Measuring instrument and method of measuring flows

US7248974B2 · kind B2 · utility

Assignee

• ABB PATENT GMBH · DE

Inventors

• Axel Rossberg · Glückstadt, DE
• Kilian Bartholome · Glückstadt, DE
• Jens Timmer · Glückstadt, DE
• Rene Friedrichs · Göttingen, DE
• Frank Buhl · Rosdorf, DE
• Jorg Herwig · Dransfeld, DE

Key dates

• Filing date: Sep 17, 2004
• Grant date: Jul 24, 2007
• Expiry date: Feb 5, 2025

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F1/3287
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A measuring instrument whose measuring principle is based on an oscillator, for example an eddy counter, and in which there is arranged a sensor for recording a measured signal (S(t)), which can be supplied to an evaluation unit (2), characterized in that, from the phase increments psi(tau,t), that is to say from the differences between the instantaneous values phi(t) of the phase signal derived from the measured signal S(t) in a phase extractor (18) and values phi(t-tau) time-delayed by a delayed time tau, a coupling indicator value (KI) is formed in such a way that the existence of phase coupling with a further oscillator can be detected on the latter by means of comparison with a coupling reference value (KR).