ES419479A1 - Perimeter intrusion detection system - Google Patents

Perimeter intrusion detection system

Info

Publication number
ES419479A1
ES419479A1 ES419479A ES419479A ES419479A1 ES 419479 A1 ES419479 A1 ES 419479A1 ES 419479 A ES419479 A ES 419479A ES 419479 A ES419479 A ES 419479A ES 419479 A1 ES419479 A1 ES 419479A1
Authority
ES
Spain
Prior art keywords
coil means
earth
magnetic field
core member
intrusion detection
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
ES419479A
Other languages
Spanish (es)
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.)
CBS Corp
Original Assignee
Westinghouse Electric 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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of ES419479A1 publication Critical patent/ES419479A1/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field
    • G08B13/2497—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field using transmission lines, e.g. cable

Abstract

A perimeter intrusion detection apparatus to provide an indication of the presence of a magnetically permeable object characterized by an elongated magnetic core member and coil means wound around it, the core member and coil means being positioned with relative to the earth's surface to respond to changes in the earth's magnetic field, an alternating current drive source operatively connected to said coil means to establish a current flow in said coil means to saturate said core member, said coil means responding to changes in the earth's magnetic field caused by the presence of a magnetically permeable object developing alternating current output signals and first circuit means operatively connected to said coil means to respond to the content of the cited exit signs from running Alternating entity indicative of the intensity of the direct current magnetic field. (Machine-translation by Google Translate, not legally binding)
ES419479A 1972-10-10 1973-10-09 Perimeter intrusion detection system Expired ES419479A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00296376A US3812484A (en) 1972-10-10 1972-10-10 Perimeter intrusion detection system

Publications (1)

Publication Number Publication Date
ES419479A1 true ES419479A1 (en) 1976-04-01

Family

ID=23141746

Family Applications (1)

Application Number Title Priority Date Filing Date
ES419479A Expired ES419479A1 (en) 1972-10-10 1973-10-09 Perimeter intrusion detection system

Country Status (12)

Country Link
US (1) US3812484A (en)
JP (1) JPS4973000A (en)
BE (1) BE805810A (en)
BR (1) BR7307791D0 (en)
DE (1) DE2350067A1 (en)
ES (1) ES419479A1 (en)
FR (1) FR2202330B1 (en)
GB (1) GB1435370A (en)
IT (1) IT997407B (en)
NL (1) NL7313839A (en)
SE (1) SE385163B (en)
TR (1) TR18180A (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889181A (en) * 1974-03-08 1975-06-10 Us Army Magnetic system for discriminating between vehicles and personnel based upon their characteristic frequency signatures
US4326198A (en) * 1976-08-18 1982-04-20 Knogo Corporation Method and apparatus for the promotion of selected harmonic response signals in an article detection system
US4286261A (en) * 1978-09-01 1981-08-25 The United States Of America As Represented By The Secretary Of The Army Apparatus for discriminating between strain and magnetic stimuli in magnetic cored solenoid type transducer line sensors
JPS58502034A (en) * 1981-12-03 1983-12-01 グレイ，ジヨ−ジ　シ−モア Line fault detector
US5079538A (en) * 1987-04-24 1992-01-07 Specific Cruise Systems, Inc. Automobile intruder alarm system
US4866417A (en) * 1987-04-24 1989-09-12 Specific Cruise Systems, Inc. Automobile intruder alarm system
US5402106A (en) * 1993-05-06 1995-03-28 Anthony M. DiPaolo Shopping cart theft prevention system
US6204772B1 (en) 1999-12-16 2001-03-20 Caterpillar Inc. Method and apparatus for monitoring the position of a machine
US20060068754A1 (en) * 2004-09-30 2006-03-30 Helena Goldfarb System and method for securing a large infrastructure
US7298260B1 (en) 2005-03-09 2007-11-20 Cossette Harold J Tesla coil security system
RU2303290C2 (en) * 2005-09-12 2007-07-20 Фонд "Инновационный Центр Ибраэ Ран" Method for finding moving electro-conductive objects
US20120207261A1 (en) * 2011-02-08 2012-08-16 Noel James L Nuclear Power Facility
GB201118970D0 (en) * 2011-11-02 2011-12-14 Univ Sussex Target position,movement and tracking system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3355707A (en) * 1964-05-11 1967-11-28 Bunker Ramo Apparatus for vehicle detection
US3249915A (en) * 1965-04-20 1966-05-03 Trw Inc Method and apparatus for vehicle detection
FR1478357A (en) * 1965-09-14 1967-04-28 Wiener Schwachstromwerke Gmbh Installation for the measurement and detection of magnetic fields or changes in magnetic fields
US3458802A (en) * 1966-05-02 1969-07-29 Bunker Ramo Magnetic vehicle detection system including feedback means for eliminating spurious presence indications
US3754223A (en) * 1970-01-21 1973-08-21 Yeda Res & Dev Intruder detection system

Also Published As

Publication number Publication date
SE385163B (en) 1976-06-08
IT997407B (en) 1975-12-30
JPS4973000A (en) 1974-07-15
BR7307791D0 (en) 1974-08-29
FR2202330A1 (en) 1974-05-03
FR2202330B1 (en) 1978-06-30
TR18180A (en) 1978-02-26
NL7313839A (en) 1974-04-16
DE2350067A1 (en) 1974-04-18
BE805810A (en) 1974-04-09
GB1435370A (en) 1976-05-12
US3812484A (en) 1974-05-21

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