GB1456102A - Intrusion detection system - Google Patents

Intrusion detection system

Info

Publication number
GB1456102A
GB1456102A GB3157574A GB3157574A GB1456102A GB 1456102 A GB1456102 A GB 1456102A GB 3157574 A GB3157574 A GB 3157574A GB 3157574 A GB3157574 A GB 3157574A GB 1456102 A GB1456102 A GB 1456102A
Authority
GB
United Kingdom
Prior art keywords
wire
tube
july
fed
charge
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
GB3157574A
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 GB1456102A publication Critical patent/GB1456102A/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
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Abstract

1456102 Pressure transducers WESTINGHOUSE ELECTRIC CORP 17 July 1974 [24 July 1973] 31575/74 Heading G1N [ Also in Division G4 ] A transducer to be buried in the ground for sensing mechanical shocks, as produced by e.g. an intruder, comprises an insulated wire 12 (Fig. 1) loosely positioned in a metal tube 14 whereby disturbances at ground level cause the wire to move inside the tube and produce a capacitance charge between conductor 16 and tube 14 which is fed as a voltage signal to a recorder or alarm 30, using the electret characteristic of the wire 12 based on the charge fed into the wire during manufacture, or from a separate voltage source S. The output signal is separated by filter 22 into its high and low frequency components.
GB3157574A 1973-07-24 1974-07-17 Intrusion detection system Expired GB1456102A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00382264A US3846780A (en) 1973-07-24 1973-07-24 Intrusion detection system

Publications (1)

Publication Number Publication Date
GB1456102A true GB1456102A (en) 1976-11-17

Family

ID=23508197

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3157574A Expired GB1456102A (en) 1973-07-24 1974-07-17 Intrusion detection system

Country Status (10)

Country Link
US (2) US3846780A (en)
JP (1) JPS5248079B2 (en)
BE (1) BE817967A (en)
CA (1) CA1012225A (en)
DE (1) DE2435444A1 (en)
ES (1) ES428528A1 (en)
FR (1) FR2238980B1 (en)
GB (1) GB1456102A (en)
NL (1) NL7408923A (en)
TR (1) TR18071A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20301907U1 (en) 2003-02-07 2003-04-30 Wintjens, Rüdiger, 47533 Kleve Synthesiser controlled infra red laser security system with 4D barrier and point matrix display

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047166A (en) * 1976-01-26 1977-09-06 Gte Sylvania Incorporated Electrostatically charged cable transducer
FR2391519A1 (en) * 1977-05-16 1978-12-15 App Automatiques Ste Fse Discriminating presence of detector with alarm system - is in form of rubber foam mat incorporating separated conducting sheets
JPS578179Y2 (en) * 1977-09-27 1982-02-17
US4236109A (en) * 1977-12-12 1980-11-25 Lockheed Corporation Dielectric monitored composite assembly
US4197529A (en) * 1978-02-17 1980-04-08 The United States Of America As Represented By The Secretary Of The Navy Intrusion detection apparatus
US4237421A (en) * 1978-10-19 1980-12-02 General Electric Company Single-electrode capacitance touchpad sensor systems
IL66040A (en) * 1982-06-11 1987-12-20 Beta Eng & Dev Ltd Intrusion detection system
IT1229151B (en) * 1989-04-07 1991-07-22 Hesa Spa ALARM OR SIGNALING DEVICE WHOSE SENSOR ELEMENT IS CONSTITUTED BY A SHIELDED POLARIZED CURRENT COAXIAL CABLE
US4994793A (en) * 1989-12-08 1991-02-19 Kevin Curtis Weight shift detector
US5705984A (en) * 1996-05-10 1998-01-06 The United States Of America As Represented By The Secretary Of The Navy Passive intrusion detection system
US6025782A (en) 1996-09-04 2000-02-15 Newham; Paul Device for monitoring the presence of a person using proximity induced dielectric shift sensing
US6967584B2 (en) * 2003-07-28 2005-11-22 Senstar-Stellar Corporation Integrated sensor cable for ranging
FR2863395B1 (en) * 2003-12-04 2006-04-21 Internat Pool Safety And Light BARRIER HAVING A CROSS CONSTRAINT DETECTION DEVICE
US7479878B2 (en) * 2004-07-28 2009-01-20 Senstar-Stellar Corporation Triboelectric, ranging, or dual use security sensor cable and method of manufacturing same
FR2876481B1 (en) * 2004-10-13 2007-01-19 Atral Soc Par Actions Simplifi ALARM SYSTEM EQUIPPED WITH A SHORT-CIRCUIT DETECTOR
US7881882B2 (en) * 2006-09-25 2011-02-01 Ut-Battelle, Llc Apparatus and method for detecting tampering in flexible structures
ITBA20090007A1 (en) * 2009-02-03 2009-05-05 Rocco Carone CAPACITIVE SENSOR OF PRESENCE FOR ANTI-INTRUSION AND COMMAND
JP5568993B2 (en) * 2010-01-08 2014-08-13 オムロン株式会社 Static induction generator

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2649579A (en) * 1950-02-01 1953-08-18 Standard Oil Dev Co Detector for seismic exploration
US2837082A (en) * 1954-03-18 1958-06-03 Elliott Robert Vincent Accelerometer
US2787784A (en) * 1954-04-30 1957-04-02 Harold T Meryman Triboelectric detecting system
US2965877A (en) * 1957-06-10 1960-12-20 James H Stein Capacitive-type line hydrophone
US3109165A (en) * 1958-09-05 1963-10-29 Specialties Dev Corp Intruder detecting system
US3889230A (en) * 1966-09-02 1975-06-10 Woods Hole Oceanographic Inst Capacitive transducer and method of using the same
GB1209506A (en) 1968-03-18 1970-10-21 Marconi Co Ltd Improvements in or relating to vibration detectors
GB1278249A (en) 1968-12-10 1972-06-21 Marconi Co Ltd Improvements in or relating to vibration detectors
US3763482A (en) * 1971-02-01 1973-10-02 Gte Sylvania Inc Coaxial cable transducer
US3750127A (en) * 1971-10-28 1973-07-31 Gen Dynamics Corp Method and means for sensing strain with a piezoelectric strain sensing element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20301907U1 (en) 2003-02-07 2003-04-30 Wintjens, Rüdiger, 47533 Kleve Synthesiser controlled infra red laser security system with 4D barrier and point matrix display

Also Published As

Publication number Publication date
DE2435444A1 (en) 1975-02-13
FR2238980A1 (en) 1975-02-21
FR2238980B1 (en) 1978-12-08
TR18071A (en) 1976-09-21
USRE29896E (en) 1979-01-30
CA1012225A (en) 1977-06-14
JPS5248079B2 (en) 1977-12-07
BE817967A (en) 1975-01-23
US3846780A (en) 1974-11-05
ES428528A1 (en) 1976-08-16
NL7408923A (en) 1975-01-28
JPS5044794A (en) 1975-04-22

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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