Method and apparatus for determining the particles contained in a particle stream

US8345236B2 · kind B2 · utility

Assignee

• Parsum GmbH · DE

Inventors

• Stefan Dietrich · Potsdam, DE
• Guenter Eckardt · Nuremberg, DE
• Michael Koehler · Oberlungwitz, DE

Key dates

• Filing date: Apr 30, 2007
• Grant date: Jan 1, 2013
• Expiry date: Apr 27, 2029

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2015/1402
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method and an apparatus for determining the particle content of a particle stream using a source of light and two receivers arranged offset from one another in the flow direction of the particle stream. The receivers provide an electrical signal to an evaluation unit as a function of the radiation intensity which they receive, and this signal makes possible a determination of the flow velocity and particle size. Coincident passage of two particles is indicated by a pulse occurring in the signal due to a “roof collapse” in the pulse caused by a weakening of the radiation intensity as the particles pass a receiver.