CN102186303A - Microwave power confocal synthesis device - Google Patents
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- CN102186303A CN102186303A CN 201110110259 CN201110110259A CN102186303A CN 102186303 A CN102186303 A CN 102186303A CN 201110110259 CN201110110259 CN 201110110259 CN 201110110259 A CN201110110259 A CN 201110110259A CN 102186303 A CN102186303 A CN 102186303A
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Abstract
The invention relates to a microwave power confocal synthesis device. Aiming at the shortages that the microwave power synthesizer in the prior art has relatively high requirements on microwave sources, the system structure is complicated and the cost is high, the invention discloses a microwave power confocal synthesis device. The microwave power confocal synthesis device synthesizes the power of multiple paths of microwaves to obtain a large-power microwave, so that the cost of large-power microwave equipment is reduced. The technical scheme of the invention is that: the microwave power confocal synthesis device comprises at least two microwave input ends and the corresponding waveguide cavities. The waveguide cavity comprises a bottom surface, a top surface and a side wall vertical to the bottom surface and the top surface, wherein the bottom surface and the top surface are parallel to each other; the orthographic projection of the side wall on the bottom surface or the top surface is an elliptical arc; the microwave input end is arranged on a focus of the elliptical arc; the other focus of the elliptical arc is superposed and is a microwave gathering end; and the microwaves inputted by the microwave input ends are gathered at the microwave gathering end after passing through the waveguide cavities. The microwave power confocal synthesis device can be used for generating plasmas.
Description
Technical field
The present invention relates to the crossing domain of microwave technology and plasma technology, particularly a kind of confocal synthesizer of microwave power that can be used for the activated plasma fireball.
Background technology
Plasma fireball is a kind of common natural phenomena, often shows as ball lightning that people know, flash of light preceding an earthquake fireball etc.For reason and natural characteristic and the rule of understanding fully that this phenomenon produces, people are from beginning just to have launched relevant research work very early.The record of atmosphere fireball phenomenon and research and inquirement are in the ancient book of China, as all on the books in the successive dynasties history records such as the Classic of Mountains and Rivers, " Records of the Historian ".In other words, from the ancient history record of China, the research history of atmosphere fireball has 2000 at least.Even count, also there be more than 170 year so far from the paper that F.Arago delivered first in 1838.To the mid-80, about 2000 examples of publishing of fireball observations of arrangement by analysis, paper has a hundreds of piece of writing, 2 of monographs.The research of later stage eighties ball lightning had rapidly development, and it is to be sign with the first ball lightning academic discussion of holding in the Waseda University, Tokyo in July, 1988.26 scientists from 8 countries in the meeting have delivered 20 pieces of papers, an adopted professor man of virtue and ability of big rule of Waseda University has announced the analysis result and the fireball picture recording of Japan's 2000 routine atmosphere fireballs, the G. Ai Geli of the Hungary academy of sciences has announced the analysis result of 300 many cases cases, the A. Cole of Austria Sai Sibao university has announced 150 routine Austrian fireball data, and A.I. doctor Ge Ligeyefu of Soviet Union Ya Nuosilafu university has announced the character of the about 3000 leading case examples of the Soviet Union: the shape of fireball has spherical, the ellipsoid shape, the pears shape, the spindle shape, ring-type, banded, plate-like, column and irregular etc.; The color adularescent of fireball, rose-colored, red, orange, yellow, green, pale blue is green, blue, purple and secondary colour.The sum of data adds the data of having announced already on the document, has reached more than 6000 examples.This is enough to show that people have keen interest to this natural phenomena.Certainly, this interest is not only because people to the incomplete understanding of this natural phenomena, come from its wide actual application prospect especially.The for example application aspect the energy because the sun is exactly a huge plasma fireball, has almost nexhaustible energy, and people want to imitate the mechanism of the sun all the time, and controlled sun of artificial manufacturing provides the energy; Also for example military plasma advances, the plasma stealth; Critical processes such as plasma etching, ashing and thin film deposition during circuit is made; Plasma cutting and welding in the commercial Application; Plasma melting in the metallurgical industry, refined metals; Plasma spray coating in the mechanical industry; In the powder industry, plasma can be used for nodularization and densification powder particle, the flowability of powder stock is improved, density improves, and purity increases, and plasma also can be used to be used for sintered powder goods, particularly some most advanced and sophisticated ceramic material goods.Along with the problem of environmental protection is urgent day by day; hot plasma is also exhibited one's skill to the full in the field of waste disposal; USN is investing a kind of small-sized carrier-borne hot plasma domestic garbage disposer of development in recent years always, in order to avoid to ocean dumping seaman's the marine pollution that house refuse caused.In addition, it is used and also comprises light source (as efficient arc lamp) and demonstration (as neon light, plasma display panel (PDP) curtain) etc.
Microwave has obtained in the laboratory using widely as the effective way that produces plasma.And this class device all is to utilize waveguide to be used as producing the cavity of plasma ball, utilizes microwave to provide energy to keep plasma ball.The plasma spheroid can move in waveguide, and this motion for the research plasma fireball provides advantageous conditions.But it is fewer that this class device is used in other industry, and main cause is to produce relatively difficulty of HIGH-POWERED MICROWAVES at present.Improve microwave power and have only two approach, first is to use high-power microwave source, and the secondth, adopt the synthetic way of microwave power.The price of high-power microwave source is more many than costing an arm and a leg of common microwave source, uses high-power microwave source to be increased sharply and produces and use cost.Because the particularity of microwave transmission, synthetic for microwave power, from the microwave theory of classics as can be known, it is synthetic to have only relevant microwave source just can carry out power, be that the condition that each microwave source that need synthesize meets with the frequency homophase just can reach maximum combined coefficient, this needs frequency stabilization phase modulation microwave source.Yet the price of frequency stabilization phase modulation microwave source is higher than common microwave source far away, adopts a plurality of frequency stabilization phase modulation microwave sources, will increase equipment cost greatly.
Summary of the invention
Technical problem to be solved by this invention, be exactly at the prior art microwave power synthesizer, microwave source is had relatively high expectations, the system configuration complexity, the shortcoming that cost is high provides a kind of microwave power confocal synthesizer, multichannel microwave is carried out power synthesize, thereby the acquisition HIGH-POWERED MICROWAVES, the cost of reduction HIGH-POWERED MICROWAVES equipment.
The present invention solve the technical problem, the technical scheme that adopts is, the confocal synthesizer of microwave power, comprise at least 2 microwave inputs and corresponding waveguide cavity thereof, it is characterized in that, described waveguide cavity comprise parallel bottom surface and end face and with the described bottom surface sidewall vertical with end face, described sidewall is an elliptic arc in the orthographic projection of described bottom surface or end face; Described microwave input places on the focus of described elliptic arc, and another focus of described elliptic arc overlaps, and is the microwave pool side; The microwave of described microwave input input converges in described microwave pool side through after the described waveguide cavity.
The confocal synthesizer of microwave power of the present invention, the characteristic that converges with ellipse is used for waveguiding structure microwave is converged cleverly, and the waveguide of this structure can be called waveguide cavity or elliptical wave guide cavity, and the focus of its sidewall elliptic arc also is the focus of waveguide cavity.This elliptical wave guide cavity, on the cross section vertical with two focus lines, it is shaped as rectangle, so this waveguide cavity also can be regarded as the rectangular waveguide of changes of section.Several this waveguide cavity are docked in the present invention, constitute a confocal cavity, can with 2 the road and above microwave be gathered together, form the scalar stack of microwave power, thereby obtain HIGH-POWERED MICROWAVES.Waveguide cavity of the present invention can adopt traditional metal material to constitute, and also can adopt the nonmetallic materials cavity, applies layer of conductive material at cavity inner surface and constitutes.
Preferably, the microwave of described microwave input input is incoherent microwave.Because microwave produces in the process of plasma, plasma is just utilizing microwave energy, and its process is actual to be the energy that microwave energy is converted to plasma.And as a kind of application conversion of energy in other words of energy, be with the frequency of microwave itself and phase-independent, adopt incoherent microwave source, can reduce installation cost, be particularly suitable for transmitting plasma.
Further, described microwave input is connected with microwave source by isolator or circulator.At the microwave input isolator or circulator are set, can stop the microwave that reflects from waveguide cavity to enter microwave source and cause damage.
Recommend, described microwave pool side is equipped with electric discharge device, by the point discharge activated plasma.Utilizing the point discharge technology to produce plasma is that typical case of the present invention uses, and is particularly suitable for carrying out power with incoherent microwave source and synthesizes, and produces plasma.
Preferably, described microwave input is an odd number, and its corresponding odd number waveguide cavity has same structure.Adopt the waveguide cavity of same structure, can reduce production costs.Select the structure of odd number waveguide cavity, can avoid two microwave inputs in confocal cavity, to be in a straight line, influence the work of microwave power source.
Further, described waveguide cavity evenly distributes in the space.Waveguide cavity the even distribution in space can make between the microwave input space length farthest, help reducing the phase mutual interference.
Especially, described microwave input is 3, and described 3 microwave inputs are positioned at 3 summits of equilateral triangle.This scheme can be gathered together the microwave of 3 microwave sources, and since 3 microwave input space lengths farthest, its phase mutual interference can be accomplished minimum.
The invention has the beneficial effects as follows, can carry out multi-channel microwave power and synthesize, significantly improve microwave power.And can not require that each microwave power source must be relevant microwave power source, and do not need each microwave power source is carried out frequency stabilization and phase modulation, reduced cost greatly.The present invention can adopt low-cost incoherent microwave power source to carry out the synthetic and generation plasma of incoherent microwave power, carries out plasma research and application.
Description of drawings
Fig. 1 is the structural representation of embodiment 1;
Fig. 2 is the structural representation of embodiment 2;
Fig. 3 is the structural representation of embodiment 3;
Fig. 4 is the structural representation of embodiment 4.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail.
The confocal synthesizer of microwave power of invention comprises at least 2 microwave inputs and corresponding waveguide cavity thereof, and wherein, each waveguide cavity constitutes by parallel bottom surface and end face and with the described bottom surface sidewall vertical with end face.Described sidewall is an elliptic arc in the orthographic projection of described bottom surface or end face, and the microwave input places on the focus of this elliptic arc, and another focus of described elliptic arc overlaps with a focus of other waveguide cavity, constitutes microwave of the present invention pool side.From the relevant or irrelevant microwave of each input input,, form the scalar stack of microwave power, thereby obtain HIGH-POWERED MICROWAVES through converging in the microwave pool side after its corresponding waveguide cavity transmission.The confocal synthesizer of microwave power of invention, confocal cavity of the common formation of each waveguide cavity.The focus that each waveguide cavity overlaps is exactly the public focus of this confocal cavity, also is microwave of the present invention pool side, and another focus of each waveguide cavity is the microwave input.These microwave inputs are connected with microwave source by circulator or isolator, and microwave is introduced waveguide cavity, converge in confocal cavity.
Referring to Fig. 1, wherein a is a front view, and b is a left view, and c is a vertical view.The confocal synthesizer of this routine microwave power comprises microwave input A and microwave input B, and the waveguide cavity of their correspondence is respectively waveguide cavity 1 and waveguide cavity 2, and waveguide cavity 1 and waveguide cavity 2 butt joints constitute confocal cavity.The sidewall 10 of waveguide cavity 1 and waveguide cavity 2 is vertical with end face 12 with bottom surface 11 with sidewall 20, and the orthographic projection on bottom surface 11 and end face 12 of sidewall 10 and sidewall 20 is an elliptic arc, sees Fig. 1 a.Two focuses of waveguide cavity 1 are respectively A and O, and two focuses of waveguide cavity 2 are respectively B and O.Wherein focus O is the public focus of waveguide cavity 1 and waveguide cavity 2, i.e. this routine microwave pool side.Focus A is the microwave input of waveguide cavity 1, and focus B is the microwave input of waveguide cavity 2, and these two microwave inputs are placed in the end points of line segment AB, and the microwave of its input through converging in public focus O after waveguide cavity 1 and the waveguide cavity 2, forms the microwave power stack.In this example, because two microwave inputs and public focus are positioned on the straight line space length of two microwave inputs (otherwise will shorten), might constitute the microwave source that two microwave inputs connect and disturb even damage, so between two inputs and microwave source, be connected circulator or isolator is necessary.These routine characteristics are that the confocal cavity body structure is simple, are convenient to produce, and waveguide cavity 1 and waveguide cavity 2 have same structure, have further reduced production cost.
As shown in Figure 2, among the figure, a is a front view, and b is a left view, and c is a vertical view.The confocal synthesizer of this routine microwave power is a kind of 3 input microwave power synthesizers, constitute by 3 identical waveguide cavity of structure, these 3 waveguide cavity evenly distribute in the space, its microwave input is labeled as A, B and C respectively in Fig. 3 a, they lay respectively at a focus of waveguide cavity 1, waveguide cavity 2 and waveguide cavity 3, and these 3 microwave inputs are positioned at the summit of the equilateral triangle that ABC surrounds.Another focus of these 3 waveguide cavity coincides together, and is positioned at the center of equilateral triangle ABC, becomes this routine pool side, i.e. public focus O among Fig. 3 a.This confocal cavity that waveguide cavity 1, waveguide cavity 2 and waveguide cavity 3 constitute, three inputs at space length farthest, the phase mutual interference can drop to minimum.The confocal synthesizer of this routine microwave power can be with 3 road microwaves of microwave input A, B, C input, through converging to public focus O after the waveguide cavity transmission separately.At this routine microwave pool side O electric discharge device is installed, as spray point etc., can be by point discharge activated plasma fireball.This routine microwave input A, B, C are connected with microwave source by isolator or circulator, can stop the microwave that reflects from waveguide cavity to enter microwave source and cause damage, the microwave source here can be a vacuum device, as magnetron, travelling wave tube, klystron etc., the microwave that they produce does not need to carry out the adjustment or the control of frequency and phase place, adopts general incoherent microwave source to get final product.
As shown in Figure 3, among the figure, a is a front view, and b is a left view, and c is a vertical view.The confocal synthesizer of this routine microwave power is made of 4 identical waveguide cavity of structure, sees waveguide cavity 1, waveguide cavity 2, waveguide cavity 3 and waveguide cavity 4 among Fig. 3 a.The sidewall of these 4 waveguide cavity is vertical with the bottom surface with the waveguide cavity bottom surface, at the even elliptic arc of the orthographic projection of waveguide cavity bottom surface and bottom surface.A focus of 4 waveguide cavity overlaps, be this routine public focus O, another focus of 4 waveguide cavity is respectively A, B, C, D, they are positioned at the end points (straight line AB and straight line CD) of two vertical line, 4 microwave inputs of this example place respectively on these 4 focuses, and the intersection point of straight line AB and straight line CD is microwave pool side-for this routine public focus O.In the present embodiment, 4 waveguide cavity evenly distribute in the plane, can alleviate the mutual interference of 4 microwave input phases.
Embodiment 4
Fig. 4 shows the confocal synthesizer of microwave power that is made of 5 microwave inputs and 5 corresponding waveguide cavity thereof, and among the figure, a is a front view, and b is a left view, and c is a vertical view.5 waveguide cavity structures are identical, constitute by parallel bottom surface and end face and with the described bottom surface sidewall vertical with end face respectively, and sidewall is an elliptic arc in the orthographic projection of described bottom surface or end face, sees Fig. 4 a.Among Fig. 4 a, two focuses of each section elliptic arc, also be that the focus of the waveguide cavity of correspondence is labeled as respectively: two focuses of waveguide cavity 1 are labeled as A and O; Two focuses of waveguide cavity 2 are labeled as B and O; Two focuses of waveguide cavity 3 are labeled as C and O; Two focuses of waveguide cavity 4 are labeled as D and O; Two focuses of waveguide cavity 5 are labeled as E and O.Wherein, focus O is a public focus, is this routine microwave pool side.5 microwave inputs place respectively on the focus of its corresponding elliptic arc, i.e. A, B, C, D and E among Fig. 4 a, and the microwave of their input, the waveguide cavity transmission through corresponding converges in microwave pool side O.As seen from Figure 4,5 waveguide cavity of this example evenly distribute in the plane, butt joint constitutes confocal cavity mutually, because the microwave input is odd number (its corresponding waveguide cavity also is an odd number certainly), can avoid two microwave inputs in confocal cavity, to be in a straight line, disturb thereby reduce.
The above embodiment of the present invention only is used to illustrate technical scheme of the present invention, does not represent limitation of the invention.
Claims (7)
1. the confocal synthesizer of microwave power, comprise at least 2 microwave inputs and corresponding waveguide cavity thereof, it is characterized in that, described waveguide cavity comprise parallel bottom surface and end face and with the described bottom surface sidewall vertical with end face, described sidewall is an elliptic arc in the orthographic projection of described bottom surface or end face; Described microwave input places on the focus of described elliptic arc, and another focus of described elliptic arc overlaps, and is the microwave pool side; The microwave of described microwave input input converges in described microwave pool side through after the described waveguide cavity.
2. the confocal synthesizer of microwave power according to claim 1 is characterized in that, the microwave of described microwave input input is incoherent microwave.
3. the confocal synthesizer of microwave power according to claim 1 and 2 is characterized in that, described microwave input is connected with microwave source by isolator or circulator.
4. according to any confocal synthesizer of described microwave power of claim 1～3, it is characterized in that described microwave pool side is equipped with electric discharge device, by the point discharge activated plasma.
5. according to any confocal synthesizer of described microwave power of claim 1～4, it is characterized in that described microwave input is an odd number, its corresponding odd number waveguide cavity has same structure.
6. the confocal synthesizer of microwave power according to claim 5 is characterized in that described waveguide cavity evenly distributes in the space.
7. the confocal synthesizer of microwave power according to claim 6 is characterized in that described microwave input is 3, and described 3 microwave inputs are positioned at 3 summits of equilateral triangle.
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| CN 201110110259 CN102186303B (en) | 2011-04-29 | 2011-04-29 | Microwave power confocal synthesis device |
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| CN 201110110259 CN102186303B (en) | 2011-04-29 | 2011-04-29 | Microwave power confocal synthesis device |
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| CN102186303B CN102186303B (en) | 2013-01-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112074071A (en) * | 2020-10-05 | 2020-12-11 | 四川大学 | High-power plasma generating device of multichannel microwave source |
| CN112383997A (en) * | 2020-10-05 | 2021-02-19 | 四川大学 | High-power microwave plasma pulverized coal cracking device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3873935A (en) * | 1974-05-13 | 1975-03-25 | Hughes Aircraft Co | Microwave power accumulation structures comprising a plurality of stacked elliptical cavities |
| JPH03148591A (en) * | 1989-11-06 | 1991-06-25 | Mitsubishi Electric Corp | Double elliptical microwave discharge image heater |
| US20050034670A1 (en) * | 2003-08-13 | 2005-02-17 | Wen-Liang Huang | Multiple elliptical ball plasma apparatus |
| CN101814417A (en) * | 2009-02-25 | 2010-08-25 | 精工爱普生株式会社 | Light supply apparatus and projecting apparatus |
| CN201681794U (en) * | 2009-12-08 | 2010-12-22 | 上海明凯照明有限公司 | Microwave cavity and double-waveguide microwave plasma lamp |
-
2011
- 2011-04-29 CN CN 201110110259 patent/CN102186303B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3873935A (en) * | 1974-05-13 | 1975-03-25 | Hughes Aircraft Co | Microwave power accumulation structures comprising a plurality of stacked elliptical cavities |
| JPH03148591A (en) * | 1989-11-06 | 1991-06-25 | Mitsubishi Electric Corp | Double elliptical microwave discharge image heater |
| US20050034670A1 (en) * | 2003-08-13 | 2005-02-17 | Wen-Liang Huang | Multiple elliptical ball plasma apparatus |
| CN101814417A (en) * | 2009-02-25 | 2010-08-25 | 精工爱普生株式会社 | Light supply apparatus and projecting apparatus |
| CN201681794U (en) * | 2009-12-08 | 2010-12-22 | 上海明凯照明有限公司 | Microwave cavity and double-waveguide microwave plasma lamp |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112074071A (en) * | 2020-10-05 | 2020-12-11 | 四川大学 | High-power plasma generating device of multichannel microwave source |
| CN112383997A (en) * | 2020-10-05 | 2021-02-19 | 四川大学 | High-power microwave plasma pulverized coal cracking device |
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| CN102186303B (en) | 2013-01-23 |
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