CN108107016A - A kind of quasi-optical reflection imaging system of low-loss high-isolation Terahertz - Google Patents
A kind of quasi-optical reflection imaging system of low-loss high-isolation Terahertz Download PDFInfo
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- CN108107016A CN108107016A CN201611044820.6A CN201611044820A CN108107016A CN 108107016 A CN108107016 A CN 108107016A CN 201611044820 A CN201611044820 A CN 201611044820A CN 108107016 A CN108107016 A CN 108107016A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 28
- 238000002955 isolation Methods 0.000 title claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 28
- 238000007405 data analysis Methods 0.000 claims abstract description 15
- 230000010287 polarization Effects 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000013480 data collection Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 230000005672 electromagnetic field Effects 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 claims 1
- 238000003780 insertion Methods 0.000 abstract description 2
- 230000037431 insertion Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005616 pyroelectricity Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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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
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/34—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using capacitors, e.g. pyroelectric capacitors
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of quasi-optical reflection imaging system of low-loss high-isolation Terahertz, including：THz source（1）, conical corrugated speaker（2）, chopper（3）, Fresnel lens A（4）, metal gate（5）、45oFaraday rotator（6）, Fresnel lens B（7）, automatically controlled scanning bracket（9）, pyroelectric detector（10）, control computer（13）, further include：Intermediate-freuqncy signal reads module（11）With data analysis module（12）.Metal gate and 45 in the present inventionoFaraday rotator realizes transmitting signal isolates with reception signal, and 45oFaraday rotator has many advantages, such as that Insertion Loss is smaller using quasi-optical structure, and bandwidth is larger, is a relatively good scheme in terahertz wave band, solves the problems, such as the loss isolation difference brought using spectroscope.The results showed in terahertz imaging system of the present invention, the effect of target catoptric imaging is improved.
Description
Technical field
It is quasi-optical anti-the present invention relates to a kind of Terahertz reflection imaging system, particularly a kind of low-loss high-isolation Terahertz
Penetrate imaging system.
Background technology
Since terahertz wave band has the characteristics such as high-resolution, Fingerprint, penetrability so that THz imaging technology is near
Year is increasingly taken seriously.Terahertz catoptric imaging is compared with transmission imaging in detection noncooperative target or with special compared with strong reflection
Property target when tool have great advantage, existing Terahertz reflection imaging system generally comprises：THz source, conical horn,
Chopper, spectroscope, imaging len, pyroelectric detector, scanning bracket, computer, data acquisition module, data analysis module.
Imageable target is fixed in scanning bracket, by computer scanning bracket is controlled to be scanned, is obtained by pyroelectric detector
The Terahertz echo information reflected at imageable target different position send the two-dimentional reflected image of acquisition target after back-end processing.Into
Be transmitting to be realized as the characteristics of one isolates with receiving light path, and the spectroscope used at present is generally using High Resistivity Si semi-transparent half
Anti- spectroscope, spectroscope and light path are into 45oIt places at angle：To receiving light path, the terahertz signal one of imageable target reflection is semi-permeable
Spectroscope is received by pyroelectric detector, and in addition half energy reflects back into transmitting light path and can not be received；To emitting light path,
THz wave by it is spectroscopical when have half energy transmission cross spectroscope and can not whole energy exposures to target.This
A bit so that existing Terahertz reflection imaging system, which exists, is lost the problem of big isolation is poor, the quality of imaging is affected.
The content of the invention
Present invention aims at a kind of quasi-optical reflection imaging system of low-loss high-isolation Terahertz is provided, Terahertz is solved
Reflection imaging system, which exists, is lost the problem of big isolation is poor.
A kind of quasi-optical reflection imaging system of low-loss high-isolation Terahertz, including：THz source, conical corrugated speaker,
Chopper, Fresnel lens A, metal gate, 45oFaraday rotator, Fresnel lens B, automatically controlled scanning bracket, pyroelectricity detection
Device, control computer, further include：Intermediate-freuqncy signal reads module and data analysis module.
Intermediate-freuqncy signal read module function be：Gather the output signal of pyroelectric detector；
The function of data analysis module is：Complete parsing and imaging that intermediate-freuqncy signal reads module output signal；
In transmitting light path, THz source, conical corrugated speaker, chopper, Fresnel lens A, metal gate, 45 are sequentially placedo
Faraday rotator, Fresnel lens B, automatically controlled scanning bracket；THz source output port is inputted with conical corrugated speaker feed
Mouth is connected by waveguide.Receiving light path is vertical with transmitting light path, and it is same that pyroelectric detector with Fresnel lens B is located at spectroscope
Side, for receiving the detection light of wire grating reflection.The delivery outlet of pyroelectric detector reads the input of module with intermediate-freuqncy signal
Mouth connection, the delivery outlet that intermediate-freuqncy signal reads module are connected with control computer, and data analysis module is built in control computer
In.
The continuous wave signal in the range of THz source output 325GHz ~ 500GHz is tuned, signal is after conical horn with vertical
Straight polarization Gaussian beam is radiate, and after chopper is modulated, Gaussian beam is converged by Fresnel lens A and incides into metal
Grid, during due to E field polarization direction perpendicular to metal gate, incidence wave low-loss is transmitted through metal gate, while 45oFaraday is revolved
Turning device can make the polarization direction of signal electromagnet field rotate 45o, Fresnel lens B will rotate 45 againoGaussian beam afterwards converges to
Equipped with being used by the automatically controlled scanning bracket of imageable target on platform, imageable target different position is made successively by automatically controlled scanning bracket
By the central axis of Fresnel lens B, imageable target reflection at this time is most strong, and echo-signal is converged again by Fresnel lens B
It is poly-, and pass through 45oFaraday rotator causes signal electromagnet field polarization direction to rotate 45 againo, so that inciding into metal gate
Parallel to metal gate, echo-signal at this time is reflected in the light path where pyroelectric detector echo-signal polarization direction.
In imaging process, the Gauss that imageable target is placed on after Fresnel Lenses B conversion girdles the waist place, and waist radius is smaller, distinguishable essence
Degree is higher.When automatically controlled scanning bracket is scanned sampling, imageable target different position passes sequentially through beam waist position, due to object
Internal and surface texture difference, the signal strength that pyroelectric detector receives is also just different, and control computer control is automatically controlled
Scanning bracket reads module synchronization work with intermediate-freuqncy signal, and real-time data collection is handled finally by data analysis module, finally
The two-dimentional reflected image of obtained imageable target.
Metal gate plays the role of Polarization selection and signal isolation in the present invention：When E field polarization direction is parallel to metal gate
When, incidence wave almost reflects；When E field polarization direction is perpendicular to metal gate, incidence wave almost exclusively through.While 45o
Faraday rotator can make by signal electromagnet field polarization direction rotation 45o, so allow for launching site polarization direction and
The polarization direction of received field is mutually perpendicular to, it is achieved thereby that transmitting signal is with receiving isolating for signal；Test the quasi-optical knot used
Structure 45oFaraday rotator has many advantages, such as that Insertion Loss is smaller, and bandwidth is larger, solves the loss isolation brought using spectroscope
Problem.Tests prove that in Terahertz reflection imaging system of the present invention, the sensitivity of imaging is improved, so as to obtain
Obtain substantially improving for target reflected image.
Description of the drawings
A kind of quasi-optical reflection imaging system structure schematic diagram of low-loss high-isolation Terahertzs of Fig. 1.
1. 4. Fresnel lens A of THz source 2. conical corrugated speaker, 3. chopper, 5. metal gates
6.45o7. Fresnel lens B of Faraday rotator, 8. imageable targets, 9. automatically controlled scanning bracket
10. 11. intermediate-freuqncy signal of pyroelectric detector reads 12. data analysis module of module, 13. control computer.
Specific embodiment
A kind of quasi-optical reflection imaging system of low-loss high-isolation Terahertz, including：THz source 1, conical corrugated speaker
2nd, chopper 3, Fresnel lens A 4, metal gate 5,45oFaraday rotator 6, Fresnel lens B7, imageable target 8, electricity
It controls scanning bracket 9, pyroelectric detector 10, intermediate-freuqncy signal and reads module 11, data analysis module 12, control computer 13.
Intermediate-freuqncy signal read module 11 function be：Gather the output signal of pyroelectric detector 10；
The function of data analysis module 12 is：It completes intermediate-freuqncy signal and reads parsing and imaging that module 11 exports signal；
In transmitting light path, THz source 1, conical corrugated speaker 2, chopper 3, Fresnel lens A4, metal gate are sequentially placed
5、45oFaraday rotator 6, Fresnel lens B7, automatically controlled scanning bracket 9；1 output port of THz source and conical corrugated speaker
2 feed input ports are connected by waveguide.Receiving light path is vertical with transmitting light path, pyroelectric detector 10 and Fresnel lens B7
In homonymy, for receiving the detection light of the reflection of metal gate 5.The delivery outlet of pyroelectric detector 10 reads module 11 with intermediate-freuqncy signal
Input port connection, intermediate-freuqncy signal read module 11 delivery outlet be connected with control computer 13, built in data analysis module 12
In control computer 13.
The continuous wave signal in the range of the output of THz source 1 325GHz ~ 500GHz is tuned, signal is through conical corrugated speaker 2
It is radiate afterwards with vertical polarization Gaussian beam, after the modulation of chopper 3, Gaussian beam is by Fresnel lens A4 convergences and incidence
To metal gate 5, during due to E field polarization direction perpendicular to metal gate 5, incidence wave low-loss is transmitted through metal gate 5, while 45o
Faraday rotator 6 can be so that signal electromagnet field polarization direction rotation 45o, Fresnel lens B7 will rotate 45 againoGauss afterwards
Wave beam is converged on the sampling platform of the automatically controlled scanning bracket 9 equipped with imageable target 8, is made by the scanning of automatically controlled scanning bracket 9
As 8 different position of target passes sequentially through the central axis of Fresnel lens B7, imageable target 8 reflects most strong, echo-signal at this time
It is converged again by Fresnel lens B7, and passes through 45oFaraday rotator 6 is so that signal electromagnet field polarization direction rotates again
45o, so that inciding into the echo-signal polarization direction of metal gate 5 parallel to metal gate 5, echo-signal at this time is reflected
Onto the light path where pyroelectric detector 10.In imaging process, imageable target 8 is placed on the Gauss after Fresnel Lenses B7 conversion
Place with a tight waist, waist radius is smaller, and distinguishable precision is higher.When automatically controlled scanning bracket 9 is scanned sampling, imageable target 8
Different position passes sequentially through beam waist position, due to the difference of interior of articles and surface texture, what pyroelectric detector 10 received
Signal strength is also just different, and control computer 13 controls automatically controlled scanning bracket 9 to read module 12 with intermediate-freuqncy signal and works asynchronously, real
When gathered data, handled finally by data analysis module 12, the two-dimentional reflected image of the imageable target 8 finally obtained.
Claims (7)
1. a kind of quasi-optical reflection imaging system of low-loss high-isolation Terahertz, including：THz source（1）, conical corrugated speaker
（2）, chopper（3）, Fresnel lens A（4）, metal gate（5）、45oFaraday rotator（6）, Fresnel lens B（7）, it is automatically controlled
Scanning bracket（9）, pyroelectric detector（10）, control computer（13）, further include：Intermediate-freuqncy signal reads module（11）With data
Analysis module（12）.
2. intermediate-freuqncy signal reads module（11）Function be：Gather pyroelectric detector（10）Output signal；
Data analysis module（12）Function be：It completes intermediate-freuqncy signal and reads module（11）It exports at the parsing and imaging of signal
Reason；
In transmitting light path, THz source is sequentially placed（1）, conical corrugated speaker（2）, chopper（3）, Fresnel lens A
（4）, metal gate（5）、45oFaraday rotator（6）, Fresnel lens B（7）, automatically controlled scanning bracket（9）；THz source（1）It is defeated
Exit port and conical corrugated speaker（2）Feed input port is connected by waveguide.
3. receiving light path is vertical with transmitting light path, pyroelectric detector（10）With Fresnel lens B（7）Positioned at spectroscope homonymy,
For receiving the detection light of wire grating reflection.
4. pyroelectric detector（10）Delivery outlet and intermediate-freuqncy signal read module（11）Input port connection, intermediate-freuqncy signal read
Module（11）Delivery outlet and control computer（13）Connection, data analysis module（12）It is built in control computer（13）In.
5. tune THz source（1）The continuous wave signal in the range of 325GHz ~ 500GHz is exported, signal is after conical horn with vertical
Straight polarization Gaussian beam is radiate, by chopper（3）After modulation, Gaussian beam is by Fresnel lens A（4）It converges and incides into
Metal gate（5）, since E field polarization direction is perpendicular to metal gate（5）When, incidence wave low-loss is transmitted through metal gate（5）, together
When 45oFaraday rotator（6）The polarization direction of signal electromagnet field can be made to rotate 45o, Fresnel lens B（7）It again will rotation
45oGaussian beam afterwards is converged to equipped with by imageable target（8）Automatically controlled scanning bracket（9）Using on platform, swept by automatically controlled
Retouch stent（9）Make imageable target（8）Different position passes sequentially through Fresnel lens B（7）Central axis, imageable target at this time
（8）Reflection is most strong, and echo-signal passes through Fresnel lens B（7）It converges again, and passes through 45oFaraday rotator（6）So that letter
Number polarization of electromagnetic field direction rotates 45 againo, so that inciding into metal gate（5）Echo-signal polarization direction parallel to metal
Grid（5）, echo-signal at this time is reflected to pyroelectric detector（10）In the light path at place.
6. in imaging process, imageable target（8）It is placed on the Gauss after Fresnel Lenses B conversion to girdle the waist place, waist radius is smaller, can
The precision of resolution is higher.
7. when automatically controlled scanning bracket（9）When being scanned sampling, imageable target（8）Different position passes sequentially through beam waist position, by
In the difference of interior of articles and surface texture, pyroelectric detector（10）The signal strength received is also just different, and control calculates
Machine（13）Control automatically controlled scanning bracket（9）Module is read with intermediate-freuqncy signal（11）Synchronous working, real-time data collection, finally by
Data analysis module（12）Processing, the imageable target finally obtained（8）Two-dimentional reflected image.
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| CN201611044820.6A CN108107016A (en) | 2016-11-24 | 2016-11-24 | A kind of quasi-optical reflection imaging system of low-loss high-isolation Terahertz |
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| CN201611044820.6A CN108107016A (en) | 2016-11-24 | 2016-11-24 | A kind of quasi-optical reflection imaging system of low-loss high-isolation Terahertz |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108646304A (en) * | 2018-07-02 | 2018-10-12 | 常州感通威视微波科技有限公司 | active imaging system |
| 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 |
| CN110057776A (en) * | 2019-05-10 | 2019-07-26 | 南开大学 | A kind of integrated form Terahertz confocal imaging device and imaging method based on waveguiding structure |
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| CN106597662A (en) * | 2016-12-05 | 2017-04-26 | 上海无线电设备研究所 | Terahertz transmitting-receiving common dual-polarized quasi optical circulator |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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