GB2004374A - Apparatus for detecting the presence of discontinuities in the flow of fluid flow-lines - Google Patents

Apparatus for detecting the presence of discontinuities in the flow of fluid flow-lines

Info

Publication number
GB2004374A
GB2004374A GB7837197A GB7837197A GB2004374A GB 2004374 A GB2004374 A GB 2004374A GB 7837197 A GB7837197 A GB 7837197A GB 7837197 A GB7837197 A GB 7837197A GB 2004374 A GB2004374 A GB 2004374A
Authority
GB
United Kingdom
Prior art keywords
coils
signals
discontinuities
demodulator
oscillator
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Withdrawn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
GB7837197A
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.)
Smiths Group PLC
Original Assignee
Smiths Group PLC
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 Smiths Group PLC filed Critical Smiths Group PLC
Priority to GB7837197A priority Critical patent/GB2004374A/en
Publication of GB2004374A publication Critical patent/GB2004374A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/1031—Investigating individual particles by measuring electrical or magnetic effects thereof, e.g. conductivity or capacity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/023—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance where the material is placed in the field of a coil

Abstract

Particle detector apparatus for counting the number of ferromagnetic particles passing along an oil- or fuel- flow line 3 of an aircraft engine includes inductance coils 1, 2 wound around the flow line 3, which are supplied with an alternating input signal from an oscillator 4. An output signal from the coils 1, 2, is supplied to a demodulator 6 which is controlled to pass preferentially those signals having a predetermined phase relationship set by phase shift unit 7 with respect to the input signal so as to distinguish between ferromagnetic particles and other discontinuities. Signals from the demodulator 6 are passed to an amplitude detector 9 which in turn passes only those signals over a predetermined amplitude to a counter 10. The amplitude detector 9 may have more than one output, passing signals of different amplitudes to different counters 10, 101, 102 so as to provide a count of particles having different characteristics. The coils 1, 2 may form part of the frequency determining circuit of oscillator 4 or connected in a bridge circuit. A plurality of channels may be tested each being provided with a respective coil. <IMAGE>
GB7837197A 1977-09-19 1978-09-18 Apparatus for detecting the presence of discontinuities in the flow of fluid flow-lines Withdrawn GB2004374A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7837197A GB2004374A (en) 1977-09-19 1978-09-18 Apparatus for detecting the presence of discontinuities in the flow of fluid flow-lines

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3902477 1977-09-19
GB7837197A GB2004374A (en) 1977-09-19 1978-09-18 Apparatus for detecting the presence of discontinuities in the flow of fluid flow-lines

Publications (1)

Publication Number Publication Date
GB2004374A true GB2004374A (en) 1979-03-28

Family

ID=26263976

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7837197A Withdrawn GB2004374A (en) 1977-09-19 1978-09-18 Apparatus for detecting the presence of discontinuities in the flow of fluid flow-lines

Country Status (1)

Country Link
GB (1) GB2004374A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508168A1 (en) * 1981-06-22 1982-12-24 Smiths Industries Plc PARTICULATE DETECTOR APPARATUS
GB2140568A (en) * 1983-04-27 1984-11-28 Pall Corp Electromagnetic detector for metallic materials
EP0199069A2 (en) * 1985-03-22 1986-10-29 Glyco-Metall-Werke Daelen & Loos GmbH Monitoring device for the operation state of bearings
EP0206440A3 (en) * 1985-01-07 1987-10-14 Conductiv Diagnostics Res Ltd Apparatus for measuring the electrical conductivity of a subject
US4837511A (en) * 1985-04-26 1989-06-06 Ranco Europe Limited Method and apparatus for identifying the metal included in a metallic item
WO2014005673A1 (en) * 2012-07-03 2014-01-09 Hydac Filter Systems Gmbh Method for detecting particles in a fluid stream
CN104697905A (en) * 2015-03-20 2015-06-10 桂林电子科技大学 Oil abrasive particle detecting sensor and design method thereof
CN106568691A (en) * 2016-10-20 2017-04-19 江苏大学镇江流体工程装备技术研究院 Oil liquid abrasive particle online monitoring apparatus
EP3363518A1 (en) * 2017-02-15 2018-08-22 Safran Aero Boosters SA Method and system for detecting debris for a turbine engine
JP2019035681A (en) * 2017-08-17 2019-03-07 株式会社神戸製鋼所 Metallic foreign matter detector

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508168A1 (en) * 1981-06-22 1982-12-24 Smiths Industries Plc PARTICULATE DETECTOR APPARATUS
GB2140568A (en) * 1983-04-27 1984-11-28 Pall Corp Electromagnetic detector for metallic materials
US4613815A (en) * 1983-04-27 1986-09-23 Pall Corporation Electromagnetic detector for metallic materials having an improved phase detection circuit
EP0206440A3 (en) * 1985-01-07 1987-10-14 Conductiv Diagnostics Res Ltd Apparatus for measuring the electrical conductivity of a subject
EP0199069A2 (en) * 1985-03-22 1986-10-29 Glyco-Metall-Werke Daelen & Loos GmbH Monitoring device for the operation state of bearings
EP0199069A3 (en) * 1985-03-22 1987-12-09 Glyco-Metall-Werke Daelen & Loos GmbH Monitoring device for the operation state of bearings
US4837511A (en) * 1985-04-26 1989-06-06 Ranco Europe Limited Method and apparatus for identifying the metal included in a metallic item
WO2014005673A1 (en) * 2012-07-03 2014-01-09 Hydac Filter Systems Gmbh Method for detecting particles in a fluid stream
US9518913B2 (en) 2012-07-03 2016-12-13 Hydac Filter Systems Gmbh Method for detecting particles in a fluid stream
CN104697905A (en) * 2015-03-20 2015-06-10 桂林电子科技大学 Oil abrasive particle detecting sensor and design method thereof
CN104697905B (en) * 2015-03-20 2017-04-05 桂林电子科技大学 A kind of method for designing and oil liquid abrasive grain detection means of oil liquid abrasive grain detection sensor
CN106568691A (en) * 2016-10-20 2017-04-19 江苏大学镇江流体工程装备技术研究院 Oil liquid abrasive particle online monitoring apparatus
CN106568691B (en) * 2016-10-20 2019-03-05 江苏大学镇江流体工程装备技术研究院 A kind of oil liquid abrasive grain on-Line Monitor Device
EP3363518A1 (en) * 2017-02-15 2018-08-22 Safran Aero Boosters SA Method and system for detecting debris for a turbine engine
JP2019035681A (en) * 2017-08-17 2019-03-07 株式会社神戸製鋼所 Metallic foreign matter detector

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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)