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We are making in vivo measurements of the force response of skin at several
body sites (fingertip, wrist, forearm, and forehead) to stimulation at
various frequencies, amplitudes, and mean depths, in directions both normal
and tangential to the surface of the skin. These measurements of viscoelasticity
will be useful to the haptics community generally, providing specifications
for the development of MEMS tactile displays. See a report on the progress
of our preliminary experiments.
In this test, position (p) and force (F) were measured
as a 500 um diameter cylindrical probe indented 300 um into the fingerpad
skin at 1 mm/s (into). After 10 seconds for viscoelastic recovery
(v1), the probe provided sinusoidal displacement (sd) at
20 Hz for 10 seconds. After a second viscoelastic recovery (v2)
the probe withdrew (out) losing contact (lc) due to persisting
depression of the skin.
Work by Tim Diller, David Schloerb
 
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