EP1019903B1 - Vorrichtung zur erzeugung von ultraschallfeldern - Google Patents
Vorrichtung zur erzeugung von ultraschallfeldern Download PDFInfo
- Publication number
- EP1019903B1 EP1019903B1 EP98954231A EP98954231A EP1019903B1 EP 1019903 B1 EP1019903 B1 EP 1019903B1 EP 98954231 A EP98954231 A EP 98954231A EP 98954231 A EP98954231 A EP 98954231A EP 1019903 B1 EP1019903 B1 EP 1019903B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- elements
- array elements
- electrolyte
- array
- electrodes
- 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.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K15/00—Acoustics not otherwise provided for
- G10K15/04—Sound-producing devices
- G10K15/06—Sound-producing devices using electric discharge
Definitions
- the invention relates to a device for generating of ultrasound fields, the ultrasound generation taking Application of the thermohydraulic principle in liquids takes place with at least two electrodes that are a volume trap with an electrolyte and from a power pulse generator can be controlled, and with a sounder surface.
- Ultrasound continues in many areas of technology specifically used in medicine. Examples of the latter Applications are imaging diagnostic procedures in medicine, like the ultrasound examination of internal organs and fetuses in pregnant women. Examples of general Technology are the crack-localization of highly stressed areas Parts or sonar procedures.
- Ultrasonic fields have recently been used in Hyperthermia procedures in medical treatment and of surgery.
- a prerequisite is a high one spatial resolution or good focusability. Therefore must have high frequencies in the range above 1 MHz at time averaged sound power from a few watts to a few 100 W can be generated.
- the quality of the wavefront of the The ultrasound field plays a major role in the resolution or focus size.
- US-A-3 688 562 discloses an apparatus for generating ultrasonic fields, with two electrodes, using the thermohydraulic principle in Liquids, the pulses being generated by semiconductor switching elements.
- thermohydraulic principle was also proposed for generating intense pressure pulses in liquids for generation of ultrasonic wave fields. Doing so an electrolyte layer lying between two electrodes heated up by a power pulse of short duration and due to the volume expansion associated with the heating of the electrolyte in the adjacent medium is intense Radiated pressure wave.
- By generating individual pressure pulses According to this procedure it is possible to level or almost arbitrarily shaped wave fronts with amplitudes of several MPa to create. However, there are electrical pulses with top performance in the range of about 100 MW necessary.
- the object is achieved in a device of the type mentioned in that the electrolyte volume to be heated by the electrical pulse is so limited that the electrical power to be applied is controlled by semiconductor switching elements.
- the sound generator surface can preferably be provided either as a two-dimensional array with defined array elements or else as a one-and-a-half-dimensional arrangement of array elements. It is essential in the invention that the sound generator surface is structured so that the individual elements have correspondingly small dimensions. Such elements are also referred to as "Actel" (act uator- el ement s). By using high pulse repetition rates, an ultrasound field of high average power can be generated. It is particularly advantageous that a sound wave front can be shaped almost arbitrarily by targeted control of the individual Actels. The average heat loss in the electrolyte can be removed by cooling, so that stable conditions are present over longer periods of use.
- a carrier electrode 1 is shown, the one acoustically hard, i.e. reflective electrode defined.
- a thin, acoustically transparent membrane-like electrode 3 arranged, which is the control electrode forms.
- a Introduced electrolyte 2 the distance between the Electrodes 1 and 3 and thus the volume of the electrolyte 2 is defined by a spacer 11.
- the spacer can also act as a web the electrolyte volume limit to the side or all around.
- the second electrode 3 is in the present example a carrier film 12 is attached, of which the ultrasound generated enters a sound propagation medium 4.
- 5 is a power pulse generator and 6 denotes a switching element.
- Actel activator element
- the Actel shown in Figure 1 uses the thermoelectric Principle from that in detail in the older, unpublished DE 197 02 593 A1 is described. There is especially the physical connection between Energy expenditure and generated pressure amplitude of an Actel in individual derived.
- FIG. 2 shows a two-dimensional (2D) array, which consists of individual Actels according to Figure 1.
- a continuous Carrier electrode 21 is here with a carrier film 22 with individual metallic areas 23 as control electrodes provided, an electrolyte between the electrodes 21 and 23 can be arranged according to Figure 1, from the illustration is not recognizable in detail according to FIG. 2.
- individual Actels 20, 20 ', 20' '... which defines a two-dimensional array of M Form columns and N rows.
- the electrodes 21 and 23 of 100 ⁇ m are obtained from a Conductivity of the electrolyte of 0.5 ⁇ m a resistance of approx. 50 ⁇ .
- With an energy input per Actel of ⁇ E 1 mJ you need a peak power of 5 kW for a pulse duration of 0.4 ⁇ s.
- the current is about 10 A. at a voltage of 500 V.
- the latter requirements can be met by semiconductor switching elements common today, such as transistors or thyristors become.
- the switching element is an example in FIG designed as a field effect transistor.
- Semiconductor switch possible.
- the pressure amplitude generated with it is typical, for example, of ethylene glycol as an electrolyte about 1 bar.
- Figures 3 to 6 are so-called one and a half dimensions (1.5 D) arrays shown.
- the array is used here 3 for generating cylindrical wave fronts, why on the reverberant electrode 31 with electrolytes 2 strip-shaped control electrodes 33, 33 ', 33' '... on one common carrier film 32 are applied.
- the electrolyte 2 is arranged here continuously, with the Control electrodes 33 each have a narrowly limited volume of electrolyte is activated for generation. A slight crosstalk is harmless.
- FIG. 5 A corresponding arrangement is shown in FIG. 5 for generating spherical wave fronts.
- Carrier electrode 51 is circular, special the control electrodes metallized on the carrier film 52 53, 53 ', 53' '... are ring-shaped.
- the boundary elements are again not shown as in Figure 3. The same applies to the electrolyte layer.
- control electrodes 33 and 53 are the control electrodes 33 and 53 according to FIG. 3 and FIG. 5 each separately and addressable at the same time. It is also a delayed activation of the individual control electrodes possible, whereby by constant time differences, for example, how it works of a "phased array" is achieved.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
- Figur 1
- die Funktionsweise eines einzelnen Actels,
- Figur 2
- eine ebene Anordnung eines zweidimensionalen Arrays aus N x M Elementen,
- Figur 3
- die Draufsicht eines eineinhalbdimensionalen Arrays zur Erzeugung zylindrischer Wellenfronten,
- Figur 4
- einen Schnitt durch eine Anordnung gemäß Figur 3 entlang der Linie IV-IV,
- Figur 5
- ein eineinhalbdimensionales Array zur Erzeugung sphärischer Wellenfronten.
- Figur 6
- einen Schnitt durch eine Anordnung gemäß Figur 5 längs der Linie V-V.
Claims (10)
- Vorrichtung zur Erzeugung von Ultraschallfeldern, wobei die Ultraschallgenerierung unter Anwendung des thermohydraulischen Prinzips in Flüssigkeiten erfolgt, mit wenigstens zwei Elektroden, die ein Volumen mit einem Elektrolyten einschließen und von einem Leistungsimpulsgenerator angesteuert werden, und mit einer Schallgeberoberfläche wobei das vom elektrischen Impuls aufzuheizende Elektrolytvolumen (2) so weit begrenzt ist, daß die aufzubringende elektrische Leistung von Halbleiterschaltelementen (6) beherrscht wird.
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schaltelemente Transistoren (6) oder Thyristoren, beispielsweise Feldeffekttransistoren, sind.
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schallgeberoberfläche als zweidimensionales (2D-)Array mit definierten Array-Elementen (20, 20',20'' ...) strukturiert ist, die einzeln ansteuerbar sind.
- Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Schallgeberoberfläche (22) als phasengesteuertes Array (20) strukturiert ist, wobei die einzelnen Array-Elemente (20, 20',20''...) entsprechende Abmessungen aufweisen.
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß zur Erzeugung von zylindrischen oder sphärischen Wellenfronten eine eineinhalbdimensionale (1,5D-)Anordnung von Arrayelementen vorgesehen ist, die einzeln ansteuerbar sind.
- Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Array-Elemente (20, 20', 20" ...) auf einer gekrümmten Oberfläche angeordnet sind.
- Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß eine Ansteuerelektronik vorhanden ist, mit der die Ansteuerung der einzelnen Array-Elemente (20, 20', 20''...) gleichzeitig, aber unabhängig voneinander erfolgt.
- Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß eine Ansteuerelektronik vorhanden ist, mit der die Ansteuerung der einzelnen Array-Elemente (20, 20', 20'', ... mit vorgebbaren Zeitdifferenzen erfolgt.
- Vorrichtung nach Anspruch 7 oder Anspruch 8, dadurch gekennzeichnet, daß ein Teil der Ansteuerelektronik, wie Treibertransistoren oder eine Diodenmatrix, direkt auf der Trägerelektrode (21, 31, 51) integriert ist.
- Vorrichtung nach einem der vorhergehendem Ansprüche, dadurch gekennzeichnet, daß das Elektrolytvolumen durch Elemente (11) begrenzt wird, die gleichermaßen Abstandshalter zwischen den Elektroden (1,3; 21,23; 31,33; 51,53) bilden.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19743336A DE19743336C2 (de) | 1997-09-30 | 1997-09-30 | Vorrichtung zur Erzeugung von Ultraschallfeldern |
DE19743336 | 1997-09-30 | ||
PCT/DE1998/002870 WO1999017276A1 (de) | 1997-09-30 | 1998-09-28 | Vorrichtung zur erzeugung von ultraschallfeldern |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1019903A1 EP1019903A1 (de) | 2000-07-19 |
EP1019903B1 true EP1019903B1 (de) | 2002-04-17 |
Family
ID=7844243
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98954231A Expired - Lifetime EP1019903B1 (de) | 1997-09-30 | 1998-09-28 | Vorrichtung zur erzeugung von ultraschallfeldern |
Country Status (5)
Country | Link |
---|---|
US (1) | US6366535B1 (de) |
EP (1) | EP1019903B1 (de) |
JP (1) | JP2001518386A (de) |
DE (2) | DE19743336C2 (de) |
WO (1) | WO1999017276A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19743336C2 (de) * | 1997-09-30 | 2002-01-31 | Siemens Ag | Vorrichtung zur Erzeugung von Ultraschallfeldern |
DE10055633C2 (de) * | 2000-11-10 | 2002-10-10 | Siemens Ag | Stoßwellenquelle |
JP6579323B2 (ja) * | 2014-01-24 | 2019-09-25 | 国立大学法人 東京大学 | 超音波発生素子 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1076413B (de) * | 1954-06-02 | 1960-02-25 | Fruengel Frank Dr Ing | Stoss-Schallquelle |
US3688562A (en) * | 1967-12-08 | 1972-09-05 | Automation Ind Inc | Ultrasonic inspection apparatus |
US4040000A (en) * | 1976-08-23 | 1977-08-02 | Teledyne Exploration Company | Solid state high energy electrical switch for under-sea-water electric discharge seismic generator |
US4137991A (en) * | 1976-11-23 | 1979-02-06 | International Business Machines Corporation | Clamped acoustic elastic wave generator |
CA1268851A (en) * | 1987-02-20 | 1990-05-08 | Reginald Montgomery Clements | Method and apparatus for generating underwater acoustics |
DE3811052C1 (de) * | 1988-03-31 | 1989-08-24 | Messerschmitt-Boelkow-Blohm Gmbh, 8012 Ottobrunn, De | |
CA2082080A1 (en) * | 1992-04-20 | 1993-10-21 | Gordon Walter Culp | Thermal urger |
DE19702593C2 (de) * | 1997-01-24 | 2000-07-06 | Siemens Ag | Verfahren und Vorrichtung zur Erzeugung von Stoßwellen für technische, vorzugsweise medizintechnische Anwendungen |
DE19743336C2 (de) * | 1997-09-30 | 2002-01-31 | Siemens Ag | Vorrichtung zur Erzeugung von Ultraschallfeldern |
US5903518A (en) * | 1998-02-23 | 1999-05-11 | The United States Of America As Represented By The Secretary Of The Army | Multiple plasma channel high output variable electro-acoustic pulse source |
-
1997
- 1997-09-30 DE DE19743336A patent/DE19743336C2/de not_active Expired - Fee Related
-
1998
- 1998-09-28 WO PCT/DE1998/002870 patent/WO1999017276A1/de active IP Right Grant
- 1998-09-28 JP JP2000514259A patent/JP2001518386A/ja not_active Withdrawn
- 1998-09-28 DE DE59803879T patent/DE59803879D1/de not_active Expired - Fee Related
- 1998-09-28 EP EP98954231A patent/EP1019903B1/de not_active Expired - Lifetime
-
2000
- 2000-03-30 US US09/539,240 patent/US6366535B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE19743336C2 (de) | 2002-01-31 |
DE59803879D1 (de) | 2002-05-23 |
JP2001518386A (ja) | 2001-10-16 |
US6366535B1 (en) | 2002-04-02 |
WO1999017276A1 (de) | 1999-04-08 |
DE19743336A1 (de) | 1999-04-08 |
EP1019903A1 (de) | 2000-07-19 |
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