Cahill Indentation Probe
Joseph H. Demers
Advisor: Dave Senffner
An indentation probe is used to find the rigidity of the cartilage behind
the kneecap. This measurement is taken to determine the necessity of knee
surgery. The electronics of the probe take the shear applied to a load
cell and convert this to a numerical reading on a digital display to be
read by the doctor. A strain gage is the transducer used to convert the
shear to an electrical signal. This signal is then amplified by an instrumentation
amplifier to be fed to a microcontroller after A/D conversion. A microcontroller
is used for both scaling of data and storage of multiple readings for the
doctor using the instrument.
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