Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reexamination Certificate
2011-03-22
2011-03-22
Aurora, Reena (Department: 2858)
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
C324S262000, C324S228000
Reexamination Certificate
active
07911206
ABSTRACT:
The surface length of a metal subject to be inspected is evaluated by detecting an eddy current without using a combination of a scale and visual or liquid penetrant inspection. An exciting coil and a detecting coil are scanned above the subject in a length direction. An eddy current detector measures an output voltage corresponding to scanning positions based on an output from the detecting coil. Based on an output voltage distribution curve indicating a distribution of output voltages corresponding to the scanning positions, position information is extracted corresponding to values which are within a differential voltage range and lower by 12 dB than a maximum value of the output voltages on the left and right sides of the distribution. A distance between the positions included in the extracted information is calculated to evaluate the length of a slit which is a defect present on the subject surface.
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Koike Masahiro
Nakamura Motoyuki
Nishimizu Akira
Nonaka Yoshio
Taki Akihiro
Aurora Reena
Brundidge & Stanger, P.C.
Hitachi , Ltd.
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