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Receptors known as hair cells give many animals this ability to sense a wide range of stimuli, such as sound, orientation,
vibration, and flow. Previous researchers have mimicked natural hair cells by building electromechanical sensor systems
that produce an electric response due to the bending of artificial hairs. Inspired by the roles of sensory hairs in fish, this
work builds on previous research by investigating the flow dependent electrical response of a 'skin'-encapsulated
artificial hair cell in an aqueous flow. This study presents the design, fabrication, and characterization of a flow sensor
that will help close the loop between the sensing mechanisms and control strategies that aquatic organisms employ for
functions such as locomotion regulation, prey capture, and particulate capture. The system is fabricated with a durable,
artificial bilayer that forms at the interface between lipid-encased aqueous volumes contained in a flexible encapsulated
polyurethane substrate. Flow experiments are conducted by placing the bio-inspired sensor in a flow chamber and
subjecting it to pulse-like flows. Specifically, through temporal responses of the measured current and power spectral
density (PSD) analysis, our results show that the amplitude and frequency of the current response are related to the flow
over the hair. This preliminary study demonstrates that the encapsulated artificial hair cell flow sensor is capable of
sensing changes in flow through a mechanoelectrical response and that its sensing capabilities may be altered by varying
its surface morphology.
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