CN102681022B - Terahertz (THz) wave imaging device - Google Patents
Terahertz (THz) wave imaging device Download PDFInfo
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- CN102681022B CN102681022B CN201210117301.3A CN201210117301A CN102681022B CN 102681022 B CN102681022 B CN 102681022B CN 201210117301 A CN201210117301 A CN 201210117301A CN 102681022 B CN102681022 B CN 102681022B
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Abstract
The invention discloses a terahertz (THz) wave imaging device, comprising a polyhedral rotating mirror, a THz lens and a detection unit. Plane mirrors are arranged on the side surfaces of the polyhedral rotating mirror in different angles, so that the scanning and imaging column number of a detected target is increased, the imaging quality and speed are improved, and meanwhile, the system is more real-time and practical in body scanning and imaging for a security check. The two-dimensional multi-column scanning of the detected target is implemented in a large range only by driving the polyhedral rotating mirror to rotate, so that the structure of a scanning and imaging device is simplified and the cost is lowered.
Description
Technical field
The present invention relates to THz wave scanning imaging technology, specifically the present invention relates to the human body THz wave scanned imagery device of a kind of high frame frequency that utilizes ripple scanning and linear array detector to combine, large visual field.
Background technology
THz wave between microwave and infrared between, the materials such as plastics, the scraps of paper, textile and leather are had to good penetrability, shorter than microwave wavelength, become image to there is higher spatial resolution; Than the low a plurality of orders of magnitude of X ray energy, to biological tissue, can not cause ionization damage, therefore, terahertz imaging device has practicality in human body safety check, can form effective supplement with traditional rays safety detection apparatus.
At present, be subject to the restriction of material and processing technology, the sensitive detection parts of terahertz wave band involve great expense, and in terahertz imaging, also cannot adopt focal plane imaging, mostly adopt scanning imagery.In scanning imagery, pointwise mechanical scanning overlong time, cannot be applied to actual safety check place.In adopting optical mechaical scanning imaging system, owing to being subject to the restriction of detector, adopt the optical mechaical scanning imaging of single detector in order to guarantee detector sensitivity, imaging time cannot reach video frame frequency.Therefore adopt THz wave scan imaging method that linear array detector and optical mechaical scanning combine can meet the demand of the required high frame frequency of human body safety check, large visual field.
In the THz wave scanned imagery device of existing employing linear array detector, for increase with linear array detector orientation on pixel count, need to adopt frame to sweep level crossing along the orientation of the linear array probe unit scanning that significantly swings back and forth, the introducing that frame is swept level crossing has reduced sweep velocity and image quality, has also increased the complicacy of imaging device.
Summary of the invention
In view of this, the invention provides a kind of THz wave imaging device, can at terahertz wave band, carry out scanning imagery to measured target, improve sweep velocity, reduce imaging device complicacy Enhanced Imaging quality simultaneously.
A kind of THz wave imaging device of the present invention, comprises polygonal-mirror, Terahertz lens and Terahertz linear array detector;
The THz wave of measured target institute's radiation or reflection is reflexed on described Terahertz lens by described polygonal-mirror, through after the converging of Terahertz lens, by Terahertz linear array detector, is received;
Described polygonal-mirror by a plurality of level crossings around forming, polygonal-mirror can rotate around the axis, the linear variation of angular dimension between all level crossings and rotating shaft, by each level crossing in turn as the reflecting surface of measured target, make measured target Terahertz lens as plane on imaging move in the horizontal direction.
Described polygonal-mirror comprises positive N face body support frame and N level crossing; On each side of positive N face body support frame, a level crossing is all set, the angle between all level crossings and the rotating shaft of positive N face body support frame is uniformly-spaced increased successively, and Symmetrical distributes centered by 0 degree; The central shaft of positive N face body support frame is as the rotating shaft of polygonal-mirror, and polygonal-mirror is placed on the place ahead of measured target, and the central shaft that makes polygonal-mirror is in surface level and parallel with the object plane at measured target place; On polygonal-mirror, become the level crossing at 0 ° of angle to be designated as level crossing A with side, place;
Described N gets 3 or 5;
Described Terahertz lens are placed in the reflected light path of polygonal-mirror, and when level crossing A and measured target angle at 45 °, the geometric center point of measured target projects in the geometric center of Terahertz lens after the reflection of level crossing A;
Described Terahertz linear array detector at least comprises 2 probe units, and all probe units in Terahertz linear array detector are uniformly distributed on the horizontal center line as plane of measured target.
In described polygonal-mirror, be designated as level crossing B with a level crossing of side, place angulation negative sense maximum, in polygonal-mirror, be designated as level crossing C with a level crossing of side, place angulation forward maximum, when polygonal-mirror forwards level crossing C to from plane B, measured target Terahertz lens as plane on imaging move Terahertz linear array detector in two adjacent probe units spacing.
This device also comprises for the THz wave direction of Terahertz lens transmission being changed to the catoptron of 90 °.
Described Terahertz lens will guarantee that imaging viewing field covers the horizontal cross scope of measured target, and to select tolerance frequency scope be that the materials processing that the THz wave of 0.1THz-10THz is passed through forms.
Catoptron, polygonal-mirror, Terahertz lens and Terahertz linear array detector are all encapsulated in box body, and the imaging window that can allow THz wave to see through is installed on the box body between measured target and polygonal-mirror.
This device also comprises that frequency range is 0.1THz-10THz terahertz emission source, for measured target is thrown light on.
A kind of THz wave imaging device of the present invention has following beneficial effect:
By will the level crossing that angle is different being set on the side of polygonal-mirror, the columns of increase to the scanning imagery of measured target, improved image quality and image taking speed, increased this system simultaneously and human body is carried out real-time, the practicality of scanning imagery in human body safety check;
Only by driving polygonal-mirror rotation just to realize, the large-scale two-dimentional multiple row of measured target is scanned, thereby simplified the structure of scanned imagery device, reduce costs.
Accompanying drawing explanation
Fig. 1. the schematic side view of a kind of THz wave imaging device of the present invention;
Fig. 2. the axis side views such as the trihedral scanning mirror in one embodiment of the present of invention;
Fig. 3. the rotation schematic diagram of the trihedral tilting mirror in one embodiment of the present of invention;
Fig. 4. the principle schematic of the imaging device of an embodiment in the present invention.
Wherein, 1-measured target, 2-imaging window, 3-polygonal-mirror, 3-1-level crossing, the positive N face of 3-2-body support frame, 4-Terahertz lens, 5-catoptron, 6-probe unit.
Embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
The invention provides a kind of THz wave imaging device, for the terahertz imaging safety check of human body, as shown in Figure 1, this device comprises polygonal-mirror 3, Terahertz lens 4 and Terahertz linear array detector;
The THz wave of 1 radiation of measured target or reflection is reflexed on Terahertz lens 4 by polygonal-mirror 3, through after the converging of Terahertz lens 4, is received by Terahertz linear array detector again;
In order to reduce the center of gravity of scanned imagery device, improve device stability, the present invention adopts a catoptron 5 with measured target 1 angle at 45 °, for the THz wave direction of Terahertz lens 4 transmissions is changed to 90 °, make Terahertz linear array detector become horizontal direction from original vertical direction and receive THz wave.
Polygonal-mirror 3 when rotating, by each side in turn as the reflecting surface of measured target 1, make measured target 1 Terahertz lens 4 as plane on imaging move in the horizontal direction.
According to the structural principle of said apparatus, when polygonal-mirror 4 rotates, measured target 1 is when moving on surface level as plane imaging, probe unit 6 just can receive and be different from former measured target 1 pixel data in the horizontal direction, thus, the in the situation that of not mobile probe unit 6 and other device of increase, just can receive the image information on more measured target 1; Than prior art, only require that polygonal-mirror 3 rotations with a plurality of reflectings surface just can detect more pixel datas, so the device that the present invention adopts is more simple compact, has higher practical value.
It should be noted that, Terahertz linear array detector can be surveyed a row pixel of measured target 1, when polygonal-mirror 3 rotates, multiple row pixel can be sent in Terahertz linear array detector, has realized object of the present invention.Therefore, increase the probe unit 6 in Terahertz linear array detector, will make the Terahertz linear array detector can the more pixel of disposable detection, when polygonal-mirror 3 rotates, the pixel detecting will increase greatly, therefore the rarest probe unit 6 in Terahertz linear array detector, also can select quantity by actual needs.
In order to realize conveniently, polygonal-mirror 3 comprises positive N face body support frame 3-1 and N level crossing 3-2; On each side of positive N face body support frame 3-1, a level crossing 3-2 is all set, N gets 3,5,6 or more; The central shaft of N face body support frame 3-1 is as the rotation axis of polygonal-mirror 3; Angle between all level crossing 3-2 and the central shaft of positive N face body support frame 3-1 is uniformly-spaced increased successively, and Symmetrical distribute centered by 0 degree; Polygonal-mirror 3 is placed on the place ahead of measured target 1, and the central shaft that makes polygonal-mirror 3 is in surface level and parallel with the object plane of measured target 1; On polygonal-mirror 3, become the level crossing 3-2 at 0 ° of angle to be designated as level crossing A with side, place.
It should be noted that, polygonal-mirror 3 is not limited to above-mentioned described position relationship with the position relationship of measured target 1, the position of foregoing description is that a ratio is easier to the mode realizing, the rotation axis of polygonal-mirror 3 can be not parallel with measured target 1, the angle of the level crossing 3-2 arranging on the direction of rotation axis and polygonal-mirror 3 has relation, but as long as both follow following principle: guarantee to make measured target 1 imaging on as plane to move in the horizontal direction when polygonal-mirror 3 rotates, make Terahertz linear array detector detect more pixel data, just can complete object of the present invention.
In order to realize the best effects of Terahertz lens 4, according to conventional technological means, Terahertz lens 4 are placed in to the reflected light path of polygonal-mirror 3, when level crossing A and measured target 1 angle at 45 °, the geometric center point of measured target 1 projects in the geometric center of Terahertz lens 4 after the reflection of level crossing A; Simultaneously and will guarantee that the imaging viewing field of Terahertz lens 4 can cover the horizontal cross scope of measured target, selecting tolerance frequency scope is that the materials processing that the THz wave of 0.1THz-10THz is passed through forms.
Terahertz linear array detector at least comprises 2 probe units 6, and all Terahertz detector arrays are uniformly distributed on the horizontal center line as plane of measured target 1.
For convenience of description, in polygonal-mirror 3, be designated as level crossing B with a level crossing 3-2 of side, place angulation negative sense maximum, in polygonal-mirror 3, be level crossing C with a level crossing 3-2 note of side, place angulation forward maximum, when polygonal-mirror 3 forwards level crossing C to from plane B, measured target 1 Terahertz lens 4 as plane on imaging move Terahertz linear array detector in the spacing of two adjacent probe units 6.
In order to prevent that dust and parasitic light etc. from entering into scanning system inside, catoptron 5, polygonal-mirror 3, Terahertz lens 4 and Terahertz linear array detector are all encapsulated in box body, and the imaging window 2 that can allow THz wave to see through is installed on the box body between measured target 1 and polygonal-mirror 3.
System of the present invention is available active THz wave scanning imagery also, and in active THz wave scanning imagery, throw light on to measured target in the terahertz emission source that selected frequency scope is 0.1THz-10THz.
The principle of work of THz wave imaging device of the present invention is: during scanning imagery, polygonal-mirror 3 rotates around it axle and carries out the stable rotation of high speed, when each level crossing 3-2 of polygonal-mirror 3 forwards in the light path at measured target 1 rear, capital completes multiple row rapid scanning to the vertical direction of measured target 1, the columns of scanning is consistent with the quantity of probe unit 6 in Terahertz linear array detector, as shown in Figure 4, in this example, suppose that on measured target 1, horizontal direction has 48 row pixels, the quantity of probe unit 6 is 16, therefore after each the level crossing 3-2 in polygonal-mirror 3 turns over, capital completes in vertical direction 16 column scans measured target 1.
In order to increase the scanning columns to measured target 1, increase the pixel count in the horizontal line of measured target 1, and each the level crossing 3-2 that makes full use of polygonal-mirror 3 carries out the scanning of different lines, in polygonal-mirror 3, between each level crossing 3-2 and the central shaft of positive N face body support frame, there is a small angle of inclination, as shown in Figure 3, the trihedral tilting mirror of take in the present embodiment is example, the central axes of the second level crossing and positive trihedral support, become-α of the central shaft angle of the first level crossing and positive trihedral support, the 3rd level crossing becomes α angle with the central shaft of positive trihedral support, the central shaft angulation of three level crossing 3-2 and positive trihedral support is spaced apart α angle.When rotating since the first level crossing, this level crossing completes the scanning to 16 row pixels on the vertical direction of measured target 1, and Terahertz detector array detects the pixel of circle representative in figure; When forwarding the second level crossing to, because the second level crossing becomes 0 degree angle with the rotary centerline of polyhedron support, therefore measured target 1 Terahertz lens 4 as plane on imaging move a small distance, each probe unit 6 in Terahertz detector array detects the pixel that row are new, i.e. the pixel of pentagram representative in figure; When the 3rd face scans, probe unit 6 detects again triangle represent pixel point, thus, when trihedral tilting mirror rotates a Zhou Houhui, completes 48 column scans to measured target 1, thereby forms the two-dimentional Terahertz image of measured target 1.
When increasing the quantity of the side of polygonal-mirror 3, can correspondingly increase the scanning columns of measured target 1, for guaranteeing that the caliber size of each level crossing 3-2 can detect whole measured target 1, increase the side quantity of polygonal-mirror 3, will correspondingly increase the volume of polygonal-mirror 3, this will give and drive polygonal-mirror 3 to bring very large difficulty, therefore selects trihedral tilting mirror and pentahedron tilting mirror comparatively suitable.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. a THz wave imaging device, is characterized in that, comprises polygonal-mirror (3), Terahertz lens (4) and Terahertz linear array detector;
It is upper that the THz wave of measured target (1) institute's radiation or reflection is reflexed to described Terahertz lens (4) by described polygonal-mirror (3), through after the converging of Terahertz lens (4), by Terahertz linear array detector, received;
Described polygonal-mirror (3) by a plurality of level crossings around forming, polygonal-mirror (3) can rotate around the axis, the linear variation of angular dimension between all level crossings and rotating shaft, by each level crossing in turn as the reflecting surface of measured target (1), make measured target (1) Terahertz lens (4) as plane on imaging move in the horizontal direction;
Described polygonal-mirror (3) comprises positive N face body support frame (3-1) and N level crossing (3-2); On each side of positive N face body support frame (3-1), a level crossing (3-2) is all set, the angle between all level crossings (3-2) and the rotating shaft of positive N face body support frame (3-1) is uniformly-spaced increased successively, and Symmetrical distributes centered by 0 degree; The central shaft of positive N face body support frame (3-1) is as the rotating shaft of polygonal-mirror (3), polygonal-mirror (3) is placed on the place ahead of measured target (1), and the central shaft that makes polygonal-mirror (3) is in surface level and parallel with the object plane at measured target (1) place; Polygonal-mirror (3) is upper becomes the level crossing (3-2) at 0 ° of angle to be designated as level crossing (A) with side, place;
Described N gets 3 or 5;
Described Terahertz lens (4) are placed in the reflected light path of polygonal-mirror (3), when level crossing (A) and measured target (1) angle at 45 °, the geometric center point of measured target (1) projects in the geometric center of Terahertz lens (4) after the reflection of level crossing (A);
Described Terahertz linear array detector at least comprises 2 probe units (6), and all probe units (6) are uniformly distributed on the horizontal center line as plane of measured target (1);
In polygonal-mirror (3), be designated as level crossing (B) with a level crossing (3-2) of side, place angulation negative sense maximum, in polygonal-mirror (3), be designated as level crossing (C) with a level crossing (3-2) of side, place angulation forward maximum, when polygonal-mirror (3) forwards level crossing (C) to from level crossing (B), measured target (1) Terahertz lens (4) as plane on imaging move Terahertz linear array detector in the spacing of (6) between two adjacent probe units;
Catoptron (5), polygonal-mirror (3), Terahertz lens (4) and Terahertz linear array detector are all encapsulated in box body, and the imaging window (2) that can allow THz wave to see through is installed on the box body between measured target (1) and polygonal-mirror (3);
Also comprise that frequency range is 0.1THz-10THz terahertz emission source, for measured target (1) is thrown light on.
2. a kind of THz wave imaging device as claimed in claim 1, is characterized in that, also comprises for the THz wave direction of Terahertz lens (4) transmission being changed to the catoptron (5) of 90 °.
3. a kind of THz wave imaging device as claimed in claim 1, it is characterized in that, described Terahertz lens (4) will guarantee that imaging viewing field covers the horizontal cross scope of measured target (1), and to select tolerance frequency scope be that the materials processing that the THz wave of 0.1THz-10THz is passed through forms.
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| CN201210117301.3A CN102681022B (en) | 2012-04-19 | 2012-04-19 | Terahertz (THz) wave imaging device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103257369B (en) * | 2013-04-15 | 2015-06-03 | 首都师范大学 | Total reflection type Terahertz-wave scanning imaging device |
| CN103575660B (en) * | 2013-11-05 | 2016-04-06 | 湖北久之洋红外***股份有限公司 | The THz wave scanning imaging system of Articles detecting and method on streamline |
| CN104914476A (en) * | 2015-07-01 | 2015-09-16 | 博康智能网络科技股份有限公司 | Rotary barrel type terahertz human body safety check scanning mechanism |
| CN104914477A (en) * | 2015-07-01 | 2015-09-16 | 博康智能网络科技股份有限公司 | Terahertz human body security check method |
| CN104914478A (en) * | 2015-07-01 | 2015-09-16 | 博康智能网络科技股份有限公司 | Terahertz human body safety check system and method |
| CN107728222B (en) * | 2017-09-01 | 2019-09-27 | 清华大学 | Active Terahertz safety check imaging method and system |
| CN108051868A (en) * | 2017-11-16 | 2018-05-18 | 欧必翼太赫兹科技(北京)有限公司 | Terahertz human body safety check imaging system |
| DE102018105352A1 (en) | 2018-03-08 | 2019-09-12 | Deutsche Post Ag | Method and device for inspecting consignments |
| 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 |
| CN108919376A (en) * | 2018-08-24 | 2018-11-30 | 欧必翼太赫兹科技(北京)有限公司 | A kind of Terahertz human body safety check imaging device |
| CN109188547B (en) * | 2018-08-24 | 2020-10-30 | 欧必翼太赫兹科技(北京)有限公司 | Total reflection type terahertz human body security inspection imaging device |
| CN109444976A (en) * | 2018-12-29 | 2019-03-08 | 同方威视技术股份有限公司 | Millimeter wave/THz wave imaging device |
| 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 |
| CN109444977B (en) * | 2018-12-29 | 2024-04-05 | 清华大学 | Millimeter wave/terahertz wave imaging device and method for detecting human body or article |
| CN109521492A (en) * | 2018-12-29 | 2019-03-26 | 同方威视技术股份有限公司 | Millimeter wave/THz wave safety check instrument and its reflecting plate scanning driving device |
| CN109870739B (en) * | 2018-12-29 | 2024-03-29 | 清华大学 | Millimeter wave/terahertz wave imaging apparatus |
| CN109444975B (en) * | 2018-12-29 | 2024-06-11 | 清华大学 | Millimeter wave/terahertz wave imaging apparatus |
| RU206438U1 (en) * | 2021-03-30 | 2021-09-13 | Частное Учреждение По Обеспечению Научного Развития Атомной Отрасли "Наука И Инновации" | Terahertz imaging device |
| CN114324345B (en) * | 2021-11-01 | 2024-01-12 | 清华大学深圳国际研究生院 | Material imaging method and device, terminal equipment and storage medium |
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| US6815683B2 (en) * | 2002-05-31 | 2004-11-09 | New Jersey Institute Of Technology | Terahertz imaging system and method |
| GB0321628D0 (en) * | 2003-09-15 | 2003-10-15 | Council Cent Lab Res Councils | Millimetre and sub-millimetre imaging device |
| JP2005265793A (en) * | 2004-03-22 | 2005-09-29 | Pentax Corp | Apparatus for tracking specified substance |
| US20050273999A1 (en) * | 2004-06-09 | 2005-12-15 | General Electric Company | Method and system for fabricating components |
| GB0417394D0 (en) * | 2004-08-04 | 2004-09-08 | Council Cent Lab Res Councils | Scanning imaging device |
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| CN101832912B (en) * | 2010-04-16 | 2011-11-09 | 首都师范大学 | Terahertz wave fast imaging scanner |
| CN102004311B (en) * | 2010-09-29 | 2012-05-23 | 首都师范大学 | Tera-hertz wave scanning method and system |
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