FR2400702A1 - Mechanical state determining device for conducting material - has differential amplifier to measure resistance variation at various body locations - Google Patents

Mechanical state determining device for conducting material - has differential amplifier to measure resistance variation at various body locations

Info

Publication number
FR2400702A1
FR2400702A1 FR7725418A FR7725418A FR2400702A1 FR 2400702 A1 FR2400702 A1 FR 2400702A1 FR 7725418 A FR7725418 A FR 7725418A FR 7725418 A FR7725418 A FR 7725418A FR 2400702 A1 FR2400702 A1 FR 2400702A1
Authority
FR
France
Prior art keywords
conducting material
differential amplifier
determining device
state determining
various body
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
FR7725418A
Other languages
French (fr)
Other versions
FR2400702B1 (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 FR7725418A priority Critical patent/FR2400702A1/en
Publication of FR2400702A1 publication Critical patent/FR2400702A1/en
Application granted granted Critical
Publication of FR2400702B1 publication Critical patent/FR2400702B1/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
    • 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
    • G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

The mechanical condition of an electrically conducting material is determined from resistance variations at various locations on the body. This is achieved by measuring potential differences when constant current flows. A constant current flows through conducting material when constant current generator is commanded by an oscillator, controlled sync. circuit. Potential differences are measured by contacts at locations on conductor body. Ameasuring circuit stores values for processing from differential input amplifier connected to the contacts. These results are displayed to indicate mechanical condition of material.
FR7725418A 1977-08-19 1977-08-19 Mechanical state determining device for conducting material - has differential amplifier to measure resistance variation at various body locations Granted FR2400702A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7725418A FR2400702A1 (en) 1977-08-19 1977-08-19 Mechanical state determining device for conducting material - has differential amplifier to measure resistance variation at various body locations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7725418A FR2400702A1 (en) 1977-08-19 1977-08-19 Mechanical state determining device for conducting material - has differential amplifier to measure resistance variation at various body locations

Publications (2)

Publication Number Publication Date
FR2400702A1 true FR2400702A1 (en) 1979-03-16
FR2400702B1 FR2400702B1 (en) 1981-10-02

Family

ID=9194638

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7725418A Granted FR2400702A1 (en) 1977-08-19 1977-08-19 Mechanical state determining device for conducting material - has differential amplifier to measure resistance variation at various body locations

Country Status (1)

Country Link
FR (1) FR2400702A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2524147A1 (en) * 1982-03-25 1983-09-30 Cequad Solid material fatigue testing method for e.g. concrete bar - by comparing energy transfer conditions for different characteristic applied energies

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2524147A1 (en) * 1982-03-25 1983-09-30 Cequad Solid material fatigue testing method for e.g. concrete bar - by comparing energy transfer conditions for different characteristic applied energies

Also Published As

Publication number Publication date
FR2400702B1 (en) 1981-10-02

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Legal Events

Date Code Title Description
ST Notification of lapse