Electricity: measuring and testing – Magnetic – Plural tests
Patent
1989-09-12
1991-01-22
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Plural tests
324223, 324226, 324235, 324242, 324248, 250306, 376249, G01R 3312, G01N 2772, G01N 23225, G21C 1700
Patent
active
049873679
ABSTRACT:
Measurement of a physical property such as coercive force of a member to be inspected is performed at a plurality of locations in one region of the member. Similar measurement is performed in a plurality of different regions of the member and a maximum or minimum value (extreme value) is determined for each of the regions. On the basis of the extreme values thus determined, a recurrence period is determined in accordance with an extreme value statistic theory with the aid of a computer, whereon an estimated maximum value of the physical property of the member as a whole is determined from the recurrence period. On the basis of the estimated maximum value, the degree of deterioration of the member is predicted by the computer by consulting the data indicating the previously determined relation between the physical property and the degree of deterioration.
REFERENCES:
patent: 4692701 (1987-09-01), Dundas et al.
patent: 4881030 (1989-11-01), Stuecker et al.
Ishikawa, Yuichi; "A Microcomputer Based Prediction of The Probable Maximum Pit Depth on Pipelines by Means of Extreme Value Statistical Analysis", Critical Issues in Reducing the Corrosion of Steels, Mar. 1985, pp. 320-325 Editors H. Leidheiser, Jr. and S. Haruyama.
Ishikawa Yuichi
Otaka Masahiro
Shimizu Tasuku
Takaku Kazuo
Yoshimura Toshihiko
Hitachi Ltd
Strecker Gerard R.
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