FR2309833A1 - Capacitive gauge for measuring inside tube - has two capacitor plates on opposite arms of U-shaped spring - Google Patents

Capacitive gauge for measuring inside tube - has two capacitor plates on opposite arms of U-shaped spring

Info

Publication number
FR2309833A1
FR2309833A1 FR7513165A FR7513165A FR2309833A1 FR 2309833 A1 FR2309833 A1 FR 2309833A1 FR 7513165 A FR7513165 A FR 7513165A FR 7513165 A FR7513165 A FR 7513165A FR 2309833 A1 FR2309833 A1 FR 2309833A1
Authority
FR
France
Prior art keywords
shaped spring
capacitor plates
inside tube
plates
opposite arms
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
FR7513165A
Other languages
French (fr)
Other versions
FR2309833B1 (en
Inventor
Michel Combe
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.)
Electricite de France SA
Original Assignee
Electricite de France SA
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 Electricite de France SA filed Critical Electricite de France SA
Priority to FR7513165A priority Critical patent/FR2309833A1/en
Publication of FR2309833A1 publication Critical patent/FR2309833A1/en
Application granted granted Critical
Publication of FR2309833B1 publication Critical patent/FR2309833B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
    • G01B7/22—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in capacitance

Landscapes

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

Abstract

A capacitive gauge to measure an internal transverse dimension of a tube (1) has two capacitance plates (23, 24) on either side of a dielectric material (25) in contact with the dimension to be measured. A mutual capacitance measurement bridge is used. A U-shaped leaf spring (2) forms an internal gauge. The two arms of the spring have an insulating layer (21, 22) on their opposing faces, this layer being coated with a metalic film forming the compacitance plates. Two coaxial cables (32, 33) connect the leaf spring to a common earth point in the bridge circuit and also connect the capacitance plates to the bridge circuit.
FR7513165A 1975-04-28 1975-04-28 Capacitive gauge for measuring inside tube - has two capacitor plates on opposite arms of U-shaped spring Granted FR2309833A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7513165A FR2309833A1 (en) 1975-04-28 1975-04-28 Capacitive gauge for measuring inside tube - has two capacitor plates on opposite arms of U-shaped spring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7513165A FR2309833A1 (en) 1975-04-28 1975-04-28 Capacitive gauge for measuring inside tube - has two capacitor plates on opposite arms of U-shaped spring

Publications (2)

Publication Number Publication Date
FR2309833A1 true FR2309833A1 (en) 1976-11-26
FR2309833B1 FR2309833B1 (en) 1981-08-21

Family

ID=9154542

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7513165A Granted FR2309833A1 (en) 1975-04-28 1975-04-28 Capacitive gauge for measuring inside tube - has two capacitor plates on opposite arms of U-shaped spring

Country Status (1)

Country Link
FR (1) FR2309833A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088278A2 (en) * 1982-03-04 1983-09-14 INTERATOM Gesellschaft mit beschränkter Haftung Strain-measuring device
EP0225666A1 (en) * 1985-12-06 1987-06-16 Océ-Nederland B.V. A device for use in adjusting the distance between two parallel surfaces, and a method of adjusting such distance
WO2003056274A1 (en) * 2001-12-21 2003-07-10 Danfoss A/S Position sensor comprising elastomeric material
US6865960B2 (en) * 2001-03-30 2005-03-15 Siemens Aktiengesellschaft Capacitive microsystem for recording mechanical deformations, use and operating method
US7400080B2 (en) 2002-09-20 2008-07-15 Danfoss A/S Elastomer actuator and a method of making an actuator

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8181338B2 (en) 2000-11-02 2012-05-22 Danfoss A/S Method of making a multilayer composite
ATE384935T1 (en) 2001-12-21 2008-02-15 Danfoss As DIELECTRIC ACTUATOR OR SENSOR STRUCTURE AND PROCESS OF MANUFACTURING
DE602004014592D1 (en) 2003-02-24 2008-08-07 Danfoss As
US7880371B2 (en) 2006-11-03 2011-02-01 Danfoss A/S Dielectric composite and a method of manufacturing a dielectric composite
US7732999B2 (en) 2006-11-03 2010-06-08 Danfoss A/S Direct acting capacitive transducer
US8692442B2 (en) 2012-02-14 2014-04-08 Danfoss Polypower A/S Polymer transducer and a connector for a transducer
US8891222B2 (en) 2012-02-14 2014-11-18 Danfoss A/S Capacitive transducer and a method for manufacturing a transducer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088278A2 (en) * 1982-03-04 1983-09-14 INTERATOM Gesellschaft mit beschränkter Haftung Strain-measuring device
EP0088278A3 (en) * 1982-03-04 1984-07-04 Interatom Internationale Atomreaktorbau Gmbh Strain-measuring device
EP0225666A1 (en) * 1985-12-06 1987-06-16 Océ-Nederland B.V. A device for use in adjusting the distance between two parallel surfaces, and a method of adjusting such distance
US6865960B2 (en) * 2001-03-30 2005-03-15 Siemens Aktiengesellschaft Capacitive microsystem for recording mechanical deformations, use and operating method
WO2003056274A1 (en) * 2001-12-21 2003-07-10 Danfoss A/S Position sensor comprising elastomeric material
US7104146B2 (en) 2001-12-21 2006-09-12 Danfoss A/S Position sensor comprising elastomeric material
US7400080B2 (en) 2002-09-20 2008-07-15 Danfoss A/S Elastomer actuator and a method of making an actuator

Also Published As

Publication number Publication date
FR2309833B1 (en) 1981-08-21

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Legal Events

Date Code Title Description
ST Notification of lapse