CN107741607A - A kind of simple detector quickly scans terahertz imaging system - Google Patents

A kind of simple detector quickly scans terahertz imaging system Download PDF

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Publication number
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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China
Prior art keywords
mirror
terahertz
imaging
imaging system
swinging
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CN201710947317.XA
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Chinese (zh)
Inventor
冯辉
武帅
高炳西
卜伟华
王文静
齐登刚
靖红军
韦巍
高广东
刘海建
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Bo Bo Anhui Mdt Infotech Ltd
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Bo Bo Anhui Mdt Infotech Ltd
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Priority to CN201710947317.XA priority Critical patent/CN107741607A/en
Publication of CN107741607A publication Critical patent/CN107741607A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00Prospecting or detecting by optical means
    • G01V8/10Detecting, e.g. by using light barriers
    • G01V8/12Detecting, e.g. by using light barriers using one transmitter and one receiver
    • G01V8/18Detecting, e.g. by using light barriers using one transmitter and one receiver using mechanical scanning systems
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3581Investigating 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S13/00Systems 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
    • G01S13/88Radar or analogous systems specially adapted for specific applications
    • G01S13/89Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00Prospecting or detecting by optical means
    • G01V8/10Detecting, e.g. by using light barriers
    • G01V8/12Detecting, e.g. by using light barriers using one transmitter and one receiver
    • G01V8/14Detecting, e.g. by using light barriers using one transmitter and one receiver using reflectors
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N2021/1765Method using an image detector and processing of image signal

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Analytical Chemistry (AREA)
  • Geophysics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Toxicology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

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

A kind of simple detector quickly scans terahertz imaging system
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.
CN201710947317.XA 2017-10-12 2017-10-12 A kind of simple detector quickly scans terahertz imaging system Pending CN107741607A (en)

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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)

* Cited by examiner, † Cited by third party
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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Application publication date: 20180227

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