EP0251371A2 - Détecteur actif d'objet à lumière infrarouge - Google Patents

Détecteur actif d'objet à lumière infrarouge Download PDF

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Publication number
EP0251371A2
EP0251371A2 EP87201088A EP87201088A EP0251371A2 EP 0251371 A2 EP0251371 A2 EP 0251371A2 EP 87201088 A EP87201088 A EP 87201088A EP 87201088 A EP87201088 A EP 87201088A EP 0251371 A2 EP0251371 A2 EP 0251371A2
Authority
EP
European Patent Office
Prior art keywords
infrared light
receiver
room
infrared
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.)
Withdrawn
Application number
EP87201088A
Other languages
German (de)
English (en)
Other versions
EP0251371A3 (fr
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
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0251371A2 publication Critical patent/EP0251371A2/fr
Publication of EP0251371A3 publication Critical patent/EP0251371A3/fr
Withdrawn legal-status Critical Current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

Definitions

  • infrared light detection systems are used for the detection of stationary and moving objects.
  • the big disadvantage of passive infrared light object detection systems is the temperature sensitivity. After all, a passive infrared object detector system works according to a temperature system.
  • Most active infrared object detection systems have the disadvantage that they are often quite expensive. It is often systems that emit a narrow bundle of infrared light as a transmitter. The interruption of the beam between the infrared light transmitter and receiver is the detection of an object.
  • the invention described here uses an infrared light transmitter and receiver. The system is very simple, precise and universally applicable.
  • the active infrared light object detector described here can be used as a burglar alarm system, or, for example, in certain rooms, if there are people, to switch on the light automatically.
  • the active infrared light object detector described has an infrared light transmitter whose light is modulated one or more times.
  • Figure 1 shows a block diagram of the infrared light detector described.
  • 1 represents an arbitrary generator whose frequency is, for example, 1 kHz or 10 kHz.
  • An infrared light source 3 is controlled via line 2 with this signal.
  • 3 emits infrared light that is modulated in one way or another with the aforementioned signal from FIG.
  • the modulation of 3 is necessary in order to be able to distinguish the infrared light emitted via 3 from another emitted infrared light. If infrared light is emitted, this reflects against all objects with a fairly solid shape.
  • FIG. 1 shows an object 5 as an example Infrared light from 3 from FIG.
  • the modulated infrared light emitted by the transmitter 3 can be distinguished from another infrared light located in the room that has nothing in common with the task.
  • an electrical signal At the output of the demodulator 8 there will be, in FIG. 1, an electrical signal, the level of which is a measure of the total received reflected demodulated room infrared light, which is emitted by 3 in a specific room.
  • a level detector behind demodulator 8 in FIG. 1 a distinction can be made between a situation in which the active infrared light object detector reacts and one in which it should not react. In FIG. 1, this means that the active infrared light object detector can be set for every spatial situation, whereby it does not need to react.
  • the level detector 9 is set such that the existing electrical level at the output of the demodulator 8 does not result in an electrical output signal at the output of the level detector 9 (point 10). If an object in the room is now added in the relevant room, in the active infrared light object detector from FIG. 1, the total reflecting demodulated infrared light will increase in intensity on infrared light receiver 7. This means that at the output of the demodulator 8, in FIG. 1, there is a larger signal, the amplitude of which is proportional to the intensity of the demodulated light entering the infrared light receiver stage 7. Level detector 9 can be set so that an electrical signal change takes place at 10.
  • the circuit according to Figure 1 can be used in or outside the house. Outside of the house, in the open air, the circuit works even better, because one. any moving or non-moving object to be signaled reflects much more than the background occurring outside the home. In practice, the backgrounds are usually so far away that their level of reflection plays almost no role. In practice, the circuit, according to FIG. 1, can be used to signal intruders. The circuit can also be used to switch on the lighting in certain rooms. So you can switch on the lighting of a toilet with the infrared light object detector if one or more people are present. This principle is very simple. Man lets infrared light transmitter 3 light shine in the room in question.
  • the level detector 9 is then set in such a way that, if there is no person in the toilet, the electrical level at the output of the demodulator 8, via 9, to 10 means that no electrical signal change takes place. As soon as one or more people are in the toilet in question, the reflection level increases to 7 and the output of the demodulator 8 thus adapts. If level detector 9 now recognizes the level of 8, an electrical signal change is output at output 10. This signal change switches on the lighting via arbitrary equipment.
  • the basis of the active infrared light object detector is that a modulated infrared light is emitted in a room and that the infrared light reflection is demodulated by a demodulator 8 from FIG. 1.
  • the output level of 8 is a measure of the total received demodulated reflected infrared light in the receiver 7.
  • several transmitters 3 can be used. These have to be synchronized to the same modulator signal. You can also use several receivers 7 in cooperation with one or more transmitters 3. The principle always remains the same.
  • the reflected demodulated infrared light is continuously received and converted into an electrical level which is a measure of the received demodulated infrared light.
  • the level difference in FIG. 1 which is an electrical level change at the output of the demodulator 8, can be used as a measure of whether the active infrared light object detector reacts to a specific spatial object situation.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)
EP87201088A 1986-06-24 1987-06-10 Détecteur actif d'objet à lumière infrarouge Withdrawn EP0251371A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8601634 1986-06-24
NL8601634A NL8601634A (nl) 1986-06-24 1986-06-24 Aktieve infraroodlichtobjektmelder.

Publications (2)

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

Family

ID=19848208

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87201088A Withdrawn EP0251371A3 (fr) 1986-06-24 1987-06-10 Détecteur actif d'objet à lumière infrarouge

Country Status (2)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102938656A (zh) * 2012-11-07 2013-02-20 郑州正义电子科技有限公司 警用监听装置

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 (de) * 1972-01-10 1973-07-19 Fietz Erwin Herbert Einrichtung zur ueberwachung von raeumen, grundstuecken etc
US3774039A (en) * 1973-03-05 1973-11-20 Scient Techn Inc Photoelectric apparatus for detecting light reflected from an object
DE3124714A1 (de) * 1981-06-24 1983-01-13 Vilém 8000 München Klir Automatischer lichtschalter
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 (de) * 1972-01-10 1973-07-19 Fietz Erwin Herbert Einrichtung zur ueberwachung von raeumen, grundstuecken 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 (de) * 1981-06-24 1983-01-13 Vilém 8000 München Klir Automatischer lichtschalter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102938656A (zh) * 2012-11-07 2013-02-20 郑州正义电子科技有限公司 警用监听装置

Also Published As

Publication number Publication date
EP0251371A3 (fr) 1988-10-05
NL8601634A (nl) 1988-01-18

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