NO960783L - Method and apparatus for preventing false response in an optical detector - Google Patents

Method and apparatus for preventing false response in an optical detector

Info

Publication number
NO960783L
NO960783L NO960783A NO960783A NO960783L NO 960783 L NO960783 L NO 960783L NO 960783 A NO960783 A NO 960783A NO 960783 A NO960783 A NO 960783A NO 960783 L NO960783 L NO 960783L
Authority
NO
Norway
Prior art keywords
optical radiation
source
detector
signal
preventing false
Prior art date
Application number
NO960783A
Other languages
Norwegian (no)
Other versions
NO960783D0 (en
Inventor
William Joseph Senior Hirst
Original Assignee
Shell Int Research
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 Shell Int Research filed Critical Shell Int Research
Publication of NO960783D0 publication Critical patent/NO960783D0/en
Publication of NO960783L publication Critical patent/NO960783L/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

Fremgangsmåte og apparat for å hindre falsk respons i en optisk detektor ( l ) som er følsom overfor fluktuasjoner eller endringer i den optiske stråling fra en kilde (3). Følgende trinn utføres: a) mottaking av den optiske stråling fra kilden, b) valg av et forhåndsbestemt bølgelengdeområde, c) registrering av endringer i den mot- tatte optiske stråling og utledning av et tidsrelatert signal (kurverepresenta- sjon) på detektorens utgang, d) analyse av det detekterte signal med hensyn på kaotisk (dvs aperiodisk) oppførsel ved å etablere den tilordnede fraktaldimensjon av signalet og bruk av denne fraktal- egenskap hos det tidsrelaterte signal : fra den optiske ståling fra kilden (3) for å skille mellom kilder med fluktuer- ende optisk stråling med periodisk eller avbrutt forløp og e) bare gi en respons på utgangen av detektoren i tilfelle kaotisk stråleforløp registreres fra kilden.Method and apparatus for preventing false response in an optical detector (1) which is sensitive to fluctuations or changes in the optical radiation from a source (3). The following steps are performed: a) receiving the optical radiation from the source, b) selecting a predetermined wavelength range, c) recording changes in the received optical radiation and emitting a time-related signal (curve representation) at the detector output, d analysis of the detected signal with respect to chaotic (i.e. aperiodic) behavior by establishing the assigned fractal dimension of the signal and using this fractal property of the time-related signal: from the optical radiation from the source (3) to distinguish between sources of fluctuating optical radiation with periodic or interrupted course and e) only give a response to the output of the detector in case chaotic radiation is detected from the source.

NO960783A 1993-08-31 1996-02-27 Method and apparatus for preventing false response in an optical detector NO960783L (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP93306865 1993-08-31
PCT/EP1994/002888 WO1995006927A1 (en) 1993-08-31 1994-08-30 Method and apparatus for preventing false responses in optical detection devices

Publications (2)

Publication Number Publication Date
NO960783D0 NO960783D0 (en) 1996-02-27
NO960783L true NO960783L (en) 1996-03-12

Family

ID=8214523

Family Applications (1)

Application Number Title Priority Date Filing Date
NO960783A NO960783L (en) 1993-08-31 1996-02-27 Method and apparatus for preventing false response in an optical detector

Country Status (8)

Country Link
EP (1) EP0715744B1 (en)
AU (1) AU7537594A (en)
CA (1) CA2170519A1 (en)
DE (1) DE69407190T2 (en)
DK (1) DK0715744T3 (en)
NO (1) NO960783L (en)
SG (1) SG97742A1 (en)
WO (1) WO1995006927A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1236183A2 (en) * 1999-12-10 2002-09-04 Durand Technology Limited Improvements in or relating to applications of fractal and/or chaotic techniques
DE102009048739B3 (en) * 2009-07-14 2012-03-29 Deutsches Zentrum für Luft- und Raumfahrt e.V. Automatic forest fire detection method involves triggering alarm, if fractal dimensions of grey values of current image and cluster surface of binarized image, and respective axis intercept lie within preset value

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665390A (en) * 1985-08-22 1987-05-12 Hughes Aircraft Company Fire sensor statistical discriminator
US4866420A (en) * 1988-04-26 1989-09-12 Systron Donner Corp. Method of detecting a fire of open uncontrolled flames
US5051590A (en) * 1989-12-06 1991-09-24 Santa Barbara Research Center Fiber optic flame detection and temperature measurement system having one or more in-line temperature dependent optical filters
US5201321A (en) * 1991-02-11 1993-04-13 Fulton Keith W Method and apparatus for diagnosing vulnerability to lethal cardiac arrhythmias
US5185687A (en) * 1991-03-28 1993-02-09 Eaton Corporation Chaos sensing arc detection
JPH0535768A (en) * 1991-07-26 1993-02-12 Hitachi Ltd Information processor utilizing fractal dimension

Also Published As

Publication number Publication date
AU7537594A (en) 1995-03-22
EP0715744A1 (en) 1996-06-12
EP0715744B1 (en) 1997-12-03
WO1995006927A1 (en) 1995-03-09
DK0715744T3 (en) 1998-08-10
SG97742A1 (en) 2003-08-20
NO960783D0 (en) 1996-02-27
DE69407190T2 (en) 1998-05-20
DE69407190D1 (en) 1998-01-15
CA2170519A1 (en) 1995-03-09

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