EP3482181A1 - Differenzdrucksensor - Google Patents
DifferenzdrucksensorInfo
- Publication number
- EP3482181A1 EP3482181A1 EP17732447.2A EP17732447A EP3482181A1 EP 3482181 A1 EP3482181 A1 EP 3482181A1 EP 17732447 A EP17732447 A EP 17732447A EP 3482181 A1 EP3482181 A1 EP 3482181A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- differential pressure
- layer
- electrode
- electrically conductive
- pressure sensor
- 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
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
- G01L13/02—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements
- G01L13/025—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements using diaphragms
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0061—Electrical connection means
- G01L19/0084—Electrical connection means to the outside of the housing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/069—Protection against electromagnetic or electrostatic interferences
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0072—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance
Definitions
- the invention relates to a differential pressure sensor for determining a pressure measuring signal.
- Differential pressure sensors are used in industrial measurement technology to measure pressures. They often also include referred to as semiconductor sensors or sensor chips differential pressure measuring cells, using the from
- Such differential pressure measuring cells regularly have two basic bodies, between which a measuring diaphragm is arranged. In each case one enclosed under the measuring diaphragm pressure chamber is provided in each of the two main body. In measuring operation, one side of the measuring diaphragm is acted upon by a recess in one of the two base bodies with a first pressure and the other side of the measuring diaphragm is acted on by a recess in the second base body with a second pressure.
- Form measuring membrane pressure acting dependent capacity which can be determined by means of a to be connected to the capacitor measuring device.
- differential pressure measuring cells In order to increase the bursting strength of such differential pressure measuring cells they are usually arranged between two mechanically stable support bodies or stiffening bodies, which are each equipped with a pressure transmission line, one end of which is connected via the recess in adjacent to the respective support body with the enclosed therein pressure chamber and the other end is acted upon by a pressure supply connected thereto with one of the two pressures.
- Joining methods can be used, for example, the methods known from the prior art.
- a disadvantage of these joining methods or the joining method is that for this purpose an electrically conductive joining layer is required, which in turn leads to disadvantageous electrical effects in the evaluation of the pressure measuring signal of the differential pressure measuring cell.
- the object of the invention is to propose a differential pressure measuring cell in which the disadvantages resulting from the electrically conductive joining layer are minimized or reduced.
- Differential pressure measuring cell which a first and a second pressure can be fed and which outputs the pressure measuring signal with the aid of an electrical transducer element in response to a difference between the first and the second pressure; a first, preferably a ceramic or a semiconductor material, having stiffening body which is joined to the differential pressure measuring cell by means of a first joining layer and having a first channel, via which the first pressure of
- Differential pressure measuring cell can be fed; a second, preferably a ceramic or a semiconductor material having stiffening body, which is connected to the differential pressure measuring cell by means of a second
- Fügetik is joined and has a second channel, via which the second pressure of the differential pressure measuring cell can be fed; wherein the first and / or the second joining layer comprises an electrically conductive, preferably metallic material and the first and / or second joining layer also serves to realize an electrical functionality in addition to the mechanical connection of the differential pressure measuring cell to the first or second stiffening body.
- Differential pressure sensor has a beneficial utility giving functionality to understand.
- electrical functionalities may be the electrical connection of two components of the differential pressure sensor.
- using the bonding layers for electrical shielding of the differential pressure sensor represented such desirable electrical functionality.
- An advantageous development of the invention provides that the realization of the electrical functionality, the first and / or the second bonding layer is connected in terms of circuitry with at least one component of the electrical transducer element.
- the development provides that the differential pressure measuring cell has a first and a second main body, each having a layer structure of at least a first electrically conductive layer and a first and a second
- first and the second base body is pressure-tight respectively connected via the first insulating layer with a measuring membrane in a peripheral edge region, wherein the first insulating layer is each structured such that in each case forms a pressure chamber between the measuring membrane and the first electrically conductive layer , wherein the first and the second basic body in each case via the first and second
- Capacitance which forms between the measuring membrane as a first electrode and at least a portion of the respective first electrically conductive layer as a second electrode is detected, wherein the respective second electrode as a component of the electric
- Transducer element is at least partially electrically contacted by the first and the second joint, each having an electrode terminal, so that the first and second joint at least partially serves as an electrical conductor or electrically conductive connection.
- the development can provide that the respective electrode connection is arranged on an outer surface of the first or second main body extending substantially perpendicular to the measuring diaphragm and / or the respective one
- Electrode terminal is applied in the form of an applied on the outer surface electrically conductive electrode connection layer.
- the respective electrode connection is realized by an outer surface of the first or second stiffening body extending substantially perpendicular to the measuring membrane and / or the first or the second stiffening body comprises a semiconductor material and the outer surface of the first or the second stiffening body forms the electrode connection.
- Insulating layer is arranged, has.
- a further advantageous development may further provide that a guard circuit for setting a potential and applying this at least to the further electrically conductive layer and / or the outer edge is provided, wherein the guard circuit is adapted to an electrode potential of the picks off second electrode and the potential adjusted so that it is tracked substantially the electrode potential.
- the development provides that the first and second stiffening body comprises a semiconductor material, and the guard circuit is further adapted to apply the potential to an electrically conductive portion of the first and second stiffening body.
- circuit connection comprises a guard circuit for setting a shield potential and applying this at least to the first and / or second bonding layer and the guard circuit is designed to use an electrode potential of the second electrode as a
- FIG. 3 shows a sectional drawing through a second embodiment of a
- a differential pressure sensor comprises a
- Stiffening body 1 19 joined so as to prevent bursting of the differential pressure measuring cell 100 at too high a pressure.
- the differential pressure measuring cell 100 comprises an electrical capacitive transducer element with a pressure-sensitive, electrically conductive measuring diaphragm 103 arranged between a first and a second main body 101, 102, wherein the measuring diaphragm 103 is connected in each case by a first insulating layer 104 to the first or the second main body 101, 102 is.
- each second electrode 1 10 each comprises an electrode terminal 1 15, which are connected via an electrically conductive connection or an electrical conductor 1 16 with the second electrode 1 10.
- the electrically conductive connection 16 is preferably formed from interconnected partial regions or partial conductors.
- first and / or the second joining layer 1 16, 1 17 serves not only for the mechanical connection of the differential pressure measuring cell 100 with the first and second stiffening body 1 18, 1 19, but also an electrical functionality in the form of an electrically conductive connection Fulfills.
- further electrically conductive subregions which are formed, for example, from a coated metallization, can serve as further parts of the electrically conductive connection.
- the electrode connections 1 15 are arranged on an outer surface of the first and / or second basic body 101, 102 that runs essentially perpendicular to the measuring membrane 103.
- electrically conductive electrode terminals 1 15, which are for example.
- the electrode terminals 15 are preferably formed on the outer surface of the further electrically conductive layer 107, an electrode insulation layer 121, for example a silicon oxide layer, being provided between the electrode terminals 115 and the further electrically conductive layer 107.
- Measuring membrane 103 and the electrodes opposite thereto each have a capacitive coupling, but also between the electrodes and their environment and between the measuring membrane and its environment to be minimized.
- the first and / or second Stiffening body comprises a semiconductor material
- the second exemplary embodiment illustrated in FIG. 3 differs from the exemplary embodiment illustrated in FIG. 2 in that the electrode terminals 15 do not act on the outer surface of the first or second basic body 101, 102, respectively
- Electrode terminals 1 15 are the outer surface of the first and second stiffening body 1 18, 1 19 itself. This offers the advantage that no more extensive metallization or the like is needed between the electrode terminals 115 and the outer surface.
- the second exemplary embodiment provides that an insulating layer, for example in the form of a silicon oxide layer and / or an electrically conductive layer, for example in the form of a highly doped semiconductor layer, is formed on the stiffening bodies 1 18, 1 19 on the sides facing away from the differential pressure measuring cell 100 is.
- a further electrically conductive layer is provided, this is preferably applied to the potential via the guard circuit, so that their potential is also tracked to the electrode potential.
- the circuit connection comprises a guard circuit for
- the guard circuit is designed such that it picks up an electrode potential of the second electrode as a component of the electrical conversion element and adjusts the shield potential in such a way that it tracks the electrode potential, ie there is a linear dependence between the two potentials.
- WO 2016/066306 A1 international application with international publication number WO 2016/066306 A1, the contents of which are fully incorporated herein. Especially The content of FIG. 5 and the associated description of the figures of WO 2016/066306 A1 are included.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016112352.8A DE102016112352A1 (de) | 2016-07-06 | 2016-07-06 | Differenzdrucksensor zur Bestimmung eines Druckmesssignals |
PCT/EP2017/065634 WO2018007179A1 (de) | 2016-07-06 | 2017-06-26 | Differenzdrucksensor |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3482181A1 true EP3482181A1 (de) | 2019-05-15 |
Family
ID=59152918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17732447.2A Ceased EP3482181A1 (de) | 2016-07-06 | 2017-06-26 | Differenzdrucksensor |
Country Status (5)
Country | Link |
---|---|
US (1) | US20190170595A1 (de) |
EP (1) | EP3482181A1 (de) |
CN (1) | CN109416291A (de) |
DE (1) | DE102016112352A1 (de) |
WO (1) | WO2018007179A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018102918A1 (de) * | 2018-02-09 | 2019-08-14 | Endress+Hauser SE+Co. KG | Differenzdrucksensor |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4581676A (en) * | 1984-09-17 | 1986-04-08 | General Signal Corporation | Electrical contact coating for silicon pressure transducers |
DE10052053A1 (de) * | 2000-10-19 | 2002-04-25 | Endress Hauser Gmbh Co | Druckmeßzelle |
JP3887290B2 (ja) * | 2002-09-17 | 2007-02-28 | 株式会社山武 | 差圧発信器 |
CN101738282A (zh) * | 2008-11-21 | 2010-06-16 | 重庆川仪自动化股份有限公司 | 对地隔离的压力/差压传感器 |
JP5867820B2 (ja) * | 2012-03-08 | 2016-02-24 | セイコーインスツル株式会社 | 圧力センサ |
DE102012113033A1 (de) * | 2012-12-21 | 2014-06-26 | Endress + Hauser Gmbh + Co. Kg | Mechanische Stabilisierung und elektrische sowie hydraulische Adaptierung eines Silizium Chips durch Keramiken |
DE102013114734A1 (de) * | 2013-12-20 | 2015-07-09 | Endress + Hauser Gmbh + Co. Kg | Kapazitive Druckmesszelle mit mindestens einem Temperatursensor und Druckmessverfahren |
DE102014109491A1 (de) * | 2014-07-08 | 2016-02-11 | Endress + Hauser Gmbh + Co. Kg | Differenzdruckmesszelle |
DE102014115802A1 (de) | 2014-10-30 | 2016-05-04 | Endress + Hauser Gmbh + Co. Kg | Kapazitiver Drucksensor und Verfahren zu dessen Herstellung |
DE102015103485A1 (de) * | 2015-03-10 | 2016-09-15 | Endress + Hauser Gmbh + Co. Kg | MEMS-Sensor, insb. Drucksensor |
-
2016
- 2016-07-06 DE DE102016112352.8A patent/DE102016112352A1/de not_active Withdrawn
-
2017
- 2017-06-26 WO PCT/EP2017/065634 patent/WO2018007179A1/de unknown
- 2017-06-26 EP EP17732447.2A patent/EP3482181A1/de not_active Ceased
- 2017-06-26 CN CN201780042028.3A patent/CN109416291A/zh active Pending
- 2017-06-26 US US16/315,233 patent/US20190170595A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
DE102016112352A1 (de) | 2018-01-11 |
CN109416291A (zh) | 2019-03-01 |
US20190170595A1 (en) | 2019-06-06 |
WO2018007179A1 (de) | 2018-01-11 |
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