Optical torque sensor utilizing change in reflectance grating li

Details Optical torque sensor utilizing change in reflectance grating li Optical torque sensor utilizing change in reflectance grating li

1993-08-27

1996-02-13

Chilcot, Jr., Richard E.

Measuring and testing

Dynamometers

Responsive to torque

73800, G01L 300

Patent

active

054904307

ABSTRACT:
Torque on a rotating or stationary shaft is measured by an apparatus that includes a light source for emitting light along a light path; a reflection grating fixed to the shaft along the light path reflecting and diffracting the light; and a light detector having a plurality of light detecting elements for receiving the reflected and diffracted light. Torque on the shaft produces a change in the grating spacing of the grating, which in turn produces a change of diffraction angle of the reflected light, thereby causing a different element of the light detector to receive the light.

REFERENCES:
patent: 3688570 (1972-09-01), Burke, Jr.
patent: 3871215 (1975-03-01), Pratt, Jr. et al.
patent: 4525068 (1985-06-01), Mannava et al.
patent: 4939368 (1990-07-01), Brown
patent: 5038616 (1991-08-01), Schneider et al.

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