JPS5766354A - Eddy current flaw detector - Google Patents

Eddy current flaw detector

Info

Publication number
JPS5766354A
JPS5766354A JP55141755A JP14175580A JPS5766354A JP S5766354 A JPS5766354 A JP S5766354A JP 55141755 A JP55141755 A JP 55141755A JP 14175580 A JP14175580 A JP 14175580A JP S5766354 A JPS5766354 A JP S5766354A
Authority
JP
Japan
Prior art keywords
detecting
coil
absolute
coils
differential
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
JP55141755A
Other languages
Japanese (ja)
Other versions
JPS6259776B2 (en
Inventor
Yasuo Araki
Takeo Kamimura
Tomofumi Sakurai
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP55141755A priority Critical patent/JPS5766354A/en
Publication of JPS5766354A publication Critical patent/JPS5766354A/en
Publication of JPS6259776B2 publication Critical patent/JPS6259776B2/ja
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
    • G01N27/72—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 improve simultaneity of a flaw detecting signal and precision of flaw detection, by a method wherein a magnetic field, which absolute method detecting coils emanate, is utilized for differential method detecting coils, and a dummy coil, shielded with a metal ring, is connected to the absolute method detecting coil. CONSTITUTION:Absolute detecting coils 4, 25 and differential coils 2, 3 are coaxially located at a probe 1. The absolute detecting coil 4 is positioned in the proximity of the middle of the differential detecting ciols 2 and 3, and the absolute coil (dummy coil) 25 is placed at a position allowing it to be spaced enoughly away from the detecting coils 2, 3, and 4 and is shielded with a metal ring 26. As a result, a magnetic field, which the detecting coil emanates, does not reach a wall of a pipe 6 to be measured. If the probe 1 is inserted into a pipe 6 to be measured, the differential detecting coils 2 and 3 are influenced by the magnetic field, which the absolute detecting coils emanate, to detect a flaw detecting signal, and thereby the signals, transmitted by an absolute method and a differential method, are obtained simultaneously. Additionally, the change in temperture and an electrostatic capacity, can be removed, because an absolute detect coil (dummy coil) 25 is provided in the coil of the absolute detecting coil.
JP55141755A 1980-10-09 1980-10-09 Eddy current flaw detector Granted JPS5766354A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55141755A JPS5766354A (en) 1980-10-09 1980-10-09 Eddy current flaw detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55141755A JPS5766354A (en) 1980-10-09 1980-10-09 Eddy current flaw detector

Publications (2)

Publication Number Publication Date
JPS5766354A true JPS5766354A (en) 1982-04-22
JPS6259776B2 JPS6259776B2 (en) 1987-12-12

Family

ID=15299432

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55141755A Granted JPS5766354A (en) 1980-10-09 1980-10-09 Eddy current flaw detector

Country Status (1)

Country Link
JP (1) JPS5766354A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003522937A (en) * 1999-12-23 2003-07-29 ケーエルエー−テンカー テクノロジィース コーポレイション Monitoring metallization in real-time using eddy current or optical measurements

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003522937A (en) * 1999-12-23 2003-07-29 ケーエルエー−テンカー テクノロジィース コーポレイション Monitoring metallization in real-time using eddy current or optical measurements

Also Published As

Publication number Publication date
JPS6259776B2 (en) 1987-12-12

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