Speed measuring system utilizing magneto-optic switch actuated b

Details Speed measuring system utilizing magneto-optic switch actuated b Speed measuring system utilizing magneto-optic switch actuated b

1991-01-18

1992-10-06

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

32420713, 250225, G01P 336, G01D 534

Patent

active

051535122

ABSTRACT:
A Speed Sensor for a rotating member utilizes a magneto optic switch and a magnet mounted in the vicinity of the rotating member. Under normal conditions the magnetic field is at right angles to the axis of sensitivity of the switch thereby blocking light transmission through the switch. When a ferrous tooth on the rotating member passes the sensor, the magnetic field is distorted due to the change in reluctance caused by passage of the tooth thereby generating a magnetic field component along the switch axis of sensitivity turning the switch on and producing an output speed signal.

REFERENCES:
patent: 4843232 (1989-06-01), Emo et al.
patent: 5038102 (1991-08-01), Glasheen

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