FR2303299A1 - Magnetic susceptibility sensor for geophysical applications - has detection coil placed between two AC excited windings and connected in an inductance bridge network - Google Patents

Magnetic susceptibility sensor for geophysical applications - has detection coil placed between two AC excited windings and connected in an inductance bridge network

Info

Publication number
FR2303299A1
FR2303299A1 FR7507220A FR7507220A FR2303299A1 FR 2303299 A1 FR2303299 A1 FR 2303299A1 FR 7507220 A FR7507220 A FR 7507220A FR 7507220 A FR7507220 A FR 7507220A FR 2303299 A1 FR2303299 A1 FR 2303299A1
Authority
FR
France
Prior art keywords
windings
detection coil
magnetic susceptibility
coil
bridge network
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
FR7507220A
Other languages
French (fr)
Other versions
FR2303299B1 (en
Inventor
Jean Bonnet
Julien Fournet
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Priority to FR7507220A priority Critical patent/FR2303299A1/en
Publication of FR2303299A1 publication Critical patent/FR2303299A1/en
Application granted granted Critical
Publication of FR2303299B1 publication Critical patent/FR2303299B1/fr
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
    • G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
    • G01V3/26—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device
    • G01V3/28—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device using induction coils

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)
  • Geophysics And Detection Of Objects (AREA)

Abstract

The method of measuring the magnetic susceptibility of the ground involves measuring an electrical signal emitted by a detection coil (19) placed between two AC windings (18a, 18b) connected in series and phase-opposed. The resultant flux in the coil is nul when the coil and the two windings are at a distance from any object, whether para-, dia-, or ferromagnetic in character. However, when these components are near such an object, the flux has a value and sign which depend on the object's characteristics. The coil and windings are placed within a sensor body. The detection coil (19) forms an arm in a mutual inductance measurement bridge. The windings (18a, 18b) are excited by a constant amplitude AC voltage at a frequency of about 18kHz.
FR7507220A 1975-03-07 1975-03-07 Magnetic susceptibility sensor for geophysical applications - has detection coil placed between two AC excited windings and connected in an inductance bridge network Granted FR2303299A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7507220A FR2303299A1 (en) 1975-03-07 1975-03-07 Magnetic susceptibility sensor for geophysical applications - has detection coil placed between two AC excited windings and connected in an inductance bridge network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7507220A FR2303299A1 (en) 1975-03-07 1975-03-07 Magnetic susceptibility sensor for geophysical applications - has detection coil placed between two AC excited windings and connected in an inductance bridge network

Publications (2)

Publication Number Publication Date
FR2303299A1 true FR2303299A1 (en) 1976-10-01
FR2303299B1 FR2303299B1 (en) 1977-10-21

Family

ID=9152276

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7507220A Granted FR2303299A1 (en) 1975-03-07 1975-03-07 Magnetic susceptibility sensor for geophysical applications - has detection coil placed between two AC excited windings and connected in an inductance bridge network

Country Status (1)

Country Link
FR (1) FR2303299A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2611054A1 (en) * 1987-02-16 1988-08-19 Veillon Jacques Method and device for measuring the dip of geological strata during drilling

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2011369A1 (en) * 1968-06-21 1970-02-27 Dresser Ind

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2011369A1 (en) * 1968-06-21 1970-02-27 Dresser Ind

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2611054A1 (en) * 1987-02-16 1988-08-19 Veillon Jacques Method and device for measuring the dip of geological strata during drilling

Also Published As

Publication number Publication date
FR2303299B1 (en) 1977-10-21

Similar Documents

Publication Publication Date Title
US4560928A (en) Velocity or distance measuring apparatus using magnetic dipoles
KR840002524A (en) Device for detecting metal body
US2418553A (en) Flux measuring system
ATE16532T1 (en) DEVICE FOR NON-DESTRUCTIVE MEASUREMENT OF THE HARDENING DEPTH OF MATERIALS.
DE3067910D1 (en) Method and apparatus for testing metal tapes
SU841610A3 (en) Electromagnetic gage sensitive to change of magnetic field
ATE139622T1 (en) DEVICE FOR INDUCTIVELY MEASURING THE POSITION OF A METAL STRIP
ES464263A1 (en) Electromagnetic detector responsive to a modification of a magnetic field
SE9502528D0 (en) Inductive measurement
GB1184912A (en) Magnetic Inspection method and means
FR2303299A1 (en) Magnetic susceptibility sensor for geophysical applications - has detection coil placed between two AC excited windings and connected in an inductance bridge network
US4463314A (en) Earth field compensation for a magnetic detector by imparting a permanent magnetization to a magnetic material contiguous the detector
GB573182A (en) Improvements in or relating to the detection of faults in articles of non-magnetic material
ES453283A1 (en) Identification system
ES8105099A1 (en) Method and apparatus for the identification of coins and equivalent
GB1070859A (en) Apparatus for the measurement of changes in diameter of wire or tubular metal and a method for the determination of the corrosion of such metal
SU605086A1 (en) Stuck-on eddy-current sensor
SU957139A1 (en) Magnetic field parameter measuring device
SU629516A1 (en) Magnetic field parameter measuring device
SU932385A1 (en) Device for eddy-current checking
SE8901037D0 (en) SET AND DEVICE FOR GENERATION OF MOVABLE MAGNIFICENT TABLE
SU742837A1 (en) Ferroprobe magnetometer
SU945632A1 (en) Device for checking ferromagnetic-based non-electroconductive coating thickness
SU987507A1 (en) Magnetic noise converter
SU693315A1 (en) Device for measuring magnetic susceptibility and conductivity of medium

Legal Events

Date Code Title Description
ST Notification of lapse