EP0979384A1 - Weg-/winkelsensor - Google Patents
Weg-/winkelsensorInfo
- Publication number
- EP0979384A1 EP0979384A1 EP98931929A EP98931929A EP0979384A1 EP 0979384 A1 EP0979384 A1 EP 0979384A1 EP 98931929 A EP98931929 A EP 98931929A EP 98931929 A EP98931929 A EP 98931929A EP 0979384 A1 EP0979384 A1 EP 0979384A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- track
- potentiometer
- collector
- displacement
- angle 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/30—Adjustable resistors the contact sliding along resistive element
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
- G01D5/165—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance by relative movement of a point of contact or actuation and a resistive track
Definitions
- the invention relates to a displacement / angle sensor, comprising a potentiometer track arranged on a support, which can be acted upon by an alternating voltage, a collector track arranged on the support, a first probe displaceably guided over the potentiometer track and a second one which is electrically coupled to it and slidably guided over the collector track Probe.
- Such a capacitance-coupled, non-contact displacement / angle sensor can be found, for example, in US Pat. No. 5,525,955.
- both the potentiometer track 82 and the collector track 84 are arranged on both sides of a carrier 80, which has an essentially I-shaped shape.
- this carrier 80 is surrounded by a metallic tube which serves to shield electromagnetic interference from the outside. With this shielding, however, overcoupling between the potentiometer track 82 and the collector track 84, which is caused by an essentially dipole-like electrical field E, which is formed around the potentiometer track 82 and the collector track 84, cannot be avoided (see FIG. 3) .
- parasitic capacitances and loss resistances exist in such displacement / angle sensors.
- parasitic impedances are shown schematically in FIG. 4.
- parasitic capacitances Cpm 'and loss resistances Rpm' between the potentiometer path and the ground, for example a housing.
- parasitic capacitances Ckm 'and loss resistances Rkm' between the collector path and the ground.
- parasitic capacitances Csm and loss resistances Rsm occur between the electrical coupling line of the two measuring probes and the ground.
- the invention is therefore based on the object of improving a displacement / angle sensor of the generic type in such a way that interferences caused by electromagnetic fields and also by parasitic capacitances and loss resistances are minimized and the measuring precision of the displacement / angle sensor is thereby increased.
- the arrangement of the potentiometer track together with the assigned first probe as well as the collector track together with the assigned second probe in spatially separated, shielded rooms has the great advantage that the formation of electromagnetic fields between the potentiometer track and the collector track and the resulting interference are largely avoided. Rather, electromagnetic fields only arise within the two spatially separated, shielded spaces, field lines being "sucked" to a certain extent in a particularly advantageous manner by the shielding surfaces lying at ground potential.
- the shielding surfaces can be designed and arranged in a wide variety of ways.
- they can be attached to the carrier.
- a particularly advantageous embodiment which proves to be very advantageous in particular with regard to the manufacture of the carrier and the shielding surfaces, provides that the shielding surfaces are connected in one piece to the carrier. In this way, carriers and shielding surfaces can be produced in one processing operation, for example by extrusion. In addition, this also ensures that carriers and shielding surfaces have the same potential, i.e. the ground potential.
- these projections enable easy assembly of the potentiometer track and the collector track, on the other hand, they achieve a very precise positional fixation of the potentiometer track and the collector track, so that a precise distance between the probes guided over the potentiometer track / collector track and the potentiometer track / Collector path is given.
- the potentiometer track and the collector track can be attached to the projections in a variety of ways.
- they could be attached to the projections by an adhesive connection.
- a very advantageous embodiment which not only enables simple assembly, but also makes it possible to compensate for unevenness in the projections or the collector or the potentiometer track, provides that the potentiometer track and the collector track against the projections by means of an elastic return means, preferably a rubber cord be pressed.
- the Projection arranged above the linearization area of the potentiometer track covers the linearization area of the potentiometer track. It is understood that the carrier is at a defined voltage potential.
- the shielding surfaces can have any shape, for example a flat, an angled or any shape.
- the shielding surfaces are essentially circularly curved toward each of the potentiometer path and the collector path and that at least one opening for the guide and electrical is provided between two directly opposite shielding surfaces Contacting the probes is provided.
- FIG. 1 shows a sectional illustration of a first exemplary embodiment of a displacement / angle sensor according to the invention with the probes omitted;
- 2a, b schematically show the independent linearity over the position in the displacement / angle sensor (a) according to the invention shown in FIG. 1 and in the displacement / angle sensor (b) shown in FIG. 3 and known from the prior art;
- Fig. 3 is a sectional view of one from the
- Fig. 4 shows schematically the representation of the parasitic capacitances and loss resistances, which can occur in principle with displacement / angle sensors.
- An exemplary embodiment of a displacement / angle sensor shown in FIG. 1, comprises a support, designated as a whole by 10, on which a potentiometer track 20 and a collector track 30 are arranged.
- Shielding surfaces 11, 12, which cover the potentiometer track 20, and shielding areas 13, 14, which cover the collector track 30, are integrally connected to the carrier 10. These shielding surfaces 11, 12, 13, 14 are circularly curved in the direction of the potentiometer track 20 and the collector track 30, respectively, between the shielding areas 11, 12, which are opposite the potentiometer track 20, and between the shielding areas 13, 14, which are the collector track 30 opposite each other, an opening 15, 16 is provided for the guidance and the electrical contacting of the first probe assigned to the potentiometer track
- the probes are moved perpendicular to the sheet plane above the potentiometer / collector track (20, 30).
- Both the potentiometer track 20 and the first probe assigned to it, as well as the collector track 30 and the second probe assigned to it, are arranged in shielded areas 22 and 32, which are spatially separated from one another, by the design of the shielding surfaces 11, 12 and 13, 14, respectively .
- shielding surfaces 11, 12, 13, 14 are at ground potential together with the carrier 10
- electric field lines which originate from the potentiometer track 20 or from the collector track 30 are caused by the shielding surfaces 11, 12 or respectively arranged adjacent to them 13, 14 to a certain extent "suctioned off", with this arrangement taking advantage of the principle of natural law that field lines on conductive surfaces (here the shielding surfaces 11, 12, 13, 14) end vertically.
- This arrangement of the shielding surfaces 11, 12, 13, 14 therefore avoids parasitic capacitances Cpk 'and loss resistances Rpk' (see FIG. 4) caused by electric fields between the potentiometer track and the collector track, since such electric fields cannot even arise .
- Protrusions 24, 25 and 34, 35, on which the potentiometer track 20 and the collector track 30 come to rest, are arranged on the support adjacent to the shielding surfaces 11, 12 and 13, 14.
- Both the potentiometer track 20 and the collector track 30 are on the projections 24, 25 or 34, 35 assigned to them by, for example, a rubber cord 26, 36 in a recess 16 or 17 provided for them the carrier 10 are arranged between the potentiometer path 20 and the surface of the carrier 10 delimiting the recess 16 or between the collector path 30 and the surface delimiting the recess 17.
- This elastic arrangement compensates for unevenness in the projections 24, 25, 34, 35 and / or the potentiometer track 20 or the collector track 30.
- a carrier shown in Fig. 1 has a length of 1000 mm and more can, so that bumps can have a significant impact.
- the projections 24, 25, on which the potentiometer track 20 comes to rest, and the projections 34, 35, on which the collector track 30 comes to rest, enables the potentiometer track 20 or the collector track 30 to be precisely positioned. These projections in particular also ensure that the distance between the probe guided in each case over the potentiometer track 20 or the collector track 30 and the potentiometer track 20 or the collector track 30 is kept constant.
- the length of one of the protrusions lying above the potentiometer track 20 is selected such that the linearization region 21 of the potentiometer track 20 is covered by the protrusion 25.
- the projection 25 lies together with the carrier 10 at a defined voltage potential, for example the ground potential. This prevents parasitic capacitances between the two separate regions of a potentiometer path linearized in a manner known per se by controlled milling of part of the resistance track.
- This design of the displacement / angle sensor also minimizes parasitic capacitances Cpm 'and loss resistances Rpm' between the potentiometer track 20 and the ground potential, and parasitic capacitances Ckm 'and loss resistances Rkm' between the collector track 30 and the ground potential.
- the independent linearity over the position of a displacement sensor shown in FIG. 1 is shown in FIG. 2a.
- the curve represented by I corresponds to the linearity curve as a function of the position of the sensors of the displacement sensor without a metallic tube surrounding it.
- the course labeled II corresponds to a linearity measurement depending on the position of the probes of the displacement sensor arranged in a floating tube.
- the linearity curve represented by III above the position of the probes corresponds to that of the displacement sensor arranged in a tube which is at ground potential.
- FIG. 2b shows the linearity curve over the position in the case of a displacement sensor, as is shown schematically in FIG. 3.
- the measurements shown in FIG. 2b were carried out under the same measurement conditions as the measurements shown in FIG. 2a.
- the measurement curve profiles are designated in a corresponding manner as in Fig. 2a.
- FIG. 2b A comparison of Fig. 2a and Fig. 2b shows that in the displacement sensor shown in Fig. 1 there is a very good linearity regardless of the arrangement and the ambient conditions of the displacement sensor, whereas in the displacement sensor, the linearity curve in Fig. 2b is shown, a significantly poorer linearity curve over the position results, which in particular also depends on the arrangement and the ambient conditions of the displacement sensor.
- the course shown in FIG. 2b has a particularly non-linear course if the displacement sensor is arranged in a potential-free tube. Such influences play no role in the displacement sensor shown in FIG. 1, whose linearity curve is shown in FIG. 2a.
- the displacement sensor shown in FIG. 1 results in an improvement in the linearity which is independent of the measuring conditions, the arrangement of the displacement sensor and the ambient conditions.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19718024 | 1997-04-29 | ||
DE19718024A DE19718024C2 (de) | 1997-04-29 | 1997-04-29 | Weg-/Winkelsensor |
PCT/DE1998/001069 WO1998049520A1 (de) | 1997-04-29 | 1998-04-15 | Weg-/winkelsensor |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0979384A1 true EP0979384A1 (de) | 2000-02-16 |
Family
ID=7828064
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98931929A Withdrawn EP0979384A1 (de) | 1997-04-29 | 1998-04-15 | Weg-/winkelsensor |
Country Status (4)
Country | Link |
---|---|
US (1) | US6316947B1 (de) |
EP (1) | EP0979384A1 (de) |
DE (1) | DE19718024C2 (de) |
WO (1) | WO1998049520A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050181394A1 (en) * | 2003-06-20 | 2005-08-18 | Illumina, Inc. | Methods and compositions for whole genome amplification and genotyping |
DE102005010692A1 (de) * | 2005-03-09 | 2006-09-14 | Zf Friedrichshafen Ag | Sensoreinrichtung und Verfahren zur Verwendung einer Sensoreinrichtung |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES278734Y (es) * | 1984-04-11 | 1985-04-16 | Piher Navarra, S.A. | Potenciometro perfeccionado |
JPH02504688A (ja) * | 1987-07-07 | 1990-12-27 | ツァーンラトファブリック フリードリッヒシャーフェン アクチエン ゲゼルシャフト | 回転角電位差計 |
US5049827A (en) * | 1990-01-12 | 1991-09-17 | Jet Electronics & Technology Inc. | Non-contacting potentiometer |
FR2692982B1 (fr) * | 1992-04-24 | 1997-01-17 | Aerospatiale | Dispositif rotor/stator de modulation de tension, notamment pour moteur electrique sans balais. |
WO1994011888A1 (en) * | 1992-11-10 | 1994-05-26 | Copal Company Limited | Potentiometer |
US5499544A (en) * | 1993-03-25 | 1996-03-19 | Lew; Hyok S. | Capacitively coupled ohmic resistance position sensor |
JP3370451B2 (ja) * | 1994-10-14 | 2003-01-27 | 富士写真光機株式会社 | 電動雲台の回転角度検出装置 |
JP3370450B2 (ja) * | 1994-10-14 | 2003-01-27 | 富士写真光機株式会社 | 電動雲台の回転角度検出装置 |
DE4447295A1 (de) * | 1994-11-10 | 1996-05-15 | Siedle Horst Kg | Verfahren und Vorrichtung zur Bestimmung einer jeweiligen örtlichen Position eines Körpers durch kapazitive Abtastung |
DE4447294A1 (de) * | 1994-11-10 | 1996-05-15 | Siedle Horst Kg | Verfahren und Vorrichtung zur Bestimmung einer jeweiligen örtlichen Position eines Körpers |
-
1997
- 1997-04-29 DE DE19718024A patent/DE19718024C2/de not_active Expired - Fee Related
-
1998
- 1998-04-15 EP EP98931929A patent/EP0979384A1/de not_active Withdrawn
- 1998-04-15 WO PCT/DE1998/001069 patent/WO1998049520A1/de not_active Application Discontinuation
-
1999
- 1999-10-29 US US09/433,035 patent/US6316947B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9849520A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19718024A1 (de) | 1998-11-05 |
DE19718024C2 (de) | 2000-04-13 |
WO1998049520A1 (de) | 1998-11-05 |
US6316947B1 (en) | 2001-11-13 |
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Legal Events
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