Optic switch and speed sensor

Details Optic switch and speed sensor Optic switch and speed sensor

G - Physics

01

N

73/54

G01N 21/84 (2006.01) G01P 3/486 (2006.01) G01P 3/487 (2006.01)

Patent

CA 1323206

ABSTRACT An electro-optic speed sensor for sensing the speed of rotation of a rotating unit which includes an optical switch transducer for sensing disturbances in a magnetic field caused by the passage of a rotating magnetic sensing wheel on the rotating member. The optical switch transducer uses a Faraday material and provides its signal by rotating the polarity of polarized light from a first source of light having a first bandwidth while allowing a second source of light having a second bandwidth to pass through unaffected. The first and second sources of light are thereafter, reflected within the transducer. The disturbances in the magnetic field generate an optical signal resulting from changes in the Faraday rotation. A photodetector receives the light from the first source to develop an operational signal corresponding to the speed of rotation of the rotating member and light from the second source to check on the continuity of the sensor system.

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