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:
Aug. 12, 2008
Filed:
Oct. 13, 2006
Bernhard Michalski, Maulburg, DE;
Dominik Buser, Mohlin, CH;
Stefan Scherr, Kandern, DE;
Endress + Hauser GmbH + Co. KG, Maulburg, DE;
Abstract
A method for determining the fill level (l) on the basis of the travel time (t) of a high-frequency measuring signal (S), which is transformed into a lower frequency, intermediate-frequency measuring signal (S), wherein the transformation factor (K) is obtained from a difference frequency (f) between a pulse repetition frequency (f) and a sampling frequency (f) The pulse repetition frequency (f) or the sampling frequency (f) is altered on the basis of a control with a control variable (c_var) through an appropriate control algorithm, such that a desired value (f) of the difference frequency is controlled to; wherein a gradient (grad) of at least two values is determined, and on the basis of the gradient (grad) and the difference frequency (f), or difference time (t), in the case of a set control variable (c_var), an operating point (OP) of the control is determined, and the control algorithm is adjusted accordingly thereto.