US4599563A
Expired / Lapsed
US
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Barkhausen noise method for analyzing the anisotropic properties of ferromagnetic steel
Assignee: AST ACQUISITION Inc
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Filing: 1983-10-04
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Granted: 1986-07-08
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Expires: 2003-10-04
Abstract
Abstract A method for analyzing the anisotropic properties of ferromagnetic steels by use of Barkhausen noise simultaneously sensed in a plurality of directions without contact with the steel specimen.
Inventors
- 👤 Seppo I. Tiitto
- 👤 Kirsti I. Mielityinen-Tiitto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:39
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/14; G01N27/00; G01N27/72; G01N27/725; G01R; G01R33/00; G01R33/12; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02863
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
A method for determining the suitability of rolled ferromagnetic steel for further forming operations comprising the steps of: generating Barkhausen noise within the microstructure of said steel simultaneously in at least three different directions; sensing said Barkhausen noise in each of said directions without physical contact between the means for sensing and said steel; continuously monitoring the intensity variation of said sensed Barkhausen noise in each of said directions; constructing a noise pattern based on the Barkhausen noise intensity variations sensed in all of said directions; and comparing said pattern against predetermined Barkhausen noise intensity patterns representative of various steel qualities.
Claim 2
Independent Claim
101 words
A method for determining the suitability of rolled ferromagnetic steel for further forming operations comprising the steps of: generating Barkhausen noise within the microstructure of said steel simultaneously in at least three different directions; sensing said Barkhausen noise in each of said directions without physical contact between the means for sensing and said steel; continuously monitoring the intensity variation of said sensed Barkhausen noise in each of said directions; constructing a noise pattern based on the Barkhausen noise intensity variations sensed in all of said directions; and comparing said pattern against predetermined Barkhausen noise intensity patterns representative of various steel qualities.
Claim 3
Dependent Claim
21 words
A method as recited in claim 1 wherein: there is relative movement between said sensing means and said sheet of steel.
Claim 4
Dependent Claim
16 words
A method as recited in claim 2 wherein: said generating and sensing steps are conducted continuously.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |