GB1340198A - Electromagnetic surveying instruments - Google Patents

Electromagnetic surveying instruments

Info

Publication number
GB1340198A
GB1340198A GB1340198DA GB1340198A GB 1340198 A GB1340198 A GB 1340198A GB 1340198D A GB1340198D A GB 1340198DA GB 1340198 A GB1340198 A GB 1340198A
Authority
GB
United Kingdom
Prior art keywords
tube
coils
area
nov
coil
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
Application number
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.)
Radiodetection Ltd
Original Assignee
Electrolocation 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 Electrolocation Ltd filed Critical Electrolocation Ltd
Publication of GB1340198A publication Critical patent/GB1340198A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • 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

Abstract

1340198 Electro-physical measurements ELECTROLOCATION Ltd 2 Nov 1971 [3 Nov 1970] 52185/70 Heading G1N In an electromagnetic surveying apparatus for use in plotting underground features of an area of ground between a pair of earth electrodes A.B. to which A. C. is applied the above ground field detector includes a pivotably mounted ferritecored coil. Two coils 10, 11 are mounted on tube 12 in bearings 13 which are pivoted about the horizontal axis 14 and rotatable about column 20. In use a series of readings are taken over the area and at each position the datum line of scale 21, for indicating rotation of tube 12 about column 20, is aligned parallel to A.B. using sighting bars 22 and then, with the coils connected in phase, the tube 12 is rotated about the vertical axis so that the meter 26 gives a null reading and the horizontal angle between A.B. and tube 12 read from scale 21. Adjustment about horizontal axis 14 may be made to obtain a null reading. The tube 12 may be turned to a position such that a maximum reading is obtained. If the coils are connected in antiphase the gradient of the e.m. field may be obtained. Measurements of the direction of the field enable mine shafts or metal pipes to be detected. Only one coil may be used to obtain readings over a small area.
GB1340198D 1970-11-03 1970-11-03 Electromagnetic surveying instruments Expired GB1340198A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5218570 1970-11-03

Publications (1)

Publication Number Publication Date
GB1340198A true GB1340198A (en) 1973-12-12

Family

ID=10462955

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1340198D Expired GB1340198A (en) 1970-11-03 1970-11-03 Electromagnetic surveying instruments

Country Status (1)

Country Link
GB (1) GB1340198A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4634977A (en) * 1982-12-27 1987-01-06 Honeywell Inc. High accuracy mapping of magnetic fields with a fiber optic interferometer
US4742300A (en) * 1982-12-27 1988-05-03 Honeywell Inc. High accuracy mapping of magnetic fields with a fiber optic interferometer
WO1999035514A1 (en) * 1998-01-07 1999-07-15 Gec-Marconi Rds Limited Detecting concealed objects
ITPD20080359A1 (en) * 2008-12-02 2010-06-03 Pietro Lucio Cosentino METHOD AND APPARATUS OF TOMOGRAPHIC DETECTION OF A RESISTIVITY DISTRIBUTION IN A MEANS.
EP2278358A1 (en) * 2009-07-22 2011-01-26 Leica Geosystems AG Method and system for detecting the proximity of a conductive, buried structure

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4634977A (en) * 1982-12-27 1987-01-06 Honeywell Inc. High accuracy mapping of magnetic fields with a fiber optic interferometer
US4742300A (en) * 1982-12-27 1988-05-03 Honeywell Inc. High accuracy mapping of magnetic fields with a fiber optic interferometer
WO1999035514A1 (en) * 1998-01-07 1999-07-15 Gec-Marconi Rds Limited Detecting concealed objects
ITPD20080359A1 (en) * 2008-12-02 2010-06-03 Pietro Lucio Cosentino METHOD AND APPARATUS OF TOMOGRAPHIC DETECTION OF A RESISTIVITY DISTRIBUTION IN A MEANS.
EP2278358A1 (en) * 2009-07-22 2011-01-26 Leica Geosystems AG Method and system for detecting the proximity of a conductive, buried structure
WO2011009808A3 (en) * 2009-07-22 2011-05-19 Leica Geosystems Ag Method and system for detecting the proximity of a conductive, buried structures
CN102472826A (en) * 2009-07-22 2012-05-23 莱卡地球系统公开股份有限公司 Proximity detection method and system
AU2010275283B2 (en) * 2009-07-22 2013-07-25 Cable Detection Limited Method and system for detecting the proximity of a conductive, buried structures
US8766639B2 (en) 2009-07-22 2014-07-01 Leica Geosystems Ag Proximity detection method and system
CN102472826B (en) * 2009-07-22 2014-12-17 莱卡地球系统公开股份有限公司 Proximity detection method and system for detecting conductive, embedded structure

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees