Velocity measurement using Laser Doppler anemometry
Liu, Min-hsiang (Graduate student of mechanical engineering)
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In order to obtain the result of the signal quality in Laser Doppler Anemometry, a water-flow pipe system is designed and installed. The plexiglass pipe is used in the test system. An LDV system is employed in data collection, and Chauvenet’s criterion is used in data analysis. The signal quality in LDV can be represented by signal-to-noise ratio, pedestal height and Doppler shift. The signal quality of polystyrene particles of various sizes is measured in a water-flow pipe facility using a one-component two-beam laser Doppler anemometer with counter processor, frequency shifter and IBM-AT Computer, which measures the axial mean velocity component in the flow system. Results are analyzed for predicting the relationship between particle type, size and signal quality.