DE19913872A1 - Sensor with failure monitoring system - Google Patents

Sensor with failure monitoring system

Info

Publication number
DE19913872A1
DE19913872A1 DE1999113872 DE19913872A DE19913872A1 DE 19913872 A1 DE19913872 A1 DE 19913872A1 DE 1999113872 DE1999113872 DE 1999113872 DE 19913872 A DE19913872 A DE 19913872A DE 19913872 A1 DE19913872 A1 DE 19913872A1
Authority
DE
Germany
Prior art keywords
sensor
sensor surface
monitoring system
optical receiver
failure monitoring
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
DE1999113872
Other languages
German (de)
Other versions
DE19913872C2 (en
Inventor
Manfred Schmitt
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
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Priority to DE1999113872 priority Critical patent/DE19913872C2/en
Publication of DE19913872A1 publication Critical patent/DE19913872A1/en
Application granted granted Critical
Publication of DE19913872C2 publication Critical patent/DE19913872C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V13/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils

Abstract

The sensor has a sensor surface (11) which is used to transmit or receive wireless signals. The sensor is transparent in the region of the sensor surface. An optical transmitter (6) and an optical receiver (7) are arranged in the sensor for monitoring the transparency in the region of the sensor surface. The sensor surface is a component of a transparent body (5) which may include edges (8) for light reflection. A monitoring circuit may be connected to the optical receiver for evaluating the signals it receives.

Description

Die Erfindung betrifft einen Sensor mit einem Ausfallüberwa­ chungssystem, wobei der Sensor eine Sensorfläche aufweist, die zum Aussenden und/oder Empfangen nicht leitungsgebundener Signale dient.The invention relates to a sensor with a failure monitor system, the sensor having a sensor surface, those for sending and / or receiving non-line-bound Serves signals.

Ein gattungsgemäßer Sensor ist aus der DE 44 14 748 C2 be­ kannt. Der Näherungssensor enthält ein innerhalb eines Gehäu­ ses auf einer Leiterplatte angeordnetes Sensorsystem. Vor dem Sensorsystem ist dem Beeinflussungsraum zugewandt ein elek­ trischer Leiter angebracht, z. B. ein Draht, dessen Impedanz von einer Auswerteschaltung überwacht wird, welche imstande ist, ein Warnsignal abzugeben. Es wird dabei davon ausgegan­ gen, daß bei Beschädigung des Sensors auch der Draht zerstört wird. Diese Art der Überwachung hat jedoch den Nachteil, daß jedes Metall von der Sensorfläche z. B. einen induktiven Sen­ sor vorbedämpft und seine Empfindlichkeit herabsetzt.A generic sensor is from DE 44 14 748 C2 knows. The proximity sensor contains one within a housing sensor system arranged on a printed circuit board. Before the The sensor system faces the influencing area an elec trischer head attached, for. B. a wire whose impedance is monitored by an evaluation circuit, which is capable is to give a warning signal. It is assumed that the wire is also destroyed if the sensor is damaged becomes. However, this type of monitoring has the disadvantage that any metal from the sensor surface z. B. an inductive Sen sor pre-attenuated and its sensitivity reduced.

Die Beschädigungsüberwachung von Sensoren ist außerordentlich wichtig, da Näherungsschalter in großen Stückzahlen in der Automatisierungstechnik eingesetzt werden. Eine hohe Funk­ tionssicherheit und Verfügbarkeit der Anlagen ist von hoher wirtschaftlicher Bedeutung. Aus Kostengründen werden oftmals Standardsensoren verwendet, die keine Funktionsüberwachung besitzen. Die Folge ist, daß eine mechanische Beschädigung der Sensoren erst durch eine Fehlfunktion der Anlage meist verbunden mit Anlagenstillstand festgestellt wird. Die Erfah­ rung hat gezeigt, daß die meisten Geräteausfälle auf mecha­ nische Beschädigungen der aktiven Sensorfläche und der dahin­ terliegenden Komponenten zurückzuführen sind.Damage monitoring of sensors is extraordinary important because proximity switches in large numbers in the Automation technology can be used. A high funk The reliability and availability of the systems is extremely high economic importance. Often, for cost reasons Standard sensors are used that do not have function monitoring have. The result is mechanical damage of the sensors mostly due to a malfunction of the system associated with plant downtime is determined. The experience tion has shown that most device failures are due to mecha Damage to the active sensor surface and the damage to it underlying components.

Daher liegt der Erfindung die Aufgabe zugrunde, einen Sensor mit einem Ausfallüberwachungssystem zu schaffen, das mecha- nische Beschädigung der Sensorfläche erkennt, ohne die Emp­ findlichkeit des Sensors zu beeinträchtigen.The invention is therefore based on the object of a sensor with a failure monitoring system that mecha-  Detects damage to the sensor surface without the Emp affect the sensitivity of the sensor.

Die Aufgabe wird dadurch gelöst, daß der Sensor im Bereich der Sensorfläche lichtdurchlässig ist, daß im Sensor ein op­ tischer Sender und ein optischer Empfänger angeordnet sind, die zur Überwachung der Lichtdurchlässigkeit im Bereich der Sensorfläche dienen.The object is achieved in that the sensor in the area the sensor surface is translucent that an op table transmitter and an optical receiver are arranged, for monitoring light transmission in the area of Serve sensor surface.

Vorteilhafte Ausgestaltungen der Erfindung sind den Unteran­ sprüchen 2 bis 4 zu entnehmen.Advantageous embodiments of the invention are the Unteran sayings 2 to 4.

Ein Ausführungsbeispiel der Erfindungen wird im folgenden an­ hand einer Zeichnung näher erläutert.An embodiment of the inventions is set out below hand explained in more detail a drawing.

Die Figur zeigt einen Sensor 1, hier einen induktiven Sensor, der einen magnetischen Schalenkern 2 mit einer Spule 3, eine Hülse 4, einen Sensortopf 5, einen optischen Sender 6 und ei­ nen optischen Empfänger 7 umfaßt. Der Sensortopf 5 ist als lichtdurchlässiger Körper mit endseitig angefasten Kanten 8 ausgebildet. Ein vom optischen Sender 6 ausgehender Licht­ strahl, dessen Verlauf hier durch die Strichpunktlinie 9 an­ gedeutet ist, wird an den angefasten Kanten 8 reflektiert und erreicht durch den Topfboden des Sensortopfes 5 hindurch den optischen Empfänger 7. Der Topfboden weist eine Sensorfläche 11 auf, die zum Aussenden und/oder Empfangen nicht leitungs­ gebundener Signale dient. Beim induktiven Sensor ist dies das elektromagnetische Feld.The figure shows a sensor 1 , here an inductive sensor, which comprises a magnetic shell core 2 with a coil 3 , a sleeve 4 , a sensor cup 5 , an optical transmitter 6 and an optical receiver 7 . The sensor pot 5 is designed as a translucent body with chamfered edges 8 at the end. A light beam emanating from the optical transmitter 6 , the course of which is indicated here by the broken line 9 , is reflected on the chamfered edges 8 and reaches the optical receiver 7 through the bottom of the sensor pot 5 . The bottom of the pot has a sensor surface 11 which is used to transmit and / or receive signals that are not line-bound. For the inductive sensor, this is the electromagnetic field.

Bei mechanischer Verformung des Topfbodens wird durch Trübung des Materials bzw. dessen Zerstörung der Lichtstrahl unter­ brochen. Dies wird von einer mit dem Empfänger 7 verbundenen Überwachungsschaltung 10 erfaßt und gegebenenfalls durch Alarm angezeigt.If the bottom of the pot is mechanically deformed, the light beam is interrupted by clouding the material or destroying it. This is detected by a monitoring circuit 10 connected to the receiver 7 and optionally indicated by an alarm.

Zur Fremdlichtunterdrückung ist es vorteilhaft, den Licht­ strahl z. B. durch Frequenzmodulation, Pulsmodulation usw. zu modulieren bzw. den Sender 6, den Empfänger 7 und/oder das Topfmaterial so auszuwählen, daß Licht nur in einem bestimm­ ten Spektralbereich bzw. einer bestimmten Wellenlänge ausge­ wertet wird.For suppression of extraneous light, it is advantageous to beam the light z. B. to modulate by frequency modulation, pulse modulation etc. or to select the transmitter 6 , the receiver 7 and / or the pot material so that light is evaluated only in a specific spectral range or a certain wavelength.

Claims (4)

1. Sensor (1) mit einem Ausfallüberwachungssystem, wobei der Sensor (1) eine Sensorfläche (11) aufweist, die zum Aussenden und/oder Empfangen nicht leitungsgebundener Signale dient, dadurch gekennzeichnet, daß der Sensor (1) im Bereich der Sensorfläche (11) lichtdurchlässig ist, daß im Sensor (1) ein optischer Sender (6) und ein optischer Empfänger (7) angeordnet sind, die zur Überwachung der Licht­ durchlässigkeit im Bereich der Sensorfläche (11) dienen.1. Sensor ( 1 ) with a failure monitoring system, the sensor ( 1 ) having a sensor surface ( 11 ) which is used for transmitting and / or receiving non-line-bound signals, characterized in that the sensor ( 1 ) in the region of the sensor surface ( 11 ) is translucent that an optical transmitter ( 6 ) and an optical receiver ( 7 ) are arranged in the sensor ( 1 ), which are used to monitor the light transmission in the area of the sensor surface ( 11 ). 2. Sensor nach Anspruch 1, dadurch gekennzeich­ net, daß die Sensorfläche (11) Bestandteil eines licht­ durchlässigen Körpers (5) ist.2. Sensor according to claim 1, characterized in that the sensor surface ( 11 ) is part of a translucent body ( 5 ). 3. Sensor nach Anspruch 1 oder 2, dadurch gekenn­ zeichnet, daß der lichtdurchlässige Körper (5) angefa­ ste Kanten (8) zur Lichtreflexion aufweist.3. Sensor according to claim 1 or 2, characterized in that the translucent body ( 5 ) chamfered edges ( 8 ) for light reflection. 4. Sensor nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß mit dem optischen Empfänger (7) eine Überwachungsschaltung (10) verbunden ist, die zur Auswertung vom Empfänger (7) aufgenommener Lichtsig­ nale dient.4. Sensor according to any one of the preceding claims, characterized in that a monitoring circuit ( 10 ) is connected to the optical receiver ( 7 ), which is used for evaluating signals received by the receiver ( 7 ).
DE1999113872 1999-03-26 1999-03-26 Failure monitoring system sensor Expired - Fee Related DE19913872C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1999113872 DE19913872C2 (en) 1999-03-26 1999-03-26 Failure monitoring system sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1999113872 DE19913872C2 (en) 1999-03-26 1999-03-26 Failure monitoring system sensor

Publications (2)

Publication Number Publication Date
DE19913872A1 true DE19913872A1 (en) 2000-10-19
DE19913872C2 DE19913872C2 (en) 2001-07-12

Family

ID=7902596

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1999113872 Expired - Fee Related DE19913872C2 (en) 1999-03-26 1999-03-26 Failure monitoring system sensor

Country Status (1)

Country Link
DE (1) DE19913872C2 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1396739A (en) * 1971-08-10 1975-06-04 Hermle E Proximity switch
DE4125444A1 (en) * 1991-07-31 1993-02-04 Kastl Electronic Gmbh & Co Kg Automatic welding positioning device - with analog=digital transformer connected to sensor measuring direct current from sensor
DE4242164A1 (en) * 1992-09-30 1994-06-16 Hiss Eckart Contactless safety sensor with PTC switch - has conductive tracks within housing which if broken due to mechanical damage of housing cause fault function to be signalled
DE4337518C1 (en) * 1993-11-03 1995-04-27 Ifm Electronic Gmbh Method for monitoring an electronic switching device
DE4414748A1 (en) * 1994-04-20 1995-10-26 Pepperl & Fuchs Proximity sensor for contactless inductive or capacitive switch
DE4438039A1 (en) * 1994-10-25 1996-05-02 Leon Helma Christina Self-testing personnel safety monitoring system with switch=off detection point

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1396739A (en) * 1971-08-10 1975-06-04 Hermle E Proximity switch
DE4125444A1 (en) * 1991-07-31 1993-02-04 Kastl Electronic Gmbh & Co Kg Automatic welding positioning device - with analog=digital transformer connected to sensor measuring direct current from sensor
DE4242164A1 (en) * 1992-09-30 1994-06-16 Hiss Eckart Contactless safety sensor with PTC switch - has conductive tracks within housing which if broken due to mechanical damage of housing cause fault function to be signalled
DE4337518C1 (en) * 1993-11-03 1995-04-27 Ifm Electronic Gmbh Method for monitoring an electronic switching device
DE4414748A1 (en) * 1994-04-20 1995-10-26 Pepperl & Fuchs Proximity sensor for contactless inductive or capacitive switch
DE4438039A1 (en) * 1994-10-25 1996-05-02 Leon Helma Christina Self-testing personnel safety monitoring system with switch=off detection point

Also Published As

Publication number Publication date
DE19913872C2 (en) 2001-07-12

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OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee