Method and apparatus for the optical measurement of fluid flow

US4707130A · kind A · utility

Assignee

• MTU Motoren-und Turbinen-Union München GmbH · DE

Inventors

• Jörg Hofmann · Krefeld, DE
• Kurt Ding · Augsburg, DE

Key dates

• Filing date: Dec 21, 1984
• Grant date: Nov 17, 1987
• Expiry date: Dec 21, 2004

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F1/704
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Method and apparatus for optical measurement of fluid flow in which particles are injected into the fluid flow to permit accurate velocity measurements to be made thereof between two laser beams through measuring windows and to obtain a velocity profile. One beam is fixed and provides indication of start event, and the other beam is moved in discrete angular steps around the first beam in oscillatory fashion to provide indication of stop events. The sum of the particles passing the start beam and the sum of the particles subsequently passing the stop beam are correlated by electronic evaluation circuitry.