Fiber-optical Doppler anemometer

US4637716A · kind A · utility

Assignee

• BASF SE

Inventors

• Helmut Auweter · Schifferstadt, DE
• Dieter Horn · Heidelberg, DE
• Erik Lueddecke · Mutterstadt, DE

Key dates

• Filing date: Sep 20, 1983
• Grant date: Jan 20, 1987
• Expiry date: Sep 20, 2003

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P5/26
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a fiber-optical Doppler anemometer for measurement of fluctuating light or the Doppler broadening of laser light scattered by a scattering medium, for example by particles in motion, coherent laser light is passed via a fiber-optical coupler (1) and a submerged fiber-optical probe (2) into the scattering medium, and the light scattered back by the scattering medium is picked up by the submerged fiber-optical probe (2), branched by the fiber-optical coupler (1) and passed to a photodetector (3).