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:
Dec. 21, 2010
Filed:
Nov. 21, 2005
Christian Matt, Aesch, CH;
Christian Matt, Aesch, CH;
Endress + Hauser GmbH + Co. KG, Maulburg, DE;
Abstract
To ascertain the mass-flow of a Coriolis mass-flow meter, an oscillation of a measuring tube is produced with the frequency f and the resulting oscillatory movement is registered at two different measuring points with two oscillation sensors. The analog sensor signals X, Xof the two oscillation sensors are converted into digital sensor signals Sand Sand further processed in a digital signal processor DSP. In the signal processor DSP, the sum signal Σ and the difference signal Δ are formed from the two sensor signals Sand S. Then the sum signal is rotated by 90°. In a further method step, the shifted sum signal is multiplied with the difference signal Δ. After ascertaining the amplitude of the sum signal Σ, the mass-flow is ascertained using the formula {dot over (m)}˜|Im(Δ)|/(|Σ|f). It is not necessary for the method, that the two sensor signals S, Shave equal amplitudes. Thus, a controlling of the analog signals X, Xto equal amplitudes can be omitted.