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BIOPAC Hardware | Gonio-Torsio | Page 6 - 9
Updated: 11.21.2013
3.
The single axis torsiometers permit the
measurement of rotation in one plane,
e.g. forearm pronation/supination.
Axial rotation of one endblock relative
to the other along axis Z-Z is measured
from the gray plug.
If the torsiometer is bent in planes X-X
or Y-Y, the output remains constant.
All torsiometers function in the same
way, and difference only in size.
WARNING!
Torsiometers measure rotations about ZZ in the range ± 90°.
Exceeding the range may result in a reduction of the life of the
unit or failure.
The working mechanism is the same for
all three types of sensors. There is a
composite wire between the two
endblocks that has a series of strain
inside the protective spring gauges
mounted around the circumference. As
the angle between the two ends changes,
the change in strain along the length of
the wire is measured and this is equated
to an angle. The design is such that only
angular displacements are measured.
If the two ends move linearly relative to
each other, within the limits of telescopic
endblock, without changing the relative
angles between them, then the outputs
remain constant.
The amount of strain induced in the
gauges is inversely proportional to the
bend radius that the beam is bent around.
If the stated minimum permissible bend
radius is exceeded then unit life will be
reduced or, in severe cases, failure may
result.
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