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WO1986007144A1 - Agencement a capteur - Google Patents

Agencement a capteur Download PDF

Info

Publication number
WO1986007144A1
WO1986007144A1 PCT/DE1986/000182 DE8600182W WO8607144A1 WO 1986007144 A1 WO1986007144 A1 WO 1986007144A1 DE 8600182 W DE8600182 W DE 8600182W WO 8607144 A1 WO8607144 A1 WO 8607144A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
sensor arrangement
arrangement according
measuring
measurement
Prior art date
Application number
PCT/DE1986/000182
Other languages
German (de)
English (en)
Inventor
Klaus Dobler
Hansjörg Hachtel
Karl Roll
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO1986007144A1 publication Critical patent/WO1986007144A1/fr

Links

Classifications

    • 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
    • G01D5/20—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 inductance, e.g. by a movable armature
    • G01D5/2006—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 inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
    • G01D5/202—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 inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by movable a non-ferromagnetic conductive 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
    • 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
    • G01D5/20—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 inductance, e.g. by a movable armature
    • G01D5/2006—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 inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
    • G01D5/2013—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 inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by a movable ferromagnetic element, e.g. a core

Definitions

  • the invention is based on a sensor arrangement according to the type of the main claim.
  • the sensor consists of a measuring tube and a coil which is wound in one layer and uniformly on a core and is connected to a voltage divider or bridge circuit.
  • This results in an S-shaped calibration curve.
  • their flattening at the beginning and at the end falsifies the measurement result.
  • It is known to linearize the course of the calibration curve with the aid of amplifiers whose amplification factor changes as a function of the input voltage level.
  • each individual sensor type is assigned a specially adapted electronics unit.
  • the amplification factor in electronic units designed in this way is relatively strongly dependent on the level of the ambient temperature because of the necessary connection with non-linear resistors.
  • the sensor arrangement according to the invention with the characterizing features of the main claim has the advantage that the calibration curve is almost linear over the entire measuring range. There is therefore always a proportional relationship between the measuring signal and the immersion depth of the coil in the measuring tube. This is possible with the help of simple structural measures. Furthermore, even with a constant gain factor over the almost entire measuring range, i.e. A sufficiently precise proportional measuring voltage can be generated over the entire coil length.
  • FIG. 1 shows a circuit representation of the exemplary embodiment
  • FIG. 2 shows a section through a sensor arrangement in a simplified representation
  • FIG. 3 shows a non-linear calibration curve according to the prior art
  • FIG. 4 shows a modification of the exemplary embodiment according to FIG. 2.
  • an evaluation circuit is shown.
  • an alternator 10 has a measuring coil 11 with a high frequency quent alternating current feeds.
  • the measuring coil 11 is connected to the series resistor 13 to form a voltage divider 14.
  • a resistor 12 is connected in parallel with the measuring coil 11.
  • a diode 15 is connected in series with the series resistor 13.
  • a capacitor 16 is connected in parallel with the resistor 12.
  • a low-pass filter 19 consisting of a resistor 17 and a capacitor 18 is connected to the tap of the voltage divider 14 for smoothing the measured values.
  • a conventionally known amplifier circuit 20, which has two resistors 21, 22 and an operational amplifier 23, is connected in series with the low-pass filter 19.
  • FIG. 2 shows a sensor 26 which has a measuring tube 27 in which the measuring coil 11 wound on a core 28 in one layer can be moved.
  • the measuring coil 11 has regions 11a, 11b, 11c with different winding densities.
  • the core 28 is made of a non-electrically conductive material, e.g. Polyamide or PVC.
  • the measuring tube 27 is made of a highly conductive material.
  • the core 28 dips with the measuring coil 11 into the measuring tube 27, i.e. Core 28 and measuring tube 27 are moved relative to each other. Because of the eddy current effect, the AC resistance of the measuring coil 11 changes. Eddy currents are formed on the metallic inside of the measuring tube 27, which change the AC resistance of the measuring coil 11 and thus the applied voltage. This voltage, which is now different at the respective time, is rectified with the aid of the low-pass filter 19 and amplified with the amplifier circuit 20.
  • linearity errors are unavoidable in voltage dividers or bridge circuits in which the resistance value is changed only in part, in this case in the measuring coil 11.
  • These linearity errors can now be compensated for by a non-uniform winding of the measuring coil 11.
  • the windings are wound on the two outer regions 11a, 11c of the measuring coil 11 with different pitches compared to the central region 11b.
  • the windings on the two outer regions 11a, 11c of the measuring coil 11 should lie close to one another and continuously merge into a central region 11b with the same distance between the windings, ie the windings are no longer in contact with one another.
  • the end of the measuring coil 11, which first immerses in the measuring tube 27, has a shorter area 11c with a tight winding than the other end of the measuring coil 11.
  • This compression of the windings at the coil ends leads to an almost linear calibration curve 30 of the applied measuring voltage U via the immersion depth S of the measuring coil 11 into the measuring tube 27.
  • This different compression of the turns is necessary because the S-shaped calibration curve 30 has a different slope at the beginning and at the end of the immersion depth.
  • the linearity errors of the voltage divider or the bridge circuit can be compensated.
  • One explanation for this effect is an increase in the alternating magnetic field at the En to see that of the measuring coil 11, ie in the areas 11a and 11c, by a larger number of windings per coil length, and by the resulting higher number of damped turns.
  • the measuring coil on a hollow cylinder made of non-electrically conductive material, into which the metallic core is immersed. Eddy currents can form on its surface, as described above.
  • the sensor arrangement can also be operated using the inductive method.
  • the winding density is then to be matched to a calibration curve with a positive slope. The same conditions apply accordingly.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

Une bobine de mesure (11) est reliée à un circuit diviseur de tension (14) ou circuit en pont. Elle est enroulée sur un noyau (28) et se déplace par rapport à un tube de mesure (27). La bobine de mesure (11) a des zones (11a, 11b, 11c) dont la densité de bobine diffère de telle sorte que la tension enregistrée à la sortie des circuits a une courbe linéaire caractéristique correspondant au mouvement de la bobine de mesure (11) par rapport au tube de mesure (27). Il est possible de compenser les erreurs de linéarité dans le circuit diviseur de tension (14) ou circuit en pont, ainsi que les erreurs de mesure dans la bobine de mesure (11) dues au champ magnétique non homogène.
PCT/DE1986/000182 1985-05-24 1986-05-02 Agencement a capteur WO1986007144A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853518772 DE3518772A1 (de) 1985-05-24 1985-05-24 Sensoranordnung
DEP3518772.7 1985-05-24

Publications (1)

Publication Number Publication Date
WO1986007144A1 true WO1986007144A1 (fr) 1986-12-04

Family

ID=6271595

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1986/000182 WO1986007144A1 (fr) 1985-05-24 1986-05-02 Agencement a capteur

Country Status (4)

Country Link
EP (1) EP0221934A1 (fr)
DE (1) DE3518772A1 (fr)
ES (1) ES8707610A1 (fr)
WO (1) WO1986007144A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0366227A2 (fr) * 1988-10-27 1990-05-02 Macome Corporation Appareil de mesure de déplacement
WO1993004341A2 (fr) * 1991-08-24 1993-03-04 Robert Bosch Gmbh Dispositif de mesure pour la determination sans contact du deplacement ou de l'angle de rotation d'un composant
US5331277A (en) * 1992-08-07 1994-07-19 Eldec Corporation Inductive divider position sensor with fixed and variable impedance inductors
US5453685A (en) * 1993-07-30 1995-09-26 Philips Electronics North America Corporation Inductive position sensing device and apparatus with selectable winding configuration

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4301239A1 (de) * 1993-01-19 1994-07-21 Bosch Gmbh Robert Einrichtung zur berührungsfreien Bestimmung einer Lage eines Bauteiles
DE4331909A1 (de) * 1993-09-20 1995-03-23 Bosch Gmbh Robert Drehwinkelgeber
GB9607750D0 (en) * 1996-04-15 1996-06-19 Radiodetection Ltd Displacement sensors
DE19805120A1 (de) * 1998-02-09 1999-08-12 Asea Brown Boveri Hochspannungsdrosselspule
JP2001272201A (ja) * 2000-03-27 2001-10-05 Sony Precision Technology Inc 位置検出装置
DE10120236C1 (de) * 2001-04-19 2003-01-30 Siemens Ag Elektrische Wicklungsanordnung
DE10255710A1 (de) * 2002-11-29 2004-06-09 Hella Kg Hueck & Co. Induktiver Wegesensor
DE10342473B4 (de) * 2003-09-15 2011-04-28 Sick Ag Magnetischer Wegsensor
GB0707376D0 (en) * 2007-04-17 2007-05-23 Penny & Giles Controls Ltd Inductive sensors
DE102013200698A1 (de) * 2013-01-18 2014-07-24 Zf Friedrichshafen Ag Spulenanordnung mit zwei Spulen
KR102160324B1 (ko) 2013-02-01 2020-09-25 콘티넨탈 테베스 아게 운트 코. 오하게 감지 디바이스를 제조하기 위한 방법
DE102013203586A1 (de) 2013-03-01 2014-09-04 Continental Teves Ag & Co. Ohg Sensor zum Erfassen einer Position eines Gebermagneten

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1144347A (fr) * 1955-03-03 1957-10-11 Glanzstoff Ag Télé-indicateur de mesure
DE1299432B (de) * 1967-12-30 1969-07-17 Maurer Ludwig Verfahren und Vorrichtung zur Stellwegmessung bei einer mit einem Druckmedium beaufschlagten Kolben-zylinder-Einheit
DE2314050A1 (de) * 1973-03-21 1974-10-03 Philips Patentverwaltung Induktiver wegaufnehmer
GB1559091A (en) * 1976-11-24 1980-01-16 Marconi Co Ltd Position-voltage transducers
DE3109930A1 (de) * 1981-03-14 1982-09-23 Robert Bosch Gmbh, 7000 Stuttgart Weggeber
DE3303994A1 (de) * 1982-02-17 1983-08-25 Deutsche Itt Industries Gmbh, 7800 Freiburg Positionsmessvorrichtung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1144347A (fr) * 1955-03-03 1957-10-11 Glanzstoff Ag Télé-indicateur de mesure
DE1299432B (de) * 1967-12-30 1969-07-17 Maurer Ludwig Verfahren und Vorrichtung zur Stellwegmessung bei einer mit einem Druckmedium beaufschlagten Kolben-zylinder-Einheit
DE2314050A1 (de) * 1973-03-21 1974-10-03 Philips Patentverwaltung Induktiver wegaufnehmer
GB1559091A (en) * 1976-11-24 1980-01-16 Marconi Co Ltd Position-voltage transducers
DE3109930A1 (de) * 1981-03-14 1982-09-23 Robert Bosch Gmbh, 7000 Stuttgart Weggeber
DE3303994A1 (de) * 1982-02-17 1983-08-25 Deutsche Itt Industries Gmbh, 7800 Freiburg Positionsmessvorrichtung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0366227A2 (fr) * 1988-10-27 1990-05-02 Macome Corporation Appareil de mesure de déplacement
EP0366227A3 (fr) * 1988-10-27 1991-03-20 Macome Corporation Appareil de mesure de déplacement
WO1993004341A2 (fr) * 1991-08-24 1993-03-04 Robert Bosch Gmbh Dispositif de mesure pour la determination sans contact du deplacement ou de l'angle de rotation d'un composant
WO1993004341A3 (fr) * 1991-08-24 1993-05-27 Bosch Gmbh Robert Dispositif de mesure pour la determination sans contact du deplacement ou de l'angle de rotation d'un composant
US5331277A (en) * 1992-08-07 1994-07-19 Eldec Corporation Inductive divider position sensor with fixed and variable impedance inductors
US5453685A (en) * 1993-07-30 1995-09-26 Philips Electronics North America Corporation Inductive position sensing device and apparatus with selectable winding configuration

Also Published As

Publication number Publication date
DE3518772A1 (de) 1986-11-27
ES555294A0 (es) 1987-08-01
EP0221934A1 (fr) 1987-05-20
ES8707610A1 (es) 1987-08-01

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