GB2041532B - Metal detector - Google Patents

Metal detector

Info

Publication number
GB2041532B
GB2041532B GB7903297A GB7903297A GB2041532B GB 2041532 B GB2041532 B GB 2041532B GB 7903297 A GB7903297 A GB 7903297A GB 7903297 A GB7903297 A GB 7903297A GB 2041532 B GB2041532 B GB 2041532B
Authority
GB
United Kingdom
Prior art keywords
metal detector
detector
metal
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
GB7903297A
Other versions
GB2041532A (en
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.)
Plessey Co Ltd
Original Assignee
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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB7903297A priority Critical patent/GB2041532B/en
Publication of GB2041532A publication Critical patent/GB2041532A/en
Application granted granted Critical
Publication of GB2041532B publication Critical patent/GB2041532B/en
Expired 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
    • G01V3/08—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
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
    • G07D5/08—Testing the magnetic or electric properties
GB7903297A 1979-01-31 1979-01-31 Metal detector Expired GB2041532B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7903297A GB2041532B (en) 1979-01-31 1979-01-31 Metal detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7903297A GB2041532B (en) 1979-01-31 1979-01-31 Metal detector

Publications (2)

Publication Number Publication Date
GB2041532A GB2041532A (en) 1980-09-10
GB2041532B true GB2041532B (en) 1983-05-11

Family

ID=10502835

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7903297A Expired GB2041532B (en) 1979-01-31 1979-01-31 Metal detector

Country Status (1)

Country Link
GB (1) GB2041532B (en)

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4486713A (en) * 1981-09-28 1984-12-04 Gifford Jack D Metal detector apparatus utilizing controlled phase response to reject ground effects and to discriminate between different types of metals
US4517511A (en) * 1981-10-16 1985-05-14 Fairchild Camera And Instrument Corporation Current probe signal processing circuit employing sample and hold technique to locate circuit faults
GB8303587D0 (en) * 1983-02-09 1983-03-16 Chapman Cash Processing Ltd Coin discriminating apparatus
GB2135492B (en) * 1983-02-09 1986-06-04 Chapman Cash Processing Limite Coin recognition
US4600356A (en) * 1984-01-27 1986-07-15 Gas Research Institute Underground pipeline and cable detector and process
GB8407009D0 (en) * 1984-03-17 1984-04-18 Parkway Instr Co Operative Ltd Locating and detecting metal objects
FI79618C (en) * 1986-08-15 1990-01-10 Outokumpu Oy Methods and apparatus for detecting metal bodies
EP0274450A3 (en) * 1987-01-09 1989-08-02 Kolectric Limited A device for measuring the proximity of a metal object
GB8717493D0 (en) * 1987-07-23 1987-08-26 Scan Coin Ab Coin discriminator
WO1990000748A1 (en) * 1988-07-11 1990-01-25 Bayliss Electronic Industries Pty. Ltd. Metal/mineral detector with received signal sampling
US4982156A (en) * 1988-09-02 1991-01-01 Allied-Signal Inc. Position transducer apparatus and associated circuitry including pulse energized primary winding and pair of waveform sampled secondary windings
US5576624A (en) * 1989-01-12 1996-11-19 Bhc Consulting Pty Ltd. Pulse induction time domain metal detector
AU633536B2 (en) * 1989-01-12 1993-02-04 Minelab Electronics Pty Limited Metal detector
US5537041A (en) * 1989-03-29 1996-07-16 Bhc Consulting Pty Ltd Discriminating time domain conducting metal detector utilizing multi-period rectangular transmitted pulses
US5476168A (en) * 1990-07-05 1995-12-19 Microsystem Controls Pty Ltd Coin validator
AU660418B2 (en) * 1990-07-05 1995-06-29 Microsystem Controls Pty Ltd Coin validator
DE4224204C2 (en) * 1992-07-22 1998-08-06 Nsm Ag Device for determining the authenticity of coins
GB9217451D0 (en) * 1992-08-17 1992-09-30 Case Icc Limited Method and apparatus for coin discrimination
AUPM301993A0 (en) * 1993-12-17 1994-01-20 Microsystem Controls Pty Ltd Coin validator
DE4436318B4 (en) * 1994-10-11 2008-10-09 Nsm-Löwen Entertainment Gmbh Coin validator for determining the authenticity of coins
AT404408B (en) * 1994-12-23 1998-11-25 H Schiebel Elektronische Gerae METHOD AND DEVICE FOR EXAMINING A MEDIUM
DE19506339C2 (en) * 1995-02-23 1998-01-15 Klaus Ebinger Method and circuit device for the electromagnetic detection of objects
DE19518342A1 (en) * 1995-05-18 1996-11-21 Klaus Ebinger Ing Method and probe arrangement for the electromagnetic detection of metallic objects
DE19730952A1 (en) * 1997-07-18 1999-01-21 Klaus Ebinger Method and device for electromagnetic detection of objects
DE19838249A1 (en) * 1998-08-22 2000-02-24 M U T Gmbh Metallic and non-metallic particle sorting process comprises passing the particles through an alternating magnetic field to produce vortex streams which weaken the field and are detected by magneto-resistive sensors.
US6326791B1 (en) * 1999-05-19 2001-12-04 Geonics Limited Discrimination of metallic targets in magnetically susceptible soil
US6529007B2 (en) * 1999-08-04 2003-03-04 Ellen Ott Temperature compensation for ground piercing metal detector
US6326790B1 (en) * 1999-08-04 2001-12-04 Ellen Ott Ground piercing metal detector having range, bearing and metal-type discrimination
DE60106215T2 (en) * 2000-03-22 2005-04-28 The Johns Hopkins University ELECTROMAGNETIC SENSOR SYSTEM FOR OBJECT DISTINCTION AND METHOD FOR DISCOVERING AND IDENTIFYING METAL OBJECTS
US6583625B1 (en) * 2000-10-16 2003-06-24 Frl, Inc. Metal detector and method in which mineralization effects are eliminated
DE10213115A1 (en) * 2002-03-23 2003-10-16 Lorenz Roatzsch Detecting objects, especially metal objects, using individual pulse-induction probes to detect induction signals from objects and evaluating variations in induction signals emitted by object
EP1347311B1 (en) 2002-03-23 2012-02-08 Lorenz Roatzsch Method for detecting objects, particularly metal objects
JP6327037B2 (en) * 2014-07-23 2018-05-23 富士通株式会社 Control method and control program for variable gain amplifier
CA2911780A1 (en) * 2014-11-12 2016-05-12 Geonics Limited Device and method for detecting unexploded ordinance in mineralized soil

Also Published As

Publication number Publication date
GB2041532A (en) 1980-09-10

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19990130