EP1342048A1 - Systeme de detection - Google Patents

Systeme de detection

Info

Publication number
EP1342048A1
EP1342048A1 EP01960157A EP01960157A EP1342048A1 EP 1342048 A1 EP1342048 A1 EP 1342048A1 EP 01960157 A EP01960157 A EP 01960157A EP 01960157 A EP01960157 A EP 01960157A EP 1342048 A1 EP1342048 A1 EP 1342048A1
Authority
EP
European Patent Office
Prior art keywords
sensor
arrangement according
sensor arrangement
layer
housing
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.)
Ceased
Application number
EP01960157A
Other languages
German (de)
English (en)
Inventor
Franz Hrubes
Norbert Reindl
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.)
Micro Epsilon Messtechnik GmbH and Co KG
Original Assignee
Micro Epsilon Messtechnik 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 Micro Epsilon Messtechnik GmbH and Co KG filed Critical Micro Epsilon Messtechnik GmbH and Co KG
Publication of EP1342048A1 publication Critical patent/EP1342048A1/fr
Ceased 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
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • G01B7/08—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means
    • G01B7/085—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means for measuring thickness of coating
    • 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
    • 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
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • G01B7/08—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means

Definitions

  • the invention relates to a sensor arrangement with a first sensor, which preferably has a measuring coil which operates in particular according to the eddy current principle, and with a second sensor, the two sensors being arranged in one housing.
  • Sensor arrangements of this type have long been known in practice.
  • This sensor arrangement has a combination of an eddy current sensor and a displacement sensor.
  • the eddy current sensor and the displacement measuring sensor are arranged in one axis, the displacement measuring sensor being arranged inside the measuring coil of the eddy current sensor and parallel to the coil axis.
  • the sensor arrangement described in DE 43 27 712 C2 is particularly problematic in that the nesting of the sensors causes the sensors to influence one another. This mutual influence affects the measurement with errors which, in contrast to errors which are caused, for example, by temperature changes during the measurement, can only be compensated for with difficulty.
  • the present invention is therefore based on the object of specifying a sensor arrangement of the type mentioned at the outset in which influencing of the sensors among one another is reduced.
  • the above object is achieved by the sensor arrangement with the features of patent claim 1.
  • the sensor arrangement in question is then designed and developed in such a way that a layer is formed on the measurement side of the housing, which is an active component of the second sensor.
  • a layer formed on the measurement side of the housing is an active component of the second sensor.
  • the active component could have at least one active measuring surface.
  • the active component could also comprise several active measurement areas. This would be particularly advantageous if the sensor arrangement has additional sensors in addition to the first and second sensors. The measuring surfaces of the individual sensors could then be individually matched to one another.
  • the layer could be designed to be electrically semiconducting to conductive, so that the selection of materials from which the layer can be produced is particularly large.
  • the material of the layer could then be matched particularly well to the respective application, without having to restrict the selection to materials with certain electrical properties.
  • the electrical resistance of the layer could be known in a particularly advantageous manner.
  • the layer could, for example, have a low-resistance electrical resistance, for example 100 ⁇ or more. With this relatively low-resistance electrical resistance of the layer, the eddy current effect in the layer is already reduced to such an extent that the measuring coil of a sensor, for example an eddy current sensor, is hardly influenced by the layer, that is to say "sees through” it.
  • the layer could also have a high-resistance electrical resistance. With a high electrical resistance of the layer, no influence by eddy currents would be detectable at all.
  • the layer could essentially be made of a graphite-containing material.
  • This graphite-containing material could be a resistive paste that could be printed and dried or baked.
  • the layer could also have particularly good electrical conductivity.
  • the layer could be designed such that, despite the good electrical conductivity, no eddy currents can be induced in the layer. This could be achieved, for example, by transverse to the flow direction of the eddy currents, i.e. radially to the axis of the measuring coil of the sensor, slots are made in the layer. A spread of eddy currents in the layer could thus be effectively avoided.
  • An electrically highly conductive layer could, however, also be designed in such a way that eddy currents can be caused in the layer.
  • the intensity of the eddy currents flowing in the layer could then be known in a particularly advantageous manner.
  • the intensity of the eddy currents could then be regarded as defined, also for further measurements, the electric field being weakened according to the formula for the depth of penetration - skin effect - or shielding effect. If the sensor signal is processed further, the eddy currents could then be taken into account and compensated for during the measurement.
  • Depth of penetration [mm] 0.503 • An electrically conductive target in position x could then also be detected by the weakened field. Instead of electricity
  • a and b represent the two respective penetration depths.
  • the prerequisite for detection of the target would be that the thickness of the layer would be significantly smaller than the theoretical penetration depth of the eddy currents.
  • a target could be detectable by means of the first sensor and / or the second sensor. This detection would thus also be possible if the sensor arrangement is covered with a layer of any material.
  • the distance to a target could also be detectable by means of the first sensor and / or the second sensor.
  • the distance to the target it would be possible, for example, to largely compensate for errors that arise from the change in the distance during the measurement.
  • variable media could be measured in the gap.
  • the measuring coil of the first sensor could be arranged in front of or behind, but also around the layer or the active measuring surface.
  • the first sensor could be designed as an eddy current sensor or an inductive sensor in a particularly advantageous manner.
  • the first sensor could also be designed as an ultrasonic sensor.
  • the second sensor could be a capacitive sensor. This would be of particular advantage if the distance to a target were detected by means of the first sensor, since in this case the volume or the layer thickness of a known dielectric arranged between the housing and the target could be determined with the capacitive sensor.
  • At least one further layer could be formed on the measuring side of the housing.
  • the layers could be arranged one above the other. This would make it possible in a particularly advantageous manner to connect several types of sensors without the sensors influencing one another.
  • the sensors could, for example, also be fully functional independently of one another or it would be e.g. possible that the capacitive coupling between several areas can be detected via a target.
  • the layer could be covered with a protective layer.
  • This protective layer would be designed in such a way that it does not influence measurement of the sensor arrangement. This would be particularly advantageous if the sensor arrangement and / or the target were in motion and the sensor arrangement would also have to be suitable for contact with the target.
  • the two sensors could be operated independently of one another.
  • at least one of the two sensors could be operated independently of several other additional sensors.
  • FIG. 2 shows a schematic illustration of a further exemplary embodiment of a sensor arrangement according to the invention with a dielectric and arranged between the sensor arrangement and the target
  • Fig. 3 shows the ideal current distribution in a target.
  • FIG. 1 shows a sensor arrangement which comprises a first sensor 1 with a measuring coil 2 operating according to the eddy current principle and a second sensor 3.
  • the first sensor 1 and the second sensor 3 are arranged in a housing 4, the housing 4 being at a distance 5 from a target 6.
  • a layer 7 is formed on the measuring side of the housing 4, which is an active component of the second sensor 3.
  • the active component of sensor 3 is an active measuring surface.
  • Layer 7 has a low-resistance electrical resistance which is approximately 100 ⁇ . The eddy current effect in layer 7 is therefore reduced to such an extent that the sensor is hardly influenced by layer 7, so to speak “sees through” it.
  • the first sensor 1 is designed as an eddy current sensor, the measuring coil 2 of which is arranged behind the layer 7.
  • the second sensor 3 is designed as a capacitive sensor, the layer 7 being the active measuring surface of the capacitive second sensor 3.
  • the sensor arrangement also has a first sensor 1 with a measuring coil 2 operating according to the eddy current principle, and a second sensor 3.
  • the first sensor 1 and the second sensor 3 are arranged in a housing 4, the housing 4 being at a distance 5 from a target 6.
  • the active component has an active measuring surface around which the measuring coil 2 is arranged.
  • the first sensor 1 is in turn designed as an eddy current sensor and the second sensor 3 as a capacitive sensor.
  • a dielectric 8 arranged between the housing 4 and the target 6 can be detected by means of the second sensor 3.
  • layer 7 has good electrical conductivity, so that eddy currents are caused in layer 7.
  • these eddy currents can be regarded as defined in further measurements.
  • the electric field is weakened according to the formula for the depth of penetration.
  • the weakening is shown in FIG. 3 by position a. Due to the eddy currents induced in the layer, the current distribution l 0 e ⁇ ax no longer applies at a defined point x but the weakened current I., e ⁇ ° x .

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

L'invention concerne un système de détection comprenant un premier détecteur (1) qui présente de préférence une bobine de mesure (2) fonctionnant notamment selon le principe du courant de Foucault, ainsi qu'un second détecteur (3). Les deux détecteurs (1, 3) sont montés dans un boîtier (4). Afin de réduire l'influence mutuelle des détecteurs, ledit système de détection est conçu et perfectionné de manière à former une couche (7) sur la face de mesure du boîtier (4), ladite couche étant un composant actif du second détecteur (3).
EP01960157A 2000-10-09 2001-08-08 Systeme de detection Ceased EP1342048A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10050193A DE10050193A1 (de) 2000-10-09 2000-10-09 Sensoranordnung
DE10050193 2000-10-09
PCT/DE2001/003031 WO2002031433A1 (fr) 2000-10-09 2001-08-08 Systeme de detection

Publications (1)

Publication Number Publication Date
EP1342048A1 true EP1342048A1 (fr) 2003-09-10

Family

ID=7659301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01960157A Ceased EP1342048A1 (fr) 2000-10-09 2001-08-08 Systeme de detection

Country Status (5)

Country Link
US (1) US6822442B2 (fr)
EP (1) EP1342048A1 (fr)
JP (1) JP4059766B2 (fr)
DE (1) DE10050193A1 (fr)
WO (1) WO2002031433A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004007314A1 (de) * 2004-02-14 2005-08-25 Robert Bosch Gmbh Verfahren und Messgerät zur Ortung von in einem Medium eingeschlossenen Objekten
DE102005039152A1 (de) * 2005-08-17 2007-02-22 Robert Bosch Gmbh Mechanische Trägereinrichtung sowie Messgerät mit einer mechanischen Trägereinrichtung
JP5106704B2 (ja) * 2009-03-17 2012-12-26 エービービー エービー 金属製の物体に設けられた金属層の厚さを測定するための方法および装置
JP5403524B2 (ja) * 2010-12-08 2014-01-29 レーザーテック株式会社 電池用電極材の厚さ測定装置、及び厚さ測定方法
US20140002069A1 (en) * 2012-06-27 2014-01-02 Kenneth Stoddard Eddy current probe
CA3009857C (fr) 2015-12-28 2023-12-12 Eaton Intelligent Power Limited Capteur d'articulation a courants de foucault
CN107014896B (zh) * 2017-03-28 2020-04-03 中国人民解放军国防科学技术大学 一种集成式电磁电容平面阵列传感器及其制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077858A (en) * 1960-03-17 1963-02-19 Gen Electric Canada Apparatus for controlling and measuring the thickness of thin electrically conductive films
DE19757575C1 (de) * 1997-12-23 1999-07-15 Siemens Ag Elektromagnetische Untersuchungseinrichtung, geeignet für Materialuntersuchung, mit Wirbelstrommeßkopf sowie Verfahren zum Betrieb derselben

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
FR1318027A (fr) * 1962-01-29 1963-02-15 Wayne Kerr Lab Ltd Appareil pour mesurer l'épaisseur d'une couche d'un matériau, par exemple une pellicule ou une feuille
US4168464A (en) * 1978-05-04 1979-09-18 General Dynamics Corporation Set point sensing system for numerically controlled machine tools
DE2829851A1 (de) * 1978-07-07 1980-01-24 Precitec Gmbh Anordnung zur messung des abstands zwischen einem metallischen werkstueck und einem bearbeitungswerkzeug
DE3134342A1 (de) * 1981-08-31 1983-03-10 Ingenieure Block + Seichter, 3000 Hannover Elektronischer kapazitiver messkopf fuer distanzmessungen
US4686454A (en) * 1984-08-22 1987-08-11 Pasar, Inc. Conductor tracer with improved open circuit detection, close-range discrimination and directionality
GB8607747D0 (en) * 1986-03-27 1986-04-30 Duracell Int Device
JPH071313B2 (ja) * 1986-12-23 1995-01-11 松下電工株式会社 壁の背後部材検知装置
DE3910297A1 (de) * 1989-03-30 1990-10-04 Micro Epsilon Messtechnik Beruehrungslos arbeitendes wegmesssystem
ATE160864T1 (de) * 1992-02-10 1997-12-15 Syel Di Franchi A Martolini A Elektronische kapazitive sensorstangeneinrichtung
US5337353A (en) * 1992-04-01 1994-08-09 At&T Bell Laboratories Capacitive proximity sensors
US5717332A (en) * 1993-05-03 1998-02-10 General Electric Company System and method using eddy currents to acquire positional data relating to fibers in a composite
FR2705145B1 (fr) * 1993-05-10 1995-08-04 Exa Ingenierie Dispositif de mesure de rectitude.
DE4327712C2 (de) 1993-08-18 1997-07-10 Micro Epsilon Messtechnik Sensoranordnung und Verfahren zum Erfassen von Eigenschaften der Oberflächenschicht eines metallischen Targets
DE19511939C2 (de) * 1995-03-31 2000-05-18 Micro Epsilon Messtechnik Sensor zur berührungslosen Dickenmessung an Folien
AT408580B (de) * 1997-11-21 2002-01-25 Bierbaumer Hans Peter Dr Messvorrichtung zumindest zur ermittlung der dicke einer bahn sowie verfahren hierfür

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077858A (en) * 1960-03-17 1963-02-19 Gen Electric Canada Apparatus for controlling and measuring the thickness of thin electrically conductive films
DE19757575C1 (de) * 1997-12-23 1999-07-15 Siemens Ag Elektromagnetische Untersuchungseinrichtung, geeignet für Materialuntersuchung, mit Wirbelstrommeßkopf sowie Verfahren zum Betrieb derselben

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO0231433A1 *

Also Published As

Publication number Publication date
DE10050193A1 (de) 2002-04-18
WO2002031433A1 (fr) 2002-04-18
US6822442B2 (en) 2004-11-23
JP2004510997A (ja) 2004-04-08
US20030169036A1 (en) 2003-09-11
WO2002031433A8 (fr) 2002-07-25
JP4059766B2 (ja) 2008-03-12

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