Spectral analysis with a LDA in high speed flow

Spectral analysis of velocity measurements in turbulent flow acquired with a laser Doppler anemometer (LDA) is studied. The problems of seeding and signal analysis are discussed. In order to define the limits of such an analysis, especially in the case of high speed flow, tests with simulated signals and real experiments in low and higher speeds have been carried out. The possibility of passing the Nyquist limit by using a random sampling scheme is discussed. Results obtained in the wake of a cylinder are presented