EP2316005A1 - Sensor in mikromechanischer bauweise - Google Patents
Sensor in mikromechanischer bauweiseInfo
- Publication number
- EP2316005A1 EP2316005A1 EP09781170A EP09781170A EP2316005A1 EP 2316005 A1 EP2316005 A1 EP 2316005A1 EP 09781170 A EP09781170 A EP 09781170A EP 09781170 A EP09781170 A EP 09781170A EP 2316005 A1 EP2316005 A1 EP 2316005A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vibration
- measuring
- measuring tube
- transducer
- damping device
- 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.)
- Withdrawn
Links
- 238000013016 damping Methods 0.000 claims description 35
- 230000010355 oscillation Effects 0.000 claims description 17
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 238000005516 engineering process Methods 0.000 claims description 3
- 230000003534 oscillatory effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 10
- 239000007788 liquid Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 239000000758 substrate Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 230000005520 electrodynamics Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000005297 pyrex Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/844—Coriolis or gyroscopic mass flowmeters constructional details microfluidic or miniaturised flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8422—Coriolis or gyroscopic mass flowmeters constructional details exciters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8427—Coriolis or gyroscopic mass flowmeters constructional details detectors
Definitions
- the invention relates to a vibration-type transducer for measuring a mass flow of a flowing medium.
- measurement devices are often used, in particular as Coriolis mass flow meters, which induce Coriolis forces in the flowing medium by means of a transducer of the vibration type and an operating and evaluation electronics connected thereto and generate a measurement signal derived from these.
- Such measuring devices with a transducer of the vibration type have long been known and have become equally established in industrial use.
- Straight measuring tubes cause Coriolis forces in the medium flowing through them when they are excited to bending oscillations according to a first mode of natural vibration, the so-called drive or payload mode.
- the Coriolis forces lead in turn, that coplanar bending oscillations are superimposed on the excited bending oscillations according to a second natural vibration mode of higher and / or lower order, the so-called Coriolis mode, and accordingly the vibrations detected on the inlet side and outlet side by means of the sensor arrangement have a measurable phase difference which is also dependent on the mass flow exhibit.
- the measuring tubes of such measuring transducers which are used in particular in Corioiis mass flow meters, are excited in the payload mode at a momentary resonance frequency of the first natural vibration modes, in particular at a constantly controlled oscillation amplitude. Since this resonance frequency is also dependent on the instantaneous density of the medium, the density of flowing media can be measured directly by means of commercially available Coriolis mass flowmeters in addition to the mass flow rate.
- the vaporizing type transducers known in the art often have a minimum diameter of the tubing of 1mm when very low flow rates are to be measured.
- the object of the invention is achieved by a Vi b ratio nstyp for measuring a mass flow of a flowing medium in that two straight measuring tubes are provided for guiding the medium, the measuring tubes are arranged parallel to each other and the transducer is designed in micromechanical design.
- the vibration-type transducer for measuring a mass flow of a flowing medium, such as a liquid or a gas, which allows a reliable measurement of a very low mass flow.
- the vibration-type transducer according to the invention can have a free lumen of the two measuring tubes in the range of a few ⁇ m 2 .
- the vibration type transducer of the present invention is producible on a silicon substrate or a glass substrate in a micro-electro-mechanical system (MEMS) imparting method such as polyimps or microcomputers.
- MEMS micro-electro-mechanical system
- the measuring tubes are brought together at their respective one ends and at their respective other ends in a coupling piece and connected to a pipeline.
- the couplings may be etched into the wafer or made by anodic bonding.
- the measuring tubes are mounted swingably on the two coupling pieces.
- the spring constant of the oscillatable measuring tube can be influenced by the cross section of the measuring tube. This means in particular that by a Increasing the cross-section of the measuring tube, the spring constant of the oscillating measuring tube is increased.
- the coupling piece is designed as a reservoir.
- the coupling piece is designed both as a reservoir both at the one end of the measuring tubes and at the other end of the measuring tubes.
- An embodiment of the coupling piece as a reservoir is particularly advantageous since a thermal expansion, in particular due to a temperature gradient in the transducer, can be reduced in order to reduce a stress caused by the thermal expansion in the measuring tubes.
- a vibration exciter is provided, wherein the vibration exciter is arranged centrally on the measuring tube and designed such that the measuring tube is displaceable in lateral oscillations.
- two vibration exciters are provided, wherein the first vibration exciter is arranged centrally on the first measuring tube and the second vibration exciter is arranged centrally on the second measuring tube such that the first vibration exciter is arranged on one side of the measuring tubes and the second vibration exciter the other side of the measuring tubes is arranged, wherein the two vibration exciter and the two measuring tubes are arranged in a plane.
- the lateral oscillations of the first measuring tube which can be set into oscillation by the first oscillation exciter, are in antiphase to the lateral oscillations of the second measuring tube, which can be set into oscillation by the second oscillation exciter.
- the vibration exciter as an electrostatic comb drive.
- the amplitude of the lateral vibrations can be increased by increasing the number of tines of the comb drive or by increasing the number of tines on the electrostatic drive. see comb drive increase applied voltage.
- a sinusoidal voltage is preferably applied to the vibration exciter, so that the measuring tubes oscillate in their resonant frequency and oscillate in opposite phase in order to obtain a balanced system .
- the vibration generator can also be designed as a piezoelectric drive.
- a connecting device attached to and connecting the two measuring tubes for determining the oscillatory length of the measuring tubes and to arrange the connecting device in an end region of the measuring tubes. It is particularly preferred to arrange a first connecting device in an end region of the measuring tubes and to arrange a second connecting device in another end region of the measuring tubes.
- a damping device is provided for influencing the rigidity of the measuring tube.
- a damping device is also advantageous during transport of the transducer, as a possible damage to the measuring tubes can be avoided.
- a first damping device is connected to a first measuring tube and a second damping device connected to a second measuring tube such that the two measuring tubes, the first damping device and the second damping device are arranged in a plane, wherein the measuring tubes between the first damping device and the second damping device are arranged.
- the damping device is provided in the central region of the measuring tube, that a first part of the damping device is arranged on one side of the vibration exciter on the measuring tube and a second part of the damping device on the other side of the vibration exciter at the Measuring tube is arranged.
- a damping device is provided, which is preferably arranged centrally on the measuring tube, wherein a first part of the damping device and a second part of the damping device are arranged symmetrically about the also preferably arranged centrally on the measuring tube vibration exciter.
- the first part of the damping device, the second part of the damping device, the measuring tube and the vibration generator are arranged in a plane.
- the damping device which is preferably designed as a first part of the damping device and as a second part of the damping device, can be designed as desired. According to a preferred embodiment of the invention, however, it is provided that the first part of the damping device and the second part of the damping device each comprise two spaced apart parallel plates, wherein the plates are connected at one end to the measuring tube, that the plates parallel to the Measuring tube are arranged, and wherein the plates are connected at another end with a vibration-proof to the measuring tube arranged region.
- the first part of the damping device and the second part of the damping device are preferably formed as two spaced apart parallel leaf springs, wherein the leaf springs are connected at one end to the measuring tube such that the leaf springs are arranged parallel to the measuring tube, and the leaf springs are connected at the other end with a vibration-resistant to the measuring tube arranged region, such as the silicon substrate.
- the rigidity of the measuring tubes which are arranged vibrationally and can be displaced by the vibration exciter in lateral vibrations, can be varied.
- an arbitrarily executed vibration sensor can be provided.
- at least one vibration transducer is provided, which is designed as a comb structure with a capacitive sensor.
- a first vibration sensor and a second vibration sensor are provided, wherein the first vibration sensor is preferably arranged in a central region between the one end of the measuring tube and the vibration exciter, and the second vibration sensor between the vibration generator and the vibration sensor the other end of the measuring tube is arranged on the measuring tube.
- the number of tines of the comb structure of the vibration sensor can be increased.
- An improvement in the signal-to-noise ratio can also be achieved by increasing the length of the measuring tube, thereby also increasing the distance between the first vibration sensor and the second vibration sensor.
- a recess is provided below the measuring tube to a lateral guidance of the measuring tube.
- the recess is provided below the measuring tube in the central region of the measuring tube.
- the transducer is manufactured in PolyMUMPS technology.
- a structural layer of the measuring tube is made of polyI, wherein two poly-poly-via-layers, which form the side walls of the measuring tube, are provided on the poly-layer.
- a poly2 layer preferably forms the ceiling of the measuring tube, with an oxide-2 layer being removed by an etching step to form the channel of the measuring tube.
- FIG. 1 shows a vibration-type transducer according to a preferred embodiment of the invention in a perspective plan view
- FIG. 2 shows two measuring tubes according to the preferred embodiment of the invention in a sectional view.
- the vibration-type transducer 1 has two straight measuring tubes 2, two vibration exciters 3 and four vibration pickups 4.
- the vibration type 1 transducer is made using PolyMUMPS technology, with the length of the measuring tube 2 being 660 ⁇ m.
- the two measuring tubes 2 are each brought together at their respective one ends and at their respective other ends in a coupling piece 5 and connected to a pipeline, not shown.
- the measuring tubes 2 are mounted swingably on the two coupling pieces 5.
- the measuring tubes 2 can be produced in a wafer bonding method, wherein an anodic bonding method is used to produce the coupling pieces 5, that is to say a connection of the measuring tubes 2 to the pipeline.
- the inputs and outputs of the measuring tubes 2 can be realized by means of an etching process.
- the transition to the pipeline can be realized by means of Pyrex 7740 Gias connections, which are bonded to a silicon substrate of the measuring tubes 2 at a voltage of 500 V to 1000 V and a temperature of 26O 0 C to 400 0 C.
- the coupling pieces 5 are designed as a reservoir, so that a thermal expansion of the measuring tubes 2, in particular by a temperature gradient in the vibrating type measuring vibrator 1, can be compensated.
- two vibration exciters 3 are provided, which are designed as electrostatic comb drives.
- a sinusoidal voltage is applied to the electrostatic comb drives, so that the measuring tubes 2 oscillate on the one hand in their resonant frequency and on the other hand oscillate out of phase in order to obtain a balanced sys- tem.
- a first vibration exciter 3 is arranged on one side of the measuring tubes 2 and a second vibration exciter 3 on the other side of the measuring tubes 2 such that the measuring tubes 2, the first vibration exciter 3 and the second vibration exciter 3 in FIG lie on a plane.
- a damping device 6 is provided for influencing the rigidity of the measuring tube 2.
- the damping device 6 is arranged in the middle region of the measuring tube 2, wherein a first part of the damping device 7 is arranged on one side of the vibration generator 3 and a second part of the damping device 8 is arranged on the other side of the vibration generator 3.
- the first part of the damping device 7 and the second part of the damping device 8 essentially comprise two mutually spaced parallel leaf springs 9, which are arranged parallel to the measuring tube 2, so that the spaced apart parallel leaf springs 9 are connected at one end to the measuring tube 2 and are connected at another end with a vibration-proof arranged to the measuring tube 2 area.
- the vibrating-type transducer 1 further comprises four vibration pickups 4, each of which is implemented as a comb structure with a capacitive sensor. As can be seen from FIG. 1, the vibration sensors 4 are each arranged in a middle region between the vibration generator 3 and the end of the measuring tubes 2.
- connecting devices 10 each fastened to and connected to both measuring tubes 2 for determining the oscillatory length the measuring tubes 2 are provided, wherein the connecting means 10 are arranged in an end region of the measuring tubes 2.
- the vibrating transducer has two symmetry planes. It goes without saying that in each case one vibration exciter and one vibration transducer each in the inlet and in the outlet region are sufficient to be sufficient for the transducer.
- the dual design ensures redundancy both in terms of measurement accuracy and in terms of ensuring the correct functioning of the transducer in the event of failure of one of the two vibration exciters or one of the two vibration sensors.
- the measuring tube 2 has a bottom layer, which is made of a polyimide layer 11.
- two poly-poly 2 via layers 12 are arranged, which form the side walls of the measuring tube 2.
- the lid of the measuring tube 2 is formed by a Poiy2 layer 13.
- An oxide 2 layer 14 is provided for forming a channel of the measuring tube 2, wherein the oxide 2 layer 14 is etched away by a later manufacturing step of the polyMUMPS manufacturing process.
- the PoIyI layer 11, which forms the bottom layer of the measuring tube 2 is 27 microns wide, 660 microns long and has a thickness of 2 microns.
- the height of the poly-poly 2 via layer 12 is 0.75 ⁇ m, as is the height of the oxide 2 layer 14.
- the height of the poly 2 layer 13 is 1.5 ⁇ m.
- the measuring tubes 2 are vibrated by means of the vibration exciter 3 by applying a sinusoidal voltage in their resonant frequency.
- the lateral displacement of the measuring tubes 2 is by the sensor 4 measured, wherein the mass flow rate by measuring a phase difference between the sinusoidal voltages which are measured at a first vibration sensor 4 and a second vibration sensor 4, wherein the first vibration sensor 4 is provided in an upper region of the measuring tube 2 and the second vibration sensor 4 in a lower portion of the measuring tube 2 is provided.
- the length of the measuring tube 2 can be increased so as to increase the distance between the first vibration sensor 4 and the second vibration sensor 4. Furthermore, by increasing the width of the channel of the measuring tube 2, the oscillation constant of the lateral oscillation of the measuring tube 2 can be increased.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008039045A DE102008039045A1 (de) | 2008-08-21 | 2008-08-21 | Sensor in mikromechanischer Bauweise |
| PCT/EP2009/059721 WO2010020525A1 (de) | 2008-08-21 | 2009-07-28 | Sensor in mikromechanischer bauweise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2316005A1 true EP2316005A1 (de) | 2011-05-04 |
Family
ID=41279414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09781170A Withdrawn EP2316005A1 (de) | 2008-08-21 | 2009-07-28 | Sensor in mikromechanischer bauweise |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US8336395B2 (de) |
| EP (1) | EP2316005A1 (de) |
| DE (1) | DE102008039045A1 (de) |
| WO (1) | WO2010020525A1 (de) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012109729A1 (de) | 2012-10-12 | 2014-05-15 | Endress + Hauser Flowtec Ag | Meßsystem zum Ermitteln eines Volumendruchflusses und/oder einer Volumendurchflußrate eines in einer Rohrleitung strömenden Mediums |
| WO2014056709A1 (de) | 2012-10-11 | 2014-04-17 | Endress+Hauser Flowtec Ag | Messsystem zum ermitteln eines volumendurchflusses und/oder einer volumendurchflussrate eines in einer rohrleitung strömenden mediums |
| US9151652B2 (en) * | 2013-09-20 | 2015-10-06 | Teledyne Instruments, Inc. | Coriolis flow sensor fabricated with laminated films processes |
| DE102014105580A1 (de) | 2014-04-17 | 2015-10-22 | Krohne Ag | Coriolis-Massedurchflussmessgerät |
| DE102015110711A1 (de) | 2015-07-02 | 2017-01-05 | Endress+Hauser Flowtec Ag | MEMS Sensor zu Messung mindestens einer Messgröße eines strömenden Fluids |
| DE102015118232B4 (de) | 2015-10-26 | 2023-09-14 | Truedyne Sensors AG | System und Verfahren zum Überwachen eines Kanals, insbesondere eines MEMS-Kanals |
| DE102015118346A1 (de) | 2015-10-27 | 2017-04-27 | Endress+Hauser Flowtec Ag | MEMS Sensor zu Messung mindestens einer Messgröße |
| DE102015118347A1 (de) | 2015-10-27 | 2017-04-27 | Endress+Hauser Flowtec Ag | Messaufnehmer mit einer zu Schwingungen anregbaren Messleitung |
| DE102016101600A1 (de) | 2016-01-29 | 2017-08-03 | Truedyne Sensors AG | MEMS-Sensor mit Funktionsüberprüfung |
| DE102016108964B4 (de) | 2016-05-13 | 2019-03-28 | Truedyne Sensors AG | Vorrichtung und Verfahren zur Bestimmung des Stoffmengenanteils von Gaskomponenten einer diskreten Probe eines mehrkomponentigen Gasgemischs |
| DE102021122031A1 (de) | 2021-08-25 | 2023-03-02 | Endress + Hauser Flowtec Ag | Vibronischer Messaufnehmer |
| DE102021122030A1 (de) | 2021-08-25 | 2023-03-02 | Endress + Hauser Flowtec Ag | Vibronischer Messaufnehmer |
Family Cites Families (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3443234A1 (de) | 1984-11-27 | 1986-06-05 | Danfoss A/S, Nordborg | Massendurchfluss-messgeraet nach dem coriolis-prinzip |
| US4768385A (en) | 1986-08-13 | 1988-09-06 | Micro Motion, Inc. | Parallel path Coriolis mass flow meter |
| GB8809715D0 (en) * | 1988-04-25 | 1988-06-02 | Pa Consulting Services | Fluid mass flow & density sensor |
| US5796011A (en) * | 1993-07-20 | 1998-08-18 | Endress + Hauser Flowtech Ag | Coriolis-type mass flow sensor |
| DE19719587A1 (de) * | 1997-05-09 | 1998-11-19 | Bailey Fischer & Porter Gmbh | Verfahren und Einrichtung zur Erkennung und Kompensation von Nullpunkteinflüssen auf Coriolis-Massedurchflußmesser |
| EP0986739A1 (de) * | 1998-04-03 | 2000-03-22 | Endress + Hauser Flowtec AG | Verfahren zum massedurchfluss-messen und entsprechende aufnehmer |
| US6748813B1 (en) * | 1998-12-08 | 2004-06-15 | Emerson Electric Company | Coriolis mass flow controller |
| WO2001013074A1 (en) * | 1999-08-17 | 2001-02-22 | Fmc Corporation | Dynamic counterbalance system for coriolis mass flowmeters |
| US6477901B1 (en) * | 1999-12-21 | 2002-11-12 | Integrated Sensing Systems, Inc. | Micromachined fluidic apparatus |
| EP1253409A1 (de) * | 2001-04-26 | 2002-10-30 | Endress + Hauser Flowtec AG | Magnetkreisanordnung für einen Messwertaufnehmer |
| US6647778B2 (en) * | 2001-06-20 | 2003-11-18 | Integrated Sensing Systems | Integrated microtube sensing device |
| US6718823B2 (en) * | 2002-04-30 | 2004-04-13 | Honeywell International Inc. | Pulse width modulation drive signal for a MEMS gyroscope |
| US7059176B2 (en) * | 2003-06-18 | 2006-06-13 | Integrated Sensing Systems, Inc. | Resonant tube viscosity sensing device |
| US20050284815A1 (en) * | 2004-06-28 | 2005-12-29 | Integrated Sensing Systems, Inc. | Medical treatment system and method |
| US7437912B2 (en) * | 2004-07-19 | 2008-10-21 | Integrated Sensing Systems, Inc. | Device and method for sensing rheological properties of a fluid |
| US7381628B2 (en) * | 2004-08-20 | 2008-06-03 | Integrated Sensing Systems, Inc. | Process of making a microtube and microfluidic devices formed therewith |
| US7351603B2 (en) * | 2004-08-20 | 2008-04-01 | Integrated Sensing Systems, Inc. | Process of making a microtube and microfluidic devices formed therewith |
| US7228735B2 (en) * | 2005-02-03 | 2007-06-12 | Integrated Sensing Systems, Inc. | Fluid sensing device with integrated bypass and process therefor |
| US7360452B2 (en) * | 2005-12-27 | 2008-04-22 | Endress + Hauser Flowtec Ag | In-line measuring devices and method for compensation measurement errors in in-line measuring devices |
| US7568399B2 (en) * | 2006-01-05 | 2009-08-04 | Integrated Sensing Systems, Inc. | Microfluidic device |
| US7581429B2 (en) * | 2006-01-06 | 2009-09-01 | Integrated Sensing Systems, Inc. | Microfluidic device and method of operation |
| DE102006029443B3 (de) * | 2006-06-21 | 2008-01-31 | Siemens Ag | Sensor in mikromechanischer Bauweise zum Messen des Massendurchflusses nach dem Coriolis-Prinzip |
| DK2118623T3 (en) * | 2006-12-22 | 2017-01-30 | Endress & Hauser Flowtec Ag | Transducer af vibrationstypen |
-
2008
- 2008-08-21 DE DE102008039045A patent/DE102008039045A1/de not_active Withdrawn
-
2009
- 2009-07-28 WO PCT/EP2009/059721 patent/WO2010020525A1/de not_active Ceased
- 2009-07-28 EP EP09781170A patent/EP2316005A1/de not_active Withdrawn
- 2009-08-11 US US12/461,404 patent/US8336395B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010020525A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102008039045A1 (de) | 2010-02-25 |
| US20100043569A1 (en) | 2010-02-25 |
| WO2010020525A1 (de) | 2010-02-25 |
| US8336395B2 (en) | 2012-12-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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