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GB2021770A - Distance measuring - Google Patents

Distance measuring

Info

Publication number
GB2021770A
GB2021770A GB7844932A GB7844932A GB2021770A GB 2021770 A GB2021770 A GB 2021770A GB 7844932 A GB7844932 A GB 7844932A GB 7844932 A GB7844932 A GB 7844932A GB 2021770 A GB2021770 A GB 2021770A
Authority
GB
United Kingdom
Prior art keywords
transducer
piston
hydraulic ram
movable parts
primary
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.)
Granted
Application number
GB7844932A
Other versions
GB2021770B (en
Inventor
Brian Georg Davidson Smart
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.)
Cardiff University
Original Assignee
Cardiff University
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 Cardiff University filed Critical Cardiff University
Priority to GB7844932A priority Critical patent/GB2021770B/en
Publication of GB2021770A publication Critical patent/GB2021770A/en
Application granted granted Critical
Publication of GB2021770B publication Critical patent/GB2021770B/en
Expired legal-status Critical Current

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
    • G01D5/204—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 by influencing the mutual induction between two or more coils
    • G01D5/2046—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 by influencing the mutual induction between two or more coils by a movable ferromagnetic element, e.g. a core
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

A transducer for measuring relatively large displacements between relatively movable parts of apparatus, such as the piston (14) and cylinder (12) say of a hydraulic ram (10) comprises as or fixed to one such part an elongate transducer element (20) carrying primary (40) and secondary (42) windings wound longitudinally thereof to generate a magnetic field into or in which the other of the relatively movable parts is movable to vary the magnetic intercoupling between the primary and secondary windings. The other part may be a part of the transducer or of the apparatus itself. Thus, in an hydraulic ram the elongate element may be fixed relative to a cylinder end wall (24) to extend into a longitudinal bore (26) of the piston. Or the bore may be fitted with a sleeve. <IMAGE>
GB7844932A 1978-04-11 1978-11-17 Distance measuring Expired GB2021770B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7844932A GB2021770B (en) 1978-04-11 1978-11-17 Distance measuring

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1407178 1978-04-11
GB7844932A GB2021770B (en) 1978-04-11 1978-11-17 Distance measuring

Publications (2)

Publication Number Publication Date
GB2021770A true GB2021770A (en) 1979-12-05
GB2021770B GB2021770B (en) 1982-08-18

Family

ID=26250259

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7844932A Expired GB2021770B (en) 1978-04-11 1978-11-17 Distance measuring

Country Status (1)

Country Link
GB (1) GB2021770B (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2539868A1 (en) * 1983-01-25 1984-07-27 Feuillee Michel Capacitive displacement sensor integrated with a machine member of the piston/cylinder type
FR2568999A1 (en) * 1984-08-07 1986-02-14 Peugeot DISPLACEMENT SENSOR WITHOUT CONTACTS
GB2206212A (en) * 1987-06-24 1988-12-29 Alexander Russell Determining position and/or replacement
US4855675A (en) * 1984-05-21 1989-08-08 Sacol Powerline Limited Inductive transducers for indicating establishment of a preselected spatial relationship between two parts
US5150615A (en) * 1991-01-18 1992-09-29 Nartron Corporation Liquid level sensor
US5210490A (en) * 1989-01-11 1993-05-11 Nartron Corporation Linear position sensor having coaxial or parallel primary and secondary windings
US5216364A (en) * 1989-01-11 1993-06-01 Nartron Corporation Variable transformer position sensor
EP0595366A1 (en) * 1988-01-22 1994-05-04 Data Instruments Inc. Linear displacement transducer particularly useful for hydraulic and pneumatic cylinders
US5318616A (en) * 1991-10-09 1994-06-07 Emhart Glass Machinery Investments Inc. Plunger mechanism with a Hall sensor movement detection device for a glassware forming machine
DE4306539A1 (en) * 1993-03-03 1994-09-08 Festo Kg Device for detecting the position of the piston of a working cylinder
US5619133A (en) * 1989-01-11 1997-04-08 Nartron Corporation Single coil position and movement sensor having enhanced dynamic range
US5811967A (en) * 1989-01-11 1998-09-22 Nartron Corporation EGR valve linear position sensor having variable coupling transformer
WO2000065299A3 (en) * 1999-04-23 2001-03-22 Scient Generics Ltd Position sensor
WO2004011813A1 (en) * 2002-07-25 2004-02-05 Maritime Hydraulics As Method and device for discrete determination of the relative position of an accumulator's deviding piston
EP1435462A1 (en) * 2002-12-31 2004-07-07 Caterpillar Inc. Position sensing cylinder cap for ease of service and assembly
US7121185B2 (en) 2004-05-28 2006-10-17 Caterpillar Inc. Hydraulic cylinder having a snubbing valve
DE102015015478B3 (en) * 2015-11-28 2016-12-29 Beiqi Foton Motor Co., Ltd. Device for guiding and supporting a sensor rod in a deep hole of a piston rod of a hydraulic cylinder

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2539868A1 (en) * 1983-01-25 1984-07-27 Feuillee Michel Capacitive displacement sensor integrated with a machine member of the piston/cylinder type
US4855675A (en) * 1984-05-21 1989-08-08 Sacol Powerline Limited Inductive transducers for indicating establishment of a preselected spatial relationship between two parts
FR2568999A1 (en) * 1984-08-07 1986-02-14 Peugeot DISPLACEMENT SENSOR WITHOUT CONTACTS
EP0174227A1 (en) * 1984-08-07 1986-03-12 Automobiles Peugeot Contactless displacement detector
GB2206212A (en) * 1987-06-24 1988-12-29 Alexander Russell Determining position and/or replacement
EP0595366A1 (en) * 1988-01-22 1994-05-04 Data Instruments Inc. Linear displacement transducer particularly useful for hydraulic and pneumatic cylinders
US5811967A (en) * 1989-01-11 1998-09-22 Nartron Corporation EGR valve linear position sensor having variable coupling transformer
US5210490A (en) * 1989-01-11 1993-05-11 Nartron Corporation Linear position sensor having coaxial or parallel primary and secondary windings
US5216364A (en) * 1989-01-11 1993-06-01 Nartron Corporation Variable transformer position sensor
US5619133A (en) * 1989-01-11 1997-04-08 Nartron Corporation Single coil position and movement sensor having enhanced dynamic range
US5150615A (en) * 1991-01-18 1992-09-29 Nartron Corporation Liquid level sensor
US5318616A (en) * 1991-10-09 1994-06-07 Emhart Glass Machinery Investments Inc. Plunger mechanism with a Hall sensor movement detection device for a glassware forming machine
DE4306539A1 (en) * 1993-03-03 1994-09-08 Festo Kg Device for detecting the position of the piston of a working cylinder
WO2000065299A3 (en) * 1999-04-23 2001-03-22 Scient Generics Ltd Position sensor
US6642710B2 (en) 1999-04-23 2003-11-04 Scientific Generics Limited Position sensor
WO2004011813A1 (en) * 2002-07-25 2004-02-05 Maritime Hydraulics As Method and device for discrete determination of the relative position of an accumulator's deviding piston
EP1435462A1 (en) * 2002-12-31 2004-07-07 Caterpillar Inc. Position sensing cylinder cap for ease of service and assembly
US7023199B2 (en) 2002-12-31 2006-04-04 Caterpillar Inc. Position sensing cylinder cap for ease of service and assembly
US7121185B2 (en) 2004-05-28 2006-10-17 Caterpillar Inc. Hydraulic cylinder having a snubbing valve
DE102015015478B3 (en) * 2015-11-28 2016-12-29 Beiqi Foton Motor Co., Ltd. Device for guiding and supporting a sensor rod in a deep hole of a piston rod of a hydraulic cylinder

Also Published As

Publication number Publication date
GB2021770B (en) 1982-08-18

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee