FR2801400B1 - DETECTION SYSTEM - Google Patents

DETECTION SYSTEM

Info

Publication number
FR2801400B1
FR2801400B1 FR0014808A FR0014808A FR2801400B1 FR 2801400 B1 FR2801400 B1 FR 2801400B1 FR 0014808 A FR0014808 A FR 0014808A FR 0014808 A FR0014808 A FR 0014808A FR 2801400 B1 FR2801400 B1 FR 2801400B1
Authority
FR
France
Prior art keywords
detection system
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 - Fee Related
Application number
FR0014808A
Other languages
French (fr)
Other versions
FR2801400A1 (en
Inventor
Paul David Townsend
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.)
British Telecommunications PLC
Original Assignee
British Telecommunications PLC
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
Priority claimed from GBGB9906208.5A external-priority patent/GB9906208D0/en
Priority claimed from GBGB9907321.5A external-priority patent/GB9907321D0/en
Application filed by British Telecommunications PLC filed Critical British Telecommunications PLC
Publication of FR2801400A1 publication Critical patent/FR2801400A1/en
Application granted granted Critical
Publication of FR2801400B1 publication Critical patent/FR2801400B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/187—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interference of a radiation field
FR0014808A 1999-03-17 2000-11-13 DETECTION SYSTEM Expired - Fee Related FR2801400B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9906208.5A GB9906208D0 (en) 1999-03-17 1999-03-17 Detection system
GBGB9907321.5A GB9907321D0 (en) 1999-03-29 1999-03-29 Detection system

Publications (2)

Publication Number Publication Date
FR2801400A1 FR2801400A1 (en) 2001-05-25
FR2801400B1 true FR2801400B1 (en) 2003-02-07

Family

ID=26315294

Family Applications (2)

Application Number Title Priority Date Filing Date
FR0014819A Pending FR2801401A1 (en) 1999-03-17 2000-11-13 DETECTION SYSTEM
FR0014808A Expired - Fee Related FR2801400B1 (en) 1999-03-17 2000-11-13 DETECTION SYSTEM

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR0014819A Pending FR2801401A1 (en) 1999-03-17 2000-11-13 DETECTION SYSTEM

Country Status (2)

Country Link
FR (2) FR2801401A1 (en)
GB (2) GB2361308B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2896025A1 (en) * 2012-09-13 2015-07-22 MBDA UK Limited Room occupancy sensing apparatus and method
GB2505896B (en) * 2012-09-13 2015-09-02 Mbda Uk Ltd Room occupancy sensing apparatus and method
EP2709080A1 (en) * 2012-09-13 2014-03-19 MBDA UK Limited Room occupancy sensing apparatus and method

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2492136A1 (en) * 1980-10-13 1982-04-16 Commissariat Energie Atomique INVIOLABLE BARRIER FOR PROTECTION AGAINST INTRUSIONS
WO1983001855A1 (en) * 1981-11-19 1983-05-26 Minnesota Mining & Mfg Optically based intrusion detector
DE3447131A1 (en) * 1984-12-22 1986-06-26 Telenot Electronic GmbH, 7080 Aalen ROOM PROTECTION SYSTEM
DE3530646A1 (en) * 1985-08-28 1987-03-12 Telenot Electronic Gmbh AREA SECURING
GB2217441A (en) * 1987-12-15 1989-10-25 Plessey Co Plc Alarm system for enclosures
EP0388352A1 (en) * 1989-03-15 1990-09-19 Elesta Ag Elektronik One way light barrier arrangement
US5142152A (en) * 1991-01-02 1992-08-25 The Stanley Works Sliding door sensor
US5233185A (en) * 1992-02-28 1993-08-03 Gmi Holdings, Inc. Light beam detector for door openers using fiber optics
US5326028A (en) * 1992-08-24 1994-07-05 Sanyo Electric Co., Ltd. System for detecting indoor conditions and air conditioner incorporating same
AU674198B2 (en) * 1992-12-24 1996-12-12 British Telecommunications Public Limited Company System and method for key distribution using quantum cryptography
WO1996006491A1 (en) * 1994-08-18 1996-02-29 British Telecommunications Public Limited Company Quantum cryptography
US5886307A (en) * 1997-06-23 1999-03-23 Otis Elevator Company Safety detection system for sliding doors

Also Published As

Publication number Publication date
GB2361058A (en) 2001-10-10
GB2361308B (en) 2002-04-10
FR2801400A1 (en) 2001-05-25
GB2361308A (en) 2001-10-17
GB2361058B (en) 2002-03-20
GB0029101D0 (en) 2001-03-21
FR2801401A1 (en) 2001-05-25
GB0029099D0 (en) 2001-03-21

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Legal Events

Date Code Title Description
ST Notification of lapse