EP1877767A2 - Sondes de test electromagnetiques a champ prochetm et a champ mixte : champ prochetm - champ eloigne, utiles pour inspecter des tuyaux et des tubes ferromagnetiques tels que ceux utilises dans les echangeurs de chaleur - Google Patents

Sondes de test electromagnetiques a champ prochetm et a champ mixte : champ prochetm - champ eloigne, utiles pour inspecter des tuyaux et des tubes ferromagnetiques tels que ceux utilises dans les echangeurs de chaleur

Info

Publication number
EP1877767A2
EP1877767A2 EP06758357A EP06758357A EP1877767A2 EP 1877767 A2 EP1877767 A2 EP 1877767A2 EP 06758357 A EP06758357 A EP 06758357A EP 06758357 A EP06758357 A EP 06758357A EP 1877767 A2 EP1877767 A2 EP 1877767A2
Authority
EP
European Patent Office
Prior art keywords
coils
send
field sensor
near field
receive
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Withdrawn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
EP06758357A
Other languages
German (de)
English (en)
Inventor
Henry Moncrieff O'connor
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1877767A2 publication Critical patent/EP1877767A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • 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
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents

Definitions

  • NEAR FIELDTM AND COMBINATION NEAR FIELD TM - REMOTE FIELD ELECTROMAGNETIC TESTING (ET) PROBES FOR INSPECTING FERROMAGNETIC PIPES AND TUBES SUCH AS THOSE USED IN HEAT EXCHANGERS
  • Three techniques are used for detecting defects in ferromagnetic heat exchanger tubes on the inside surface as well as the outside surface of a tube.
  • the flux field is constant. Variations in the flux field as the probe travels through the tube are taken to be flaws, support structure, or both. No alternating
  • Remote Field Eddy current Testing has separate send and receive coils in the
  • the receive signals are processed much like that in a regular eddy current application to inspect non-magnetic tubes and defects are detected
  • support structure blocks the flux that travels from the send to the receive coils on the outside of the tube.
  • RFET and flux leakage techniques are unable to distinguish between inside and outside defects.
  • a near field sensor assembly for inspecting ferromagnetic metal tubes for flaws comprises a probe for insertion of the near field sensor into a metal tube.
  • the probe has near field sensors
  • near field sensors are in combination with remote
  • Fig 1 is a schematic view of prior art eddy current testing arrangement over which the present inventor is an improvement.
  • Fig. 2A-2D are elevations of send and receive coils in perspective, configured in
  • Fig. 3A-3D are elevations of send and receive coils in perspective, configured in
  • Figs 4A-4D are elevations of send and receive coils, in perspective, configured in accordance with a third example of the present invention.
  • Figs. 5A-5D are elevations of send and receive coils, in perspective, according to a fourth
  • Figs . 6 A-6F are side elevations of send and receive coils in perspective according to a fifth example of the present invention.
  • Fig. V is a perspective view of a first alternate configuration for the receive coils of Figs. 1 -
  • Fig. 8 is a perspective view of a second alternate configuration for the receive coils of Figs. 1-6;
  • Fig. 9 is a perspective view of a combination of a near field sensor and a pair of remote field send coils using the near field sensors of Figs. 2-7, and
  • Fig. 10 is a perspective view of a combination near field-remote field sensor with shared send coils using the near field sensor of Figs. 2-7.
  • FIG. 1 there is shown schematic of a basic prior art arrangement for testing a ferromagnetic alloy tube 10 to detect in the wall 11 thereof anomalies such as
  • such tubes typically have an outside diameter in a range of about lcm to about 10cm and an inside diameter.
  • the probe 25 is a cylindrical device comprising a cylindrical housing 26
  • send coil 29 having therein send coil 29 and receiving coils 30.
  • the send coils 29 are spaced a distance from the receive coil of 21/2 to 3 diameters of the tube 10. As the probe 25 is advanced through the tube 10 with the excitation or send coils 29 generating eddy currents in the wall of
  • the receiving coils 30 detect the voltage and phase of the eddy current fields induced in the wall 11 of the tube 10.
  • a cable 32 connects the probe 25 to an eddy current testing circuit 34 which includes an oscillator 35 which connected via the cable 32 to the
  • excitation coil 29 to apply sine wave (or other wave shape) signals 36 to the excitation coil.
  • the receiving coils 30a and 30b detect the voltage and phase of the eddy current in the wall 11 of the tube 10 and transmits via the cable 32 the voltage and phase of the eddy current in the
  • eddy current detection circuit 38 converts the sinusoidal signals 37 to lissajous waveforms 39 which are displayed on a display 40.
  • two or more oscillators (often four) generate two or more simultaneous sine (or other wave shape) waves, which are applied simultaneously to the excitation coil.
  • receiving coils 30a and 30b detect the voltage and phase of all of these signals, and the eddy
  • the display 40 is either a cathode ray tube or, preferably the monitor of a computer which has the display capabilities of a cathode
  • the current invention set forth in Figs. 2-10 is similar to RFET in that there are both
  • send coils 50 and receive coils 52 are placed very close to or directly adjacent to the receive coils. There may be a very narrow separation but that
  • the separation is so small, the coils may touch and is orders of magnitude less than the 21/2 to 3 diameters of tube 10 of current RFET arrangements.
  • the send coils 50 send an alternating
  • the support structure has very
  • a coil portion 45 of Near Fieldi M sensor is shown which has several alternate configurations.
  • a send coil 50 is placed between two receive coils 52 (Fig. 2A); in a second configuration, a receive coil 52 is placed between
  • send coils 50 Fig. 2C
  • send coils 50 are separated by receive coils 52 (Fig. 2D).
  • the send coil or coils 50 are axially proximate the receive coils 52 with the send and receive coils having substantially the same
  • a coil portion 45' of a Near Field T M sensor has several alternative configurations, a send coil 50 is placed outside of one receive coil 52 (Fig. 3A); in
  • a send coil 50 is placed outside of two receive coils 52 (Fig. 3B); in a third configuration, a receive coil 52 is placed outside of a send coil 50 (Fig. 3C), and in a
  • a pair of axially spaced receive coils 52 are placed around send coil 50 (Fig. 3D).
  • send and receive coils 50 and 52 of different diameters.
  • a coil portion 45" of a Near Fieldt M sensor is shown which has several alternative configurations.
  • send coils 50 are placed in a first configuration.
  • a send coil 50 is placed between two receive coils 52 and an additional send
  • coil 50 is placed inside of the receive coils 52 (Fig. 4B); in a third configuration, send coils 50
  • Figs. 5A-5D include all of the configurations of Figs. 4A-4D except that in each Fig.
  • additional send coils 50 are placed outside of and around the receive coils 52.
  • Figs. 6A-6F include all of the configurations of Figs 5A-5D except that in each Fig. an additional send coil 50 is placed inside of the receive coils 52.
  • a Near Fieldi M probe 60 is provided with the configurations listed in Figs. 2A-2D through Fig. 6A-6F in which the receive coil or coils 52 are configured with multiple receive coils 52 A in which the axis 61 of each receive coil 52 is
  • a combination Near Fieldi M Remote Field probe 70 is shown with shared receive coils 52 which would be any of the configurations of Figs. 2-8, except that
  • one or two additional send coils 5OA and 5OB are placed in front of and/or after the Near
  • Figs. 2-8 except that one or two remote field receive coils 82 are placed in front of and/or

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

Pour détecter des pailles ou des dartres sur des tuyaux ou des tubes ferromagnétiques, on procède à une inspection qui consiste à introduire des sondes comprenant un capteur de champ proche comportant au moins une bobine d'envoi et au moins une bobine de réception qui sont situées exactement adjacentes entre elles. Selon diverses formes de réalisation, les bobine d'envoi et de réception peuvent présenter un diamètre identique ou différent ou bien peuvent être positionnées axialement adjacente l'une par rapport à l'autre. Les configurations du capteur de champ proche comprennent des agencements formés de multiples bobines d'envoi et de multiples bobines de réception. Le capteur de champ proche est, dans une forme de réalisation, associé à des bobines du capteur de champ éloigné et, dans une autre forme de réalisation, associé à un capteur de champ éloigné et à une bobine de réception du champ éloigné.
EP06758357A 2005-04-14 2006-04-14 Sondes de test electromagnetiques a champ prochetm et a champ mixte : champ prochetm - champ eloigne, utiles pour inspecter des tuyaux et des tubes ferromagnetiques tels que ceux utilises dans les echangeurs de chaleur Withdrawn EP1877767A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US67110605P 2005-04-14 2005-04-14
PCT/US2006/014206 WO2006113504A2 (fr) 2005-04-14 2006-04-14 Sondes de test electromagnetiques a champ prochetm et a champ mixte : champ prochetm - champ eloigne, utiles pour inspecter des tuyaux et des tubes ferromagnetiques tels que ceux utilises dans les echangeurs de chaleur

Publications (1)

Publication Number Publication Date
EP1877767A2 true EP1877767A2 (fr) 2008-01-16

Family

ID=37115754

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06758357A Withdrawn EP1877767A2 (fr) 2005-04-14 2006-04-14 Sondes de test electromagnetiques a champ prochetm et a champ mixte : champ prochetm - champ eloigne, utiles pour inspecter des tuyaux et des tubes ferromagnetiques tels que ceux utilises dans les echangeurs de chaleur

Country Status (2)

Country Link
EP (1) EP1877767A2 (fr)
WO (1) WO2006113504A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0813914D0 (en) * 2008-07-30 2008-09-03 Innospection Holdings Ltd Inspection apparatus and method
GB2475314B8 (en) 2009-11-16 2013-09-25 Innospection Group Ltd Remote environment inspection apparatus and method
JP5800696B2 (ja) * 2011-11-30 2015-10-28 日立交通テクノロジー株式会社 リモートフィールド渦電流探傷システムおよびリモートフィールド渦電流探傷方法
GB2537124B (en) 2015-04-07 2018-09-05 Innospection Group Ltd In-line inspection tool

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875502A (en) * 1973-05-24 1975-04-01 Foerster Inst Dr Friedrich Coil arrangement and circuit for eddy current testing
US4079312A (en) * 1976-08-17 1978-03-14 Allegheny Ludlum Industries, Inc. Continuous testing method and apparatus for determining the magnetic characteristics of a strip of moving material, including flux inducing and pick-up device therefor
CA1201481A (fr) * 1982-10-22 1986-03-04 Majesty (Her) In Right Of Canada As Represented By Atomic Energy Of Canada Limited/L'energie Atomique Du Canada Limitee Sonde a courant de foucault pouvant detecter le bruit du a une defectuosite
JP3428734B2 (ja) * 1994-08-01 2003-07-22 東京瓦斯株式会社 金属管探傷装置及び金属管探傷方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006113504A3 *

Also Published As

Publication number Publication date
WO2006113504A3 (fr) 2007-03-08
WO2006113504A2 (fr) 2006-10-26

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