Optical torque sensor utilizing single polarizing area filters a

Details Optical torque sensor utilizing single polarizing area filters a Optical torque sensor utilizing single polarizing area filters a

1993-03-24

1995-02-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023113, G02F 101

Patent

active

053897803

ABSTRACT:
Torque in a rotating or stationary shaft is measured by apparatus that includes: a light source for emitting light along a light path; a light detector for receiving the light; a first polarizing filter comprising a single polarizing area and having a first axis-of-polarization attached at a first point along the shaft within the light path and between the light source and the light detector; and a second polarizing filter comprising a single polarizing area and having a second axis-of-polarization, attached at a second point along the shaft and within the light path and between the light source and the light detector. Twist in the shaft produces a change in angle between the first and the second axis-of-polarization, which change in angle produces a change in intensity of the light.

REFERENCES:
patent: 3407305 (1968-10-01), Sterry
patent: 3938890 (1976-02-01), Flavell
patent: 4637264 (1987-01-01), Takahashi et al.
patent: 4650996 (1987-03-01), Maehara et al.

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