DE2643413A1 - Inductive data pick=up on eddy current principle - has HF AC coil placed in metal carrier sleeve end behind end plate - Google Patents

Inductive data pick=up on eddy current principle - has HF AC coil placed in metal carrier sleeve end behind end plate

Info

Publication number
DE2643413A1
DE2643413A1 DE19762643413 DE2643413A DE2643413A1 DE 2643413 A1 DE2643413 A1 DE 2643413A1 DE 19762643413 DE19762643413 DE 19762643413 DE 2643413 A DE2643413 A DE 2643413A DE 2643413 A1 DE2643413 A1 DE 2643413A1
Authority
DE
Germany
Prior art keywords
coil
end plate
eddy current
carrier sleeve
current principle
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Withdrawn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
DE19762643413
Other languages
German (de)
Inventor
Reinhard Ing Grad Hilgner
Wolfgang Ing Grad Utz
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 DE19762643413 priority Critical patent/DE2643413A1/en
Publication of DE2643413A1 publication Critical patent/DE2643413A1/en
Withdrawn legal-status Critical Current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
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9006—Details, e.g. in the structure or functioning of sensors

Abstract

The end plate is a thin metal diaphragm consisting of a material having small magnetic permeability and high ohmic resistance. The frequency of the alternating current feeding the coil is between 104 and 105 Hertz. The thickness of the diaphragm is between 0.1 and 0.001 mm. The coil can be fitted in a shell-type core open on one side, whose open side is immediately behind the metal diaphragm. The end plate is made of a material which is magnetically permeable, resistant to temperature and resistant to chemical effects.

Description

Induktiver Meßwertaufnehmer nach dem WirbelstromprinzipInductive transducer based on the eddy current principle

Zusatz zu Patent . ... ... (Patentanm. P 26 37 413.0) Das Hauptpatent bezieht sich auf einen induktiven Meßwertaufnehmer nach dem Wirbelstromprinzip mit einer mit hochfrequentem Wechselstrom gespeisten Spule, die im Kopfende einer metallischen Trägerhülse unmittelbar hinter einer deren Stirnseite senkrecht zur Meßrichtung druckdicht abschließenden Abschlußplatte aus magnetisch durchlässigen, temperaturfesten und gegen chemische Sinflüsse resistenten Werkstoff angeordnet ist.Addendum to patent. ... ... (Patent registration P 26 37 413.0) The main patent refers to an inductive transducer based on the eddy current principle a coil fed with high-frequency alternating current, which is in the head end of a metallic Carrier sleeve immediately behind one of the end faces perpendicular to the measuring direction Pressure-tight closing plate made of magnetically permeable, temperature-resistant and a material resistant to chemical influences is arranged.

In dem im Hauptpatent angegebenen Ausführungsformen besteht die Abschlußplatte aus Keramik oder Glas.In the embodiment specified in the main patent, there is the end plate made of ceramic or glass.

Es gibt jedoch Anwendungsfälle, wo die Einsatzbedingungen derart sind, daß die mechanische Festigkeit bzw. die chemische Resistenz von Glas und Keramik nicht mehr ausreichen und die Abschlußplatte aus einem Metall, vorzugsweise einem hochlegierten Stahl, sein sollte.However, there are applications where the conditions of use are such that the mechanical strength or the chemical resistance of glass and ceramics no longer sufficient and the end plate made of a metal, preferably one high alloy steel, should be.

Um mit einem derartigen Meßwertaufnehmer auch weiterhin nach dem Wirbelstromprinzip arbeiten zu können, wird vorgeschlagen, die Abschlußplatte als eine dünne Metallmembran aus einem Werkstoff mit kleiner magnetischer Permeabilität und hohem ohmschen Widerstand herzustellen und die Frequenz des die Spulen speisenden Wechselstroms zwischen i04 und 105 Hz zu legen.To continue with such a transducer according to the eddy current principle To be able to work, it is proposed that the end plate be a thin metal membrane made of a material with low magnetic permeability and high ohmic resistance and the frequency of the alternating current feeding the coils between i04 and 105 Hz.

Als Membranwerkstoff kommen vorzugsweise hochlegierte, sogenannte unmagnetische Stähle mit Chrom- und Siliziumanteilen in Frage, die eine gute Korrosionsbeständigkeit und hohen lin Widerstand haben. Es ist in solchen Fällen auch möglich, die äußere Fläche der als Abschlußplatte eingesetzten Metallmembran mit einem anderen Werkstoff zu beschichten, was weitere Anwendungsmöglichkeiten eröffnet.The membrane material is preferably high-alloy, so-called non-magnetic steels with chromium and silicon components in question, the Have good corrosion resistance and high lin resistance. It is in such In some cases, it is also possible to use the outer surface of the metal membrane used as the end plate to be coated with a different material, which further application possibilities opened.

Bei den Einsatzbedingungen entsprechender Wahl von Membranmaterial, Membrandicke und Speisefrequenz können derartige Meßwertaufnehmer nach dem Wirbelstromprinzip in einem weiten Bereich eingesetzt werden.Appropriate choice of membrane material for the conditions of use, Membrane thickness and feed frequency can be measured by such transducers according to the eddy current principle can be used in a wide range.

Zur Erläuterung der Erfindung ist in der Figur ein Ausführungsbeispiel dargestellt und im folgenden beschrieben.An exemplary embodiment is shown in the figure to explain the invention shown and described below.

Mit einem induktiven MeßwertauSnehmer 1 nach dem Wirbelstromprinzip soll die Schwingung eines Meßobjekts 2, beispielsweise einer drehenden Welle, gemessen werden.With an inductive transducer 1 based on the eddy current principle is intended to measure the vibration of a measurement object 2, for example a rotating shaft will.

Der Meßwertaufnehmer 1 weist zu diesem Zweck eine Spule 3 auf, die mit einem Wechselstrom mit einer Frequenz zwischen 104 und 105 Hz gespeist wird. Die Spule ist in einem einseitig offenen Schalen- oder Topfkern 4 aus Ferrit oder dergleichen angebracht, dieser wiederum ist auf einer Trägerplatte 5 befestigt, die in einer metallischen Trägerhülse 6 befestigt ist, derart, daß sich die offene Stirnseite des Topfkerns 4 unmittelbar hinter einer Metallmembran 7 befindet, die die dem Meßobjekt 2 zugewandte Stirnseite der Trägerhülse 6 druckdicht abschließt. Die Verbindung zwischen Metallmembran 7 und der Trägerhülse 6 geschieht vorzugsweise durch Schweißen oder Löten.The transducer 1 has for this purpose a coil 3 which is fed with an alternating current with a frequency between 104 and 105 Hz. The coil is in a shell or pot core 4 made of ferrite or open on one side the like attached, this in turn is attached to a carrier plate 5, which is fixed in a metallic support sleeve 6, such that the open Front side of the pot core 4 is located immediately behind a metal membrane 7, which the end face of the carrier sleeve 6 facing the test object 2 closes off in a pressure-tight manner. The connection between the metal membrane 7 and the carrier sleeve 6 is preferably made by welding or soldering.

Das von der Spule 3 ausgehende Hochfrequenzfeld kann die Metallmembran 7 aus einem Werkstoff niedriger Permeabilität nahezu ungehindert durchtreten, insbesondere, wenn die Dicke der Metallmembran 7 zwischen 0,1 und 0,001 mm gewählt wird. Der hohe elektrische Widerstand des Membranwerkstoffs verhindert in Verbindung mit einer entsprechend niedrigen Speisefrequenz die Ausbildung von die Messung merkbar beeinflussenden Wirbelströmen in der Metallmembran 7.The high-frequency field emanating from the coil 3 can be the metal membrane 7 made of a material of low permeability pass through almost unhindered, in particular, when the thickness of the metal membrane 7 is selected between 0.1 and 0.001 mm. The height electrical resistance of the membrane material prevents in connection with a correspondingly low feed frequency the formation of the measurement noticeably influencing Eddy currents in the metal membrane 7.

3 Patentansprüche 1 Figur L e e r s e i t e3 claims 1 figure L e r s e i t e

Claims (3)

Patentansprüche 1. Induktiver Meßwertaufnehmer nach dem Wirbelstromprinzip mit einer mit hochfrequentem Wechselstrom gespeisten Spule, die im Kopfende einer metallischen Trägerhülse unmittelbar hinter einer deren Stirnseite senkrecht zur Meßrichtung druckdicht abschließenden Abschlußplatte aus magnetisch durchlässigen, temperaturfesten und gegen chemische Einflüsse resistenten Werkstoff angeordnet ist, gemäß Patent . ... ...Claims 1. Inductive transducer based on the eddy current principle with a coil fed with high-frequency alternating current, which is in the head end of a metallic carrier sleeve immediately behind one of the end faces perpendicular to the Measuring direction pressure-tight closing plate made of magnetically permeable, temperature-resistant and chemical-resistant material arranged is, according to patent. ... ... (Patentanm. P 26 37 413.0), dadurch gekennzeichnet, daß die Abschlußplatte eine dünne Metallmembran (7) ist aus einem Werkstoff mit kleiner magnetischer Permeabilität und hohem ohmschen Widerstand und daß die Frequenz des die Spule (3) speisenden Wechselstroms zwischen 104 und 105 Hz liegt. (Patent application P 26 37 413.0), characterized in that the end plate a thin metal membrane (7) is made of a material with low magnetic permeability and high ohmic resistance and that the frequency of the coil (3) feeding AC current is between 104 and 105 Hz. 2. Induktiver Meßwertaufnehmer nach Anspruch 1, dadurch gekennzeichnet, daß die Dicke der Metallmembran (7) zwischen 0,1 und 0,001 mm liegt.2. Inductive transducer according to claim 1, characterized in that that the thickness of the metal membrane (7) is between 0.1 and 0.001 mm. 3. Induktiver Meßwertaufnehmer nach Anspruch 1, dadurch gekennzeichnet, daß die Spule (3) in einem einseitig offenen Schalenkern (4) angebracht ist, dessen offene Seite unmittelbar hinter der Metallmembran (7) liegt.3. Inductive transducer according to claim 1, characterized in that that the coil (3) is mounted in a shell core (4) open on one side, whose open side is immediately behind the metal membrane (7).
DE19762643413 1976-09-27 1976-09-27 Inductive data pick=up on eddy current principle - has HF AC coil placed in metal carrier sleeve end behind end plate Withdrawn DE2643413A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19762643413 DE2643413A1 (en) 1976-09-27 1976-09-27 Inductive data pick=up on eddy current principle - has HF AC coil placed in metal carrier sleeve end behind end plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762643413 DE2643413A1 (en) 1976-09-27 1976-09-27 Inductive data pick=up on eddy current principle - has HF AC coil placed in metal carrier sleeve end behind end plate

Publications (1)

Publication Number Publication Date
DE2643413A1 true DE2643413A1 (en) 1978-03-30

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ID=5988951

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19762643413 Withdrawn DE2643413A1 (en) 1976-09-27 1976-09-27 Inductive data pick=up on eddy current principle - has HF AC coil placed in metal carrier sleeve end behind end plate

Country Status (1)

Country Link
DE (1) DE2643413A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3014416A1 (en) * 1979-06-18 1981-01-08 Omron Tateisi Electronics Co Proximity switch with coil on core - has capacitor on core rear and forming resonance circuit with coil and oscillator coupled to resonance circuit
US4587486A (en) * 1981-12-08 1986-05-06 Werner Turck Gmbh & Co., Kg Switch for detecting a magnetic field
US4704578A (en) * 1984-04-20 1987-11-03 Jeumont-Schneider Corporation Thermal compensation method for a magnetic circuit having an oscillating circuit with an inductance coil

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3014416A1 (en) * 1979-06-18 1981-01-08 Omron Tateisi Electronics Co Proximity switch with coil on core - has capacitor on core rear and forming resonance circuit with coil and oscillator coupled to resonance circuit
US4587486A (en) * 1981-12-08 1986-05-06 Werner Turck Gmbh & Co., Kg Switch for detecting a magnetic field
US4704578A (en) * 1984-04-20 1987-11-03 Jeumont-Schneider Corporation Thermal compensation method for a magnetic circuit having an oscillating circuit with an inductance coil

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