FR2283494A2 - Photoelectric scanning of control zone - by comparing count signals with scanning switch states to decide if scanning continues - Google Patents

Photoelectric scanning of control zone - by comparing count signals with scanning switch states to decide if scanning continues

Info

Publication number
FR2283494A2
FR2283494A2 FR7430405A FR7430405A FR2283494A2 FR 2283494 A2 FR2283494 A2 FR 2283494A2 FR 7430405 A FR7430405 A FR 7430405A FR 7430405 A FR7430405 A FR 7430405A FR 2283494 A2 FR2283494 A2 FR 2283494A2
Authority
FR
France
Prior art keywords
scanning
control zone
count signals
decide
continues
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.)
Granted
Application number
FR7430405A
Other languages
French (fr)
Other versions
FR2283494B2 (en
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.)
COMETA SA
Original Assignee
COMETA SA
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 COMETA SA filed Critical COMETA SA
Priority to FR7430405A priority Critical patent/FR2283494A2/en
Priority to DE2552314A priority patent/DE2552314C3/en
Publication of FR2283494A2 publication Critical patent/FR2283494A2/en
Application granted granted Critical
Publication of FR2283494B2 publication Critical patent/FR2283494B2/fr
Granted 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
    • F16P3/144—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using light grids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/28—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication
    • G01D5/30—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication the beams of light being detected by photocells
    • 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
    • G01V8/18—Detecting, e.g. by using light barriers using one transmitter and one receiver using mechanical scanning systems

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Mechanical Engineering (AREA)
  • Electronic Switches (AREA)
  • Burglar Alarm Systems (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

The control zone is scanned using a continuous train of optical pulses provided by one of several light emitting diodes (3) and reflected by a mirror onto a respective phototransistor (5) with an electronic switching circuit for cyclic switching of the electric pulse train used for exciting the light-emitting diodes. The progression of the switching circuit is checked by comparing each stage reached by the latter with count signals obtained independently and the circuit is allowed to step onwards to the next stage only upon their concordance, the sequence being stopped and an alarm signal provided when they differ. Pref. during each scanning cycle a test fault is supplied and a further scanning cycle is only initiated if the fault is detected.
FR7430405A 1974-09-02 1974-09-02 Photoelectric scanning of control zone - by comparing count signals with scanning switch states to decide if scanning continues Granted FR2283494A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR7430405A FR2283494A2 (en) 1974-09-02 1974-09-02 Photoelectric scanning of control zone - by comparing count signals with scanning switch states to decide if scanning continues
DE2552314A DE2552314C3 (en) 1974-09-02 1975-11-21 Photoelectric barrier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7430405A FR2283494A2 (en) 1974-09-02 1974-09-02 Photoelectric scanning of control zone - by comparing count signals with scanning switch states to decide if scanning continues
DE2552314A DE2552314C3 (en) 1974-09-02 1975-11-21 Photoelectric barrier

Publications (2)

Publication Number Publication Date
FR2283494A2 true FR2283494A2 (en) 1976-03-26
FR2283494B2 FR2283494B2 (en) 1977-03-25

Family

ID=27623624

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7430405A Granted FR2283494A2 (en) 1974-09-02 1974-09-02 Photoelectric scanning of control zone - by comparing count signals with scanning switch states to decide if scanning continues

Country Status (2)

Country Link
DE (1) DE2552314C3 (en)
FR (1) FR2283494A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2434332A1 (en) * 1978-08-25 1980-03-21 Datalogic Spa PHOTOELECTRIC BARRIER BELONGING TO AN ACCIDENT SAFETY DEVICE FOR MACHINE TOOLS
WO1981000750A1 (en) * 1979-09-10 1981-03-19 Ambler K Improvements relating to safety mechanisms for industrial machinery

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4591708A (en) * 1980-11-17 1986-05-27 Del Mar Avionics High-intensity opto-electronic sensor having low power consumption
DE3131534A1 (en) * 1981-08-08 1983-03-17 Gebhard Balluff Fabrik feinmechanischer Erzeugnisse GmbH & Co, 7303 Neuhausen Light barrier having an optotransmitter and an optoreceiver
DE3312191A1 (en) * 1983-04-02 1984-10-11 Karl Mengele & Söhne Maschinenfabrik und Eisengießerei GmbH & Co, 8870 Günzburg PROTECTIVE DEVICE FOR MECHANICAL CABINETS AND THE LIKE DEVICES OR MACHINERY
DE3601516A1 (en) * 1986-01-20 1987-07-23 Agie Ag Ind Elektronik PHOTOELECTRIC BARRIER
DE3611408A1 (en) * 1986-04-04 1987-10-15 Kaltenbach & Voigt CIRCUIT ARRANGEMENT FOR DETERMINING THE EXISTENCE OR. THE EXTRACTION OF OBJECTS, IN PARTICULAR OF DENTAL TREATMENT INSTRUMENTS, IN OR FROM RECORDINGS
DE3825099A1 (en) * 1988-07-23 1990-01-25 Daimler Benz Ag Device for the optoelectronic detection of physical measured variables
DE3841665A1 (en) * 1988-12-10 1990-07-26 Fresenius Ag Circuit for monitoring the function of a light barrier
US5015840B1 (en) * 1990-01-09 1995-04-11 Scient Technologies Inc Self-checking light curtain system and method of operation.
DE4013507C2 (en) * 1990-03-03 1995-04-06 Bayerische Mas Ind Arno Keller Container with liquid
DE4221113C1 (en) * 1992-06-26 1993-12-09 Sick Optik Elektronik Erwin Comparator circuit e.g. for optical detector which signals presence of object - uses two comparators to provide two different outputs when input rises above or drops below switch threshold
DE4323910C2 (en) * 1993-07-16 1995-08-10 Leuze Electronic Gmbh & Co Photoelectric sensor with evaluation electronics for the detection of interference signals
DE4326099A1 (en) * 1993-08-04 1995-02-09 Hella Kg Hueck & Co Light barrier system
DE4338978C2 (en) * 1993-11-15 1998-05-07 Sick Ag Method for the detection of defective light transmitters and / or light receivers of a light grid and light grid
DE4432114C1 (en) * 1994-09-09 1995-06-08 Hella Kg Hueck & Co Stray light suppression circuit for light barrier arrangement
DE102012101431B4 (en) * 2012-02-23 2020-07-02 Leuze Electronic Gmbh & Co. Kg Sensor arrangement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2135819A5 (en) * 1971-04-30 1972-12-22 Cometa Sa
DE2247053C3 (en) * 1972-09-26 1979-08-09 Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch Light barrier
US3886413A (en) * 1973-01-29 1975-05-27 Xenex Corp Presence sensing and self-checking control system
SE372085B (en) * 1973-02-27 1974-12-09 L Svensson

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
A32-5 *
I, ARTICLE: "FAULT DETECTION AND LOCATION TECHNIQUES FOR A PATH CONTROL UNIT" KARDOS .) *
PUBLICATION US: "I.F.A.C. SYMPOSIUM ON PULSE RATE AND PULSE NUMBER SIGNALS IN AUTOMATIC CONTROL", BUDAPEST, 8-11 AVRIL 1968, HUNGARIAN ACADEMY OF SCIENCES, AUTOMATION RESEARCH INSTITUTE *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2434332A1 (en) * 1978-08-25 1980-03-21 Datalogic Spa PHOTOELECTRIC BARRIER BELONGING TO AN ACCIDENT SAFETY DEVICE FOR MACHINE TOOLS
WO1981000750A1 (en) * 1979-09-10 1981-03-19 Ambler K Improvements relating to safety mechanisms for industrial machinery

Also Published As

Publication number Publication date
DE2552314A1 (en) 1977-06-02
FR2283494B2 (en) 1977-03-25
DE2552314C3 (en) 1982-02-25
DE2552314B2 (en) 1980-02-07

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