CN103532492A - Broadband amplitude modulation millimeter wave reflection system based on waveguide modulation technology - Google Patents
Broadband amplitude modulation millimeter wave reflection system based on waveguide modulation technology Download PDFInfo
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Abstract
The invention belongs to the technical field of nuclear fusion plasma microwave diagnosis and in particular relates to a broadband low-loss high-frequency microwave modulator based on a rectangular waveguide and a broadband amplitude modulation millimeter wave reflection system based on the waveguide modulator. A quartz crystal oscillator B is connected with a power amplifier; the power amplifier is connected with an intermediate frequency input end of the waveguide modulator; a microwave source is connected with a microwave input end of the waveguide modulator; the waveguide modulator is connected with a microwave amplifier; the microwave amplifier is connected with a horn antenna; a microwave detector is connected with a frequency-selecting amplifier; the frequency-selecting amplifier is connected with a down converter A; the quartz crystal oscillator B is also connected with a down converter B; a quartz crystal oscillator A is respectively connected with the down converter A and the down converter B; the down converter A is connected with a band-pass filter A; the band-pass filter A is connected with a phase discriminator; the down converter B is connected with a band-pass filter B; the band-pass filter B is connected with the phase discriminator. According to the system, low-loss ultrahigh-frequency microwave amplitude modulation can be realized.
Description
Technical field
The invention belongs to nuclear fusion plasma microwave diagnostic techniques field, be specifically related to a kind of broadband, low-loss, high-frequency microwave modulator and broadband amplitude modulation millimeter wave reflecting system based on this waveguide modulator based on rectangular waveguide.
Background technology
Plasma electron density and temperature are controlled nuclear fusion experimental study applying plasma hydromagnetic instabilities, and Electron Heat transports, PARTICLE TRANSPORT FROM, and turbulent flow, high restriction mode operation and plasma profile are controlled one of physical parameter with the most critical moving.Electron density and electron temperature that microwave diagnostics can be goed deep into plasma internal measurement high time-space resolution distribute and disturbance, and it is one of current in the world advanced diagnostic techniques that main several fusion facility is first developed.For realizing plasma internal electron density and temperature distributing measuring, need high frequency ultra-wideband microwave frequency modulation(FM) device.
Microwave current diagnostic measurement plasma electron density distributes and mainly contains two kinds of modulation systems of Frequency And Amplitude Modulation.The modulating frequency of microwave reflection diagnosis is determined by the factors such as turbulent flow of fusionplasma plant bulk and plasma.For HL-2A tokamak, the modulating frequency of amplitude modulation microwave reflection diagnosis must be chosen to be at 200MHz-300MHz left and right.The modulating frequency of domestic and international most broadband millimeter-wave Microwave Frequency Sources under Frequency And Amplitude Modulation mode of operation is approximately 1MHz left and right at present, can reach the microwave source of 10MHz individually, increase along with frequency, modulation degree is more and more less, so these millimeter wave frequency sources can not be used directly in amplitude modulation or fm microwave reflection measurement on controlled fusion device.
Summary of the invention
The object of the invention is to the restriction lower for Millimeter-Wave Source modulating frequency, bandwidth is narrower, a kind of broadband, low-loss, high-frequency microwave modulator and broadband amplitude modulation millimeter wave reflecting system based on this waveguide modulator based on rectangular waveguide is provided, in Millimeter Wave Rectangular Wave-guide, realize high-frequency wideband microwave frequency and amplitude modulation(PAM), and apply it in Microwave reflection measurement system.
For achieving the above object, the technical solution used in the present invention is:
, its E face that adopts the microwave mixer diode array of same model to be placed side by side waveguide forms.
The quantity of described microwave mixer diode is three.
A broadband amplitude modulation millimeter wave reflecting system for waveguide modulation technique, this system comprises microwave source, waveguide modulator, microwave amplifier, microwave detector, frequency selective amplifier, low-converter A, band pass filter A, phase discriminator, quartz oscillator A, quartz oscillator B, power amplifier, horn antenna, low-converter B, band pass filter B; The output of described quartz oscillator B is connected with the input of power amplifier, the output of power amplifier is connected with the middle frequency input terminal of waveguide modulator, microwave source is connected with the microwave input of waveguide modulator, the output of waveguide modulator is connected with the input of microwave amplifier, and the output of microwave amplifier is connected with horn antenna; The output of microwave detector is connected with the input of frequency selective amplifier, the output of frequency selective amplifier is connected with low-converter A, the output of quartz oscillator B is also connected with low-converter B, quartz oscillator A is connected with low-converter B with low-converter A respectively, low-converter A is connected with the input of band pass filter A, the output of band pass filter A is connected with phase discriminator, and low-converter B is connected with the input of band pass filter B, and the output of band pass filter B is connected with phase discriminator.
This system also comprises vision signal detector, and the output of described band pass filter A is also connected with vision signal detector.
The power of described microwave source is between 50 ~ 100mW, and frequency range is 26GHz ~ 40GHz or 40GHz ~ 60GHz.
The reference frequency output of described quartz oscillator B is 200MHz ~ 300MHz.
The output frequency of described quartz oscillator A is than the little 2MHz ~ 5MHz of the output frequency of quartz oscillator B.
Described quartz oscillator B, quartz oscillator A all adopt low-noise constant-temperature crystal oscillator.
The operating frequency range of described waveguide modulator is 26GHz ~ 40GHz or 40GHz ~ 60GHz.
The modulation degree of described waveguide modulator is between 10% ~ 40%.
The obtained beneficial effect of the present invention is:
Waveguide modulator of the present invention adopts the microwave mixer diode array of same model to be placed side by side the E face of waveguide, can realize low-loss, hyperfrequency microwave amplitude or frequency modulation(FM); Have that cost is low, modulation degree advantages of higher, the Microwave reflection measurement except distributing for plasma electron density, can also need for other microwave modulating system of broadband, high frequency;
Broadband amplitude modulation millimeter wave reflecting system based on this waveguide modulator of the present invention, by millimeter wave is carried out to high frequency frequency and amplitude modulation(PAM), realize amplitude modulation or fm microwave reflection measurement, by broadband demodulation and tuning frequency-selecting, amplify, intermediate-freuqncy signal while proposing modulation, compare and measure intermediate-freuqncy signal and can obtain the time of microwave transmission with reference to the phase difference of intermediate-freuqncy signal, and then can be finally inversed by the position of reflecting surface and the shock wave of reflecting surface.
Accompanying drawing explanation
Fig. 1 is broadband, low-loss, the high-frequency microwave modulator schematic diagram based on rectangular waveguide of the present invention;
Fig. 2 is the broadband amplitude modulation millimeter wave reflecting system structure chart based on waveguide modulation technique of the present invention;
In figure: 1, microwave source; 2, waveguide modulator; 3, microwave amplifier; 4, microwave detector; 5, frequency selective amplifier; 6, low-converter A; 7, band pass filter A; 8, vision signal detector; 9, phase discriminator; 10, quartz oscillator A; 11, quartz oscillator B; 12, power amplifier; 13, plasma; 14, horn antenna; 15, low-converter B; 16, band pass filter B.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail, with the amplitude modulation microwave reflection in HL-2A tokamak, is diagnosed as example.
As shown in Figure 1, waveguide modulator of the present invention adopts the microwave mixer diode array (as three) of same model to be placed side by side the E face of waveguide, realizes low-loss, hyperfrequency microwave amplitude or frequency modulation(FM).
As shown in Figure 2, the broadband amplitude modulation millimeter wave reflecting system based on this waveguide modulator of the present invention comprises microwave source 1, waveguide modulator 2, microwave amplifier 3, microwave detector 4, frequency selective amplifier 5, low-converter A6, band pass filter A7, vision signal detector 8, phase discriminator 9, quartz oscillator A10, quartz oscillator B11, power amplifier 12, horn antenna 14, low-converter B15, band pass filter B16, the output of described quartz oscillator B11 is connected with the input of power amplifier 12, the output of power amplifier 12 is connected with the middle frequency input terminal of waveguide modulator 2, microwave source 1 is connected with the microwave input of waveguide modulator 2, the output of waveguide modulator 2 is connected with the input of microwave amplifier 3, and the output of microwave amplifier 3 is connected with horn antenna 14, the output of microwave detector 4 is connected with the input of frequency selective amplifier 5, the output of frequency selective amplifier 5 is connected with low-converter A6, the output of quartz oscillator B11 is also connected with low-converter B15, quartz oscillator A10 is connected with low-converter B15 with low-converter A6 respectively, the output of low-converter A6 is connected with the input of band pass filter A7, the output of band pass filter A7 is connected with vision signal detector 8 with phase discriminator 9 respectively, the output of low-converter B15 is connected with the input of band pass filter B16, the output of band pass filter B16 is connected with phase discriminator 9,
The power of described microwave source 1 is between 50 ~ 100mW, and frequency range is 26GHz ~ 40GHz or 40GHz ~ 60GHz;
The operating frequency range of described waveguide modulator 2 is 26GHz ~ 40GHz or 40GHz ~ 60GHz, and it is mainly determined by operating frequency and the waveguide dimensions of microwave mixer diode; Insertion loss mainly determines by the quantity and the arrangement mode that are placed in the microwave mixer diode of waveguide, and minimum can be controlled in 7dB left and right; Modulation degree is between 10% ~ 40%; Power and the frequency of the intermediate-freuqncy signal that the modulation degree of microwave is mainly produced by quartz oscillator B11 determine, when the frequency of intermediate-freuqncy signal is 250MHz left and right, when power output is 1W, the amplitude modulation(PAM) degree of microwave can reach more than 30%.
The reference frequency output of described quartz oscillator B11 is 200MHz ~ 300MHz;
The output frequency of described quartz oscillator A10 is than the little 2MHz ~ 5MHz of the output frequency of quartz oscillator B11;
Described quartz oscillator B11, quartz oscillator A10 all adopt low-noise constant-temperature crystal oscillator, to improve signal to noise ratio;
During work, quartz oscillator B11 produces intermediate-freuqncy signal, wherein power amplification is carried out through power amplifier 12 in a road, the output signal of power amplifier 12 drives waveguide modulator 2, the microwave signal that microwave source 1 is sent is carried out amplitude modulation(PAM), and the microwave signal after modulation is launched by horn antenna 14 after microwave amplifier 3 amplifies, 4 pairs of microwaves that reflect from plasma 13 of microwave detector carry out detection, by frequency selective amplifier 5, measure amplitude modulation envelope ripple again, low-converter A6 carries out mixing to the signal of the output signal of frequency selective amplifier 5 and quartz oscillator A10 generation, the signal that another road intermediate-freuqncy signal that low-converter B15 produces quartz oscillator B11 and quartz oscillator A10 produce carries out mixing, two-way mixed frequency signal is respectively through band pass filter A7, band pass filter B16 carries out filtering, filtered two-way low frequency signal is inputted respectively phase discriminator 9, in phase discriminator 9, compare the phase place of the intermediate-freuqncy signal after difference frequency, obtain the propagation phase of microwave in plasma poor, it is the time delay that microwave is propagated in plasma, finally by system calibrating, analog computation and Abel's inverting, obtain required electron density distribution and disturbance, at measurement passage, can also draw range signal A, by vision signal detector 8, carry out detection, strong and weak to measure reflection disturbing signal.
Claims (10)
1. a waveguide modulator, is characterized in that: its E face that adopts the microwave mixer diode array of same model to be placed side by side waveguide forms.
2. waveguide modulator according to claim 1, is characterized in that: the quantity of described microwave mixer diode is three.
3. the broadband amplitude modulation millimeter wave reflecting system based on waveguide modulation technique, is characterized in that: this system comprises microwave source (1), waveguide modulator (2), microwave amplifier (3), microwave detector (4), frequency selective amplifier (5), low-converter A(6), band pass filter A(7), phase discriminator (9), quartz oscillator A(10), quartz oscillator B(11), power amplifier (12), horn antenna (14), low-converter B(15), band pass filter B(16), described quartz oscillator B(11) output is connected with the input of power amplifier (12), the output of power amplifier (12) is connected with the middle frequency input terminal of waveguide modulator (2), microwave source (1) is connected with the microwave input of waveguide modulator (2), the output of waveguide modulator (2) is connected with the input of microwave amplifier (3), and the output of microwave amplifier (3) is connected with horn antenna (14), the output of microwave detector (4) is connected with the input of frequency selective amplifier (5), the output of frequency selective amplifier (5) and low-converter A(6) be connected, quartz oscillator B(11) output also with low-converter B(15) be connected, quartz oscillator A(10) respectively with low-converter A(6) with low-converter B(15) be connected, low-converter A(6) with band pass filter A(7) input be connected, band pass filter A(7) output is connected with phase discriminator (9), low-converter B(15) with band pass filter B(16) input be connected, band pass filter B(16) output is connected with phase discriminator (9).
4. the broadband amplitude modulation millimeter wave reflecting system based on waveguide modulation technique according to claim 3, is characterized in that: this system also comprises vision signal detector (8) described band pass filter A(7) output be also connected with vision signal detector (8).
5. the broadband amplitude modulation millimeter wave reflecting system based on waveguide modulation technique according to claim 3, is characterized in that: the power of described microwave source (1) is between 50 ~ 100mW, and frequency range is 26GHz ~ 40GHz or 40GHz ~ 60GHz.
6. the broadband amplitude modulation millimeter wave reflecting system based on waveguide modulation technique according to claim 3, is characterized in that: reference frequency output described quartz oscillator B(11) is 200MHz ~ 300MHz.
7. the broadband amplitude modulation millimeter wave reflecting system based on waveguide modulation technique according to claim 3, is characterized in that: output frequency described quartz oscillator A(10) is than quartz oscillator B(11) the little 2MHz ~ 5MHz of output frequency.
8. the broadband amplitude modulation millimeter wave reflecting system based on waveguide modulation technique according to claim 3, is characterized in that: described quartz oscillator B(11), quartz oscillator A(10) all adopt low-noise constant-temperature crystal oscillator.
9. the broadband amplitude modulation millimeter wave reflecting system based on waveguide modulation technique according to claim 3, is characterized in that: the operating frequency range of described waveguide modulator (2) is 26GHz ~ 40GHz or 40GHz ~ 60GHz.
10. the broadband amplitude modulation millimeter wave reflecting system based on waveguide modulation technique according to claim 3, is characterized in that: the modulation degree of described waveguide modulator (2) is between 10% ~ 40%.
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Cited By (6)
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| CN105101599A (en) * | 2014-05-04 | 2015-11-25 | 核工业西南物理研究院 | Polarized electron cyclotron emission (ECE) diagnosis system for measuring plasma current distribution |
| CN106053357A (en) * | 2016-07-12 | 2016-10-26 | 中国石油化工股份有限公司 | Plasma in-situ characterization method |
| CN109975856A (en) * | 2017-12-27 | 2019-07-05 | 核工业西南物理研究院 | A kind of multi-beam microwave source based on multiplexer |
| CN111650556A (en) * | 2020-06-15 | 2020-09-11 | 中国人民解放军国防科技大学 | Broadband radiation source parameter estimation method |
| CN113126036A (en) * | 2021-04-20 | 2021-07-16 | 核工业西南物理研究院 | Fast scanning microwave detector and detection method |
| CN113138369A (en) * | 2021-03-29 | 2021-07-20 | 核工业西南物理研究院 | Microwave detector based on spread spectrum modulation |
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Cited By (11)
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|---|---|---|---|---|
| CN105101599A (en) * | 2014-05-04 | 2015-11-25 | 核工业西南物理研究院 | Polarized electron cyclotron emission (ECE) diagnosis system for measuring plasma current distribution |
| CN105101599B (en) * | 2014-05-04 | 2017-11-24 | 核工业西南物理研究院 | A kind of polarization ECE diagnostic systems for measuring plasma current distribution |
| CN106053357A (en) * | 2016-07-12 | 2016-10-26 | 中国石油化工股份有限公司 | Plasma in-situ characterization method |
| CN109975856A (en) * | 2017-12-27 | 2019-07-05 | 核工业西南物理研究院 | A kind of multi-beam microwave source based on multiplexer |
| CN109975856B (en) * | 2017-12-27 | 2024-02-09 | 核工业西南物理研究院 | Multi-beam microwave source based on multiplexer |
| CN111650556A (en) * | 2020-06-15 | 2020-09-11 | 中国人民解放军国防科技大学 | Broadband radiation source parameter estimation method |
| CN111650556B (en) * | 2020-06-15 | 2023-09-01 | 中国人民解放军国防科技大学 | Broadband radiation source parameter estimation method |
| CN113138369A (en) * | 2021-03-29 | 2021-07-20 | 核工业西南物理研究院 | Microwave detector based on spread spectrum modulation |
| CN113138369B (en) * | 2021-03-29 | 2023-08-15 | 核工业西南物理研究院 | Microwave detector based on spread spectrum modulation |
| CN113126036A (en) * | 2021-04-20 | 2021-07-16 | 核工业西南物理研究院 | Fast scanning microwave detector and detection method |
| CN113126036B (en) * | 2021-04-20 | 2023-04-11 | 核工业西南物理研究院 | Fast scanning microwave detector and detection method |
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Application publication date: 20140122 |