The system produced by the students must be able to measure the resistance of all 10 strain sensors simultaneously, and must produce an output that corresponds to a unique combination of the strain sensors being deformed greater than or equal to the threshold (10% strain). We anticipate needing to measure resistance in the range of 100 – 1000 Ω. The hardware should be able to detect strain by an increase in electrical resistance of approximately 50% (R/R0 = 1.5), which based on preliminary measurements should occur with the application of approximately 10% tensile (stretching) strain. While ultimately the sensors would be printed directly on a polyacrylonitrile surgical glove, for the ten-week project it would be sufficient to measure the electrical response of the strain sensors mounted on strips of silicone rubber (PDMS), which will be supplied by Prof. In this experiment, the four sensors on the glove were addressed individually, the data were not communicated wirelessly, and the ability to measure the bending deformation of more than one sensor simultaneously was not demonstrated.īased on a preliminary assessment, we believe that most of the letters of ASL alphabet could be identified uniquely using approximately 10 strain sensors placed on the knuckles and wrist. The inset shows the averageĪt both positions as a function of the number of cycles. The linear actuator cycling between 0% and 20% strains. The shaded areas refer to when strains are applied by bending of
Resistance ( R/ R 0) as a function of time for the devices placed on the The second knuckle with an equivalent strain of ~20%. The peak strain occurred at the location of (b)Ĭomputational analysis of strain produced in the thin films when subjected toīending with the radius curvature of 5 mm, approximately the radius ofĬurvature of the second knuckle. Thick) and adhered to a nitrile glove using conductive copper tape. Polymer films transferred onto thin silicone rubber (PDMS) substrates (1 mm
(a) Photograph of the devices comprising conductive Images showing the characteristics of the skin-like
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