GB2012431A - Electromagnetic Position Transducer Uses Eddy Currents Induced in Conductive Member - Google Patents

Electromagnetic Position Transducer Uses Eddy Currents Induced in Conductive Member

Info

Publication number
GB2012431A
GB2012431A GB7830972A GB7830972A GB2012431A GB 2012431 A GB2012431 A GB 2012431A GB 7830972 A GB7830972 A GB 7830972A GB 7830972 A GB7830972 A GB 7830972A GB 2012431 A GB2012431 A GB 2012431A
Authority
GB
United Kingdom
Prior art keywords
conductive
eddy currents
currents induced
transducer
electromagnetic
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Withdrawn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
GB7830972A
Original Assignee
Hayter J E
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
Priority to AUPD125577 priority Critical
Application filed by Hayter J E filed Critical Hayter J E
Publication of GB2012431A publication Critical patent/GB2012431A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING 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
    • G01D5/00Mechanical 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
    • G01D5/12Mechanical 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 using electric or magnetic means
    • G01D5/14Mechanical 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 using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20Mechanical 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 using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/22Mechanical 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 using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
    • G01D5/225Mechanical 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 using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the mutual induction between the two coils
    • G01D5/2275Mechanical 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 using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the mutual induction between the two coils by a movable non-ferromagnetic conductive element
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
    • G01F23/22Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm by measurement of 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
    • G01F23/26Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm by measurement of 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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
    • G01F23/30Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm by floats
    • G01F23/64Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm by floats of the free float type without mechanical transmission elements
    • G01F23/72Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00Measuring force or stress, in general
    • G01L1/14Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators

Abstract

In an electromagnetic transducer the position of a conductive body in a time-varying magnetic field is sensed by detecting the reduction of the sum of e.m.f.s induced in a pair of series- opposed pick-up windings due to the magnetic field produced by eddy currents induced in the conductive body. In a first embodiment, measuring liquid level, the body is a metal tube 14 on a float 5 sliding along an elongate core 6 supporting an energising coil 7 and the secondaries 9, 10. Alternatively the three coils are wound on respective parallel rectangular ferromagnetic blocks and the conductive body is moveable between the energising coil and one of the series-opposed secondaries. <IMAGE>
GB7830972A 1977-08-17 1978-07-25 Electromagnetic Position Transducer Uses Eddy Currents Induced in Conductive Member Withdrawn GB2012431A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AUPD125577 1977-08-17

Publications (1)

Publication Number Publication Date
GB2012431A true GB2012431A (en) 1979-07-25

Family

ID=3767129

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7830972A Withdrawn GB2012431A (en) 1977-08-17 1978-07-25 Electromagnetic Position Transducer Uses Eddy Currents Induced in Conductive Member

Country Status (2)

Country Link
JP (1) JPS5443765A (en)
GB (1) GB2012431A (en)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0182085A2 (en) * 1984-10-19 1986-05-28 Kollmorgen Corporation Position and speed sensors
US4697144A (en) * 1984-04-19 1987-09-29 Verify Electronics Limited Position sensing apparatus
FR2609554A1 (en) * 1987-01-14 1988-07-15 Alsthom Device for measuring the internal angle of an electrical machine
FR2618548A1 (en) * 1987-07-24 1989-01-27 Alsthom Device for detecting the position of an object subjected to a linear displacement
EP0342098A1 (en) * 1988-05-10 1989-11-15 Automobiles Peugeot Level gauge
GB2219664A (en) * 1988-06-09 1989-12-13 Technical Software Consultants Position transducer
US4887465A (en) * 1986-05-16 1989-12-19 Kollmorgen Corporation Transducers for hostile environments
FR2753518A1 (en) * 1996-09-19 1998-03-20 Gall Paul Le Device for monitoring the filling level in pressurized liquid storage enclosures
US5815091A (en) * 1994-05-14 1998-09-29 Scientific Generics Limited Position encoder
WO1999007281A1 (en) * 1996-10-01 1999-02-18 Reining International Ltd. Conductance measuring apparatus
US6249234B1 (en) 1994-05-14 2001-06-19 Absolute Sensors Limited Position detector
US6304014B1 (en) 1997-10-02 2001-10-16 Synaptics (Uk) Limited Motor control system
US6471106B1 (en) 2001-11-15 2002-10-29 Intellectual Property Llc Apparatus and method for restricting the discharge of fasteners from a tool
US6522128B1 (en) 1997-10-15 2003-02-18 Synaptics (Uk) Limited Position sensor having compact arrangement of coils
US6534970B1 (en) 1998-05-22 2003-03-18 Synaptics (Uk) Limited Rotary position sensor and transducer for use therein
US6705511B1 (en) 1997-05-28 2004-03-16 Synaptics (Uk) Limited Transducer and method of manufacture
US6788221B1 (en) 1996-06-28 2004-09-07 Synaptics (Uk) Limited Signal processing apparatus and method
WO2008046209A1 (en) * 2006-10-17 2008-04-24 Athena Industrial Technologies Inc. Inspection apparatus and method
US7812268B2 (en) 2003-08-26 2010-10-12 Synaptics (Uk) Limited Digitizer system
EP2259031A1 (en) * 1999-07-12 2010-12-08 Hammertech AS Method of measuring multiphase flow
US7907130B2 (en) 2002-06-05 2011-03-15 Synaptics (Uk) Limited Signal transfer method and apparatus
FR2950964A1 (en) * 2009-10-02 2011-04-08 Continental Automotive France LINEAR POSITION SENSOR
US8243033B2 (en) 2001-05-21 2012-08-14 Synaptics (Uk) Limited Position sensor
US8570028B2 (en) 2007-05-10 2013-10-29 Cambridge Integrated Circuits Limited Transducer for a position sensor
US9136737B2 (en) 2011-05-02 2015-09-15 Okuma Corporation Stator and resolver
US20150329347A1 (en) * 2014-05-19 2015-11-19 General Electric Company Systems and methods for receptacle auto fill using inductive sensing
CN105737934A (en) * 2016-02-22 2016-07-06 衡阳镭目科技有限责任公司 Sodium liquid level detection device
US9410791B2 (en) 2010-12-24 2016-08-09 Cambridge Integrated Circuits Limited Position sensing transducer
US9470505B2 (en) 2012-06-13 2016-10-18 Cambridge Integrated Circuits Limited Position sensing transducer
EP3605033A1 (en) * 2018-07-31 2020-02-05 Tetra Laval Holdings & Finance S.A. Sensor and method for detecting the level of a pourable product inside a tube of packaging material

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58142147U (en) * 1982-03-19 1983-09-24
JPS59105516A (en) * 1982-12-09 1984-06-18 Saburo Nakagoori Differential transformer
JPS63273001A (en) * 1987-04-30 1988-11-10 Makome Kenkyusho:Kk Displacement measuring instrument
JPH0574003B2 (en) * 1987-10-08 1993-10-15 Nippon Electric Co
JP2003104664A (en) * 2001-09-28 2003-04-09 Toshiba Elevator Co Ltd Elevator device

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4697144A (en) * 1984-04-19 1987-09-29 Verify Electronics Limited Position sensing apparatus
EP0182085A3 (en) * 1984-10-19 1988-07-27 Kollmorgen Technologies Corporation Position and speed sensors
EP0182085A2 (en) * 1984-10-19 1986-05-28 Kollmorgen Corporation Position and speed sensors
US4887465A (en) * 1986-05-16 1989-12-19 Kollmorgen Corporation Transducers for hostile environments
FR2609554A1 (en) * 1987-01-14 1988-07-15 Alsthom Device for measuring the internal angle of an electrical machine
FR2618548A1 (en) * 1987-07-24 1989-01-27 Alsthom Device for detecting the position of an object subjected to a linear displacement
EP0342098A1 (en) * 1988-05-10 1989-11-15 Automobiles Peugeot Level gauge
FR2631442A1 (en) * 1988-05-10 1989-11-17 Peugeot Level gauge
GB2219664A (en) * 1988-06-09 1989-12-13 Technical Software Consultants Position transducer
GB2219664B (en) * 1988-06-09 1992-11-18 Technical Software Consultants Position transducer
US6249234B1 (en) 1994-05-14 2001-06-19 Absolute Sensors Limited Position detector
US5815091A (en) * 1994-05-14 1998-09-29 Scientific Generics Limited Position encoder
US6489899B1 (en) 1994-05-14 2002-12-03 Synaptics (Uk) Limited Position detector
US6788221B1 (en) 1996-06-28 2004-09-07 Synaptics (Uk) Limited Signal processing apparatus and method
US6980134B2 (en) 1996-06-28 2005-12-27 Synaptics (Uk) Limited Signal processing apparatus and method
EP0831271A1 (en) * 1996-09-19 1998-03-25 Paul Le Gall Level control apparatus for storage enclosures for liquid under pressure
FR2753518A1 (en) * 1996-09-19 1998-03-20 Gall Paul Le Device for monitoring the filling level in pressurized liquid storage enclosures
WO1999007281A1 (en) * 1996-10-01 1999-02-18 Reining International Ltd. Conductance measuring apparatus
US6705511B1 (en) 1997-05-28 2004-03-16 Synaptics (Uk) Limited Transducer and method of manufacture
US6304014B1 (en) 1997-10-02 2001-10-16 Synaptics (Uk) Limited Motor control system
US6522128B1 (en) 1997-10-15 2003-02-18 Synaptics (Uk) Limited Position sensor having compact arrangement of coils
US6534970B1 (en) 1998-05-22 2003-03-18 Synaptics (Uk) Limited Rotary position sensor and transducer for use therein
EP2259031A1 (en) * 1999-07-12 2010-12-08 Hammertech AS Method of measuring multiphase flow
US8243033B2 (en) 2001-05-21 2012-08-14 Synaptics (Uk) Limited Position sensor
US6471106B1 (en) 2001-11-15 2002-10-29 Intellectual Property Llc Apparatus and method for restricting the discharge of fasteners from a tool
US7907130B2 (en) 2002-06-05 2011-03-15 Synaptics (Uk) Limited Signal transfer method and apparatus
US7812268B2 (en) 2003-08-26 2010-10-12 Synaptics (Uk) Limited Digitizer system
WO2008046209A1 (en) * 2006-10-17 2008-04-24 Athena Industrial Technologies Inc. Inspection apparatus and method
US8274279B2 (en) 2006-10-17 2012-09-25 Athena Industrial Technologies, Inc. Inspection apparatus and method
US8570028B2 (en) 2007-05-10 2013-10-29 Cambridge Integrated Circuits Limited Transducer for a position sensor
FR2950964A1 (en) * 2009-10-02 2011-04-08 Continental Automotive France LINEAR POSITION SENSOR
WO2011038893A3 (en) * 2009-10-02 2011-12-01 Continental Automotive France Linear position sensor
CN102648399A (en) * 2009-10-02 2012-08-22 法国欧陆汽车公司 Linear position sensor
CN102648399B (en) * 2009-10-02 2014-10-22 法国欧陆汽车公司 Linear position sensor
US9121728B2 (en) 2009-10-02 2015-09-01 Continental Automotive France Linear position sensor
US9410791B2 (en) 2010-12-24 2016-08-09 Cambridge Integrated Circuits Limited Position sensing transducer
US9136737B2 (en) 2011-05-02 2015-09-15 Okuma Corporation Stator and resolver
US9470505B2 (en) 2012-06-13 2016-10-18 Cambridge Integrated Circuits Limited Position sensing transducer
US20150329347A1 (en) * 2014-05-19 2015-11-19 General Electric Company Systems and methods for receptacle auto fill using inductive sensing
US9663343B2 (en) * 2014-05-19 2017-05-30 Haier Us Appliance Solutions, Inc. Systems and methods for receptacle auto fill using inductive sensing
CN105737934B (en) * 2016-02-22 2019-02-15 衡阳镭目科技有限责任公司 A kind of sodium liquid level detection device
CN105737934A (en) * 2016-02-22 2016-07-06 衡阳镭目科技有限责任公司 Sodium liquid level detection device
WO2020025479A1 (en) * 2018-07-31 2020-02-06 Tetra Laval Holdings & Finance S.A. Sensor and method for detecting the level of a pourable product inside a tube of packaging material
EP3605033A1 (en) * 2018-07-31 2020-02-05 Tetra Laval Holdings & Finance S.A. Sensor and method for detecting the level of a pourable product inside a tube of packaging material

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)