ES413541A1 - Surveillance system and method utilizing both electrostatic and electromagnetic fields - Google Patents

Surveillance system and method utilizing both electrostatic and electromagnetic fields

Info

Publication number
ES413541A1
ES413541A1 ES413541A ES413541A ES413541A1 ES 413541 A1 ES413541 A1 ES 413541A1 ES 413541 A ES413541 A ES 413541A ES 413541 A ES413541 A ES 413541A ES 413541 A1 ES413541 A1 ES 413541A1
Authority
ES
Spain
Prior art keywords
low frequency
microwave
space
electrostatic
electromagnetic wave
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
ES413541A
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.)
Sensormatic Electronics Corp
Original Assignee
Sensormatic Electronics 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 Sensormatic Electronics Corp filed Critical Sensormatic Electronics Corp
Publication of ES413541A1 publication Critical patent/ES413541A1/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
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2422—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using acoustic or microwave tags
    • 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
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2471—Antenna signal processing by receiver or emitter

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

A microwave signal generator projects an electromagnetic wave into a space under surveillance to establish a first field. A pulse or frequency modulated low frequency generator is used to apply a voltage to a discontinuous conductor for establishing a second field, electrostatic in nature, throughout the space. Presence in the space of a miniature passive electromagnetic wave receptor-reradiator in the form of a semiconductive diode connected to a dipole antenna causes the reradiation of the low frequency component modulated on the microwave component as a carrier. The front end of a receiver system is tuned to the microwave frequency and feeds a suitable detector circuit responsive to the low frequency signal. A coincidence circuit energizes an alarm circuit whenever the detected signal coincides with the original modulation envelope being applied to the low frequency generator.
ES413541A 1972-08-09 1973-04-10 Surveillance system and method utilizing both electrostatic and electromagnetic fields Expired ES413541A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US279097A US3895368A (en) 1972-08-09 1972-08-09 Surveillance system and method utilizing both electrostatic and electromagnetic fields

Publications (1)

Publication Number Publication Date
ES413541A1 true ES413541A1 (en) 1976-02-01

Family

ID=23067622

Family Applications (1)

Application Number Title Priority Date Filing Date
ES413541A Expired ES413541A1 (en) 1972-08-09 1973-04-10 Surveillance system and method utilizing both electrostatic and electromagnetic fields

Country Status (12)

Country Link
US (1) US3895368A (en)
JP (1) JPS5724598B2 (en)
BE (1) BE801202A (en)
BR (1) BR7306051D0 (en)
CA (1) CA1003522A (en)
DE (1) DE2316411C3 (en)
ES (1) ES413541A1 (en)
FR (1) FR2195812B1 (en)
GB (1) GB1406925A (en)
IT (1) IT982964B (en)
NL (1) NL7305216A (en)
ZA (1) ZA734480B (en)

Families Citing this family (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069472A (en) * 1975-12-25 1978-01-17 Tokyo Shibaura Electric Co., Ltd. Foreground subject-identifying apparatus
US4212002A (en) * 1976-05-24 1980-07-08 Williamson Robert D Method and apparatus for selective electronic surveillance
US4206453A (en) * 1976-05-24 1980-06-03 Williamson Robert D Method and apparatus for electronic surveillance
US4087802A (en) * 1976-05-24 1978-05-02 Williamson Robert D Method and apparatus for electronic surveillance of precisely defined control zone
NL7708012A (en) * 1977-07-19 1979-01-23 Nedap Nv DETECTION SYSTEM.
US4139844A (en) * 1977-10-07 1979-02-13 Sensormatic Electronics Corporation Surveillance method and system with electromagnetic carrier and plural range limiting signals
FR2416514A1 (en) * 1978-02-03 1979-08-31 Williamson Robert Electronic surveillance of precisely defined control zone - using HF generator projecting wave to establish first field and FM generator for second field
DE2833509A1 (en) * 1978-07-31 1980-02-14 Siemens Ag Identifying and locating device for objects and persons - has mark on object interrogated and received signal is processed and evaluated
US4254868A (en) * 1979-02-05 1981-03-10 Sensormatic Electronics Corporation Enclosure for a security tag and extraction implement
EP0020062B1 (en) * 1979-05-18 1984-03-07 Parmeko Limited Method and surveillance system for detecting the presence of an e.m. wave receptor reradiator
US4281321A (en) * 1980-06-09 1981-07-28 Sensormatic Electronics Corporation Surveillance system employing a floor mat radiator
US4471344A (en) * 1980-10-09 1984-09-11 Ici Americas Inc. Dual frequency anti-theft system
CA1190970A (en) * 1980-10-09 1985-07-23 Harold B. Williams Dual frequency anti-theft system
JPS5768070U (en) * 1980-10-09 1982-04-23
US4430645A (en) * 1981-04-07 1984-02-07 Sensormatic Electronics Corporation Surveillance system employing a dual function floor mat radiator
US4413254A (en) * 1981-09-04 1983-11-01 Sensormatic Electronics Corporation Combined radio and magnetic energy responsive surveillance marker and system
USRE32627E (en) * 1981-09-10 1988-03-22 Sensormatic Electronics Corporation Electrical surveillance apparatus with moveable antenna elements
US4394645A (en) * 1981-09-10 1983-07-19 Sensormatic Electronics Corporation Electrical surveillance apparatus with moveable antenna elements
NL8200138A (en) * 1982-01-14 1983-08-01 Nedap Nv DETECTION SYSTEM.
US4472641A (en) * 1983-01-28 1984-09-18 Westinghouse Electric Corp. Power supply apparatus
US4642640A (en) * 1983-04-25 1987-02-10 Sensormatic Electronics Corporation Signal receptor-reradiator and surveillance tag using the same
DE3472019D1 (en) * 1983-08-01 1988-07-14 Ici America Inc Electronic article surveillance system
CA1236542A (en) * 1983-08-02 1988-05-10 Harold B. Williams Electronic article surveillance system having microstrip antennas
US4679035A (en) * 1985-07-30 1987-07-07 Sensormatic Electronics Corporation Tri-signal electromagnetic article surveillance system
US4736207A (en) * 1986-01-31 1988-04-05 Sensormatic Electronics Corporation Tag device and method for electronic article surveillance
CA1335676C (en) * 1988-01-14 1995-05-23 Akira Iga Portable data transmitter device and a system using the same
FR2645309B1 (en) * 1989-04-04 1991-06-07 Usil Flandres Artois DEVICE FOR DETECTING THE PASSAGE OF AT LEAST ONE MOBILE AT AT LEAST A DETERMINED POINT OF ITS MOVEMENT
US5099227A (en) * 1989-07-18 1992-03-24 Indala Corporation Proximity detecting apparatus
US5109217A (en) * 1990-08-09 1992-04-28 Sensormatic Electronics Corporation Method and apparatus for enhancing detection of electronic article surveillance tags in close proximity to electrically conductive objects
US5206626A (en) * 1991-12-24 1993-04-27 Knogo Corporation Stabilized article surveillance responder
US5241923A (en) * 1992-07-23 1993-09-07 Pole/Zero Corporation Transponder control of animal whereabouts
US5349332A (en) * 1992-10-13 1994-09-20 Sensormatic Electronics Corportion EAS system with requency hopping
GB2306080B (en) * 1995-10-10 2000-02-16 Roke Manor Research Improvements in or relating to detection systems
RU2099789C1 (en) * 1996-07-30 1997-12-20 Кулагин Николай Павлович Method detecting intrusion of protected space and gear for its realization
US6064308A (en) * 1996-10-25 2000-05-16 Pole/Zero Corporation RF signaling system and system for controlling the whereabouts of animals using same
US6446049B1 (en) 1996-10-25 2002-09-03 Pole/Zero Corporation Method and apparatus for transmitting a digital information signal and vending system incorporating same
US5990791A (en) * 1997-10-22 1999-11-23 William B. Spargur Anti-theft detection system
US6166643A (en) * 1997-10-23 2000-12-26 Janning; Joseph J. Method and apparatus for controlling the whereabouts of an animal
DE19754936A1 (en) 1997-12-10 1999-07-01 Wegmann & Co Gmbh Sealing and guiding device for highly dynamically accelerated, distance-effective protective elements
JPH11283178A (en) * 1998-03-27 1999-10-15 Matsushita Electric Ind Co Ltd Electric resonance discriminator, electric resonance discriminator detecting device, and traffic system
ATE271244T1 (en) 1999-10-08 2004-07-15 Activerf Ltd IMPROVEMENTS RELATED TO SAFETY DEVICES
GB9923682D0 (en) * 1999-10-08 1999-12-08 Active Rf Limited Improvements relating to security-pushout prevention
US7395548B2 (en) * 2001-07-26 2008-07-01 Comsonics, Inc. System and method for signal validation and leakage detection
US6752837B2 (en) 2002-06-28 2004-06-22 Hewlett-Packard Development Company, L.P. Security tags with a reversible optical indicator
GB2423402B (en) 2002-07-19 2007-01-03 Gatekeeper Systems Improvements relating to security and electronic article surveillance
US7034687B2 (en) * 2004-04-29 2006-04-25 Comm-Engines Error-avoiding anti-theft surveillance system
JP2006287817A (en) * 2005-04-04 2006-10-19 Tokyo Electron Ltd Microwave generating device, microwave supplying device, plasma treatment device and microwave generating method
US20070296609A1 (en) * 2006-06-21 2007-12-27 Dave Thomas Method and apparatus for object recognition and warning system of a primary vehicle for nearby vehicles
US8350720B2 (en) * 2006-06-21 2013-01-08 Dave Thomas Method and apparatus for object recognition and warning system of a primary vehicle for nearby vehicles
US20090072995A1 (en) * 2006-06-21 2009-03-19 Dave Thomas Method and apparatus for transmitting information between a primary vehicle and a secondary vehicle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3631442A (en) * 1968-03-22 1971-12-28 Robert E Fearon Anti-shoplifting system
US3707711A (en) * 1970-04-02 1972-12-26 Peter Harold Cole Electronic surveillance system
US3711848A (en) * 1971-02-10 1973-01-16 I D Eng Inc Method of and apparatus for the detection of stolen articles
US3740742A (en) * 1971-05-11 1973-06-19 T Thompson Method and apparatus for actuating an electric circuit
US3806905A (en) * 1971-09-08 1974-04-23 Sperry Rand Corp Transducer and condition monitor

Also Published As

Publication number Publication date
FR2195812B1 (en) 1978-03-10
US3895368A (en) 1975-07-15
ZA734480B (en) 1974-06-26
JPS5724598B2 (en) 1982-05-25
BE801202A (en) 1973-10-15
FR2195812A1 (en) 1974-03-08
GB1406925A (en) 1975-09-17
DE2316411B2 (en) 1979-08-09
BR7306051D0 (en) 1974-07-11
IT982964B (en) 1974-10-21
JPS4945593A (en) 1974-05-01
NL7305216A (en) 1974-02-12
CA1003522A (en) 1977-01-11
DE2316411C3 (en) 1980-04-17
DE2316411A1 (en) 1974-02-28

Similar Documents

Publication Publication Date Title
ES413541A1 (en) Surveillance system and method utilizing both electrostatic and electromagnetic fields
ATE163789T1 (en) PERIODIC PULSE DISCRIMINATION SYSTEM
US3798642A (en) Recognition system
CA2035939C (en) Hyperfrequency system for remote data transmission
NO801465L (en) PROCEDURE AND DEVICE FOR THE DETECTION OF AN ELECTROMAGNETIC TRANSPONDER IN A MONITORING ZONE
ES472647A1 (en) Surveillance method and system with electromagnetic carrier and plural range limiting signals
GB1352818A (en) Data sensing system
DE3786124D1 (en) RECEIVING DEVICE FOR MICROWAVE SIGNALS.
SE7703443L (en) DEVICE FOR BURGLARY PROTECTION
SE9600528L (en) Sensor for contactless detection of objects
US4190838A (en) Radiation detector
CA2022746A1 (en) Radio system for data transmission with passive terminal station
US4010459A (en) Systems for the detection of moving objects within a survey area by microwave diffraction
GB1454626A (en) Transmitter output monitor for a dvor beacon system
GB542693A (en) Improvements in radio transmission systems
GB919172A (en)
GB1354947A (en) Identification systems and identification transmitters therefor
GB978727A (en) Frequency modulated transmitter monitor
US3448383A (en) Single frequency communication repeater
JPS5779476A (en) Identification device
US2520184A (en) Electrical wave signaling system
FR2416514A1 (en) Electronic surveillance of precisely defined control zone - using HF generator projecting wave to establish first field and FM generator for second field
FR2299652A1 (en) Inductive proximity detector used in security applications - has high frequency transmitter, receiver and data logic system
GB1305305A (en)
RAY Dispersible transmitting antenna VLF/LF investigation(Dispersible transmitting antenna VLF/LF study with maximum bandwidth)[Final Technical Report, 9 Feb.- 9 Dec. 1971]