GB997278A - Intruder detection system - Google Patents

Intruder detection system

Info

Publication number
GB997278A
GB997278A GB2189364A GB2189364A GB997278A GB 997278 A GB997278 A GB 997278A GB 2189364 A GB2189364 A GB 2189364A GB 2189364 A GB2189364 A GB 2189364A GB 997278 A GB997278 A GB 997278A
Authority
GB
United Kingdom
Prior art keywords
acoustic
shaped
reflect
intruder
light
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
GB2189364A
Inventor
Arthur Edward Brewster
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.)
STC PLC
Original Assignee
Standard Telephone and Cables 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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2189364A priority Critical patent/GB997278A/en
Publication of GB997278A publication Critical patent/GB997278A/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
    • G08B13/18—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

Abstract

997,278. Measuring distances by sound and other waves. STANDARD TELEPHONES & CABLES Ltd. May 27, 1964, No. 21893/64. Addition to 984,398. Heading H4D. [Also in Division G4] An intruder detection system comprises two coaxial or closely spaced beams, one of electromagnetic radiation, and one of acoustic radiation propagated along the boundary to be protected. As described a common focusing system is used employing a mirror 14 with its front surface 15 shaped to reflect radiations received from an ultrasonic transducer 16, and its rear surface 18 silvered and shaped to focus light from the light source 19. The secondary mirror 17 has its front surface 20 shaped to reflect the acoustic wave from transducer 16, and at the same time be transparent to light from source 19. The radiations may be modulated. A comparator may be provided to measure the delay between detection of the optical and acoustic cut-offs due to an intruder interrupting the compositer beam, so that his position along the beam may be determined. The acoustic and optical sources may alternatively be situated at the same point, Fig. 2 (not shown), and may comprise for example a spark gap.
GB2189364A 1964-05-27 1964-05-27 Intruder detection system Expired GB997278A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2189364A GB997278A (en) 1964-05-27 1964-05-27 Intruder detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2189364A GB997278A (en) 1964-05-27 1964-05-27 Intruder detection system

Publications (1)

Publication Number Publication Date
GB997278A true GB997278A (en) 1965-07-07

Family

ID=10170564

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2189364A Expired GB997278A (en) 1964-05-27 1964-05-27 Intruder detection system

Country Status (1)

Country Link
GB (1) GB997278A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485209A1 (en) * 1980-06-23 1981-12-24 Cometa Sa OPTICAL AMPLIFIER DEVICE
WO2009036926A1 (en) * 2007-09-17 2009-03-26 Eads Deutschland Gmbh Optical device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485209A1 (en) * 1980-06-23 1981-12-24 Cometa Sa OPTICAL AMPLIFIER DEVICE
EP0042805A1 (en) * 1980-06-23 1981-12-30 COMETA Société Anonyme dite: Bidimensional photo-electric barrier
WO2009036926A1 (en) * 2007-09-17 2009-03-26 Eads Deutschland Gmbh Optical device

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