This set of measurements reveals the spatial
structure of the wavy Taylor vortex flow instability. Since wavy Taylor vortex flow is periodic both in space and time,
we cannot average many consecutive measurements to minimize random uncertainties as with a steady-state phenomenon.
What we can do however is use the peak in the power spectrum to accurately determine the fundamental frequency of the
waviness and phase average measurements from consecutive periods of the wave. The image is an example of this averaging
covering an entire temporal period of the waviness and three spatial periods. The rotating inner cylinder is at the top
of the figure and the stationary outer cylinder is at the bottom of the figure. The red asterisks show the present
locations of the vortex centers while the white pluses show the past locations of the vortex centers.