laserdoppler S

Laser-Doppler Anemometry

The Laser-Doppler Anemometry (LDA) is a standard measurement technique for the determination of velocity components in fluid flows. Due to its ability to work contact-free this optical measurement technique is applied wherever the interaction between the flow and a measuring probe would yield badly interpretable results (for example a hot wire probe at very small average velocity and very high turbulence level). Furthermore LDA makes it possible to measure in flows with high thermal and mechanical loadings as they occur in combustion engines or in supersonic flows a measurement probe would not bear the loadings.

The installed system at theTrisonic Wind Tunnel features the following components:

Laser-Doppler Anemometer from DANTEC:
6 Watt Argon-Ion-LDA, 488 nm and 514.5 nm
Forward and backward scattering
Velocity determination in two directions
Diameter of the measuring volume: 150 µm (beam expansion 55X12)

Seeding:
Particle generator Palas AGF 5.0D

Traversing accuracy: 0.02 mm