WO2009144153A1 - Piezoelektrische sensoreinrichtung - Google Patents
Piezoelektrische sensoreinrichtung Download PDFInfo
- Publication number
- WO2009144153A1 WO2009144153A1 PCT/EP2009/056044 EP2009056044W WO2009144153A1 WO 2009144153 A1 WO2009144153 A1 WO 2009144153A1 EP 2009056044 W EP2009056044 W EP 2009056044W WO 2009144153 A1 WO2009144153 A1 WO 2009144153A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- sensor device
- adapter sleeve
- holder
- resonator element
- 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.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
- G01G3/13—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing having piezoelectric or piezoresistive properties
Definitions
- the invention relates to a piezoelectric sensor device for a microbalance application with a sensor housing, which accommodates a sensor holder for a substantially strip-shaped, piezoelectric resonator element, wherein the measuring range of the resonator element projects into a fluid flow to be measured.
- piezoelectric sensor devices for example for measuring the contents of an exhaust gas sample, have piezoelectric resonator elements with a circular cross-section, which are held in a special high-temperature holder for round crystal elements.
- a simple change of the fluid elements acted upon by the crystal elements is not possible with such holders.
- the round crystal design requires a relatively space-consuming design (see, for example, EP 1 316 796 A1).
- An improvement is the embodiment according to DE 10 2007 047 628 A1, which shows a piezoelectric sensor device in a microbalance application, in which a holder for receiving a strip-shaped, piezoelectric resonator element is provided in a sensor housing.
- the resonator element is held on one side in a clamping holder, wherein the free measuring range protrudes into the fluid flow to be measured.
- the high-temperature resistant holder has a clamping element consisting of a first, elastic arm and a second, inelastic arm, between which arms an exemption is formed, which serves to receive the piezoelectric resonator element.
- the two arms are arranged on a substantially circular base plate, wherein the entire arrangement consists of a machinable glass ceramic.
- the two arms of the clamping element serve both for electrical contacting and for stabilizing the resonator element, whereby the clamping function remains fulfilled even with temperature changes due to the spring effect of the first arm.
- the holder has an electrically conductive coating, wherein the coating regions of the two arms are electrically separated from each other and each connected to an electrical connection in the base plate.
- a disadvantage is the fact that when the resonator element is changed, its sensitive surface must be detected, with the thin, electrically conductive layers of the resonator element or the coatings on the two arms of the clamping element being damaged by the mechanical stress during removal or insertion of the clamping element Resonator element damaged can be.
- Another disadvantage is the relatively complicated production of the clamp.
- Unilaterally held piezoelectric sensor elements are also known from other areas of metrology, which, however, can not be used directly for microbalance applications. These are, for example, piezoelectric sensor devices whose sensor element is bent by acceleration forces or by a gas flow, so that a voltage change can be measured.
- a measuring apparatus is known from US 2005/150 305 A1, which shows a sensor rod clamped on one side, which emits a signal proportional to the load during a mechanical load.
- the piezoresistive effect is used in conjunction with a measuring bridge.
- the object of the invention is to avoid the disadvantages of the sensor devices described above and to allow a rapid, unproblematic changing of the piezoelectric resonator element. Furthermore, the sensor holder should be as easy to produce as possible.
- the piezoelectric resonator element is cast in the contact region of its electrical connection lines in a plastic body forming the sensor holder, which is arranged exchangeably in the sensor housing.
- the resonator element is not present in the invention as a single element, but is poured in the field of electrical connection lines in a high-temperature epoxy, which molding compound forms the sensor holder, which is not poured into the sensor housing and thus can be replaced freely.
- the sensor holder is a substantially cylindrical body and has at the end facing away from the piezoelectric resonator element on an RF connector part which is cast together with the electrical connection lines in the plastic body.
- a handy component for example made of electrically insulating epoxy resin, from which the front side of the measuring range of the resonator protrudes and which has an RF jack at the opposite end.
- This easy-to-produce component can be easily removed and installed in the sensor housing without touching sensitive measuring surfaces must and without critical contact points between the resonator element and connecting cables are mechanically stressed.
- the sensor housing has an adapter sleeve, the head part of which comprises the sensor holder and has a passage opening for the piezoelectric resonator element, wherein a shaft part of the adapter sleeve can be screwed to a base part of the sensor housing which has a signal plug contacted by the connection lines, preferably a BNC connector.
- a bearing on the sensor holder spacer element is arranged, which rests on a shoulder in the base part and presses the sensor holder sealingly to the head part of the adapter sleeve when screwing the base part with the adapter sleeve.
- FIG. 1 shows the piezoelectric sensor device in a longitudinal section.
- FIG. 2 shows the sensor holder of the sensor device according to FIG. 1, including resonator element and HF plug connection in detail;
- FIG. 3 shows a longitudinal section of the adapter sleeve of the sensor device according to FIG. 1;
- FIG. 5 shows the spacer element of the sensor device according to FIG. 1 in a longitudinal section normal to the sectional illustration according to FIG. 1;
- FIG. 6 shows the sensor device in a typical installation situation in a sectional view
- Fig. 7 shows a two-part mold for producing the sensor holder.
- the piezoelectric sensor device 1 shown in FIGS. 1 to 6 has a two-part sensor housing 2 made of metal, which consists of an adapter sleeve 3 and a base part 4 screwed to the adapter sleeve 3.
- a sensor holder 6 for example made of an epoxy resin or other suitable plastic, in which the contact region 7 of the piezoelectric resonator 8, the electrical connection lines 9, and an RF connector part 10 (eg, a coaxial socket SMP SM Rosenberger) are poured.
- a two-component epoxy resin (Aremco-Bond 805, Karger GmbH Industrie area, DE) with polyamide, or amine as hardener, aluminum as filler and a temperature resistance up to 300 ° C. is used.
- the head part 5 of the adapter sleeve 3 has a passage opening 17 for the piezoelectric resonator element 8.
- the base part 4 of the sensor housing 2 accommodates a signal connector 12, preferably a BNC connector, which is connected to a connecting line 18 leading to the sensor holder 6 or its RF connector part 10 with an RF connector part 19 (eg coaxial mini-SMP connector Rosenberger ) connected.
- a signal connector 12 preferably a BNC connector
- RF connector part 19 eg coaxial mini-SMP connector Rosenberger
- the sensor holder 6 In the shaft portion of the adapter sleeve 3 is a on the sensor holder 6 ab rotates spacer element 13 which abuts a shoulder 14 in the base part 4 and presses the sensor holder 6 from the inside sealingly to the head part 5 of the adapter sleeve 3 when screwing the base part 4 with the adapter sleeve 3 ,
- the sensor holder 6, the front side - for example in an annular shoulder - - have a seal 20, preferably an O-ring seal, which produces a sealing fit to the head part 5 of the adapter sleeve 3.
- the spacer element 13 is substantially tubular, receives in the interior the electrical connection line 18 to the piezoelectric resonator element 8 (see FIG. 1) and has at least one lateral wall recess 15. This is helpful in loosening and connecting the RF connector parts 10, 19.
- FIG. 6 shows a typical measurement situation in which the sensor device 1 with the head part 5 of the adapter sleeve 3 is inserted into the measuring bore 24 of a welding nipple 25 welded into a pipe wall 26.
- the shaft part of the adapter sleeve 3 has a sealing surface 16, which cooperates in the installed state of the sensor device 1 with the clamping ring 27 of a clamping ring seal sealingly.
- the measuring region 11 of the resonator element 8 protrudes through an opening 28 in the tube wall 26 into the fluid to be measured and may have different coatings depending on the desired measurement requirement, so that, for example, a humidity sensor or a sensor for measuring the contents of an exhaust gas sample can be realized.
- Fig. 7 shows two substantially mirror-symmetrical mold halves 21 21 'made of metal, which are joined together with dowel pins and screws, which are inserted into the bores 22, into a mold. In one of the two mold halves 21, the resonator 8 and the RF connector part 10 is inserted together with soldered leads 9, closed the mold and poured with the aid of the casting channels 23 with an epoxy resin.
- the mold halves 21, 21 ' have an open position in the measuring area 11 of the resonator element 8, so that the measuring area 11 projects freely into the space between the mold halves when the mold is closed. After curing of the epoxy resin, a compact component according to FIG. 2 is produced.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE112009001376T DE112009001376A5 (de) | 2008-05-29 | 2009-05-19 | Piezoelektrische Sensoreinrichtung |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT8672008A AT504958B1 (de) | 2008-05-29 | 2008-05-29 | Piezoelektrische sensoreinrichtung |
| ATA867/2008 | 2008-05-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009144153A1 true WO2009144153A1 (de) | 2009-12-03 |
Family
ID=39735830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2009/056044 Ceased WO2009144153A1 (de) | 2008-05-29 | 2009-05-19 | Piezoelektrische sensoreinrichtung |
Country Status (3)
| Country | Link |
|---|---|
| AT (1) | AT504958B1 (de) |
| DE (1) | DE112009001376A5 (de) |
| WO (1) | WO2009144153A1 (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10302474B2 (en) | 2017-08-09 | 2019-05-28 | Georg Fischer Signet Llc | Insertion ultrasonic sensor assembly |
| US10620060B2 (en) | 2017-07-19 | 2020-04-14 | Georg Fischer Signet, LLC | Combined ultrasonic temperature and conductivity sensor assembly |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3269474A (en) * | 1960-08-30 | 1966-08-30 | Sensonics Inc | Piezoelectric weighing device |
| WO1999008330A1 (de) * | 1997-08-05 | 1999-02-18 | Siemens Aktiengesellschaft | Vorgespannter piezoelektrischer aktor |
| US20040187580A1 (en) * | 2003-03-28 | 2004-09-30 | Citizen Watch Co., Ltd. | QCM sensor and QCM sensor device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT413245B (de) * | 2001-11-26 | 2005-12-15 | Avl List Gmbh | Vorrichtung und verfahren zur bestimmung des nichtflüchtigen anteils von aerosolpartikeln in einer gasprobe |
| US4312228A (en) * | 1979-07-30 | 1982-01-26 | Henry Wohltjen | Methods of detection with surface acoustic wave and apparati therefor |
| US5208162A (en) * | 1990-05-08 | 1993-05-04 | Purafil, Inc. | Method and apparatus for monitoring corrosion |
| DE4334834A1 (de) * | 1993-10-13 | 1995-04-20 | Andrzej Dr Ing Grzegorzewski | Biosensor zum Messen von Viskositäts- und/oder Dichteänderungen |
| EP0768532B1 (de) * | 1995-10-09 | 2003-04-23 | Matsushita Electric Industrial Co., Ltd | Beschleunigungssensor und Herstellungsverfahren hierfür, sowie Schockdetektor, der einen solchen Sensor verwendet |
| JP3700559B2 (ja) * | 1999-12-16 | 2005-09-28 | 株式会社村田製作所 | 圧電音響部品およびその製造方法 |
| AU8397701A (en) * | 2000-08-08 | 2002-02-18 | Smithkline Beecham Plc | Novel device |
| AT409799B (de) * | 2001-04-18 | 2002-11-25 | Avl List Gmbh | Verfahren zur messung von aerosolteilchen in gasförmigen proben |
| US7475607B2 (en) * | 2004-01-08 | 2009-01-13 | Honeywell International Inc. | Sensing apparatus with an integrated gasket on a beam component |
| AT502125B1 (de) * | 2006-10-09 | 2008-05-15 | Avl List Gmbh | Piezoelektrische sensoreinrichtung |
-
2008
- 2008-05-29 AT AT8672008A patent/AT504958B1/de not_active IP Right Cessation
-
2009
- 2009-05-19 DE DE112009001376T patent/DE112009001376A5/de not_active Withdrawn
- 2009-05-19 WO PCT/EP2009/056044 patent/WO2009144153A1/de not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3269474A (en) * | 1960-08-30 | 1966-08-30 | Sensonics Inc | Piezoelectric weighing device |
| WO1999008330A1 (de) * | 1997-08-05 | 1999-02-18 | Siemens Aktiengesellschaft | Vorgespannter piezoelektrischer aktor |
| US20040187580A1 (en) * | 2003-03-28 | 2004-09-30 | Citizen Watch Co., Ltd. | QCM sensor and QCM sensor device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10620060B2 (en) | 2017-07-19 | 2020-04-14 | Georg Fischer Signet, LLC | Combined ultrasonic temperature and conductivity sensor assembly |
| US10302474B2 (en) | 2017-08-09 | 2019-05-28 | Georg Fischer Signet Llc | Insertion ultrasonic sensor assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| AT504958A3 (de) | 2009-04-15 |
| AT504958B1 (de) | 2009-08-15 |
| AT504958A2 (de) | 2008-09-15 |
| DE112009001376A5 (de) | 2011-04-21 |
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