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The application of sample and hold method in the processing of data obtained from a laser doppler anemometer

Stelmach J., Rzyski E.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, no 4

1291-1303

Using a laser Doppler anemometer, liquid velocity was measured in the tank in which liquid was mixed by a self-aspirating disk impeller. The energy spectrum was the basis to determine the energy dissipation rate. This rate determines the size of eddies that are formed in the vicinity of the impeller. Results obtained by sample and hold method were compared with those obtained by other methods. An increase in the sampling frequency caused a decrease in the mean liquid velocity at the measuring point.