Fig. 4
From: An electrically-controlled programmable microfluidic concentration waveform generator
Different concentration waveforms of 100 mHz are generated from the microfluidic system: a) sinusoidal, b) triangle, c) sawtooth, and d) square waves, as shown in right panel. The corresponding PWM signal used for switching between the high-pressure analyte and low-pressure analyte reservoirs are shown in the left column. Note that only one period of the PWM signal is shown for clarity