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:
Jan. 19, 2010
Filed:
Mar. 21, 2007
Ulrich Ewerlin, Bochum, DE;
Ulrich Ewerlin, Bochum, DE;
Elster GmbH, Mainz-Kastel, DE;
Abstract
A method for measuring operational density and/or operational sound velocity in a gaseous medium uses a sound transducer that is capable of vibrating, which is disposed in a housing in such a manner that chambers having the same volume are formed on both sides of the sound transducer, which are filled by the gaseous medium. The chambers are connected with one another by way of an open channel having defined dimensions. Using an exciter vibration applied to the sound transducer, the impedance of the sound transducer, which is influenced by the density of the gaseous medium, is determined within a frequency range that can be established, as a function of the exciter frequency. From this, the operational density and/or the operational sound velocity of the gaseous medium are determined using a plurality of characteristic frequencies of the sound transducer vibrating in the gaseous medium.