CA979099A - Balanced field metal detector - Google Patents

Balanced field metal detector

Info

Publication number
CA979099A
CA979099A CA145,583A CA145583A CA979099A CA 979099 A CA979099 A CA 979099A CA 145583 A CA145583 A CA 145583A CA 979099 A CA979099 A CA 979099A
Authority
CA
Canada
Prior art keywords
metal detector
field metal
balanced field
balanced
detector
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
CA145,583A
Other versions
CA145583S (en
Inventor
Clarence L. Bennett (Jr.)
Harald Wilhelmsen
Joseph D. Delorenzo
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.)
Sperry Corp
Original Assignee
Sperry Rand 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 Sperry Rand Corp filed Critical Sperry Rand Corp
Application granted granted Critical
Publication of CA979099A publication Critical patent/CA979099A/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
    • G01V3/105—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 forming directly coupled primary and secondary coils or loops
    • G01V3/107—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 forming directly coupled primary and secondary coils or loops using compensating coil or loop arrangements
CA145,583A 1971-07-15 1972-06-23 Balanced field metal detector Expired CA979099A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00162884A US3763424A (en) 1971-07-15 1971-07-15 Metal detector for identifying and discriminating between objects of different size, shape, orientation and ferrous content and including an auto nulling circuit

Publications (1)

Publication Number Publication Date
CA979099A true CA979099A (en) 1975-12-02

Family

ID=22587533

Family Applications (1)

Application Number Title Priority Date Filing Date
CA145,583A Expired CA979099A (en) 1971-07-15 1972-06-23 Balanced field metal detector

Country Status (3)

Country Link
US (1) US3763424A (en)
JP (1) JPS4820552A (en)
CA (1) CA979099A (en)

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1398983A (en) * 1972-05-18 1975-06-25 British Gas Corp Excavating machines
US3919704A (en) * 1972-12-04 1975-11-11 Check Mate Systems Inc System and method for detecting unauthorized removal of goods from protected premises, and magnet detecting apparatus suitable for use therein
US3938125A (en) * 1974-02-20 1976-02-10 Minnesota Mining And Manufacturing Company Antipilferage system and marker therefor
US4006407A (en) * 1975-03-10 1977-02-01 Magnaflux Corporation Non-destructive testing systems having automatic balance and sample and hold operational modes
US4063230A (en) * 1975-06-12 1977-12-13 The Magnavox Company Balanced field theft detection system
US4263551A (en) * 1975-10-16 1981-04-21 Georgetown University Method and apparatus for identifying conductive objects by monitoring the true resistive component of impedance change in a coil system caused by the object
JPS5465200U (en) * 1977-10-14 1979-05-09
JPS5466399U (en) * 1977-10-18 1979-05-11
US4191922A (en) * 1978-03-14 1980-03-04 Republic Steel Corporation Electromagnetic flaw detection system and method incorporating improved automatic coil error signal compensation
US4250451A (en) * 1978-12-28 1981-02-10 Cordless Power Corporation Magnetic induction imaging system
US4709213A (en) * 1982-07-23 1987-11-24 Garrett Electronics, Inc. Metal detector having digital signal processing
US4531118A (en) * 1983-08-29 1985-07-23 Dickey-John Corporation Metal detector
FR2570501B1 (en) * 1984-09-20 1987-12-18 Siderurgie Fse Inst Rech METHOD FOR THE DETECTION OF SURFACE FAULTS BY EDGE CURRENTS AND DEVICE IMPLEMENTING THIS METHOD
EP0222028B1 (en) * 1985-11-02 1988-12-28 Vallon GmbH Metal detector for detecting metal objects
US4821023A (en) * 1988-01-07 1989-04-11 Del Norte Technology, Inc. Walk-through metal detector
US5034690A (en) * 1988-04-01 1991-07-23 Taliaferro Sam W Method and apparatus for quantitatively determining whether at least one of two or more ferromagnetic components is missing from an assembly
US5121103A (en) * 1988-07-29 1992-06-09 Knogo Corporation Load isolated article surveillance system and antenna assembly
US5099224A (en) * 1991-01-08 1992-03-24 Santiago Jesus C P Method for identifying magnetic characteristics of magnetic elements
US5493517A (en) * 1991-06-03 1996-02-20 Hughes Missile Systems Company Cargo container mapping system
US5397986A (en) * 1991-11-01 1995-03-14 Federal Labs Systems Lp Metal detector system having multiple, adjustable transmitter and receiver antennas
US5521583A (en) * 1994-01-19 1996-05-28 Ranger Security Detectors, Inc. Metal detection system
US5721489A (en) * 1995-10-06 1998-02-24 Garrett Electronics, Inc. Metal detector method for identifying target size
US5726628A (en) * 1996-05-06 1998-03-10 Gd Electronics, Inc. Metal detector system
DE19700753C2 (en) * 1997-01-11 2000-09-14 Schott Glas Hob with a non-metallic hotplate
US6583625B1 (en) * 2000-10-16 2003-06-24 Frl, Inc. Metal detector and method in which mineralization effects are eliminated
US6949925B2 (en) * 2002-01-30 2005-09-27 Syron Engineering & Manufacturing, Llc Proximity sensor device that determines at least one physical characteristic of an item
US20130307533A1 (en) 2012-05-18 2013-11-21 Metrasens Limited Security system and method of detecting contraband items
GB201219097D0 (en) 2012-10-24 2012-12-05 Metrasens Ltd Apparatus for detecting ferromagnetic objects at a protected doorway assembly
CN110045423A (en) 2014-12-18 2019-07-23 梅特拉森斯有限公司 Security system and the method for detecting contraband
DE102015213981A1 (en) * 2015-07-24 2017-01-26 Conti Temic Microelectronic Gmbh Detection of a foreign body in an electromagnetic field, in particular with the aid of an NFC chip
GB201602652D0 (en) 2016-02-15 2016-03-30 Metrasens Ltd Improvements to magnetic detectors

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA480447A (en) * 1952-01-22 Cinema-Television Limited Apparatus for detecting and/or locating by electrical means masses of electrically conducting or magnetic material
US2179240A (en) * 1937-01-02 1939-11-07 Illinois Testing Laboratories Metal detection device
US3020470A (en) * 1943-06-04 1962-02-06 Elbert N Shawhan Submerged body detection system
US3292080A (en) * 1964-11-23 1966-12-13 Emmanuel M Trikilis System and method for preventing pilferage by detection of magnetic fields
FI40646B (en) * 1967-04-10 1968-12-31 Outokumpu Oy
US3573784A (en) * 1968-10-02 1971-04-06 Henry L Bachofer Metal detecting apparatus for conveyor belt
US3549985A (en) * 1969-02-27 1970-12-22 Electronic Sensing Prod Inc Metal detecting device having a diskshaped head for housing a coil system

Also Published As

Publication number Publication date
JPS4820552A (en) 1973-03-14
US3763424A (en) 1973-10-02

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