Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reexamination Certificate
2008-09-09
2008-09-09
Aurora, Reena (Department: 2862)
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
Reexamination Certificate
active
10595899
ABSTRACT:
Method for nondestructive and contact-free detection of faults in a test specimen which is moved relative to a probe that detects a periodic electrical signal having a carrier oscillation whose amplitude and/or phase is/are modulated by any fault in the test specimen. The probe signal is filtered and sampled by a triggerable A/D converter stage to obtain a demodulated digital measurement signal which is filtered using a digital frequency-selective adjustable second filter unit to obtain a useful signal which is evaluated to detect a fault in the test specimen. The A/D converter stage is triggered at a fraction of the frequency of the carrier oscillation selected as a function of the fault frequency obtained as the quotient of the relative speed between the test specimen and the probe and the effective width of the probe, and the frequency-selective second filter unit is adjusted as a function of the fault frequency.
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patent: WO 95/16912 (1995-06-01), None
Hermann Michael
Hoelzl Roland
Aurora Reena
Prüftechnik Dieter Busch AG
Safran David S.
Whittington Kenneth J
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