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WO2001035362A1 - Barriere lumineuse - Google Patents

Barriere lumineuse Download PDF

Info

Publication number
WO2001035362A1
WO2001035362A1 PCT/EP2000/005748 EP0005748W WO0135362A1 WO 2001035362 A1 WO2001035362 A1 WO 2001035362A1 EP 0005748 W EP0005748 W EP 0005748W WO 0135362 A1 WO0135362 A1 WO 0135362A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
light barrier
receiver
transmitter
actual
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.)
Ceased
Application number
PCT/EP2000/005748
Other languages
German (de)
English (en)
Inventor
Joachim Tiedecke
Egbert Ronald Ivo Casimir Visscher
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.)
IDM GmbH
Original Assignee
IDM GmbH
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 IDM GmbH filed Critical IDM GmbH
Priority to AU54061/00A priority Critical patent/AU5406100A/en
Publication of WO2001035362A1 publication Critical patent/WO2001035362A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/941—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated using an optical detector
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/04—Systems determining the presence of a target
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
    • 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
    • G08B13/184—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 using radiation reflectors
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B19/00—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
    • G08B19/005—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow combined burglary and fire alarm systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/046—Monitoring of the detection circuits prevention of tampering with detection circuits
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/20—Calibration, including self-calibrating arrangements
    • G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components
    • G08B29/26—Self-calibration, e.g. compensating for environmental drift or ageing of components by updating and storing reference thresholds
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/941—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated using an optical detector
    • H03K2217/94102—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated using an optical detector characterised by the type of activation
    • H03K2217/94104—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated using an optical detector characterised by the type of activation using a light barrier

Definitions

  • the present invention relates to a light barrier with the features of the preamble of claim 1.
  • Such light barriers are known from practice, the signals of which, contrary to the general designation, do not necessarily have to consist of light, but rather can comprise general electromagnetic waves.
  • a transmitter for a beam of electromagnetic waves in particular radar, infrared or visible light, is usually provided, which emits the beam along the measurement section.
  • a receiver is provided that receives and evaluates the light beam. Transmitter and receiver can be at opposite ends of a straight line.
  • the beam can also be deflected depending on the application or via a retroreflector be reflected so that the transmitter and receiver can be arranged in a common housing.
  • the known light barriers emit a continuous beam, which generates a constant received signal in the receiver. As soon as the light barrier is interrupted, which is indicated by the absence of the beam at the receiver, a signal is triggered.
  • the signals can serve various purposes. For example, an area can be monitored for people entering it.
  • the triggering of the signal can be prevented by deflecting the beam via mirrors or reflectors to the receiver in such a way that a corridor is created which allows access without interrupting the light barrier beam.
  • This task is solved by modulating the transmission signal.
  • at least one further property of the reception signal can also be measured, for example the attenuation or the phase position. A change in one of these parameters can then be evaluated even in the case of an otherwise uninterrupted light beam in order to decide whether a signal should be triggered or not.
  • the transmission signal when it is pulsed.
  • the signal pulses can be analyzed on the basis of the transit time and the slope or the amplitude.
  • the transmitter and the receiver are arranged on the same side of the measuring section and a reflector is provided on the opposite side.
  • the reception signal is analyzed on the receiver side as an actual signal according to amplitude and transit time or according to the signal shape and if the actual signal deviates from at least one stored setpoint, a signal is triggered , If the setpoint is changed during operation with a long time constant based on the actual signal compared to an expected disturbance, changes or fluctuations in the area of the light barrier can be taken into account.
  • the target signal can be adjusted if the effectiveness of the transmitter or receiver declines as a result of aging processes or if the optics gradually become dirty.
  • the transmission signal can be emitted with a wavelength in the radar range, in the infrared range or in the visible range.
  • the object is also achieved by a method for operating a light barrier with the features of claim 7.
  • changes in the light beam such as e.g. B. Shortening the measuring path, lengthening the measuring path or a redirection to one evaluable signal. A slow adjustment of the setpoint to unavoidable changes is possible if the setpoint is continuously updated as a moving average of a large number of previously measured actual values.
  • Figure 1 A light barrier in a principle representation
  • Figure 2 a measurement signal compared to
  • Reduced amplitude reference signal such as
  • Figure 3 a measurement signal compared to
  • the transmitting and receiving unit 1 comprises a transmitter 3 with beam generating means, not shown, for example a laser diode and a corresponding beam-shaping optics. Furthermore, a receiver 4 is provided in the transmitting and receiving unit 1, which is also not closer to one contains the detector shown for transmission signals, for example in the form of an optic and a photodiode. Finally, the transmitting and receiving unit 1 also contains an electronic controller 5, which is set up to control the transmitting unit 3 and the receiving unit 4 and for external signal output.
  • the transmission unit 3 generates a light beam 6, which is directed onto the opposite retroreflector 2. In practice this reflects the light beam 6 m approximately parallel along the line 6 ⁇ back to the receiving unit 4, where the light beam is received and evaluated.
  • the transmitting and receiving unit 1 and the reflector 2 define between them a 6 and 6 ⁇ represent the monitored area, while the light beams to the measurement path.
  • FIG. 2 shows two signals recorded with the receiving unit 3, in which the X-axis represents the time and the Y-axis the measured intensity.
  • FIG. 2 shows a signal 10 with a larger amplitude and a signal 11 with a lower amplitude.
  • the runtime of the two signals is identical.
  • the signal 10 represents the undisturbed signal or the desired value of a pulsed transmission signal emitted by the transmission unit 3, reflected on the reflector 2 and registered in the reception unit 4.
  • the signal 11, in contrast, is attenuated, which with unchanged length of the measurement path 6, 6 ⁇ for an intervention m speaks the transmission properties along the signal path. For example, this signal can be generated by smoke.
  • FIG. 3 shows a representation corresponding to FIG. 2 corresponding to FIG. 2 a representation corresponding to FIG. 2 corresponding to FIG. 2 , in which a desired signal 12 and an actual signal 13 are shown.
  • the actual signal 13 has a shorter transit time between the transmitting unit 3 and the receiving unit 4 compared to the signal 12.
  • the transmission and reception unit 1 sends out a pulsed transmission signal with a specific pulse duration and pulse amplitude via the controller 5 and the transmission unit 3. With undisturbed measuring path 6, 6 ⁇ , this signal is reflected at the reflector 2 and recorded in the receiver 4. This signal is stored in the controller 5 as the desired signal and corresponds to the signals 10 and 12 in FIGS. 2 and 3.
  • the transmission of the pulsed signal is repeated regularly in the following operation, the signal received in the controller 5 being compared with the desired signal.
  • Slow changes due to aging of the electronics, temperature fluctuations or soiling of the optics or the reflector 2 are adapted by adapting the target signal with a long time constant or by forming moving averages without leading to an alarm being triggered.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Computer Security & Cryptography (AREA)
  • Analytical Chemistry (AREA)
  • Geophysics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

L'invention concerne une barrière lumineuse comportant un émetteur et un récepteur, ainsi qu'une section d'essai placée entre l'émetteur et le récepteur. L'émetteur envoie au récepteur un signal d'émission le long de la section d'essai. Un circuit électronique est prévu pour surveiller le signal d'émission, ledit signal d'émission étant modulé.
PCT/EP2000/005748 1999-11-10 2000-06-21 Barriere lumineuse Ceased WO2001035362A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU54061/00A AU5406100A (en) 1999-11-10 2000-06-21 Photoelectric barrier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19954156.6 1999-11-10
DE19954156A DE19954156A1 (de) 1999-11-10 1999-11-10 Lichtschranke

Publications (1)

Publication Number Publication Date
WO2001035362A1 true WO2001035362A1 (fr) 2001-05-17

Family

ID=7928610

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/005748 Ceased WO2001035362A1 (fr) 1999-11-10 2000-06-21 Barriere lumineuse

Country Status (3)

Country Link
AU (1) AU5406100A (fr)
DE (1) DE19954156A1 (fr)
WO (1) WO2001035362A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004047911B4 (de) * 2004-09-29 2007-06-06 Magna Car Top Systems Gmbh Kollisionsschutzeinrichtung für einen Ablageraum für ein öffnungsfähiges Fahrzeugdach
JP2006145483A (ja) * 2004-11-24 2006-06-08 Sharp Corp パルス変調型光検出装置、電子機器、パルス変調型光検出方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4356393A (en) * 1980-05-29 1982-10-26 Banner Engineering Corp. Alignment indicator for photoelectric scanners
US4742337A (en) * 1985-08-28 1988-05-03 Telenot Electronic Gmbh Light-curtain area security system
US4879461A (en) * 1988-04-25 1989-11-07 Harald Philipp Energy field sensor using summing means

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2059656A1 (de) * 1970-12-04 1972-06-29 Alfons Endl Lichtschranke mit einer Schaltung zum Konstanthalten der Schaltwelle
DE4119797C2 (de) * 1991-06-15 1994-02-24 Leuze Electronic Gmbh & Co Einen Sender, einen Empfänger und eine Schaltungsanordnung zur Signalauswertung aufweisende Überwachungseinrichtung
US5336882A (en) * 1992-12-30 1994-08-09 Allen-Bradley Company, Inc. System for determining operational stability of a photoelectric control unit having a margin variable gain module
DE19517001A1 (de) * 1995-05-09 1996-11-14 Sick Optik Elektronik Erwin Verfahren und Vorrichtung zur Bestimmung der Lichtlaufzeit über eine zwischen einer Meßvorrichtung und einem reflektierenden Objekt angeordnete Meßstrecke
DE19621120C1 (de) * 1996-05-24 1997-05-07 Leuze Electronic Gmbh & Co Optoelektronische Vorrichtung
DE19644791C2 (de) * 1996-10-28 2002-11-28 Sick Ag Verfahren und Vorrichtung zur Bestimmung der Lichtlaufzeit über eine zwischen einer Meßvorrichtung und einem reflektierenden Objekt angeordnete Meßstrecke
DE19718391A1 (de) * 1997-04-30 1998-11-05 Sick Ag Verfahren zum Betrieb eines opto-elektronischen Sensors
DE19729638A1 (de) * 1997-07-10 1999-01-14 Sick Ag Verfahren zum Betrieb eines opto-elektronischen Sensors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4356393A (en) * 1980-05-29 1982-10-26 Banner Engineering Corp. Alignment indicator for photoelectric scanners
US4742337A (en) * 1985-08-28 1988-05-03 Telenot Electronic Gmbh Light-curtain area security system
US4879461A (en) * 1988-04-25 1989-11-07 Harald Philipp Energy field sensor using summing means

Also Published As

Publication number Publication date
AU5406100A (en) 2001-06-06
DE19954156A1 (de) 2001-05-17

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