Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2003-07-18
2008-10-14
San Martin, Jaydi A (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S316030
Reexamination Certificate
active
07436100
ABSTRACT:
A vibration detector for determining and/or monitoring a predetermined fill level in a container. The detector includes an oscillatable unit, a driver/receiver unit and an evaluation unit. The vibration detector can, additionally, be used as a viscosity sensor or as a density sensor. For providing a multivariable sensor, a microprocessor is provided in the oscillation circuit formed of oscillatable unit and feedback electronics. The microprocessor corrects the phase of the feedback electronics over a predetermined frequency bandwidth in such a way that the sum of the phases of the feedback electronics and the microprocessor follows a predetermined function f(v).
REFERENCES:
patent: 5533381 (1996-07-01), Seale
patent: 2005/0140522 (2005-06-01), Heilig et al.
D'Angelico Sascha
Mueller Alexander
Bacon & Thomas PLLC
Endress & Hauser GmbH & Co. KG
Martin Jaydi A San
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