4.2.2 Speed sensors
Speed sensors perform measurement
by taking consecutive position
measurements at constant time
intervals, calculating the time change
ratio of position values, or
determining it directly based on
different principles.
1.
All position sensors
2.
Tachometer
3.
Hall effect sensor
4.2.3 Acceleration sensors
They are designed to perform a
measurement of acceleration or
vibration. These provide an electrical
signal according to the physical
variation they measure, in this case
the physical variation is acceleration
or vibration. It is noted here that the
speeds and accelerations measured by
the use of position sensors require
differentiations. Usually, this is not
desirable, since the noise in the
measured data, if any, will be
amplified. Alternatively, it is
recommended to use integrators to
obtain the speed from acceleration
and therefore positions. Integrators
tend to suppress noise.