WO2002084226A1 - Sensorchip mit potentialflächen bzw. verwendung von potentialflächen auf einem sensorchip bzw. verfahren zur vermeidung von verschmutzungen auf einem sensorchip - Google Patents
Sensorchip mit potentialflächen bzw. verwendung von potentialflächen auf einem sensorchip bzw. verfahren zur vermeidung von verschmutzungen auf einem sensorchip Download PDFInfo
- Publication number
- WO2002084226A1 WO2002084226A1 PCT/DE2002/001424 DE0201424W WO02084226A1 WO 2002084226 A1 WO2002084226 A1 WO 2002084226A1 DE 0201424 W DE0201424 W DE 0201424W WO 02084226 A1 WO02084226 A1 WO 02084226A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- area
- sensor chip
- potential
- chip according
- Prior art date
Links
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
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
-
- 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
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
- G01F1/6845—Micromachined devices
Definitions
- the invention is based on a sensor chip with potential areas or on the use of a potential area on a sensor chip or on a method for avoiding contamination on a sensor chip according to the preamble of claim 1 or 13 or 14 or 15.
- a sensor chip with a sensor area which, for example, consists of a frame element, a recess and a membrane, which forms a sensor area.
- Contamination, such as 01, to which the sensor chip is exposed can lead to an undesirable influence on the measurement signal of the sensor chip in the area of the sensor area.
- Contamination of the sensor area or in the immediate area around the sensor area with 01 changes the arm conductance on the surface of the sensor chip and thus has a falsifying effect on the measurement signal.
- the 01 deposited on the sensor chip acts as an adhesion promoter for solid particles contained in a flowing medium. These trapped particles further increase the unfavorable influence.
- US Pat. No. 5,705,745 shows a sensor chip with a membrane on which temperature and heating resistors are arranged, the membrane being surrounded by an arm guide element, which can also have a U-shape.
- the heat conducting element is not heated, i.e. it has no potential.
- US Pat. No. 4,888,988 shows a sensor chip with a membrane, a metallic conductor being arranged around the membrane. This conductor is the common neutral conductor of a measuring arrangement on the sensor chip for a measuring method.
- DE 198 01 484 AI shows a sensor chip with a membrane, electrical conductors being arranged around the membrane, through which an electric current flows. These conductor tracks are temperature sensors that are used for the
- Measuring method or the measuring process can be used.
- the sensor chip according to the invention with the potential areas or the use according to the invention of potential areas on a sensor chip or the method according to the invention for avoiding contamination on a sensor chip with the characterizing features of claims 1 or 13 or 14 or 15 has the advantage that contamination of the sensor area of the sensor chip is reduced or prevented in a simple manner.
- Downstream of the flow of the sensor area are advantageously also potential areas which protect the sensor area, for example in the event of reverse flows.
- An advantageous potential drop is achieved by a positive potential on a first potential area and a negative potential on a subsequent potential area.
- the potential areas advantageously have a U-shape, which advantageously encloses the sensor area.
- the potential areas are advantageously designed as a conductor track, since this is a known and simple manufacturing method.
- the sensor area is advantageously operated independently of the potential areas, ie the measurement or that The measurement signal that the sensor area provides is not influenced by the operation of the potential area and vice versa.
- FIG. 2a shows a first
- FIG. 2b shows a second
- FIG. 2c shows a third exemplary embodiment of a sensor chip according to the invention.
- FIG. 1 shows a sensor chip according to the prior art, which is improved according to the invention in accordance with the explanations for Figures 2a to 2c.
- the manufacturing process and the use of such a sensor chip is described in more detail in DE 196 01 791 AI, the content of which is expressly part of this disclosure.
- the sensor chip has a frame element 3, which consists, for example, of silicon.
- the frame element 3 has a recess 5.
- a dielectric layer 21, for example made of SiO 2 is applied to the frame element.
- the layer 21 can extend over the entire frame element 3, but also only over a region of the recess 5. This region forms a membrane 33 which partially or completely delimits the recess 5 on one side.
- At least one, for example three, metal tracks 19 are applied to the side of the membrane 33 facing away from the recess 5.
- the metal tracks 19 form, for example, electrical heaters and / or measuring resistors and form a sensor region 17 with the membrane 33 Sensor area 17 is preferably covered with a protective layer 23.
- the protective layer 23 can also extend only over the metal tracks 19.
- the sensor chip has a surface 27 which is in direct contact with a flowing medium.
- FIG. 2a shows a first exemplary embodiment of a sensor chip 1 designed according to the invention in a plan view.
- Metal traces for example forming at least one electrical heating resistor 35 and at least one temperature sensor 37, are arranged on the sensor region 17.
- the temperature sensor 37 is also an electrical resistor, for example.
- the metal tracks are arranged in the sensor area 17 and are a prerequisite for a measurement method for determining the at least one parameter, such as the temperature and / or flow rate, of the flowing medium.
- the sensor area 17 is therefore connected to a known control and regulating circuit, not shown.
- the sensor region 17 can be formed, for example, by the membrane 33 described above.
- the sensor chip 1 is arranged in a flowing medium for determining at least one parameter, the flowing medium flowing past or above the sensor chip 1 or the surface 27 in a main flow direction 42.
- the flowing medium can contain impurities that can lead to contamination of the sensor chip 1. These are, for example, 01 or salts dissolved in water.
- the main flow direction 42 must be in front of the sensor region 17 a first 44 and a second 47 potential area are arranged.
- the first potential area 44 has, for example, a positive potential of 1 volt, which comes, for example, from a voltage source that is independent of the control and regulating circuit.
- the second potential area 47 has no or a negative potential.
- the potential gradient can have any size and can also be reversed.
- Electrostatic fields are preferably used. Alternating fields can also be created.
- FIG. 2b shows a second exemplary embodiment of a sensor chip 1 designed in accordance with the invention.
- the sensor chip 1 additionally has a third 50 and a fourth 53 potential area in the sensor region 17 in a downstream direction.
- the first potential area 44 is, for example, at the same potential as the fourth potential area 53 and the second 47 and third 50 potential areas also have, for example the same potential. This also prevents contamination in the sensor region 17 for existing reverse flows, for example due to pulsations, which can take place against the main flow direction 42.
- the potential areas 44, 47, 50, 53 upstream and downstream of the sensor region 17 do not necessarily have to have the same potential difference.
- FIG. 2c shows a third exemplary embodiment of a sensor chip 1 designed according to the invention.
- the potential surfaces 44, 47, 50, 53 form parts of a U shape which at least partially enclose the sensor region 17.
- the second and third potential areas 47, 50 are thus connected to one another, and the first potential area 44 to the fourth potential area 53, which then form a potential area.
- the sensor chip 1 is, for example, plate-shaped and has the surface 27, past which the flowing medium flows.
- the sensor area 17 and the potential areas 44, 47, 50, 53 are arranged together on the surface 27, for example.
- the potential areas 44, 47, 50, 53 are, for example, designed such that they have a length at least upstream or downstream of the sensor region 17 which is longer than a length 1 of the sensor region 17, perpendicular to the main flow direction 42. As a result, the sensor region 17 is protected from contamination over its entire length 1.
- the resistors 35, 37 and / or the potential areas 44, 47, 50, 53 are preferably designed as conductor tracks.
- the potential areas 44, 47, 50, 53 can be arranged in whole or in part on the sensor area 17, directly adjacent to the sensor area 17 or at a distance from the sensor area 17.
- the sensor area 17 can be operated independently of the potential areas 44, 47, 50, 53, i.e. the measurement or the measurement signal that the sensor area 17 supplies is not influenced by the operation of the potential areas 44, 47, 50, 53.
- the control and regulating circuit of the sensor area 17 can send signals to the potential areas 44, 47, 50, 53 , such as apply a certain voltage or switch off a voltage, but the potential areas 44, 47, 50, 53 are not part of the measuring or controlled system of the sensor region 17.
- the magnitude of the applied voltage can be varied.
- the potential of the potential areas 44, 47, 50, 53 can also be fixed during the construction, so that no control circuit is necessary for them in order to set a certain potential, which is then fixed for the total life of the sensor chip.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002581933A JP2004518987A (ja) | 2001-04-18 | 2002-04-17 | ポテンシャルエネルギー面を備えたセンサチップおよびセンサチップ上へのポテンシャルエネルギー面の適用およびセンサチップ上の汚染回避方法 |
EP02735048A EP1281048A1 (de) | 2001-04-18 | 2002-04-17 | Sensorchip mit potentialflächen bzw. verwendung von potentialflächen auf einem sensorchip bzw. verfahren zur vermeidung von verschmutzungen auf einem sensorchip |
US10/311,404 US6854325B2 (en) | 2001-04-18 | 2002-04-17 | Sensor chip having potential surfaces for avoiding contaminant |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10118781A DE10118781B4 (de) | 2001-04-18 | 2001-04-18 | Verfahren zur Vermeidung von Verschmutzungen auf einem Sensorchip und Verwendung einer Potentialfläche auf einem Sensorchip |
DE10118781.5 | 2001-04-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002084226A1 true WO2002084226A1 (de) | 2002-10-24 |
Family
ID=7681711
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/001424 WO2002084226A1 (de) | 2001-04-18 | 2002-04-17 | Sensorchip mit potentialflächen bzw. verwendung von potentialflächen auf einem sensorchip bzw. verfahren zur vermeidung von verschmutzungen auf einem sensorchip |
Country Status (8)
Country | Link |
---|---|
US (1) | US6854325B2 (de) |
EP (1) | EP1281048A1 (de) |
JP (1) | JP2004518987A (de) |
KR (1) | KR20030011895A (de) |
CN (1) | CN1279333C (de) |
DE (1) | DE10118781B4 (de) |
RU (1) | RU2305258C2 (de) |
WO (1) | WO2002084226A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013215522A1 (de) | 2013-08-07 | 2015-02-12 | Robert Bosch Gmbh | Sensorvorrichtung zur Bestimmung wenigstens eines Parameters eines durch einen Kanal strömenden fluiden Mediums |
CN105806433A (zh) * | 2014-12-29 | 2016-07-27 | 深圳万讯自控股份有限公司 | 一种气体介质流量测量中探头除液除冰的方法及装置 |
DE102015206702A1 (de) | 2015-04-15 | 2016-10-20 | Robert Bosch Gmbh | Sensor zur Bestimmung wenigstens eines Parameters eines durch einen Kanal strömenden fluiden Mediums |
JPWO2016084664A1 (ja) * | 2014-11-28 | 2017-06-22 | 日立オートモティブシステムズ株式会社 | 熱式流量センサ |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7668667B2 (en) * | 2005-03-07 | 2010-02-23 | Microstrain, Inc. | Miniature stimulating and sensing system |
JP2008516252A (ja) | 2005-09-20 | 2008-05-15 | ビ−エイイ− システムズ パブリック リミテッド カンパニ− | センサー装置 |
US9772208B2 (en) | 2012-01-18 | 2017-09-26 | Hitachi Automotive Systems, Ltd. | Thermal type flowmeter with particle guide member |
RU2509995C1 (ru) * | 2012-07-10 | 2014-03-20 | федеральное государственное автономное образовательное учреждение высшего профессионального образования "Национальный исследовательский университет "МИЭТ" (Национальный исследовательский университет МИЭТ) | Мембранный термоанемометр |
DE102014215209A1 (de) * | 2014-08-01 | 2016-02-04 | Robert Bosch Gmbh | Sensor zur Bestimmung wenigstens eines Parameters eines durch einen Messkanal strömenden fluiden Mediums |
US9702892B1 (en) * | 2014-11-21 | 2017-07-11 | Lockheed Martin Corporation | Thermal air data (TAD) system |
EP3037791A1 (de) * | 2014-12-22 | 2016-06-29 | Sensirion AG | Durchflusssensor |
EP3421947B1 (de) | 2017-06-30 | 2019-08-07 | Sensirion AG | Betriebsverfahren für eine durchflusssensorvorrichtung |
CN110824181B (zh) * | 2019-10-18 | 2021-10-15 | 中国航空工业集团公司西安飞行自动控制研究所 | 一种低电阻敏感器件信号连接方法 |
Citations (5)
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US4888988A (en) * | 1987-12-23 | 1989-12-26 | Siemens-Bendix Automotive Electronics L.P. | Silicon based mass airflow sensor and its fabrication method |
US4947688A (en) * | 1988-08-31 | 1990-08-14 | Ricoh Company, Ltd. | Flow velocity sensor |
US5158801A (en) * | 1988-04-01 | 1992-10-27 | The United States Of America As Represented By The United States Administrator Of The National Aeronautics And Space Administration | Method of forming a multiple layer dielectric and a hot film sensor therewith |
US5705745A (en) * | 1995-07-29 | 1998-01-06 | Robert Bosch Gmbh | Mass flow sensor |
EP1031821A1 (de) * | 1999-02-26 | 2000-08-30 | Delphi Technologies, Inc. | Mikromechanisch hergestellter Massendurchflussmesser mit Umgebungstemperatursensor |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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DE2900210A1 (de) * | 1979-01-04 | 1980-07-17 | Bosch Gmbh Robert | Vorrichtung zur messung der masse eines stroemenden mediums |
DE3135793A1 (de) * | 1981-09-10 | 1983-03-24 | Robert Bosch Gmbh, 7000 Stuttgart | Verfahren und vorrichtung zur messung der masse eines in einem stroemungsquerschnitt stroemenden pulsierenden mediums |
DE4219454C2 (de) * | 1992-06-13 | 1995-09-28 | Bosch Gmbh Robert | Massenflußsensor |
CA2108539C (en) * | 1993-10-15 | 1999-01-26 | Constantinos J. Joannou | Ionizing type air cleaner |
DE19601791A1 (de) * | 1996-01-19 | 1997-07-24 | Bosch Gmbh Robert | Sensor mit einer Membran und Verfahren zur Herstellung eines Sensors mit einer Membran |
JP3366818B2 (ja) * | 1997-01-16 | 2003-01-14 | 株式会社日立製作所 | 熱式空気流量計 |
-
2001
- 2001-04-18 DE DE10118781A patent/DE10118781B4/de not_active Expired - Fee Related
-
2002
- 2002-04-17 JP JP2002581933A patent/JP2004518987A/ja active Pending
- 2002-04-17 RU RU2003100510/28A patent/RU2305258C2/ru not_active IP Right Cessation
- 2002-04-17 EP EP02735048A patent/EP1281048A1/de not_active Withdrawn
- 2002-04-17 KR KR1020027016997A patent/KR20030011895A/ko not_active Application Discontinuation
- 2002-04-17 US US10/311,404 patent/US6854325B2/en not_active Expired - Fee Related
- 2002-04-17 WO PCT/DE2002/001424 patent/WO2002084226A1/de active Application Filing
- 2002-04-17 CN CNB028012224A patent/CN1279333C/zh not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4888988A (en) * | 1987-12-23 | 1989-12-26 | Siemens-Bendix Automotive Electronics L.P. | Silicon based mass airflow sensor and its fabrication method |
US5158801A (en) * | 1988-04-01 | 1992-10-27 | The United States Of America As Represented By The United States Administrator Of The National Aeronautics And Space Administration | Method of forming a multiple layer dielectric and a hot film sensor therewith |
US4947688A (en) * | 1988-08-31 | 1990-08-14 | Ricoh Company, Ltd. | Flow velocity sensor |
US5705745A (en) * | 1995-07-29 | 1998-01-06 | Robert Bosch Gmbh | Mass flow sensor |
EP1031821A1 (de) * | 1999-02-26 | 2000-08-30 | Delphi Technologies, Inc. | Mikromechanisch hergestellter Massendurchflussmesser mit Umgebungstemperatursensor |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013215522A1 (de) | 2013-08-07 | 2015-02-12 | Robert Bosch Gmbh | Sensorvorrichtung zur Bestimmung wenigstens eines Parameters eines durch einen Kanal strömenden fluiden Mediums |
US9841305B2 (en) | 2013-08-07 | 2017-12-12 | Robert Bosch Gmbh | Sensor device for determining at least one parameter of a fluid medium flowing through a duct |
JPWO2016084664A1 (ja) * | 2014-11-28 | 2017-06-22 | 日立オートモティブシステムズ株式会社 | 熱式流量センサ |
CN105806433A (zh) * | 2014-12-29 | 2016-07-27 | 深圳万讯自控股份有限公司 | 一种气体介质流量测量中探头除液除冰的方法及装置 |
DE102015206702A1 (de) | 2015-04-15 | 2016-10-20 | Robert Bosch Gmbh | Sensor zur Bestimmung wenigstens eines Parameters eines durch einen Kanal strömenden fluiden Mediums |
Also Published As
Publication number | Publication date |
---|---|
JP2004518987A (ja) | 2004-06-24 |
DE10118781A1 (de) | 2002-10-31 |
CN1279333C (zh) | 2006-10-11 |
US20030159505A1 (en) | 2003-08-28 |
KR20030011895A (ko) | 2003-02-11 |
US6854325B2 (en) | 2005-02-15 |
EP1281048A1 (de) | 2003-02-05 |
CN1461405A (zh) | 2003-12-10 |
RU2305258C2 (ru) | 2007-08-27 |
DE10118781B4 (de) | 2005-04-21 |
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