GB991890A - Improvements relating to search coil assemblies for eddy current testing - Google Patents

Improvements relating to search coil assemblies for eddy current testing

Info

Publication number
GB991890A
GB991890A GB43940/60A GB4394060A GB991890A GB 991890 A GB991890 A GB 991890A GB 43940/60 A GB43940/60 A GB 43940/60A GB 4394060 A GB4394060 A GB 4394060A GB 991890 A GB991890 A GB 991890A
Authority
GB
United Kingdom
Prior art keywords
coils
coil
eddy current
current testing
output
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
GB43940/60A
Inventor
Frederick Robert Bareham
John Martin Magar-Shack
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.)
British Non Ferrous Metals Research Association
Original Assignee
British Non Ferrous Metals Research Association
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 British Non Ferrous Metals Research Association filed Critical British Non Ferrous Metals Research Association
Priority to GB43940/60A priority Critical patent/GB991890A/en
Priority to CH1487461A priority patent/CH386560A/en
Publication of GB991890A publication Critical patent/GB991890A/en
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
    • G01N27/9006—Details, e.g. in the structure or functioning of sensors

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)

Abstract

991, 890. Eddy current testing apparatus. BRITISH NON-FERROUS METALS RESEARCH ASSOCIATION. Dec. 21, 1961 [Dec. 21, 1960], No. 43940/60. Heading G1N. A coil assembly for eddy current testing comprises a pair of coil sandwiches each having a primary coil 10 sandwiched between a pair of coils 12, 14 which may all be single turn coils of 0. 002 inch axial length, the coils being screened by discs 16,18 of magnetic material of high permeability. The coils 12, 14 of each sandwich are connected in series phase-assisting and the outputs of the two sandwiches are connected differentially to give a null response in the absence of a flaw. The assembly with tubular insulated spacers is secured by thin paper discs impregnated with an adhesive epoxy resin. Each coil is an annular copper disc having a radial slit and tapered lugs for external connection, and the magnetic screens are also slit radially to reduce hysteresis losses. The primary coils are fed by a 10 kc/s oscillator through a 15 watt amplifier, and the output from the coils 12, 14 after amplification in a frequency selective amplifier 32, is balanced to give a null output in a balancing unit 33 fed also from amplifier 28 in the absence of a flow. The output is applied to a recorder 36 via a phase sensitive detector 35. The arrangement may be passed through a tube or may be passed over a rod or a plane surface.
GB43940/60A 1960-12-21 1960-12-21 Improvements relating to search coil assemblies for eddy current testing Expired GB991890A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB43940/60A GB991890A (en) 1960-12-21 1960-12-21 Improvements relating to search coil assemblies for eddy current testing
CH1487461A CH386560A (en) 1960-12-21 1961-12-21 Apparatus for the verification of a sample of conductive material by eddy currents

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB43940/60A GB991890A (en) 1960-12-21 1960-12-21 Improvements relating to search coil assemblies for eddy current testing

Publications (1)

Publication Number Publication Date
GB991890A true GB991890A (en) 1965-05-12

Family

ID=10431033

Family Applications (1)

Application Number Title Priority Date Filing Date
GB43940/60A Expired GB991890A (en) 1960-12-21 1960-12-21 Improvements relating to search coil assemblies for eddy current testing

Country Status (2)

Country Link
CH (1) CH386560A (en)
GB (1) GB991890A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3532969A (en) * 1968-02-20 1970-10-06 Nat Lead Co Method for magnetically measuring wall thickness of metal pipes and plate structures
US3723860A (en) * 1971-03-29 1973-03-27 A Lovlya Magnetic sensor for defects utilizing split ring coils and having means for draining scale therefrom
US3963980A (en) * 1973-08-29 1976-06-15 Jury Mikhailovich Shkarlet Ultrasonic instrument for non-destructive testing of articles with current-conducting surface
US3976936A (en) * 1974-02-23 1976-08-24 Nihon Densokki Kabushiki Kaisha Non-destructive metal inspection apparatus using a sharp-pointed pin and coil for producing eddy currents in the inspected article
US3988665A (en) * 1974-05-29 1976-10-26 Institut Dr. Friedrich Forster, Prufgeratebau Eddy current test coil assembly using printed circuit conductor means
US4002967A (en) * 1975-08-01 1977-01-11 Aluminum Company Of America Annular eddy current test coil with magnetic laminations adjacent a limited circumferential extent
US4475083A (en) * 1977-09-19 1984-10-02 Studsvik Energiteknik Ab Method and apparatus for electromagnetically measuring parameters of electrically conductive high temperature materials
EP0468905A1 (en) * 1990-07-25 1992-01-29 Vallourec Industries Method and device for eddy-current testing of metal tubes during hot-rolling

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3532969A (en) * 1968-02-20 1970-10-06 Nat Lead Co Method for magnetically measuring wall thickness of metal pipes and plate structures
US3723860A (en) * 1971-03-29 1973-03-27 A Lovlya Magnetic sensor for defects utilizing split ring coils and having means for draining scale therefrom
US3963980A (en) * 1973-08-29 1976-06-15 Jury Mikhailovich Shkarlet Ultrasonic instrument for non-destructive testing of articles with current-conducting surface
US3976936A (en) * 1974-02-23 1976-08-24 Nihon Densokki Kabushiki Kaisha Non-destructive metal inspection apparatus using a sharp-pointed pin and coil for producing eddy currents in the inspected article
US3988665A (en) * 1974-05-29 1976-10-26 Institut Dr. Friedrich Forster, Prufgeratebau Eddy current test coil assembly using printed circuit conductor means
US4002967A (en) * 1975-08-01 1977-01-11 Aluminum Company Of America Annular eddy current test coil with magnetic laminations adjacent a limited circumferential extent
US4475083A (en) * 1977-09-19 1984-10-02 Studsvik Energiteknik Ab Method and apparatus for electromagnetically measuring parameters of electrically conductive high temperature materials
EP0468905A1 (en) * 1990-07-25 1992-01-29 Vallourec Industries Method and device for eddy-current testing of metal tubes during hot-rolling
FR2665263A1 (en) * 1990-07-25 1992-01-31 Vallourec Ind METHOD AND DEVICE FOR CONTROLLING DEFECTS OF METAL TUBES DURING HOT ROLLING BY EDGE CURRENTS.

Also Published As

Publication number Publication date
CH386560A (en) 1965-01-15

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