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A photochromic method for micro flow visualization has been developed to measure flow fields in micron-scale fluidic devices. The system utilizes the reconstructed images by computer-generated holograms with a UV laser to produce dye streaks in the flow of fluids. Two-dimensional flows in Hele-Shaw cells, such as the flows through a micron-scale aperture and the flow induced by a source and a sink inside a circular micro region, are visualized by using the streak lines generated by a reconstructed image with suitable circle dot patterns. The dotted circle enclosing a source is found to produce useful streak lines for visualization of source and sink flows. The corresponding potential flows are obtained which agree well in flow patterns with the experimental results.

Micro Flow Visualization using Reconstructed Image of Holograms