TY - JOUR
TI - AN OPTIMIZED LASER-DOPPLER ANEMOMETER FOR WALL BOUNDARY LAYER MEASUREMENTS
AU - Volkholz Peter
AU - Melling Adrian
AU - Fischer Martin
JN - Thermal Science
PY - 2001
VL - 5
IS - 1
SP - 33
EP - 46
PT - Article
AB - For velocity measurements in turbulent wall boundary layers with laser-Doppler anemometry (LDA), a probe volume diameter of  30 μm or less is needed in flow rigs of  typical laboratory scale to resolve steep gradients in mean velocity and turbulence quantities. It is also advantageous if signals from very small particles can be detected lo enhance the data rate, This paper describes optical solutions to optimize the LDA sensitivity and to achieve such small measuring volumes. The feasibility of a suitably designed optical system is demonstrated in a two-dimensional boundary layer flow.