JPH0441791B2 - - Google Patents

Info

Publication number
JPH0441791B2
JPH0441791B2 JP60012298A JP1229885A JPH0441791B2 JP H0441791 B2 JPH0441791 B2 JP H0441791B2 JP 60012298 A JP60012298 A JP 60012298A JP 1229885 A JP1229885 A JP 1229885A JP H0441791 B2 JPH0441791 B2 JP H0441791B2
Authority
JP
Japan
Prior art keywords
magnetic sensor
joint
sensor
pattern
cast iron
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 - Lifetime
Application number
JP60012298A
Other languages
English (en)
Japanese (ja)
Other versions
JPS61170689A (ja
Inventor
Hidekazu Sugai
Masumi Okada
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.)
Tokyo Gas Co Ltd
Original Assignee
Tokyo Gas Co 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 Tokyo Gas Co Ltd filed Critical Tokyo Gas Co Ltd
Priority to JP60012298A priority Critical patent/JPS61170689A/ja
Publication of JPS61170689A publication Critical patent/JPS61170689A/ja
Publication of JPH0441791B2 publication Critical patent/JPH0441791B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Geophysics And Detection Of Objects (AREA)
JP60012298A 1985-01-25 1985-01-25 埋設鋳鉄管の継手位置検知装置 Granted JPS61170689A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60012298A JPS61170689A (ja) 1985-01-25 1985-01-25 埋設鋳鉄管の継手位置検知装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60012298A JPS61170689A (ja) 1985-01-25 1985-01-25 埋設鋳鉄管の継手位置検知装置

Publications (2)

Publication Number Publication Date
JPS61170689A JPS61170689A (ja) 1986-08-01
JPH0441791B2 true JPH0441791B2 (de) 1992-07-09

Family

ID=11801418

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60012298A Granted JPS61170689A (ja) 1985-01-25 1985-01-25 埋設鋳鉄管の継手位置検知装置

Country Status (1)

Country Link
JP (1) JPS61170689A (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0515115Y2 (de) * 1986-11-04 1993-04-21
US5034690A (en) * 1988-04-01 1991-07-23 Taliaferro Sam W Method and apparatus for quantitatively determining whether at least one of two or more ferromagnetic components is missing from an assembly
JPWO2024185797A1 (de) * 2023-03-06 2024-09-12

Also Published As

Publication number Publication date
JPS61170689A (ja) 1986-08-01

Similar Documents

Publication Publication Date Title
US10983240B1 (en) Magnetic utility locator devices and methods
US4837489A (en) Magnetometer-based locator and identifier for ferrous objects having unknown shapes
JP4021321B2 (ja) 強磁性材料の応力測定
US7038444B2 (en) System and method for in-line stress measurement by continuous Barkhausen method
JP5004177B2 (ja) 磁気式移動体速度検出装置
US7804295B2 (en) Apparatus and method for detection of defects using flux leakage techniques
CA1208291A (en) Method and apparatus for detecting flaws in tubular metallic members
US20210132162A1 (en) Magnetic pig positioning system and method
JP2526578B2 (ja) 塗膜損傷検知方法
CN113970709A (zh) 一种地铁钢轨对地局部绝缘损坏点定位方法及系统
JPH01481A (ja) 塗膜損傷検知方法
JPH0441791B2 (de)
KR100602525B1 (ko) 다수개의 센서가 구비된 지하매설물 탐지기
JPH09133530A (ja) 車両用方位検出装置
JP3791889B2 (ja) 管内検査装置
JP2001255304A (ja) 埋設塗覆装配管の塗膜損傷位置検出方法
EP3719490B1 (de) Fehlermessvorrichtung, fehlermessverfahren und prüfsonde
JPH06325288A (ja) 車両検出装置及び交通量計測装置
JP2001349846A (ja) 管内検査装置の円周方向角度検出方法
RU2769074C1 (ru) Измерительное устройство
JPH0833299B2 (ja) 車両用方位計
JP2001255314A (ja) 管内検査装置
JPS6290508A (ja) 移動体方位検知装置
JPH03152411A (ja) 埋設管の信号電流及び埋設深さ検出装置
JP2002162224A (ja) 異形管の検出方法