SE7813344L - MET AND / OR COMPENSATION DEVICE - Google Patents

MET AND / OR COMPENSATION DEVICE

Info

Publication number
SE7813344L
SE7813344L SE7813344A SE7813344A SE7813344L SE 7813344 L SE7813344 L SE 7813344L SE 7813344 A SE7813344 A SE 7813344A SE 7813344 A SE7813344 A SE 7813344A SE 7813344 L SE7813344 L SE 7813344L
Authority
SE
Sweden
Prior art keywords
compensation
frequencies
transmitter
omega
frequency components
Prior art date
Application number
SE7813344A
Other languages
Unknown language ( )
Swedish (sv)
Inventor
Bengt Hjalmar Tornblom
Original Assignee
Bengt Hjalmar Tornblom
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 Bengt Hjalmar Tornblom filed Critical Bengt Hjalmar Tornblom
Priority to SE7813344A priority Critical patent/SE7813344L/en
Priority to DE19792952129 priority patent/DE2952129A1/en
Priority to GB7944375A priority patent/GB2041535A/en
Publication of SE7813344L publication Critical patent/SE7813344L/en

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
    • 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
    • G01N27/9053—Compensating for probe to workpiece spacing
    • 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

A device for testing and/or measuring electrically conductive material comprises means 1 for generating at least two frequencies or frequency components omega 1- omega n which via a transmitter 2 induce a magnetic field in the material, and a control servo 5 for compensation of signals of the frequencies or frequency components derived from the transmitter 2. The compensation is such that an error signal resulting from a varying parameter such as varying lift-off, temperature or dimension is generally suppressed. This can be achieved by suppression of relatively slow signal variations but not the more rapid signal variations arising from the changes or deviations to be measured. <IMAGE>
SE7813344A 1978-12-28 1978-12-28 MET AND / OR COMPENSATION DEVICE SE7813344L (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE7813344A SE7813344L (en) 1978-12-28 1978-12-28 MET AND / OR COMPENSATION DEVICE
DE19792952129 DE2952129A1 (en) 1978-12-28 1979-12-22 DEVICE FOR TESTING AND / OR MEASURING ELECTRICALLY CONDUCTIVE, SOLID, LIQUID, OR POWDERED MATERIALS FOR MATERIAL ERRORS, MATERIAL CHANGES OR CHANGING YOUR ELECTRICAL PROPERTIES
GB7944375A GB2041535A (en) 1978-12-28 1979-12-24 A measuring and/or testing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7813344A SE7813344L (en) 1978-12-28 1978-12-28 MET AND / OR COMPENSATION DEVICE

Publications (1)

Publication Number Publication Date
SE7813344L true SE7813344L (en) 1980-06-29

Family

ID=20336705

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7813344A SE7813344L (en) 1978-12-28 1978-12-28 MET AND / OR COMPENSATION DEVICE

Country Status (3)

Country Link
DE (1) DE2952129A1 (en)
GB (1) GB2041535A (en)
SE (1) SE7813344L (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318617A (en) * 1979-12-14 1982-03-09 Keuffel & Esser Company DC Shift error correction for electro-optical measuring system
DE3129321C2 (en) * 1981-07-24 1986-11-06 Ri&zcaron;skij politechni&ccaron;eskij institut, Riga Process and device for the non-destructive control of spot welded joints
SE436228B (en) * 1982-11-24 1984-11-19 Bengt Hjalmar Tornblom DEVICE FOR CHECKING OBJECTS WITH REGARD TO CHANGES
SE456043B (en) * 1984-02-10 1988-08-29 Bengt Hjalmar Tornblom SET AND DEVICE FOR TESTING AND / OR SATURING ELECTRICALLY CONDUCTIVE PROVOBECTS WITH REGARD TO CHANGES
GB2165650B (en) * 1984-04-09 1988-04-27 Dennis Amerena Parker Method and apparatus for the quantative and qualitative measurement of small metal particles
DE3517114A1 (en) * 1985-05-11 1986-11-13 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Eddy-current method for studying stress corrosion cracking in austenitic components, and appliance for implementing the method
GB8614746D0 (en) * 1986-06-17 1986-07-23 Nicholas M J Sensing device
SE456863B (en) * 1986-07-15 1988-11-07 Toernbloms Kvalitetskontroll MEASURING AND / OR CONTROL DEVICE Utilizing vortex flow technology with suppression of benign surface deformations
DE4322987C2 (en) * 1993-07-09 1997-04-10 Erwin Halstrup Coil for generating an alternating magnetic field
FR2712975B1 (en) * 1993-11-23 1996-08-02 Framatome Sa Method of non-destructive testing of a thin tube by eddy currents and eddy current sensor.

Also Published As

Publication number Publication date
GB2041535A (en) 1980-09-10
DE2952129A1 (en) 1980-07-10

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