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. Author manuscript; available in PMC: 2018 Oct 16.
Published in final edited form as: Integr Biol (Camb). 2017 Oct 16;9(10):800–809. doi: 10.1039/c7ib00120g

Fig. 2.

Fig. 2

Stimulus measurement and calibration. (a) Optical transmission of dye-filled touch valves is used to monitor worm channel height in the valve. (b) Worm channel ceiling deflection when control solenoid is driven by a 25 Hz square wave with an amplitude of 40 psi and a 50% duty cycle. Red lines denote pressure on. (c) Maximum deflection as a function of pressure. Points (mean ± SD) show the average of 3–5 trials. Colors show 4 different devices.