Electricity: measuring and testing – Magnetic – Displacement
Patent
1983-03-23
1987-03-24
Karlsen, Ernest F.
Electricity: measuring and testing
Magnetic
Displacement
324232, 310 905, G01B 714, G01N 2772, F16C 3500, G01R 3312
Patent
active
046528202
ABSTRACT:
A combined magnetic sensor and actuator device for applying a magnetic force to a magnetizable body and for sensing the distance between the device and the magnetizable body. The device includes a magnetizable pole piece separated from the magnetizable body by gaps. The pole piece, gaps, and magnetizable body form a magnetic circuit with the gaps preferably being the major reluctance of the circuit. Separate means are provided for generating a relatively large time-varying magnetic actuating flux in the magnetic circuit and for generating a relatively small time-varying magnetic sensing flux in the magnetic circuit. Each magnetic flux follows a flux path, such that the two flux paths have at least a portion in common. Detection means measure the relatively small magnetic flux in the magnetic circuit, and thereby measure the distance between the device and the magnetizable body.
REFERENCES:
patent: 3155937 (1964-11-01), Kinsey et al.
patent: 3316516 (1967-04-01), Condon et al.
patent: 3742409 (1973-06-01), Santis et al.
patent: 3968753 (1976-07-01), Breitling
patent: 4092867 (1978-06-01), Matzuk
Karlsen Ernest F.
North American Philips Corporation
Schechter Marc D.
Snow Walter E.
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