ES477752A1 - Compensating Capacitive Transducer Measurements - Google Patents

Compensating Capacitive Transducer Measurements

Info

Publication number
ES477752A1
ES477752A1 ES477752A ES477752A ES477752A1 ES 477752 A1 ES477752 A1 ES 477752A1 ES 477752 A ES477752 A ES 477752A ES 477752 A ES477752 A ES 477752A ES 477752 A1 ES477752 A1 ES 477752A1
Authority
ES
Spain
Prior art keywords
transducer
demodulator
compensation
generator
capacitive transducer
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.)
Expired
Application number
ES477752A
Other languages
Spanish (es)
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.)
Bendix Corp
Original Assignee
Bendix Corp
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 Bendix Corp filed Critical Bendix Corp
Publication of ES477752A1 publication Critical patent/ES477752A1/en
Expired legal-status Critical Current

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
    • G01D5/24—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
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/0072—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance
    • G01L9/0075—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance using a ceramic diaphragm, e.g. alumina, fused quartz, glass
    • 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
    • G01L9/0082—Transmitting or indicating the displacement of capsules by electric, electromechanical, magnetic, or electromechanical means
    • G01L9/0086—Transmitting or indicating the displacement of capsules by electric, electromechanical, magnetic, or electromechanical means using variations in capacitance
    • 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
    • G01L9/125—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 with temperature compensating means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

A measuring circuit comprises a capacitive transducer 18, a frequency generator 10 for supplying an alternating carrier voltage, a quad diode demodulator 12 electrically connected to the generator 10 and to the transducer 18 such that the demodulator 12 generates an output signal representative of a parameter effecting the transducer 18 and a compensation network 16 connected to the frequency generator 10 for varying the amplitude of the carrier voltage oppositely to the amplitude changes in the output signal produced by compensatable errors of the demodulator and transducer. As shown the compensation network 16 comprises a ratiometre compensation circuit 24 and temperature compensation for the demodulator. Alternatively linearizing and temperature compensation in respect of the transducer may be applied to the generator (Fig. 3 not shown).
ES477752A 1978-02-15 1979-02-15 Compensating Capacitive Transducer Measurements Expired ES477752A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US87805678A 1978-02-15 1978-02-15

Publications (1)

Publication Number Publication Date
ES477752A1 true ES477752A1 (en) 1979-10-16

Family

ID=25371286

Family Applications (1)

Application Number Title Priority Date Filing Date
ES477752A Expired ES477752A1 (en) 1978-02-15 1979-02-15 Compensating Capacitive Transducer Measurements

Country Status (8)

Country Link
JP (2) JPS54115175A (en)
AU (1) AU521105B2 (en)
CA (1) CA1123225A (en)
DE (1) DE2905463A1 (en)
ES (1) ES477752A1 (en)
FR (1) FR2417887B1 (en)
GB (1) GB2015162B (en)
IT (1) IT1111910B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295376A (en) * 1978-12-01 1981-10-20 Besco Industries, Inc. Force responsive transducer
US4288835A (en) * 1979-04-16 1981-09-08 The Bendix Corporation Pressure sensor
US4322977A (en) * 1980-05-27 1982-04-06 The Bendix Corporation Pressure measuring system
US4509007A (en) * 1982-09-30 1985-04-02 Ibm Corporation Differential sensor measuring apparatus and method including sensor compensator circuitry
FR2632069B1 (en) * 1988-05-30 1990-12-14 Garcia Manuel IMPEDANCE VARIATION SPEED DETECTION SENSOR OR IMPEDANCE VARIATION SPEED

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3318153A (en) * 1962-12-04 1967-05-09 Rosemount Eng Co Ltd Diode loop capacitor comparative circuit including a pair of transformer windings coupled in phase
US3271669A (en) * 1962-12-04 1966-09-06 Rosemount Eng Co Ltd Alternating current diode loop capacitance measurement circuits
GB1110943A (en) * 1963-10-01 1968-04-24 Sangamo Weston Improvements in or relating to electrical bridge networks
US3646538A (en) * 1969-10-27 1972-02-29 Rosemount Eng Co Ltd Transducer circuitry for converting a capacitance signal to a dc current signal
US3648165A (en) * 1970-09-24 1972-03-07 Sun Oil Co Capacitance-measuring apparatus including means maintaining the voltage across the unknown capacitance constant
US3883812A (en) * 1971-12-20 1975-05-13 Nasa Diode-quad bridge circuit means
US3869672A (en) * 1972-05-13 1975-03-04 Int Standard Electric Corp Method and arrangements for the digital control of operating functions, radio and television receivers
DE2314754C2 (en) * 1973-03-24 1979-02-08 Hottinger Baldwin Messtechnik Gmbh, 6100 Darmstadt Electrical multi-point measuring device
JPS5144662A (en) * 1974-10-08 1976-04-16 Masakichi Kawahara
JPS5252676A (en) * 1975-10-24 1977-04-27 Yokogawa Hokushin Electric Corp Capacity-to-electricity converter

Also Published As

Publication number Publication date
IT1111910B (en) 1986-01-13
DE2905463A1 (en) 1979-08-16
AU521105B2 (en) 1982-03-18
GB2015162B (en) 1982-08-18
JPS6344731Y2 (en) 1988-11-21
AU4365579A (en) 1979-08-23
FR2417887A1 (en) 1979-09-14
DE2905463C2 (en) 1989-12-28
JPS6396415U (en) 1988-06-22
GB2015162A (en) 1979-09-05
JPS54115175A (en) 1979-09-07
FR2417887B1 (en) 1985-06-07
CA1123225A (en) 1982-05-11
IT7920175A0 (en) 1979-02-14

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