CN104819952B - It is a kind of to be used to measure method and system of the material in terahertz wave band polarization characteristic - Google Patents
It is a kind of to be used to measure method and system of the material in terahertz wave band polarization characteristic Download PDFInfo
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- CN104819952B CN104819952B CN201510183036.2A CN201510183036A CN104819952B CN 104819952 B CN104819952 B CN 104819952B CN 201510183036 A CN201510183036 A CN 201510183036A CN 104819952 B CN104819952 B CN 104819952B
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Abstract
It is used to measure method and system of the material in terahertz wave band polarization characteristic the invention discloses a kind of, the orthogonal signalling received are acquired using ortho mode transducer, while being calibrated using calibration algorithm by the amplitude-phase of the cross polarization of ortho mode transducer, quadrature receiving two paths of signals is inconsistent；After calibration, when measuring detected materials, the amplitude after wait the amount of measuring and monitoring the growth of standing timber and phase are calculated according to the parameter after calibration, so as to draw polarization characteristic of the detected materials for measured THz wave；The present invention largely eliminates the effects of the act, and greatly improves the precision and dynamic range of measurement.
Description
Technical field
It is particularly a kind of to be used to measure method of the material in terahertz wave band polarization characteristic the present invention relates to Terahertz Technology
And system.
Technical background
It is to use detection side in receiving terminal currently used for material is measured in the method that terahertz wave band polarization characteristic is used
Formula, Gaussian beam pattern of the transmitting terminal transmitting with linear polarization realizes that it is constituted as shown in Figure 1-2.
Realize there are several shortcomings using detecting way：One is that wave detector can only obtain the amplitude information of THz wave, and
Corresponding phase information will lose, and can only so calculate polarized rotation characteristic of the THz wave by material, and can not measure
Its phase response characteristic to different polarization；Two be wave detector noise it is higher, poor sensitivity, it is impossible to be used in measurement polarization loss
The big material of small or absorption loss；Three be that measurement accuracy is not high, because the calibration method of such a scheme is simple, it is impossible to it is accurate compared with
The accurate measurement error caused by level (V), vertical (H) two-way are inconsistent, causes measurement accuracy poor.
The content of the invention
Present invention proposition is a kind of to be used to measure method and system of the material in terahertz wave band polarization characteristic, using orthogonal mode
Formula converter is separated the orthogonal signalling received, and detects the quadrature signal amplitude received and phase using super-heterodyne technique
Position；From unlike traditional method, the present invention received signal is acquired by the way of quadrature sampling, while sharp
School is carried out by the amplitude-phase of the cross polarization of ortho mode transducer, quadrature receiving two paths of signals is inconsistent with calibration algorithm
Standard, so as to largely eliminate their influence, greatly improves the precision and dynamic range of measurement.
Technical scheme is as follows：
It is a kind of to be used to measure method of the material in terahertz wave band polarization characteristic, it is characterised in that step is as follows：
The orthogonal signalling received are acquired by the way of quadrature sampling, while using calibration algorithm by orthogonal mode
The cross polarization of formula converter (OMT), the amplitude-phase of quadrature receiving two paths of signals is inconsistent is calibrated；After calibration,
When measuring detected materials, the amplitude after wait the amount of measuring and monitoring the growth of standing timber and phase are calculated according to the parameter after calibration, treated so as to draw
Measure and monitor the growth of standing timber material for measured THz wave polarization characteristic.
The calibration algorithm being related in the above method is specific as follows：
It is assumed that the signal that vertical polarization passage (V passages) is received is vV, horizontal polarization passage (H passages) receive signal be
vH, their expression formula is shown in formula (1)：
A in formulav、AHExpression amplitude, φv、φHRepresent phase, αVHRepresent that vertical (V), level (H) channel imbalance cause
Amplitude difference, φVHRepresent the difference of V, H passage, αH→VRepresent that H passages are leaked to the signal intensity of V passages, αV→HRepresent V passages
It is leaked to the signal intensity of H passages, αV→HRepresent that V passages are leaked to the phase of the signal of H passages, φV→HRepresent that V passages lead to H
The phase of road leakage signal.
The component needed is AVcos(ωt+φV) and AH cos(ωt+φH), remaining ginseng is obtained by way of calibration
Number, and eliminated the influence of remaining parameter by the method for mathematical computations.
Transmitting terminal uses the Gaussian beam of linear polarization, and in the case where not adding measured material, calibration process is as follows：
1. transmitting terminal launches vertical polarization signal, the horizontal useful signal A of receiving terminalH cos(ωt+φH) it is 0, substitute into formula
(1) the horizontal signal v that now receiver is received, is obtainedH1As vertically to level leakage：
vH1=αV→Hcos(ωt+φV→H) (2)
2. the signal that transmitting terminal emission level polarizes, the vertical useful signal A of receiving terminalVcos(ωt+φV) it is 0, substitute into
Formula (1), obtains the vertical signal v that now receiver is receivedV2As level is revealed to vertical：
vV2=αH→Vcos(ωt+φV→H) (3)
3. transmitting terminal launches the signal of 45 ° of polarization, i.e., should have
AH cos(ωt+φH)=AVcos(ωt+φV) (4)
It is assumed that the signal respectively v that now receiver is receivedV3、vH3, then have
Simultaneous (2), (3), (4), (5) formula solve the unknown parameter in (1) formula；
After calibration, when measuring detected materials, the A after wait the amount of measuring and monitoring the growth of standing timber is calculated according to the parameter after calibrationV、
AH、φV、φH, so as to calculate polarization characteristic of the material for measured THz wave.
For the above method for measuring system of the material in terahertz wave band polarization characteristic, it is characterised in that：It is overall
Be made up of transmitting terminal and receiving terminal, receiving terminal include orthogonal signalling receiving unit, V signal detection unit, H signal detection unit,
Signal is divided into V signal and H by local oscillator frequency multiplier chain and signal processing unit, orthogonal signalling receiving unit using ortho mode transducer
Signal, is then detected using superhet form to V signal, H signal, and the output end of local oscillator frequency multiplier chain is respectively connecting to V letters
Number detection unit and H signal detection unit, the output end of V signal detection unit and the output end of H signal detection unit are all connected with
To signal processing unit.
The local oscillator frequency multiplier chain includes local vibration source, several frequency multipliers and power splitter, and several frequency multipliers are sequentially connected in series, this
The output end of vibration source is connected to the input of the frequency multiplier of series connection, and the output end of the input of the frequency multiplier of series connection is connected to work(point
Device, the output end of power splitter is respectively connecting to V signal detection unit and H signal detection unit.
The V signal detection unit includes harmonic mixer one, low noise amplification module one, wave filter one and attenuator one, humorous
The output end of wave mixing device one is connected to low noise amplification module one, and the output end of low noise amplification module one is connected to wave filter one, filtering
The output end of device one is connected to attenuator one, and the output end of attenuator one is connected to signal processing unit；The orthogonal modes becomes
The output end of parallel operation and the output end of power splitter are connected to the harmonic mixer one of V signal detection unit.
The H signal detection unit includes harmonic mixer two, low noise amplification module two, wave filter two and attenuator two, humorous
The output end of wave mixing device two is connected to low noise amplification module two, and the output end of low noise amplification module two is connected to wave filter two, filtering
The output end of device two is connected to attenuator two, and the output end of attenuator two is connected to signal processing unit；The orthogonal modes becomes
The output end of parallel operation and the output end of power splitter are connected to the harmonic mixer two of H signal detection unit.
Beneficial effects of the present invention are as follows：
1. the present invention uses superheterodyne reception mode, system sensitivity and measurement dynamic range can be improved；
2. retaining the phase information of terahertz signal, material property can be more preferably obtained, no information is lost.
3. being calibrated using the method for quadrature sampling to system, measurement accuracy is improved.
Brief description of the drawings
Fig. 1 is the schematic diagram of traditional transmitting terminal；
Fig. 2 is the schematic diagram of traditional receiving terminal；
Fig. 3 is the schematic diagram of the transmitting terminal of the present invention；
Fig. 4 is the schematic diagram of the receiving terminal of the present invention；
Schematic diagram when Fig. 5 is calibration of the invention.
Embodiment
A kind of to be used to measure method of the material in terahertz wave band polarization characteristic, it is comprised the following steps that：
It is assumed that the signal of vertical polarization channel reception is vV, the signal of horizontal polarization channel reception is vH, their expression formula
For formula (1) Suo Shi：
A in formulav、AHExpression amplitude, φv、φHRepresent phase, αVHRepresent that vertical (V), level (H) channel imbalance cause
Amplitude difference, φVHRepresent the difference of V, H passage, αH→VRepresent that H passages are leaked to the signal intensity of V passages, αV→HRepresent V passages
It is leaked to the signal intensity of H passages, αV→HRepresent that V passages are leaked to the phase of the signal of H passages, φV→HRepresent that V passages lead to H
The phase of road leakage signal.
The component needed is AVcos(ωt+φV) and AH cos(ωt+φH), parameter is obtained by way of calibration.
For the above method for measuring system of the material in terahertz wave band polarization characteristic, as shown in Figure 3-4, including
Transmitting terminal and receiving terminal, receiving terminal include orthogonal signalling receiving unit, V signal detection unit, H signal detection unit, local oscillator times
Frequency chain and signal processing unit, orthogonal signalling receiving unit are provided with ortho mode transducer, the output of ortho mode transducer
End is respectively connecting to V signal detection unit and H signal detection unit, and the output end of local oscillator frequency multiplier chain is respectively connecting to V signal inspection
Unit and H signal detection unit are surveyed, the output end of V signal detection unit and the output end of H signal detection unit are connected to letter
Number processing unit.
The local oscillator frequency multiplier chain includes local vibration source, several frequency multipliers and power splitter, and several frequency multipliers are sequentially connected in series, this
The output end of vibration source is connected to the input of the frequency multiplier of series connection, and the output end of the input of the frequency multiplier of series connection is connected to work(point
Device, the output end of power splitter is respectively connecting to V signal detection unit and H signal detection unit.
The V signal detection unit is identical with the structure of H signal detection unit, including harmonic mixer, LNA mould
Block, wave filter and attenuator, connected mode successively are also consistent, are all that the output end of harmonic mixer is connected to LNA mould
Block, the output end of low noise amplification module is connected to wave filter, and the output end of wave filter is connected to attenuator, and the output end of attenuator connects
It is connected to signal processing unit.
For the V signal detection unit and H signal detection unit of said structure, the output end and work(of ortho mode transducer
The output end of device is divided to be connected to the harmonic mixer of V signal detection unit and the harmonic mixer of H signal detection unit.
Transmitting terminal uses the Gaussian beam of linear polarization, and in the case where not adding measured material, calibration process is as follows：
1. transmitting terminal launches vertical polarization signal, the horizontal useful signal A of receiving terminalH cos(ωt+φH) it is 0, substitute into formula
(1) the horizontal signal v that now receiver is received, is obtainedH1As vertically to level leakage：
vH1=αV→Hcos(ωt+φV→H) (2)
2. the signal that transmitting terminal emission level polarizes, the vertical useful signal A of receiving terminalVcos(ωt+φV) it is 0, substitute into
Formula (1), obtains the vertical signal v that now receiver is receivedV2As level is revealed to vertical：
vV2=αH→Vcos(ωt+φV→H) (3)
3. transmitting terminal launches the signal of 45 ° of polarization, i.e., should have
AH cos(ωt+φH)=AVcos(ωt+φV) (4)
It is assumed that the signal respectively v that now receiver is receivedV3、vH3, then have
Simultaneous (2), (3), (4), (5) formula solve the unknown parameter in (1) formula；
After calibration, when measuring detected materials, the A after wait the amount of measuring and monitoring the growth of standing timber is calculated according to the parameter after calibrationV、
AH、φV、φH, so as to calculate polarization characteristic of the material for measured THz wave.
The present invention can improve measurement accuracy to 30dB~40dB, and transmitting terminal uses linear polarization Gaussian beam, and receives
End then uses above-mentioned quadrature receiving.
Claims (6)
1. a kind of be used to measure method of the material in terahertz wave band polarization characteristic, it is characterised in that step is as follows：Using orthogonal
The mode of sampling is acquired to the orthogonal signalling received, while using calibration algorithm by the cross-pole of ortho mode transducer
Change, the amplitude-phase of quadrature receiving two paths of signals is inconsistent is calibrated；After calibration, when measuring detected materials, according to
Parameter after calibration calculates the amplitude after wait the amount of measuring and monitoring the growth of standing timber and phase, so as to draw detected materials for measured terahertz
The hereby polarization characteristic of ripple；
The calibration algorithm is specific as follows：
Transmitting terminal uses the Gaussian beam of linear polarization, and in the case where not adding measured material, calibration process is as follows：
1. transmitting terminal launches vertical polarization signal, the horizontal useful signal A of receiving terminalH cos(ωt+φH) it is 0, formula (1) is substituted into,
Obtain the horizontal signal v that now receiver is receivedH1As vertically to level leakage：
vH1=αV→Hcos(ωt+φV→H) (2)
2. the signal that transmitting terminal emission level polarizes, the vertical useful signal A of receiving terminalVcos(ωt+φV) it is 0, substitute into
Formula (1), obtains the vertical signal v that now receiver is receivedV2As level is revealed to vertical：
vV2=αH→Vcos(ωt+φV→H) (3)
3. transmitting terminal launches the signal of 45 ° of polarization, i.e., should have
AH cos(ωt+φH)=AVcos(ωt+φV) (4)
It is assumed that the signal respectively v that now receiver is receivedV3、vH3, then have
Simultaneous (2), (3), (4), (5) formula solve the unknown parameter in (1) formula；
After calibration, when measuring detected materials, the A after wait the amount of measuring and monitoring the growth of standing timber is calculated according to the parameter after calibrationV、AH、
φV、φH, so as to calculate polarization characteristic of the material for measured THz wave.
2. according to claim 1 a kind of for measuring method of the material in terahertz wave band polarization characteristic, its feature exists
In：It is v that the signal collected, which includes the vertical polarization passage i.e. signal of V channel receptions,V, horizontal polarization passage is H channel receptions
Signal be vH, vVAnd vHExpression formula for shown in formula (1)：
A in formulav、AHExpression amplitude, φv、φHRepresent phase, αVHRepresent amplitude difference, φ caused by V passages, H channel imbalancesVH
Represent the difference of V, H passage, αH→VRepresent that H passages are leaked to the signal intensity of V passages, αV→HRepresent that V passages are leaked to H passages
Signal intensity, φV→HRepresent V passages and the phase of H passage leakage signals.
3. a kind of suitable for claim 1 methods described is used to measure system of the material in terahertz wave band polarization characteristic, its
It is characterised by：Overall to be made up of transmitting terminal and receiving terminal, receiving terminal includes orthogonal signalling receiving unit, V signal detection unit, H
Detecting signal unit, local oscillator frequency multiplier chain and signal processing unit, orthogonal signalling receiving unit will be believed using ortho mode transducer
Number it is divided into V signal and H signal, then V signal, H signal is detected using superhet form, the output end of local oscillator frequency multiplier chain
It is respectively connecting to V signal detection unit and H signal detection unit, the output end of V signal detection unit and H signal detection unit
Output end is connected to signal processing unit.
4. according to claim 3 a kind of for measuring system of the material in terahertz wave band polarization characteristic, its feature exists
In：The local oscillator frequency multiplier chain includes local vibration source, several frequency multipliers and power splitter, and several frequency multipliers are sequentially connected in series, local vibration source
Output end be connected to series connection frequency multiplier input, the output end of the input of the frequency multiplier of series connection is connected to power splitter,
The output end of power splitter is respectively connecting to V signal detection unit and H signal detection unit.
5. according to claim 4 a kind of for measuring system of the material in terahertz wave band polarization characteristic, its feature exists
In：The V signal detection unit includes harmonic mixer one, low noise amplification module one, wave filter one and attenuator one, harmonic mixing
The output end of device one is connected to low noise amplification module one, and the output end of low noise amplification module one is connected to wave filter one, wave filter one
Output end is connected to attenuator one, and the output end of attenuator one is connected to signal processing unit；The ortho mode transducer
Output end and the output end of power splitter are connected to the harmonic mixer one of V signal detection unit.
6. according to claim 4 a kind of for measuring system of the material in terahertz wave band polarization characteristic, its feature exists
In：The H signal detection unit includes harmonic mixer two, low noise amplification module two, wave filter two and attenuator two, harmonic mixing
The output end of device two is connected to low noise amplification module two, and the output end of low noise amplification module two is connected to wave filter two, wave filter two
Output end is connected to attenuator two, and the output end of attenuator two is connected to signal processing unit；The ortho mode transducer
Output end and the output end of power splitter are connected to the harmonic mixer two of H signal detection unit.
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| CN106199188B (en) * | 2016-07-20 | 2019-01-18 | 中国科学院紫金山天文台 | A kind of device and method using removal cable phase change in circulator calibration vector field measurement |
| CN109282896B (en) * | 2017-07-23 | 2020-08-18 | 北京遥感设备研究所 | Heterodyne reception-based terahertz power measurement system |
| CN109799445B (en) * | 2017-11-17 | 2024-03-19 | 核工业西南物理研究院 | Millimeter wave band microwave polarization parameter measurement system |
| CN114123979B (en) * | 2022-01-25 | 2022-05-03 | 电子科技大学 | Terahertz full-duplex common local oscillator solid-state front-end transmitting circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2845199Y (en) * | 2005-11-21 | 2006-12-06 | 中山市通宇通讯设备有限公司 | Planar di-polar intellectual antenna array |
| CN102983411A (en) * | 2010-07-01 | 2013-03-20 | 中国电子科技集团公司第五十四研究所 | Polarization calibration method for antenna system with automatic polarization adjustment function |
| CN103067096A (en) * | 2012-10-05 | 2013-04-24 | 中国电子科技集团公司第十研究所 | Calibration method of accurately testing polarization component of two perpendicular lines of antenna |
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| US20140150523A1 (en) * | 2012-12-04 | 2014-06-05 | Halliburton Energy Services, Inc. | Calibration of a well acoustic sensing system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2845199Y (en) * | 2005-11-21 | 2006-12-06 | 中山市通宇通讯设备有限公司 | Planar di-polar intellectual antenna array |
| CN102983411A (en) * | 2010-07-01 | 2013-03-20 | 中国电子科技集团公司第五十四研究所 | Polarization calibration method for antenna system with automatic polarization adjustment function |
| CN103067096A (en) * | 2012-10-05 | 2013-04-24 | 中国电子科技集团公司第十研究所 | Calibration method of accurately testing polarization component of two perpendicular lines of antenna |
Non-Patent Citations (1)
| Title |
|---|
| 《外场雷达目标ＲＣＳ极化特性测量方法》;张德保等;《舰船电子对抗》;20111231;第34卷(第6期);正文第58-59页 * |
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