CN109283537A - A kind of quasi-optical heterodyne Terahertz target scattering characteristics bistatic measurement system - Google Patents
A kind of quasi-optical heterodyne Terahertz target scattering characteristics bistatic measurement system Download PDFInfo
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- CN109283537A CN109283537A CN201710603589.8A CN201710603589A CN109283537A CN 109283537 A CN109283537 A CN 109283537A CN 201710603589 A CN201710603589 A CN 201710603589A CN 109283537 A CN109283537 A CN 109283537A
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- 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
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
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Abstract
The invention discloses a kind of quasi-optical heterodyne Terahertz target scattering characteristics bistatic measurement systems, include: Fresnel lens A, object to be measured (4), turntable (5), quasi-optical reflection microscope group, Fresnel lens B(8), Fresnel lens C(12), beam splitter (9) and control computer (15), further includes: terahertz signal source (1), Terahertz local vibration source (10), diagonal horn antenna A(2), diagonal horn antenna B(11), quasi-optical heterodyne detector (13) and frequency spectrograph (14).The present invention realizes a kind of bistatic measurement of Terahertz target scattering characteristics by the way of quasi-optical heterodyne reception, compared to the far-infrared laser and photodetector measuring system of Single wavelength output, improve the sensitivity of signal measurement, the complexity of optical path is reduced, measurement result has obtained verification experimental verification.
Description
Technical field
The present invention relates to a kind of Terahertz target scattering characteristics measuring system, especially a kind of quasi-optical heterodyne Terahertz target
Scattering properties bistatic measurement system.
Background technique
The research of Terahertz frequency range target scattering characteristics is the technical foundation that Terahertz Technology is applied to Terahertz radar, due to
THz wave wavelength is extremely short, for physical size centimetre or meter magnitude military target, it has very big in Terahertz frequency range
Electric size, but the electric size very little again compared with near-infrared and laser frequency range, thus will necessarily show and microwave frequency band and sharp
The different scattering properties of optical frequencies, the construction of country's Terahertz experimental measurement system relatively lags behind at present, mainly defeated by Single wavelength
Based on the incoherent measuring system that far-infrared laser and photodetector out is constituted, main composition includes: Submillineter Wave Technology
Device, lens, beam splitter, object to be measured, turntable, off axis paraboloidal mirror, photodetector.Additional reference path all the way is needed to carry out
Outside power calibration, optical path is huger outer；Due also to measurement signal-to-noise ratio is relatively low using direct photoelectricity detection, it is easy by outer
The interference of boundary's environment scattered signal.
Summary of the invention
It is an object of that present invention to provide a kind of quasi-optical heterodyne Terahertz target scattering characteristics bistatic measurement systems, solve terahertz
The problem that the signal-to-noise ratio that hereby wave band incoherent system target scattering characteristics measurement faces is low, optical path is huge.
A kind of quasi-optical heterodyne Terahertz target scattering characteristics bistatic measurement system, comprising: Fresnel lens A, object to be measured,
Turntable, quasi-optical reflection microscope group, Fresnel lens B, Fresnel lens C, beam splitter and control computer, further includes: Terahertz letter
Number source, Terahertz local vibration source, diagonal horn antenna A, diagonal horn antenna B, quasi-optical heterodyne detector and frequency spectrograph.
The quasi-optical reflection microscope group reflects received light beam, converges and deflects, according to optical path occupy volume with
And the distribution situation of measurement target, select the optical device of various combination.Quasi-optical reflection microscope group is made of a pair of of off-axis paraboloidal mirror
Or it is made of one piece of reflecting mirror and one piece of off-axis paraboloidal mirror.
The terahertz signal source for being connected with diagonal horn A, Fresnel lens are sequentially placed by design optical path in signal light road
A, turntable, quasi-optical reflection microscope group and Fresnel lens B；In local oscillator optical path, the Terahertz for being connected with diagonal horn B is sequentially placed
Local vibration source, Fresnel lens C；Beam splitter and signal optical path, local oscillator optical path are at 45oIt places, passes through the semi-transparent semi-reflecting light of beam splitter
Characteristic is learned, the reflected beams of echo-signal synthesize signal output all the way with local oscillation signal transmitted light beam, are coupled to standard by sky feedback
On optical heterodyne detection device.The delivery outlet in terahertz signal source is connect with the input port of diagonal horn A；The output of Terahertz local vibration source
Mouth is connect with the input port of diagonal horn B；When the reference of the reference clock delivery outlet in terahertz signal source and Terahertz local vibration source
The connection of clock input port；The intermediate frequency delivery outlet of quasi-optical heterodyne detector and the rf input port of frequency spectrograph connect；The network interface of computer
With the communication network interface connection of frequency spectrograph；The control mouth of the communication interface and turntable that control computer connects.
In target scattering characteristics test job, signal light road terahertz signal source exports THz wave, passes through diagonal loudspeaker
Antenna A is radiated into Gaussian beam, and Gaussian beam converges in the object to be measured being placed on turntable through Fresnel lens A, to be measured
Target surface scattering, partial dispersion Gaussian beam are reflected by quasi-optical reflection microscope group, deflect, converge to Fresnel lens B；Pass through luxuriant and rich with fragrance alunite
The Gaussian beam of ear lens B converts, and finally converges in the Gaussian beam for carrying target scattering information where beam splitter reflecting surface
Position；Simultaneously in local oscillator optical path, Terahertz local vibration source goes out Gaussian beam by diagonal horn antenna beta radiation, and saturating by Fresnel
Mirror C converges in the transmission plane position of beam splitter；The final optical characteristics semi-transparent semi-reflecting using beam splitter by signal optical path with
Signal exports all the way for Gaussian beam synthesis in local oscillator optical path, is received by quasi-optical heterodyne detector, mixing output intermediate-freuqncy signal；Frequency spectrum
Instrument measures the performance number of signal to intermediate-freuqncy signal real-time detection.Whole process, control computer with the step angle that is arranged and
Revolving speed controls turntable from 0oTo 360oContinuous rotation often goes to an angle position, communicates network interface by frequency spectrograph and reads at this time
Performance number is measured, corresponding angle value and performance number are saved, is rotated by turntable and changes incident angle, it is same to obtain different incidence angles
The scattering data of target under one angle of scattering, the final measurement for realizing object to be measured EM scattering characteristic.
The present invention realizes a kind of bistatic measurement of Terahertz target scattering characteristics, phase by the way of quasi-optical heterodyne reception
Than the far-infrared laser and photodetector measuring system of Single wavelength output, the sensitivity of signal measurement is improved, is reduced
The complexity of optical path, measurement result have obtained verification experimental verification.
Detailed description of the invention
A kind of quasi-optical 1 structural schematic diagram of heterodyne Terahertz target scattering characteristics measuring system embodiment of Fig. 1；
A kind of quasi-optical 2 structural schematic diagram of heterodyne Terahertz target scattering characteristics measuring system embodiment of Fig. 2.
1. 2. diagonal horn antenna A, 3. Fresnel lens A, 4. object to be measured 5. turntable 6. in terahertz signal source is off-axis
9. beam splitter of parabolic mirror A 7. off-axis parabolic mirror B, 8. Fresnel lens B, 10. Terahertz local vibration source 11.
Diagonal horn antenna B 12. Fresnel lens C, 13. quasi-optical 14. frequency spectrograph 15. of heterodyne detector control computers 16. are flat
Face reflecting mirror A.
Specific embodiment
Embodiment 1
A kind of quasi-optical heterodyne Terahertz target scattering characteristics measuring system, comprising: terahertz signal source 1, diagonal horn antenna A2,
Fresnel lens A3, object to be measured 4, turntable 5, off-axis parabolic mirror A6, off-axis parabolic mirror B7, Fresnel lens
B8, beam splitter 9, Terahertz local vibration source 10, diagonal horn antenna B11, Fresnel lens C12, quasi-optical heterodyne detector 13, frequency spectrum
Instrument 14, control computer 15.
Signal light road is sequentially placed the terahertz signal source 1 for being connected with diagonal horn A 2, Fresnel lens A 3, is turned
Platform 5, off-axis parabolic mirror A 6, off-axis parabolic mirror B 7 and Fresnel lens B 8；In local oscillator optical path, sequentially
Place the Terahertz local vibration source 10 for being connected with diagonal horn B 11, Fresnel lens C 12；Beam splitter 9 and signal optical path, local oscillator
Optical path is at 45oIt places, by the semi-transparent semi-reflecting optical characteristics of beam splitter 9, the reflected beams and local oscillation signal of echo-signal are transmitted
Signal exports all the way for light beam synthesis, is coupled on quasi-optical heterodyne detector 13 by sky feedback.The delivery outlet in terahertz signal source 1 with
The input port of diagonal horn A 2 connects；The delivery outlet of Terahertz local vibration source 10 is connect with the input port of diagonal horn B 11；Terahertz
Hereby the reference clock delivery outlet of signal source 1 is connect with the reference clock input port of Terahertz local vibration source 10；Quasi-optical heterodyne detector
13 intermediate frequency delivery outlet is connect with the rf input port of frequency spectrograph 14；The network interface of control computer 15 communicates network interface with frequency spectrograph 14
Connection；The communication interface of control computer 15 is connect with the control mouth of turntable 5.
In target EM scattering characteristic test work, signal light road terahertz signal source 1 exports THz wave, by right
Horn antenna A 2 is radiated into Gaussian beam, and Gaussian beam converges in the object to be measured 4 being placed on turntable 5 through Fresnel lens A3
On
By 4 surface scattering of object to be measured, partial dispersion Gaussian beam is collected by off-axis parabolic mirror A6, collimation is directional light
Beam；Collimated light beam is converged to by off-axis parabolic mirror B 7 up to Fresnel lens B8；Pass through the Gauss of Fresnel lens B
The Gaussian beam for carrying target scattering information is finally converged in the position where 9 reflecting surface of beam splitter by wave beam transformation；Local oscillator simultaneously
In optical path, Terahertz local vibration source 10 gives off Gaussian beam by diagonal horn antenna B 11, and passes through Fresnel lens C's 12
Gaussian beam transformation, converges in the transmission plane position of beam splitter 9.The final optical characteristics semi-transparent semi-reflecting using beam splitter,
The Gaussian beam transmitted in the signal light Gaussian beam that reflects of road and local oscillator optical path is synthesized signal all the way to export, then by
Quasi-optical heterodyne detector 13 receives mixing output intermediate-freuqncy signal, and frequency spectrograph 14 measures signal to intermediate-freuqncy signal real-time detection
Performance number.It controls computer 15 and turntable is controlled from 0 with the step angle of setting and revolving speedoTo 360oMovement, often goes to an angle
Position communicates the measurement performance number of the reading of network interface 14 at this time by frequency spectrograph, corresponding angle value and performance number is saved, by turning
The rotation of platform 5 changes incident angle, obtains the scattering data of target under the same angle of scattering of different incidence angles, finally realizes object to be measured
The measurement of 4 EM scattering characteristics.
Embodiment 2
The quasi-optical heterodyne Terahertz target scattering characteristics measuring system of kind, comprising: terahertz signal source 1, diagonal horn antenna A2, phenanthrene
Alunite ear lens A3, object to be measured 4, turntable 5, plane mirror A16, off-axis parabolic mirror B7, Fresnel lens B8, beam splitting
Mirror 9, Terahertz local vibration source 10, diagonal horn antenna B11, Fresnel lens C12, quasi-optical heterodyne detector 13, frequency spectrograph 14, control
Computer 15 processed.
Signal light road is sequentially placed the terahertz signal source 1 for being connected with diagonal horn A 2, Fresnel lens A 3, is turned
Platform 5, plane mirror A16, off-axis parabolic mirror B 7 and Fresnel lens B 8；In local oscillator optical path, sequentially placement connects
It is connected to the Terahertz local vibration source 10 of diagonal horn B 11, Fresnel lens C 12；Beam splitter 9 and signal optical path, local oscillator optical path at
45oIt places, by the semi-transparent semi-reflecting optical characteristics of beam splitter 9, the reflected beams and local oscillation signal transmitted light beam of echo-signal are closed
It exports at signal all the way, is coupled on quasi-optical heterodyne detector 13 by sky feedback.The delivery outlet in terahertz signal source 1 and diagonal loudspeaker
The input port of A 2 connects；The delivery outlet of Terahertz local vibration source 10 is connect with the input port of diagonal horn B 11；Terahertz signal
The reference clock delivery outlet in source 1 is connect with the reference clock input port of Terahertz local vibration source 10；In quasi-optical heterodyne detector 13
Frequency delivery outlet is connect with the rf input port of frequency spectrograph 14；The network interface of control computer 15 communicates network interface connection with frequency spectrograph 14；
The communication interface of control computer 15 is connect with the control mouth of turntable 5.
In target EM scattering characteristic test work, signal light road terahertz signal source 1 exports THz wave, by right
Horn antenna A 2 is radiated into Gaussian beam, and Gaussian beam converges in the object to be measured 4 being placed on turntable 5 through Fresnel lens A3
On by 4 surface scattering of object to be measured, it is anti-that partial dispersion Gaussian beam is collected by plane mirror A16, reflection reaches off axis paraboloid mirror
Penetrate mirror B 7；It converges to by off-axis parabolic mirror B 7 up to Fresnel lens B8；Pass through the high bass wave of Fresnel lens B
The Gaussian beam for carrying target scattering information is finally converged in the position where 9 reflecting surface of beam splitter by Shu Bianhuan；Local oscillator light simultaneously
On the road, Terahertz local vibration source 10 gives off Gaussian beam by diagonal horn antenna B 11, and passes through the height of Fresnel lens C 12
The transformation of this wave beam, converges in the transmission plane position of beam splitter 9.The final optical characteristics semi-transparent semi-reflecting using beam splitter, will
The Gaussian beam transmitted on the Gaussian beam and local oscillator optical path that signal light road reflects synthesizes signal output all the way, then by quasi-optical
Heterodyne detector 13 receives mixing output intermediate-freuqncy signal, and frequency spectrograph 14 measures the power of signal to intermediate-freuqncy signal real-time detection
Value.It controls computer 15 and turntable is controlled from 0 with the step angle of setting and revolving speedoTo 360oMovement, often goes to an angle position
It sets, the measurement performance number of the reading of network interface 14 at this time is communicated by frequency spectrograph, corresponding angle value and performance number is saved, passes through turntable
5 rotations change incident angle, obtain the scattering data of target under the same angle of scattering of different incidence angles, final to realize object to be measured 4
The measurement of EM scattering characteristic.
Claims (3)
1. a kind of quasi-optical heterodyne Terahertz target scattering characteristics bistatic measurement system, characterized by comprising: Fresnel lens A,
Object to be measured (4), turntable (5), quasi-optical reflection microscope group, Fresnel lens B(8), Fresnel lens C(12), beam splitter (9) and control
Computer (15) processed, further includes: terahertz signal source (1), Terahertz local vibration source (10), diagonal horn antenna A(2), diagonal loudspeaker
Antenna B(11), quasi-optical heterodyne detector (13) and frequency spectrograph (14)；
The quasi-optical reflection microscope group reflects received light beam, converges and deflects, the volume and survey occupied according to optical path
The distribution situation for measuring target, selects the optical device of various combination；Quasi-optical reflection microscope group be made of a pair of of off-axis paraboloidal mirror or
It is made of one piece of reflecting mirror and one piece of off-axis paraboloidal mirror；
The terahertz signal source (1) for being connected with diagonal horn A, Fresnel lens are sequentially placed by design optical path in signal light road
A, turntable (5), quasi-optical reflection microscope group and Fresnel lens B(8)；In local oscillator optical path, sequentially places and be connected with diagonal horn B's
Terahertz local vibration source (10), Fresnel lens C(12)；Beam splitter (9) and signal optical path, local oscillator optical path are at 45oIt places, by dividing
The semi-transparent semi-reflecting optical characteristics of Shu Jing (9), it is defeated that the reflected beams of echo-signal with local oscillation signal transmitted light beam synthesize signal all the way
Out, it is coupled on quasi-optical heterodyne detector (13) by sky feedback；The delivery outlet in terahertz signal source (1) is defeated with diagonal horn A's
Entrance connection；The delivery outlet of Terahertz local vibration source (10) is connect with the input port of diagonal horn B；The ginseng in terahertz signal source (1)
Clock output mouth is examined to connect with the reference clock input port of Terahertz local vibration source (10)；The intermediate frequency of quasi-optical heterodyne detector (13) is defeated
Outlet is connect with the rf input port of frequency spectrograph (14)；The network interface of computer and the communication network interface connection of frequency spectrograph (14)；Control
The communication interface of computer (15) is connect with the control mouth of turntable (5)；
In target scattering characteristics test job, signal light road terahertz signal source (1) exports THz wave, passes through diagonal horn
Antenna A(2) at Gaussian beam, Gaussian beam is converged in through Fresnel lens A in the object to be measured (4) being placed on turntable (5) for radiation,
By object to be measured (4) surface scattering, partial dispersion Gaussian beam is reflected by quasi-optical reflection microscope group, deflects, converges to Fresnel lens B
(8)；It is converted by the Gaussian beam of Fresnel lens B(8), the Gaussian beam for carrying target scattering information is finally converged in into beam splitting
Position where mirror (9) reflecting surface；Simultaneously in local oscillator optical path, Terahertz local vibration source (10) passes through diagonal horn antenna B(11) spoke
Gaussian beam is projected, and converges in the transmission plane position of beam splitter (9) by Fresnel lens C(12)；Finally utilize beam splitting
Signal optical path is synthesized signal output all the way by the semi-transparent semi-reflecting optical characteristics of mirror (9) with the Gaussian beam in local oscillator optical path, quasi-optical
Heterodyne detector (13) receives, mixing output intermediate-freuqncy signal；Frequency spectrograph (14) measures signal to intermediate-freuqncy signal real-time detection
Performance number；Whole process controls computer (15) with the step angle of setting and revolving speed and controls turntable (5) from 0oTo 360oContinuously
Rotation, often goes to an angle position, communicates the measurement performance number of network interface reading at this time by frequency spectrograph (14), saves corresponding
Angle value and performance number are rotated by turntable (5) and change incident angle, and target dissipates under the acquisition same angle of scattering of different incidence angles
Data are penetrated, finally realize the measurement of object to be measured (4) EM scattering characteristic.
2. quasi-optical heterodyne Terahertz target scattering characteristics bistatic measurement system as described in claim 1, it is characterised in that: described
Quasi-optical reflection microscope group is by off-axis parabolic mirror A(6) and off-axis parabolic mirror B(7) it forms.
3. quasi-optical heterodyne Terahertz target scattering characteristics bistatic measurement system as described in claim 1, it is characterised in that: described
Quasi-optical reflection microscope group is by plane mirror A(16) and off-axis parabolic mirror B(7) it forms.
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| CN111175781A (en) * | 2020-01-16 | 2020-05-19 | 中国科学院国家空间科学中心 | Multi-angle multispectral spaceborne ionosphere detection device |
| CN113608175A (en) * | 2021-08-03 | 2021-11-05 | 上海无线电设备研究所 | RCS measurement transceiving system based on quantum cascade |
| CN117970278A (en) * | 2024-04-01 | 2024-05-03 | 北京理工大学 | Terahertz frequency modulation continuous wave RCS measurement system and method |
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