DE20215464U1 - Optical sensor for detecting objects has circular polarizers arranged in front of light beam emitter and receiver - Google Patents

Optical sensor for detecting objects has circular polarizers arranged in front of light beam emitter and receiver

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Publication number
DE20215464U1
DE20215464U1 DE20215464U DE20215464U DE20215464U1 DE 20215464 U1 DE20215464 U1 DE 20215464U1 DE 20215464 U DE20215464 U DE 20215464U DE 20215464 U DE20215464 U DE 20215464U DE 20215464 U1 DE20215464 U1 DE 20215464U1
Authority
DE
Germany
Prior art keywords
sensor according
light sensor
receiver
light
range
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.)
Expired - Lifetime
Application number
DE20215464U
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German (de)
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.)
Leuze Electronic GmbH and Co KG
Original Assignee
Leuze Electronic GmbH and Co KG
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 Leuze Electronic GmbH and Co KG filed Critical Leuze Electronic GmbH and Co KG
Priority to DE20215464U priority Critical patent/DE20215464U1/en
Publication of DE20215464U1 publication Critical patent/DE20215464U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

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  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

The optical sensor has an emitter (4) for emitting a light beam, and a spatially-resolving receiver (6) for receiving a light beam. A circular polarizer is provided after the emitter, for circularly polarizing the emitted light beam in a predetermined rotation direction. A circular polarizer is also arranged in front of the receiver and is circularly polarized in the same rotation direction corresponding to the received light beam. The polarizers may be formed from respective polarization films (14).

Description

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßt The description text was not recorded electronically  

Der Beschreibungstext wurde nicht elektronisch erfaßtThe description text was not recorded electronically

Claims (17)

1. Lichttaster mit einem Sendelichtstrahlen emittierenden Sender und einem Empfangslichtstrahlen empfangenden ortsauflösenden Empfänger, da­ durch gekennzeichnet, dass dem Sender (4) ein Zirkularpolarisator nach­ geordnet ist, mittels dessen die Sendelichtstrahlen (3) in einer vorgegebe­ nen Drehrichtung zirkularpolarisiert sind, und dass dem Empfänger (6) ein entsprechend die Empfangslichtstrahlen (5) in der selben Drehrich­ tung zirkularpolarisierender Zirkularpolarisator vorgeordnet ist.1. light scanner with a transmitter light emitting transmitter and a receiving light receiving receiver, characterized in that the transmitter ( 4 ) is arranged a circular polarizer, by means of which the transmitted light beams ( 3 ) are circularly polarized in a predetermined direction of rotation, and that the receiver ( 6 ) a circular polarizer corresponding to the received light beams ( 5 ) in the same direction of rotation is arranged upstream. 2. Lichttaster nach Anspruch 1, dadurch gekennzeichnet, dass die Zirkular­ polarisatoren jeweils von einer Polarisationsfolie (14) gebildet sind.2. Light sensor according to claim 1, characterized in that the circular polarizers are each formed by a polarizing film ( 14 ). 3. Lichttaster nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Zirkularpolarisatoren von einer gemeinsamen Polarisationsfolie (14) gebildet sind.3. Light sensor according to one of claims 1 or 2, characterized in that the circular polarizers are formed by a common polarizing film ( 14 ). 4. Lichttaster nach einem der Ansprüche 1-3, dadurch gekennzeichnet, dass dem Sender (4) eine Sendeoptik (7) nachgeordnet ist und dem Emp­ fänger (6) eine Empfangsoptik (9) vorgeordnet ist, wobei die Zirkularpo­ larisatoren an die Frontseiten der Sende- (7) und Empfangsoptik (9) an­ schließen.4. Light sensor according to one of claims 1-3, characterized in that the transmitter ( 4 ) is a transmission optics ( 7 ) and the Emp receiver ( 6 ) a reception optics ( 9 ) is arranged upstream, the Zirkularpo larisatoren to the front of the Connect the transmit ( 7 ) and receive optics ( 9 ). 5. Lichttaster nach Anspruch 4, dadurch gekennzeichnet, dass die Frontsei­ ten der Sende- (7) und Empfangsoptik (9) in einer Ebene verlaufen, wo­ bei diesen die die Zirkularpolarisatoren bildende Polarisationsfolie (14) vorgeordnet ist. 5. Light sensor according to claim 4, characterized in that the frontsei th of the transmitting ( 7 ) and receiving optics ( 9 ) run in one plane, where the polarizing film forming the circular polarizers ( 14 ) is arranged upstream. 6. Lichttaster nach einem der Ansprüche 1-5, dadurch gekennzeichnet, dass der Sender (4) Sendelichtstrahlen (3) im roten, sichtbaren Wellen­ längenbereich emittiert.6. Light sensor according to one of claims 1-5, characterized in that the transmitter ( 4 ) emits light beams ( 3 ) in the red, visible wavelength range. 7. Lichttaster nach Anspruch 6, dadurch gekennzeichnet, dass die Zirkular­ polarisatoren Lichtstrahlen mit Wellenlängen λ < λ0 sperren, wobei die Grenzwellenlänge im Bereich 600 nm ≦ λ0 ≦ 650 nm liegt.7. Light sensor according to claim 6, characterized in that the circular polarizers block light beams with wavelengths λ <λ 0 , the limit wavelength being in the range 600 nm ≦ λ 0 ≦ 650 nm. 8. Lichttaster nach einem der Ansprüche 1-7, dadurch gekennzeichnet, dass im Strahlengang der Empfangslichtstrahlen (5) ein Sperrfilter (15) vorgesehen ist, welches Lichtstrahlen im Infrarotbereich sperrt.8. Light scanner according to one of claims 1-7, characterized in that a blocking filter ( 15 ) is provided in the beam path of the received light beams ( 5 ), which blocks light beams in the infrared range. 9. Lichttaster nach Anspruch 8, dadurch gekennzeichnet, dass das Sperrfilter (15) Lichtstrahlen im nahen Infrarotbereich sperrt.9. Light sensor according to claim 8, characterized in that the blocking filter ( 15 ) blocks light rays in the near infrared range. 10. Lichttaster nach einem der Ansprüche 8 oder 9, dadurch gekennzeichnet, dass sich die Zirkularpolarisatoren und das Sperrfilter (15) zu einem opti­ schen Bandpassfilter ergänzen.10. Light sensor according to one of claims 8 or 9, characterized in that the circular polarizers and the blocking filter ( 15 ) complement one another to form an optical bandpass filter. 11. Lichttaster nach einem der Ansprüche 8-10, dadurch gekennzeichnet, dass das Sperrfilter (1 S) zwischen dem Empfänger (6) und der Emp­ fangsoptik (9) angeordnet ist.11. Light sensor according to one of claims 8-10, characterized in that the blocking filter (1 S) between the receiver ( 6 ) and the receiving optics ( 9 ) is arranged. 12. Lichttaster nach einem der Ansprüche 1-11, dadurch gekennzeichnet, dass der ortsauflösende Empfänger (6) von einer CCD-Zeile oder einer CMOS-Zeile gebildet ist.12. Light sensor according to one of claims 1-11, characterized in that the spatially resolving receiver ( 6 ) is formed by a CCD line or a CMOS line. 13. Lichttaster nach einem der Ansprüche 1-12, dadurch gekennzeichnet, dass der ortsauflösende Empfänger (6) von zwei Photodioden (6a, b) ge­ bildet ist. 13. Light sensor according to one of claims 1-12, characterized in that the spatially resolving receiver ( 6 ) is formed by two photodiodes ( 6 a, b). 14. Lichttaster nach Anspruch 13, dadurch gekennzeichnet, dass die Photodi­ oden (6a, b) des Empfängers (6) eine Baueinheit bilden.14. Light sensor according to claim 13, characterized in that the photodiodes ( 6 a, b) of the receiver ( 6 ) form a structural unit. 15. Lichttaster nach einem der Ansprüche 1-14, dadurch gekennzeichnet, dass die Ausgangssignale des ortsauflösenden Empfängers (6) in einer Auswerteeinheit zur Generierung eines Objektfeststellungssignals aus­ gewertet werden.15. Light sensor according to one of claims 1-14, characterized in that the output signals of the spatially resolving receiver ( 6 ) are evaluated in an evaluation unit for generating an object detection signal. 16. Lichttaster nach Anspruch 15, dadurch gekennzeichnet, dass in der Aus­ werteeinheit wenigstens eine Tastweite vorgebbar ist, welche den vom Empfänger (6) erfassten Distanzbereich in einen Nahbereich und einen Fernbereich unterteilt.16. Light sensor according to claim 15, characterized in that in the evaluation unit at least one scanning distance can be predetermined, which divides the distance range detected by the receiver ( 6 ) into a near range and a far range. 17. Lichttaster nach Anspruch 16, dadurch gekennzeichnet, dass in der Aus­ werteeinheit ein binäres Objektfeststellungssignal generiert wird, dessen Schaltzustände angeben, ob sich ein detektiertes Objekt im Nahbereich oder im Fernbereich befindet.17. Light sensor according to claim 16, characterized in that in the off value unit, a binary object detection signal is generated, the Switching states indicate whether there is a detected object in the close range or located in the far range.
DE20215464U 2002-10-08 2002-10-08 Optical sensor for detecting objects has circular polarizers arranged in front of light beam emitter and receiver Expired - Lifetime DE20215464U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE20215464U DE20215464U1 (en) 2002-10-08 2002-10-08 Optical sensor for detecting objects has circular polarizers arranged in front of light beam emitter and receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE20215464U DE20215464U1 (en) 2002-10-08 2002-10-08 Optical sensor for detecting objects has circular polarizers arranged in front of light beam emitter and receiver

Publications (1)

Publication Number Publication Date
DE20215464U1 true DE20215464U1 (en) 2003-01-16

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005026611B3 (en) * 2005-06-09 2006-09-07 Leuze Electronic Gmbh & Co Kg Sensor for detecting objects in an observation range having a spaced filled with a low pressure resin
DE102011008328A1 (en) * 2011-01-11 2012-07-12 Baumer Electric Ag Optical sensor, useful for detection of objects in a monitoring region of food processing in the food production, comprises a light sensor, which is encapsulated with a viewing pane for monitoring region

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005026611B3 (en) * 2005-06-09 2006-09-07 Leuze Electronic Gmbh & Co Kg Sensor for detecting objects in an observation range having a spaced filled with a low pressure resin
EP1731926A2 (en) * 2005-06-09 2006-12-13 Leuze electronic GmbH + Co. KG Sensor for recording objects in a surveillance range
EP1731926A3 (en) * 2005-06-09 2013-04-17 Leuze electronic GmbH + Co. KG Sensor for recording objects in a surveillance range
DE102011008328A1 (en) * 2011-01-11 2012-07-12 Baumer Electric Ag Optical sensor, useful for detection of objects in a monitoring region of food processing in the food production, comprises a light sensor, which is encapsulated with a viewing pane for monitoring region
DE102011008328B4 (en) 2011-01-11 2022-03-17 Baumer Electric Ag Optical sensor with colored front screen

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Legal Events

Date Code Title Description
R207 Utility model specification

Effective date: 20030220

R150 Term of protection extended to 6 years

Effective date: 20051130

R157 Lapse of ip right after 6 years

Effective date: 20090501