CN101738380A - single-pixel terahertz camera - Google Patents
single-pixel terahertz camera Download PDFInfo
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- CN101738380A CN101738380A CN 200910219487 CN200910219487A CN101738380A CN 101738380 A CN101738380 A CN 101738380A CN 200910219487 CN200910219487 CN 200910219487 CN 200910219487 A CN200910219487 A CN 200910219487A CN 101738380 A CN101738380 A CN 101738380A
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Abstract
The invention relates to a single-pixel terahertz camera, which is characterized in that a linear optical path is formed between a terahertz transmitter and a terahertz receiver, and the optical path is sequentially provided with a beam expander, a sampling table, a random template and a convergent mirror from the beginning of the terahertz transmitter; the output end of the terahertz receiver is connected with an A/D converter, and the output port of the A/D converter 7 is connected with a computer host. The single-pixel terahertz camera can solve the common problem of the THz imaging technology in the prior art, avoids the shortcoming of low signal-to-noise ratio of a THz array probe, and fully exerts the advantage of high signal-to-noise ratio of a single-point THz probe. The THz imaging can be completed through exchanging the random template, and unavailable information of the acquired THz image information is compressed, thereby an image information processing task of a computer is lightened, and the imaging speed is effectively improved. Because a flexible PCB printed board is adopted for the random template, the device cost can be greatly reduced along with the increase of the number of the products.
Description
Technical field
The present invention relates to a kind of single-pixel terahertz camera, belong to the terahertz imaging technical field.
Background technology
Existing terahertz imaging technology has: (1) uses the T ray conventional imaging technique of photoconductive dipole; (2) the electric light T radial imaging technology of use ccd video camera; (3) use monocycle impulse T ray to carry out the imaging technique of object reconstruction by time reversal; (4) the T ray catoptric imaging technology of utilizing kirchhoff to move; (5) dynamic aperture and details in a play not acted out on stage, but told through dialogues T radial imaging technology; (6) T ray computer chromatography imaging technique; (7) T x ray diffraction chromatography imaging technique; (8) T ray microscope imaging technique utilizes means such as near field technique, and resolution can reach micron; (9) the T radial imaging technology of 50m-200m.
The relevant patent of having applied for has:
(1) a kind of continuous wave HZ real time imaging apparatus, open (bulletin) number: CN201141981
(2) a kind of continuous wave HZ real time imaging apparatus and method thereof, open (bulletin) number: CN101251492
(3) a kind of terahertz wave detector, detection system and detection method, open (bulletin) number: CN101377462
Existing THz formation method, conclude and get up to have three deficiencies:
(1) average power of the present pulse THz ripple that produces has only nanowatt to the microwatt order of magnitude, survey for single-point to reach 105 or higher signal to noise ratio (S/N ratio), but the signal to noise ratio (S/N ratio) of real-time two-dimensional imaging is but very low.Imaging will obtain higher signal to noise ratio (S/N ratio), needs the higher radiation source of power.
(2) the THz two-dimensional imaging method mainly is to adopt scanning (light source scanning or target object motion scan) or detector array imaging at present.
(3) equipment price of a whole set of THz time-domain spectroscopy system and imaging system is too expensive, is unfavorable for promoting.Continuous T Hz imaging system approximately needs ten thousand dollars of 5-15 now, and pulse THz imaging system needs ten thousand dollars of 20-100.
Summary of the invention
The technical matters that solves
For fear of the deficiencies in the prior art part, the present invention proposes a kind of single-pixel terahertz camera,
Thought of the present invention is: Compressive Sensing (the being called for short CS) theory based on rising in recent years, adopt the single-point terahertz detector to realize the new technology of two-dimentional terahertz imaging.The CS theory projects to lower dimensional space by the stochastic sampling template with the higher-dimension signal compression based on the sparse characteristic of signal, more a series of low dimensional signals is recovered original signal.Single-point THz detector image-forming system surveys the compound optical-mechanical system that imaging system is formed jointly by THz optical projection system and THz.
Technical scheme
A kind of single-pixel terahertz camera is characterized in that comprising terahertz transmitter 1, beam expanding lens 2, sample stage 3, random mask 4, convergent mirror 5, Terahertz receiver 6, A/D converter 7, main frame 9, display screen 8 and automatic die changing mechanism 10; Between terahertz transmitter 1 and Terahertz receiver 6, constitute linear light road always, be provided with beam expanding lens 2, sample stage 3, random mask 4 and convergent mirror 5 successively from terahertz transmitter 1 beginning in the light path; The output terminal of Terahertz receiver 6 connects A/D converter 7, and the output port of A/D converter 7 connects main frame 9.
Random mask 4 connects automatic die changing mechanism 10, and die changing mechanism 10 connects the signal output port of main frame 9 automatically.
Described automatic die changing mechanism 10 comprises that control gear 11, motor 12, gear train 13, main drive shaft 16, random mask dial plug device 15 and driven shaft 18; The input end of control gear 11 connects with computing machine, the output terminal of control gear 11 connects motor 12, motor 12 is by gear train 13 control main drive shafts 16, on the main drive shaft 16 fixedly random mask dial plug device 15, and dial plug device 15 by random mask and be connected with random mask 4; The random mask 4 formation ring-type that joins end to end is wrapped on main drive shaft 16, the driven shaft 18.
On main drive shaft 16, be provided with the main drive shaft pressing plate wheel 14 of extruding random mask 4, on driven shaft 18, be provided with the driven shaft pressing plate wheel 17 of extruding random mask 4.
A kind of method of utilizing above-mentioned single-pixel terahertz camera to obtain image is characterized in that step is as follows:
Step 1: behind the electromagnetic impulse process beam expanding lens and testee that terahertz transmitter is sent, produce the N pixel sampling sample of an external light field from scene;
Step 2: adopt random mask Φ
mThe pixel sampling sample is carried out modulating-coding, produce a stochastic transformation electromagnetic pulse signal that obtains from original entire image; Described random mask Φ
mFor producing the matrix of this pixel sampling sample random mask correspondence, utilize the rand () function among the mathematical tool matlab 7.0, generate the matrix of a m * m, to replace with 1 more than or equal to 0.5 element then, element less than 0.5 replaces with 0, can obtain the above-mentioned stochastic matrix that only contains 0 and 1 element (be used for representing printing opacity and lighttight unit).
Step 3: the Terahertz receiver is converted into voltage signal y (m)=Φ with the electromagnetic pulse signal of stochastic transformation
m(n) x (n), wherein: the N pixel sampling sample of x (n) expression external light field from scene, Φ
m(n) for the matrix that only contains 0,1 element of random mask correspondence.
Step 4: the digital voltage signal that obtains corresponding this random mask after the voltage signal conversion with step 3;
Step 5: repeating step 1～4 behind the replacing random mask, change random mask altogether more than 450 times, obtain the measurement vector y that forms by the y more than 450 times (m);
Step 6: according to the space structure of original image and the mapping relations one to one of measurement space formation, construct same Φ, get x=Φ according to y=Φ x
-1Y by the anti-x that releases of y, recovers original original image, and shows on display screen.
Beneficial effect
A kind of single-pixel terahertz camera that the present invention proposes can solve the common issue with that exists in the prior art THz imaging technique: the one, can avoid the very low deficiency of THz detector array signal to noise ratio (S/N ratio), and give full play to the advantage of single-point THz detector high s/n ratio; The 2nd, utilize the ripe application technology of the present single-point THz detector of China, can finish the THz imaging by changing random mask, and garbage that the THz image information of obtaining is compressed has alleviated the Image Information Processing task of computing machine, has improved the speed of imaging effectively.Random mask adopts the flexible PCB printed board, does not have the embargo and the great number price problem of external device; The 3rd, single-point THz detector device is domestic can autonomous production, and along with the quantity of product promotes, device cost can reduce significantly.
Description of drawings
Fig. 1: single-pixel terahertz camera fundamental diagram
The fundamental diagram of the automatic die changing mechanism of the label 10 of Fig. 2: Fig. 1
Embodiment
Now in conjunction with the embodiments, accompanying drawing is further described the present invention:
The embodiment of the invention by single-point terahertz transmitter 1, diameter be the random mask 4 of beam expanding lens 2, sample stage 3, the 256mm * 256mm of 362mm * 362mm, convergent mirror 5 that diameter is 362mm * 362mm, single-point Terahertz receiver 6, A/D converter 7, display screen 8, main frame 9, die changing mechanism 10 etc. is formed automatically.Beam expanding lens 2 is arranged on the light path of terahertz transmitter 1, and sample stage 3 is set after the beam expanding lens.Pass through random mask 4 behind the sample on the light process sample stage 3, and after convergent mirror 5 is assembled, arrive Terahertz receiver 6.The output port of Terahertz receiver 6 inserts A/D converter 7, and the output port of A/D converter 7 connects the signal input port of main frame 9.The image signal output end mouth of main frame 9 connects display screen 8, and the control signal output ends mouth of main frame 9 connects automatic die changing mechanism 10, and die changing mechanism 10 connects random mask 4 automatically.Automatically die changing mechanism 10 moves according to the steering order of main frame 9, thereby drives the replacing of random mask.
The structure of automatic die changing mechanism is in the present embodiment:
The strip-shaped flexible PCB terahertz imaging random mask 4 formation ring-type that joins end to end is wrapped on main drive shaft 16, the driven shaft 18, and is 1cm by diameter, and length is the double template that the squeezing action of the pressing plate wheel 14,17 of 30cm is formed with certain intervals.
Rotate the intermittence of main drive shaft 16, dials plug device 15 by random mask and drive intermittently rotation of strip-shaped flexible PCB terahertz imaging random mask 4, thereby form a new imaging template.Main drive shaft 16 intermittently rotates (450 for finishing the needed independent random mask quantity of complete imaging one time) 450 times, can form 450 random masks, thereby finish once complete terahertz imaging.
The method of utilizing the single-pixel terahertz camera of present embodiment to obtain image is:
(1) according to the space structure of original image and the mapping relations one to one of measurement space formation, (Φ is the stochastic matrix that only contains 0,1 element of random mask correspondence to the Φ of correspondence when constructing the 1st random mask imaging." 0 " element of stochastic matrix the random mask correspondence position grid in " printing opacity " expression, " 1 " element of stochastic matrix the random mask correspondence position grid in " light tight " expression), get x=Φ by y=Φ x
-1Y is by y
1The anti-x that releases
1
(2) repeat (one) 450 time, according to y
mReconstruct x
m(2≤m≤450,450 are for finishing the necessary minimum sampling number of complete imaging one time).
(3) according to x
m(1≤m≤450) structure x recovers original image.
Claims (5)
1. a single-pixel terahertz camera is characterized in that comprising terahertz transmitter (1), beam expanding lens (2), sample stage (3), random mask (4), convergent mirror (5), Terahertz receiver (6), A/D converter (7), computing machine (8) and automatic die changing mechanism (9); Between terahertz transmitter (1) and Terahertz receiver (6), constitute linear light road always, be provided with beam expanding lens (2), sample stage (3), random mask (4) and convergent mirror (5) successively from terahertz transmitter (1) beginning in the light path; The output terminal of Terahertz receiver (6) connects A/D converter (7), and the output port of A/D converter (7) connects computing machine (8).
2. single-pixel terahertz camera according to claim 1 is characterized in that: random mask (4) connects automatic die changing mechanism (9), and die changing mechanism (9) connects the signal output port of computing machine (8) automatically.
3. single-pixel terahertz camera according to claim 2 is characterized in that: described automatic die changing mechanism (9) comprises that control gear (10), motor (11), gear train (12), main drive shaft (15), random mask dial plug device (14) and driven shaft (16); The input end of control gear (10) connects with computing machine, the output terminal of control gear (10) connects motor (11), motor (11) is by gear train (12) control main drive shaft (15), main drive shaft (15) is gone up fixedly random mask and is dialled plug device (14), and dials plug device (14) by random mask and be connected with random mask (6); Random mask (4) the formation ring-type that joins end to end is wrapped on main drive shaft (15), the driven shaft (16).
4. single-pixel terahertz camera according to claim 3, it is characterized in that: on main drive shaft (15), be provided with the main drive shaft pressing plate wheel (13) of extruding random mask (4), on driven shaft (16), be provided with the driven shaft pressing plate wheel (17) of extruding random mask (4).
5. method of utilizing described any single-pixel terahertz camera of claim 1～4 to obtain image is characterized in that step is as follows:
Step 1: behind the electromagnetic impulse process beam expanding lens and testee that terahertz transmitter is sent, produce the N pixel sampling sample of an external light field from scene;
Step 2: adopt random mask Φ
mThe pixel sampling sample is carried out modulating-coding, produce a stochastic transformation electromagnetic pulse signal that obtains from original entire image; Described random mask Φ
mFor producing the matrix of this pixel sampling sample random mask correspondence, utilize the rand () function among the mathematical tool matlab 7.0, generate the matrix of a m * m, will replace with 1 more than or equal to 0.5 element then, element less than 0.5 replaces with 0, is only contained the stochastic matrix of 0 and 1 element;
Step 3: the Terahertz receiver is converted into voltage signal y (m)=x (n) Φ with the electromagnetic pulse signal of stochastic transformation
m(n), wherein: the N pixel sampling sample of x (n) expression external light field from scene, Φ
m(n) for the matrix that only contains 0,1 element of random mask correspondence;
Step 4: the digital voltage signal that obtains corresponding this random mask after the voltage signal conversion with step 3;
Step 5: repeating step 1～3 behind the replacing random mask, change random mask more than 450 times, repeating step 1～4 more than 450 times, obtains the measurement vector y that is formed by the y more than 450 times (m);
Step 6: according to the space structure of original image and the mapping relations one to one of measurement space formation, construct same Φ, get x=Φ according to y=Φ x
-1Y by the anti-x that releases of y, recovers original original image, and shows on display screen.
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| CN 200910219487 CN101738380A (en) | 2009-12-14 | 2009-12-14 | single-pixel terahertz camera |
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| CN 200910219487 CN101738380A (en) | 2009-12-14 | 2009-12-14 | single-pixel terahertz camera |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684041A (en) * | 2011-03-18 | 2012-09-19 | 精工爱普生株式会社 | Terahertz wave generation device, light source device, camera, imaging device, and measurement device |
| CN105241815A (en) * | 2015-10-16 | 2016-01-13 | 深圳市华讯方舟科技有限公司 | Terahertz imaging device and method |
| CN105241816A (en) * | 2015-10-16 | 2016-01-13 | 深圳市华讯方舟微电子科技有限公司 | Terahertz imaging device and method |
| CN105806802A (en) * | 2016-05-25 | 2016-07-27 | 苏州禄丰检测科技有限公司 | Terahertz method structure scenograph |
| CN106595856A (en) * | 2017-02-13 | 2017-04-26 | 天津大学 | Terahertz wave compression perception rapid imaging apparatus based on rotation disc-like mask plate |
| CN109803096A (en) * | 2019-01-11 | 2019-05-24 | 北京大学 | A kind of display methods and system based on pulse signal |
| CN111982884A (en) * | 2020-09-15 | 2020-11-24 | 江苏师范大学 | Compact 266nm shortwave ultraviolet Raman spectrometer |
| US11228758B2 (en) | 2016-01-22 | 2022-01-18 | Peking University | Imaging method and device |
-
2009
- 2009-12-14 CN CN 200910219487 patent/CN101738380A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9341567B2 (en) | 2011-03-18 | 2016-05-17 | Seiko Epson Corporation | Terahertz wave generation device, light source device, camera, imaging device, and measurement device |
| CN102684041B (en) * | 2011-03-18 | 2017-04-12 | 精工爱普生株式会社 | Terahertz wave generation device, light source device, camera, imaging device, and measurement device |
| CN102684041A (en) * | 2011-03-18 | 2012-09-19 | 精工爱普生株式会社 | Terahertz wave generation device, light source device, camera, imaging device, and measurement device |
| CN105241815A (en) * | 2015-10-16 | 2016-01-13 | 深圳市华讯方舟科技有限公司 | Terahertz imaging device and method |
| CN105241816A (en) * | 2015-10-16 | 2016-01-13 | 深圳市华讯方舟微电子科技有限公司 | Terahertz imaging device and method |
| CN105241816B (en) * | 2015-10-16 | 2018-11-23 | 华讯方舟科技有限公司 | A kind of terahertz imaging device and method |
| CN105241815B (en) * | 2015-10-16 | 2018-11-23 | 华讯方舟科技有限公司 | A kind of terahertz imaging device and method |
| US11228758B2 (en) | 2016-01-22 | 2022-01-18 | Peking University | Imaging method and device |
| US11800098B2 (en) | 2016-01-22 | 2023-10-24 | Spike Vision (Beijing) Technology Co., Ltd. | Imaging method and device |
| CN105806802A (en) * | 2016-05-25 | 2016-07-27 | 苏州禄丰检测科技有限公司 | Terahertz method structure scenograph |
| CN106595856A (en) * | 2017-02-13 | 2017-04-26 | 天津大学 | Terahertz wave compression perception rapid imaging apparatus based on rotation disc-like mask plate |
| US10937132B2 (en) | 2019-01-11 | 2021-03-02 | Peking University | Spike signal-based display method and system |
| CN109803096B (en) * | 2019-01-11 | 2020-08-25 | 北京大学 | Display method and system based on pulse signals |
| CN109803096A (en) * | 2019-01-11 | 2019-05-24 | 北京大学 | A kind of display methods and system based on pulse signal |
| CN111982884A (en) * | 2020-09-15 | 2020-11-24 | 江苏师范大学 | Compact 266nm shortwave ultraviolet Raman spectrometer |
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Open date: 20100616 |