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GB1320857A - Magnetic field monitoring devices - Google Patents

Magnetic field monitoring devices

Info

Publication number
GB1320857A
GB1320857A GB1383671*[A GB1383671A GB1320857A GB 1320857 A GB1320857 A GB 1320857A GB 1383671 A GB1383671 A GB 1383671A GB 1320857 A GB1320857 A GB 1320857A
Authority
GB
United Kingdom
Prior art keywords
magnet
gap
air
members
magneto
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
GB1383671*[A
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.)
Siemens Corp
Original Assignee
Siemens Corp
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 Siemens Corp filed Critical Siemens Corp
Publication of GB1320857A publication Critical patent/GB1320857A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
    • 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
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G01R33/09—Magnetoresistive devices

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Measuring Magnetic Variables (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

1320857 Magnetometers SIEMENS AG 7 May 1971 [22 May 1970] 13836/71 Heading G1N A magnetometer comprises a magnet 1 and a pair of magneto-resistors 6, 7 arranged on the neutral axis of the magnet 1 in respective flux paths defined by members 2, 3 and 4 arranged as shown to leave an air-gap at one end only of the magnet. The magnet may be a permanent magnet of ceramic oxide or other high reluctance material or may be an electromagnet. The flux path members are of low reluctance material and divert part of the field F being measured serially through members 2, 6, 4, 7 and 3. As shown the ends of members 2 and 3 adjacent the air-gap are bevelled. Flux collecting plates 13, 16 are provided. The apparatus is mounted for rotation about three perpendicular axes 5, 16 and 17. The magneto-resistors 6, 7 are connected in a bridge circuit, Fig. 2 (not shown) including an adjustable resistor (9). In a modification, Fig.4 (not shown) for sensing closely spaced magnetic areas of opposite polarity without the field of the magnet 1 interfering with the fields being sensed, the air-gap is narrower and parallel-sided and the magnet is notched in the region of the air-gap.
GB1383671*[A 1970-05-22 1971-05-07 Magnetic field monitoring devices Expired GB1320857A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702024997 DE2024997A1 (en) 1970-05-22 1970-05-22 Device for detecting magnetic fields

Publications (1)

Publication Number Publication Date
GB1320857A true GB1320857A (en) 1973-06-20

Family

ID=5771781

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1383671*[A Expired GB1320857A (en) 1970-05-22 1971-05-07 Magnetic field monitoring devices

Country Status (5)

Country Link
AT (1) AT311490B (en)
DE (1) DE2024997A1 (en)
ES (1) ES391424A1 (en)
FR (1) FR2090217B1 (en)
GB (1) GB1320857A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2202635A (en) * 1987-03-26 1988-09-28 Devon County Council Detection of magnetic fields
EP1184845A3 (en) * 2000-08-31 2003-01-22 Nec Corporation Magnetoresistive sensor, magnetoresistive head, and magnetic recording/reproducing apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4577250A (en) * 1981-12-18 1986-03-18 Victor Company Of Japan, Limited Hall effect magnetic head
NL8600390A (en) * 1986-02-17 1987-09-16 Philips Nv MAGNETIC HEAD WITH MAGNETIC RESISTANCE ELEMENT.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1392375A (en) * 1964-05-08 1965-03-12 Siemens Ag Magnetic field measuring device, comprising a resistance varying as a function of this field
DE1489088A1 (en) * 1964-10-30 1969-05-29 List Dipl Ing Heinrich Polarized electromagnetic propulsion system
DE1516964C3 (en) * 1966-04-21 1973-09-13 Siemens Ag, 1000 Berlin U. 8000 Muenchen Magnetic field probe for measuring more or less magnetic fields

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2202635A (en) * 1987-03-26 1988-09-28 Devon County Council Detection of magnetic fields
GB2202635B (en) * 1987-03-26 1991-10-30 Devon County Council Detection of magnetic fields
EP1184845A3 (en) * 2000-08-31 2003-01-22 Nec Corporation Magnetoresistive sensor, magnetoresistive head, and magnetic recording/reproducing apparatus
US6714374B1 (en) 2000-08-31 2004-03-30 Nec Corporation Magnetoresistive sensor, magnetoresistive head, and magnetic recording/reproducing apparatus

Also Published As

Publication number Publication date
FR2090217A1 (en) 1972-01-14
AT311490B (en) 1973-11-26
FR2090217B1 (en) 1974-10-11
DE2024997B2 (en) 1974-03-21
ES391424A1 (en) 1973-07-01
DE2024997A1 (en) 1972-01-27
DE2024997C3 (en) 1974-10-17

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee