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DE4004728A1 - EM wave conductor unit with internal reflective channel - having aperture to affect light beam travelling from LED to opto-electric receiver - Google Patents

EM wave conductor unit with internal reflective channel - having aperture to affect light beam travelling from LED to opto-electric receiver

Info

Publication number
DE4004728A1
DE4004728A1 DE19904004728 DE4004728A DE4004728A1 DE 4004728 A1 DE4004728 A1 DE 4004728A1 DE 19904004728 DE19904004728 DE 19904004728 DE 4004728 A DE4004728 A DE 4004728A DE 4004728 A1 DE4004728 A1 DE 4004728A1
Authority
DE
Germany
Prior art keywords
light
channel
light channel
opening
receiver
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Withdrawn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
DE19904004728
Other languages
German (de)
Inventor
Alfred Ing Scherz
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of DE4004728A1 publication Critical patent/DE4004728A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G01F23/292—Light, e.g. infrared or ultraviolet
    • G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
    • G01F23/2922—Light, e.g. infrared or ultraviolet for discrete levels with light-conducting sensing elements, e.g. prisms
    • 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
    • G01D5/268—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 using optical fibres
    • 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
    • G01D5/32—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 attenuation or whole or partial obturation of beams of light
    • G01D5/34—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 attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/347—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 attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
    • G01D5/34707—Scales; Discs, e.g. fixation, fabrication, compensation
    • G01D5/34715—Scale reading or illumination devices
    • G01D5/34723—Scale reading or illumination devices involving light-guides
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/486—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by photo-electric detectors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

A unit, modulating e.m. waves prior to being conducted to an opto-electric device for conversion into an electric signal, consists of a U-shaped tubular part (LK) whose internal surface is made reflective by vapour deposition. The tubular part is slotted at some point to receive a rotating disk having holes. The tubular conductor may also be integrated with a transparent vessel containing liquids or gases which due to their less than perfect transparency can be detected and identified. USE - Measuring rotational speeds, counting drops of liquids, classifying transparency of gaseous substances.

Description

Die Erfindung betrifft eine Vorrichtung zur Leitung von elektro­ magnetischen Wellen, mit einem innen reflektierenden Lichtkanal.The invention relates to a device for conducting electro magnetic waves, with an internally reflecting light channel.

Der Lichtkanal wird vorzugsweise durch ein nicht flexibles Ma­ terial gebildet. Eine ebenfalls mögliche, jedoch flexible Vor­ richtung, ist aus der DE-OS 26 38 406 bekannt.The light channel is preferably a non-flexible measure formed material. Another possible but flexible approach direction, is known from DE-OS 26 38 406.

Der Erfindung liegt die Aufgabe zugrunde, mit Hilfe eines Licht­ kanals Sensoren oder Detektoren aufzubauen.The invention has for its object with the aid of a light channel sensors or detectors.

Dies wird gemäß Patentanspruch 1 dadurch erreicht, daß an den Enden des Lichtkanals aufeinander abgestimmte Lichtsender und/oder Lichtempfänger angeordnet sind und daß der Lichtkanal eine Öffnung für ein die elektromagnetischen Wellen beeinflus­ sendes Mittel aufweist.This is achieved according to claim 1 in that the Coordinated light emitter ends of the light channel and / or light receivers are arranged and that the light channel an opening for one that influences the electromagnetic waves has transmitting means.

Als Lichtsender können Luminiszenzdioden, Glühlampen oder andere Lichtquellen verwendet werden. Der Lichtempfänger muß entspre­ chend dem Lichtwellenbereich des Lichtsenders ausgewählt werden. Durch eine entprechende Führung des Lichtkanals können sowohl Gabel- wie auch Reflexlichtschranken aufgebaut werden.Luminous diodes, incandescent lamps or others can be used as light transmitters Light sources are used. The light receiver must correspond be selected according to the light wave range of the light transmitter. Appropriate guidance of the light channel allows both Fork as well as reflex light barriers can be built.

Zur Übertragung von Informationen ist es vorteilhaft, daß eine in die Öffnung ragende Einrichtung zur zeitweisen Unterbrechung des Strahls der elektromagnetischen Wellen vorhanden ist. So kann ein Detektor zur Drehzahlmessung so ausgeführt sein, daß eine drehbare Lochscheibe in die Öffnung hineinragt.To transmit information, it is advantageous that a device protruding into the opening for temporary interruption of the beam of electromagnetic waves is present. So a detector for speed measurement can be designed so that a rotatable perforated disc protrudes into the opening.

Die unterschiedliche Lichtdurchlässigkeit von Stoffen kann da­ durch detektiert werden, daß die Öffnung für flüssige oder gas­ förmige Stoffe durchströmbar ist. The different translucency of fabrics can be there by detecting that the opening for liquid or gas shaped substances can be flowed through.  

Eine einfache Realisierungsmöglichkeit der Vorrichtung ist da­ durch gegeben, daß der Lichtkanal von einem reflektierenden Kunststoff umgeben ist. Um beliebiges Material verwenden zu können, ist eine für elektromagnetische Wellen reflektierende Innenbeschichtung des Lichtkanals durch Aufdampfen oder Auf­ bringen einer Folie Voraussetzung.A simple possibility of realizing the device is there given that the light channel from a reflective Plastic is surrounded. To use any material is one that is reflective of electromagnetic waves Inner coating of the light channel by vapor deposition or opening bring a foil requirement.

Zur differenzierten Auswertung von Meßergebnissen ist es vor­ teilhaft, daß der Lichtkanal im Bereich der Lichtsender und/oder Lichtempfänger in mehrere Kanäle aufgeteilt ist, und daß er vom Lichtsender oder Lichtempfänger aus in mehrere Kanäle aufgeteilt ist.It is available for the differentiated evaluation of measurement results geous that the light channel in the area of the light transmitter and / or Light receiver is divided into several channels, and that it from Light transmitter or light receiver divided into several channels is.

Die Erfindung wird anhand eines Ausführungsbeispieles mit Zeich­ nungen näher erläutert. Es zeigt:The invention is based on an embodiment with drawing nations explained in more detail. It shows:

Fig. 1 eine Aufsicht des Ausführungsbeispieles und Fig. 1 is a plan view of the embodiment and

Fig. 2 einen Querschnitt durch einen Lichtkanal. Fig. 2 shows a cross section through a light channel.

Fig. 1 zeigt eine Gabellichtschranke GL mit einer Leuchtdiode als Lichtsender LS und einer entsprechenden Fotodiode als Licht­ empfänger LE. Sie arbeiten im Bereich des Infrarotlichtes und sind mit einer Auswerteeinheit für das gemessene Signal verbun­ den. Das Licht wird vom Lichtsender LS über einen U-förmig ge­ bogenen Lichtkanal LK zum Lichtempfänger LE geleitet. Der Licht­ kanal LK kann beliebige Form und Führung aufweisen. Der Licht­ kanal LK weist innen eine reflektierende Oberfläche auf. Fig. 1 shows a fork light barrier GL with a light emitting diode as light transmitter LS and a corresponding photodiode as light receiver LE . They work in the area of infrared light and are connected to an evaluation unit for the measured signal. The light is sent from the light transmitter LS via a U-shaped light channel LK to the light receiver LE . The light channel LK can have any shape and guidance. The light channel LK has a reflective surface on the inside.

Durch eine Öffnung ragt eine Lochscheibe LO in den Lichtkanal LK. Sie ist mit einer Welle W verbunden, deren Drehzahl gemessen wird. Die Ausnehmungen der rotierenden Lochscheibe LO ergeben bei eingeschaltetem Lichtsender LS am Lichtempfänger LE ein der Drehzahl der Lochscheibe LO proportionales Lichtmuster. Dieses wird nach der Umwandlung in elektrische Signale ausgewertet. Der Lichtstrahl wird somit durch die Lochscheibe LO moduliert. A perforated disc LO projects through an opening into the light channel LK . It is connected to a shaft W , the speed of which is measured. The recesses of the rotating perforated disc LO result to the rotational speed of the perforated disc LO proportional pattern of light when the light emitter to the light receiver LS LE. This is evaluated after the conversion into electrical signals. The light beam is thus modulated by the perforated disc LO .

Die Fig. 2 zeigt den Querschnitt durch den Lichtkanal LK mit dem Lichtsender LS. Die Löcher der Lochscheibe LO befinden sich ersichtlich im Strahlengang der Gabellichtschranke GL. Fig. 2 shows the cross section of the light channel LK to the light emitter LS. The holes in the perforated disc LO can be seen in the beam path of the fork light barrier GL .

Der Lichtkanal LK kann auf zwei oder mehrere Lichtkanäle aufge­ teilt werden, sodaß mit einem Lichtsender in mehrere Kanäle ein­ gestrahlt wird. Dasselbe gilt auch für die Empfängerseite. Durch die Öffnung können auch flüssige oder gasförmige Stoffe in den Lichtkanal einströmen bzw. mit einem durchsichtigen Röhrchen durchgeleitet werden. Zufolge der unterschiedlichen Lichtdurch­ lässigkeit der Stoffe können sie detektiert werden, beispiels­ weise in einem Treibstofftank zur Füllstandsmessung. Der Licht­ strahl wird von den jeweiligen Stoffen unterschiedlich gedämpft.The light channel LK can be divided up into two or more light channels, so that one light beam is emitted into several channels. The same applies to the recipient side. Liquid or gaseous substances can also flow into the light channel through the opening or be passed through with a transparent tube. Due to the different translucency of the substances, they can be detected, for example in a fuel tank for level measurement. The light beam is damped differently by the respective fabrics.

Claims (8)

1. Vorrichtung zur Leitung von elektromagnetischen Wellen im Inneren eines innen reflektierenden, hohlen Lichtkanal (LK), wobei ein dielektromagnetischen Wellen beeinflussendes Mittel und aufeinander abgestimmte Lichtsender (LS) und/oder Licht­ empfänger (LE) vorhanden sind, dadurch gekenn­ zeichnet, daß der Lichtsender (LS) bwz. der Lichtem­ pfänger (LE) an den Enden des Lichtkanals (LK) angeordnet ist und daß der Lichtkanal (LK) eine Öffnung für das dielektroma­ gnetischen Wellen beeinflussende Mittel aufweist.1. Device for guiding electromagnetic waves inside an internally reflective, hollow light channel (LK) , a means influencing dielectric waves and coordinated light transmitters (LS) and / or light receivers (LE) being present, characterized in that Light transmitter (LS) or the Lichtem receiver (LE) at the ends of the light channel ( LK) is arranged and that the light channel (LK) has an opening for the dielectric-magnetic waves influencing means. 2. Vorrichtung nach Anspruch 1, dadurch gekenn­ zeichnet, daß eine in die Öffnung ragende Einrichtung zur zeitweisen Unterbrechung des Strahls der elektromagnetischen Wellen vorhanden ist.2. Device according to claim 1, characterized records that a device protruding into the opening to temporarily interrupt the electromagnetic beam Waves is present. 3. Vorrichtung nach Anspruch 2, dadurch gekenn­ zeichnet, daß eine drehbare Lochscheibe (LO) in die Öffnung hineinragt.3. Apparatus according to claim 2, characterized in that a rotatable perforated disc (LO) protrudes into the opening. 4. Vorrichtung nach Anspruch 1, dadurch gekenn­ zeichnet, daß die Öffnung eine für elektromagnetische Wellen durchlässige Vorrichtung zur Aufnahme flüssiger und gas­ förmiger Stoffe enthält.4. The device according to claim 1, characterized records that the opening is one for electromagnetic Wavy permeable device for holding liquid and gas contains shaped substances. 5. Vorrichtung nach einem der vorherigen Ansprüche, da­ durch gekennzeichnet, daß die Innenbe­ schichtung des Lichtkanals (LK) durch Aufdampfen oder mit einer Folie aufgebracht ist.5. Device according to one of the preceding claims, characterized in that the inner coating of the light channel (LK) is applied by vapor deposition or with a film. 6. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Lichtkanal (LK) von ei­ nem reflektierenden Kunststoff umgeben ist. 6. Device according to one of claims 1 to 4, characterized in that the light channel (LK) is surrounded by egg nem reflective plastic. 7. Vorrichtung nach einem der vorherigen Ansprüche, da­ durch gekennzeichnet, daß der Lichtkanal (LK) im Bereich der Lichtsender (LS) und/oder Lichtempfänger (LE) in mehrere Kanäle aufgeteilt ist.7. Device according to one of the preceding claims, characterized in that the light channel (LK) in the area of the light transmitter (LS) and / or light receiver (LE) is divided into several channels. 8. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Lichtkanal (LK) vom Lichtsender (LS) oder Lichtempfänger (LE) aus in mehrere Kanäle aufgeteilt ist.8. Device according to one of claims 1 to 6, characterized in that the light channel (LK) from the light transmitter (LS) or light receiver (LE) is divided into several channels.
DE19904004728 1989-02-28 1990-02-15 EM wave conductor unit with internal reflective channel - having aperture to affect light beam travelling from LED to opto-electric receiver Withdrawn DE4004728A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT43689A ATA43689A (en) 1989-02-28 1989-02-28 DEVICE FOR CONDUCTING ELECTROMAGNETIC SHAFTS

Publications (1)

Publication Number Publication Date
DE4004728A1 true DE4004728A1 (en) 1990-08-30

Family

ID=3490559

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19904004728 Withdrawn DE4004728A1 (en) 1989-02-28 1990-02-15 EM wave conductor unit with internal reflective channel - having aperture to affect light beam travelling from LED to opto-electric receiver

Country Status (3)

Country Link
AT (1) ATA43689A (en)
DE (1) DE4004728A1 (en)
FR (1) FR2643710A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4113720A1 (en) * 1991-04-26 1992-10-29 Daimler Benz Ag FORK LIGHT BARRIER
DE4437348A1 (en) * 1994-10-19 1996-04-25 Schleicher & Co Int Document shredder with light barrier activated mechanism
GB2390897A (en) * 2002-04-11 2004-01-21 Agilent Technologies Inc Optical encoder device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1219833A (en) * 1968-02-29 1971-01-20 Lumenition Ltd Improvements in ignition systems for internal combustion engines
DE2034344A1 (en) * 1970-07-10 1972-01-13 Ulrich H Device for measuring physical quantities by measuring the intensity of a bundle of light rays
DE3630396A1 (en) * 1986-09-06 1988-03-17 Bbc Brown Boveri & Cie ARRANGEMENT FOR LEVEL MEASUREMENT AND MONITORING OF A LIQUID IN A CONTAINER

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4113720A1 (en) * 1991-04-26 1992-10-29 Daimler Benz Ag FORK LIGHT BARRIER
DE4437348A1 (en) * 1994-10-19 1996-04-25 Schleicher & Co Int Document shredder with light barrier activated mechanism
DE4437348C2 (en) * 1994-10-19 2003-11-06 Schleicher & Co Int Ag Document shredder with a cutter and a light barrier
GB2390897A (en) * 2002-04-11 2004-01-21 Agilent Technologies Inc Optical encoder device
GB2390897B (en) * 2002-04-11 2005-08-10 Agilent Technologies Inc Optical encoder device
US6995356B2 (en) 2002-04-11 2006-02-07 Agilent Technologies, Inc. Optical encoder device

Also Published As

Publication number Publication date
FR2643710A1 (en) 1990-08-31
ATA43689A (en) 1991-05-15

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