Angle indication device or tachometer

Details Angle indication device or tachometer Angle indication device or tachometer

G - Physics

01

P

73/53, 340/148.2

G01P 3/36 (2006.01) G01B 11/26 (2006.01) G01D 5/38 (2006.01) G01P 3/486 (2006.01)

Patent

CA 1125887

ABSTRACT A device for indicating an angle or an angular speed. The device comprises a wheel with means on both the periphery of the wheel and a station adjacent the wheel for generating an optical interference pattern as a result of movement of the wheel relative to the station. Means are provided to read the interference pattern to provide the indication of the angle or the angular speed.

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