Characterization techniques - Micromixers Fundamentals Design and Fabrication - page 317

FIGURE 8.14
Evaluation of time-dependent concentration fields: (a) time-averaged concentration field from the images in
Fig. 8.13 and (b) mean-square perturbation field from the images in Fig. 8.13 .
be carried out off the chip. The integration of fiber optics for on-chip measurement would be expensive
and impractical.
One of the main challenges in characterizing of micromixers is the two-dimensional nature of
fluorescent measurement with a camera/microscope system. The use of mixing index and PDF is based
on statistical evaluation of tracing fluorescent dyes. These methods are suitable for micromixers with
flat channels where the concentration distribution along the view direction is negligible. Thus, the use
of two-dimensional camera/microscope system is justified ( Fig. 8.15 (a)). For cases with concentration