The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 17, 2015
Filed:
Apr. 23, 2010
Martin Hortenbach, Linkenheim-Hochstetten, DE;
Martin Urban, Lörrach, DE;
Dietmar Frühauf, Lörrach, DE;
Tobias Brengartner, Freiburg, DE;
Frank Ruhnau, Straubenhardt, DE;
Michael Siegel, Karlsruhe, DE;
Martin Hortenbach, Linkenheim-Hochstetten, DE;
Martin Urban, Lörrach, DE;
Dietmar Frühauf, Lörrach, DE;
Tobias Brengartner, Freiburg, DE;
Frank Ruhnau, Straubenhardt, DE;
Michael Siegel, Karlsruhe, DE;
Endress + Hauser GmbH + Co. KG, Maulburg, DE;
Abstract
A method and an apparatus for determining or monitoring a predetermined fill level, a phase boundary or a density of a medium in a container with an oscillatable unit. The oscillatable unit is placed at the height of the predetermined fill level and is excited to oscillate successively with discrete exciter frequencies following one another in a frequency scanning operation (sweep) within a predeterminable frequency band in the working range of the oscillatable unit. The corresponding oscillations of the oscillatable unit are received in the form of received signals; wherein that exciter frequency is ascertained in the frequency scanning operation, at which the oscillatable unit oscillates with an oscillation frequency, which has a predetermined phase shift between the transmission signal and the received signal; and wherein the transmitting/receiving unit excites the oscillatable unit to oscillate with the ascertained oscillation frequency.