GB2012431A - Electromagnetic Position Transducer Uses Eddy Currents Induced in Conductive Member - Google Patents
Electromagnetic Position Transducer Uses Eddy Currents Induced in Conductive MemberInfo
- 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
- eddy currents
- currents induced
- conductive body
- conductive member
- position transducer
- 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- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING 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
- G01D5/00—Mechanical 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
- G01D5/12—Mechanical 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
- G01D5/14—Mechanical 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
- G01D5/20—Mechanical 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
- G01D5/22—Mechanical 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
- G01D5/225—Mechanical 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
- G01D5/2275—Mechanical 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring 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
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
- G01F23/72—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/14—Measuring 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Thermal Sciences (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
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>
Applications Claiming Priority (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 (31)
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 |
CN111397698A (en) * | 2020-01-03 | 2020-07-10 | 骆金山 | Current type water level display and controller |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58142147U (en) * | 1982-03-19 | 1983-09-24 | 札馬砕石工業株式会社 | Dump truck rear door opening/closing device |
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 |
JPH0196511A (en) * | 1987-10-08 | 1989-04-14 | Nec Corp | Displacement detecting element and displacement arithmetic element |
JP2003104664A (en) * | 2001-09-28 | 2003-04-09 | Toshiba Elevator Co Ltd | Elevator device |
-
1978
- 1978-07-25 GB GB7830972A patent/GB2012431A/en not_active Withdrawn
- 1978-08-17 JP JP9959578A patent/JPS5443765A/en active Pending
Cited By (45)
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 |
FR2631442A1 (en) * | 1988-05-10 | 1989-11-17 | Peugeot | LEVEL GAUGE |
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 |
GB2219664B (en) * | 1988-06-09 | 1992-11-18 | Technical Software Consultants | Position transducer |
US6489899B1 (en) | 1994-05-14 | 2002-12-03 | Synaptics (Uk) Limited | Position detector |
US5815091A (en) * | 1994-05-14 | 1998-09-29 | Scientific Generics Limited | Position encoder |
US6249234B1 (en) | 1994-05-14 | 2001-06-19 | Absolute Sensors Limited | Position detector |
US6980134B2 (en) | 1996-06-28 | 2005-12-27 | Synaptics (Uk) Limited | Signal processing apparatus and method |
US6788221B1 (en) | 1996-06-28 | 2004-09-07 | 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 |
CN102648399A (en) * | 2009-10-02 | 2012-08-22 | 法国欧陆汽车公司 | Linear position sensor |
FR2950964A1 (en) * | 2009-10-02 | 2011-04-08 | Continental Automotive France | 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 |
WO2011038893A3 (en) * | 2009-10-02 | 2011-12-01 | 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 |
US9663343B2 (en) * | 2014-05-19 | 2017-05-30 | Haier Us Appliance Solutions, Inc. | Systems and methods for receptacle auto fill using inductive sensing |
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 |
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 |
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 |
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 |
CN111397698A (en) * | 2020-01-03 | 2020-07-10 | 骆金山 | Current type water level display and controller |
Also Published As
Publication number | Publication date |
---|---|
JPS5443765A (en) | 1979-04-06 |
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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) |