FR2425179A1 - Dispositif de controle a courants de foucault - Google Patents

Dispositif de controle a courants de foucault

Info

Publication number
FR2425179A1
FR2425179A1 FR7911157A FR7911157A FR2425179A1 FR 2425179 A1 FR2425179 A1 FR 2425179A1 FR 7911157 A FR7911157 A FR 7911157A FR 7911157 A FR7911157 A FR 7911157A FR 2425179 A1 FR2425179 A1 FR 2425179A1
Authority
FR
France
Prior art keywords
control device
current control
eddy current
signal
threshold
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
FR7911157A
Other languages
English (en)
Other versions
FR2425179B1 (fr
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.)
Honeywell Inc
Original Assignee
Honeywell Inc
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 Honeywell Inc filed Critical Honeywell Inc
Publication of FR2425179A1 publication Critical patent/FR2425179A1/fr
Application granted granted Critical
Publication of FR2425179B1 publication Critical patent/FR2425179B1/fr
Expired 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
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals

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)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

DISPOSITIF DE CONTROLE A COURANTS DE FOUCAULT POUR DISTINGUER DES SIGNAUX PARASITES DE SIGNAUX DE DEFAUTS. LE DISPOSITIF DE CONTROLE DE COURANTS DE FOUCAULT COMPREND UN CIRCUIT DISCRIMINATEUR CONSTITUE PAR DEUX CIRCUITS A SEUIL POUR DETECTER RESPECTIVEMENT DES DEVIATIONS POSITIVE ET NEGATIVE D'UN SIGNAL PROVENANT D'UNE SONDE, ET DES CIRCUITS CHRONOMETRIQUES POUR DETECTER QUAND LE SIGNAL DE SORTIE D'UN DES CIRCUITS A SEUIL SUIT UN SIGNAL DE SORTIE DE L'AUTRE CIRCUIT A SEUIL AVEC UN INTERVALLE DE TEMPS INFERIEUR A UNE VALEUR PREDETERMINEE. APPLICATION A LA DETECTION DE DEFAUTS DANS DES PIECES.
FR7911157A 1978-05-05 1979-05-03 Dispositif de controle a courants de foucault Expired FR2425179B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/903,268 US4193028A (en) 1978-05-05 1978-05-05 Eddy current instrumentation circuitry for distinguishing flaw signals from spurious noise signals

Publications (2)

Publication Number Publication Date
FR2425179A1 true FR2425179A1 (fr) 1979-11-30
FR2425179B1 FR2425179B1 (fr) 1986-06-27

Family

ID=25417207

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7911157A Expired FR2425179B1 (fr) 1978-05-05 1979-05-03 Dispositif de controle a courants de foucault

Country Status (5)

Country Link
US (1) US4193028A (fr)
CH (1) CH644952A5 (fr)
DE (1) DE2917788A1 (fr)
FR (1) FR2425179B1 (fr)
GB (1) GB2020433B (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414508A (en) * 1981-03-30 1983-11-08 Lockheed Corporation Method and apparatus for automated inspection of fastener holes by eddy current
DE3542159A1 (de) * 1985-11-28 1987-06-04 Nukem Gmbh Verfahren zur werkstoffpruefung nach dem wirbelstromprinzip und vorrichtung zur durchfuehrung des verfahrens
US4835486A (en) * 1986-04-28 1989-05-30 Burr-Brown Corporation Isolation amplifier with precise timing of signals coupled across isolation barrier
US4973913A (en) * 1990-02-08 1990-11-27 Mitsubishi Denki Kabushiki Kaisha Radiation measuring apparatus
US5287404A (en) * 1990-12-20 1994-02-15 Northern Telecom Limited Telephone subscriber line voltage change detection
US5212444A (en) * 1991-07-31 1993-05-18 Magnetek Controls Detection of damped sine waves in a magnestostrictive displacement transducer using pretrigger and detection thresholds of opposite polarity
US5444600A (en) * 1992-12-03 1995-08-22 Linear Technology Corporation Lead frame capacitor and capacitively-coupled isolator circuit using the same
US6816816B2 (en) * 2003-02-12 2004-11-09 Bently Nevada, Llc Transducer fault detection system using slew rate measurements: apparatus and method
CN103776899B (zh) * 2014-01-15 2016-08-31 华中科技大学 变脉宽激励的脉冲涡流检测方法
DE102014209602A1 (de) * 2014-05-20 2015-11-26 Magnetische Prüfanlagen Gmbh Prüfverfahren und Prüfvorrichtung zur zerstörungsfreien Werkstoffprüfung mittels Sonden-Array

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3273055A (en) * 1965-10-18 1966-09-13 Api Instr Company Constant impedance dual circuits for sample material flaw detection
FR2167707A1 (fr) * 1972-01-06 1973-08-24 Goring Kerr Ltd
DE2514135A1 (de) * 1974-04-11 1975-10-23 Asea Ab Anordnung zur verminderung von stoereinfluessen in messeinrichtungen zur anzeige bestimmter gegenstaende
FR2273288A1 (fr) * 1974-05-28 1975-12-26 Goodyear Tire & Rubber
FR2283425A1 (fr) * 1974-08-29 1976-03-26 Bosch Gmbh Robert Dispositif pour determiner la position d'un corps mobile
US3955102A (en) * 1973-11-21 1976-05-04 Digital Equipment Corporation Zero crossing detecting circuit

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2109455A (en) * 1938-03-01 Method and apparatus for detecting
US2511564A (en) * 1946-12-26 1950-06-13 Magnetic Analysis Corp Distortion analysis
US2657355A (en) * 1949-02-08 1953-10-27 John C Dionne Apparatus for the detection of flaws
US2617854A (en) * 1949-08-13 1952-11-11 Gen Electric Induced voltage flaw detector
US2614154A (en) * 1950-03-28 1952-10-14 John C Dionne Vertical split head detecting apparatus
US2869073A (en) * 1953-03-09 1959-01-13 Teleweld Inc Method and apparatus for distinguishing harmless surface flaws from dangerous fissures in magnetizable bodies
US2948848A (en) * 1955-07-01 1960-08-09 Svenska Metallverken Ab Fault detecting and indicating system
US2980848A (en) * 1956-12-24 1961-04-18 Shell Oil Co Weld seam testing apparatus
US3437917A (en) * 1966-12-13 1969-04-08 Southwest Res Inst Method of and apparatus for high speed magnetic inspection of tubular goods

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3273055A (en) * 1965-10-18 1966-09-13 Api Instr Company Constant impedance dual circuits for sample material flaw detection
FR2167707A1 (fr) * 1972-01-06 1973-08-24 Goring Kerr Ltd
US3955102A (en) * 1973-11-21 1976-05-04 Digital Equipment Corporation Zero crossing detecting circuit
DE2514135A1 (de) * 1974-04-11 1975-10-23 Asea Ab Anordnung zur verminderung von stoereinfluessen in messeinrichtungen zur anzeige bestimmter gegenstaende
FR2273288A1 (fr) * 1974-05-28 1975-12-26 Goodyear Tire & Rubber
FR2283425A1 (fr) * 1974-08-29 1976-03-26 Bosch Gmbh Robert Dispositif pour determiner la position d'un corps mobile

Also Published As

Publication number Publication date
US4193028A (en) 1980-03-11
GB2020433A (en) 1979-11-14
GB2020433B (en) 1982-08-04
DE2917788A1 (de) 1979-11-08
CH644952A5 (de) 1984-08-31
FR2425179B1 (fr) 1986-06-27

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Legal Events

Date Code Title Description
ST Notification of lapse
ST Notification of lapse