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Flexible-foam-based capacitive sensor arrays for object detection at low cost
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View: Figures


Image of FIG. 1.
FIG. 1.

(Left) Illustration of strain vs stress of polyolefin packaging foam in cross section. The graph reveals a nearly linear relationship between strain and stress at low stress levels of up to ; nonlinearities and hysteresis occur only at higher stress levels. (right) Small signal elastic modulus of the foam vs pressure when pressure is increased up to at . Three distinct regions characterize the elastic behavior of the foam: linear (I) and nonlinear elasticity regions with softening (II) and densification (III) of the foam.

Image of FIG. 2.
FIG. 2.

The cross-sectional electron microscope scan of polyolefin packaging foam shows few large and anisotropically shaped voids across the thickness of the foam.

Image of FIG. 3.
FIG. 3.

(a) The change in capacitance of a single sensor element correlates with the load. (b) Signal and noise level for a sensor element, which is periodically exposed to a load per area of . (c) Flexible pressure-sensitive skinlike electronic surface with 96 capacitive sensor elements for the detection of shelf stocks (loaded and unloaded sensors).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Flexible-foam-based capacitive sensor arrays for object detection at low cost