CA2046344A1 - Arrangement for processing sensor signals - Google Patents

Arrangement for processing sensor signals

Info

Publication number
CA2046344A1
CA2046344A1 CA2046344A CA2046344A CA2046344A1 CA 2046344 A1 CA2046344 A1 CA 2046344A1 CA 2046344 A CA2046344 A CA 2046344A CA 2046344 A CA2046344 A CA 2046344A CA 2046344 A1 CA2046344 A1 CA 2046344A1
Authority
CA
Canada
Prior art keywords
sensor
measuring
capacitors
input
capacitance
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.)
Granted
Application number
CA2046344A
Other languages
French (fr)
Other versions
CA2046344C (en
Inventor
Georg Schneider
Richard Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser SE and Co KG
Original Assignee
Georg Schneider
Richard Wagner
Endress U. Hauser Gmbh U. Co.
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 Georg Schneider, Richard Wagner, Endress U. Hauser Gmbh U. Co. filed Critical Georg Schneider
Publication of CA2046344A1 publication Critical patent/CA2046344A1/en
Application granted granted Critical
Publication of CA2046344C publication Critical patent/CA2046344C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/0072—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance
    • 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
    • G01D5/24—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 capacitance
    • G01D5/241—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 capacitance by relative movement of capacitor electrodes
    • G01D5/2417—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 capacitance by relative movement of capacitor electrodes by varying separation
    • 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
    • G01L9/12—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 by making use of variations in capacitance, i.e. electric circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Measuring Fluid Pressure (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)

Abstract

The arrangement serves for the processing of sensor signals which are furnished by a capacitive sensor which includes a measuring capacitor having a measuring capacitance influenceable by a physical measured quantity to be determined and at least one reference capacitor having a reference capacitance influenceable in another manner and furnishing a measuring effect dependent on the measuring capacitance and the reference capacitance. The arrangement comprises a signal processing circuit which operates by the principle of quantized charge transport by means of switch-capacitor structures and charge balancing at least in time average and which receives the sensor signals representing the measuring effect and furnishes an output signal corresponding to the measuring effect. The first electrodes of the capacitors of the sensor are at a fixed potential and their second electrodes are connectable for performing the charge transport to the first input of an input operational amplifier, the second input of which lies at a reference potential. The reverse charging of the capacitors of the sensor necessary for forming the transported charge packets is effected by switching over the reference potential of the input operational amplifier. This permits a one-sided fixed binding of the sensor capacitors to any desired potential.
CA002046344A 1989-12-20 1990-12-11 Arrangement for processing sensor signals Expired - Fee Related CA2046344C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19893942159 DE3942159A1 (en) 1989-12-20 1989-12-20 ARRANGEMENT FOR PROCESSING SENSOR SIGNALS
DEP3942159.7 1989-12-20
PCT/EP1990/002124 WO1991009278A1 (en) 1989-12-20 1990-12-11 Arrangement for processing sensor signals

Publications (2)

Publication Number Publication Date
CA2046344A1 true CA2046344A1 (en) 1991-06-21
CA2046344C CA2046344C (en) 2000-03-07

Family

ID=6395937

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002046344A Expired - Fee Related CA2046344C (en) 1989-12-20 1990-12-11 Arrangement for processing sensor signals

Country Status (8)

Country Link
EP (1) EP0458931B1 (en)
JP (1) JP2515456B2 (en)
CA (1) CA2046344C (en)
DE (2) DE3942159A1 (en)
DK (1) DK0458931T3 (en)
ES (1) ES2051584T3 (en)
IE (1) IE904484A1 (en)
WO (1) WO1991009278A1 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4133426A1 (en) * 1991-10-09 1993-04-15 Bosch Gmbh Robert Capacitive sensor circuit providing measurement and function test - has dual mode operation with bridge measurement and separate test voltage for checking functional performance via reference capacitor
FR2682768A1 (en) * 1991-10-21 1993-04-23 Otic Fischer & Porter METHODS OF CONVERTING IMPEDANCE REPORTS APPLICABLE TO MEASURING DEVICES, IN PARTICULAR TO INDUSTRIAL PRESSURE TRANSMITTERS, AND THEIR IMPLEMENTING DEVICES.
DE4225113C2 (en) * 1992-07-30 1995-05-04 Erhardt & Leimer Gmbh Device for monitoring a running web
DE4227052C1 (en) * 1992-08-13 1994-03-10 Schmidt Werner Dr Non-contact capacitive sensor for scanning of labels on carrier - processes frequency-modulated signal by demodulator with post-controlled carrier reference frequency, amplifier, low=pass filter, and voltage-controlled filter which outputs both to trigger, and to peak detector in feedback circuit
DE4237196C1 (en) * 1992-11-04 1994-02-10 Vega Grieshaber Gmbh & Co Method and arrangement for measuring at least one capacitance
DE4434338C2 (en) * 1994-09-26 1996-12-19 Siemens Ag Readout circuit for a capacitive sensor
DE19744152A1 (en) * 1997-10-07 1999-04-29 Ifm Electronic Gmbh Circuit arrangement for detecting the capacitance or a change in capacitance of a capacitive circuit or component
DE19711215C1 (en) 1997-03-18 1998-05-07 Heidenhain Gmbh Dr Johannes Method of switching between different output signal types of position measuring device
DE19833211C2 (en) 1998-07-23 2000-05-31 Siemens Ag Method for determining very small capacities and use
DE19833210C2 (en) * 1998-07-23 2000-06-21 Siemens Ag Amplifier circuit for measuring capacitance
JP3588276B2 (en) * 1999-07-26 2004-11-10 株式会社山武 Sensor signal processing circuit
JP2003028607A (en) 2001-07-12 2003-01-29 Sony Corp Capacitance detector and fingerprint collation apparatus using the same
EP1830182A1 (en) * 2006-02-22 2007-09-05 Glaverbel Laminated glazing
EP2228628B1 (en) * 2009-03-10 2011-09-28 EM Microelectronic-Marin SA Electronic circuit with a capacitive sensor for measuring a physical parameter, and method for activating the electronic circuit
DE102009057439B4 (en) 2009-10-27 2012-09-27 Gerd Reime Device and method for error-free capacitive measured value acquisition
WO2011097249A1 (en) * 2010-02-02 2011-08-11 Mks Instruments, Inc. Capacitive pressure sensor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4039940A (en) * 1976-07-30 1977-08-02 General Electric Company Capacitance sensor
US4128985A (en) * 1977-10-31 1978-12-12 Package Machinery Company Control system for package making machine
DE3125927A1 (en) * 1981-07-01 1983-01-20 Herbert Dipl.-Ing. 6240 Königstein Niedecker METHOD FOR FILLING AND SEALING SAUSAGES

Also Published As

Publication number Publication date
ES2051584T3 (en) 1994-06-16
WO1991009278A1 (en) 1991-06-27
DE59005540D1 (en) 1994-06-01
CA2046344C (en) 2000-03-07
IE904484A1 (en) 1991-07-03
DE3942159A1 (en) 1991-06-27
EP0458931B1 (en) 1994-04-27
EP0458931A1 (en) 1991-12-04
JP2515456B2 (en) 1996-07-10
DK0458931T3 (en) 1994-07-25
JPH04503713A (en) 1992-07-02

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Legal Events

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EEER Examination request
MKLA Lapsed