WO2001045081A1 - Piezoelektrischer ultraschallwandler umfassend ein gehäuse und eine isolierschicht - Google Patents
Piezoelektrischer ultraschallwandler umfassend ein gehäuse und eine isolierschicht Download PDFInfo
- Publication number
- WO2001045081A1 WO2001045081A1 PCT/DE2000/004455 DE0004455W WO0145081A1 WO 2001045081 A1 WO2001045081 A1 WO 2001045081A1 DE 0004455 W DE0004455 W DE 0004455W WO 0145081 A1 WO0145081 A1 WO 0145081A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- housing
- layer
- ultrasonic transducer
- piezoelectric ultrasonic
- insulating layer
- Prior art date
Links
- 239000000463 material Substances 0.000 claims description 12
- 239000011224 oxide ceramic Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 229910052574 oxide ceramic Inorganic materials 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 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 abstract 2
- 238000009413 insulation Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 38
- 238000002604 ultrasonography Methods 0.000 description 16
- 239000007788 liquid Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 239000012790 adhesive layer Substances 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
- 239000002131 composite material 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
- 239000000203 mixture Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005684 electric field 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
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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 ultrasound transducer comprising a housing and a piezoelectrically active layer connected to the housing via an insulating layer.
- Such an ultrasound transducer is suitable for both sending and receiving ultrasound. It can be used in gases and liquids. Such an ultrasonic transducer is used, for example, in a flow meter to determine the flow rate of a gas or a liquid. Such an ultrasonic transducer is also used to determine the liquid level in a container by means of a runtime measurement of ultrasonic pulses.
- the piezoelectrically active layer is usually excited with voltage pulses to emit an ultrasound pulse. Conversely, the detection of an ultrasound pulse takes place via a voltage signal which is emitted by the piezoelectrically active layer.
- the piezoelectrically active layer m is installed in a suitable housing for particularly effective radiation of ultrasound in one direction with large signal loss.
- the layer components of the ultrasonic transducer are usually with one another and with the housing via an adhesive firmly connected.
- the layers and the housing cannot be constructed from materials with identical thermal expansion coefficients.
- specific materials are even prescribed for safety reasons.
- temperature changes this leads to the fact that, due to different temperature expansions, stresses occur in the composite system, which can be shown externally by bending. These mechanical stresses are a static, continuous load that depends on the temperature and permanently damages the composite system.
- ultrasonic transducers are known in which the individual layers and the housing are connected to one another via highly elastic adhesives or thick adhesive layers.
- highly elastic adhesives and thick adhesive layers disadvantageously lead to high attenuation of the emitted ultrasound signal.
- the object of the invention is to provide a piezoelectric ultrasonic transducer of the type mentioned at the outset, which also shows a long service life when used with frequent temperature changes.
- a matching layer is additionally arranged between the insulating layer and the housing, the thermal expansion coefficient of which has a value between the values of the expansion coefficients of the housing and the insulating layer.
- the housing is a metallic housing. In this way, the sound can advantageously be coupled into liquids.
- the housing consists of a steel, in particular a stainless steel.
- the piezoelectrically active layer consists of a piezoceramic.
- a piezoceramic By creating a homogeneous electric field, a polar axis is generated in the piezoceramic, which is necessary for the occurrence of the piezoelectric effect.
- the composition of a piezoceramic allows it to be adapted to different requirements.
- a suitable piezoceramic is, for example, a so-called PZT ceramic, which is understood to mean a lead zirconate titanium oxide ceramic.
- the insulating layer consists of a ceramic, in particular an aluminum oxide ceramic. Ceramics of this type show good mechanical properties with high electrical insulation.
- an aluminum oxide ceramic is characterized by a thermal expansion coefficient similar to that of a lead zirconate titanium oxide ceramic.
- the thermal expansion coefficients of these materials with 8 • 10 " YK to 12 • 10 " ° / K are all between the thermal expansion coefficient of the aluminum oxide ceramics of 7 ⁇ 10 "D / K and the thermal expansion coefficient of steel with material number 1.4571 for the housing from 17 • 10 ⁇ 6 / K.
- the material numbers are taken from the "Stahl gleichel", Verlag StahlInstitutel Wegst GmbH, 18th edition, 1998, Marbach, where you can find the corresponding compositions.
- the layer system of the ultrasound transducer can be connected to one another particularly inexpensively and simply if the layers are bonded to one another and the matching layer to the housing by means of an epoxy resin.
- the figure shows a perspective, partially broken open view of an ultrasonic transducer 1 with a housing 2 and a layer system arranged therein.
- the ultrasound transducer 1 emits ultrasound signals in the direction of the housing base 3 or detects ultrasound signals coming from this direction.
- the ultrasonic transducer 1 itself is rotationally symmetrical.
- the layer system of the ultrasound transducer 1 comprises a piezoelectrically active layer 4 made of a lead zirconate titanium oxide ceramic, an insulating layer 5 made of an aluminum oxide ceramic and an adaptation layer 6 made of titanium.
- the piezoelec- tnscn artive layer 4, the insulating layer 5 un ⁇ the Anpa " ⁇ -. Scn CHT 6 are firmly connected epoxy resin with each other respectively uoer adhesive layers 8, the matching layer 6 is bonded via a further epoxy resin adhesive layer 8 with the housing-bottom 3.
- the illustrated ultrasonic transducer 1 has a diameter of 30 mm.
- the adhesive layers 8 are approximately 5 ⁇ m thick.
- the thickness of the piezoelectrically active layer 4 is approximately 1 mm.
- the insulating layer 5 has a thickness of approximately 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 cast into the housing 2 via a dam 10.
- Epoxy resin is used as the dam material 10.
- Electrical connections 11 are provided to control the ultrasonic transducer.
- the electrical connections 11 are connected to a flat electrode (not shown in the drawing) made of sputtered gold on the top of the insulating layer or to the electrode 12 which is applied flat on the top of the piezoelectrically active layer 4.
- the electrode ⁇ 2 consists of a sputter layer consisting of ⁇ en metals Cr / Pt / Au.
- Incoming ultrasound signals can also be easily transmitted using the illustrated ultrasound transducer 1 detect the voltage values emitted by the piezoelectrically active layer 4.
- the illustrated ultrasonic transducer 1 is particularly suitable for use in aggressive or explosive gases and liquids, where it is also exposed to frequent temperature changes.
- One such application is, 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)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00991061A EP1238388B1 (de) | 1999-12-17 | 2000-12-14 | Piezoelektrischer ultraschallwandler, der ein gehäuse und eine isolierschicht umfasst |
DE50009672T DE50009672D1 (de) | 1999-12-17 | 2000-12-14 | Piezoelektrischer ultraschallwandler, der ein gehäuse und eine isolierschicht umfasst |
US10/174,058 US20020180316A1 (en) | 1999-12-17 | 2002-06-17 | Piezoelectric ultrasonic transducer comprising a housing and an insulating layer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19961095 | 1999-12-17 | ||
DE19961095.9 | 1999-12-17 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/174,058 Continuation US20020180316A1 (en) | 1999-12-17 | 2002-06-17 | Piezoelectric ultrasonic transducer comprising a housing and an insulating layer |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001045081A1 true WO2001045081A1 (de) | 2001-06-21 |
Family
ID=7933162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/004455 WO2001045081A1 (de) | 1999-12-17 | 2000-12-14 | Piezoelektrischer ultraschallwandler umfassend ein gehäuse und eine isolierschicht |
Country Status (4)
Country | Link |
---|---|
US (1) | US20020180316A1 (de) |
EP (1) | EP1238388B1 (de) |
DE (1) | DE50009672D1 (de) |
WO (1) | WO2001045081A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
DE102021107559A1 (de) | 2021-03-25 | 2022-09-29 | Endress+Hauser Conducta Gmbh+Co. Kg | Verfahren zur Qualitätsprüfung von Ultraschallwandlern |
Families Citing this family (10)
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 |
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. |
DE102008055123B3 (de) * | 2008-12-23 | 2010-07-22 | Robert Bosch Gmbh | Ultraschallwandler zum Einsatz in einem fluiden Medium |
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 |
Citations (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 |
EP0594331A1 (de) * | 1992-10-19 | 1994-04-27 | Oki Ceramic Industry Co., Ltd. | Piezoelektrischer Sensor |
EP0749005A2 (de) * | 1995-06-12 | 1996-12-18 | Siemens Aktiengesellschaft | Schallwandler |
EP0815954A2 (de) * | 1996-07-04 | 1998-01-07 | Siemens Aktiengesellschaft | Schallwandler, insbesondere Ultraschallwandler |
-
2000
- 2000-12-14 EP EP00991061A patent/EP1238388B1/de not_active Expired - Lifetime
- 2000-12-14 DE DE50009672T patent/DE50009672D1/de not_active Expired - Fee Related
- 2000-12-14 WO PCT/DE2000/004455 patent/WO2001045081A1/de active IP Right Grant
-
2002
- 2002-06-17 US US10/174,058 patent/US20020180316A1/en not_active Abandoned
Patent Citations (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 |
EP0594331A1 (de) * | 1992-10-19 | 1994-04-27 | Oki Ceramic Industry Co., Ltd. | Piezoelektrischer Sensor |
EP0749005A2 (de) * | 1995-06-12 | 1996-12-18 | Siemens Aktiengesellschaft | Schallwandler |
EP0815954A2 (de) * | 1996-07-04 | 1998-01-07 | Siemens Aktiengesellschaft | Schallwandler, insbesondere Ultraschallwandler |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
DE102021107559A1 (de) | 2021-03-25 | 2022-09-29 | Endress+Hauser Conducta Gmbh+Co. Kg | Verfahren zur Qualitätsprüfung von Ultraschallwandlern |
Also Published As
Publication number | Publication date |
---|---|
EP1238388B1 (de) | 2005-03-02 |
EP1238388A1 (de) | 2002-09-11 |
US20020180316A1 (en) | 2002-12-05 |
DE50009672D1 (de) | 2005-04-07 |
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