EP0251371A3 - Active infrared light object detector - Google Patents

Active infrared light object detector Download PDF

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Publication number
EP0251371A3
EP0251371A3 EP87201088A EP87201088A EP0251371A3 EP 0251371 A3 EP0251371 A3 EP 0251371A3 EP 87201088 A EP87201088 A EP 87201088A EP 87201088 A EP87201088 A EP 87201088A EP 0251371 A3 EP0251371 A3 EP 0251371A3
Authority
EP
European Patent Office
Prior art keywords
infrared light
room
light
receiver
demodulator
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.)
Withdrawn
Application number
EP87201088A
Other languages
German (de)
French (fr)
Other versions
EP0251371A2 (en
Inventor
Tjeerd Venema
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0251371A2 publication Critical patent/EP0251371A2/en
Publication of EP0251371A3 publication Critical patent/EP0251371A3/en
Withdrawn legal-status Critical Current

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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
    • G08B13/187—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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

Figur 1 zeigt den beschriebenen Infrarotlicht Objektmel­ der. 1 stellt einen willkürlichen Generator dar. Über Leitung 2 wird mit diesem Signal eine Infrarotlichtquelle 3 gesteuert. Dadurch strahlt 3 Infrarotlicht aus, dass auf die eine oder an­ dere Weise mit dem genannten Signal von 1 moduliert ist. Wenn Infrarotlicht ausgestrahlt wird, reflektiert dies gegen alle Objekte mit einer ziemlich festen Form, wie Objekt 5. Das Infrarotlicht von 3 fällt als Lichtstrahl 4 auf Objekt 5, wird re­ flektiert, und fällt als Lichtstrahl 6 auf den Eingang des Infra­ rotlichtempfängers 7. Bei der Erfindung wird nicht ein einzel­ ner Lichtstrahl, sondern ein räumliches Lichtbündel mit einem willkürlichen Winkel über 3 ausgestrahlt. Somit wird der betroffene Raum soweit wie möglich mit dem von 3 ausgestrahlten Infrarotlicht ausgefüllt. Empfänger 7, in Figur 1, empfängt die totale Infrarotlichtreflexion der Objekte, die im betreffenden Raum das Infrarotlicht nach Empfänger 7 zurückstrahlen. Am Ausgang des Demodulators 8 wird ein elektrisches Signal stehen, dessen Niveau ein Mass für das totale empfangene reflektierte demodulierte Rauminfra­ rotlicht ist, das von 3 in einem bestimmten Raum gestrahlt wird. Mit einem Niveaudetektor hinter Demodulator 8 in Figur 1, kann unterschieden werden zwischen einer Situation, wobei der aktive Infrarotlicht-Objektmelder reagiert und einer wobei er nicht reagieren soll. Dies bedeutet dass der aktive Infrarotlicht-Objektmelder für jede räumliche Situation, wobei er nicht zu reagieren braucht, eingestellt werden kann. Wenn jetzt im betreffenden Raum ein Objekt im Raum hinzu­ gefügt wird, wird das totale reflektierende demodulierte In­ frarotlicht an Intensität auf Infrarotlichtempfänger 7 zuneh­ men. Dies bedeutet, dass am Ausgang des Demodulators 8, in Figur 1, ein grösseres Signal steht, dessen Amplitude pro­ portional zur Intensität, des auf Infrarotlichtempfängerstufe 7 hineinkommenden demodulierten Lichtes ist. Niveaudetek­ tor 9 kann so eingestellt werden, dass auf 10 eine elektrische Signaländerung stattfindet. Dies bedeutet, dass sich im Raum, in dem 3 das Infrarotlicht ausstrahlt, ein oder mehrere Objekte befinden, die eine elektrische Signaländerung auf 10 verursachen. Die Schaltung arbeitet stets so, dass das Ausgangssignal des Demodulators 8 ein Mass für das totale, aus dem betreffenden Raum empfangende demodulierte re­ flektierende Infrarotlicht auf 7 ist. FIG. 1 shows the infrared light object described the. 1 represents an arbitrary generator. Via line 2 an infrared light source 3 is controlled with this signal. This emits 3 infrared light that on one or the other which is modulated with said signal of FIG. 1. When infrared light is emitted, this reflects against all objects with a fairly solid shape, like object 5. That Infrared light from 3 falls as light beam 4 on object 5, right inflects, and falls as light beam 6 on the entrance of the infra red light receiver 7. In the invention is not a single ner beam of light, but a spatial beam of light broadcast at an arbitrary angle over 3. Thus the affected room as far as possible with that of 3 emitted infrared light filled. Receiver 7, in figure 1, receives the total infrared light reflection of the objects that in the room in question the infrared light after receiver 7 reflect back. At the output of the demodulator 8 is a electrical signal, the level of which is a measure of that total received reflected demodulated room infra is red light that radiates from 3 in a certain room becomes. With a level detector behind demodulator 8 in Figure 1, can be distinguished between a situation, the active infrared light detector responds and one whereby he should not react. This means that the active one Infrared light object detector for every spatial situation, whereby it does not have to react, can be adjusted. If now add an object in the room in the room is added, the total reflective demodulated In infrared light increasing in intensity on infrared light receiver 7 men. This means that at the output of the demodulator 8, in Figure 1, there is a larger signal, the amplitude of each proportional to the intensity of that at infrared light receiver level 7 incoming demodulated light. Niveaudetek gate 9 can be set so that 10 is an electrical Signal change takes place. This means that in Room in which 3 emits infrared light, one or more Objects that have an electrical signal change to 10 cause. The circuit always works in such a way that Output signal of the demodulator 8 a measure of the total, demodulated re receiving from the room in question infra-red infrared light at 7.

EP87201088A 1986-06-24 1987-06-10 Active infrared light object detector Withdrawn EP0251371A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8601634 1986-06-24
NL8601634A NL8601634A (en) 1986-06-24 1986-06-24 ACTIVE INFRARED LIGHT OBJECT DETECTOR.

Publications (2)

Publication Number Publication Date
EP0251371A2 EP0251371A2 (en) 1988-01-07
EP0251371A3 true EP0251371A3 (en) 1988-10-05

Family

ID=19848208

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87201088A Withdrawn EP0251371A3 (en) 1986-06-24 1987-06-10 Active infrared light object detector

Country Status (2)

Country Link
EP (1) EP0251371A3 (en)
NL (1) NL8601634A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102938656B (en) * 2012-11-07 2015-02-18 郑州正义电子科技有限公司 Police monitoring device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444544A (en) * 1965-07-19 1969-05-13 American District Telegraph Co Light modulated intrusion detection system
DE2200914A1 (en) * 1972-01-10 1973-07-19 Fietz Erwin Herbert DEVICE FOR MONITORING ROOMS, PLOTS ETC.
US3774039A (en) * 1973-03-05 1973-11-20 Scient Techn Inc Photoelectric apparatus for detecting light reflected from an object
DE3124714A1 (en) * 1981-06-24 1983-01-13 Vilém 8000 München Klir Automatic light switch
US4479053A (en) * 1981-03-11 1984-10-23 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Focal plane array optical proximity sensor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444544A (en) * 1965-07-19 1969-05-13 American District Telegraph Co Light modulated intrusion detection system
DE2200914A1 (en) * 1972-01-10 1973-07-19 Fietz Erwin Herbert DEVICE FOR MONITORING ROOMS, PLOTS ETC.
US3774039A (en) * 1973-03-05 1973-11-20 Scient Techn Inc Photoelectric apparatus for detecting light reflected from an object
US4479053A (en) * 1981-03-11 1984-10-23 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Focal plane array optical proximity sensor
DE3124714A1 (en) * 1981-06-24 1983-01-13 Vilém 8000 München Klir Automatic light switch

Also Published As

Publication number Publication date
EP0251371A2 (en) 1988-01-07
NL8601634A (en) 1988-01-18

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