Ferromagnetic article detector with dual Hall-sensors

Details Ferromagnetic article detector with dual Hall-sensors Ferromagnetic article detector with dual Hall-sensors

1982-09-28

1985-05-21

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

324251, 338 32H, G01B 714, G01R 3306, H01L 4306

Patent

active

045189188

ABSTRACT:
Two identical integrated circuit (IC) chips are mounted at a pole of a magnet. Each IC chip includes a Hall-element followed by an amplifier. A comparator is connected to the outputs of the IC chips to produce a voltage that is directly related to the difference between the magnetic field strengths at the two IC chips that may be due to a ferromagnetic article that is closer to one IC chip than the other.

REFERENCES:
patent: 2852732 (1958-09-01), Weiss
patent: 2942177 (1960-06-01), Neumann et al.
patent: 2946755 (1960-07-01), Kuhrt
patent: 3816766 (1974-06-01), Anselmo et al.
patent: 3846697 (1974-11-01), Cila et al.
patent: 4296410 (1981-10-01), Higgs et al.

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