JPS56110048A - Detector for detecting turbulence flaw - Google Patents

Detector for detecting turbulence flaw

Info

Publication number
JPS56110048A
JPS56110048A JP1226780A JP1226780A JPS56110048A JP S56110048 A JPS56110048 A JP S56110048A JP 1226780 A JP1226780 A JP 1226780A JP 1226780 A JP1226780 A JP 1226780A JP S56110048 A JPS56110048 A JP S56110048A
Authority
JP
Japan
Prior art keywords
coils
flaws
inspected
straight line
detected
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.)
Pending
Application number
JP1226780A
Other languages
Japanese (ja)
Inventor
Shoji Hayashibe
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.)
HARA DENSHI SOKKI KK
Eddio Corp
Original Assignee
HARA DENSHI SOKKI KK
Eddio Corp
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 HARA DENSHI SOKKI KK, Eddio Corp filed Critical HARA DENSHI SOKKI KK
Priority to JP1226780A priority Critical patent/JPS56110048A/en
Publication of JPS56110048A publication Critical patent/JPS56110048A/en
Pending 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
    • G01N27/904—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 with two or more 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

PURPOSE:To detect, with excellent S/N ratio, flaws in the form of surface-layer cracks of a material having wave-form concavo-convexes on the surface to be detected by arranging appropriately two coils having linear conductor side parts. CONSTITUTION:The device is constituted by plane coils 1 and 2 formed of two square-loop coils having equal elements, and the linear conductor side parts 1a and 2a of each coil are arranged longitudinally in such a manner that they are lined up on a straight line B at a prescribed interval. While this positional relation between the coils 1 and 2 being kept unchanged, the parts 1a and 2a are opposed to the surface 3a to be detected of a material 3 to be inspected and further the sweeping direction of the coils 1 and 2 or the moving direction A of the material 3 to be inspected is made parallel with the straight line B. The difference in the change of impedance between the coils 1 and 2 caused by the flaws is taken out effectively without being offset.
JP1226780A 1980-02-04 1980-02-04 Detector for detecting turbulence flaw Pending JPS56110048A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1226780A JPS56110048A (en) 1980-02-04 1980-02-04 Detector for detecting turbulence flaw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1226780A JPS56110048A (en) 1980-02-04 1980-02-04 Detector for detecting turbulence flaw

Publications (1)

Publication Number Publication Date
JPS56110048A true JPS56110048A (en) 1981-09-01

Family

ID=11800583

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1226780A Pending JPS56110048A (en) 1980-02-04 1980-02-04 Detector for detecting turbulence flaw

Country Status (1)

Country Link
JP (1) JPS56110048A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58110851U (en) * 1982-01-22 1983-07-28 新日本製鐵株式会社 Electromagnetic induction detection device
US4704577A (en) * 1986-04-18 1987-11-03 Westinghouse Electric Corp. Eddy currents probe for measuring a gap between a tube and an antivibration bar
US4827216A (en) * 1987-03-25 1989-05-02 Grimson E G Differential triple-coil tester for wire rope with periodic lay effect cancellation
JP2007078654A (en) * 2005-09-16 2007-03-29 Tohoku Univ Nondestructive inspection apparatus using teleguidance type alternate potential

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3395339A (en) * 1966-01-21 1968-07-30 Atomic Energy Commission Usa Toroidal eddy current nondestructive testing probe

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3395339A (en) * 1966-01-21 1968-07-30 Atomic Energy Commission Usa Toroidal eddy current nondestructive testing probe

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58110851U (en) * 1982-01-22 1983-07-28 新日本製鐵株式会社 Electromagnetic induction detection device
US4704577A (en) * 1986-04-18 1987-11-03 Westinghouse Electric Corp. Eddy currents probe for measuring a gap between a tube and an antivibration bar
US4827216A (en) * 1987-03-25 1989-05-02 Grimson E G Differential triple-coil tester for wire rope with periodic lay effect cancellation
JP2007078654A (en) * 2005-09-16 2007-03-29 Tohoku Univ Nondestructive inspection apparatus using teleguidance type alternate potential

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