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EP0792085A2 - Vorrichtung und Verfahren zum Aufheizen von Gegenstandes mittels Mikrowellen - Google Patents

Vorrichtung und Verfahren zum Aufheizen von Gegenstandes mittels Mikrowellen Download PDF

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Publication number
EP0792085A2
EP0792085A2 EP97300635A EP97300635A EP0792085A2 EP 0792085 A2 EP0792085 A2 EP 0792085A2 EP 97300635 A EP97300635 A EP 97300635A EP 97300635 A EP97300635 A EP 97300635A EP 0792085 A2 EP0792085 A2 EP 0792085A2
Authority
EP
European Patent Office
Prior art keywords
microwaves
microwave
working area
travelling
microwave transmission
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
Application number
EP97300635A
Other languages
English (en)
French (fr)
Other versions
EP0792085A3 (de
EP0792085B1 (de
Inventor
Lawrence Barratt
John Richard Bows
James Thomas Mullin
Renoo Avinash Blindt
James Francis Crilly
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unilever PLC
Unilever NV
Original Assignee
Unilever PLC
Unilever NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Unilever PLC, Unilever NV filed Critical Unilever PLC
Priority to EP19970300635 priority Critical patent/EP0792085B1/de
Priority to ES97300635T priority patent/ES2237785T3/es
Publication of EP0792085A2 publication Critical patent/EP0792085A2/de
Publication of EP0792085A3 publication Critical patent/EP0792085A3/de
Application granted granted Critical
Publication of EP0792085B1 publication Critical patent/EP0792085B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B6/705—Feed lines using microwave tuning
    • 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
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H05B6/688—Circuits for monitoring or control for thawing
    • 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 present invention relates to an apparatus and method for heating objects, such as food products, with microwaves.
  • US 4464554 discloses an excitation system for a microwave oven; means are provided to shift the phase of a standing wave field pattern in a wave guide between a first phase relationship and a second phase relationship, thereby improving the uniformity of a time-averaged energy distribution in the oven cavity.
  • EP 136453, US 4775770, US 4866233 and US 4952763 provide methods for the controlled microwave heating of objects in sealed packages; the microwaves emanate from either one microwave emitter subdivided into two or, preferably, from two microwave emitters.
  • the two resulting power distributions are superposed to a sum field at least when time averaged and the object is placed in a region of maximum field strength of the sum microwave field, thereby achieving a predetermined temperature distribution in the object, the distribution being a scalar addition of the two or more independent temperature fields.
  • FR 2523797 (Centre National de la Reserche Scientifique) discloses means for heating objects with high aspect ratios, such as paper, where the object passes consecutively through slots in two waveguide arms.
  • the microwave fields in the arms are standing waves displaced transversely to the direction of propagation of the object by the waveguide wavelength divided by four.
  • EP 446114 and US 5278375 (Microondes Energy Systemes) disclose similar means for heating sheet objects passed through slots in a waveguide.
  • the present invention seeks to provide an improved apparatus and method for heating objects using microwaves.
  • an apparatus for heating objects using microwaves comprising:
  • the microwaves travelling in the first microwave transmission member and the microwaves travelling in the second microwave transmission member are coherent and mutually exclusive.
  • vector addition of the microwave electric fields occurs to form an interference pattern, or standing wave, in the working area.
  • the interference pattern is of a simple sinusoidal form.
  • the phase of this standing wave can be varied. This is termed phase control.
  • the microwaves used are not coherent and mutually exclusive; hence, scalar addition (rather than vector addition) of the microwave electric fields occurs to form a scalar standing wave in the working area.
  • the phase of this standing wave continuously varies, so it can not be controlled.
  • the object when an object is partly or fully present in the working area, such as when the object is passed through the working area, the object is irradiated by the microwaves travelling in each microwave transmission member.
  • a new and complex interference pattern is generated within the object by vector addition of the incident microwave electric fields.
  • the initial phase of the microwaves is important, and may vary according to the object.
  • the phase of the microwaves in at least one of the microwave transmission members can be varied, thereby generating different interference patterns in the object (with respect to the spatial distribution of the microwave field).
  • Time-averaged superposition of the interference patterns within the object can result in rapid, time-averaged uniform heating of the object in up to three dimensions; hot and cold spots can be effectively eliminated.
  • the depth of heating can also be controlled by using phase control to select interference patterns which, for example, target microwave energy away from the incident surfaces. This is only possible when the microwaves in each transmission member are coherent and mutually exclusive (ie. when cross-talk between the microwaves in each transmission member is substantially avoided to maintain time-averaged coherence) so that interference patterns can be generated from destructive and constructive interference of the microwaves.
  • the power absorbed by a dielectric material is proportional to the square of the electric field.
  • the electric fields add so that the resultant power distribution is proportional to four times the amplitude of either microwave signal.
  • the power distribution set up by each electric field not the electric field itself, add so that the resultant power distribution is proportional to twice the amplitude of either microwave signal (the electric fields continuously constructively and destructively interfere on nanosecond time scales, so the time-averaged power distribution is simply the average electric field strength in the object, that is twice the amplitude of either microwave signal). Therefore, a further advantage of the current invention is that more intensive heating is possible from the same power source.
  • the effective depth of heating can be increased with the use of phase control.
  • the apparatus and method of the present invention provide phase control which, in the direction of phase control, can vary and select heating patterns for time-averaged targeted- or even-heating of an object.
  • the effective depth and intensity of the targeted- or even-heating can also be increased.
  • Phase control may be applied in one, two or three dimensions in order to achieve time-averaged even heating in one, two or three dimensions, respectively.
  • phase control is applied in one-dimension, other means may be employed to achieve time-averaged even heating in another dimension; for example, the object to be heated is moved in a direction which is perpendicular to the direction of phase control, or the working area is altered by having castellated, dielectrically lined or narrow walls.
  • Providing a number of beams of microwaves from a single microwave source ensures that the beams are coherent.
  • a plurality of phase-locked microwave sources are also coherent.
  • the angle between the respective directions of the first and second beams is preferably 0 to 30, 150 to 210 or 330 to 360 degrees. Preferably, the angle is 180 degrees.
  • the microwave transmission member may be a hollow waveguide, a coaxial cable, microwave stripline, or any other means for transmitting microwaves.
  • the first and second microwave transmission members may be the first and second arms of a single waveguide, which is in the form of a loop.
  • the working area may be formed by the meeting of two waveguides or waveguide arms, so that the object is in an area bound by walls.
  • An alternative is that it may be located between two parallel antennae which are mutually coupled via an object to be heated, so that the object is in a working area not bound by walls.
  • the means for varying the phase of a microwave in the first and/or second microwave transmission member comprises means for altering the path length of a microwave in a microwave transmission member.
  • a sliding short is used to vary the electrical path length of a microwave beam in a waveguide arm.
  • Adjustable stubs, a stub tuner, or other means for changing the effective waveguide length may also be used; for example, full or part introduction of a dielectric material into the transmission arm of a waveguide to change the original path length.
  • the means associated with each microwave transmission member for isolating the microwaves therein may comprise an isolator, such as a microwave circulator.
  • a method for heating objects using microwaves comprising:
  • the present invention therefore provides a dynamic phase control system for the even- or targeted- heating of nonplanar objects in up to three dimensions.
  • the apparatus 2 comprises a microwave generator 4 feeding into a waveguide 6, which is split via an E-plane series tee 7 into a first arm 8 and a second arm 10.
  • the tee is tuned such that power introduced into any arm of the tee is divided such that half the power exits from each of the other two arms of the tee.
  • the microwave generator is a magnetron or a travelling wave tube, for example.
  • a circulator 12 (or other isolating means) is associated with each arm.
  • Circulators are three port ferrite devices which are labelled in the following way in figures 1 and 2:
  • a circulator In normal use, power enters port A from the microwave generator.
  • the isolation of a circulator is customarily defined as how efficient the device is at diverting power entering port B to port C; the higher the isolation, the more power is diverted to port C.
  • all circulators should have better isolation than 10 dB, preferably better than 20 dB, optimally better than 30 dB at the frequency (or over the frequency band) of operation of the microwave generator.
  • a circulator In normal use, a circulator immediately follows a microwave source, with a dummy load 13 attached to port C. Reflected power is diverted from port B to port C thus protecting the source. Dummy loads are usually water cooled, but may be cooled using air or other coolants. Optimally, a dummy load is designed for a circulator to minimise impedance mismatches.
  • the waveguide is a rectangular loop, but may also be a circular loop or a square loop, for example.
  • the end of each arm of the waveguide joins with the end of the other arm.
  • a working area 14 is defined and two opposing waveguide walls have apertures 16 therein; the apertures shown in figure 3 are rectangular. Preferably, these walls do not cut any microwave field lines.
  • the apertures provide means for passing an object through the working area of the waveguide.
  • a feed 17 extends outwardly from each aperture 16 to provide a passageway for feeding the object to the working area 14.
  • Horizontal access to the working area is preferred as a conveyor belt can be run through the working area, with naked or packed objects to be heated on the belt.
  • Two 90-degree-twist-sections 15 may be used and are shown in both figures 1 and 2 to allow horizontal access into the working area. Other 'twist' angles could also be used.
  • the working area may have fully or partly dielectrically lined walls, and also may have fully or partly castellated walls to modify the electric field pattern, and the indentations of the castellated structures may be dielectrically filled.
  • both arms of the waveguide taper towards the working area, as shown in figure 3, preferably over a distance of the waveguide wavelength divided by four, so that the working area is narrowed.
  • the tapered region 19 may be partly or fully dielectrically filled, with for example polytetrafluoroethylene, or with different dielectric materials in each tapered region, to control the impedance matching between the arms and the working area. This allows control of the electric field and/or microwave modes present in the working area.
  • Microwaves from the generator 4 are split into two beams and directed in opposing directions through the waveguide loop (ie. one beam in first arm 8 and one beam in second arm 10).
  • the angle between the respective directions of the beams when entering the working area is 180 degrees.
  • the circulators act to isolate the microwave energy propagated into one arm from the microwave energy propagated into the other arm.
  • the waves travelling in each arm meet and generate a standing wave at the working area and in the region of the waveguide loop bound by the circulators.
  • the microwave energy in each arm is sufficiently isolated using two circulators with dummy loads to prevent substantial cross-talk therebetween.
  • the first arm 8 has a variable path length section which comprises a circulator and a sliding short (instead of a dummy load). Power entering port B leaves at port C to the sliding short 18. Power reflects off the sliding short and re-enters port C but leaves at port A.
  • the short is moved to predetermined positions which alter the electrical path length of a microwave travelling in the arm, thereby varying the phase of the standing wave, as detected at any one position, using for example, a slotted line waveguide 21 with appropriate detector (see figure 2). Consequently, the standing wave can be controllably moved in the region bound by the two circulators 12. Microwaves from the second arm 10 travelling through the working area will enter port A and leave at port B with their path length unaffected.
  • the sliding short is preferably motorised via a programmable computer control system, so that the phase of the microwaves in the first arm 8 can be continuously varied.
  • a four stub tuner 19 is used in the apparatus of figure 2 to balance the amount of power in each arm.
  • Slotted line waveguide 21 is also used to allow access for a probe to measure the relative phase of the standing wave at any instant in time. This measurement might form part of a control system, for example, to enable dynamic control of the phase of the standing wave.
  • control system preferably comprises a motorised sliding short interfaced to a computer.
  • the position and dwell time of the sliding short over the duration of heating an object may be pre-programmed according to the type of object and the final heating profile required.
  • the stub tuner 19 can be used to vary the amplitude of the microwave power in each arm, allowing further control of the resultant power distribution.
  • the E-plane series tee 7 can be tuned to unevenly split the power entering arms 8 and 10, to further control the resultant power distribution. For example, for variable thickness objects, eg objects with a tapered cross-section along the direction of phase control, it may be preferential to impose an initial power distribution to assist the phase control method.
  • slotted line measurements, measurements of the power in each transmission arm, on-line measurement of the object temperature, etc. can provide feedback or feedforward control of the sliding short, stub tuner and/or a tunable E-plane series Tee.
  • the frequency of the microwaves is between 0.4 and 10 GHz.
  • Industrial, Scientific and Medical (ISM) frequencies are preferred, particularly 896, 915, 2450 and 5800 MHz.
  • An object to be heated is passed through the working area 14.
  • the microwaves travelling in each arm hit opposite faces of the object. This generates an interference pattern within the object, the pattern being dependent on the complex permittivity of the object and the phase of the standing wave which is present and adjacent to the object in the working area.
  • the sliding short is moved to vary the path length of the microwave travelling in the first arm, and therefore the phase of the standing wave. This generates at least one other different interference pattern within the object.
  • Controlling changes to the phases of the incident microwaves changes and controls the time-averaged superposition of interference patterns facilitating more effective volumetric heating of the object in up to three dimensions.
  • one interference pattern may be sufficient to achieve the desired heating pattern.
  • This invention therefore achieves an optimisation of the time-averaged superposition of interference patterns.
  • the optimisation may result in interference patterns having different dwell times; the phases used to generate different interference patterns to be superposed are not necessarily 180 degrees out of phase. In contrast, in the prior art, the standing waves for scalar addition to be superposed are approximately 180 degrees out of phase.
  • a waveguide circuit was set up as shown in figure 2.
  • a waveguide having an internal cross section of 248 x 124 mm was used, together with a 5 kW 896 MHz low ripple (less than 5%) microwave generator.
  • the working area comprised a section of waveguide with a hinged lid to facilitate easy removal of objects placed therein.
  • the circulators had isolation characteristics of better than 30 dB at 896 MHz.
  • Model food materials in polyethylene trays were placed in the working area and heated.
  • the model food materials were chosen to be representative of the dielectric properties of many frozen food products (model 1) or high moisture content non-frozen food products (model 2).
  • Properties of the model materials are detailed in the following table.
  • each polyethylene tray 22 had a top edge defining an open face having a width w of 122mm and a length z of 171mm; a base having a width x of 100mm and a length y of 150mm; a depth D of 35mm; a top edge corner radius r 1 of 30mm, a horizontal base corner radius r 2 of 15mm and a vertical base corner radius F of 6mm.
  • the model materials completely filled the trays, but did not overspill.
  • each tray 22 was supported on a polytetrafluoroethylene block 23 positioned at the centre of a working area 14 so that the mid-depth horizontal plane of the tray was approximately coincident with the half height of the waveguide.
  • Block 23 had a width a of 34mm, a height b of 42mm and a length c of 72mm.
  • the model materials were heated for a time sufficient to raise the temperature by a maximum of 20°C.
  • thermal images of the mid-depth horizontal plane of the model material were taken using an infra-red scanner (model 870 obtained from Agema, Sweden).
  • an infra-red scanner model 870 obtained from Agema, Sweden.
  • a layer of polyethylene cling film was placed at the half height of the tray as the model material was prepared in the tray: care was taken to exclude all air bubbles.
  • the cling film and upper half of the model material were simply lifted out to expose the surface of the model material at the half depth height.
  • a three dimensional Finite Element Time Domain (3D FETD) microwave model was also used to simulate heating of the model materials.
  • Figure 5 shows the section of waveguide modelled.
  • the microwave model produced power distributions at the same plane as the measured temperature distributions to allow a qualitative comparison with the thermal images. Constant dielectric properties were assumed in the microwave model to reduce computational times (temperature rises in the experiments were kept to no more than 20°C to minimise the effect of temperature dependent complex permittivity) .
  • a tray containing model material was heated under a constant phase condition, ie the sliding short remained in one position.
  • the 0° phase condition was arbitrarily defined as the home position of the sliding short.
  • a fresh tray of model material was used for each experiment.
  • the sliding short was then moved by a distance known to give a 30° movement in the standing wave pattern in the working area relative to the previous short position. In this way, the heating pattern at the half tray height plane was measured every 30°.
  • the FETD model was run to simulate the above experimental conditions. To compare the measured temperature distributions with the simulated power distributions, the thermal images and simulated power distribution had to be phase matched. For example, say for a given sliding short position the temperature distribution phase matched the simulation power distribution at 120°; when the sliding short was moved by a distance ⁇ , which is known from the dimensions of the sliding short to produce a phase change of 35°, the simulation result at 155° should have matched the corresponding experimental result. NB It is the phase change between the two points which is important and not the absolute phase of either.
  • Model material 1 was heated in the tray; the direction of power flow, and therefore phase control, was parallel to the width w of the top edge of the tray.
  • Figure 6a shows the measured thermal distribution images at each 30° phase change; the lighter the shading, the greater the temperature. It can be seen that the "hot spot" moves through the material.
  • Figure 6b show the simulated power distribution images at each 30° phase change; the lighter the shading, the greater the power.
  • FIG 6b the outline of the top edge of the tray can be seen.
  • the images are of the interior of the tray. It can be seen that there is a very close match in the position and size of the distributions of the thermal images and the FETD simulations at each phase condition.
  • Model material 2 was heated in the tray; the direction of power flow, and therefore phase control, was parallel to the width w of the top edge of the tray.
  • Figure 7a shows the measured thermal distribution images at each 30° phase change; the lighter the shading, the greater the temperature. It can be seen that the "hot spots" move through the material. From a comparison with figure 6a, it can be seen that the thermal distributions for model material 2 were more complex than for model material 1.
  • Figure 7b show the simulated power distribution images at each 30° phase change; the lighter the shading, the greater the power.
  • the images are of the interior of the tray. It can be seen that there is a very close match in the position and size of the distributions of the thermal images and the FETD simulations; ie the same changes in power distribution and heating pattern can be seen as the phase of the standing wave in the working area changes.
  • phase of the standing wave in the working area may be controllably changed in a first direction to obtain the desired heating patterns in one-dimension.
  • phase control is applied in a first dimension and either phase control may also be applied across the second dimension or, more preferably, the object may be moved in a direction which is perpendicular to the first dimension.
  • phase control may be applied across all three dimensions; or phase control may be applied across two dimensions and the object may be moved in a direction which is perpendicular thereto; or phase control may be applied across two dimensions and the working area may have fully or partly dielectrically walls, or have fully or partly castellated walls, or have a narrowed width, as shown in figure 3, to modify the electric field pattern and/or modes present in the working area.
  • a preferred option for three-dimensional heating is to apply phase control in the first dimension, move the object in the second dimension and modify the working area in the third dimension.
  • phase control is applied in at least a first dimension
  • a variety of other means may be used to effect heating in a second and/or a third dimension.
  • the apparatus and method of this invention are suitable for the time-averaged even- or targeted-heating of a three-dimensional solid or particulate solid object, such as a packed food product, in the direction(s) of phase control, in up to three dimensions.
  • a three-dimensional solid or particulate solid object such as a packed food product
  • the object may be chicken coated with batter and breadcrumbs, or vegetables such as peas, broccoli, spinach and sweetcorn. It may also be used for sealing lids or heating plastics.
  • the object may be pre-packed in a container (eg a tray with a film lid; a bag or pouch; a plastic can; a plastic can having a metal top and a metal base.) If the object is pre-packed, it is preferably packed with a means for minimising deformation of the pack during heating and cooling (eg using a rigid sleeve). If the object is to be heated above 100°C, then external pressure may be applied.
  • a container eg a tray with a film lid; a bag or pouch; a plastic can; a plastic can having a metal top and a metal base.
  • the food product may be initially at ambient, chilled or freezing temperatures.
  • this invention is used to heat food products to temperatures of above 50°C, particularly to pasteurisation temperatures (eg 70°C) and to sterilisation temperatures (eg greater than 120°C).
  • This invention is also suited for tempering frozen objects, such as poultry, where the object is at freezing temperatures and is raised in temperature to just below its defrosting temperature.
  • the invention may provide controlled heating such that one component receives more heat energy than another.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
EP19970300635 1996-02-23 1997-01-31 Vorrichtung und Verfahren zum Erhitzen von Gegenständen mittels Mikrowellen Expired - Lifetime EP0792085B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19970300635 EP0792085B1 (de) 1996-02-23 1997-01-31 Vorrichtung und Verfahren zum Erhitzen von Gegenständen mittels Mikrowellen
ES97300635T ES2237785T3 (es) 1996-02-23 1997-01-31 Aparato y procedimiento para calentar objetos con microondas.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP96301230 1996-02-23
EP96301230 1996-02-23
EP19970300635 EP0792085B1 (de) 1996-02-23 1997-01-31 Vorrichtung und Verfahren zum Erhitzen von Gegenständen mittels Mikrowellen

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EP0792085A2 true EP0792085A2 (de) 1997-08-27
EP0792085A3 EP0792085A3 (de) 2000-04-12
EP0792085B1 EP0792085B1 (de) 2005-03-23

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0991136A1 (de) * 1998-09-29 2000-04-05 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Vorrichtung und Verfahren zum Erwärmen von Bauteilen aus mikrowellenabsorbierendem Kunststoff
EP1311791A2 (de) * 2000-08-16 2003-05-21 John F. Novak Verfahren und vorrichtung zur verwendung von mikrowellen
US20100163552A1 (en) * 2006-08-28 2010-07-01 Youngtack Shim Electromagnetically-countered microwave heating systems and methods
ES2489292A1 (es) * 2013-02-18 2014-09-01 Tridogen S.L. Procedimiento de suministro de energía a un material y dispositivo correspondiente
WO2020002497A1 (de) * 2018-06-29 2020-01-02 Gerlach Maschinenbau Gmbh Vorrichtung und verfahren zum vernetzen mit geregelten mikrowellen
US20210206030A1 (en) * 2018-05-21 2021-07-08 Microwave Chemical Co., Ltd. Molding apparatus, mold, and method for manufacturing molded piece
CN113243988A (zh) * 2021-06-24 2021-08-13 北京东方略生物医药科技股份有限公司 微波消融装置
CN113303901A (zh) * 2021-06-24 2021-08-27 北京东方略生物医药科技股份有限公司 微波消融装置和系统
TWI786015B (zh) * 2022-04-22 2022-12-01 宏碩系統股份有限公司 單源微波加熱裝置

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Publication number Priority date Publication date Assignee Title
FR2128936A5 (de) * 1971-03-09 1972-10-27 Thomson Csf
US4323746A (en) * 1980-01-28 1982-04-06 Jova Enterprises, Inc. Microwave heating method and apparatus
US4378806A (en) * 1980-08-12 1983-04-05 Henley Cohn Julian L Gapped resonant microwave apparatus for producing hyperthermia therapy of tumors
EP0085110A1 (de) * 1981-08-07 1983-08-10 Matsushita Electric Industrial Co., Ltd. Hochfrequenzerwärmer
FR2709912A1 (fr) * 1993-09-09 1995-03-17 Renault Procédé et dispositif de traitement homogène par micro-ondes de matériaux.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128936A5 (de) * 1971-03-09 1972-10-27 Thomson Csf
US4323746A (en) * 1980-01-28 1982-04-06 Jova Enterprises, Inc. Microwave heating method and apparatus
US4378806A (en) * 1980-08-12 1983-04-05 Henley Cohn Julian L Gapped resonant microwave apparatus for producing hyperthermia therapy of tumors
EP0085110A1 (de) * 1981-08-07 1983-08-10 Matsushita Electric Industrial Co., Ltd. Hochfrequenzerwärmer
FR2709912A1 (fr) * 1993-09-09 1995-03-17 Renault Procédé et dispositif de traitement homogène par micro-ondes de matériaux.

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0991136A1 (de) * 1998-09-29 2000-04-05 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Vorrichtung und Verfahren zum Erwärmen von Bauteilen aus mikrowellenabsorbierendem Kunststoff
US6211503B1 (en) 1998-09-29 2001-04-03 Fraunhofer Gesellschaft Zur Forderung Der Angeandten Forschung E.V Device and method of heating components made of microwave absorbing plastic
SG82644A1 (en) * 1998-09-29 2001-08-21 Dommer Armin Device and method of heating components made of microwave absorbing plastic
EP1311791A2 (de) * 2000-08-16 2003-05-21 John F. Novak Verfahren und vorrichtung zur verwendung von mikrowellen
EP1311791A4 (de) * 2000-08-16 2004-08-11 John F Novak Verfahren und vorrichtung zur verwendung von mikrowellen
US8809753B2 (en) * 2006-08-28 2014-08-19 Youngtack Shim Electromagnetically-countered microwave heating systems and methods
US20100163552A1 (en) * 2006-08-28 2010-07-01 Youngtack Shim Electromagnetically-countered microwave heating systems and methods
ES2489292A1 (es) * 2013-02-18 2014-09-01 Tridogen S.L. Procedimiento de suministro de energía a un material y dispositivo correspondiente
US20210206030A1 (en) * 2018-05-21 2021-07-08 Microwave Chemical Co., Ltd. Molding apparatus, mold, and method for manufacturing molded piece
WO2020002497A1 (de) * 2018-06-29 2020-01-02 Gerlach Maschinenbau Gmbh Vorrichtung und verfahren zum vernetzen mit geregelten mikrowellen
CN113243988A (zh) * 2021-06-24 2021-08-13 北京东方略生物医药科技股份有限公司 微波消融装置
CN113303901A (zh) * 2021-06-24 2021-08-27 北京东方略生物医药科技股份有限公司 微波消融装置和系统
CN113243988B (zh) * 2021-06-24 2022-11-18 北京东方略生物医药科技股份有限公司 微波消融装置
TWI786015B (zh) * 2022-04-22 2022-12-01 宏碩系統股份有限公司 單源微波加熱裝置

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EP0792085B1 (de) 2005-03-23
ES2237785T3 (es) 2005-08-01

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