EP0200186A3 - Light barrier - Google Patents

Light barrier Download PDF

Info

Publication number
EP0200186A3
EP0200186A3 EP86105818A EP86105818A EP0200186A3 EP 0200186 A3 EP0200186 A3 EP 0200186A3 EP 86105818 A EP86105818 A EP 86105818A EP 86105818 A EP86105818 A EP 86105818A EP 0200186 A3 EP0200186 A3 EP 0200186A3
Authority
EP
European Patent Office
Prior art keywords
radiation
light barrier
branches
alarm signal
sensor elements
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
EP86105818A
Other languages
German (de)
Other versions
EP0200186B1 (en
EP0200186A2 (en
Inventor
Kurt Muller
Peter Wagli
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.)
Cerberus AG
Original Assignee
Cerberus AG
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 Cerberus AG filed Critical Cerberus AG
Priority to AT86105818T priority Critical patent/ATE64023T1/en
Publication of EP0200186A2 publication Critical patent/EP0200186A2/en
Publication of EP0200186A3 publication Critical patent/EP0200186A3/en
Application granted granted Critical
Publication of EP0200186B1 publication Critical patent/EP0200186B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Abstract

In a light barrier, especially for outside application and long distances monitored, insensitivity to interfering light and scattering through fumes or fog and an increased range and sensitivity to objects passing through the light barrier are achieved by subdividing radiation from a source into two radiation branches which are offset relative to each other and differently polarized, e.g., by means of a polarization filter divided into two parts, with different linear or oppositely circular polarization of the filter part surfaces. By means of an analogously subdivided polarization filter, the radiation of each of the two radiation branches is focused on a different individual sensor element. The two sensor elements are connected in a differential circuit which triggers an alarm signal in response to signals arriving from both radiation branches in short succession but does not trigger an alarm signal if both sensor elements are equally irradiated.
EP86105818A 1985-04-30 1986-04-26 Light barrier Expired - Lifetime EP0200186B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86105818T ATE64023T1 (en) 1985-04-30 1986-04-26 PHOTOELECTRIC BARRIER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1825/85 1985-04-30
CH1825/85A CH667340A5 (en) 1985-04-30 1985-04-30 PHOTOELECTRIC BARRIER.

Publications (3)

Publication Number Publication Date
EP0200186A2 EP0200186A2 (en) 1986-11-05
EP0200186A3 true EP0200186A3 (en) 1987-01-21
EP0200186B1 EP0200186B1 (en) 1991-05-29

Family

ID=4219477

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86105818A Expired - Lifetime EP0200186B1 (en) 1985-04-30 1986-04-26 Light barrier

Country Status (5)

Country Link
US (1) US4734575A (en)
EP (1) EP0200186B1 (en)
AT (1) ATE64023T1 (en)
CH (1) CH667340A5 (en)
DE (1) DE3679443D1 (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3641926C1 (en) * 1986-12-09 1988-04-28 Sick Optik Elektronik Erwin Autocollimation light curtain
DE3733656C1 (en) * 1987-10-05 1989-02-02 Hoermann Kg Retro-reflective sensor
EP0388352A1 (en) * 1989-03-15 1990-09-19 Elesta Ag Elektronik One way light barrier arrangement
NL8902314A (en) * 1989-09-15 1991-04-02 Michiel Kassies METHOD AND APPARATUS FOR DETECTING AN ARTICLE
US5955854A (en) * 1992-09-29 1999-09-21 Prospects Corporation Power driven venting of a vehicle
US6316762B1 (en) * 1997-11-07 2001-11-13 Leuze Electronic Gmbh & Co. Optoelectronic device
DE102004017183A1 (en) * 2004-04-07 2005-11-10 Siemens Ag Overall system, especially medical equipment
WO2009144707A1 (en) * 2008-04-17 2009-12-03 Shilat Optronics Ltd Intrusion warning system
CN102292980B (en) 2008-11-25 2015-04-01 泰特拉维公司 Systems and methods of high resolution three-dimensional imaging
JP5458813B2 (en) * 2009-11-10 2014-04-02 オムロン株式会社 Photoelectric sensor
EP2813868B1 (en) * 2013-06-11 2021-08-04 Rockwell Automation Switzerland GmbH Method for synchronizing optical units of a photoelectric barrier and light curtain
US10104365B2 (en) 2014-04-26 2018-10-16 Tetravue, Inc. Method and system for robust and extended illumination waveforms for depth sensing in 3D imaging
DE102014013326A1 (en) * 2014-09-15 2016-03-17 Imos Gubela Gmbh Optical sensor system
KR20190003480A (en) 2016-02-29 2019-01-09 테트라뷰 인코포레이티드 3D imaging system and method
US11212512B2 (en) 2017-12-28 2021-12-28 Nlight, Inc. System and method of imaging using multiple illumination pulses

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457502A (en) * 1944-08-09 1948-12-28 Shepherd Judson O'd Signal system employing polarized light
US3440427A (en) * 1966-04-12 1969-04-22 Philips Corp Remote control system with a unitary cell bridge circuit
GB1214981A (en) * 1967-05-05 1970-12-09 John Horrocks Control means using light filters
DE1946993A1 (en) * 1969-09-17 1971-03-25 Sick Erwin Fa Light barrier for analog measuring purposes
US4342987A (en) * 1979-09-10 1982-08-03 Rossin Corporation Intruder detection system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4333008A (en) * 1975-04-21 1982-06-01 Sanders Associates, Inc. Polarization coded doublet laser detection system
FR2347666A1 (en) * 1976-04-09 1977-11-04 France Etat AUTOMATIC TWO WAVELENGTH PHOTOELASTICIMETER
US4339660A (en) * 1980-05-15 1982-07-13 Erwin Sick Gmbh Optik-Elektronik Reflection light barrier apparatus for recognizing both strongly and weakly reflecting objects

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457502A (en) * 1944-08-09 1948-12-28 Shepherd Judson O'd Signal system employing polarized light
US3440427A (en) * 1966-04-12 1969-04-22 Philips Corp Remote control system with a unitary cell bridge circuit
GB1214981A (en) * 1967-05-05 1970-12-09 John Horrocks Control means using light filters
DE1946993A1 (en) * 1969-09-17 1971-03-25 Sick Erwin Fa Light barrier for analog measuring purposes
US4342987A (en) * 1979-09-10 1982-08-03 Rossin Corporation Intruder detection system

Also Published As

Publication number Publication date
US4734575A (en) 1988-03-29
EP0200186B1 (en) 1991-05-29
CH667340A5 (en) 1988-09-30
EP0200186A2 (en) 1986-11-05
ATE64023T1 (en) 1991-06-15
DE3679443D1 (en) 1991-07-04

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