Device and process for detecting particles in a flowing liquid

US7956601B2 · kind B2 · utility

Assignee

• PRUEFTECHNIK DIETER BUSCH AG · DE

Inventors

• Edwin Becker · Reken, DE
• Thomas Knoell · Neu-Ulm, DE
• Roland Hoelzl · Munich, DE

Key dates

• Filing date: Dec 17, 2007
• Grant date: Jun 7, 2011
• Expiry date: Mar 25, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N15/0656
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A process and device for detecting electrically conductive particles in a liquid flowing in a pipe section, the liquid being exposed to periodic alternating electromagnetic fields by a transmitter coil which induces eddy currents in the particles, a probe made as a coil arrangement and which has an effective width producing a periodic electrical signal based on the eddy currents. The signal ha a carrier oscillation with an amplitude and/or phase which is modulated by particles passing across the effective width of the coil arrangement, the probe signal being filtered by a frequency-selective first filter unit, the filtered signal being sampled by a triggerable A/D converter stage to obtain a demodulated digital measurement signal, the digital measurement signal being filtered by a digital, frequency-selective adjustable second filter unit to obtain a useful signal, and the useful signal being evaluated to detect passage of electrically conductive particles in the pipe section.