EP1238388B1 - Piezoelektrischer ultraschallwandler, der ein gehäuse und eine isolierschicht umfasst - Google Patents
Piezoelektrischer ultraschallwandler, der ein gehäuse und eine isolierschicht umfasst Download PDFInfo
- Publication number
- EP1238388B1 EP1238388B1 EP00991061A EP00991061A EP1238388B1 EP 1238388 B1 EP1238388 B1 EP 1238388B1 EP 00991061 A EP00991061 A EP 00991061A EP 00991061 A EP00991061 A EP 00991061A EP 1238388 B1 EP1238388 B1 EP 1238388B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- piezoelectric ultrasonic
- ultrasonic transformer
- insulating layer
- layer
- 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
Links
- 239000000463 material Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 claims 3
- 229910010293 ceramic material Inorganic materials 0.000 claims 2
- 239000010410 layer Substances 0.000 description 38
- 239000007788 liquid Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 239000012790 adhesive layer Substances 0.000 description 5
- 238000002604 ultrasonography Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 239000011224 oxide ceramic Substances 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
Definitions
- the invention relates to a piezoelectric ultrasonic transducer comprising a housing and one with the housing over an insulating layer connected piezoelectrically active Layer.
- Such an ultrasonic transducer is suitable both for transmission as well as to receive ultrasound. He can in gases and used in liquids. Such an ultrasonic transducer is for example in a flow meter for determining the flow rate of a gas or a Liquid used. Also, such an ultrasonic transducer for determining the liquid level in a container used by means of a transit time measurement of ultrasonic pulses.
- the piezoelectric active layer usually with Voltage pulses for emitting an ultrasonic pulse stimulated. Conversely, the detection of an ultrasound pulse takes place via a voltage signal which the piezoelectric releases active layer. For particularly effective blasting from ultrasound in one direction without much signal loss is the piezoelectrically active layer in a suitable Housing installed.
- the layer components of the ultrasonic transducer are conventional with each other and with the case via an adhesive firmly connected.
- the layers and the housing can not made of materials with identical thermal expansion coefficients be constructed, as e.g. from EP-A-0749005 or EP-A-0594331.
- specific materials from safety engineering Reasons even required. With temperature changes This leads to the fact that due to different temperature expansions Tensions occur in the composite system, the outwardly by a bending can show. This mechanical Tensions are a static continuous Load, which depends on the temperature and in the long term that Composite system damages.
- Ultrasonic transducers are known for solving this problem. where the individual layers and the housing with each other connected via highly elastic adhesive or thick adhesive layers are. Highly elastic adhesive and thick adhesive layers lead but disadvantageously to a high attenuation of the emitted Ultrasonic signal.
- the object of the invention is a piezoelectric ultrasonic transducer specify the type mentioned, the also when used with frequent temperature changes a long life shows.
- This task is for a piezoelectric ultrasonic transducer of the aforementioned type according to the invention thereby solved that in addition between insulating layer and housing a matching layer is arranged whose thermal expansion coefficient a value between the values of the expansion coefficients comprising the housing and the insulating layer.
- the housing a metallic housing. In this way, the Advantageously couple sound into liquids.
- the housing made of a steel, in particular made of a stainless steel.
- any material that has the piezoelectric Effect shows, for the piezoelectrically active layer is suitable, it is nevertheless advantageous for technical applications, when the piezoelectrically active layer of a piezoceramic consists.
- a homogeneous electric Field is generated a polar axis in the piezoceramic, necessary for the occurrence of the piezoelectric effect is.
- a piezoceramic allows its composition Adaptation to different requirements.
- a suitable Piezoceramic is for example a so-called PZT ceramic, by a lead zirconate titanium oxide ceramic understood becomes.
- the insulating layer consists of a ceramic, in particular from an alumina ceramic.
- a ceramic in particular from an alumina ceramic.
- Such ceramics show good mechanical properties with high electrical Insulation.
- a Alumina ceramic by a similar coefficient of thermal expansion like a lead zirconate titanium oxide ceramic out.
- the matching layer consists of titanium or a steel of the material number 1.4021, 1.4460 or 1.4462.
- the thermal expansion coefficients of these materials are 8 ⁇ 10 -6 / K to 12 ⁇ 10 -6 / K, all between the thermal expansion coefficient of the alumina Kermik of 7 ⁇ 10 -6 / K and the thermal expansion coefficient of steel of the material number 1.4571 for the Housing of 17 ⁇ 10 -6 / K.
- the material numbers are the "steel key", Verlag Stahl Whyl Wegst GmbH, 18th edition, 1998, Marbach, taken. There you will find the corresponding compositions.
- the layer system of Ultrasonic transducer connect together when the layers each other and the matching layer with the housing by means of a Epoxy resin are glued.
- the figure shows in perspective partially broken Representation of an ultrasonic transducer 1 with a housing 2 and layer system arranged therein.
- the ultrasonic transducer 1 radiates in the direction of the housing bottom 3 ultrasonic signals from or detected coming from this direction Ultrasound signals.
- the ultrasonic transducer 1 itself is rotationally symmetrical.
- the layer system of the ultrasonic transducer 1 comprises a piezoelectric active layer 4 of a lead zirconate titanium oxide ceramic, an insulating layer 5 made of an alumina ceramic and a matching layer 6 made of titanium.
- the piezoelectric active layer 4, the insulating layer 5 and the matching layer 6 are each with each other via adhesive layers 8 Epoxy resin firmly connected.
- the matching layer 6 is over a further epoxy adhesive layer 8 with the housing bottom. 3 bonded.
- the illustrated ultrasonic transducer 1 has a diameter of 30 mm.
- the adhesive layers 8 are about 5 microns thick.
- the Thickness of the piezoelectrically active layer 4 is about 1 mm.
- the insulating layer 5 has a thickness of about 1/10 mm.
- the matching layer is about 2 mm thick.
- the housing 2 consists of a stainless steel with the material number 1.4571.
- the layer system of the ultrasonic transducer 1 is in the housing 2 poured over an insulating material 10.
- insulating material 10 is epoxy resin used.
- the electrical connections 11 are with a surface, not visible in the drawing, made of sputtered gold electrode on top the insulating layer or with the on top of the piezoelectrically active layer 4 applied surface electrode 12 connected.
- the electrode 12 consists of a Sputter layer consisting of the metals Cr / Pt / Au.
- the illustrated ultrasonic transducer 1 is particularly suitable for use in aggressive or explosive atmospheres Gases and liquids, where he also frequent temperature changes is exposed. Such an application For example, the use of the ultrasonic transducer 1 in Flow meters.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Measuring Volume Flow (AREA)
Description
Claims (7)
- Piezoelektrischer Ultraschallwandler (1) umfassend ein Gehäuse (2) und eine mit dem Gehäuse (2) über eine Isolierschicht (5) verbundene piezoelektrisch aktive Schicht (4), wobei zusätzlich zwischen Isolierschicht (5) und Gehäuse (2) eine Anpaßschicht (6) angeordnet ist, deren thermischer Ausdehnungskoeffizient einen Wert zwischen den Werten der Ausdehnungskoeffizienten des Gehäuses (2) und der Isolierschicht (5) aufweist.
- Piezoelektrischer Ultraschallwandler (1) nach Anspruch 1, wobei das Gehäuse (2) ein metallisches Gehäuse ist.
- Piezoelektrischer Ultraschallwandler (1) nach Anspruch 1 oder 2, wobei das Gehäuse (2) aus einem Stahl, insbesondere aus einem Edelstahl, besteht.
- Piezoelektrischer Ultraschallwandler (1) nach einem der vorhergehenden Ansprüche, wobei die piezoelektrisch aktive Schicht (4) aus einer Piezokeramik besteht.
- Piezoelektrischer Ultraschallwandler (1) nach einem der vorhergehenden Ansprüche, wobei die Isolierschicht (5) aus einer Keramik, insbesondere aus einer Aluminiumoxid-Keramik, besteht.
- Piezoelektrischer Ultraschallwandler (1) nach einem der vorhergehenden Ansprüche, wobei die Anpaßschicht (6) aus Titan oder einem Stahl der Werkstoffnummern 1.4021, 1.4460 oder 1.4462 besteht.
- Piezoelektrischer Ultraschallwandler (1) nach einem der vorhergehenden Ansprüche, wobei die Schichten miteinander und die Anpaßschicht (6) mit dem Gehäuse (2) mittels eines Epoxidharzes verklebt sind.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19961095 | 1999-12-17 | ||
| DE19961095 | 1999-12-17 | ||
| PCT/DE2000/004455 WO2001045081A1 (de) | 1999-12-17 | 2000-12-14 | Piezoelektrischer ultraschallwandler umfassend ein gehäuse und eine isolierschicht |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1238388A1 EP1238388A1 (de) | 2002-09-11 |
| EP1238388B1 true EP1238388B1 (de) | 2005-03-02 |
Family
ID=7933162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00991061A Expired - Lifetime EP1238388B1 (de) | 1999-12-17 | 2000-12-14 | Piezoelektrischer ultraschallwandler, der ein gehäuse und eine isolierschicht umfasst |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20020180316A1 (de) |
| EP (1) | EP1238388B1 (de) |
| DE (1) | DE50009672D1 (de) |
| WO (1) | WO2001045081A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008055123B3 (de) * | 2008-12-23 | 2010-07-22 | Robert Bosch Gmbh | Ultraschallwandler zum Einsatz in einem fluiden Medium |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2005029912A1 (ja) * | 2003-09-18 | 2006-11-30 | 松下電器産業株式会社 | 超音波振動子を用いた超音波流量計 |
| DE10344741A1 (de) * | 2003-09-25 | 2005-04-14 | Endress + Hauser Gmbh + Co. Kg | Schall- oder Ultraschallwandler |
| US7358645B2 (en) * | 2004-08-19 | 2008-04-15 | Siemens Medical Solutions Usa, Inc. | Backing, transducer array and method for thermal survival |
| US7589456B2 (en) * | 2005-06-14 | 2009-09-15 | Siemens Medical Solutions Usa, Inc. | Digital capacitive membrane transducer |
| DE102005044880C5 (de) * | 2005-09-20 | 2017-10-05 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Ultraschalllwandler für einen Einsatz bei hohen und/oder tiefen Temperaturen |
| KR100849624B1 (ko) | 2007-04-05 | 2008-07-31 | (주)피코소닉 | 노이즈 저감형의 비파괴검사용 초음파 변환기 |
| ES2339626B1 (es) * | 2007-11-06 | 2010-12-03 | Zunibal, S.L. | Transductor ultrasonico perfeccionado. |
| US9502023B2 (en) * | 2013-03-15 | 2016-11-22 | Fujifilm Sonosite, Inc. | Acoustic lens for micromachined ultrasound transducers |
| FR3039003B1 (fr) | 2015-07-17 | 2017-07-28 | Soitec Silicon On Insulator | Procede de fabrication d'un substrat |
| CN106153080B (zh) * | 2016-06-21 | 2019-08-23 | 中国飞机强度研究所 | 一种可移动式压电传感器及使用方法 |
| CN113491563A (zh) * | 2020-04-01 | 2021-10-12 | 盈甲医疗器械制造(上海)有限公司 | 用于超声外科手术切割器械的换能装置及其超声外科器械 |
| DE102021107559A1 (de) | 2021-03-25 | 2022-09-29 | Endress+Hauser Conducta Gmbh+Co. Kg | Verfahren zur Qualitätsprüfung von Ultraschallwandlern |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4825117A (en) * | 1987-11-27 | 1989-04-25 | General Electric Company | Temperature compensated piezoelectric transducer assembly |
| JP3238492B2 (ja) * | 1992-10-19 | 2001-12-17 | 株式会社タイセー | 圧電センサ |
| DE29509574U1 (de) * | 1995-06-12 | 1996-07-11 | Siemens AG, 80333 München | Schallwandler |
| DE29611678U1 (de) * | 1996-07-04 | 1997-08-07 | Siemens AG, 80333 München | Schallwandler, insbesondere Ultraschallwandler |
-
2000
- 2000-12-14 WO PCT/DE2000/004455 patent/WO2001045081A1/de not_active Ceased
- 2000-12-14 DE DE50009672T patent/DE50009672D1/de not_active Expired - Fee Related
- 2000-12-14 EP EP00991061A patent/EP1238388B1/de not_active Expired - Lifetime
-
2002
- 2002-06-17 US US10/174,058 patent/US20020180316A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008055123B3 (de) * | 2008-12-23 | 2010-07-22 | Robert Bosch Gmbh | Ultraschallwandler zum Einsatz in einem fluiden Medium |
Also Published As
| Publication number | Publication date |
|---|---|
| US20020180316A1 (en) | 2002-12-05 |
| EP1238388A1 (de) | 2002-09-11 |
| WO2001045081A1 (de) | 2001-06-21 |
| DE50009672D1 (de) | 2005-04-07 |
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