GB2226636B - Apparatus for sensing the movement of a local magnetic object. - Google Patents

Apparatus for sensing the movement of a local magnetic object.

Info

Publication number
GB2226636B
GB2226636B GB8828353A GB8828353A GB2226636B GB 2226636 B GB2226636 B GB 2226636B GB 8828353 A GB8828353 A GB 8828353A GB 8828353 A GB8828353 A GB 8828353A GB 2226636 B GB2226636 B GB 2226636B
Authority
GB
United Kingdom
Prior art keywords
sensing
movement
local magnetic
magnetic object
local
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 - Fee Related
Application number
GB8828353A
Other versions
GB2226636A (en
GB8828353D0 (en
Inventor
Julian Nolan Gannaway
Robert Charles Minchin
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.)
Roke Manor Research Ltd
Plessey Co Ltd
Original Assignee
Roke Manor Research Ltd
Plessey Co 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 Roke Manor Research Ltd, Plessey Co Ltd filed Critical Roke Manor Research Ltd
Priority to GB8828353A priority Critical patent/GB2226636B/en
Publication of GB8828353D0 publication Critical patent/GB8828353D0/en
Publication of GB2226636A publication Critical patent/GB2226636A/en
Application granted granted Critical
Publication of GB2226636B publication Critical patent/GB2226636B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/965—Switches controlled by moving an element forming part of the switch
    • H03K17/97—Switches controlled by moving an element forming part of the switch using a magnetic movable element
    • 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
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
    • G01V3/104—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled 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)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
GB8828353A 1988-12-05 1988-12-05 Apparatus for sensing the movement of a local magnetic object. Expired - Fee Related GB2226636B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8828353A GB2226636B (en) 1988-12-05 1988-12-05 Apparatus for sensing the movement of a local magnetic object.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8828353A GB2226636B (en) 1988-12-05 1988-12-05 Apparatus for sensing the movement of a local magnetic object.

Publications (3)

Publication Number Publication Date
GB8828353D0 GB8828353D0 (en) 1989-01-05
GB2226636A GB2226636A (en) 1990-07-04
GB2226636B true GB2226636B (en) 1993-01-27

Family

ID=10647973

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8828353A Expired - Fee Related GB2226636B (en) 1988-12-05 1988-12-05 Apparatus for sensing the movement of a local magnetic object.

Country Status (1)

Country Link
GB (1) GB2226636B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9019013D0 (en) * 1990-08-31 1990-10-17 Gec Ferranti Defence Syst A moving magnetic field detector
GB2280802A (en) * 1993-07-17 1995-02-08 Sabed Ltd An improved detector circuit
AU2003204534A1 (en) * 2002-06-28 2004-01-22 James E Cotter Apparatus for detecting metal objects being put into a trash can

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1458977A (en) * 1972-12-04 1976-12-22 Check Mate Systems Inc System and method for detecting unauthorized removal of goods from protected premises and magnet detecting apparatus suitable for use therein
GB1497867A (en) * 1974-12-31 1978-01-12 Plessey Co Ltd Security system for surveying an area
US4147973A (en) * 1976-12-20 1979-04-03 Weber Harold J Frequency dependent amplitude modulated translator apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1458977A (en) * 1972-12-04 1976-12-22 Check Mate Systems Inc System and method for detecting unauthorized removal of goods from protected premises and magnet detecting apparatus suitable for use therein
GB1497867A (en) * 1974-12-31 1978-01-12 Plessey Co Ltd Security system for surveying an area
US4147973A (en) * 1976-12-20 1979-04-03 Weber Harold J Frequency dependent amplitude modulated translator apparatus

Also Published As

Publication number Publication date
GB2226636A (en) 1990-07-04
GB8828353D0 (en) 1989-01-05

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee