Game Development Reference
In-Depth Information
Figure 7.1 Fibre optic dataglove
Tube with internal reflecting surface
Rotation of
the fingertip
Optical fibres
Translation motion
Figure 7.2 Measurement of the deformation of a finger by translation of an optical fibre
is not linear. Neither is it constant in time, especially if the glove is used by individuals
with different hand morphologies. The calibration of the glove is thus indispensable
and must be carried out at the time of every new use. The precision of the articulation
angles is of the order of 5 to 10 degrees. This glove is no longer manufactured, but
the Japanese partner of VPL, Nissho Electronics Corporation, has sold the “Super
Glove'', on a different patented principle with ten sensors, with a resolution of 0.3
and a reading speed of 0.2ms for each sensor.
Instead of detecting bending of the fibres, we can measure the relative translations
of the fibres: one of the two ends slips into a sleeve equipped with an LED diode
and its internal wall is covered with a reflecting surface. According to the articulation
angle of the finger, the end of the fibre more or less moves away from the LED, the
phototransistor at another end of the fibre obtains a light intensity proportional to
the relative movement of the fibre in the sleeve and thus to the bending angle (Wright,
1990) (Figure 7.2).
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