NDLI: Spectral Analysis and Characterization of a Membrane-Based Artificial Hair Cell Sensor

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Sarlo, Rodrigo Leo, Donald Tarazaga, Pablo
Copyright Year	2014
Abstract	A fully hydrogel-supported, artificial hair cell (AHC) sensor based on bilayer membrane mechanotransduction is designed with sensitivity and versatility in mind. Thanks to fabrication improvements from previous generations, the sensor demonstrates peak current outputs in the nanoamp range and can clearly measure inputs as high as 2k Hz. Characterization of the AHC response to base excitation and air pulses show that membrane current oscillates with the first three bending modes of the hair. Output magnitudes reflect of vibrations near the base of the hair. A 2 DOF Rayleigh-Ritz approximation of the system dynamics yields estimates of 19 N/m and 0.0011 Nm/rad for the equivalent linear and torsional stiffness of the hair’s hydrogel base, although double modes suggest non-symmetry in the gel’s linear stiffness. The sensor output scales linearly with applied voltage (1.79 pA/V), avoiding a higher-order dependence on electrowetting effects. The free vibration amplitude of the sensor also increases in a linear fashion with applied airflow pressure (18.4 pA/psi). Based on these sensitivity characteristics, an array sensing strategy for these sensors is proposed.
Sponsorship	Aerospace Division
File Format	PDF
ISBN	9780791846155
DOI	10.1115/SMASIS2014-7578
Volume Number	Volume 2: Mechanics and Behavior of Active Materials; Integrated System Design and Implementation; Bioinspired Smart Materials and Systems; Energy Harvesting
Conference Proceedings	ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
Language	English
Publisher Date	2014-09-08
Publisher Place	Newport, Rhode Island, USA
Access Restriction	Subscribed
Subject Keyword	Spectroscopy Membranes Emission spectroscopy Approximation System dynamics Vibration Hydrogels Pressure Air flow Free vibrations Stiffness Sensors Excitation Manufacturing
Content Type	Text
Resource Type	Article

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