Method for determining and/or monitoring viscosity and corresponding apparatus

US8756980B2 · kind B2 · utility

Assignee

• ENDRESS+HAUSER GMBH+CO.KG · DE

Inventors

• Sascha D' Angelico · Weil am Rhein, DE
• Martin Urban · Bad Kötzting, DE

Key dates

• Filing date: Aug 11, 2008
• Grant date: Jun 24, 2014
• Expiry date: Jan 4, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N9/002
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for determining and/or monitoring the viscosity of a medium, wherein a mechanically oscillatable unit is excited to execute oscillations based on an exciter signal, and wherein oscillations are received from the mechanically oscillatable unit and transduced into a received signal. The eigenfrequency and/or resonance frequency of the mechanically oscillatable unit and/or phase relationship between the exciter signal and the received signal are/is ascertained and/or monitored, and, from changes in the eigenfrequency and/or resonance frequency and/or phase relationship, a change in viscosity is deduced and/or, based on dependencies of the oscillations on the viscosity of the medium, from the eigenfrequency and/or resonance frequency and/or phase relationship, viscosity is ascertained. In a second variant of the method, decay behavior of the mechanically oscillatable unit is evaluated. An apparatus for determining and/or monitoring viscosity is also presented.