JPS5724853A - Eddy current type flaw detector - Google Patents

Eddy current type flaw detector

Info

Publication number
JPS5724853A
JPS5724853A JP10257480A JP10257480A JPS5724853A JP S5724853 A JPS5724853 A JP S5724853A JP 10257480 A JP10257480 A JP 10257480A JP 10257480 A JP10257480 A JP 10257480A JP S5724853 A JPS5724853 A JP S5724853A
Authority
JP
Japan
Prior art keywords
coils
work
eddy current
breakage
strand
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
JP10257480A
Other languages
Japanese (ja)
Inventor
Shoji Hayashibe
Hisao Horibe
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 JP10257480A priority Critical patent/JPS5724853A/en
Publication of JPS5724853A publication Critical patent/JPS5724853A/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 satisfactory S/N ratio, breakage of strand while being used as an overhead stranded wire, by employing two coils of the same specification, such as rectangular and annular coils whose generating magnetic field distributes uniformly to a relatively long range in a particular direction. CONSTITUTION:This is to consist of rectangular coils 1 and 2 each of which is annular and has a side longer than outside diameter of an object to be detected, and these coils 1 and 2 are of the same specification and are arranged in such positions that their respective sides being longer than the work 3 become parallel with each other. It is also necessary to give such a consideration to arrangement of the coils that the sides being longer than the work 3 are to become perpendicular to axial direction of the work 3 and axes of the coils 1 and 2 become to face a flaw-seeking face 3a of the work 3. As distribution of the eddy current to be induced to the work 3 passes annularly in the neighborhood of the flaw-searching face 3a, influence by contact resistance between strands can be minimized. On the other hand, if location of breakage of strand falls immediate under axis of a coil, the eddy current becomes largely disturbed and impedance of the coil changes remarkably. And therefore, it is possible, by using this mechanism, to detect, with satisfactory S/N ratio, breakage of strand while being used as an overhead stranded wire.
JP10257480A 1980-07-21 1980-07-21 Eddy current type flaw detector Pending JPS5724853A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10257480A JPS5724853A (en) 1980-07-21 1980-07-21 Eddy current type flaw detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10257480A JPS5724853A (en) 1980-07-21 1980-07-21 Eddy current type flaw detector

Publications (1)

Publication Number Publication Date
JPS5724853A true JPS5724853A (en) 1982-02-09

Family

ID=14330990

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10257480A Pending JPS5724853A (en) 1980-07-21 1980-07-21 Eddy current type flaw detector

Country Status (1)

Country Link
JP (1) JPS5724853A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01113647A (en) * 1987-10-27 1989-05-02 Furukawa Electric Co Ltd:The Method of detecting flaw of aluminum-coated steel stranded wire
JPH0254166A (en) * 1988-08-18 1990-02-23 Showa Electric Wire & Cable Co Ltd Flaw detection device of aerial cable
JPH06294776A (en) * 1993-04-08 1994-10-21 Railway Technical Res Inst Detecting device for break of strand of stranded wire
JP2007271607A (en) * 2006-03-07 2007-10-18 Tokyo Electric Power Co Inc:The Abnormality detection device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53106087A (en) * 1977-02-28 1978-09-14 Toshiba Corp Method and apparatus of eddy current ultrasonic flaw detection

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53106087A (en) * 1977-02-28 1978-09-14 Toshiba Corp Method and apparatus of eddy current ultrasonic flaw detection

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01113647A (en) * 1987-10-27 1989-05-02 Furukawa Electric Co Ltd:The Method of detecting flaw of aluminum-coated steel stranded wire
JPH0254166A (en) * 1988-08-18 1990-02-23 Showa Electric Wire & Cable Co Ltd Flaw detection device of aerial cable
JPH06294776A (en) * 1993-04-08 1994-10-21 Railway Technical Res Inst Detecting device for break of strand of stranded wire
JP2007271607A (en) * 2006-03-07 2007-10-18 Tokyo Electric Power Co Inc:The Abnormality detection device

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