Magnetic sensor and circuit for detecting the edge of a target a

Details Magnetic sensor and circuit for detecting the edge of a target a Magnetic sensor and circuit for detecting the edge of a target a

1983-04-13

1986-09-02

Karlsen, Ernest F.

Electricity: measuring and testing

Magnetic

Displacement

328 5, 307354, G01B 714, H03K 553

Patent

active

046098690

ABSTRACT:
A magnetic sensor for detecting the leading edge of a ferrous target as it passes the centerline of the sensor. The magnetic sensor includes a coil output representing the rate of change of magnetic flux as the target passes the sensor. The coil output is differentiated to provide a signal having a zero crossover point corresponding to the time at which the leading edge of the target passes the centerline of the sensor. The differentiated signal is applied to a zero crossover threshold detector to provide a first pulse, the trailing edge of which corresponds to the time at which the target's leading edge is coincident with the sensor centerline. Additional means provide a second pulse whose leading edge corresponds to the time at which the leading edge of the target is coincident with the centerline of the sensor.

REFERENCES:
patent: 2973430 (1961-02-01), Pelino
patent: 3065412 (1962-11-01), Rosenthal
patent: 3714509 (1973-01-01), Coleman et al.
patent: 3787769 (1974-01-01), Parkinson
patent: 3944936 (1976-03-01), Pryor
patent: 4258324 (1981-03-01), Henrich

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