WO2001029500A3 - A digital eddy current proximity system: apparatus and method - Google Patents

A digital eddy current proximity system: apparatus and method Download PDF

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Publication number
WO2001029500A3
WO2001029500A3 PCT/US2000/041257 US0041257W WO0129500A3 WO 2001029500 A3 WO2001029500 A3 WO 2001029500A3 US 0041257 W US0041257 W US 0041257W WO 0129500 A3 WO0129500 A3 WO 0129500A3
Authority
WO
WIPO (PCT)
Prior art keywords
eddy current
digital
current proximity
proximity system
digital eddy
Prior art date
Application number
PCT/US2000/041257
Other languages
French (fr)
Other versions
WO2001029500A2 (en
WO2001029500A9 (en
Inventor
Rich Slates
Original Assignee
Bently Nevada Corp
Rich Slates
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 Bently Nevada Corp, Rich Slates filed Critical Bently Nevada Corp
Priority to EP00988463A priority Critical patent/EP1247111B1/en
Priority to DE60041086T priority patent/DE60041086D1/en
Priority to DK00988463T priority patent/DK1247111T3/en
Priority to JP2001532047A priority patent/JP2003512609A/en
Priority to AU24670/01A priority patent/AU2467001A/en
Publication of WO2001029500A2 publication Critical patent/WO2001029500A2/en
Publication of WO2001029500A3 publication Critical patent/WO2001029500A3/en
Publication of WO2001029500A9 publication Critical patent/WO2001029500A9/en

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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
    • G01D5/2006—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 self-induction of one or more coils
    • G01D5/202—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 self-induction of one or more coils by movable a non-ferromagnetic conductive element
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
    • 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
    • G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
    • 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
    • G01N27/9046—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 by analysing electrical signals

Abstract

A digital eddy current proximity system including a digital impedance measuring device (12) for digitally measuring the proximity probes impedance correlative to displacement motion and position of a metallic target (T) object being monitored. The system further including a cable-length calibration method, an automatic material identification and calibration method, a material insensitive method, an inductive ratio method and advanced sensing characteristics.
PCT/US2000/041257 1999-10-22 2000-10-17 A digital eddy current proximity system: apparatus and method WO2001029500A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP00988463A EP1247111B1 (en) 1999-10-22 2000-10-17 A digital eddy current proximity system: apparatus and method
DE60041086T DE60041086D1 (en) 1999-10-22 2000-10-17 DIGITAL SWITCH CURRENT BORDING SYSTEM, APPARATUS AND METHOD
DK00988463T DK1247111T3 (en) 1999-10-22 2000-10-17 Digital eddy current proximity system: apparatus and method
JP2001532047A JP2003512609A (en) 1999-10-22 2000-10-17 Digital eddy current proximity system, apparatus and method
AU24670/01A AU2467001A (en) 1999-10-22 2000-10-17 A digital eddy current proximity system: apparatus and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/425,830 US6346807B1 (en) 1999-10-22 1999-10-22 Digital eddy current proximity system: apparatus and method
US09/425,830 1999-10-22

Publications (3)

Publication Number Publication Date
WO2001029500A2 WO2001029500A2 (en) 2001-04-26
WO2001029500A3 true WO2001029500A3 (en) 2001-06-21
WO2001029500A9 WO2001029500A9 (en) 2002-12-05

Family

ID=23688208

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/041257 WO2001029500A2 (en) 1999-10-22 2000-10-17 A digital eddy current proximity system: apparatus and method

Country Status (8)

Country Link
US (18) US6346807B1 (en)
EP (1) EP1247111B1 (en)
JP (1) JP2003512609A (en)
AT (1) ATE417278T1 (en)
AU (1) AU2467001A (en)
DE (1) DE60041086D1 (en)
DK (1) DK1247111T3 (en)
WO (1) WO2001029500A2 (en)

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