CN105866773A - High-power terahertz continuous wave two-dimensional imaging system - Google Patents
High-power terahertz continuous wave two-dimensional imaging system Download PDFInfo
- Publication number
- CN105866773A CN105866773A CN201610322075.0A CN201610322075A CN105866773A CN 105866773 A CN105866773 A CN 105866773A CN 201610322075 A CN201610322075 A CN 201610322075A CN 105866773 A CN105866773 A CN 105866773A
- Authority
- CN
- China
- Prior art keywords
- signal
- continuous wave
- module
- power
- thz continuous
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Radar, Positioning & Navigation (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a high-power terahertz continuous wave two-dimensional imaging system which comprises a duplexer, a two-dimensional scanning platform, a terahertz continuous wave emitting module, a terahertz continuous wave receiving module, a TPX lens, a data collecting and processing module, an image processing module and an image display unit. The high-power terahertz continuous wave two-dimensional imaging system has the advantages that frequency exists at the terahertz wave band, the emitting power of the emitting module is high, and the system is simple in structure, small in size and high in resolution ratio.
Description
Technical field
The present invention relates to Terahertz technical field of nondestructive testing, particularly to a kind of high-power active Terahertz
The system and method for continuous wave two dimension high-resolution imaging.
Background technology
The terahertz wave band of general appellation, its frequency range is that (wavelength is from 0.03mm for 0.1THz to 10THz
To 3mm)；Refer in particular to 0.3THz to 3THz in some occasion, be endowed determining of a kind of broad sense the most sometimes
Justice, its frequency range can comprise the ripple of up to 100THz, this include whole in, far infrared band.At electricity
In electromagnetic spectrum, THz wave, between microwave and far infrared wave, is in macroelectronics to microcosmic photon
The transition stage learned.In person in electronics, the electromagnetic wave of this wave band is otherwise known as millimeter wave or sub-milli
Metric wave；In field of spectroscopy, it is also referred to as far ir ray.
Nature has substantial amounts of terahertz emission source, such as the hot spoke of our most objects at one's side
Penetrate all at terahertz wave band.But, owing to lacking the high efficiency emission source of terahertz wave band and sensitive
Detector, the electromagnetic radiation of terahertz wave band does not obtain as microwave in-depth study the same with far infrared wave.
Why THz wave causes the research interest that we are dense, not merely because it is that a class is widely present
But electromagnetic radiation the most well known, more important reason is that it has a lot of unique character.Tool
For body, THz wave mainly has a following feature:
1, THz wave has good penetrance for a lot of dielectric materials and nonpolar liquid.Terahertz
One application prospect the most attractive of radiation is as x-ray imaging and ultrasound imaging techniques
Supplement, for safety inspection or carry out nondestructive inspection in quality control.
2, Terahertz Technology has high security, the photon energy having kiloelectron-volt compared to X-ray,
The order of magnitude of the photon energy of terahertz emission only milli electron volts.The photon energy of THz wave is less than each
Planting the bond energy of chemical bond, therefore it will not cause harmful ionization reaction.
3, terahertz wave band contains abundant spectral information.Substantial amounts of molecule, especially organic molecule,
Owing to it rotates and the transition of vibration (including that collective is shaken), reveal strong absorption at this band table
And dispersion characteristics.
4, THz wave is compared with microwave, and frequency is higher, when as communications carrier, and can in the unit interval
To carry more information.
5, shorter due to the wavelength of THz wave, his transmitting directivity is better than microwave.
6, in imaging applications, THz wave has higher spatial resolution, or is keeping equal empty
Between resolution time there is the longer depth of field.
Only have the most in the world at present Rensselaer Polytech Inst of the U.S. (Rensselaer Polytechnic Institute,
RPI), American National Air and Space Executive Agent (NASA) and the terahertz of department of physics of Capital Normal University of China
Hereby POP and imaging experiment room have and THz continuous wave two-dimensional imaging system are come into operation.They are real
The method that existing THz continuous wave two-dimensional imaging uses is relatively costly, structure is complicated and imaging resolution is limited
Condition processed is more.
Analyze system currently with vector network analyzer and terahertz time-domain spectroscopy and can realize Terahertz
The two-dimensional imaging of ripple, but terahertz time-domain spectroscopy analyze system detection testee transmitter module send out
Penetrating power and only have a few milliwatt, the transmitting power of the transmitter module of vector network analyzer detection testee is also
Only tens milliwatts, this will limit the resolution of THz wave two-dimensional imaging.
Accordingly, it would be desirable to a kind of transmitter module is launched, power is higher, price is relatively low, simple in construction and resolution
Higher THz continuous wave two-dimensional imaging system.
Summary of the invention
It is an object of the invention to provide a kind of knot with high-power THz continuous wave transmitter module as core
Structure is simple, resolution is high, lower-cost THz continuous wave two-dimensional imaging system.
The present invention includes:
Duplexer, launches signal for sending THz continuous wave to the measured surface of measurand
And receive the echo-signal returned from the measured surface of measurand；
Two-dimensional scan platform, for fixing on two dimensional surface and mobile measurand；
THz continuous wave transmitter module, launches for generating the THz continuous wave being sent to measurand
Signal；
THz continuous wave receiver module, connects for receiving and process the Terahertz from duplexer
Continuous ripple echo-signal；
TPX lens, including TPX lens I and TPX lens II, for being launched by THz continuous wave
The THz continuous wave that module is launched first passes through TPX lens I and becomes parallel, then through TPX lens II
Converge to the measured surface of measurand；Or for the Terahertz that the measured surface of measurand is reflected
Continuous wave first passes through TPX lens II and becomes parallel, then converges to described transmitting-receiving altogether through TPX lens I
Use antenna；
Data acquisition and processing (DAP) module, for gathering and process from the output of THz continuous wave receiver module
Echo-signal is to generate the two dimensional image of the measured surface of measurand；
Image processing module, for process further two dimensional image that data acquisition and processing (DAP) module generates with
Image is made to become apparent from；
Image-display units, the two dimensional image generated by image processing module for display.
Transmitting signal from THz continuous wave transmitter module is launched to TPX lens by duplexer
I, THz continuous wave is become parallel；Further, THz wave passes through TPX lens II, will
THz continuous wave converges to the measured surface with fissare measurand.
The described distance between TPX lens I and TPX lens II is less than the focal length of TPX lens.TPX
Lens I are identical with TPX lens II, and TPX lens I are staggered relatively with TPX lens II.
THz continuous wave transmitter module includes the first signal source, the first power amplifier, the one or two frequency multiplication
Device, the second varactor doubler, adjustable attenuator, isolator and directional coupler, THz continuous wave is launched
Module launches signal for generating the THz continuous wave being sent to measurand.
Specifically, the first signal source be operating frequency be the point-frequency signal source of 27.5GHz, can represent
For:
Wherein, A1It is expressed as initial magnitude, f1For frequency 27.5GHz, t is the time,It it is the first signal source
Initial phase value.
Second power amplifier is amplified reaching the peace of the first varactor doubler to the power of the first signal source
Total power input range, after the first varactor doubler, the frequency of signal reaches 55GHz, further across
After second varactor doubler, the frequency of signal reaches 110GHz.First varactor doubler and the second varactor doubler are all
Active device, launches the high-power mainly by the transformation efficiency height decision of the two varactor doubler of signal
(select the first varactor doubler be VDI company model be the high power arrowband doubler of D60, at 55GHz
Conversion efficiency at frequency is more than 30%；Second varactor doubler be VDI company model be the height of D110
Power narrowband doubler, the conversion efficiency at 110GHz frequency is 25%).
Signal after two frequencys multiplication is exported to adjustable attenuator by the second varactor doubler；Adjustable attenuator is by second
The output of varactor doubler realizes reduction in various degree by the knob of regulation adjustable attenuator, and will
The output signal of adjustable attenuator exports to isolator；The straight-through end of directional coupler is returned by isolator
Echo-signal isolation is to prevent echo-signal input to described adjustable attenuator, the outfan of adjustable attenuator
Being connected to the input of isolator, the outfan of isolator is connected to the input of directional coupler；Orientation
The straight-through end of adjustable attenuator is connected to the input of directional coupler by bonder, by directional coupler
Straight-through end is connected to duplexer；Finally send through duplexer.Duplexer
Transmitting signal be represented by:
Wherein, A1' it is the amplitude launching signal.
THz continuous wave receiver module include secondary signal source, the second power amplifier, attenuator,
Three varactor doublers, th harmonic mixer, band filter, low-noise amplifier and cymoscope, Terahertz
Continuous wave receiver module is believed for receiving and process the THz continuous wave echo from duplexer
Number.
Specifically, secondary signal source be operating frequency be the point-frequency signal source of 27.475GHz, can be with table
It is shown as:
Wherein, A2It is expressed as initial magnitude, f2For frequency 27.475GHz, t is the time,For secondary signal source
Initial phase value.
The power in secondary signal source is amplified by the second power amplifier, and attenuator is by second further
The power of the output signal of power amplifier slightly decays to reach the firm power input model of the 3rd varactor doubler
Enclose；The signal that attenuator is exported by the 3rd varactor doubler carries out two frequencys multiplication to 54.95GHz, and by two frequencys multiplication
After signal export to th harmonic mixer local oscillator end；Th harmonic mixer is by the coupled end of directional coupler
Being connected to the radio-frequency head of th harmonic mixer, now the signal frequency of local oscillator end is 109.9GHz, radio-frequency head
Signal frequency be 110GHz.The signal of th harmonic mixer local oscillator end is represented by
Wherein, A2' it is the amplitude of local oscillator end signal.The signal of subharmonic mixed frequency RF end is represented by:
Wherein, A1" it is the amplitude of radio-frequency head signal,It it is the initial phase value of radio-frequency head signal.Secondary humorous
The IF output signal of wave mixing device is represented by:
The medium frequency output end of th harmonic mixer is connected to the input of band filter；The center of band filter
Frequency is 100MHz, is filtered by the clutter beyond 100MHz in the IF output signal of th harmonic mixer
Removing, the output signal of band filter 314 is represented by:
The outfan of band filter is connected to low-noise amplifier；Noise by the output signal of band filter
Reduce and power amplification is to improve the output of 100MHz intermediate-freuqncy signal, the output of low-noise amplifier
Signal is represented by:
Wherein, K is the amplification coefficient of low-noise amplifier,It it is the phase value of signal intensity.Low noise amplification
Device can make the faint intermediate-freuqncy signal through twice down coversion be amplified, and improves the noise of output signal
Ratio, detectivity, then use cymoscope the output signal of low-noise amplifier to be become by AC signal
For direct current signal, and output it signal and be admitted to data acquisition and processing (DAP) module.
First data acquisition and processing (DAP) module gathers echo-signal, then echo-signal carries out data two dimension weight
Row, then carries out mean filter.Image processing module first realizes histogram equalization, then makes contrast stretch
Exhibition, then carries out rim detection and edge sharpening, finally gives two dimensional image.
The first image is generated, histogram equalization metaplasia in image processing module after data acquisition and processing (DAP) module
Become the second image, stretched by contrast further and generate the 3rd image, raw by rim detection further
Become the 4th image, generate the 5th image finally by edge sharpening.
Utilize above-mentioned high-power THz continuous wave two-dimensional imaging system that the imaging process of measurand is included
Following steps:
Two-dimensional scan platform moves measurand；
THz continuous wave transmitter module and duplexer scanning measurand；
THz continuous wave transmitter module generates launches signal；
Transmitting signal is transmitted to measurand by duplexer；
Duplexer receives the echo-signal of measurand surface return and echo-signal is sent to too
Hertz continuous wave receiver module；
Echo-signal is processed and is sent at data acquisition and image by THz continuous wave receiver module
Reason module；
Signal from THz continuous wave receiver module is processed with life by data acquisition and processing (DAP) module
Become the two-dimensional imaging of measurand；
Image processing module, for process further two dimensional image that data acquisition and processing (DAP) module generates with
Image is made to become apparent from；
Image-display units shows the two dimensional image generated by image processing module.
Beneficial effects of the present invention:
(1) cost is relatively low: the present invention utilizes electronic device not use optical element (except TPX lens),
Greatly reduce the cost of system.
(2) simple in construction, easy of integration: power amplifier, doubler and the bonder etc. that the present invention uses
Little and system the circuit structure of device volume is simple, compares the imaging system utilizing the devices such as chopper before
Complexity is low.
(3) THz continuous wave transmitter module power is big: the performance number of THz continuous wave transmitter module exists
About 200mW.
(4) imaging resolution is high: the present invention uses frequency multiplication mode to obtain the frequency of 110GHz, use
Doubler is the active device that conversion efficiency is high, which greatly enhances sending out of THz continuous wave transmitter module
Penetrate power, thus imaging resolution can reach about 2mm.
(5) image taking speed is fast: the present invention uses THz continuous wave imaging, it is not necessary to as terahertz pulse
Imaging equally considers the information of the degree of depth and frequency spectrum, simpler in terms of imaging algorithm, which greatly enhances
Image taking speed.
(6) long transmission distance: the THz continuous wave that the present invention is launched by THz continuous wave transmitter module
The aerial transmission range of signal can reach nearly hundred meters.
(7) signal to noise ratio is high: system uses active terahertz imaging, by controlling the output of each device
Power bracket improves the transmitting power of antenna, and certainly, transmitting power, within safe radiation scope, makes
Obtain echo-signal signal to noise ratio and be significantly larger than the signal to noise ratio of passive type terahertz imaging system reception signal, and then
Obtain higher image quality.
(8) of many uses: to utilize high-power THz continuous wave two-dimensional imaging technique high-resolution and structure
The advantage such as simple, can carry out the detection of all kinds of large-scale instrument outer layer damage, be also applied for the inspection of contraband
Survey.
Accompanying drawing explanation
Fig. 1 is the composition frame chart of the present invention.
Fig. 2 is the structural representation of the present invention.
Fig. 3 is transmitter module and the circuit diagram of receiver module of the present invention.
Fig. 4 is the two-dimensional imaging carried out in data acquisition and processing (DAP) module and the image processing module of the present invention
The flow chart of algorithm.
Fig. 5 be the present invention the contrast of data acquisition and processing (DAP) module and image processing module imaging effect
Figure.
Fig. 6 is the flow chart of the imaging process of the present invention.
Detailed description of the invention
Terahertz imaging system is broadly divided into terahertz pulse imaging and THz continuous wave imaging.Terahertz
The ultimate principle of Pulse Imageing is: contain sample from intensity and the phase place of the terahertz electromagnetic wave of sample reflection
The space distribution information of the complex dielectric permittivity of product.By intensity and the two dimension of phase place of reflected terahertz hereby electromagnetic wave
Information is recorded, and obtains the Terahertz image of sample through suitable process and analysis.Terahertz is even
The ultimate principle of continuous ripple imaging is: wave source provides more higher radiant intensity than pulse source continuously, its essence is
A kind of intensity imaging.When to image objects, according to the defect of interior of articles or the edge of damage to terahertz
Hereby scattering of light effect, thus the intensity distributions of THz wave electromagnetic field can be affected, reflection to object is too
It is shown as the light and shade i.e. difference of intensity on Hertz wave image, the shape of interior of articles, defect can be released accordingly
Or damage position.Therefore, in the case of without the degree of depth and spectrum information, use THz continuous wave to become
As technology, the speed of THz wave imaging can be improved and reduce the complexity of imaging system.
As depicted in figs. 1 and 2, the present invention includes:
Duplexer 11, launches for sending THz continuous wave to the measured surface of measurand 17
Signal also receives the echo-signal returned from the measured surface of measurand 17；
Two-dimensional scan platform 18, for fixing on two dimensional surface and mobile measurand 17；
THz continuous wave transmitter module 10, for generating the THz continuous wave being sent to measurand 17
Launch signal；
THz continuous wave receiver module 12, for receiving and processing the terahertz from duplexer 11
Hereby contiuous-wave echo signal；
TPX lens 16, including TPX lens I 25 and TPX lens II 26, for Terahertz is continuous
The THz continuous wave that ripple transmitter module 10 is launched first passes through TPX lens I 25 and becomes parallel, then warp
Cross TPX lens II 26 and converge to the measured surface of measurand 17；Or for by measurand 17
The THz continuous wave of measured surface reflection first passes through TPX lens II 26 and becomes parallel, then through TPX
Lens I 25 converge to described duplexer 11；
Data acquisition and processing (DAP) module 13, exports from THz continuous wave receiver module for gathering and processing
Echo-signal to generate the two dimensional image of measured surface 23 of measurand 17；
Image processing module 14, for processing the X-Y scheme that data acquisition and processing (DAP) module 13 generates further
As so that image becomes apparent from；
Image-display units 15, the two dimensional image generated by image processing module 14 for display.
As in figure 2 it is shown, duplexer 11 is by the transmitting from THz continuous wave transmitter module 10
Signal is launched to TPX lens I 25, and THz continuous wave is become parallel；Further, Terahertz
Ripple passes through TPX lens II 26, and THz continuous wave converges to the measurand 17 with crack 24
Measured surface 23.
The described distance between TPX lens I 25 and TPX lens II 26 is less than TPX lens 16
Focal length.TPX lens I 25 are identical with TPX lens II 26, TPX lens I 25 and TPX lens II 26
Staggered relatively.
As it is shown on figure 3, THz continuous wave transmitter module 10 includes first signal source the 301, first power
Amplifier the 302, first varactor doubler the 303, second varactor doubler 304, adjustable attenuator 305, isolation
Device 306 and directional coupler 307, it is tested right that THz continuous wave transmitter module 10 is sent to for generation
The THz continuous wave of elephant launches signal.
Specifically, the first signal source 301 be operating frequency be the point-frequency signal source of 27.5GHz, permissible
It is expressed as:
Wherein, A1It is expressed as initial magnitude, f1For frequency 27.5GHz, t is the time,It it is the first signal source 301
Initial phase value.
The power of the first signal source 301 is amplified reaching the one or two times by the second power amplifier 302
Frequently the firm power input range of device 303, after the first varactor doubler 303, the frequency of signal reaches
55GHz, reaches 110GHz further across the frequency of signal after the second varactor doubler 304.One or two times
Frequently device 303 and the second varactor doubler 304 are all active devices, launch the high-power mainly by this of signal
What the transformation efficiency height of two varactor doublers determined (selects the first varactor doubler 303 for VDI company model
For the high power arrowband doubler of D60, the conversion efficiency at 55GHz frequency is more than 30%；Second
Varactor doubler 304 be VDI company model be the high power arrowband doubler of D110, at 110GHz frequency
The conversion efficiency at place is 25%).
Signal after two frequencys multiplication is exported to adjustable attenuator 305 by the second varactor doubler 304；Adjustable attenuator
The output of the second varactor doubler 304 is realized difference by the knob of regulation adjustable attenuator 305 by 305
The reduction of degree, and the output signal of adjustable attenuator 305 is exported to isolator 306；Isolator 306
The echo-signal isolation returned by the straight-through end of directional coupler 307 is to prevent echo-signal input to described
Adjustable attenuator 305, the outfan of adjustable attenuator 305 is connected to the input of isolator 306, isolation
The outfan of device 306 is connected to the input of directional coupler 307；Directional coupler 307 declines adjustable
The straight-through end subtracting device 305 is connected to the input of directional coupler 307, straight by directional coupler 307
Go side is connected to duplexer 11；Finally send through duplexer 11.Transmit-receive sharing sky
The transmitting signal of line 11 is represented by:
The straight-through end of directional coupler 307 is connected to described duplexer；Final through transmit-receive sharing
Antenna sends.The transmitting signal of duplexer is represented by:
Wherein, A1' it is the amplitude launching signal.
Further as it is shown on figure 3, THz continuous wave receiver module 12 include secondary signal source 309,
Second power amplifier 310, attenuator the 311, the 3rd varactor doubler 312, th harmonic mixer 313,
Band filter 314, low-noise amplifier 315 and cymoscope 316, THz continuous wave receiver module 12
For receiving and processing the THz continuous wave echo-signal from duplexer.
Specifically, secondary signal source 309 be operating frequency be the point-frequency signal source of 27.475GHz, can
To be expressed as:
Wherein, A2It is expressed as initial magnitude, f2For frequency 27.475GHz, t is the time,For secondary signal source
The initial phase value of 309.
The power in secondary signal source 309 is amplified by the second power amplifier 310, decays further
The power of the output signal of the second power amplifier 310 is slightly decayed to reach the 3rd varactor doubler by device 311
The firm power input range of 312；The signal that attenuator 311 is exported by the 3rd varactor doubler 312 carries out two
Frequency multiplication is to 54.95GHz, and exports the signal after two frequencys multiplication to th harmonic mixer 313 local oscillator end；Secondary
The coupled end of directional coupler 307 is connected to the radio frequency of th harmonic mixer 313 by harmonic mixer 313
End, now the signal frequency of local oscillator end is 109.9GHz, and the signal frequency of radio-frequency head is 110GHz.Secondary
The signal of harmonic mixer 313 local oscillator end is represented by
Wherein, A2' it is the amplitude of local oscillator end signal.Subharmonic is mixed the signal of 313 radio-frequency heads and is represented by:
Wherein, A1" it is the amplitude of radio-frequency head signal,It it is the initial phase value of radio-frequency head signal.Secondary humorous
The IF output signal of wave mixing device 313 is represented by:
The medium frequency output end of th harmonic mixer 313 is connected to the input of band filter 314；Bandpass filtering
The mid frequency of device 314 is 100MHz, by 100MHz in the IF output signal of th harmonic mixer 313
Clutter in addition filters, and the output signal of band filter 314 is represented by:
The outfan of band filter 314 is connected to low-noise amplifier 315；Output by band filter 314
The noise of signal reduces and power amplification is to improve the output of 100MHz intermediate-freuqncy signal, and low noise is put
The output signal of big device 315 is represented by:
Wherein, K is the amplification coefficient of low-noise amplifier,It it is the phase value of signal intensity.Low noise amplification
Device 315 can make the faint intermediate-freuqncy signal through twice down coversion be amplified, and improves output signal
Signal to noise ratio, detectivity, then use cymoscope 316 by the output signal of low-noise amplifier 315
Become direct current signal from AC signal, and output it signal and be admitted to data acquisition and processing (DAP) module.
As shown in Figure 4, first data acquisition and processing (DAP) module 13 gathers echo-signal 401, then by echo
Signal carries out data two dimension and resets 402, then carries out mean filter 403.Image processing module 14 is the most real
Existing histogram equalization 404, then make contrast stretch 405, then carry out rim detection 406 and edge is sharp
Change 407, finally give two dimensional image 408.
As it is shown in figure 5, generate the first image 501, image procossing mould after data acquisition and processing (DAP) module 13
In block 14, histogram equalization generates the second image 502, is stretched by contrast further and generates the 3rd figure
As 503, generate the 4th image 504 by rim detection further, generate the 5th finally by edge sharpening
Image 505.
As shown in Figure 6, utilize above-mentioned high-power THz continuous wave two-dimensional imaging system to measurand
Imaging process comprises the following steps:
Two-dimensional scan platform 18 moves measurand 17；
THz continuous wave transmitter module 12 and duplexer 11 scan measurand；
THz continuous wave transmitter module 12 generates launches signal；
Transmitting signal is transmitted to measurand 17 by duplexer 11；
Duplexer 11 receives the echo-signal of measurand 17 surface return and echo-signal is sent out
Give THz continuous wave receiver module 12；
THz continuous wave receiver module 12 processes to echo-signal and is sent to data acquisition and image
Processing module 13；
Data acquisition and processing (DAP) module 13 signal from THz continuous wave receiver module is processed with
Generate the two-dimensional imaging of measurand 17；
Image processing module 14, for processing the X-Y scheme that data acquisition and processing (DAP) module 13 generates further
As so that image becomes apparent from；
Image-display units 15 shows the two dimensional image generated by image processing module 14.
Claims (9)
1. a high-power THz continuous wave two-dimensional imaging system, it is characterised in that: include:
Duplexer (11), continuous for sending Terahertz to the measured surface of measurand (17)
Ripple is launched signal and receives the echo-signal returned from the measured surface of measurand (17)；
Two-dimensional scan platform (18), for measurand (17) fixing and mobile on two dimensional surface；
THz continuous wave transmitter module (10), is sent to the Terahertz of measurand (17) for generation
Continuous wave launches signal；
THz continuous wave receiver module (12), for receiving and processing from duplexer (11)
THz continuous wave echo-signal；
TPX lens (16), including TPX lens I (25) and TPX lens II (26), being used for will too
The THz continuous wave that hertz continuous wave transmitter module (10) is launched first passes through TPX lens I (25) and becomes
Become parallel, then converge to the measured surface of measurand (17) through TPX lens II (26)；Or
Person is for first passing through TPX lens II by the THz continuous wave that the measured surface of measurand (17) reflects
(26) become parallel, then converge to described duplexer (11) through TPX lens I (25)；
Data acquisition and processing (DAP) module (13), for gathering and processing defeated from THz continuous wave receiver module
The echo-signal gone out is to generate the two dimensional image of the measured surface (23) of measurand (17)；
Image processing module (14), for processing what data acquisition and processing (DAP) module (13) generated further
Two dimensional image is so that image becomes apparent from；
Image-display units (15), the two dimensional image generated by image processing module (14) for display.
One the most according to claim 1 high-power THz continuous wave two-dimensional imaging system, it is special
Levy and be: described duplexer (11) will be from the transmitting of THz continuous wave transmitter module (10)
Signal is launched to TPX lens I (25), and THz continuous wave is become parallel；THz wave passes through
TPX lens II (26), converge to the measurand (17) with crack (24) by THz continuous wave
Measured surface (23).
One the most according to claim 1 high-power THz continuous wave two-dimensional imaging system, it is special
Levy and be: the distance between described TPX lens I (25) and TPX lens II (26) is less than TPX
The focal length of lens (16)；Described TPX lens I (25) are staggered relatively with TPX lens II (26).
One the most according to claim 1 high-power THz continuous wave two-dimensional imaging system, it is special
Levy and be: described THz continuous wave transmitter module (10) includes the first signal source (301), the first merit
Rate amplifier (302), the first varactor doubler (303), the second varactor doubler (304), adjustable attenuator (305),
Isolator (306) and directional coupler (307), THz continuous wave transmitter module (10) is used for generating
The THz continuous wave being sent to measurand launches signal.
One the most according to claim 4 high-power THz continuous wave two-dimensional imaging system, it is special
Levy and be:
First signal source (301) be operating frequency be the point-frequency signal source of 27.5GHz, can be expressed as:
Wherein, A1It is expressed as initial magnitude, f1For frequency 27.5GHz, t is the time,It is the first signal source (301)
Initial phase value；
The power of the first signal source (301) is amplified reaching first by the second power amplifier (302)
The firm power input range of varactor doubler (303), the frequency of signal after the first varactor doubler (303)
Rate reaches 55GHz, and the frequency further across the second varactor doubler (304) signal afterwards reaches 110GHz；
First varactor doubler (303) and the second varactor doubler (304) are all active devices, launch the big merit of signal
Rate is mainly determined by the transformation efficiency height of the two varactor doubler；
Signal after two frequencys multiplication is exported to adjustable attenuator (305) by the second varactor doubler (304)；Adjustable
Attenuator (305) by the output of the second varactor doubler (304) by regulation adjustable attenuator (305)
Knob realize reduction in various degree, and the output signal of adjustable attenuator (305) is exported to isolation
Device (306)；The echo-signal isolation that the straight-through end of directional coupler (307) is returned by isolator (306)
To prevent echo-signal input to described adjustable attenuator (305), the outfan of adjustable attenuator (305)
Being connected to the input of isolator (306), the outfan of isolator (306) is connected to directional coupler (307)
Input；The straight-through end of adjustable attenuator (305) is connected to directional couple by directional coupler (307)
The input of device (307), is connected to duplexer (11) by the straight-through end of directional coupler (307)；
Finally send through duplexer (11)；The transmitting signal of duplexer (11) can represent
For:
The straight-through end of directional coupler (307) is connected to described duplexer；Finally through transmitting-receiving altogether
Send with antenna；The transmitting signal of duplexer is represented by:
Wherein, A1' it is the amplitude launching signal.
One the most according to claim 1 high-power THz continuous wave two-dimensional imaging system, it is special
Levy and be: THz continuous wave receiver module (12) includes secondary signal source (309), the second power amplification
Device (310), attenuator (311), the 3rd varactor doubler (312), th harmonic mixer (313), band are logical
Wave filter (314), low-noise amplifier (315) and cymoscope (316), THz continuous wave receives mould
Block (12) is for receiving and processing the THz continuous wave echo-signal from duplexer.
One the most according to claim 6 high-power THz continuous wave two-dimensional imaging system, it is special
Levy and be:
Described secondary signal source (309) be operating frequency be the point-frequency signal source of 27.475GHz, can be with table
It is shown as:
Wherein, A2It is expressed as initial magnitude, f2For frequency 27.475GHz, t is the time,For secondary signal source
(309) initial phase value；
The power of secondary signal source (309) is amplified, further by the second power amplifier (310)
The power of the output signal of the second power amplifier (310) is slightly decayed to reach the 3rd by attenuator (311)
The firm power input range of varactor doubler (312)；3rd varactor doubler (312) is by attenuator (311)
The signal of output carries out two frequencys multiplication to 54.95GHz, and is exported by the signal after two frequencys multiplication to subharmonic and be mixed
Device (313) local oscillator end；The coupled end of directional coupler (307) is connected by th harmonic mixer (313)
To the radio-frequency head of th harmonic mixer (313), now the signal frequency of local oscillator end is 109.9GHz, radio frequency
The signal frequency of end is 110GHz；The signal of th harmonic mixer (313) local oscillator end is represented by
Wherein, A2' it is the amplitude of local oscillator end signal；The signal of subharmonic mixing (313) radio-frequency head is represented by:
Wherein, A1" it is the amplitude of radio-frequency head signal,It it is the initial phase value of radio-frequency head signal；Secondary humorous
The IF output signal of wave mixing device (313) is represented by:
The medium frequency output end of th harmonic mixer (313) is connected to the input of band filter (314)；Band is logical
The mid frequency of wave filter (314) is 100MHz, and the intermediate frequency of th harmonic mixer (313) is exported letter
In number, the clutter beyond 100MHz filters, and the output signal of band filter (314) is represented by:
The outfan of band filter (314) is connected to low-noise amplifier (315)；By band filter (314)
Output signal noise reduce and power amplification with improve 100MHz intermediate-freuqncy signal output, low noise
The output signal of acoustic amplifier (315) is represented by:
Wherein, K is the amplification coefficient of low-noise amplifier,It it is the phase value of signal intensity；Low noise amplification
Device (315) can make the faint intermediate-freuqncy signal through twice down coversion be amplified, and improves output signal
Signal to noise ratio, detectivity, then use defeated by low-noise amplifier (315) of cymoscope (316)
Go out signal and become direct current signal from AC signal, and output it signal and be admitted to data acquisition and processing (DAP) mould
Block.
One the most according to claim 1 high-power THz continuous wave two-dimensional imaging system, it is special
Levy and be: described data acquisition and processing (DAP) module (13) first gathers echo-signal (401), then by echo
Signal carries out data two dimension rearrangement (402), then carries out mean filter (403)；Image processing module (14)
First realize histogram equalization (404), then make contrast stretch (405), then carry out rim detection (406)
With edge sharpening (407), finally give two dimensional image (408).
One the most according to claim 1 high-power THz continuous wave two-dimensional imaging system, it is special
Levy and be: described data acquisition and processing (DAP) module (13) generates the first image (501), image procossing mould afterwards
In block (14), histogram equalization generates the second image (502), stretches generation the by contrast further
Three images (503), generate the 4th image (504) by rim detection, further finally by edge sharpening
Generate the 5th image (505).
(10), the imaging of a kind of high-power THz continuous wave two-dimensional imaging system described in claim 1
Journey comprises the following steps:
The mobile measurand (17) of two-dimensional scan platform (18)；
THz continuous wave transmitter module (12) and duplexer (11) scanning measurand；
THz continuous wave transmitter module (12) generates launches signal；
Transmitting signal is transmitted to measurand (17) by duplexer (11)；
Duplexer (11) receives the echo-signal of measurand (17) surface return and is believed by echo
Number it is sent to THz continuous wave receiver module (12)；
THz continuous wave receiver module (12) processes and is sent to data acquisition and figure to echo-signal
As processing module (13)；
Signal from THz continuous wave receiver module is processed by data acquisition and processing (DAP) module (13)
To generate the two-dimensional imaging of measurand (17)；
Image processing module (14), for processing what data acquisition and processing (DAP) module (13) generated further
Two dimensional image is so that image becomes apparent from；
Image-display units (15) shows the two dimensional image generated by image processing module (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610322075.0A CN105866773B (en) | 2016-05-16 | 2016-05-16 | High-power THz continuous wave two-dimensional imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610322075.0A CN105866773B (en) | 2016-05-16 | 2016-05-16 | High-power THz continuous wave two-dimensional imaging system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105866773A true CN105866773A (en) | 2016-08-17 |
| CN105866773B CN105866773B (en) | 2018-04-06 |
Family
ID=56634229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610322075.0A Expired - Fee Related CN105866773B (en) | 2016-05-16 | 2016-05-16 | High-power THz continuous wave two-dimensional imaging system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105866773B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353834A (en) * | 2016-09-09 | 2017-01-25 | 深圳市太赫兹系统设备有限公司 | Terahertz imaging system and terahertz security device |
| CN106990413A (en) * | 2017-06-02 | 2017-07-28 | 吉林大学 | The system and method for the full coherent Terahertz three-dimension high-resolution imaging of heterodyne system |
| CN107607944A (en) * | 2017-08-29 | 2018-01-19 | 中国人民解放军国防科技大学 | Forward-looking imaging device based on terahertz frequency band transmission type aperture coding |
| CN109031255A (en) * | 2018-09-30 | 2018-12-18 | 清华大学 | The experimental provision of Terahertz radar scattering imaging |
| CN109060713A (en) * | 2018-06-08 | 2018-12-21 | 深圳市华讯方舟太赫兹科技有限公司 | A kind of three-dimensional chromatographic imaging system and method |
| CN109307868A (en) * | 2018-09-20 | 2019-02-05 | 北京遥感设备研究所 | A kind of pulse imaging system and method suitable for terahertz wave band |
| CN109781655A (en) * | 2018-12-25 | 2019-05-21 | 华中科技大学 | A kind of Terahertz CW with frequency modulation fast imaging system and method |
| CN109959938A (en) * | 2019-04-10 | 2019-07-02 | 中国计量大学 | Polythene material terahertz time-domain spectroscopy imaging method based on synthetic aperture focusing |
| CN110736987A (en) * | 2019-10-25 | 2020-01-31 | 合肥中科离子医学技术装备有限公司 | terahertz active imaging scanning system |
| CN113823888A (en) * | 2021-05-06 | 2021-12-21 | 北京理工大学 | Double-frequency matching and second harmonic terahertz frequency mixer based on high-temperature superconducting technology |
| CN115913148A (en) * | 2022-12-28 | 2023-04-04 | 北京无线电测量研究所 | Terahertz power amplification chain device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243167A (en) * | 2011-04-01 | 2011-11-16 | 深圳大学 | Terahertz wave imaging device |
| CN202614666U (en) * | 2012-04-13 | 2012-12-19 | 吴周令 | Two-dimensional Terahertz imaging system |
| CN203224435U (en) * | 2013-01-15 | 2013-10-02 | 首都师范大学 | Terahertz time-space resolved imaging system |
| CN204666829U (en) * | 2015-05-17 | 2015-09-23 | 深圳市一体太赫兹科技有限公司 | A kind of Terahertz safety check warning device based on dsp chip |
| CN205844521U (en) * | 2016-05-16 | 2016-12-28 | 吉林大学 | High-power THz continuous wave two-dimensional imaging system |
-
2016
- 2016-05-16 CN CN201610322075.0A patent/CN105866773B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243167A (en) * | 2011-04-01 | 2011-11-16 | 深圳大学 | Terahertz wave imaging device |
| CN202614666U (en) * | 2012-04-13 | 2012-12-19 | 吴周令 | Two-dimensional Terahertz imaging system |
| CN203224435U (en) * | 2013-01-15 | 2013-10-02 | 首都师范大学 | Terahertz time-space resolved imaging system |
| CN204666829U (en) * | 2015-05-17 | 2015-09-23 | 深圳市一体太赫兹科技有限公司 | A kind of Terahertz safety check warning device based on dsp chip |
| CN205844521U (en) * | 2016-05-16 | 2016-12-28 | 吉林大学 | High-power THz continuous wave two-dimensional imaging system |
Non-Patent Citations (1)
| Title |
|---|
| 赵军凯: "调频连续太赫兹波成像的信号探测与采集系统设计", 《中国优秀硕士学位论文全文数据库 基础科学辑》 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353834B (en) * | 2016-09-09 | 2019-05-03 | 深圳市太赫兹系统设备有限公司 | A kind of terahertz imaging system and Terahertz safety check apparatus |
| CN106353834A (en) * | 2016-09-09 | 2017-01-25 | 深圳市太赫兹系统设备有限公司 | Terahertz imaging system and terahertz security device |
| CN106990413A (en) * | 2017-06-02 | 2017-07-28 | 吉林大学 | The system and method for the full coherent Terahertz three-dimension high-resolution imaging of heterodyne system |
| CN107607944B (en) * | 2017-08-29 | 2020-01-17 | 中国人民解放军国防科技大学 | Forward-looking imaging device based on terahertz frequency band transmission type aperture coding |
| CN107607944A (en) * | 2017-08-29 | 2018-01-19 | 中国人民解放军国防科技大学 | Forward-looking imaging device based on terahertz frequency band transmission type aperture coding |
| CN109060713A (en) * | 2018-06-08 | 2018-12-21 | 深圳市华讯方舟太赫兹科技有限公司 | A kind of three-dimensional chromatographic imaging system and method |
| CN109307868A (en) * | 2018-09-20 | 2019-02-05 | 北京遥感设备研究所 | A kind of pulse imaging system and method suitable for terahertz wave band |
| CN109031255A (en) * | 2018-09-30 | 2018-12-18 | 清华大学 | The experimental provision of Terahertz radar scattering imaging |
| CN109781655A (en) * | 2018-12-25 | 2019-05-21 | 华中科技大学 | A kind of Terahertz CW with frequency modulation fast imaging system and method |
| CN109959938A (en) * | 2019-04-10 | 2019-07-02 | 中国计量大学 | Polythene material terahertz time-domain spectroscopy imaging method based on synthetic aperture focusing |
| CN110736987A (en) * | 2019-10-25 | 2020-01-31 | 合肥中科离子医学技术装备有限公司 | terahertz active imaging scanning system |
| CN113823888A (en) * | 2021-05-06 | 2021-12-21 | 北京理工大学 | Double-frequency matching and second harmonic terahertz frequency mixer based on high-temperature superconducting technology |
| CN113823888B (en) * | 2021-05-06 | 2022-05-17 | 北京理工大学 | Double-frequency matching and second harmonic terahertz frequency mixer based on high-temperature superconducting technology |
| CN115913148A (en) * | 2022-12-28 | 2023-04-04 | 北京无线电测量研究所 | Terahertz power amplification chain device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105866773B (en) | 2018-04-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105866773A (en) | High-power terahertz continuous wave two-dimensional imaging system | |
| CN205844521U (en) | High-power THz continuous wave two-dimensional imaging system | |
| US11313963B2 (en) | Millimeter wave holographic three-dimensional imaging detection system and method | |
| CN106990413A (en) | The system and method for the full coherent Terahertz three-dimension high-resolution imaging of heterodyne system | |
| WO2017107284A1 (en) | Human body security check system and method based on millimeter wave holographic three-dimensional imaging | |
| WO2017107283A1 (en) | Apparatus and method for security check of multiple human bodies based on linear frequency modulation | |
| CN107238868A (en) | Millimeter wave real time imagery safety detecting system and safety detection method | |
| CN108519623A (en) | Foreign body detecting system based on millimetre-wave radar | |
| CN104458645A (en) | Method and system for realizing continuous terahertz spectrum detection | |
| CN207352187U (en) | Millimeter wave real time imagery safety detecting system | |
| CN206832995U (en) | The system of the full coherent Terahertz three-dimension high-resolution imaging of heterodyne system | |
| CN104142499A (en) | Cryptic insect detecting system based on Doppler effect | |
| CN105738315A (en) | Terahertz device for real-time monitoring of biomolecule composition and content and measuring method thereof | |
| Leighton et al. | Radar clutter suppression and target discrimination using twin inverted pulses | |
| Sethy et al. | An introduction to terahertz technology, its history, properties and application | |
| CN106451035B (en) | A kind of terahertz radiation source of stokes light enhancing | |
| Kapilevich et al. | FMCW MM-wave non-imaging sensor for detecting hidden objects | |
| CN110941025A (en) | Portable terahertz security check instrument | |
| CN110108657A (en) | The hypersensitivity mid-long wavelength IR images method and imaging system of room temperature operating | |
| CN113092402B (en) | Non-contact substance terahertz characteristic spectrum detection and identification system and method | |
| CN111123266B (en) | Terahertz wave large-area uniform illumination device and imaging method | |
| CN106253940A (en) | A kind of Terahertz Active Imaging transceiver of integrated on-chip antenna | |
| CN105928953A (en) | Microwave absorption spectrum measurement device and microwave absorption spectrum measurement method based on thermo-acoustic effect and application thereof | |
| CN105629230B (en) | Battlefield vehicle nondestructive detection system and method | |
| Monnai | Terahertz Radar Based on Leaky-Wave Coherence Tomography |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180406 |