EP1206901A1 - Applicateur de micro-ondes focalisant - Google Patents
Applicateur de micro-ondes focalisantInfo
- Publication number
- EP1206901A1 EP1206901A1 EP01958150A EP01958150A EP1206901A1 EP 1206901 A1 EP1206901 A1 EP 1206901A1 EP 01958150 A EP01958150 A EP 01958150A EP 01958150 A EP01958150 A EP 01958150A EP 1206901 A1 EP1206901 A1 EP 1206901A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- facet
- envelope
- microwave
- microwaves
- applicator according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 230000005855 radiation Effects 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 2
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- 239000000243 solution Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/70—Feed lines
- H05B6/701—Feed lines using microwave applicators
Definitions
- the subject of this invention is a microwave applicator whose particular function is to converge a microwave beam from a waveguide towards a substantially punctual area.
- An essential application of these devices is the surface scarification of concrete in order to remove a crust liable to be contaminated: by converging under this crust,. the microwaves produce sufficient local heating to evaporate the water contained in the concrete and give rise to a pressure which erodes the crust. .11 then simply move the applicator in parallel lines to strip the concrete in strips.
- French Patent 2,759,239 proposed a solution for obtaining this convergence of microwaves from a divergent beam, not focused, at the exit of a waveguide: the applicator included an envelope with an ellipsoidal reflecting internal face.
- microwaves at the bottom of which the microwave guide led and which included an opening opposite this bottom, oriented towards the concrete wall, as well as a central reflector placed in the envelope around the first focal point of the ellipsoid and having a face reflecting the microwaves and directed towards the bottom of the envelope.
- This arrangement came from the idea of exploiting the geometrical properties of the ellipse and in particular that a wave successively reflected by a focal point then the contour of an ellipse necessarily reaches the second home.
- the reflecting envelope was in the form of an ellipse portion and the central reflector was located at the first focus of this ellipse and had a substantially circular shape to reproduce as much as possible a reflection on a point.
- the radiation successively reflected by the central reflector and then by the envelope came out of it and indeed converged at the second focus of the ellipse, under the concrete crust. It was planned to focus either genuinely on a point, with an ellipsoid envelope and a spherical reflector, or on a line - which was preferred in practice in order to scarify the concrete by wide bands - if the envelope was formed of elliptical sections similar to each other and if the central reflector was cylindrical.
- the object of the invention is to remedy this drawback and to involve all of the microwaves in the heating of the focal point.
- the applicator comprises an envelope with a reflective inner face having an opposite bottom and an opening, the microwave guide opening into the bottom of the envelope, and a central reflector, arranged in the envelope and comprising one side facing the micro guide waves and shaped so that the microwaves are reflected by said face of the reflector and then by the inner face of the envelope, substantially converging towards a focal point located in front of the opening of the envelope, characterized in that said face of the reflector central includes, on the sides of the microwave guide, a first facet, central, and a second facet, lateral, and the inner face of the envelope comprises, on each side of the microwave guide, a first facet, central, a second facet then a third facet, the facets being shaped so that a first portion of the microwaves reaches the focus after having been reflected by the second facet of the central reflector then the second facet of the envelope, and a second portion of microwaves reaches the hearth after being reflected by the first facet of the central reflector, the
- the second facet of the central reflector can be curved and convex and the second facet of the elliptical envelope; or the first facet of the central reflector is plane, the first facet of the envelope is circular and concave and the third facet of the envelope is plane.
- - Figure 1 is a view of the applicator
- - Figure 2 is a view of an improvement of one applicator
- FIG. 4 is a complete diagram of the reflection of microwaves.
- the applicator comprises a microwave guide 1 and a mouthpiece 2 composed of an envelope 3 and a central reflector 4 retained at the envelope 3 by means 5.
- the microwave guide 1 opens into an opening 6 operated in the bottom of the casing 2, which further comprises a main opening 7 much wider at its opposite part.
- This main opening 7 is in usual use placed in front of a material 8 such as a concrete wall which it is desired to subject to heat.
- the microwaves, which come from guide 1 are liable to leave it by dispersing in a fairly large opening angle, which may be 30 °, on each side of a plane 9 of symmetry of the applicator.
- the internal face of the envelope 3 reflects the microwaves, as well as a face directed towards the microwave guide 1 of the central reflector 4.
- This last face comprises two facets on each side of the plane 9: a first facet 10, central and oblique, which touches the plane 9, and a second facet 11 lateral, also oblique and extending to the edge of the central reflector 4.
- the inner face of the envelope 3 comprises three facets: a first facet 12 adjacent to the microwave guide 1, a second facet 13 extending the previous, and a third facet 14 extending the previous one and going to the edge of the main opening 7.
- the radiation close to the plane 9 and reaching the first facet 10 of the central reflector 4 is first reflected towards the first facet 12 from the envelope 3, then towards the third facet 14 before arriving near a point 16 of convergence in front of the mouth 2.
- the more inclined radiation and reaching the second facet 11 of the central reflector 4 arrives at point 16 after a unique reflection against the second facet 13 of the envelope 3.
- This second facet 13 of the envelope 3 can keep the elliptical shape, characteristic of the known applicator; the second facet 11 of the central reflector 4 can take various forms, but it has been found that the planar facets were often insufficient since it was necessary to give them, to intercept all the radiation of the guide 1, a fairly large width without intercepting the portion radiation already reflected passing through the space between the facets 12 and 14 of the envelope 3. This is why a curved and convex shape, always more inclined towards the point 16 when approaching the edge of the reflector 4, is recommended.
- the first facet 10 of the central reflector 4 can perfectly be flat, of same as the facet 14 of the envelope 3 on which the corresponding portion of the radiation is reflected.
- the third facet 14 that we choose to build plane, while the first facet 12 of the envelope 3 is concave, curved in an arc, in order to make the radiation convergent.
- the concavity of the facet 13 of the envelope 3 must be greater than the convexity of the second facet 11 of the central reflector 4.
- the envelope 3 like the central reflector 4 are symmetrical with respect to the plane '9.
- the facets 12, 13 and 14 of the envelope 3 may or may not be contiguous. The simulations carried out showed that almost all the radiation actually reached the vicinity of point 16 of convergence. Reference can be made to FIG. 3 to observe a complete example of focusing of the radiation.
- Figure 1 illustrates some other aspects of the invention.
- the mouth 2 extends at constant cross section in the depth direction, so that the focusing point 16 will in reality be a line whose displacement in a perpendicular direction, produced by a movement of the applicator, will sweep a strip 17 of concrete 8.
- the casing 3 is closed by lateral cheeks 18, one of which is shown in cutaway.
- the waveguide 1 can include an impedance adapter 19 in the form of a waveguide section 20 pierced with parallel holes 21 to receive plugs or stubs 22 which obstruct partially the opening, and whose capacitive or inductive impedance compensates for the reactive part of the load (ie concrete where the waves are focused).
- Other screens may be suitable.
- An advantageous variant consists in placing laterally, in the vicinity of the main opening 7, a skirt J of material with low permittivity and very low losses, fixed on the applicator around the opening 7 so as to delimit between the applicator and the object on which the microwaves are focused a space in which the waste from peeling is retained.
- An improvement of this skirt consists in providing it with a lateral suction orifice M of rubble and any water vapor, using suction means not shown as known to the person skilled in the art.
- Another advantageous variant which can be combined with the previous ones, consists in connecting one or more holes 21 to a pipe 23 of a gas source 24 the aim of which is to create a positive pressure in the mouth 2 in order to expel the concrete debris and the dust which could be thrown into it by virtue of a flow directed towards the opening 7. It is also advantageous that the central reflector 4 completely covers the orifice of the waveguide 1 to help protect it from projections.
- FIG. 2 shows the applicator provided with a skirt J made of material with low permittivity and very low losses, fixed on the applicator around the opening 7, and provided with a lateral suction orifice M. 'peeling retained by the skirt (J) can then be removed by suction means not shown as known.
- the applicator provided with a skirt provided with the suction orifice M is also provided with anti-plating means intended to keep the distance H between the applicator approximately constant the object on which the microwaves are focused, despite the aspiration.
- the anti-plating means may, for example, consist of rollers or balls mounted on the skirt J.
- the invention is also applicable in all cases, industrial or medical, where one seeks to focus microwaves in an area of small dimensions located a short distance in front of an applicator. It is recalled for this purpose that, according to the name commonly used, microwaves correspond to the frequency band extending between 300 MHz and 300 GHz. It would therefore not be departing from the scope of the invention to easily vary this frequency in the range above. We would not go beyond the scope of the invention by adapting the dimensions of the applicator so that the waves penetrate the new material in which we wish to focus microwaves according to the Brewster angle of this material.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Constitution Of High-Frequency Heating (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0009607 | 2000-07-21 | ||
| FR0009607A FR2812166B1 (fr) | 2000-07-21 | 2000-07-21 | Applicateur de micro-ondes focalisant |
| PCT/FR2001/002378 WO2002009477A1 (fr) | 2000-07-21 | 2001-07-20 | Applicateur de micro-ondes focalisant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1206901A1 true EP1206901A1 (fr) | 2002-05-22 |
| EP1206901B1 EP1206901B1 (fr) | 2004-01-28 |
Family
ID=8852793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01958150A Expired - Lifetime EP1206901B1 (fr) | 2000-07-21 | 2001-07-20 | Applicateur de micro-ondes focalisant |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6583395B2 (fr) |
| EP (1) | EP1206901B1 (fr) |
| JP (1) | JP2004504707A (fr) |
| AU (1) | AU2001279885A1 (fr) |
| DE (1) | DE60101885T2 (fr) |
| FR (1) | FR2812166B1 (fr) |
| WO (1) | WO2002009477A1 (fr) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE398974T1 (de) * | 2002-11-27 | 2008-07-15 | Medical Device Innovations Ltd | Coaxiale gewebeablationsprobe und verfahren zum herstellen eines symmetriergliedes dafür |
| WO2005115235A1 (fr) * | 2004-05-26 | 2005-12-08 | Medical Device Innovations Limited | Dispositif de detection et d'ablation de tissus et dispositif et procede pour actionner un syntoniseur |
| JP2008519608A (ja) * | 2004-11-12 | 2008-06-12 | ノース カロライナ ステイト ユニバーシティー | 食品及び他の生物材料の熱処理法及び装置、並びにそれによって得られる製品 |
| CA2659125A1 (fr) * | 2006-07-28 | 2008-01-31 | Mcgill University | Systeme et procede de forage assiste par energie electromagnetique |
| WO2011086393A2 (fr) * | 2010-01-18 | 2011-07-21 | Ems Waves Limited | Émetteur de micro-ondes |
| CN106576402B (zh) * | 2014-07-29 | 2019-11-05 | 三菱电机株式会社 | 微波加热照射装置 |
| JP2024508790A (ja) | 2021-02-22 | 2024-02-28 | オフワールド,インコーポレイテッド | ロボットアーム導波管を用いたマイクロ波ベースの採掘システム及び方法 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5919423B2 (ja) * | 1977-07-07 | 1984-05-07 | 三菱電機株式会社 | マイクロ波照射装置 |
| US4839494A (en) * | 1988-06-03 | 1989-06-13 | Ntronix, Inc. | Electromagnetic container sealing apparatus |
| US5449889A (en) * | 1992-10-30 | 1995-09-12 | E. I. Du Pont De Nemours And Company | Apparatus, system and method for dielectrically heating a medium using microwave energy |
| US5635143A (en) * | 1994-09-30 | 1997-06-03 | Martin Marietta Energy Systems, Inc. | Mobile system for microwave removal of concrete surfaces |
| FR2759239B1 (fr) * | 1997-01-31 | 1999-03-05 | Commissariat Energie Atomique | Applicateur de micro-ondes, et son application a la scarification superficielle du beton contamine |
| FI103917B1 (fi) * | 1998-06-25 | 1999-10-15 | Elmatec Oy | Kannettava mikroaaltokuivauslaite |
| US6265702B1 (en) * | 1999-04-28 | 2001-07-24 | Industrial Microwave Systems, Inc. | Electromagnetic exposure chamber with a focal region |
-
2000
- 2000-07-21 FR FR0009607A patent/FR2812166B1/fr not_active Expired - Fee Related
-
2001
- 2001-07-20 EP EP01958150A patent/EP1206901B1/fr not_active Expired - Lifetime
- 2001-07-20 JP JP2002513852A patent/JP2004504707A/ja not_active Withdrawn
- 2001-07-20 WO PCT/FR2001/002378 patent/WO2002009477A1/fr not_active Ceased
- 2001-07-20 US US10/070,640 patent/US6583395B2/en not_active Expired - Fee Related
- 2001-07-20 AU AU2001279885A patent/AU2001279885A1/en not_active Abandoned
- 2001-07-20 DE DE60101885T patent/DE60101885T2/de not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0209477A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE60101885T2 (de) | 2004-10-14 |
| FR2812166A1 (fr) | 2002-01-25 |
| US6583395B2 (en) | 2003-06-24 |
| WO2002009477A1 (fr) | 2002-01-31 |
| AU2001279885A1 (en) | 2002-02-05 |
| FR2812166B1 (fr) | 2002-12-13 |
| EP1206901B1 (fr) | 2004-01-28 |
| JP2004504707A (ja) | 2004-02-12 |
| DE60101885D1 (de) | 2004-03-04 |
| US20020134779A1 (en) | 2002-09-26 |
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