CN205844521U - High-power THz continuous wave two-dimensional imaging system - Google Patents
High-power THz continuous wave two-dimensional imaging system Download PDFInfo
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- CN205844521U CN205844521U CN201620441713.6U CN201620441713U CN205844521U CN 205844521 U CN205844521 U CN 205844521U CN 201620441713 U CN201620441713 U CN 201620441713U CN 205844521 U CN205844521 U CN 205844521U
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Abstract
The utility model discloses a kind of high-power THz continuous wave two-dimensional imaging system, including duplexer, two-dimensional scan platform, THz continuous wave transmitter module, THz continuous wave receiver module, TPX lens, data acquisition and processing (DAP) module, image processing module and image-display units.This utility model has frequency at terahertz wave band, the advantages such as it is high that transmitter module launches power, and system structure is simple, volume is little, and resolution is high.
Description
Technical field
This utility model relates to Terahertz technical field of nondestructive testing, particularly to a kind of high-power active Terahertz even
The system and method for continuous ripple two dimension high-resolution imaging.
Background technology
The terahertz wave band of general appellation, its frequency range is 0.1THz to 10THz (wavelength is from 0.03mm to 3mm)；?
Some occasion refers in particular to 0.3THz to 3THz, is endowed the definition of a kind of broad sense the most sometimes, and its frequency range can comprise up to
The ripple of 100THz, this include whole in, far infrared band.In electromagnetic spectrum, THz wave be positioned at microwave and far infrared wave it
Between, it is in the macroelectronics transition stage to microcosmic photonic propulsion.In person in electronics, the electromagnetic wave of this wave band is claimed again
For millimeter wave or submillimeter wave；In field of spectroscopy, it is also referred to as far ir ray.
Having substantial amounts of terahertz emission source in nature, such as the heat radiation of our most objects at one's side is all too
Hertz wave band.But, owing to lacking high efficiency emission source and sensitive detector, the electricity of terahertz wave band of terahertz wave band
Magnetic radiation does not obtain as microwave in-depth study the same with far infrared wave.Why THz wave causes the research that we are dense
Interest, not merely because it is that a class is widely present but electromagnetic radiation the most well known, more important reason is it
There is a lot of unique character.Specifically, THz wave mainly has a following feature:
1, THz wave has good penetrance for a lot of dielectric materials and nonpolar liquid.The one of terahertz emission
The most attractive individual application prospect is exactly supplementing as x-ray imaging and ultrasound imaging techniques, for safety inspection or
Person carries out nondestructive inspection in quality control.
2, Terahertz Technology has high security, the photon energy having kiloelectron-volt compared to X-ray, terahertz emission
The order of magnitude of photon energy only milli electron volts.The photon energy of THz wave less than the bond energy of various chemical bonds, therefore it
Harmful ionization reaction will not be caused.
3, terahertz wave band contains abundant spectral information.Substantial amounts of molecule, especially organic molecule, owing to it rotates
With the transition of vibration (including that collective is shaken), reveal strong absorption and dispersion characteristics at this band table.
4, THz wave is compared with microwave, and frequency is higher, when as communications carrier, can carry more in the unit interval
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 spatial 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 POP of department of physics of Capital Normal University of China and imaging are in fact
Test room have and THz continuous wave two-dimensional imaging system come into operation.They realize THz continuous wave two-dimensional imaging and use
Method relatively costly, structure is complicated and the restricted condition of imaging resolution is more.
Analyze system currently with vector network analyzer and terahertz time-domain spectroscopy and can realize the two of THz wave
Dimension imaging, but the transmitting power that terahertz time-domain spectroscopy analyzes the transmitter module that system detects testee only has a few milliwatt,
The transmitting power of the transmitter module of vector network analyzer detection testee also only has tens milliwatts, and this will limit Terahertz
The resolution of ripple 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 the higher terahertz of resolution
Hereby continuous wave two-dimensional imaging system.
Summary of the invention
The purpose of this utility model is to provide a kind of structure with high-power THz continuous wave transmitter module as core
Simply, resolution THz continuous wave high, lower-cost two-dimensional imaging system.
This utility model includes:
Duplexer, for measurand measured surface send THz continuous wave launch signal and receive from
The echo-signal that the measured surface of measurand returns；
Two-dimensional scan platform, for fixing on two dimensional surface and mobile measurand；
THz continuous wave transmitter module, launches signal for generating the THz continuous wave being sent to measurand；
THz continuous wave receiver module, for receiving and processing the THz continuous wave echo from duplexer
Signal；
TPX lens, including TPX lens I and TPX lens II, for the terahertz launched by THz continuous wave transmitter module
Hereby continuous wave first passes through TPX lens I and becomes parallel, then converges to the measured surface of measurand through TPX lens II；Or
Become parallel for the THz continuous wave that the measured surface of measurand reflects is first passed through TPX lens II, then through TPX
Lens I converge to described duplexer；
Data acquisition and processing (DAP) module, for gathering and processing the echo-signal from the output of THz continuous wave receiver module
To generate the two dimensional image of the measured surface of measurand；
Image processing module, for processing further two dimensional image that data acquisition and processing (DAP) module generates so that image more
It is clear to add；
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 I, by terahertz by duplexer
Hereby continuous wave becomes parallel；Further, THz wave passes through TPX lens II, converges to THz continuous wave with splitting
The measured surface of the measurand of gap.
The described distance between TPX lens I and TPX lens II is less than the focal length of TPX lens.TPX lens I are saturating with TPX
Mirror II is identical, and TPX lens I are staggered relatively with TPX lens II.
THz continuous wave transmitter module include the first signal source, the first power amplifier, the first varactor doubler, the two or two
Doubler, adjustable attenuator, isolator and directional coupler, it is tested right that THz continuous wave transmitter module is sent to for generation
The THz continuous wave of elephant launches signal.
Specifically, the first signal source 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 it is the initial phase of the first signal source
Value.
Second power amplifier is amplified reaching the firm power of the first varactor doubler to the power of the first signal source
Input range, after the first varactor doubler, the frequency of signal reaches 55GHz, further across signal after the second varactor doubler
Frequency reaches 110GHz.First varactor doubler and the second varactor doubler are all active devices, launch the high-power of signal and are mainly
By the two varactor doubler transformation efficiency height determine (select the first varactor doubler be VDI company model be the high power of D60
Arrowband doubler, the conversion efficiency at 55GHz frequency is more than 30%；Second varactor doubler be VDI company model be D110
High power arrowband 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 the second varactor doubler
Output realize reduction in various degree by the knob of regulation adjustable attenuator, and by the output signal of adjustable attenuator
Output is to isolator；The echo-signal isolation that the straight-through end of directional coupler is returned by isolator is to prevent echo-signal from inputting extremely
Described adjustable attenuator, the outfan of adjustable attenuator is connected to the input of isolator, and the outfan of isolator is connected to fixed
To the input of bonder；The straight-through end of adjustable attenuator is connected to the input of directional coupler by directional coupler, will be fixed
It is connected to duplexer to the straight-through end of bonder；Finally send through duplexer.Duplexer
Transmitting signal is represented by:
Wherein, A1' it is the amplitude launching signal.
THz continuous wave receiver module includes secondary signal source, the second power amplifier, attenuator, the three or two frequency multiplication
Device, th harmonic mixer, band filter, low-noise amplifier and cymoscope, THz continuous wave receiver module is used for receiving
With process from the THz continuous wave echo-signal of duplexer.
Specifically, secondary signal source be operating frequency be the point-frequency signal source of 27.475GHz, can be expressed as:
Wherein, A2It is expressed as initial magnitude, f2For frequency 27.475GHz, t is the time,Initial for secondary signal source
Phase value.
The power in secondary signal source is amplified by the second power amplifier, and attenuator is by the second power amplification further
The power of the output signal of device slightly decays to reach the firm power input range of the 3rd varactor doubler；3rd varactor doubler will decline
Subtract the signal of device output and carry out two frequencys multiplication to 54.95GHz, and the signal after two frequencys multiplication is exported to th harmonic mixer local oscillator
End；The coupled end of directional coupler is connected to the radio-frequency head of th harmonic mixer, the now letter of local oscillator end by th harmonic mixer
Number frequency is 109.9GHz, and the signal frequency of radio-frequency head is 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 th harmonic mixer 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.Th harmonic mixer
IF output signal be represented by:
The medium frequency output end of th harmonic mixer is connected to the input of band filter；The mid frequency of band filter
For 100MHz, the clutter beyond 100MHz in the IF output signal of th harmonic mixer is filtered, band filter 314 defeated
Go out signal to be represented by:
The outfan of band filter is connected to low-noise amplifier；The noise of the output signal of band filter is reduced
And power amplification is to improve the output of 100MHz intermediate-freuqncy signal, the output signal of low-noise amplifier is represented by:
Wherein, K is the amplification coefficient of low-noise amplifier,It it is the phase value of signal intensity.Low-noise amplifier can
Make the faint intermediate-freuqncy signal through twice down coversion be amplified, improve the signal to noise ratio of output signal, detectivity, then
Use cymoscope that from AC signal the output signal of low-noise amplifier become 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 rearrangement, then
Carry out mean filter.Image processing module first realizes histogram equalization, then makes contrast stretch, then carry out rim detection and
Edge sharpening, finally gives two dimensional image.
Generating the first image after data acquisition and processing (DAP) module, in image processing module, histogram equalization generates the second figure
Picture, is stretched by contrast further and generates the 3rd image, generate the 4th image by rim detection further, finally by limit
Edge sharpens and generates the 5th image.
Utilize above-mentioned high-power THz continuous wave two-dimensional imaging system that the imaging process of measurand is included following step
Rapid:
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 Terahertz even
Continuous ripple receiver module；
THz continuous wave receiver module processes and is sent to data acquisition and image processing module to echo-signal；
Signal from THz continuous wave receiver module is processed to generate tested by data acquisition and processing (DAP) module
The two-dimensional imaging of object；
Image processing module, for processing further two dimensional image that data acquisition and processing (DAP) module generates so that image more
It is clear to add；
Image-display units shows the two dimensional image generated by image processing module.
The beneficial effects of the utility model:
(1) cost is relatively low: this utility model utilizes electronic device not use optical element (except TPX lens), significantly drops
The low cost of system.
(2) simple in construction, easy of integration: the device body such as power amplifier, doubler and the bonder that this utility model uses
Long-pending little and system circuit structure is simple, compares and utilizes the imaging system complexity of the devices such as chopper low before.
(3) THz continuous wave transmitter module power is big: the performance number of THz continuous wave transmitter module is left at 200mW
Right.
(4) imaging resolution is high: this utility model uses frequency multiplication mode to obtain the frequency of 110GHz, and the doubler of use is
The active device that conversion efficiency is high, which greatly enhances the transmitting power of THz continuous wave transmitter module, thus imaging is differentiated
Rate can reach about 2mm.
(5) image taking speed is fast: this utility model uses THz continuous wave imaging, it is not necessary to as terahertz pulse imaging one
Sample considers the degree of depth and the information of frequency spectrum, simpler in terms of imaging algorithm, which greatly enhances image taking speed.
(6) long transmission distance: the THz continuous wave signal that this utility model is launched by THz continuous wave transmitter module
Aerial transmission range can reach nearly hundred meters.
(7) signal to noise ratio is high: system uses active terahertz imaging, comes by controlling the output power range of each device
Improve the transmitting power of antenna, certainly, launch power within safe radiation scope so that echo-signal signal to noise ratio is significantly larger than
Passive type terahertz imaging system receives the signal to noise ratio of signal, and then obtains higher image quality.
(8) of many uses: to utilize high-power THz continuous wave two-dimensional imaging technique high-resolution and simple in construction etc. excellent
Point, can carry out the detection of all kinds of large-scale instrument outer layer damage, be also applied for the detection of contraband.
Accompanying drawing explanation
Fig. 1 is composition frame chart of the present utility model.
Fig. 2 is structural representation of the present utility model.
Fig. 3 is the circuit diagram of transmitter module of the present utility model and receiver module.
Fig. 4 is the two-dimensional imaging algorithm carried out in data acquisition and processing (DAP) module of the present utility model and image processing module
Flow chart.
Fig. 5 is the comparison diagram of data acquisition and processing (DAP) module of the present utility model and image processing module imaging effect.
Fig. 6 is the flow chart of imaging process of the present utility model.
Detailed description of the invention
Terahertz imaging system is broadly divided into terahertz pulse imaging and THz continuous wave imaging.Terahertz pulse imaging
Ultimate principle be: contain the space of the complex dielectric permittivity of sample from the intensity of terahertz electromagnetic wave of sample reflection and phase place
Distributed intelligence.The intensity of reflected terahertz hereby electromagnetic wave and the two-dimensional signal of phase place are recorded, and through suitable process and
Analyze the Terahertz image obtaining sample.The ultimate principle of THz continuous wave imaging is: wave source provides than pulse source more continuously
High radiant intensity, its essence is a kind of intensity imaging.When to image objects, according to defect or the limit of damage of interior of articles
The edge scattering effect to terahertz light, thus the intensity distributions of THz wave electromagnetic field can be affected, the Terahertz of reflection to object
It is shown as the light and shade i.e. difference of intensity on ripple image, the shape of interior of articles, defect or damage position can be released accordingly.Therefore,
In the case of without the degree of depth and spectrum information, use THz continuous wave imaging technique, THz wave imaging can be improved
Speed also reduces the complexity of imaging system.
As depicted in figs. 1 and 2, this utility model includes:
Duplexer 11, launches signal for sending THz continuous wave to the measured surface of measurand 17 and connects
Receive 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, launches letter for generating the THz continuous wave being sent to measurand 17
Number；
THz continuous wave receiver module 12, for receiving and processing the THz continuous wave from duplexer 11
Echo-signal；
TPX lens 16, including TPX lens I 25 and TPX lens II 26, for by THz continuous wave transmitter module 10
The THz continuous wave penetrated first passes through TPX lens I 25 and becomes parallel, then converges to measurand 17 through TPX lens II 26
Measured surface；Or for the THz continuous wave that the measured surface of measurand 17 reflects is first passed through TPX lens II 26
Become parallel, then converge to described duplexer 11 through TPX lens I 25；
Data acquisition and processing (DAP) module 13, for gathering and process the echo letter from the output of THz continuous wave receiver module
Number to generate the two dimensional image of measured surface 23 of measurand 17；
Image processing module 14, for processing the two dimensional image of data acquisition and processing (DAP) module 13 generation further so that scheming
As becoming 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, the transmitting signal from THz continuous wave transmitter module 10 is launched extremely by duplexer 11
TPX lens I 25, become THz continuous wave into parallel；Further, THz wave passes through TPX lens II 26, by Terahertz
Continuous wave converges to the measured surface 23 of the measurand 17 with crack 24.
The described distance between TPX lens I 25 and TPX lens II 26 is less than the focal length of TPX lens 16.TPX lens I 25
Identical with TPX lens II 26, TPX lens I 25 are staggered relatively with TPX lens II 26.
As it is shown on figure 3, THz continuous wave transmitter module 10 include first signal source the 301, first power amplifier 302,
First varactor doubler the 303, second varactor doubler 304, adjustable attenuator 305, isolator 306 and directional coupler 307, Terahertz
Continuous wave transmitter module 10 launches signal for generating the THz continuous wave being sent to measurand.
Specifically, the 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 initial of the first signal source 301
Phase value.
The power of the first signal source 301 is amplified reaching the first varactor doubler 303 by the second power amplifier 302
Firm power input range, after the first varactor doubler 303, the frequency of signal reaches 55GHz, further across the two or two times
Frequently after device 304, the frequency of signal reaches 110GHz.First varactor doubler 303 and the second varactor doubler 304 are all active devices, send out
Penetrating the high-power of signal mainly (is selected the first varactor doubler 303 to be by what the transformation efficiency height of the two varactor doubler determined
VDI company model is the high power arrowband doubler of D60, and the conversion efficiency at 55GHz frequency is more than 30%；Two or two times
Frequently device 304 be VDI company model be the high power arrowband doubler of D110, the conversion efficiency at 110GHz frequency is 25%).
Signal after two frequencys multiplication is exported to adjustable attenuator 305 by the second varactor doubler 304；Adjustable attenuator 305 is by
The output of two varactor doublers 304 realizes reduction in various degree by the knob of regulation adjustable attenuator 305, and by adjustable
The output signal of attenuator 305 exports to isolator 306；The echo that the straight-through end of directional coupler 307 is returned by isolator 306
Signal isolation is to prevent echo-signal input to described adjustable attenuator 305, and the outfan of adjustable attenuator 305 is connected to isolation
The input of device 306, the outfan of isolator 306 is connected to the input of directional coupler 307；Directional coupler 307 can
The straight-through end of controlled attenuator 305 is connected to the input of directional coupler 307, is connected to by the straight-through end of directional coupler 307
Duplexer 11；Finally send through duplexer 11.The transmitting signal of duplexer 11 is represented by:
The straight-through end of directional coupler 307 is connected to described duplexer；Finally send through duplexer
Go out.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 includes that secondary signal source the 309, second power is put
Big device 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 receive and process from duplexer Terahertz even
Continuous ripple echo-signal.
Specifically, secondary signal source 309 be operating frequency be the point-frequency signal source of 27.475GHz, can be expressed as:
Wherein, A2It is expressed as initial magnitude, f2For frequency 27.475GHz, t is the time,At the beginning of secondary signal source 309
Beginning phase value.
The power in secondary signal source 309 is amplified by the second power amplifier 310, and attenuator 311 is by further
The power of the output signal of two power amplifiers 310 slightly decays to reach the firm power input range of the 3rd varactor doubler 312；
The signal that attenuator 311 is exported by the 3rd varactor doubler 312 carries out two frequencys multiplication to 54.95GHz, and by defeated for the signal after two frequencys multiplication
Go out to th harmonic mixer 313 local oscillator end；The coupled end of directional coupler 307 is connected to subharmonic by th harmonic mixer 313
The radio-frequency head of frequency mixer 313, 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.The signal of th harmonic mixer 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.Th harmonic mixer 313
IF output signal be represented by:
The medium frequency output end of th harmonic mixer 313 is connected to the input of band filter 314；Band filter 314
Mid frequency be 100MHz, the clutter beyond 100MHz in the IF output signal of th harmonic mixer 313 is filtered, band is logical
The output signal of wave filter 314 is represented by:
The outfan of band filter 314 is connected to low-noise amplifier 315；Output signal by band filter 314
Noise reduce and power amplification with improve 100MHz intermediate-freuqncy signal output, the output signal of low-noise amplifier 315
It is represented by:
Wherein, K is the amplification coefficient of low-noise amplifier,It it is the phase value of signal intensity.Low-noise amplifier 315
The faint intermediate-freuqncy signal through twice down coversion can be made to be amplified, improve the signal to noise ratio of output signal, detectivity,
Then use cymoscope 316 that from AC signal, the output signal of low-noise amplifier 315 is become direct current signal, and output it
Signal is 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 number
Reset 402 according to two dimension, then carry out mean filter 403.Image processing module 14 first realizes histogram equalization 404, then make right
Stretch 405 than degree, then carry out rim detection 406 and edge sharpening 407, finally give two dimensional image 408.
As it is shown in figure 5, generate the first image 501, Nogata in image processing module 14 after data acquisition and processing (DAP) module 13
Figure equalization generates the second image 502, is stretched by contrast further and generates the 3rd image 503, is examined by edge further
Survey and generate the 4th image 504, generate the 5th image 505 finally by edge sharpening.
As shown in Figure 6, the above-mentioned high-power THz continuous wave two-dimensional imaging system imaging process to measurand is utilized
Comprise 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 to terahertz
Hereby continuous wave receiver module 12；
THz continuous wave receiver module 12 processes to echo-signal and is sent to data acquisition and image procossing mould
Block 13；
Signal from THz continuous wave receiver module is processed to generate quilt by data acquisition and processing (DAP) module 13
Survey the two-dimensional imaging of object 17；
Image processing module 14, for processing the two dimensional image of data acquisition and processing (DAP) module 13 generation further so that scheming
As becoming apparent from；
Image-display units 15 shows the two dimensional image generated by image processing module 14.
Claims (7)
1. a high-power THz continuous wave two-dimensional imaging system, it is characterised in that: include:
Duplexer (11), launches signal for sending THz continuous wave to the measured surface of measurand (17) and connects
Receive 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), the THz continuous wave being sent to measurand (17) for generation launches letter
Number；
THz continuous wave receiver module (12), for receiving and processing the THz continuous wave from duplexer (11)
Echo-signal；
TPX lens (16), including TPX lens I (25) and TPX lens II (26), for by THz continuous wave transmitter module
(10) THz continuous wave launched first passes through TPX lens I (25) and becomes parallel, then converges to through TPX lens II (26)
The measured surface of measurand (17)；Or for the THz continuous wave elder generation warp that the measured surface of measurand (17) is reflected
Cross TPX lens II (26) and become parallel, then converge to described duplexer (11) through TPX lens I (25)；
Data acquisition and processing (DAP) module (13), for gathering and processing the echo-signal from the output of THz continuous wave receiver module
To generate the two dimensional image of the measured surface (23) of measurand (17)；
Image processing module (14), the two dimensional image generated for further process data acquisition and processing (DAP) module (13) is so that scheming
As becoming 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 characterised in that: described receipts
Send out common antenna (11) to launch to TPX lens I (25) from the transmitting signal of THz continuous wave transmitter module (10), will too
Hertz continuous wave becomes parallel；THz wave passes through TPX lens II (26), converges to THz continuous wave with crack
(24) measured surface (23) of measurand (17).
One the most according to claim 1 high-power THz continuous wave two-dimensional imaging system, it is characterised in that: described
Distance between TPX lens I (25) and TPX lens II (26) is less than the focal length of TPX lens (16)；Described TPX lens I (25) with
TPX lens II (26) are staggered relatively.
One the most according to claim 1 high-power THz continuous wave two-dimensional imaging system, it is characterised in that: described
THz continuous wave transmitter module (10) includes the first signal source (301), the first power amplifier (302), the first varactor doubler
(303), the second varactor doubler (304), adjustable attenuator (305), isolator (306) and directional coupler (307), Terahertz company
Continuous ripple transmitter module (10) launches signal for generating the THz continuous wave being sent to measurand.
One the most according to claim 4 high-power THz continuous wave two-dimensional imaging system, it is characterised in that:
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 it is the initial phase of the first signal source (301)
Place value；
The power of the first signal source (301) is amplified reaching the first varactor doubler (303) by the second power amplifier (302)
Firm power input range, after the first varactor doubler (303), the frequency of signal reaches 55GHz, further across second
The frequency of varactor doubler (304) signal afterwards reaches 110GHz；First varactor doubler (303) and the second varactor doubler (304) are all
Active device, launches the high-power mainly by the transformation efficiency height decision of the two varactor doubler of signal；
Signal after two frequencys multiplication is exported to adjustable attenuator (305) by the second varactor doubler (304)；Adjustable attenuator (305) will
The output of the second varactor doubler (304) realizes reduction in various degree by the knob of regulation adjustable attenuator (305), and
The output signal of adjustable attenuator (305) is exported to isolator (306)；Isolator (306) is by directional coupler (307)
The echo-signal isolation that straight-through end returns is to prevent echo-signal input to described adjustable attenuator (305), adjustable attenuator
(305) outfan is connected to the input of isolator (306), and the outfan of isolator (306) is connected to directional coupler
(307) input；The straight-through end of adjustable attenuator (305) is connected to directional coupler (307) by directional coupler (307)
Input, is connected to duplexer (11) by the straight-through end of directional coupler (307)；Final through duplexer (11)
Send；The transmitting signal of duplexer (11) is represented by:
The straight-through end of directional coupler (307) is connected to described duplexer；Finally send out through duplexer
Go；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 characterised in that: Terahertz
Continuous wave receiver module (12) include secondary signal source (309), the second power amplifier (310), attenuator (311), the three or two
Doubler (312), th harmonic mixer (313), band filter (314), low-noise amplifier (315) and cymoscope (316),
THz continuous wave receiver module (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 characterised in that:
Described secondary signal source (309) be operating frequency be the point-frequency signal source of 27.475GHz, can be expressed as:
Wherein, A2It is expressed as initial magnitude, f2For frequency 27.475GHz, t is the time,Initial for secondary signal source (309)
Phase value；
The power of secondary signal source (309) is amplified by the second power amplifier (310), and attenuator (311) will further
The firm power that the power of the output signal of the second power amplifier (310) slightly decays to reach the 3rd varactor doubler (312) is defeated
Enter scope；The signal that attenuator (311) exports is carried out two frequencys multiplication to 54.95GHz by the 3rd varactor doubler (312), and by two times
Signal after Pin exports to th harmonic mixer (313) local oscillator end；Th harmonic mixer (313) is by directional coupler (307)
Coupled end is connected to the radio-frequency head of th harmonic mixer (313), and now the signal frequency of local oscillator end is 109.9GHz, radio-frequency head
Signal frequency 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 th harmonic mixer (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 filter
(314) mid frequency is 100MHz, is filtered by the clutter beyond 100MHz in the IF output signal of th harmonic mixer (313)
Removing, the output signal of band filter (314) is represented by:
The outfan of band filter (314) is connected to low-noise amplifier (315)；The output of band filter (314) is believed
Number noise reduce and power amplification with improve 100MHz intermediate-freuqncy signal output, the output of low-noise amplifier (315)
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 amplifier (315) energy
Enough make the faint intermediate-freuqncy signal through twice down coversion be amplified, improve the signal to noise ratio of output signal, detectivity,
Then use cymoscope (316) that from AC signal, the output signal of low-noise amplifier (315) is become direct current signal, and by it
Output signal is admitted to data acquisition and processing (DAP) module.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866773A (en) * | 2016-05-16 | 2016-08-17 | 吉林大学 | High-power terahertz continuous wave two-dimensional imaging system |
| CN108828683A (en) * | 2018-06-14 | 2018-11-16 | 江苏心磁超导体有限公司 | Terahertz safe examination system |
| CN109030404A (en) * | 2018-08-24 | 2018-12-18 | 代广斌 | A kind of scattering formula Terahertz near-field microscope based on radio-frequency electronics 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 |
| CN110703054A (en) * | 2019-10-29 | 2020-01-17 | 山东省科学院自动化研究所 | Sample dielectric property testing device and method based on terahertz free space method |
-
2016
- 2016-05-16 CN CN201620441713.6U patent/CN205844521U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866773A (en) * | 2016-05-16 | 2016-08-17 | 吉林大学 | High-power terahertz continuous wave two-dimensional imaging system |
| CN108828683A (en) * | 2018-06-14 | 2018-11-16 | 江苏心磁超导体有限公司 | Terahertz safe examination system |
| CN109030404A (en) * | 2018-08-24 | 2018-12-18 | 代广斌 | A kind of scattering formula Terahertz near-field microscope based on radio-frequency electronics method |
| CN109030404B (en) * | 2018-08-24 | 2020-09-18 | 代广斌 | Scattering type terahertz near-field microscope based on radio frequency electronics 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 |
| CN110703054A (en) * | 2019-10-29 | 2020-01-17 | 山东省科学院自动化研究所 | Sample dielectric property testing device and method based on terahertz free space method |
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