Laser-Zwei-Focus Velocimetry (L2F)

Messgrößen

  • Geschwindigkeit
  • relative Konzentration

Prinzip

The measurement principle of L2F is rather simple. The L2F-measuring device
generates two highly focused light beams in the probe volume which act as
a 'light gate' for tiny particles in the flow. The scattered light from the
particles provides two successive pulses and from the time interval between
the pulses the velocity perpendicular to the Laser beams can be derived.

The small L2F measurement volumes enable measurements close to walls -- a feature especially useful in high speed turbomachine flow investigations.
The second (stop) focus has to be rotated around the start focus into the direction of the mean flow, to enable the particles to pass both focuses.

(siehe auch Beitrag von Wolfgang Förster)

Anwendung

In Strömungen von Turbomaschinen.

Literatur / Referenzen

  • Schodl, R.: "A Laser-Two-Focus (L2F) Velocimeter for Automatic Flow Vector Measurements in the Rotating Components of Turbomachines", J. Fluid Eng., Vol. 102, pp. 412-419 (1980)
  • Kost, F.; Kapteijn, C.: "Application of Laser-Two-Focus Velocimetry to
  • Transonic Turbine Flows"; 7th International Conference on ``LASER ANEMOMETRY - ADVANCES AND APPLICATIONS'', University of Karlsruhe, Germany, September 8-11, 1997

Institut / Einrichtung

DLR-Institut für Antriebstechnik

Kontakt

Dr.rer.nat. Friedrich Kost
DLR-Institut für Antriebstechnik

Jochen Krampe
Technologiemarketing

Dr.-Ing. Alexander Born
Technologiemarketing

Dr. Frank Holtmann
Technologiemarketing

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