Development and validation of digital holographic particle velocity measurement system for rotational flows

A digital holographic particle velocity measurement system was developed, validated, and applied to the measurement of rotational flows. With the developed system, the 3-Dimensional information of the flow field can be obtained. A validation experiment for the digital holographic particle velocity measurement system by measuring the velocities of glass beads on a rotating disk was conducted to verify the accuracy and feasibility of the system. Uncertainty analysis was performed to identify the sources of all relevant errors and to evaluate their magnitudes. The measurement results of the velocities of glass beads obtained with digital holographic system were compared reasonably well with the known values within acceptable range of errors. Using the developed digital particle holographic system, a rotational flow field was measured and the distribution of 3-D velocities was visualized. The feasibility of this system was verified by the measurement results which were in good agreement with the theoretical predictions.