GB1351912A - Method and device for determining the depth of a magnetic anomaly - Google Patents

Method and device for determining the depth of a magnetic anomaly

Info

Publication number
GB1351912A
GB1351912A GB2728772A GB2728772A GB1351912A GB 1351912 A GB1351912 A GB 1351912A GB 2728772 A GB2728772 A GB 2728772A GB 2728772 A GB2728772 A GB 2728772A GB 1351912 A GB1351912 A GB 1351912A
Authority
GB
United Kingdom
Prior art keywords
magnetic
dipole
anomaly
aircraft
determined
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
GB2728772A
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
Publication of GB1351912A publication Critical patent/GB1351912A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00Arrangements or instruments for measuring magnetic variables
    • G01R33/02Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/022Measuring gradient
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/15Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for use during transport, e.g. by a person, vehicle or boat
    • G01V3/165Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for use during transport, e.g. by a person, vehicle or boat operating with magnetic or electric fields produced or modified by the object or by the detecting device

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Remote Sensing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Geophysics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

1351912 Magnetic surveying COMMISSARIAT A L'ENERGIE ATOMIQUE 12 June 1972 [16 June 1971] 27287/72 Heading G1N In aerial magnetic survey, the depth Zo of a submerged magnetic anomaly at least approximately comparable with a horizontal dipole (e.g. a submarine) is deduced by determining the variation in the perturbation H to the Earth's magnetic field caused by the anomaly and the variation in the gradient -#H/#u a long a horizontal path perpendicular or parallel to the dipole and calculating Zo using the formula where m = 1 if the path is parallel to the dipole or 1/3À5 if perpendicular. The path may be a circle centred at the origin of the anomaly or in the form of a fourleaved clover crossing the origin in directions parallel and perpendicular to the dipole. In Fig. 5, the output of a frequency meter 18 connected to a proton resonance magnetometer head 10 mounted in a tail extension of an aircraft is corrected for magnetic effects of the aircraft by subtracting at 20 the output of a phase meter 16 connected to a proton resonance filter 12. A bandpass filter 22 eliminates the constant components of the field so that only the perturbation H is recorded on a tape recorder 24. The output of filter 22 is sampled at 27 at regular intervals (e.g. 1 second) determined by a clock 30 and fed to a shift register 28. H max is determined by a comparison circuit 32 and (#H/#u) max is determined by a subtractor 34 and comparison circuit 36. Circuit 38 calculates Zo, using a manually set value of m. The aircraft's altitude may be fed in at 44 to be subtracted from Zo.
GB2728772A 1971-06-16 1972-06-12 Method and device for determining the depth of a magnetic anomaly Expired GB1351912A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7121778A FR2142181A5 (en) 1971-06-16 1971-06-16

Publications (1)

Publication Number Publication Date
GB1351912A true GB1351912A (en) 1974-05-15

Family

ID=9078728

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2728772A Expired GB1351912A (en) 1971-06-16 1972-06-12 Method and device for determining the depth of a magnetic anomaly

Country Status (5)

Country Link
CA (1) CA960305A (en)
DE (1) DE2229589C3 (en)
FR (1) FR2142181A5 (en)
GB (1) GB1351912A (en)
IT (1) IT959162B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2472183C1 (en) * 2011-08-15 2013-01-10 Открытое акционерное общество "Научно-производственное предприятие "Радар ммс" Method of searching for and identifying submarine vessels

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2552397C1 (en) * 1975-11-22 1986-05-07 Licentia Gmbh Arrangement of one or more magnetometer probes
FR2610418B1 (en) * 1987-01-30 1989-05-05 Commissariat Energie Atomique MAGNETIC METHOD FOR DETERMINING THE PATH OF A MOBILE OBJECT TO JOIN A MAGNETIC OBJECT, FIXED OR MOBILE, AND DEVICE FOR IMPLEMENTING THE METHOD
DE4000018C2 (en) * 1990-01-02 1997-11-20 Sengpiel Klaus Peter Dr Rigid-bonded sensor systems of rectangular transmitter and receiver coils for conducting electromagnetic soundings over the surface of a three-dimensional body, suspension devices for such sensor systems and methods for determining the conductivity distribution inside a body
FR2751417B1 (en) * 1990-02-01 1999-02-05 Sextant Avionique METHOD FOR IDENTIFYING THE MAGNETISM OF AN OBJECT AND DEVICE USING THE SAME
US5239474A (en) * 1990-11-20 1993-08-24 Hughes Aircraft Company Dipole moment detection and localization
US5387863A (en) * 1992-04-14 1995-02-07 Hughes Aircraft Company Synthetic aperture array dipole moment detector and localizer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2472183C1 (en) * 2011-08-15 2013-01-10 Открытое акционерное общество "Научно-производственное предприятие "Радар ммс" Method of searching for and identifying submarine vessels

Also Published As

Publication number Publication date
IT959162B (en) 1973-11-10
DE2229589A1 (en) 1973-01-04
DE2229589B2 (en) 1974-08-29
FR2142181A5 (en) 1973-01-26
DE2229589C3 (en) 1975-04-30
CA960305A (en) 1974-12-31

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PE20 Patent expired after termination of 20 years