We
use a PZT sensor mounted on a specially
designed experimental slider to detect
the contacts. The ID radius is 14.3
.. (the bottom of the image), the OD
radius is 30.7 mm (at the top of the
image), and the left to right direction
is the angle from 0 to 360 degrees.
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The
image shows all contacts "hard"
(i.e. repeatable) and transient contacts
due to intermittent hits from debris
generation. The transient contacts tend
to increase as we get really close to
the disk surface. The last map is taken
at a flying height close to the disk
"Take-Off Height" which is
related to the minimum clearance possible
on that interface.
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