Fiber-optical sensor

US5011279A · kind A · utility

Assignee

• BASF SE

Inventors

• Helmut Auweter · Schifferstadt, DE
• Dieter Horn · Heidelberg, DE
• Dieter Lilge · Schifferstadt, DE
• Juergen Wortmann · Schifferstadt, DE

Key dates

• Filing date: Jun 10, 1988
• Grant date: Apr 30, 1991
• Expiry date: Jun 10, 2008

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2201/08
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a fiber-optical sensor used for measuring the Doppler broadening of scattered laser light by the principle of quasi-elastic light scattering (QELS), the scattered light originating from particles in movement, the emergence surface (7) for the laser light at the end of a single-mode or multimode light guide (3) used as an immersion probe is inclined at an angle 0<.phi..ltoreq.15.degree., preferably 1.degree..ltoreq..phi..ltoreq.6.degree., the angle of inclination being de-fined by the optical axis (8) of the light guide (3) and the normal (9) of the emergence surface (7).