciated that the present invention is not limited to the above embodiments, that described in above-described embodiment and specification is the present invention
Principle, various changes and modifications of the present invention are possible without departing from the spirit and scope of the present invention, these change and
Improvement is both fallen within the range of claimed invention.The protection domain of application claims by appended claims and its
Equivalent defines.
Claims (6)
1. a kind of simple detector quickly scans terahertz imaging system, it is characterised in that:Including at least one terahertz detector
(1), focusing mirror (2), rotating mirror (3), rotating mirror rotating shaft (4), swinging mirror (5) and terahertz emission source
(7);The terahertz emission source (7) sends THz wave to the object to be imaged (6);The object to be imaged (6) radiation or anti-
The THz wave penetrated is reflected by swinging mirror (5), rotating mirror (4) and focusing mirror (2) successively, reaches Terahertz and visits
Survey device (1) and complete imaging.
2. simple detector according to claim 1 quickly scans terahertz imaging system, it is characterised in that:Swinging mirror
(5) swung back and forth around its rotating shaft;The rotating shaft of swinging mirror (5) is located in reflecting surface.
3. simple detector according to claim 1 quickly scans terahertz imaging system, it is characterised in that:Rotating mirror
(3) continuously rotated around its rotating shaft, the rotating shaft of rotating mirror (3) and normal have an angle theta, the size of angle theta by need into
As visual field determines.
4. simple detector according to claim 1 quickly scans terahertz imaging system, it is characterised in that:The rotation is anti-
It is a circle to penetrate scanning track when mirror (3) rotates, and the scanning track of the swinging mirror (5) is straight line, the rotation
The scanning track for turning speculum (3) and swinging mirror (5) is superimposed the helix to be formed in a two dimensional surface, so as to described
The object to be imaged (6) completes two-dimensional imaging scanning.
5. simple detector according to claim 1 quickly scans terahertz imaging system, it is characterised in that:The rotation is anti-
Penetrate mirror (3) continuously to rotate around its rotating shaft, the swinging mirror (5) swings back and forth around its rotating shaft, and an one way, which is swung, completes one
Width is imaged, the completion two width imaging that swings back and forth.
6. simple detector according to claim 1 quickly scans terahertz imaging system, it is characterised in that:The rotation is anti-
Penetrating mirror (3) and swinging mirror (5) can exchange in the position of terahertz imaging optical system or order, without influenceing imaging system
The function of system.
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Cited By (7)
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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 |
CN109297932A (en) * | 2018-08-29 | 2019-02-01 | 北京遥感设备研究所 | A kind of quasi-optical servo scarnning mirror continuous wave reflection imaging system of Terahertz |
CN110806590A (en) * | 2019-11-14 | 2020-02-18 | 中国科学院电子学研究所 | Terahertz active and passive composite imaging quasi-optical scanning system |
CN111273286A (en) * | 2020-01-21 | 2020-06-12 | 中国科学院电子学研究所 | Imaging device, method, electronic apparatus, and storage medium |
CN111505629A (en) * | 2020-05-08 | 2020-08-07 | 中国科学院国家空间科学中心 | Terahertz security inspection imaging system and method |
CN111856025A (en) * | 2019-04-29 | 2020-10-30 | 中国人民解放军军事科学院军事医学研究院 | Neuronal synaptosomal protein SYN sensitive to terahertz wave radiation |
CN113381818A (en) * | 2021-06-08 | 2021-09-10 | 浙江大学 | Spiral scanning method for terahertz wave beam alignment |
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Cited By (9)
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 |
CN109297932A (en) * | 2018-08-29 | 2019-02-01 | 北京遥感设备研究所 | A kind of quasi-optical servo scarnning mirror continuous wave reflection imaging system of Terahertz |
CN111856025A (en) * | 2019-04-29 | 2020-10-30 | 中国人民解放军军事科学院军事医学研究院 | Neuronal synaptosomal protein SYN sensitive to terahertz wave radiation |
CN111856025B (en) * | 2019-04-29 | 2024-03-19 | 中国人民解放军军事科学院军事医学研究院 | Neuronal synaptobrevin protein SYN sensitive to terahertz-wave radiation |
CN110806590A (en) * | 2019-11-14 | 2020-02-18 | 中国科学院电子学研究所 | Terahertz active and passive composite imaging quasi-optical scanning system |
CN110806590B (en) * | 2019-11-14 | 2021-11-26 | 中国科学院电子学研究所 | Terahertz active and passive composite imaging quasi-optical scanning system |
CN111273286A (en) * | 2020-01-21 | 2020-06-12 | 中国科学院电子学研究所 | Imaging device, method, electronic apparatus, and storage medium |
CN111505629A (en) * | 2020-05-08 | 2020-08-07 | 中国科学院国家空间科学中心 | Terahertz security inspection imaging system and method |
CN113381818A (en) * | 2021-06-08 | 2021-09-10 | 浙江大学 | Spiral scanning method for terahertz wave beam alignment |
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