Electricity: measuring and testing – Magnetic – Fluid material examination
Reexamination Certificate
2011-06-07
2011-06-07
Patidar, Jay M (Department: 2858)
Electricity: measuring and testing
Magnetic
Fluid material examination
C073S053070, C702S149000
Reexamination Certificate
active
07956601
ABSTRACT:
A process and device for detecting electrically conductive particles in a liquid flowing in a pipe section, the liquid being exposed to periodic alternating electromagnetic fields by a transmitter coil which induces eddy currents in the particles, a probe made as a coil arrangement and which has an effective width producing a periodic electrical signal based on the eddy currents. The signal ha a carrier oscillation with an amplitude and/or phase which is modulated by particles passing across the effective width of the coil arrangement, the probe signal being filtered by a frequency-selective first filter unit, the filtered signal being sampled by a triggerable A/D converter stage to obtain a demodulated digital measurement signal, the digital measurement signal being filtered by a digital, frequency-selective adjustable second filter unit to obtain a useful signal, and the useful signal being evaluated to detect passage of electrically conductive particles in the pipe section.
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Becker Edwin
Hoelzl Roland
Knoell Thomas
Patidar Jay M
Prueftechnik Dieter Busch AG
Roberts Mlotkowski Safran & Cole P.C.
Safran David S.
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