DE3542030A1 - Evaluating electronics for differential capacitors - Google Patents

Evaluating electronics for differential capacitors

Info

Publication number
DE3542030A1
DE3542030A1 DE19853542030 DE3542030A DE3542030A1 DE 3542030 A1 DE3542030 A1 DE 3542030A1 DE 19853542030 DE19853542030 DE 19853542030 DE 3542030 A DE3542030 A DE 3542030A DE 3542030 A1 DE3542030 A1 DE 3542030A1
Authority
DE
Germany
Prior art keywords
comparators
evaluating electronics
differential capacitors
voltage
capacitors
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Withdrawn
Application number
DE19853542030
Other languages
German (de)
Inventor
R Prof Dr Ing Haberland
Bertold Dipl Ing Vogt
Kai Storjohann
Original Assignee
Haberland Ruediger Prof Dr Ing
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
Priority to DE19853516162 priority Critical patent/DE3516162A1/en
Application filed by Haberland Ruediger Prof Dr Ing filed Critical Haberland Ruediger Prof Dr Ing
Priority to DE19853542030 priority patent/DE3542030A1/en
Publication of DE3542030A1 publication Critical patent/DE3542030A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING 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
    • G01D5/00Mechanical 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
    • G01D5/12Mechanical 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
    • G01D5/14Mechanical 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
    • G01D5/24Mechanical 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
    • G01D5/241Mechanical 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
    • G01D5/2417Mechanical 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING 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
    • G01D5/00Mechanical 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
    • G01D5/12Mechanical 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
    • G01D5/14Mechanical 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
    • G01D5/24Mechanical 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
    • G01D5/241Mechanical 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
    • G01D5/2412Mechanical 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 overlap

Abstract

As already described in detail in Patent P 35161620, the stability of the measurement value of evaluating electronics for differential capacitors with a pulse-width-modulated squarewave output voltage, in which the individual capacitors are alternately charged, depends both on a stable squarewave voltage amplitude and on the equality and on the drift characteristics of the charging resistors and comparators. The instability caused by the comparators can be avoided in this invention by using only one comparator, the capacitor voltage Uc to be compared with a reference voltage Uref being picked up between charging resistor and change-over switch.
DE19853542030 1985-05-06 1985-11-28 Evaluating electronics for differential capacitors Withdrawn DE3542030A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19853516162 DE3516162A1 (en) 1985-05-06 1985-05-06 Evaluating electronics for differential capacitors for use in sensors
DE19853542030 DE3542030A1 (en) 1985-05-06 1985-11-28 Evaluating electronics for differential capacitors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853542030 DE3542030A1 (en) 1985-05-06 1985-11-28 Evaluating electronics for differential capacitors

Publications (1)

Publication Number Publication Date
DE3542030A1 true DE3542030A1 (en) 1986-10-09

Family

ID=25831994

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853542030 Withdrawn DE3542030A1 (en) 1985-05-06 1985-11-28 Evaluating electronics for differential capacitors

Country Status (1)

Country Link
DE (1) DE3542030A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0457515A1 (en) * 1990-05-11 1991-11-21 New Sd, Inc. Capacitive position detector
DE4103200A1 (en) * 1991-02-02 1992-08-06 Vdo Schindling Measurement transducer for physical parameters - has two sensors e.g. capacitive, inductive or resistor sensors, and changeover switch selecting on sensor at time for connection to evaluation circuit
DE4205989A1 (en) * 1992-02-27 1993-09-02 Mannesmann Kienzle Gmbh Circuit arrangement for a sensor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0457515A1 (en) * 1990-05-11 1991-11-21 New Sd, Inc. Capacitive position detector
US5122755A (en) * 1990-05-11 1992-06-16 New Sd, Inc. Capacitive position detector
DE4103200A1 (en) * 1991-02-02 1992-08-06 Vdo Schindling Measurement transducer for physical parameters - has two sensors e.g. capacitive, inductive or resistor sensors, and changeover switch selecting on sensor at time for connection to evaluation circuit
DE4205989A1 (en) * 1992-02-27 1993-09-02 Mannesmann Kienzle Gmbh Circuit arrangement for a sensor

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