Essentially,
the (complex) sensor is a frame
that employs three potentiometers.
These potentiometers measure the three angles
α, β, and γ.
Since the lengths a and b
are known by construction (manufacturing),
fundamental trigonomoetry can calculate the
actual knee angle δ as well as the
two lengths c and d.
Consequently,
the tiba displacement
Τ = Δd sin(δ)
is identical to the
change in the length d and the sin(δ)
of the knee angle δ.
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The first feasibility study
(Stabilo model kit):
very simple, flexible, almost zero cost,
but successful.
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The new sensor frame:
smaller in size,
more accurate measurements,
and ergonomic attachments.
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