WO1989003537A1 - Detecteur inductif de proximite - Google Patents

Detecteur inductif de proximite Download PDF

Info

Publication number
WO1989003537A1
WO1989003537A1 PCT/AT1988/000076 AT8800076W WO8903537A1 WO 1989003537 A1 WO1989003537 A1 WO 1989003537A1 AT 8800076 W AT8800076 W AT 8800076W WO 8903537 A1 WO8903537 A1 WO 8903537A1
Authority
WO
WIPO (PCT)
Prior art keywords
proximity detector
inductive proximity
bridge circuit
circuit
demodulator
Prior art date
Application number
PCT/AT1988/000076
Other languages
German (de)
English (en)
Inventor
Karl Ripka
Original Assignee
Elin-Union Aktiengesellschaft Für Elektrische Indu
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 Elin-Union Aktiengesellschaft Für Elektrische Indu filed Critical Elin-Union Aktiengesellschaft Für Elektrische Indu
Publication of WO1989003537A1 publication Critical patent/WO1989003537A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V15/00—Tags attached to, or associated with, an object, in order to enable detection of the object

Definitions

  • the invention relates to an inductive proximity detector with a higher-frequency magnetic alternating field influenced by an approaching object.
  • inductive proximity switches have been used in which an approaching, electrically conductive object triggers a pulse, which was then processed further.
  • the disadvantage here is that the proximity switches respond to all ferromagnetic or electrically conductive substances.
  • the object of the invention is to provide a proximity detector which reliably prevents false triggering as a result of being influenced by metal construction parts.
  • the passive resonance circuit owing to its simple construction, can be designed to be absolutely tread-resistant, impact-resistant and weatherproof at low cost.
  • the active part of the inductive proximity detector is constructed from a plurality of, in particular two, spatially separate, preferably fed by the same driver circuit, transmitter coils with open magnetic circuits, which are connected together with a voltage divider to form a bridge circuit is.
  • the inductive proximity detector is mounted on a trolley and is only activated when the trolley is moved via a sensor that detects the rotary movement of the wheels.
  • the inductive proximity detector is deactivated by means of a drop-delay timer only some time after the car has come to a standstill.
  • a further embodiment of the invention consists in that a sawtooth-shaped voltage generated in an LF oscillator frequency-modulates a driver signal generated in an HF oscillator, and that this driver signal is fed via the input terminals to a bridge circuit, the bridge circuit from two there are series-connected sensor coils, in which a voltage divider consisting of two ohmic resistors is arranged in parallel, and that the connecting lines between the sensor coils or between the ohmic resistors are connected to the input terminals of the bridge circuit, and that the connecting wires - Lines from the first transmitter coil with the first ohmic resistor, or from the second transmitter coil with the second ohmic resistor, are fed via the measuring terminals of the bridge circuit to the input of a signal amplifier whose output side is connected to the input side of a demodulator, and that a filter for the wobble frequency is connected downstream of the demodulator, and that the output side of the filter is connected to the input side of a demodulator, and that a threshold switch
  • This circuit arrangement has the advantage of a particularly high sensitivity, as a result of which long response distances can be achieved.
  • the resonance circuits are reliably recognized and clearly differentiated from other metal parts, for example sheet metal covers, and rail crossings. If the wagons leave the permitted working area, a warning signal is triggered.

Landscapes

  • 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)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

Un détecteur inductif de proximité (4) comprend un champ magnétique alternatif de haute fréquence influencé par l'approche d'un objet (3). A cet effet, un champ magnétique alternatif est généré par une tension alternative (2) à fréquence vobulée, et l'objet (3) dont l'approche est détectée est un champ passif de résonance avec un circuit magnétique ouvert. Cette mesure permet de démarquer clairement des zones de travail, de les identifier avec certitude et de les distinguer clairement de parties métalliques.
PCT/AT1988/000076 1987-10-06 1988-10-05 Detecteur inductif de proximite WO1989003537A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0254587A AT389603B (de) 1987-10-06 1987-10-06 Induktiver annaeherungsdetektor
ATA2545/87 1987-10-06

Publications (1)

Publication Number Publication Date
WO1989003537A1 true WO1989003537A1 (fr) 1989-04-20

Family

ID=3536184

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT1988/000076 WO1989003537A1 (fr) 1987-10-06 1988-10-05 Detecteur inductif de proximite

Country Status (3)

Country Link
AT (1) AT389603B (fr)
DD (1) DD274723A5 (fr)
WO (1) WO1989003537A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1626500A3 (fr) * 2004-08-13 2007-12-05 Airbus Deutschland GmbH Circuit pour la surveillance d'une porte
US7414530B2 (en) 2004-08-13 2008-08-19 Airbus Deutschland Gmbh Monitoring circuit for a door

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1473763A1 (de) * 1965-06-01 1970-05-21 Saba Gmbh Verfahren und Anordnung zur Ortung von Zielobjekten,insbesondere von verschuetteten Personen
DE2722498A1 (de) * 1977-05-18 1978-11-23 Voll Walter Einrichtung an einem kraftfahrzeug zur anzeige eines mindestabstands
FR2545221A1 (fr) * 1983-04-29 1984-11-02 Thomson Jeumont Cables Capteur de donnees, par courant de foucault, et ensemble de controle de resistivite muni d'un tel capteur
JPH0663486A (ja) * 1992-08-24 1994-03-08 Dainippon Printing Co Ltd ストライプ状コーティング方法及びそのためのコーティングヘッド

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1167229B (de) * 1960-12-28 1964-04-02 Siemens Ag Raumschutzanlage mit in eine Brueckenschaltung einbezogenen Messelektroden und periodischer UEberpruefung der Anlage
GB1567302A (en) * 1975-10-04 1980-05-14 Wickman Mach Tool Sales Ltd Machine guard installations
DE2551348A1 (de) * 1975-11-15 1977-05-18 Wilhelm Jank Vorrichtung zur erkennung von resonatormarken

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1473763A1 (de) * 1965-06-01 1970-05-21 Saba Gmbh Verfahren und Anordnung zur Ortung von Zielobjekten,insbesondere von verschuetteten Personen
DE2722498A1 (de) * 1977-05-18 1978-11-23 Voll Walter Einrichtung an einem kraftfahrzeug zur anzeige eines mindestabstands
FR2545221A1 (fr) * 1983-04-29 1984-11-02 Thomson Jeumont Cables Capteur de donnees, par courant de foucault, et ensemble de controle de resistivite muni d'un tel capteur
JPH0663486A (ja) * 1992-08-24 1994-03-08 Dainippon Printing Co Ltd ストライプ状コーティング方法及びそのためのコーティングヘッド

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Band 9, Nr. 199 (P-380)(1922), 16. August 1985; & JP-A-6063486 (NIHON AUTOMATION K.K.) 11. April 1985 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1626500A3 (fr) * 2004-08-13 2007-12-05 Airbus Deutschland GmbH Circuit pour la surveillance d'une porte
US7414530B2 (en) 2004-08-13 2008-08-19 Airbus Deutschland Gmbh Monitoring circuit for a door

Also Published As

Publication number Publication date
DD274723A5 (de) 1989-12-27
ATA254587A (de) 1989-05-15
AT389603B (de) 1990-01-10

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