FR2481459B1 - - Google Patents
Info
- Publication number
- FR2481459B1 FR2481459B1 FR8108576A FR8108576A FR2481459B1 FR 2481459 B1 FR2481459 B1 FR 2481459B1 FR 8108576 A FR8108576 A FR 8108576A FR 8108576 A FR8108576 A FR 8108576A FR 2481459 B1 FR2481459 B1 FR 2481459B1
- Authority
- FR
- France
- 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
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
- G01V3/02—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current
- G01V3/06—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current using ac
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8014094 | 1980-04-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2481459A1 FR2481459A1 (fr) | 1981-10-30 |
FR2481459B1 true FR2481459B1 (fr) | 1984-11-02 |
Family
ID=10513072
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8108576A Granted FR2481459A1 (fr) | 1980-04-29 | 1981-04-29 | Dispositif de detection de conducteurs dissimules transportant du courant, tels que cables ou conduites enterres, destine au perfectionnement des instruments de relevement |
Country Status (4)
Country | Link |
---|---|
US (1) | US4427942A (fr) |
JP (1) | JPS57572A (fr) |
DE (1) | DE3117021A1 (fr) |
FR (1) | FR2481459A1 (fr) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8304330D0 (en) * | 1983-02-16 | 1983-03-23 | Howell M I | Electromagnetic surveying of pipes and cables |
CA1244083A (fr) * | 1985-07-25 | 1988-11-01 | George Gee | Detecteur de corps ferromagnetiques |
DE3714009A1 (de) * | 1987-04-27 | 1988-11-10 | Hauni Werke Koerber & Co Kg | Metalldetektor |
US4818944A (en) * | 1987-05-06 | 1989-04-04 | Schonstedt Instrument Company | Magnetic locating and tracing system and method using dual-antenna transmitter to distinguish between concealed adjacent objects |
US5093622A (en) * | 1989-03-17 | 1992-03-03 | Minnesota Mining And Manufacturing Company | Method and apparatus for determining direction to and position of an underground conductor |
US5065098A (en) * | 1990-06-18 | 1991-11-12 | The Charles Machine Works, Inc. | System for locating concealed underground objects using digital filtering |
US5194816A (en) * | 1990-10-19 | 1993-03-16 | Westinghouse Electric Corp. | Method and apparatus for locating electrical shorts between concealed conductive objects |
CA2073266A1 (fr) * | 1991-07-09 | 1993-01-10 | Mehmet Rona | Systeme de ciblage distal |
US5365163A (en) * | 1992-09-29 | 1994-11-15 | Minnesota Mining And Manufacturing Company | Sensor array for circuit tracer |
US5471143A (en) * | 1993-01-29 | 1995-11-28 | Minnesota Mining And Manufacturing Co. | Apparatus for locating buried conductors using phase-shifted signals |
US5430379A (en) * | 1993-08-27 | 1995-07-04 | Minnesota Mining And Manufacturing Company | Conductor locator adapter for electronic markers |
US5670882A (en) * | 1995-09-21 | 1997-09-23 | Magnawand Inc. | Ferrous target identification system with magnetic field polarity and gradient indication |
US6407550B1 (en) * | 1998-08-19 | 2002-06-18 | Metrotech Corporation | Line locator with accurate horizontal displacement detection |
US6130539A (en) * | 1998-08-19 | 2000-10-10 | Metrotech Corporation | Automatic gain control for a line locator |
US6633163B2 (en) * | 1999-04-28 | 2003-10-14 | Radiodetection Limited | Apparatus and method for detecting an underground cable while operating a piece of machinery |
DE19925760C2 (de) * | 1999-06-05 | 2003-02-20 | Hagenuk Kmt Kabelmestechnik Gm | Vorrichtung zur Bestimmung einer Einfallsrichtung von elektromagnetischen Wellen |
GB0013620D0 (en) * | 2000-06-06 | 2000-07-26 | Howell Mark I | A technique for finding the position and depth of any buried pipeline or cable accurately, even where it may be lying close to other long buried conductors |
US6529006B1 (en) | 2001-10-31 | 2003-03-04 | Paul Hayes | Method and apparatus for resolving the position and identity of buried conductive bodies |
US6977508B2 (en) * | 2003-03-31 | 2005-12-20 | Radiodetection Limited | Cable detection apparatus and method |
US7671576B2 (en) * | 2008-03-06 | 2010-03-02 | Zircon Corporation | Ratiometric AC wire tracer |
US9568529B2 (en) | 2014-10-03 | 2017-02-14 | Ipeg Corporation | Dual orientation buried asset locator device |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS499388B1 (fr) * | 1968-05-25 | 1974-03-04 | ||
JPS5070054A (fr) * | 1973-10-24 | 1975-06-11 | ||
US3893025A (en) * | 1974-02-01 | 1975-07-01 | Plosser George G | Apparatus for determining the distance to a concealed conductive structure |
GB2006438B (en) * | 1977-08-02 | 1982-03-24 | Electricity Council | Portable apparatus for identifying on locating electric conductors |
GB2004069B (en) * | 1977-08-20 | 1982-04-21 | Plessey Co Ltd | Metal detectors |
GB2041531B (en) * | 1979-01-29 | 1983-09-14 | British Gas Corp | Detecting inaccessible objects |
-
1981
- 1981-04-21 US US06/256,232 patent/US4427942A/en not_active Expired - Lifetime
- 1981-04-28 JP JP6508981A patent/JPS57572A/ja active Pending
- 1981-04-29 DE DE19813117021 patent/DE3117021A1/de active Granted
- 1981-04-29 FR FR8108576A patent/FR2481459A1/fr active Granted
Also Published As
Publication number | Publication date |
---|---|
US4427942A (en) | 1984-01-24 |
DE3117021C2 (fr) | 1987-11-12 |
JPS57572A (en) | 1982-01-05 |
DE3117021A1 (de) | 1982-02-18 |
FR2481459A1 (fr) | 1981-10-30 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |