WO2002040956A1 - Resonator chip sensor für druck, kraft mit mechanisch entkoppelten teilbereichen (schlitze) sowie weicher membran - Google Patents
Resonator chip sensor für druck, kraft mit mechanisch entkoppelten teilbereichen (schlitze) sowie weicher membran Download PDFInfo
- Publication number
- WO2002040956A1 WO2002040956A1 PCT/CH2001/000650 CH0100650W WO0240956A1 WO 2002040956 A1 WO2002040956 A1 WO 2002040956A1 CH 0100650 W CH0100650 W CH 0100650W WO 0240956 A1 WO0240956 A1 WO 0240956A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- force
- chip
- sensor according
- lateral
- Prior art date
Links
Classifications
-
- 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
- G01L9/0001—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
- G01L9/0008—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using vibrations
- G01L9/0019—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using vibrations of a semiconductive element
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
- G01L1/183—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material by measuring variations of frequency of vibrating piezo-resistive material
Definitions
- the invention relates to a sensor according to the preamble of claim 1.
- the chip used in which a resonator is used as a measuring sensor, is known from a lecture by Mr. M. Haueis at the 20th International Congress of Theoretical and Applied Mechanies, August 27 to September 02, 2000, Chicago, Illinois, USA, which was published as abstract TL1 "Single crystalline microresonator for force sensing with on-chip vibration excitation and detection" by M. Haueis et al.
- a more detailed description of this sensor the development of which was based on the task of creating a sensor for an extended temperature range - up to about 300 ° C., is published in the paper: Haueis M. et al.
- the chip of this known sensor is clamped in a housing by two bolts arranged on both sides of the sensor. It has now been shown that this sensor reacts sensitively to temperature fluctuations by which changing voltages are induced in the sensor. This temperature sensitivity is caused by different thermal expansion of chip material, in the present example silicon, and housing, which generally consists of steel.
- the object of the invention is to at least reduce this temperature sensitivity, which is achieved by the features in the characterizing part of claim 1.
- both sides of the chip can expand to different extents from the areas of the fastening without causing thermal mechanical stresses in the sensor.
- the decoupled middle leg can be connected locally to the lateral legs by means of webs.
- a precise adjustment of the chip in the direction of the force application can be achieved by a stop.
- Another possibility is to align the outer edges of the lateral legs in the longitudinal direction parallel to the edge of the slot.
- the middle leg via which the force is applied, can be prestressed relative to the lateral legs, preferably in tension, in order to improve the linearity of the measurement results and / or to determine the measurement range.
- Fig. 1 in a spatial representation the chip containing the sensor
- Fig. 2 shows a side view of the chip inserted into part of the housing
- Fig. 3 is a plan view of FIG. 2;
- Fig. 4 shows a longitudinal section IV-IV of Figure 3 through the complete, i.e. complemented by a second housing part, sensor; Fig. 5 in the same representation as Fig. 1, a second embodiment of the chip.
- the measuring element of the sensor is a chip 1 (FIG. 1), which consists of three silicon wafers connected to one another in a gastight manner. He is Manufactured in a known manner using SOI technology and contains the actual sensor 2 in the middle layer, which is, for example, a micromechanical resonator, but can also be another force-sensitive element.
- the middle layer which is, for example, a micromechanical resonator, but can also be another force-sensitive element.
- piezoelectric or magnetorestrictive elements as well as piezoresistive or agnetoresistive resistors can be used as measuring sensors.
- contact pads 3 are indicated above the sensor 2, via which the sensor 2 is connected to the associated electronics 15 (FIG. 2) by means of wire bonding.
- a slot 4 shields the sensor 2 against mechanical incorrect loads, which can be caused, for example, by the bonded wire connections of the contact pads 3 to the electronics.
- the sensor 2 is accommodated in a relatively narrow strip of the chip 1.
- This strip which widens into a central leg 5 receiving the central fastening, is separated by slots 6 and cavities 7 from lateral legs 8 and mechanically decoupled, which in turn form the lateral fastenings. It has the task of bundling the forces introduced specifically to sensor 2.
- a bolt 9 serves as the central fastening, which is inserted into a bore 10 of the chip 1 with slight play and is connected to a sensor head 11 (FIG. 4), for example, by crimping.
- Partial surfaces 12 of the lateral legs 8 serve as lateral attachments, which are inserted into a slot 25 of a cylindrical housing part 13 (FIG. 2) and adjusted in the longitudinal direction of the chip 1 by a stop 14.
- the subregions 12 can be additionally fixed in the housing part 13 by gluing or another fixed connection.
- the chip 1 is aligned through the slot 25 in the two directions orthogonal to the introduction of force 17.
- the sensor head 11, which has an internal thread 21 (FIG. 4) for connecting a force-introducing connection, is connected on its outer circumference to a steel membrane 22 which is connected in the longitudinal direction, ie in the direction of the force application, via a membrane sleeve 23 in the housing part 13 , adjustable and fixed (point 24).
- this pretension preferably consists of a tensile load.
- the membrane 22 is made relatively soft, as a result of which a high sensitivity and a reduction in the thermal errors reaching the measuring sensor are achieved.
- the precise axial and central introduction of force into the chip 1 is improved with a soft membrane 22.
- the webs 16 bridging the slots 6 have the effect that the elasticity of the sensor is great in the direction 17 of the force introduction, while there is increased rigidity in the two directions perpendicular thereto.
- the thermal expansion of the components for the introduction of the force to be measured should be as large as possible as that of the fixing of the chip 1 in the housing part 13 and the introduction of force. This is preferably achieved by an identical choice of material for the components 11, 13 and 23 lying in between and an equal distance a between the application of force via the internal thread 21 to the bore 10 on the one hand and to the adhesive or clamping areas on the partial surfaces 12 of the lateral fastenings or to the stop 14 guaranteed.
- a chip 1 for such a variant is shown in FIG. 5.
- the displacement of the end of the side legs 8 or the fixing regions 12 resting against the stop 14 relative to the point of application of the force application at the bore 10 of the central leg 5 should be the difference in the thermal expansions of the different materials for the sensor head 11 on the one hand and for the membrane sleeve 23 and the housing part 13 on the other hand correspond to the maximum required temperature range.
- the cylindrical housing part 13 is “cut open” on the left-hand side and forms a shell there, the free end of which is provided with a thread 18.
- a second housing part 19 (FIG. 4) is screwed onto this, which closes the open shell of the housing part 13 and covers both the electronics 15 and the chip 1.
- the part 19 is designed on the left as a hexagon head for the attachment of a wrench and on the right has a thread 20 with which the sensor can be screwed into a measurement object. Due to the two-part design of the housing, decoupling from the measurement object and an insensitivity to voltages caused by the installation of the sensor are also achieved.
- the housing parts 13, 19 are preferably made of steel.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/416,369 US20040011144A1 (en) | 2000-11-15 | 2001-11-07 | Resonator chip sensor for pressure and force with mechanically separate partial regions (slots) and a soft membrane |
EP01980096A EP1334341A1 (de) | 2000-11-15 | 2001-11-07 | Resonator chip sensor für druck, kraft mit mechanisch entkoppelten teilbereichen ( schlitze ) sowie weicher membran |
JP2002542836A JP2004513378A (ja) | 2000-11-15 | 2001-11-07 | 圧力及び/又は力を測定するセンサ |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH2223/00 | 2000-11-15 | ||
CH22232000 | 2000-11-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002040956A1 true WO2002040956A1 (de) | 2002-05-23 |
Family
ID=4568080
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH2001/000650 WO2002040956A1 (de) | 2000-11-15 | 2001-11-07 | Resonator chip sensor für druck, kraft mit mechanisch entkoppelten teilbereichen (schlitze) sowie weicher membran |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040011144A1 (de) |
EP (1) | EP1334341A1 (de) |
JP (1) | JP2004513378A (de) |
WO (1) | WO2002040956A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060070464A1 (en) * | 2004-09-30 | 2006-04-06 | Walker Robert R | On-board scale sensor with mechanical amplification and improved output signal apparatus and method |
WO2010072232A1 (en) * | 2008-12-22 | 2010-07-01 | Ab Skf | Sensorized bearing unit |
JP6228790B2 (ja) * | 2013-09-18 | 2017-11-08 | アルプス電気株式会社 | 圧力検知装置およびこれを使用した吸気圧測定装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH424312A (de) * | 1964-08-15 | 1966-11-15 | Kistler Instrumente Ag | Beschleunigungskompensierter piezoelektrischer Messwandler |
EP0430445A2 (de) * | 1989-11-02 | 1991-06-05 | Matsushita Electric Industrial Co., Ltd. | Piezoelektrischer Druckwandler |
US5574220A (en) * | 1994-08-10 | 1996-11-12 | Sagem Sa | Vibrating beam force-frequency transducer |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3204454A (en) * | 1962-02-21 | 1965-09-07 | Asea Ab | Means for measuring the tension in a strip or sheet shaped material |
US4522066A (en) * | 1982-05-13 | 1985-06-11 | Kistler-Morse Corporation | Temperature-compensated extensometer |
DE3232817C1 (de) * | 1982-09-03 | 1988-09-08 | Endress U. Hauser Gmbh U. Co, 7867 Maulburg | Biegefeder |
DE19626081A1 (de) * | 1996-06-28 | 1998-01-02 | Siemens Ag | Halbleiter-Bauelement |
DE19840829B4 (de) * | 1998-09-07 | 2005-10-20 | Siemens Ag | Verfahren zum Befestigen eines mikromechanischen Sensors in einem Gehäuse und Sensoranordnung |
-
2001
- 2001-11-07 EP EP01980096A patent/EP1334341A1/de not_active Withdrawn
- 2001-11-07 WO PCT/CH2001/000650 patent/WO2002040956A1/de not_active Application Discontinuation
- 2001-11-07 JP JP2002542836A patent/JP2004513378A/ja not_active Withdrawn
- 2001-11-07 US US10/416,369 patent/US20040011144A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH424312A (de) * | 1964-08-15 | 1966-11-15 | Kistler Instrumente Ag | Beschleunigungskompensierter piezoelektrischer Messwandler |
EP0430445A2 (de) * | 1989-11-02 | 1991-06-05 | Matsushita Electric Industrial Co., Ltd. | Piezoelektrischer Druckwandler |
US5574220A (en) * | 1994-08-10 | 1996-11-12 | Sagem Sa | Vibrating beam force-frequency transducer |
Also Published As
Publication number | Publication date |
---|---|
US20040011144A1 (en) | 2004-01-22 |
JP2004513378A (ja) | 2004-04-30 |
EP1334341A1 (de) | 2003-08-13 |
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