JPS64481A - Detection of damage of coated film - Google Patents

Detection of damage of coated film

Info

Publication number
JPS64481A
JPS64481A JP62104650A JP10465087A JPS64481A JP S64481 A JPS64481 A JP S64481A JP 62104650 A JP62104650 A JP 62104650A JP 10465087 A JP10465087 A JP 10465087A JP S64481 A JPS64481 A JP S64481A
Authority
JP
Japan
Prior art keywords
magnetic field
recorder
outputted
converter
detection signal
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
JP62104650A
Other languages
Japanese (ja)
Other versions
JP2526578B2 (en
JPH01481A (en
Inventor
Akio Nagamune
Kazuo Sano
Takao Yamamura
Yosuke Amano
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.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan 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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP62104650A priority Critical patent/JP2526578B2/en
Publication of JPS64481A publication Critical patent/JPS64481A/en
Publication of JPH01481A publication Critical patent/JPH01481A/en
Application granted granted Critical
Publication of JP2526578B2 publication Critical patent/JP2526578B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

PURPOSE: To surely detect the damaged section of the coated film of an embedded conduit in a non-contact state by passing AC current to the embedded conduit, detecting the magnetic field component in the direction perpendicular to the pipe axis generated on the ground by means of plural magnetic field detectors and subjecting the same to a prescribed arithmetic processing.
CONSTITUTION: The AC current I is supplied between the embedded conduit 1 and an embedded ground electrode 4 so that the magnetic field is generated on the ground surface 6. Perpendicular and horizontal magnetic field detectors 21, 22 are mounted on a carriage 7. The detection signal S1 of the detector 21 is subjected to the prescribed arithmetic processing by a computing element 26 via an amplifier 23, a BPF 24 and an AC/DC converter 25 and is then outputted to a recorder 27. The detection signal S2 of the detector 22 is outputted to the recorder 27 via an amplifier 28, a BPF 29 and an AC/DC converter 30. Further, the potential difference detection signal S3 between the front and rear wheels of the carrier 7 detected and amplified by a differential amplifier 32 is outputted to the recorder 27 via a filter 3 and an AC/DC converter 34. The outputs of magnetic field sensors 30a, 30b are computed by the computing element 26 and the change in the magnetic field by the damage of the coated film is detected in such a manner.
COPYRIGHT: (C)1989,JPO&Japio
JP62104650A 1986-06-26 1987-04-30 Coating film damage detection method Expired - Lifetime JP2526578B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62104650A JP2526578B2 (en) 1986-06-26 1987-04-30 Coating film damage detection method

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP15045286 1986-06-26
JP61-150453 1986-06-26
JP61-150452 1986-06-26
JP61-160938 1986-07-10
JP61-252867 1986-10-24
JP62-23478 1987-02-05
JP62104650A JP2526578B2 (en) 1986-06-26 1987-04-30 Coating film damage detection method

Publications (3)

Publication Number Publication Date
JPS64481A true JPS64481A (en) 1989-01-05
JPH01481A JPH01481A (en) 1989-01-05
JP2526578B2 JP2526578B2 (en) 1996-08-21

Family

ID=26445082

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62104650A Expired - Lifetime JP2526578B2 (en) 1986-06-26 1987-04-30 Coating film damage detection method

Country Status (1)

Country Link
JP (1) JP2526578B2 (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04120456A (en) * 1990-09-11 1992-04-21 Hitachi Ltd Non-destructive testing equipment using SQUID
JPH06109862A (en) * 1992-09-30 1994-04-22 Tokyo Gas Co Ltd Detection method of target point in buried pipe
JPH09218174A (en) * 1996-02-09 1997-08-19 Takenaka Komuten Co Ltd Inspection method for photocatalyst film
JPH10206390A (en) * 1997-01-22 1998-08-07 Kawasaki Steel Corp Method for detecting damage to buried steel pipe coating
JPH1151907A (en) * 1997-08-04 1999-02-26 Tokyo Gas Co Ltd Method for locating damaged parts in concealed pipelines
JPH11118940A (en) * 1997-10-15 1999-04-30 Japan Radio Co Ltd Buried object detection device
JP2001194340A (en) * 2000-01-11 2001-07-19 Osaka Gas Co Ltd Measuring instrument for state of cathodic protection
JP2005134159A (en) * 2003-10-28 2005-05-26 Nippon Steel Corp Metal touch detection method for buried metal pipes.
JP2011007521A (en) * 2009-06-23 2011-01-13 Nippon Steel Pipeline Co Ltd Device and method for metal touch detection
JP2011145176A (en) * 2010-01-14 2011-07-28 Toyota Motor Corp Eddy current measuring sensor, and inspection method using the same
EP3236252A1 (en) * 2016-04-22 2017-10-25 Yokogawa Electric Corporation Thinning detection system and thinning detection method
EP3223010A4 (en) * 2014-11-21 2018-05-09 Konica Minolta, Inc. Magnetic flaw detection device and magnetic flaw detection method
JP2019015749A (en) * 2013-11-19 2019-01-31 ヒュン チャン リー Mobile electric leakage search device
EP3477294A4 (en) * 2016-06-28 2020-02-12 Hitachi High-tech Fine Systems Corporation RAIL INSPECTION SYSTEM
CN111337566A (en) * 2020-02-25 2020-06-26 清华大学 A method for edge recognition of defects in magnetic flux leakage detection

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005351626A (en) * 2004-06-08 2005-12-22 Shikoku Res Inst Inc Nondestructive inspection method and its device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51117088A (en) * 1975-04-05 1976-10-14 Nippon Kokan Kk <Nkk> Conductor detection method
JPS5311387B2 (en) * 1973-06-08 1978-04-21
JPS54147064A (en) * 1978-05-11 1979-11-16 Yasuyuki Nakashima Method of searching for buried electric wire
JPS56140276A (en) * 1980-04-02 1981-11-02 Nippon Telegr & Teleph Corp <Ntt> Measuring device of buried position of underground cable
JPS5756769A (en) * 1980-09-22 1982-04-05 Shimizu Kiko Kk Searcher for buried metallic pipe
JPS59162474A (en) * 1983-02-16 1984-09-13 マ−ク・イアン・ホウエル Electromagnetic surveying device for conductor
JPS6030895B2 (en) * 1976-10-04 1985-07-19 大阪瓦斯株式会社 Method for detecting coating abnormalities in buried pipes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5311387B2 (en) * 1973-06-08 1978-04-21
JPS51117088A (en) * 1975-04-05 1976-10-14 Nippon Kokan Kk <Nkk> Conductor detection method
JPS6030895B2 (en) * 1976-10-04 1985-07-19 大阪瓦斯株式会社 Method for detecting coating abnormalities in buried pipes
JPS54147064A (en) * 1978-05-11 1979-11-16 Yasuyuki Nakashima Method of searching for buried electric wire
JPS56140276A (en) * 1980-04-02 1981-11-02 Nippon Telegr & Teleph Corp <Ntt> Measuring device of buried position of underground cable
JPS5756769A (en) * 1980-09-22 1982-04-05 Shimizu Kiko Kk Searcher for buried metallic pipe
JPS59162474A (en) * 1983-02-16 1984-09-13 マ−ク・イアン・ホウエル Electromagnetic surveying device for conductor

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04120456A (en) * 1990-09-11 1992-04-21 Hitachi Ltd Non-destructive testing equipment using SQUID
JPH06109862A (en) * 1992-09-30 1994-04-22 Tokyo Gas Co Ltd Detection method of target point in buried pipe
JPH09218174A (en) * 1996-02-09 1997-08-19 Takenaka Komuten Co Ltd Inspection method for photocatalyst film
JPH10206390A (en) * 1997-01-22 1998-08-07 Kawasaki Steel Corp Method for detecting damage to buried steel pipe coating
JPH1151907A (en) * 1997-08-04 1999-02-26 Tokyo Gas Co Ltd Method for locating damaged parts in concealed pipelines
JPH11118940A (en) * 1997-10-15 1999-04-30 Japan Radio Co Ltd Buried object detection device
JP2001194340A (en) * 2000-01-11 2001-07-19 Osaka Gas Co Ltd Measuring instrument for state of cathodic protection
JP2005134159A (en) * 2003-10-28 2005-05-26 Nippon Steel Corp Metal touch detection method for buried metal pipes.
JP2011007521A (en) * 2009-06-23 2011-01-13 Nippon Steel Pipeline Co Ltd Device and method for metal touch detection
JP2011145176A (en) * 2010-01-14 2011-07-28 Toyota Motor Corp Eddy current measuring sensor, and inspection method using the same
US10996285B2 (en) 2013-11-19 2021-05-04 Hyun Chang Lee Method of detecting earth leaking point without interrupting a power supply
USRE50683E1 (en) 2013-11-19 2025-12-02 Hyun Chang Lee Method of detecting earth leaking point without interrupting a power supply
JP2019015749A (en) * 2013-11-19 2019-01-31 ヒュン チャン リー Mobile electric leakage search device
EP3223010A4 (en) * 2014-11-21 2018-05-09 Konica Minolta, Inc. Magnetic flaw detection device and magnetic flaw detection method
EP3236252A1 (en) * 2016-04-22 2017-10-25 Yokogawa Electric Corporation Thinning detection system and thinning detection method
US10458947B2 (en) 2016-04-22 2019-10-29 Yokogawa Electric Corporation Thinning detection system and thinning detection method
JP2017194404A (en) * 2016-04-22 2017-10-26 横河電機株式会社 Thinning detection system, thinning detection method
EP3477294A4 (en) * 2016-06-28 2020-02-12 Hitachi High-tech Fine Systems Corporation RAIL INSPECTION SYSTEM
CN111337566A (en) * 2020-02-25 2020-06-26 清华大学 A method for edge recognition of defects in magnetic flux leakage detection
CN111337566B (en) * 2020-02-25 2021-10-22 清华大学 A method for edge recognition of defects in magnetic flux leakage detection

Also Published As

Publication number Publication date
JP2526578B2 (en) 1996-08-21

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