Patent · US Active

Method for measuring a fluid density or a fluid viscosity

US9927402B2 · kind B2 · utility

2Cited by

2References

15Claims

0Family size

Assignee

ABB Schweiz AG · CH

Inventors

Axel Kramer · Greifswald, DE
Hubert Brandle · Oberengstringen, CH
Thomas Alfred Paul · Wädenswil, CH

Key dates

Filing date	Jul 28, 2014
Grant date	Mar 27, 2018
Priority date	—
Expiry date	Apr 22, 2036

Classification

Technology area (CPC G)Physics
CPC primaryG01N2291/0427
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method and device for estimating a density value ρm indicative of a true density ρ or for estimating a viscosity value ηm indicative of a true viscosity η of a fluid is disclosed. For this, a first resonance frequency fR of a first mechanical oscillator in a reference volume and a second resonance frequency fF of a second mechanical oscillator in contact with the fluid are measured. The estimated value ρm or ηm is then derived using these resonance frequencies fR and fF. During this derivation, at least one fluid-temperature- or fluid-pressure-dependent parameter of the fluid is used. Additionally or alternatively, the first (i.e. reference) mechanical oscillator is arranged in contact with a reference fluid. Thus, fundamental errors in the derivation of the estimated value ρm or ηm are reduced and the estimated value becomes more reliable.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.