System and method for measuring torque using filtration of light to detect angular displacement of a pair of wheels
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United States of America Patent
Stats
-
Jan 20, 2004
Grant Date -
Jan 16, 2003
app pub date -
Jul 10, 2001
filing date -
Jul 10, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for measuring torque comprises a pair of drive shafts connected by a torsion bar, a wheel affixed to each of the drive shafts and having at least one slot cut through it, a light source positioned on the side of one of the wheels opposite the other, and a light detection device on the opposite side of the other wheel positioned to detect light from the light source which passes through the slots in both wheels. The slots are positioned in the wheels such that the light that can pass from the light source, through both wheels, and to the detector changes as the angular position of the wheels changes relative. The light detection device observes the changes in this pattern of light to produce a signal indicative of the torque on the drive shaft that is producing the observed angular displacement of the wheels.
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