GB1436900A - Metal detector - Google Patents

Metal detector

Info

Publication number
GB1436900A
GB1436900A GB2467173A GB2467173A GB1436900A GB 1436900 A GB1436900 A GB 1436900A GB 2467173 A GB2467173 A GB 2467173A GB 2467173 A GB2467173 A GB 2467173A GB 1436900 A GB1436900 A GB 1436900A
Authority
GB
United Kingdom
Prior art keywords
loops
metal
switch
wing
receiver
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
GB2467173A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB1436900A publication Critical patent/GB1436900A/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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Electromagnetism (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

1436900 Metal detectors S HEYTOW 23 May 1973 [26 May 1972] 24671/73 Heading G1N A metal detector comprises a transmitter loop 26 transformer-coupled to a transistor oscillator 34, and two receiver loops 24, 28, spaced either side of the transmitter and connected via transformers 62, 64 in series opposition. A voltmeter 75 is connected to the receiver transformers to indicate the passage of a metal object through the loops. Details:- (i) each loop is preferably a single turn and is tuned to resonance by capacitors such as 66, 68. (ii) The coil assembly is mounted in a PORTABLE passage-way through which people or objects pass Figs. 1, 7 (not shown). (iii) A sheet metal MAGNETIC SCREEN is provided around the coils. (iv) "wing-loops" 58, 60 energized from a tapping on the oscillator coil, through switch 46 are mounted in space quadrature with the main loops Fig. 1 (not shown). The loops are switched in according to the direction of travel to eliminate the double hum response. Figs. 9, 10 (not shown). (v) discrimination is assisted by a "bias" introduced into the loops by a metal fin (78) Fig. 3 (not shown) mounted on the switch arm to couple one or the other set of loops. (vi) Initial balance, with switch 46 on the midde stud 54 (no wing loops), is set by a plate (81) Fig. 3 (not shown) adjustable to compensate for metal adjacent the test station.
GB2467173A 1972-05-26 1973-05-23 Metal detector Expired GB1436900A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25733472A 1972-05-26 1972-05-26

Publications (1)

Publication Number Publication Date
GB1436900A true GB1436900A (en) 1976-05-26

Family

ID=22975874

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2467173A Expired GB1436900A (en) 1972-05-26 1973-05-23 Metal detector

Country Status (8)

Country Link
JP (1) JPS4963462A (en)
CA (1) CA1080821A (en)
DE (1) DE2326797A1 (en)
ES (1) ES415206A1 (en)
FR (1) FR2189756B1 (en)
GB (1) GB1436900A (en)
IL (1) IL42338A (en)
IT (1) IT990589B (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2224849A (en) * 1988-11-01 1990-05-16 Outokumpu Oy Metal detector
GB2232254A (en) * 1989-05-30 1990-12-05 Barkley & Dexter Lab Inc Search coil assembly for metal detectors and method for making such an assembly
WO1991004502A1 (en) * 1989-09-12 1991-04-04 Bayliss Electronic Industries Pty. Ltd. Induced field mineral value detector
WO1992001956A1 (en) * 1990-07-20 1992-02-06 John Lysaght (Australia) Limited Strip position sensor
GB2249634A (en) * 1990-11-07 1992-05-13 Gec Ferranti Defence Syst Security system for a vehicle
DE10157770C1 (en) * 2001-11-27 2002-11-07 Mustafa Uzman Metal detector with increased operating efficiency due to provision of a voltage tap between the driving oscillator circuit and the transmitter coil so that magnetic field strength can be optimized
US8278918B2 (en) 2010-10-07 2012-10-02 Mettler-Toledo Safeline Limited Method for operating of a metal detection system and metal detection system
US8314713B2 (en) 2010-10-07 2012-11-20 Mettler-Toledo Safeline Limited Method for monitoring the operation of a metal detection system and metal detection system
EP2562565A1 (en) * 2011-08-24 2013-02-27 Mettler-Toledo Safeline Limited Metal Detection Apparatus
US8587301B2 (en) 2010-10-07 2013-11-19 Mettler-Toledo Safeline Limited Method for operating a metal detection system and metal detection system
US9018935B2 (en) 2011-09-19 2015-04-28 Mettler-Toledo Safeline Limited Method for operating a metal detection apparatus and apparatus
EP3098597A2 (en) * 2014-01-20 2016-11-30 Lenz Instruments S.L. Method for determining quality parameters in meat products, and corresponding system
WO2019215458A1 (en) * 2018-05-11 2019-11-14 The University Of Manchester Metal detector and method of manufacturing the same

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2510764A1 (en) * 1981-07-30 1983-02-04 Franquet Leon Firearms detector for protected zones - uses pair of coils supplied by AC source and alternately acting has EM field emitters and receivers to obtain uniform sensitivity
JPS5889876U (en) * 1981-12-11 1983-06-17 株式会社杉山電機製作所 metal passing detector
US4751516A (en) * 1985-01-10 1988-06-14 Lichtblau G J Antenna system for magnetic and resonant circuit detection
US4769631A (en) * 1986-06-30 1988-09-06 Sensormatic Electronics Corporation Method, system and apparatus for magnetic surveillance of articles
EP0424371A1 (en) * 1988-07-08 1991-05-02 Zetetic International Limited Method and apparatus for selectively detecting objects
DE20200759U1 (en) * 2002-01-19 2002-04-04 Maier & Fabris GmbH, 72072 Tübingen Device for the detection of metal objects

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1623104B2 (en) * 1967-06-23 1974-09-12 Clamann & Grahnert, X 8016 Dresden Coil system for metal detector
US3665298A (en) * 1970-01-05 1972-05-23 Erico Prod Inc Metal impurity detector for tubular conveyor system

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2224849A (en) * 1988-11-01 1990-05-16 Outokumpu Oy Metal detector
GB2224849B (en) * 1988-11-01 1993-03-17 Outokumpu Oy Metal detector
GB2232254A (en) * 1989-05-30 1990-12-05 Barkley & Dexter Lab Inc Search coil assembly for metal detectors and method for making such an assembly
WO1991004502A1 (en) * 1989-09-12 1991-04-04 Bayliss Electronic Industries Pty. Ltd. Induced field mineral value detector
WO1992001956A1 (en) * 1990-07-20 1992-02-06 John Lysaght (Australia) Limited Strip position sensor
GB2249634A (en) * 1990-11-07 1992-05-13 Gec Ferranti Defence Syst Security system for a vehicle
DE10157770C1 (en) * 2001-11-27 2002-11-07 Mustafa Uzman Metal detector with increased operating efficiency due to provision of a voltage tap between the driving oscillator circuit and the transmitter coil so that magnetic field strength can be optimized
WO2003046612A1 (en) * 2001-11-27 2003-06-05 Mustafa Uzman Metal detector
US8278918B2 (en) 2010-10-07 2012-10-02 Mettler-Toledo Safeline Limited Method for operating of a metal detection system and metal detection system
US8314713B2 (en) 2010-10-07 2012-11-20 Mettler-Toledo Safeline Limited Method for monitoring the operation of a metal detection system and metal detection system
US8587301B2 (en) 2010-10-07 2013-11-19 Mettler-Toledo Safeline Limited Method for operating a metal detection system and metal detection system
EP2562565A1 (en) * 2011-08-24 2013-02-27 Mettler-Toledo Safeline Limited Metal Detection Apparatus
US8841903B2 (en) 2011-08-24 2014-09-23 Mettler-Toledo Safeline Limited Metal detection apparatus
US9018935B2 (en) 2011-09-19 2015-04-28 Mettler-Toledo Safeline Limited Method for operating a metal detection apparatus and apparatus
EP3098597A2 (en) * 2014-01-20 2016-11-30 Lenz Instruments S.L. Method for determining quality parameters in meat products, and corresponding system
EP3425380A1 (en) * 2014-01-20 2019-01-09 Lenz Instruments S.L. Method for determining quality parameters in meat products and corresponding installation
WO2019215458A1 (en) * 2018-05-11 2019-11-14 The University Of Manchester Metal detector and method of manufacturing the same

Also Published As

Publication number Publication date
JPS4963462A (en) 1974-06-19
ES415206A1 (en) 1976-05-16
FR2189756B1 (en) 1977-02-11
FR2189756A1 (en) 1974-01-25
AU5620573A (en) 1974-11-28
IT990589B (en) 1975-07-10
CA1080821A (en) 1980-07-01
IL42338A (en) 1978-06-15
IL42338A0 (en) 1973-07-30
DE2326797A1 (en) 1973-12-06

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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