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The optofluidic flow sensor (a)–(e) exploded view of the optofluidic flow sensor including four tailored PMMA pieces and PDMS micro Venturi; (f) schematic view of the assembled optofluidic flow sensor; (g) closed view of FP gap; (h) photograph of the fabricated optofluidic flow sensor. (The inset is the optical microscope image of on-chip micro Venturi).
