LDV principle


Dr. Ulrich Müller
E-Mail: mueller@optolution.com
Telefon: +49 (0)7621 1601515

At least two laser beams are brought to intersect. At this generated measuring volume an interference fringe pattern is formed. When a particle (e.g. airbubble or seed particle) crosses this light/dark pattern, it scatters and modulates the laser light. The received frequency of the scattered light is directly proportional to the velocity of the particle in the measuring point. So it is possible to measure the punctual velocity in fluids with a high resolution and multidimensial determined.

Schematics of the Laser Doppler Velocimetry principle

Measurement of the whole velocity destribution via LDV

Recommended literature:
  • Bodo Ruck: Lasermethoden in der Strömungsmesstechnik. AT-Fachverlag, Stuttgart, 1990
  • H.-E. Albrecht, M. Borys, N. Damaschke, C. Tropea: Laser Doppler and Phase Doppler Measurement Techniques. Springer, 2003
  • H.-E. Albrecht: Laser-Doppler-Strömungsmessung, Akademie Verlag, Berlin, 1986