Accelerometers

[Richard Brekne]

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A. Accelerometers

An accelerometer is a linear seismic transducer which produces an
electric charge proportional to the applied acceleration. A simple model
of an
accelerometer is shown in \Fig{accelerometer1}(a). A mass is supported
on a piece of piezoelectric ceramic crystal which is fastened to the
frame of
the transducer body. Piezoelectric materials have the property that if
they are compressed or sheared, they produce an electric potential
between
their extremities, and this electric potential is proportional to the
amount of compression or shear. As the frame experiences an upward
acceleration
it also experiences a displacement. Because the mass is attached to the
frame through the spring-like piezoelectric element, the resulting
displacement it experiences is of different phase and amplitude than the
displacement of the frame. This relative displacement between the frame
and mass causes the piezoelectric crystal to be compressed, giving off a
voltage proportional to the acceleration of the frame.

[Image]

--
Richard Brekne
RPT, N.P.T.F.
Bergen, Norway
mailto:rbrekne@broadpark.no
http://home.broadpark.no/~rbrekne/ricmain.html


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