Speed sensor utilizing magneto-optics switch actuated by magneti

Details Speed sensor utilizing magneto-optics switch actuated by magneti Speed sensor utilizing magneto-optics switch actuated by magneti

1988-12-27

1991-08-06

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

32420725, 324226, 250225, G01P 336, G01D 534

Patent

active

050381024

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: 4818080 (1981-04-01), Glasheen
patent: 4843232 (1989-06-01), Emo et al.

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