FR2400706A1 - Extent of electrical conductor fissure opening measuring device - has differential amplifier, and oscillator controlled synchronising circuit for application and interruption of current flow - Google Patents

Extent of electrical conductor fissure opening measuring device - has differential amplifier, and oscillator controlled synchronising circuit for application and interruption of current flow

Info

Publication number
FR2400706A1
FR2400706A1 FR7725419A FR7725419A FR2400706A1 FR 2400706 A1 FR2400706 A1 FR 2400706A1 FR 7725419 A FR7725419 A FR 7725419A FR 7725419 A FR7725419 A FR 7725419A FR 2400706 A1 FR2400706 A1 FR 2400706A1
Authority
FR
France
Prior art keywords
electrical conductor
interruption
fissure
current flow
extent
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
FR7725419A
Other languages
French (fr)
Other versions
FR2400706B1 (en
Inventor
Georges Baudin
Humbert Policella
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.)
Office National dEtudes et de Recherches Aerospatiales ONERA
Original Assignee
Office National dEtudes et de Recherches Aerospatiales ONERA
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 Office National dEtudes et de Recherches Aerospatiales ONERA filed Critical Office National dEtudes et de Recherches Aerospatiales ONERA
Priority to FR7725419A priority Critical patent/FR2400706A1/en
Publication of FR2400706A1 publication Critical patent/FR2400706A1/en
Application granted granted Critical
Publication of FR2400706B1 publication Critical patent/FR2400706B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/20—Investigating the presence of flaws

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

The depth and length of an open fissure in surface of solid electrical conductor is determined by studying variations in electrical resistance. A constant current is circulated and voltage measurements made adjacent to the fissure. An electrical conductor (1) with fissure (f) is connected (2, 3) to constant current generator (4). Measuring contacts (5, 6) adjacent to fissue enable voltage to be sensed and applied to differential input amplifier (7). An oscillator (11) controlled sync. circuit (10) causes application and interruption of current flow and the measured voltage values are stored in memory of measuring circuit (8) for calculation and display of resistance value.
FR7725419A 1977-08-19 1977-08-19 Extent of electrical conductor fissure opening measuring device - has differential amplifier, and oscillator controlled synchronising circuit for application and interruption of current flow Granted FR2400706A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7725419A FR2400706A1 (en) 1977-08-19 1977-08-19 Extent of electrical conductor fissure opening measuring device - has differential amplifier, and oscillator controlled synchronising circuit for application and interruption of current flow

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7725419A FR2400706A1 (en) 1977-08-19 1977-08-19 Extent of electrical conductor fissure opening measuring device - has differential amplifier, and oscillator controlled synchronising circuit for application and interruption of current flow

Publications (2)

Publication Number Publication Date
FR2400706A1 true FR2400706A1 (en) 1979-03-16
FR2400706B1 FR2400706B1 (en) 1981-10-02

Family

ID=9194639

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7725419A Granted FR2400706A1 (en) 1977-08-19 1977-08-19 Extent of electrical conductor fissure opening measuring device - has differential amplifier, and oscillator controlled synchronising circuit for application and interruption of current flow

Country Status (1)

Country Link
FR (1) FR2400706A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2471601A1 (en) * 1979-12-14 1981-06-19 Commissariat Energie Atomique METHOD AND DEVICE FOR NON-DESTRUCTIVE CONTROL OF STITCHES
EP0707208A1 (en) 1994-10-12 1996-04-17 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "Snecma" Method and apparatus for simultaneously determining the crack opening extent and its temperature on the surface of a solid electrically conducting body

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2471601A1 (en) * 1979-12-14 1981-06-19 Commissariat Energie Atomique METHOD AND DEVICE FOR NON-DESTRUCTIVE CONTROL OF STITCHES
EP0030889B1 (en) * 1979-12-14 1984-04-18 COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et Industriel Method and device for the non destructive testing of spot welds
EP0707208A1 (en) 1994-10-12 1996-04-17 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "Snecma" Method and apparatus for simultaneously determining the crack opening extent and its temperature on the surface of a solid electrically conducting body
FR2725789A1 (en) * 1994-10-12 1996-04-19 Snecma DEVICE AND METHOD FOR SIMULTANEOUSLY MEASURING THE EXTENT AND TEMPERATURE OF A FISSURE ON THE SURFACE OF AN ELECTRICALLY CONDUCTIVE SOLID BODY
US5758970A (en) * 1994-10-12 1998-06-02 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "Snecma" Device and process for the simultaneous measurement of the extent and the temperature of a crack at the surface of an electrically conductive solid body
WO2004074826A1 (en) * 1994-10-12 2004-09-02 Jean-Pierre Aubert Device and method for the simultaneous measurement of the extent and temperature of a fissure in the surface of a solid electrically-conducting body

Also Published As

Publication number Publication date
FR2400706B1 (en) 1981-10-02

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